Method and apparatus to determine constant speed torque on an engine

• US 4,630,508 A
• Filed: 03/16/1984
• Issued: 12/23/1986
• Est. Priority Date: 03/28/1983
• Status: Expired due to Term

• Current Assignee: TRN Business Trust
• Original Assignee: Wabco Westinghouse Fahrzeugbremsen GmbH
• Inventors: Klatt, Alfred
• Primary Examiner(s): Braun, Leslie A.
• Assistant Examiner(s): Diehl, Dwight G.
• Application Number:
  US06/590,247
• Time in Patent Office: 1,012 Days
• Field of Search: 74/843, 74/861, 74/862, 74/865, 74/866, 364/424.1
• US Class Current: 701/54
• CPC Class Codes: B60W 10/04 including control of propulsion units
• CPC Class Codes: B60W 10/11 Stepped gearings
• CPC Class Codes: B60W 30/18 Propelling the vehicle
• CPC Class Codes: B60W 30/1819 Propulsion control with control means using analogue circuits, relays or mechanical links
• CPC Class Codes: F16H 2059/142 of driving resistance calculated from weight, slope, or the like
• CPC Class Codes: F16H 2061/0015 Transmission control for optimising fuel consumptions
• CPC Class Codes: F16H 2061/161 by checking feasibility of shifts, i.e. determine if requested shift can be successfully completed and post shift values are in an acceptable range
• CPC Class Codes: F16H 59/14 Inputs being a function of torque or torque demand
• CPC Class Codes: F16H 59/48 Inputs being a function of acceleration
• CPC Class Codes: F16H 59/52 dependent on the weight of the machine, e.g. change in weight resulting from passengers boarding a bus
• CPC Class Codes: F16H 61/0213 characterised by the method for generating shift signals
• CPC Class Codes: Y10S 477/90 Control signal is vehicle weight

Abstract

An apparatus for generating signal values that are representative of the vehicle engine'"'"'s momentary drive torque, the weight of the vehicle, and the acceleration of the vehicle. The constant speed drive torque is then determined in a computing device which subtracts the product of the signal value of the vehicle weight and the signal value of the vehicle acceleration from the signal value for the momentary drive torque and a signal value that is representative of the constant speed drive torque of the vehicle engine is generated. This constant speed drive torque signal value is applied in the method for governing a vehicle control device.

Claims

1. An apparatus to determine the constant speed drive torque of a vehicle engine, said apparatus comprising:

(a) a first means for providing a signal having a value that is representative of a momentary drive torque of such vehicle engine;

(b) a second means for providing a signal having a value that is representative of the weight of such vehicle connected to receive said signal value directly from said first means;

(c) a third means for providing a signal having a value that is representative of the acceleration of such vehcile at a preselected time and under preselected driving conditions connected to transmit said signal value directly to said second means;

(d) a fourth means for generating a signal having a value that is representative of a constant speed drive torque of such vehicle engine, said signal generating fourth means connected to receive said signal value directly from said first means and said signal value directly from said second means and said signal value directly from said third means, said signal generating fourth means determining said constant speed drive torque by subtracting the product of said weight representative signal value and said acceleration representative signal value from the value of said momentary drive torque representative signal and generating said signal value that is representative of said constant speed drive torque; and

(e) a fifth means connected to receive said signal value directly from said fourth means for controlling such vehicle in response to said constant speed drive torque representative signal.

2. An apparatus, according to claim 1, wherein said first means comprises:

(a) a means for providing a signal having a value that is representative of the rotational speed of such vehicle engine'"'"'s drive shaft;

(b) a means for providing a signal having a value that is representative of the amount of fuel being supplied to such vehicle engine;

(c) a means for storing a plurality of functions, each of said functions having a unique value representative of said momentary drive torque of such vehicle enging with respect to such rotational speed of such drive shaft of such vehicle'"'"'s engine and such amount of fuel being supplied to such vehicle engine, said means for storing said plurality of functions electrically connected directly to said means for providing said signal value representative of such rotational speed of such drive shaft of such vehicle engine and directly to said means for providing said signal value representative of such amount of fuel being supplied to such vehicle engine; and

(d) a signal generating means for providing said signal having a value that is representative of said momentary drive torque of such vehicle engine directly to said second means and directly to said fourth means, said signal generating means generating said signal value by comparing said functions with said signal value representative of such rotational speed of such drive shaft and said signal value representative of such amount of fuel being supplied to such vehicle engine.

3. An apparatus, according to claim 1, wherein such vehicle'"'"'s engine is an internal combustion engine and the amount of fuel supplied to said engine is manually controllable by a driver of such vehicle.

4. An apparatus to determine the constant speed drvie torque of a vehicle engine, said apparatus comprising:

(a) a first means for providing a signal having a value that is representative of the weight of said vehicle;

(b) a second means for providing a signal having a value that is representative of the acceleration of such vehicle at a preselected time and under preselected driving conditions;

(c) a third means for providing a signal having a value that is representative of the rotational speed of such vehicle engine'"'"'s drive shaft;

(d) a fourth means for providing a signal having a value that is representative of the amount of fuel being supplied to such vehicle engine;

(e) a fifth means for storing a plurality of functions, each of said functions having a unique value representative of a momentary drive torque of such vehicle engine with respect to said rotational speed of such drive shaft of such vehicle'"'"'s engine and such amount of fuel being supplied to such vehicle engine, said means for storing said plurality of functions electrically connected to said third means for providing said signal value representative of said rotational speed of such drive shaft of such vehicle engine and to said fourth means for providing said signal value representative of such amount of fuel being supplied to such vehicle engine; and

(f) a signal generating sixth means for providing a signal having a value that is representative of said momentary drive torque of such vehicle engine to said second means, said signal generating sixth means generating said signal value by comparing said functions with said signal value representative of said rotational speed of such drive shaft an said signal value representative of such amount of fuel being supplied to such vehicle engine;

(g) a seventh means for generating a signal having a value that is representative of a constant speed drive torque of such vehicle engine, said signal generating seventh means connected to receive said signal value directly from said sixth means and said signal value directly from said first means and said signal value directly from said second means, said signal generating seventh means determining said constant speed drive torque by subtracting the product of said weight representative signal value and said acceleration representative signal value from the value of said momentary drive torque representative signal and generating said signal value that is representative of said constant speed drive torque; and

(h) an eighth means for controlling such vehicle in response to said constant speed drive torque representative signal, said eighth means connected in a manner to receive said constant speed drive torque representative signal value directly from said seventh means.

5. An apparatus, according to claim 4, wherein said second means comprises:

(a) a means for calculating said weight of such vehicle electrically connected to said first means to receive at least one signal value directly therefrom that is representative of said momentary drive torque of such vehicle'"'"'s engine and electrically connected to said third means to receive directly therefrom at least two signal values that are representative of said acceleration of such vehicle at said preselected time and under said preselected driving conditions, said calculation of said weight of such vehicle is performed according to the relationship;

##EQU3## (b) a means for providing a signal directly to said calculation means that is representative of said preselected time and when said preselected driving conditions are present in such vehicle; and

(c) a signal generating means for providing said signal value representative of said weight of such vehicle as determined by the solution to said relationship directly to said fourth means, said signal generating means being positioned within said calculating means.

6. An apparatus, according to claim 5, wherein said calculating means further comprises a means for establishing the formation of the ratio of said momentary drive torque of such drive shaft to the differential of said at least two signal values representative of said acceleration of such vehicle at said preselected time and under said preselected driving conditions.

7. An apparatus, according to claim 6, wherein said means for providing said signal to said calculating means representative of said preselected time and when said preselected driving conditions are present further comprises:

(a) a clutch connected on one side thereof to such drive shaft of such vehicle engine and on the opposed side thereof to a shaft which is connected to such vehicle'"'"'s transmission;

(b) a control means for engaging and disengaging said clutch in response to a first control signal, said control means being connected to receive said first control signal directly from said fifth means; and

(c) a means for supplying said first control signal directly from said fifth means to said calculating means so that at least one of said at least two signal values that are representative of said acceleration of such vehicle will be taken with said clutch in a disengaged condition and the other of said at least two signals will be taken at a time when said clutch is engaged.

8. An apparatus, according to claim 5, wherein said second means further comprises:

(a) a means for forming an average value for said signal value representative of said weight of such vehicle from a plurality of previously determined different weight values; and

(b) means for supplying said average value of said weight in said signal value that is representative of said weight of such vehicle.

