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Vehicle motion control device

Imported: 24 Feb '17 | Published: 06 Jan '04

Akitaka Nishio

USPTO - Utility Patents

Abstract

A vehicle motion control device which detects an abnormality of an automatic hydraulic pressure generator having a master cylinder, a booster which boosts the master cylinder and a booster actuator which actuates the booster irrespective of brake pedal operation and performs an appropriate transaction upon detecting the abnormality. The vehicle motion control device includes the automatic hydraulic pressure generator, a hydraulic pressure control valve disposed between the automatic hydraulic pressure generator and a wheel cylinder, and a controller performing the automatic pressure increase control by actuating the hydraulic pressure control valve and the booster actuator according to the vehicle running condition. By calculating a master cylinder hydraulic pressure based on a variable state of the booster actuator and comparing the calculated value with the master cylinder hydraulic pressure detected by a hydraulic pressure sensor, an abnormality of the automatic hydraulic pressure generator is detected during non-operation of the brake pedal.

Description

BRIEF DESCRIPTION OF THE DRAWING FIGURES

The foregoing and additional features and characteristics of the present invention will become more apparent from the following detailed description considered with reference to the accompanying drawing figures in which like reference numerals designate like elements.

FIG. 1 is a schematic illustration of a vehicle motion control device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a portion of a vacuum booster and a booster actuator used in the device shown in FIG.

1.

FIG. 3 is a flowchart showing the brake steering control according to the present invention.

FIG. 4 is a flowchart showing the brake steering control operation carried out in the routine shown in FIG.

3.

FIG. 5 is a flowchart showing the hydraulic pressure servo control operation carried out in the routine shown in FIG.

3.

FIG. 6 is a flowchart showing the abnormality judgment operation carried out in the routine shown in FIG.

3.

FIG. 7 is a flowchart showing the calculation of a second master cylinder hydraulic pressure value that is carried out in FIG.

6.

FIG. 8 is a flowchart showing the calculation of a second vehicle body deceleration that is carried out in FIG.

6.

FIG. 9 is a graph showing a control region of an oversteer refraining control according to the present invention.

FIG. 10 is a graph showing a control region of an understeer refraining control according to the present invention.

FIG. 11 is a graph showing the relationship between a parameter for a brake hydraulic pressure control and a hydraulic pressure mode.

Claims

1. A vehicle motion control device comprising:

2. The vehicle motion control device according to claim 1, further comprising:

3. The vehicle motion control device according to claim 1, wherein the booster is a vacuum booster comprising;

4. A vehicle motion control device comprising:

5. The vehicle motion control device according to claim 4, further comprising:

6. The vehicle motion control device according to claim 4, wherein the booster is a vacuum booster comprising;

7. A vehicle motion control device comprising:

8. A vehicle motion control device comprising:

9. The vehicle motion control device according to claim 8, further comprising:

10. A vehicle motion control device comprising:

11. The vehicle motion control device according to claim 10, further comprising:

12. A method of controlling vehicle motion in a vehicle that includes a wheel cylinder operatively associated with a vehicle wheel for applying a braking force to the wheel, an automatic hydraulic pressure generator having a master cylinder, a booster and a booster actuator, with the master cylinder supplying master cylinder hydraulic pressure to the wheel cylinder, the booster boosting actuation of the master cylinder in accordance with operation of a brake pedal and the booster actuator actuating the booster irrespective of operation of the brake pedal to generate the master cylinder hydraulic pressure in the master cylinder, and a hydraulic pressure control valve disposed between the automatic hydraulic pressure generator and the wheel cylinder for controlling a brake hydraulic pressure of the wheel cylinder, the method comprising:

13. A method of controlling vehicle motion in a vehicle that includes a wheel cylinder operatively associated with a vehicle wheel for applying a braking force to the wheel, an automatic hydraulic pressure generator having a master cylinder, a booster and a booster actuator, with the master cylinder supplying master cylinder hydraulic pressure to the wheel cylinder, the booster boosting actuation of the master cylinder in accordance with operation of a brake pedal and the booster actuator actuating the booster irrespective of operation of the brake pedal to generate the master cylinder hydraulic pressure in the master cylinder, and a hydraulic pressure control valve disposed between the automatic hydraulic pressure generator and the wheel cylinder for controlling a brake hydraulic pressure of the wheel cylinder, the method comprising:

14. The method according to claim 13, wherein the booster actuator includes a solenoid and the detected variable state of the booster actuator includes an electric current of the solenoid.

15. A method of controlling vehicle motion in a vehicle that includes a wheel cylinder operatively associated with a vehicle wheel for applying a braking force to the wheel, an automatic hydraulic pressure generator having a master cylinder, a booster and a booster actuator, with the master cylinder supplying master cylinder hydraulic pressure to the wheel cylinder, the booster boosting actuation of the master cylinder in accordance with operation of a brake pedal and the booster actuator actuating the booster irrespective of operation of the brake pedal to generate the master cylinder hydraulic pressure in the master cylinder, and a hydraulic pressure control valve disposed between the automatic hydraulic pressure generator and the wheel cylinder for controlling a brake hydraulic pressure of the wheel cylinder, the method comprising:

16. The method according to claim 15, further comprising:

17. A method of controlling vehicle motion in a vehicle that includes a wheel cylinder operatively associated with a vehicle wheel for applying a braking force to the wheel, an automatic hydraulic pressure generator having a master cylinder, a booster and a booster actuator, with the master cylinder supplying master cylinder hydraulic pressure to the wheel cylinder, the booster boosting actuation of the master cylinder in accordance with operation of a brake pedal and the booster actuator actuating the booster irrespective of operation of the brake pedal to generate the master cylinder hydraulic pressure in the master cylinder, and a hydraulic pressure control valve disposed between the automatic hydraulic pressure generator and the wheel cylinder for controlling a brake hydraulic pressure of the wheel cylinder, the method comprising: