Control apparatus for controlling device loaded on vehicle

• US 4,825,367 A
• Filed: 12/23/1987
• Issued: 04/25/1989
• Est. Priority Date: 12/23/1986
• Status: Expired due to Term

• Current Assignee: Mazda Motor Corporation
• Original Assignee: Mazda Motor Corporation
• Inventors: Matsuoka, Toshihiro, Nagaoka, Mitsuru
• Primary Examiner(s): LaRoche, Eugene R.
• Assistant Examiner(s): MIS, DAVID C
• Application Number:
  US07/136,997
• Time in Patent Office: 489 Days
• Field of Search: 364/424, 364/424.1, 364/426, 364/427, 364/428, 364/431.01, 364/432, 364/433, 364/434, 364/436
• US Class Current: 701/36
• CPC Class Codes: B60G 2800/215 by applying a braking action on each wheel individually
• CPC Class Codes: B60K 31/047 the memory being digital
• CPC Class Codes: B60T 8/175 Brake regulation specially adapted to prevent excessive wheel spin during vehicle acceleration, e.g. for traction control safety devices for propulsion unit control responsive to, or preventing, skidding of wheels B60K28/16
• CPC Class Codes: B60T 8/48 connecting the brake actuator to an alternative or additional source of fluid pressure , e.g. traction control systems
• CPC Class Codes: B60W 2050/0022 Gains, weighting coefficients or weighting functions
• CPC Class Codes: B60W 2520/105 Longitudinal acceleration
• CPC Class Codes: B60W 2540/18 Steering angle
• CPC Class Codes: F02B 1/04 with fuel-air mixture admission into cylinder

Abstract

A control value of the control apparatus for controlling a device or devices loaded on a vehicle, for example, a slip ratio against a road surface of driven wheels for a slip control apparatus (traction control apparatus) is determined as a final control value based on plural input signals.

For every input signal, plural control zones coresponding to its signal value are present.

For every combination of the control zones, a basic control value is memorized in a memory; an adaptability for the control zone corresponding to each signal value is determined as a first adaptability; a second adaptability is determined on the basis of the first adaptability obtained for every input signal; and an inference control value is then determined on the basis of the second adaptability and the basic control value.

From the numbers of inference control values and second adaptabilities corresponding to the number of all combinations of the control zones, there is determined the final control value.

Claims

1. In a control apparatus for controlling a device loaded on a vehicle in which a control value therefor is on the basis of plural input signals, said control apparatus comprising:

basic control value memorizing means for memorizing a basic control value obtained for every combination of plural control zones present for every signal value of said input signals;

adaptability determining means for determining a second adaptability for every combination from a first adaptability obtained for every control zone with respect to every combination of said control zones;

inference control value determining means for determining an inference control value for every combination from said basic control value and said second adaptability; and

final control value determining means for determining a final control value from said second adaptabilities and said inference control values.

2. A control apparatus as claimed in claim 1, wherein the number of said control zones is two, a first control zone being set for a larger signal value and a second control zone being for smaller signal value.

3. A control apparatus as claimed in claim 2, wherein:

a signal value for an input signal comprises a first value and a second value larger than the first value;

a first adaptability for said first control zone is 0 to 0% and a first adaptability for said second control zone is 1.0 or 100% when the signal value of said input signal is smaller than said first value;

a first adaptability for said first control zone is 1.0 or 100% and a first adaptability for said second control zone is 0 to 0% when the signal value of said input signal is larger than said second value; and

said first adaptability or said first control zone gets larger and said first adaptability for said second control zone gets smaller as the signal value gets larger, when the signal value is between said first value and said second value.

4. A control apparatus as claimed in claim 1, wherein:

said first adaptability for each of said control zones is set as a value ranging from 0 to 1.0; and

a second adaptability for each combination is obtained by multiplying all of said first adaptabilities.

5. A control apparatus as claimed in claim 1, wherein said adaptability determining means comprises:

adaptability memorizing means for memorizing a first adaptability as a value in the range from 0 to 1.0;

first adaptability determining means for determining a first adaptability for each of said signals by referring a value of each of said input signals to said adaptability memorizing means; and

second adaptability determining means for determining a second adaptability for every combination of said control zones by multiplying said first adaptabilities determined by said first adaptability determining means.

