Process for the adaptive control of an internal-combustion engine and/or another drive component of a motor vehicle

• US 5,063,510 A
• Filed: 07/31/1989
• Issued: 11/05/1991
• Est. Priority Date: 07/29/1988
• Status: Expired due to Fees

• Current Assignee: Daimler-Benz AG (Mercedes-Benz Group AG)
• Original Assignee: Daimler-Benz AG (Mercedes-Benz Group AG)
• Inventors: Jurgens, Gunter, Lang, Lothar, Surig, Udo
• Primary Examiner(s): Cangialosi, Salvatore
• Application Number:
  US07/387,530
• Time in Patent Office: 827 Days
• Field of Search: 364/424.1, 364/431.04, 364/431.05, 364/431.07, 364/431.08, 364/431.06, 74/866, 74/867, 123/489, 123/571
• US Class Current: 701/58
• 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: F02D 41/2416 Interpolation techniques
• CPC Class Codes: F02D 41/2441 characterised by the learning conditions
• CPC Class Codes: F02D 41/2451 characterised by what is learned or calibrated
• CPC Class Codes: F16H 2061/0087 Adaptive control, e.g. the control parameters adapted by learning
• CPC Class Codes: F16H 63/502 for smoothing gear shifts

Abstract

In a process for adaptive control of an internal-combustion engine or of another drive component of a motor vehicle, a set value/actual value comparison of a critical time interval with regard to an optimum operating behaviour is triggered upon each non-steady operating state. Set values and correction values for influencing a casual controlled variable with regard to the operating behaviour are assigned to selected operating points of the internal-combustion engine in the form of stored characteristic maps. If appropriate, the correction values are replaced by new correction values, determined according to a deviation. If the non-steady operating state occurs at a non-selected operating point, intermediate values for set value and correction value are interpolated. The interpolated correction intermediate value is used for influencing the controlled variable during the instantaneous non-steady operating state and, in the event of a deviation, for determining a new correction value, which is transferred exclusively into a neighboring selected operating point of the characteristic map.

Claims

1. A process for adaptive control of a drive component in a motor vehicle having an internal-combustion engine, the drive component having a critical time interval with respect to a controlled variable for a predefined operating behavior of the drive component at selected operating points, the process comprising the steps of:

detecting an occurrence of a non-steady operating state of the drive component using a detection means (59);

obtaining a selected set value for the critical time interval from a memory means (91) upon detecting said non-steady operating state for one of the selected operating points, said memory means storing a first characteristic map of set values assigned to the selected operating points of the internal-combustion engine including speed and load information on the selected operating points;

obtaining an actual value for the critical time interval from a measuring means (67) upon detecting said non-steady operating state for the one selected operating point;

comparing said selected set value with the actual value in a comparison means (73) and determining whether any deviation exceeds a threshold value;

calculating a selected updated correction value for controlling the controlled variable with regard to the predefined operating behavior using an arithmetic means (99) if said deviation exceeds the threshold value;

entering (123) said selected updated correction value into a second characteristic map for correction values assigned to the selected operating points of the internal combustion engine and using said selected updated correction value to control the controlled variable (132) for a subsequent non-steady operating state of the drive component at its assigned selected operating point wherein a new selected updated correction value is entered for each occurrence of a subsequent non-steady operating state having a deviation exceeding the threshold value;

interpolating selected set values received from said memory means (91) for selected operating points neighboring a non-selected operating point in a second arithmetic means (66) to obtain a non-selected set value (t_set(ZW)) (25) for a non-steady operating state occurring at the non-selected operating point;

interpolating selected correction values received from a second memory means (90) for selected operating points neighboring the non-selected operating point in a third arithmetic means (92) to obtain a non-selected instantaneous correction value (K_ZW) (122) for the non-steady operating state occurring at the non-selected operating point;

controlling said controlled variable (122) with said non-selected instantaneous correction value;

comparing said non-selected set value (t_set(ZW)) with the actual value in a second comparison means (93) and determining whether any deviation exceeds the threshold value;

calculating a theoretical new correction value (K_new(ZW)) in a fourth arithmetic means (97) for the non-selected operating point when the deviation exceeds the threshold value;

calculating a transferred correction value (K_new(u)) in a transfer stage means (98) from the theoretical new correction value (K_new(ZW)) taking into account positional deviation of the non-selected operating point relative to the neighboring selective operating points;

entering in the second characteristic map said transferred correction value (K_new(u)) at one of said neighboring selected operating points; and

employing the selected updated correction value and the non-selected instantaneous correction value for controlling the drive component of the motor vehicle.