9. An apparatus, according to claim 5;

wherein said second means further comprises a means for analyzing weight values and utilizing only those weight values that do not exceed a specified deviation from a specified weight value.

10. An apparatus, according to claim 9, wherein said specified weight value is a previously determined weight value for said weight of such vehicle.

11. An apparatus, according to claim 9, wherein said second means further comprises a means for providing a signal value representative of a fixed specified weight value when said signal to said calculating means representative of said preselected time and said preselected driving conditions is outside a preselected range of values.

12. An apparatus, according to claim 4, wherein said third means comprises:

(a) a speed sensing means positioned on such vehicle for determining the rotational speed of at least one driven wheel of such vehicle and for generating a signal value representative of said rotational speed; and

(b) a differentiating means connected to receive said signal value from said speed sensing means for determining an acceleration value derived from the time slope of said rotational speed of said driven wheel, said differentiating means connected to supply said differentiated signal value representative of such vehicle'"'"'s acceleration directly to said second means, and directly to said fourth means, and directly to said fifth means.

13. An apparatus, according to claim 12, wherein said speed sensing means is a tachometer.

14. An apparatus, according to claim 4, wherein said fourth means further comprises a calculating means for said determining of said constant speed drive torque according to the relationship:

space="preserve" listing-type="equation">M.sub.stat ∝

M.sub.A -G·

f (s)

wherein,

M_stat =constant speed drive torque,

M_A =momentary drive force,

s=vehicle acceleration, and

G=vehicle weight.

15. An apparatus, according to claim 14, wherein said calculating means determines a value for said M_stat continuously.

16. An apparatus, according to claim 14, wherein said calculating means further comprises a means for calculating additional values according to the relationship:

space="preserve" listing-type="equation">M'"'"'.sub.stat =M.sub.stat ·

i/i'"'"'

wherein,

M_stat =constant speed drive torque of engine in the engaged gear position,

M'"'"'_stat =constant speed drive torque of engine in another gear position,

i=gear ratio of said engaged gear position, and

i'"'"'=gear ratio of said other gear position.

17. An apparatus, according to claim 4, wherein said fifth means controls gear changes in a transmission control system of such vehicle.

18. An apparatus, according to claim 4, wherein said fifth means further comprises a means for requesting said constant speed drive torque representative signal value directly connected to said fourth means.

19. An apparatus, according to claim 4, wherein said fifth means further comprises at least one comparator device therein for comparing said constant speed drive torque representative signal value with a predetermined value.

20. A control system which operates in conjunction with a motor vehicle transmission, said control system comprising:

(a) a first means for determining a momentary drive torque of such vehicle'"'"'s engine and for generating a signal having a value that is representative of said momentary drive torque;

(b) a second means for determining the acceleration of such vehicle, said determination occurring at a preselected time and under preselected driving conditions, said second means generating a signal having a value that is representative of the acceleration of such vehicle;

(c) a third means for determining the weight of such vehicle connected to receive at least one signal value directly from said first means and at least two signal values directly from said second means, said at least one signal value received from said first means and said at least two signal values received from said second means being transmitted to said third means for calculating said weight of such vehicle, said third means generating a signal having a value that is representative of said calculated weight;

(d) a fourth means for generating a signal having a value that is representative of a constant speed drive torque of such vehicle engine'"'"'s drive shaft, said signal generating fourth means being connected to receive said signal value directly from said first means and said signal value directly from said second means and said signal value directly from said third means, said signal generating fourth means determining said constant speed drive torque by subtracting the product of said weight representative signal value and said acceleration representative signal value from the value of said momentary drive torque representative signal and generating said signal having a value that is representative of said constant speed drive torque;

(e) a transmission control means for generating a signal initiating a gear change, said transmission control means equipped to receive said signal value directly from said second means representative of said acceleration and said signal value directly from said fourth means representative of said momentary drive torque;

(f) a first comparator comparing said constant speed drive torque signal value with a plurality of values with respect to the engaged gear;

(g) a second comparator comparing said constant speed drive torque signal value with a plurality of values with respect to other gears; and

(h) output from said first comparator and said second comparator connected to said transmission control to determine an operating gear.