6. A control apparatus as claimed in claim 1, wherein:

said adaptability for each combination is determined as a value in the range between 0 and 1.0 by said adaptability determining means; and

said inference control value determining means gives said inference control value by multiplying said basic control value by said second adaptability determined by said adaptability determining means.

7. A control apparatus as claimed in claim 1, wherein:

said second adaptability for each combination is determined as a value in the range betwen 0 and 1.0 by said adaptability determining means;

said inference control value determining means gives said inference control value by multiplying said basic control value by said second adaptability determined by said adaptability determining means; and

said final control value determining means gives said final control value by dividing an addition of all said inference values by an addition of all said second adaptabilities.

10. A control apparatus as claimed in claim 1, wherein said control apparatus is an automatic drive apparatus for controlling an engine output by way of the feedback control so as to allow an actual vehicle speed to become a target vehicle speed;

and

said final control value determined by said final control value determining means is a control gain in the feedback control.

11. A control apparatus as claimed in claim 1, wherein said control apparatus is a slip control apparatus in which a torque transmitted to the driven wheel is adjusted so as to allow a magnitude of a slip of the driven wheel against a road surface to become a predetermined target slip ratio;

and

said final control value determined by said final control value determining means is said target slip ratio.

12. A control apparatus as claimed in claim 11, wherein said slip control apparatus adjusts the torque transmitted to the driven wheel at least by an output torque of an engine;

and

the final control value determined by said final control value determining means is a target slip ratio for said engine.

13. A control apparatus as claimed in claim 11, wherein said slip control apparatus adjusts the torque transmitted to the driven wheel at least by a braking force applied by the brake to the driven wheel;

and

the final control value determined by said final control value determining means is a target slip ratio for said brake.

14. A control apparatus as claimed in claim 11, wherein said slip control apparatus adjusts the torque transmitted to the driven wheel both by an output torque of an engine and by a braking force applied by the brake to the driven wheel.

15. A control apparatus as claimed in claim 14, wherein said basic control value memorizing means contains at least two kinds of memorizing means for an engine and a brake, and the final control value determined by said final control value determining means is two kinds, one for a target slip ratio for an engine and the other for a target slip ratio for a brake.

16. A control apparatus as claimed in claim 11, wherein said plural input signal contain a signal for a vehicle speed;

and

said target slip ratio gets smaller when the vehicle speed is larger compared to a smaller vehicle speed.

17. A control apparatus as claimed in claim 11, wherein said input signals contain signals for a vehicle speed, an acceleration of a vehicle body, and a steered angle of a steering wheel.

8. In a control apparatus for controlling a device loaded on a vehicle in which a control value therefor is on the basis of plural input signals, said control apparatus comprising:

basic control value memorizing means for memorizing a basic control value obtained for every combination of plural control zones preset for every signal value of said input signals;

adaptability memorizing means for memorizing a first adaptability of each control zone as a value in the range from 0 to 1.0, said control zone being set independently and individually for each input signal;

first adaptability determining means for determining a first adaptability for each of said input signals by referring a value of each of said input signals to said adaptability memorizing means;

second adaptability determining means for determining a second adaptability for each combination of said control zones by multiplying said first adaptabilities determined by said first adaptability determining means;

inference control value determining means for determining an inference control value for every combination by multiplying the basic control value and the second adaptability determined by said adaptability determining means; and

final control value determining means for determining a final control value by dividing a value obtained by adding all inference control values for said combinations with a value obtained by adding all second adaptabilities.

9. In a control apparatus for controlling a device loaded on a vehicle in which a control value therefor is on the basis of plural input signals, said control apparatus comprising:

basic control value memorizing means for memorizing a basic control value obtained for every combination of plural control zones preset for every signal value of said input signals;

inference control value determining means for determining an inference control value on the basis of said basic control value and a second adaptability for every combination by first obtaining first adaptabilities for said respective control zones and then obtaining said second adaptability on the basis of said first adaptabilities from one combination of another; and

final control value determining means for determining a final control value from said second adaptability and said inference control value.