2. A process according to claim 1, further comprising the steps of:

dividing said critical time interval into at least two phases, wherein the first characteristic map includes two characteristic set value maps, one set value map for each of said phases and wherein the second characteristic map includes two characteristic correction value maps, one correction value map for each of said phases;

using said two characteristic set value maps to determine selected set values assigned to selected operating points; and

using said two characteristic correction value maps to determine selected updated correction values assigned to selected operating points.

3. A process according to claim 1, wherein said step of entering in the second characteristic map said transferred correction value is performed only for a nearest neighboring selected operating point in the second characteristic map in the event said deviation exceeds the threshold value for a non-steady operating state at a non-selected operating point.

4. A process according to claim 1, wherein the step of entering in the second characteristic map said transferred correction value includes entering a transferred correction value which differs from a previous correction value of the neighboring selected operating point essentially by the difference of the non-selected instantaneous correction value (K_ZW) and the theoretical new correction value (K_new(ZW)) of the non-selected operating point.

5. An arrangement for adaptive control of a drive component in a motor vehicle having an internal-combustion engine, the drive component having a critical time interval with respect to a controlled variable for a predefined operating behavior of the drive component at selected operating points, the arrangement comprising:

means for detecting (59) an occurrence of a non-steady operating state of the drive component;

memory means (90,

     91) for obtaining a selected set value for the critical time interval upon detecting said non-steady operating state for one of the selected operating points, said memory means storing a first characteristic map of set values assigned to the selected operating points of the internal-combustion engine including speed and load information on the selected operating points and a second characteristic map for correction values assigned to the selected operating points of the internal-combustion engine;

means for obtaining (61, 62, 63, 67 and

     131) an actual value for the critical time interval upon detecting said non-steady operating state for the one selected operating point;

means for comparing (73) said selected set value with the actual value and determining whether any deviation exceeds a threshold value;

first arithmetic means (99) for calculating a selected updated correction value for controlling the controlled variable with regard to the predefined operating behavior if said deviation exceeds the threshold value;

means for entering (123) said selected updated correction value into said second characteristic map for correction values assigned to the selected operating points of the internal combustion engine;

means of controlling the controlled variable with said selected updated correction value for a subsequent non-steady operating state of the drive component at its assigned selected operating point wherein a new selected updated correction value is entered into said second characteristic map for each occurrence of a subsequent non-steady operating state having a deviation exceeding the threshold value; and

said memory means (90,

     91) sorting the first and second characteristic maps and including a memory word having n memory cells wherein (n-y) memory cells are used for the entry of the selected updated correction value and wherein y memory cells are used for the entry of the selected set value, said selected updated correction value and said selected set value of the memory word being assigned to the same one selected operating point.

6. An arrangement according to claim 5, wherein n=8 and y-2.

7. An arrangement according to claim 5, wherein a number p of selected operating points is less than about 20.

8. An arrangement according to claim 7, wherein p equals about 9.

9. An arrangement according to claim 5, wherein said means for obtaining an actual value is a measuring means (67), and wherein said means for detecting (59) is connected to inputs of said memory means (90, 91), the arrangement further comprising:

final control element means (33,

     84) for controlling the controlled variable;

second arithmetic means (66) for interpolating selected set values received from said memory means (91) for selected operating points neighboring a non-selected operating point to obtain a non-selected set value (t_set(ZW)) for a non-steady operating state occurring at the non-selected operating point;

third arithmetic means (92) for interpolating selected correction values received from a second memory means (90) for selected operating points neighboring the non-selected operating point to obtain a non-selected instantaneous correction value (K_ZW) for the non-steady operating state occurring at the non-selected operating point;

second means for comparing (93) said non-selected set value with the actual value and determining whether any deviation exceeds the threshold value;

wherein the second and third arithmetic means each have an input side coupled to the detection means (59) and to the memory means (90,

     91);

wherein the second comparator means (73) has an input side which is coupled both to the measuring means (67) and to the second arithmetic means (66) for providing set values assigned to non-selected operating points; and

wherein the third arithmetic means (92) for calculating correction values for non-selected operating points has an output side which is coupled at least indirectly to the final control element means (89, 33,

     84).