21. A control system, according to claim 20, wherein said fourth means further comprises a calculating means for said determining of said constant speed drive torque according to the relationship:

space="preserve" listing-type="equation">M.sub.stat ∝

M.sub.A -G·

f (s)

wherein,

M_stat =constant speed drive torque,

M_A =momentary drive force,

s=vehicle acceleration, and

G=vehicle weight.

22. A control system, according to claim 21, wherein said calculating means determines a value for said M_stat continuously.

23. A control system, according to claim 21, wherein said calculating means further comprises a means for calculating additional values according to the relationship:

space="preserve" listing-type="equation">M'"'"'.sub.stat =M.sub.stat ·

i/i'"'"'

wherein,

M_stat =constant speed drive torque of engine in the engaged gear position,

M'"'"'_stat =constant speed drive torque of engine in another gear position,

i=gear ratio of said engaged gear position, and

i'"'"'=gear ratio of said other gear position.

24. A control system, according to claim 23, wherein said transmission control means further comprises a blocking means for preventing the shifting into another gear if said second comparator indicates that said M'"'"'_stat of such other gear is less than said M_stat of such engaged gear.

25. A control system, according to claim 24, wherein said transmission control means shifts into a higher gear if said first comparator indicates that M_stat of such higher gear is greater than the M_stat of the engaged gear.

26. A motor vehicle transmission control system, said control system comprising:

(a) a first means for determining a momentary drive torque of such vehicle'"'"'s engine and for generating a signal having a value that is representative of said momentary drive torque;

(b) a second means for determining the acceleration of such vehicle, said determination occurring at a preselected time and under preselected driving conditions, said second means generating a signal having a value that is representative of said acceleration of such vehicle;

(c) a third means for determining the weight of such vehicle connected to receive at least one signal value directly from said first means and at least two signal values directly from said second means, said at least one signal value received from said first means and said at least two signal values received from said second means being transmitted to said third means for calculating said weight of such vehicle, said third means generating a signal having a value that is representative of said calculated weight;

(d) a fourth means for generating a signal having a value that is representative of said constant speed drive torque, said signal generating fourth means being connected to receive said signal value directly from said first means and said signal value directly from said second means and said signal value directly from said third means, said signal generating fourth means determining said constant speed drive torque by subtracting the product of said weight representative signal value and said acceleration representative signal value from the value of said momentary drive torque representative signal and generating said signal value that is representative of said constant speed drive torque;

(e) a transmission control means for generating a signal for effectuating a required gear change connected to such vehicle'"'"'s transmission, said transmission control means is equipped to receive said signal value directly from said second means representative of said acceleration and to receive said signal value directly from said fourth means that is representative of said momentary drive torque;

(f) new gear selection means in said transmission control means and connected to receive said signal value directly from said second means representative of said acceleration and connected to said means for generating a signal for effectuating said required gear change;

(g) a test means for determining if said momentary drive torque of such vehicle engine is sufficient to maintain operation of such vehicle at substantially the same speed in said new gear, said test means connected to receive said signal value directly from said fourth means representative of said momentary drive torque and to said new gear selection means; and

(h) a means for blocking said shifting into said new gear when said test means indicates said momentary drive torque of said vehicle engine, when transmitted through said new gear, is insufficient to maintain substantially the same speed, said blocking means connected to said test means and to said means for generating said signal for effectuating said required gear change.

27. A motor vehicle transmission control system, according to claim 26, wherein said test means is a comparator.

28. A motor vehicle transmission control system, according to claim 26, wherein said fourth means further comprises a calculating means for said determining of said constant speed drive torque according to the relationship:

space="preserve" listing-type="equation">M.sub.stat ∝

M.sub.A -G·

f (s)

wherein,

M_stat =constant speed drive torque,

M_A =momentary drive force,

s=vehicle acceleration, and

G=vehicle weight.

29. A motor vehicle, according to claim 28, wherein said calculating means further comprises a means for calculating additional values according to the relationship:

space="preserve" listing-type="equation">M'"'"'.sub.stat =M.sub.stat ·

i/i'"'"'

wherein,

M_stat =constant speed drive torque of engine in the engaged gear position,

M'"'"'_stat =constant speed drive torque of engine in another gear position,

i=gear ratio of said engaged gear position, and

i'"'"'=gear ratio of said other gear position.

