Vehicle posture control apparatus

• US 20020082762A1
• Filed: 10/24/2001
• Published: 06/27/2002
• Est. Priority Date: 10/24/2000
• Status: Active Grant

• Current Assignee: Advics Company Limited (Aisin Corp.), Mazda Motor Corporation
• Original Assignee: Mazda Motor Corporation, Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Inventors: Tanaka, Hirohisa, Watanabe, Yoshihiro, Yasutake, Toshio
• Granted Patent: US 6,622,073 B2
• Time in Patent Office: Days
• US Class Current: 701/70
• CPC Class Codes: B60T 2220/03 Driver counter-steering; Avoidance of conflicts with ESP control
• CPC Class Codes: B60T 8/1755 Brake regulation specially adapted to control the stability of the vehicle, e.g. taking into account yaw rate or transverse acceleration in a curve road vehicle drive control systems for control of driving stability otherwise than by controlling a particular sub-unit B60W30/02

Abstract

In a posture control apparatus controlling the posture of a vehicle in yawing direction by independently controlling brakes of the wheels, intervention of a first oversteer control is carried out when the oversteering tendency of the vehicle is stronger than a first preset reference value, intervention of a second oversteer control, in which the control amount is lower than in the first oversteer control, is carried out when the oversteering tendency of the vehicle is not stronger than the first preset reference value, but stronger than a second preset reference value, and intervention of a third oversteer control, in which the control amount is lower than in the first oversteer control, is carried out when the oversteering tendency of the vehicle is not stronger than the second preset reference value, but stronger than a third preset reference value.

Claims

1. A vehicle posture control apparatus provided with a control means for controlling posture of the vehicle in yawing direction by independently controlling brakes of the vehicle'"'"'s wheels,

wherein the control means carries out intervention of a first oversteer control suppressing an oversteering tendency when the oversteering tendency of the vehicle is stronger than a first preset reference value;

and

wherein the control means carries out intervention of a second oversteer control, in which the control amount is lower than in the first oversteer control, when the oversteering tendency of the vehicle is not stronger than the first preset reference value, but stronger than a second preset reference value.

2. The vehicle posture control apparatus according to claim 1, wherein the second oversteer control supplies, by open control, a brake pressure whose upper limit is a predetermined brake pressure that is lower than the maximum brake pressure that can be supplied in the first oversteer control.

3. The vehicle posture control apparatus according to claim 1, wherein the second oversteer control supplies brake pressure in accordance with a deviation between a target yaw rate that has been set and the actual yaw rate.

4. The vehicle posture control apparatus according to claim 1, wherein the control means prohibits intervention of the second oversteer control when the vehicle has an understeering tendency.

5. A vehicle posture control apparatus provided with a control means for controlling posture of the vehicle in yawing direction by independently controlling brakes of the vehicle'"'"'s wheels,

wherein the control means carries out intervention of a first oversteer control suppressing an oversteering tendency when the oversteering tendency of the vehicle is stronger than a first preset reference value;

wherein the control means carries out intervention of a second oversteer control, in which the control amount is lower than in the first oversteer control, when the oversteering tendency of the vehicle is not stronger than the first preset reference value, but stronger than a second preset reference value; and

wherein the control means carries out intervention of a third oversteer control, in which the control amount is lower than in the first oversteer control, when the oversteering tendency of the vehicle is not stronger than the second preset reference value, but stronger than a third preset reference value.

6. The vehicle posture control apparatus according to claim 5, wherein a supply ratio of brake pressure during the third oversteer control is set to be lower than a supply ratio of brake pressure during the second oversteer control.

7. The vehicle posture control apparatus according to claim 5, wherein the second oversteer control supplies, by open control, a brake pressure whose upper limit is a predetermined brake pressure that is lower than the maximum brake pressure that can be supplied in the first oversteer control.

8. The vehicle posture control apparatus according to claim 5, wherein the third oversteer control supplies brake pressure in accordance with a deviation between a target yaw rate that has been set and the actual yaw rate.

9. The vehicle posture control apparatus according to claim 5, wherein upper limits of the brake pressure in the second and third oversteer control is set to 10 to 25 bar.

10. The vehicle posture control apparatus according to claim 5, wherein the control means prohibits intervention of the second oversteer control when the vehicle has an understeering tendency.

11. The vehicle posture control apparatus according to claim 5, wherein the control means prohibits intervention of the third oversteer control when the vehicle has an understeering tendency.