Kinetic characteristic control system for vehicle

• US 5,806,010 A
• Filed: 09/14/1995
• Issued: 09/08/1998
• Est. Priority Date: 09/20/1994
• Status: Expired due to Term

• Current Assignee: Nippondenso Co., Ltd. (DENSO Corporation)
• Original Assignee: Nippondenso Co., Ltd. (DENSO Corporation)
• Inventors: Sawada, Mamoru
• Primary Examiner(s): Louis-Jacques, Jacques H.
• Application Number:
  US08/528,147
• Time in Patent Office: 1,090 Days
• Field of Search: 364/426.05, 364/426.028, 364/426.025, 364/426.036, 364/426.029, 364/426.023, 364/426.037, 364/426.031, 364/426.032 , 364/431.03, 364/431.04, 364/431.051, 364/431.052, 364/431.053, 364/431.07, 303/191, 303/156, 303/140, 303/146, 303/116.2, 303/113.2, 303/141, 303/150, 303/174, 303/61, 303/116.1, 303/116.4, 303/10, 303/166, 303/170, 303/178, 180/197, 477/185, 477/186, 477/187, 477/171, 477/174, 123/486, 123/564, 123/320
• US Class Current: 701/70
• 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: F16H 2059/506 Wheel slip
• CPC Class Codes: F16H 61/0213 characterised by the method for generating shift signals

Abstract

A kinetic characteristic control system performs a modifying process for modifying a standby control constant so as to, for example, decrease the standby start opening in correspondence with a calculated braking system control decrease amount x (step 230), a shift pattern characteristic modifying process for modifying a shift position change line so as to make a shift-up thereof easy (step 250), an EFI control amount modifying process for modifying a fuel injection amount, an air-fuel ratio, and an ignition timing (step 270), and a modifying process for a driving system TRC control performance (step 290). These modifying processes are intended for modifying the control constant, control amount, etc. so that the driving torque may decrease to thereby prevent the occurrence of excessive slippage of the drive wheels.

Claims

1. A kinetic characteristic control system for a vehicle having a wheel cylinder to impart a braking torque to a wheel and a pump for discharging a brake fluid of a high pressure to said wheel cylinder, comprising:

braking system control means for, by performing changeover control between supply of said brake fluid to said wheel cylinder from said pump and discharge of said brake fluid from said wheel cylinder, controlling said braking torque imparted to said wheel;

driving system control means for controlling a driving torque imparted to said wheel;

braking system control performance decrease state detecting means for detecting a state of decrease in a braking system control performance due to an increase in the viscous resistance of said brake fluid or a decease in the discharge capacity of said pump; and

driving system control correcting means for correcting control of the driving torque performed by said driving system control means in correspondence with the state of decrease in said braking system control performance.

2. A kinetic characteristic control system for a vehicle according to claim 1, wherein said braking system control performance decrease state detecting means includes brake fluid temperature detecting means and estimates said state of decrease in said braking system control performance on the basis of a temperature of said brake fluid detected by said brake fluid temperature detecting means.

3. A kinetic characteristic control system for a vehicle according to claim 2, wherein said brake fluid temperature detecting means includes engine cooling water temperature detecting means and estimates said brake fluid temperature on the basis of a engine cooling water temperature detected by said engine cooling water temperature detecting means.

4. A kinetic characteristic control system for a vehicle according to claim 1, further comprising:

acceleration slip detecting means for detecting that an acceleration slip has occurred in said vehicle, whereby when said acceleration slip has been detected by said acceleration slip detecting means, said braking system control means controls said braking torque imparted to said wheel and said driving system control means controls said driving torque imparted to said wheel, thereby suppressing said acceleration slip which has occurred within a desired range.

5. A kinetic characteristic control system for a vehicle according to claim 1, wherein said driving system control means controls said driving torque by adjusting the opening of a throttle for controlling the amount of air intake into an internal combustion engine of said vehicle.