30. A motor vehicle transmission control system, according to claim 26, wherein said transmission control means further comprises a means for storing a plurality of value ranges for said momentary drive torques for each of said gears in such vehicle'"'"'s transmission, said means for storing said momentary drive torque value ranges is connected to said test means.

31. A motor vehicle transmission control system, according to claim 26, wherein said control system further includes a means for determining a maximum momentary drive torque from a rotational speed limit of the drive shaft of such vehicle'"'"'s engine.

32. A motor vehicle transmission control system, according to claim 31, wherein said means for determining said maximum momentary drive torque further comprises integral therewith a storage means for a plurality of RPM value ranges at constant momentary drive torque values.

33. An energy efficient motor vehicle transmission control system, said control system comprising:

(a) a first means for determining a momentary drive torque of such vehicle'"'"'s engine and for generating a signal having a value that is representative of said momentary drive torque;

(b) a second means for determining the acceleration of such vehicle, said determination occurring at a preselected time and under preselected driving conditions, said second means generating a signal having a valve that is representative of said acceleration of such vehicle;

(c) a third means for determining the weight of such vehicle connected to receive at least one signal value directly from said first means and at least two signal values directly from said second means, said at least one signal value received from said first means and said at least two signal values received from said second means being transmitted to said third means for calculating said weight of such vehicle, said third means generating a signal having a value that is representative of said calculated weight;

(d) a fourth means for generating a signal having a value that is representative of said constant speed drive torque, said signal generating fourth means being connected to receive said signal value directly from said first means and said signal value directly from said second means and said signal value directly from said third means, said signal generating fourth means determining said constant speed drive torque by subtracting the product of said weight representative signal value and said accleration representative signal value from the value of said momentary drive torque representative signal and generating a signal having a value that is representative of said constant speed drive torque;

(e) a transmission control means for generating a signal for making a required gear change connected to such vehicle'"'"'s transmission, said transmission control means is equipped to receive said signal value directly from said second means representative of said acceleration and said signal value directly from said fourth means that is representative of said constant speed drive torque;

(f) means for comparing said constant speed drive torque signal value with a plurality of predetermined economical constant speed drive torque value limits for various gears; and

(g) said comparing means including a means for generating a signal when a gear shift will be outside said predetermined economical constant speed drive torque value limits.

34. An energy efficient transmission control system, according to claim 33, wherein said first means comprises:

(a) a means for providing a signal having a value that is representative of the rotational speed of such vehicle engine'"'"'s drive shaft;

(b) a means for providing a signal having a value that is representative of the amount of fuel being supplied to such vehicle engine;

(c) a means for storing a plurality of functions, each to said functions having a unique value representative of said momentary drive torque of such vehicle'"'"'s engine with respect to such rotational speed of said drive shaft of such vehicle'"'"'s engine and such amount of fuel being supplied to such vehicle'"'"'s engine, said means for storing said plurality of functions electrically connected to said means for providing said signal value representative of such rotational speed of such drive shaft of such vehicle engine and to said means for providing said signal value representative of such amount of fuel being supplied to such vehicle engine; and

(d) a signal generating means for providing said signal value that is representative of said momentary drive torque of such vehicle engine directly to said second means and directly to said fourth means, said signal generating means generating said signal value by comparing said functions with said signal value representative of such rotational speed of such drive shaft and said signal value representative of such amount of fuel being supplied to such vehicle engine.

35. An energy efficient transmission control system, according to claim 33, wherein said third means comprises:

(a) a means for calculating said weight of such vehicle electrically connected to said first means to receive at least one signal value directly therefrom that is representative of said momentary drive torque of such vehicle'"'"'s engine and electrically connected to said second means to receive directly therefrom at least two signal values that are representative of said acceleration of such vehicle at said preselected time and under said preselected driving conditions, said calculation of said weight of such vehicle is carried out according to the relationship;

##EQU4## (b) a means for providing a signal to said calculation means that is representative of said preselected time when said preselected driving conditions are present in such vehicle; and

(c) a signal generating means for providing said signal value representative of said weight of such vehicle as determined by the solution to said relationship, said signal generating means supplying said weight signal value directly to said fourth means, said signal generating means being positioned within said calculating means.