10. An arrangement according to claim 9, further comprising:

fourth arithmetic means (97) for calculating a theoretical new correction value (K_new(ZW)) for the non-selected operating point when the deviation exceeds the threshold value;

transfer stage means (98) for calculating a transferred correction value (K_new(u)) from the theoretical new correction value taking into account positional deviation of the non-selected operating point relative to the neighboring selective operating points;

means for entering (32) in the second characteristic map said transferred correction value (K_new(u)) at one of said neighboring selected operating points;

said fourth arithmetic means (97) having inputs coupled to the second comparison means (93) and the second arithmetic means (66); and

said transfer stage means (98) having inputs coupled to the detection means (59) and to the fourth arithmetic means (97) as well as to outputs of said memory means (90) and to said third arithmetic means (92), said transfer stage means (98) further having an output side coupled to an input of said memory means (90).

11. An arrangement according to claim 10, wherein said comparing means (73) has inputs coupled to the measuring means (67) and said memory means (91);

and

wherein said first arithmetic means (99) has inputs coupled to said comparing means (73) and outputs of said memory means (90,

     91) and has an output coupled to the input of said memory means (90).

12. An arrangement according to claim 11, wherein said drive component is a speed-change gear including an automatic shift mechanism having friction elements and a gear transmission, further comprising shift final control elements for actuating the friction elements;

wherein the critical time interval is a shifting time during which the speed-change gear is shifted between a beginning point and an end point; and

wherein the control variable is a control pressure, said control pressure controlling the working or shifting pressure for operation of said shift final control elements.

13. An arrangement according to claim 12, wherein said shifting time is determined by registering a change in the gear transmission.

14. An arrangement according to claim 12, further comprising:

means for directly determining an associated shift subtime in at least one phase of the shifting time, and

means for registering a change in the gear transmission, thereby determining an associated shift subtime in at least one further phase.

15. An arrangement according to claim 12, further comprising:

means for subdividing the shift time into a total of three phases, and

means for registering a change in the gear transmission, thereby determining an associated shift subtime for each phase.

16. An arrangement according to claim 12, further comprising means for measuring a speed of a gear element connected indirectly to a gearbox input shaft for determining a gearbox input speed.

17. An arrangement according to claim 16, wherein the gear element is connected to a gear speed brake.

18. An arrangement according to claim 11, wherein said drive component includes an exhaust catalytic converter of said internal-combustion engine with a first λ

probe, positioned ahead of the exhaust catalytic converter and connected to a controller means for optimization of an air-fuel ratio of the internal-combustion engine and with a second λ

probe, positioned after the exhaust catalytic converter,

the measuring means includes means for measuring a time interval during which the second λ

probe indicates an incorrect air-fuel ratio, and

both the memory means and the third arithmetic means include outputs which are connected at least indirectly to the controller means.

19. An arrangement according to claim 18, wherein the detection means includes means for responding to a deflection of a flowmeter pressure plate arranged in an intake line system of the internal-combustion engine during a constant speed of the internal-combustion engine.

20. An arrangement according to claim 11, wherein said drive component includes an anti-knock control mechanism means of said internal-combustion engine used to avoid knocking combustion, wherein said comparing means is a combustion comparison means for comparing a reference signal, representing a parameter value for a predetermined combustion, with a combustion indicator signal, indicative of the combustion, and, wherein in cases of unacceptable deviations of the combustion indicator signal control means, control a controlled variable for determining pressure in a combustion chamber to eliminate knocking combustion,

the measuring means includes means for measuring a time interval during deviations of the combustion indicator signal, and

both the memory means and the third arithmetic stage means are connected at least indirectly to the anti-knock control means.

21. An arrangement according to claim 20, wherein the detection means includes means for responding to deviations of the combustion indicator, directed in the sense of at least one of abnormally high pressure and abnormally high temperature.

22. An arrangement according to claim 21, wherein at least one of an intake pressure and a charging pressure of the internal-combustion engine is used as the controlled variable determining the pressure in the combustion chamber.