6. A kinetic characteristic control system for a vehicle according to claim 1, wherein said driving system control means includes:

accelerator operation amount detecting means for detecting an amount of operation of an accelerator directing the opening of a throttle for controlling the amount of air intake into an internal combustion engine of said vehicle; and

standby control means for, in a case where it has been anticipated that an acceleration slip will occur on the basis of said amount of accelerator operation detected by said accelerator operation amount detecting means, controlling the output torque of the internal combustion engine so as to suppress same, whereby

said driving system control correcting means corrects the amount of accelerator operation for initiating the performance of said standby control, in correspondence with said state of decrease in said braking system control performance.

7. A kinetic characteristic control system for a vehicle according to claim 1, wherein said driving system control correcting means includes modifying means for modifying at least one of a fuel injection amount, an air-fuel ratio, and an ignition timing of an internal combustion engine of said vehicle, and modifies at least one of the fuel injection amount, air-fuel ratio, and ignition timing in correspondence with said state of decrease in said braking system control performance.

8. A kinetic characteristic control system for a vehicle according to claim 1, further comprising:

an automatic transmission adapted to automatically change over a shift position according to a preset automatic shift position change line, wherein

said driving system control correcting means includes shift position change line modifying means for modifying said automatic shift position change line and modifies said automatic shift position change line so that said shift position change line may be easily shifted up or may be shifted down with difficulty in correspondence with said state of decrease in said braking system control performance.

9. A kinetic characteristic control system for controlling a kinetic characteristic of a vehicle by generating a braking torque by imparting brake fluid to a wheel cylinder of a wheel also at a time other than a time when braking is performed by a vehicle'"'"'s drive, comprising:

braking-system control means for controlling said braking torque imparted to said wheel by performing changeover control between supply of said brake fluid to said wheel cylinder from a pump discharging the brake fluid at high pressure and discharge of the brake fluid from said wheel cylinder;

braking-system control performance decrease state detecting means for detecting a state of decrease in braking-system control performance due to an increase in the viscous resistance of said brake fluid or a decrease in a discharge capacity of said pump and

braking-system control correcting means for correcting braking torque control of said braking-system control means based on said state of decrease in said braking system control performance.

10. A kinetic characteristic control system for controlling a kinetic characteristic of a vehicle by generating a braking torque by imparting brake fluid to a wheel cylinder of a wheel also at a time other than a time when braking is performed by a vehicle'"'"'s drive, comprising:

braking-system control means for controlling said braking torque imparted to said wheel by performing changeover control between supply of said brake fluid to said wheel cylinder from a pump discharging the brake fluid at high pressure and discharge of the brake fluid from said wheel cylinder;

braking-system control performance decrease state detecting means for detecting a state of decrease in braking-system control performance due to an increase in the viscous resistance of said brake fluid or a decrease in a discharge capacity of said pump; and

braking-system control correcting means for correcting braking torque control of said braking-system control means;

wherein said braking system control correcting means corrects said braking torque control to advance a start timing of said braking torque control in correspondence with said state of decrease in said braking system control performance.

11. A kinetic characteristic control system for a vehicle according to claim 10, wherein said braking system control correcting means corrects said start timing of said braking torque control by correcting a drive start timing of said pump in such a manner as to advance said drive start timing thereof when detecting said state of decrease in said braking system control performance, compared to when not detecting same.

12. A kinetic characteristic control system for a vehicle according to claim 10, wherein said braking system control correcting means corrects said start timing of said brake torque control by correcting a brake fluid imparting timing to said wheel cylinder in such a manner as to advance said brake fluid imparting timing when detecting said state of decrease in said braking system control performance, compared to when not detecting same.

13. A kinetic characteristic control system for a vehicle according to claim 10, wherein said braking system control correcting means corrects a termination timing of a driving of said pump in such a manner as to delay said termination timing further when detecting said state of decrease in said braking system control performance than when not detecting same.