36. An energy efficient transmission control system, according to claim 35, wherein said means for providing said signal to said calculating means that is representative of said preselected time and when said predetermined driving conditions are present in such vehicle further comprises:

(a) a clutch connected on one side thereof to such drive shaft of such vehicle engine and on the opposed side thereof to a shaft which is connected to such vehicle'"'"'s transmission;

(b) a control means for engaging and disengaging said clutch in response to a first control signal, said control means being connected to receive said first control signal directly from said transmission control means; and

(c) a means for supplying said first control signal from said transmission control means directly to said calculating means so that at least one of said at least two signal values that are representative of said acceleration of such vehicle will be taken when said clutch is in a disengaged condition and the other of said at least two signal values will be taken at a time when said clutch is engaged.

37. An energy efficient transmission control system, according to claim 33, wherein said fourth means further comprises a calculating means for said determining of said constant speed drive torque according to the relationship:

space="preserve" listing-type="equation">M.sub.stat ∝

M.sub.A -G·

f (s)

wherein,

M_stat =constant speed drive torque,

M_A =momentary drive force,

s=vehicle acceleration, and

G=vehicle weight.

38. An energy efficient transmission control system, according to claim 37, wherein said calculating means further comprises a means for calculating additional values according to the relationship:

space="preserve" listing-type="equation">M'"'"'.sub.stat =M.sub.stat ·

i/i'"'"'

wherein,

M_stat =constant speed drive torque of engine in the engaged gear position,

M'"'"'_stat =constant speed drive torque of engine in another gear position,

i=gear ratio of said engaged gear position, and

i'"'"'=gear ratio of said other gear position.

39. An energy efficient transmission control system, according to claim 33, wherein said comparing means further comprises a means for storing and for determining the boundry of said plurality of predetermined economical constant speed drive torque value limits.

40. An energy efficient transmission control system, according to claim 33, wherein said control system further comprises a second comparator having a second plurality of established economical constant speed drive torque value limits, said second comparator including a signal generating means.

41. An energy efficient transmission control system, according to claim 40, wherein upshifting of said transmission is controlled by said signal generating means in one of said two comparators and downshifting of said transmission is controlled by said signal generating means in the other of said two comparator means.

42. A transmission control system of a motor vehicle, said control system comprising:

(a) a first means for determining a momentary drive torque of such vehicle'"'"'s engine and for generating a signal having a value that is representative of said momentary drive torque;

(b) a second means for determining the acceleration of such vehicle, said determination occurring at a preselected time and under preselected driving conditions, said second means generating a signal having a value that is representative of said acceleration of such vehicle;

(c) a third means for determining the weight of such vehicle connected to receive at least one signal value directly from said first means and at least two signal value directly from said second means, said at least one signal value received from said first means and said at least two signal values received from said second means being transmitted to said third means for calculating said weight of such vehicle, said third means generating a signal having a value that is representative of said calculated weight;

(d) a fourth means for generating a signal having a value that is representative of said constant speed drive torque, said signal generating fourth means being connected to receive said signal value directly from said first means and said signal value directly from said second means and said signal value directly from said third means, said signal generating fourth means determining said constant speed drive torque by subtracting the product of said weight representation signal value and said acceleration representation signal value from the value of said momentary drive torque representative signal and generating said signal value that is representative of said constant speed drive torque;

(e) a transmission control means for generating a signal for effectuating a gear change is connected to such vehicle'"'"'s transmission, said transmission control means is equipped to receive said signal value directly from said second means representative of said acceleration and said signal value directly from said fourth means representative of said constant speed drive torque; and

(f) a comparator means for comparing said signal value representative of said constant speed drive torque with at least one optimum torque value and controlling gear shift changes in response to said comparison, said comparing means includes a signal generating means connected to said transmission control means for generating said signal for effectuating said gear change.

43. A transmission control system, according to claim 42, wherein said first means further comprises:

(a) a means for providing a signal value that is representative of the rotational speed of such vehicle engine'"'"'s drive shaft;

(b) a means for providing a signal value that is representative of the amount of fuel being supplied to such vehicle'"'"'s engine;

(c) a means for storing a plurality of functions, each of said functions having a unique value representative of said momentary drive torque of such vehicle engine with respect to such rotational speed of such drive shaft of such vehicle'"'"'s engine and such amount of fuel being supplied to such vehicle engine, said means for storing said plurality of functions electrically connected to said means for providing said signal value representative of such rotational speed of such drive shaft and to said means for providing said signal value representative of such amount of fuel being supplied; and

(d) a signal generating means for providing said signal value that is representative of said momentary drive torque of such vehicle engine directly to said second means and directly to said fourth means, said signal generating means generating said signal value by comparing said functions with said signal value representative of such rotational speed of such drive shaft and said signal value representative of such amount of fuel being supplied.

44. A transmission control system, according to claim 42, wherein said third means further comprises:

(a) a means for calculating said weight of such vehicle electrically connected to said first means to receive at least one signal value directly therefrom that is representative of said momentary drive torque of such vehicle'"'"'s engine and electrically connected to said second means to receive directly therefrom at least two signal values that are representative of said acceleration of such vehicle at said preselected time and under said preselected driving conditions, said calculation of said weight of such vehicle is performed according to the relationship;

##EQU5## (b) a means for providing a signal directly to said calculation means that is representative of said preselected time and when such vehicle'"'"'s engine is in a driving condition and when such vehicle'"'"'s engine is in a nondriving condition; and

(c) a signal generating means for providing said signal value representative of said weight of such vehicle as determined by the solution to said relationship, said signal generating means supplying said weight signal value directly to said fourth means.

45. A transmission control system, according to claim 42, wherein said fourth means further comprises a calculating means for said determining of said constant speed drive torque according to the relationship:

space="preserve" listing-type="equation">M.sub.stat ∝

M.sub.A -G·

f(s )

wherein,

M_stat =constant speed drive torque,

M_A =momentary drive force,

s=vehicle acceleration, and

G=vehicle weight.

46. A transmission control system, according to claim 45, wherein said calculating means further comprises a means for calculating additional values according to the relationship:

space="preserve" listing-type="equation">M'"'"'.sub.stat =M.sub.stat ·

i/i'"'"'

wherein,

M_stat =constant speed drive torque of engine in the engaged gear position,

M'"'"'_stat =constant speed drive torque of engine in another gear position,

i=gear ratio of said engaged gear position, and

i'"'"'=gear ratio of said other gear position.

47. A transmission control system, according to claim 42, wherein said comparator means further comprises a plurality of optimum constant speed drive torque values corresponding to different gear positions available in said transmission stored in said comparator means.

48. A transmission control system, according to claim 42, wherein said transmission control means further comprises a blocking means for preventing the shifting of said gears into a new position when a differential is established by said comparator means between said constant speed drive torque value prevailing in the engaged gear position and said optimum constant speed drive torque value for said new gear position is outside a predetermined range of values.

49. A method of determining the constant speed drive torque of an engine in a vehicle, and controlling gear changes in a transmission control system of such vehicle in response to said constant speed drive torque determination, said method comprising the steps of:

(a) determining a momentary drive torque of such vehicle engine;

(b) generating at least one signal value that is representative of said momentary drive torque determined in step (a);

(c) transmitting said signal value generated in step (b) directly to an apparatus for computing the weight of such vehicle and directly to an apparatus for determining said constant speed drive torque of said engine;

(d) determining the weight of such vehicle;

(e) generating at least one signal value that is representative of said weight of such vehicle determined in step (d);

(f) transmitting said signal value generated in step (e) directly to said apparatus for determining said constant speed drive torque of said engine;

(g) determining the acceleration of such vehicle;

(h) generating a signal value that is representative of said acceleration determining the step (g) at a preselected time and under a preselected driving condition of such vehicle;

(i) transmitting said signal value generated in step (h) directly to said apparatus for computing said weight of such vehicle and directly to said apparatus for determining said constant speed drive torque of said engine and directly to said transmission control system;

(j) determining a constant speed drive torque from said signals transmitted in steps (c,f and i) by subtracting the product of said signal value in step (f) and said signal value in step (i) from said signal value in step (c);

(k) generating a signal value that is representative of said constant speed drive torque of such vehicle engine;

(l) transmitting said signal value generated in step (k) directly to said transmission control system; and

(m) governing such gear changes in such vehicle in response to said constant speed drive torque signal value transmitted in step (l).

50. A method of controlling a vehicle in response to a constant speed drive torque signal, according to claim 49, wherein said determination of said momentary drive torque of such vehicle engine comprises the steps of:

(a) determining the amount of fuel being supplied to such vehicle engine;

(b) generating at least one signal that is representative of said amount of fuel being supplied as determined in step (a);

(c) transmitting said signal value generated in step (b) to a memory storage and comparator device;

(d) determining the rotational speed of the drive shaft of such vehicle engine;

(e) generating at least one signal that is representative of rotational speed of said drive shaft determined in step (c);

(f) transmitting said signal value generated in step (e) to said memory storage and comparator device;

(g) maintaining a plurality of curves in said memory storage and comparator device which provides a unique momentary drive torque value in conjunction with a unique value for said amount of fuel being supplied to such vehicle'"'"'s engine correlated with a unique value for said rotational speed of said drive shaft for that amount of fuel; and

(h) determining said momentary drive torque on such vehicle'"'"'s engine from said plurality of curves by comparing said signals transmitted in steps (c and f) with said plurality of curves.

51. A method of controlling a vehicle in response to a constant speed drive torque signal, according to claim 49, wherein said determination of said weight comprises the steps of:

(a) receiving at least one signal value that is representative of said momentary drive torque of such vehicle'"'"'s engine in said apparatus for computing said weight;

(b) receiving at least two signal values that are representative of said acceleration of such vehicle at preselected time periods and under preselected driving conditions in said apparatus for computing said weight;

(c) establishing a functional relationship in said apparatus for computing said weight between said momentary drive torque and said acceleration, the solution of said functional relationship providing a weight value for such vehicle; and

(d) determining said weight of such vehicle by calculating a solution to said functional relationship established in step (c) from said at least one signal value representative of said momentary drive torque received in step (a) and said at least two signal values representative of said acceleration received in step (b).

52. A method of controlling a vehicle in response to a constant speed drive torque signal, according to claim 49, wherein said determination of said acceleration of such vehicle comprises the steps of:

(a) generating a signal value representative of the rotational speed of a driven wheel on such vehicle; and

(b) differentiating said signal value in step (a) to arrive at said acceleration value.

53. A method of controlling a vehicle in response to a constant speed drive torque signal, according to claim 49, further comprising the steps of:

(a) maintaining a plurality of curves in said transmission control system representing a range of operating limits for said constant speed drive torque; and

(b) comparing said constant speed drive torque signal with said plurality of curves maintained in step (a) prior to effectuating a gear change.

54. A method of controlling a vehicle in response to a constant speed drive torque signal, according to claim 53, further comprising the step of blocking said gear change when said comparison indicates said constant speed drive torque is outside said range of said operating limits.

55. A method of controlling a vehicle in response to a constant speed drive torque signal, according to claim 54, further comprising the step of maintaining said plurality of curves for said range of said operating limits for said constant speed drive torque in a range which provides a balance between fuel economy and engine performance.

56. A method of determining the constant speed drive torque of an engine in a vehicle, and controlling gear changes in the transmission control system of such vehicle in response to such constant speed drive torque determination, said method comprising the steps of:

(a) determining a momentary drive torque of such vehicle engine;

(b) generating at least one signal value that is representative of said momentary drive torque determined in step (a);

(c) determining the weight of such vehicle;

(d) generating at least one signal value that is representative of said weight of such vehicle determined in step (c);

(e) determining the accleration of such vehicle;

(f) generating a signal value that is representative of said acceleration determined in step (e) at a preselected time and under a preselected driving condition of such vehicle;

(g) transmitting said signal value generated in step (b) directly to a means for determining said weight of such vehicle in step (c) and directly to a means for determining said constant speed drive torque of such vehicle engine;

(h) transmitting said signal value generated in step (d) directly to said means for determining said constant speed drive torque of such vehicle engine;

(i) transmitting said signal value generated in step (f) directly to said means for determining said weight of such vehicle and directly to said means for determining said constant speed drive torque of such vehicle engine and directly to such transmission control system of such vehicle;

(j) determining a constant speed drive torque from said signals generated in steps (b, d and f) by subtracting the product of said signal value in step (d) and said signal value in step (f) from said signal value in step (b);

(k) generating a signal value that is representative of said constant speed drive torque of such vehicle engine;

(l) transmitting said signal value generated in step (k) directly to such transmission control system of such vehicle; and

(m) controlling such gear changes in such vehicle in response to said constant speed drive torque signal value generated in step (k).