Vehicle brake hydraulic pressure control apparatus

• US 9,610,926 B2
• Filed: 11/14/2013
• Issued: 04/04/2017
• Est. Priority Date: 11/16/2012
• Status: Active Grant

• Current Assignee: Autoliv Nissin Brake Systems Japan Co., Ltd. (Autoliv Incorporated)
• Original Assignee: Autoliv Nissin Brake Systems Japan Co., Ltd. (Autoliv Incorporated)
• Inventors: Harada, Yutaka, Hiroya, Manabu
• Primary Examiner(s): Nguyen, Nga X
• Application Number:
  US14/080,413
• Publication Number:
  US 20140142825A1
• Time in Patent Office: 1,237 Days
• Field of Search: 701 70, 701 78
• CPC Class Codes: B60T 13/146 Part of the system directly actuated by booster pressure
• CPC Class Codes: B60T 13/662 characterised by specified functions of the control system components
• CPC Class Codes: B60T 13/686 in hydraulic systems or parts thereof
• CPC Class Codes: B60T 2201/06 Hill holder; Start aid systems on inclined road
• CPC Class Codes: B60T 7/122 for locking of reverse movement
• CPC Class Codes: B60T 8/17 Using electrical or electronic regulation means to control braking detecting or indicating faulty operation B60T8/885
• CPC Class Codes: B60T 8/3655 Continuously controlled electromagnetic valves
• CPC Class Codes: B60T 8/4872 pump-back systems
• CPC Class Codes: B60W 10/18 including control of braking systems
• CPC Class Codes: B60W 2520/14 Yaw
• CPC Class Codes: B60W 2540/18 Steering angle
• CPC Class Codes: B60W 30/18118 Hill holding

Abstract

One embodiment provides a vehicle brake hydraulic pressure control apparatus configured to perform a vehicle hold control which controls a brake hydraulic pressure when a vehicle comes to a halt. The vehicle brake hydraulic pressure control apparatus includes: a behavior determination section configured to determine whether or not a behaving amount in a lateral direction of the vehicle is equal to or larger than a first threshold; and an operation determination section configured to determine whether or not a control member provided to control the vehicle is operated. Further, the vehicle hold control is canceled at least when the behavior determination section determines that the behaving amount is equal to or larger than the first threshold and the operation determination section determines that the control member is operated.

Claims

1. A vehicle brake hydraulic pressure control apparatus configured to perform a vehicle hold control which controls a brake hydraulic pressure when a vehicle comes to a halt, comprising:

a behavior determination section configured to determine whether or not a behaving amount in a lateral direction of the vehicle is equal to or larger than a first threshold; and

an operation determination section configured to determine whether or not a control member provided to control the vehicle is operated,

wherein the vehicle hold control is canceled at least when the behavior determination section determines that the behaving amount is equal to or larger than the first threshold and the operation determination section determines that the control member is operated,

wherein the control member includes a steering, a brake pedal and a hold control selection switch, the hold control selection switch being operable to change a state of execution of the vehicle hold control between permission and cancellation,

wherein the vehicle hold control is configured to be canceled, in a first condition, the first condition includes,

that the brake pedal is operated, and

that the hold control selection switch is operated, and

wherein the vehicle hold control is configured to be canceled, in a second condition, the second condition includes, in a state where the behavior determination section determines that the behaving amount is equal to or larger than the first threshold,

that the steering is operated, or

that the brake pedal is operated, or

that the hold control selection switch is operated.

2. The vehicle brake hydraulic pressure control apparatus of claim 1,

wherein the operation determination section determines whether or not the control member is operated by determining whether or not an operation amount of the control member is equal to or larger than a second threshold.

3. The vehicle brake hydraulic pressure control apparatus of claim 2,

wherein the operation amount of the control member is a steering angle of a steering wheel which is outputted from a steering angle sensor.

4. The vehicle brake hydraulic pressure control apparatus of claim 1,

wherein the behaving amount is a yaw rate which is outputted from a yaw rate sensor.

5. The vehicle brake hydraulic pressure control apparatus of claim 1,

wherein, when the behavior determination section determines that the behaving amount is equal to or larger than the first threshold before the vehicle hold control is started, the vehicle hold control is prohibited from being performed.

6. The vehicle brake hydraulic pressure control apparatus of claim 1, wherein the control member is a steering wheel.

7. The vehicle brake hydraulic pressure control apparatus of claim 6, further comprising:

wheel speed sensors which detect wheel speeds of the wheels;

a steering angle sensor which detects a steering angle of a steering wheel;

a lateral acceleration sensor which detects an acceleration which acts in a lateral direction of the vehicle;

a yaw rate sensor which detects a turning angular velocity of the vehicle; and

an acceleration sensor which detects an acceleration in a front-to-rear or longitudinal direction of the vehicle.

8. The vehicle brake hydraulic pressure control apparatus of claim 7, wherein the behavior determination section determine whether or not a yaw rate outputted from the yaw rate sensor is equal to or larger than the first threshold and when determining the yaw rate is equal to or larger than the first threshold, the behavior determination section outputs a yaw rate generation signal which signals the determination to a hydraulic pressure control section.

9. The vehicle brake hydraulic pressure control apparatus of claim 8, wherein the operation determination section determines whether or not the steering wheel has been operated by determining whether or not a steering angle θ

which is outputted from the steering angle sensor is equal to or larger than a second threshold.

10. The vehicle brake hydraulic pressure control apparatus of claim 9, wherein when determining that the steering wheel has been operated, the operation determination section outputs an operation signal which signals the determination to the hydraulic pressure control section.

11. The vehicle brake hydraulic pressure control apparatus of claim 10, wherein the hydraulic pressure control section instruct a valve driver and a motor driver to operate various valves and to drive a motor, respectively, so as to control the brake hydraulic pressure in a plurality of types of control modes including a skid suppression control mode, a traction control mode and a vehicle hold control based on the signals which are inputted thereinto from at least the wheel speed sensors, the steering angle sensor, the lateral acceleration sensor, the yaw rate sensor, and the acceleration sensor.

12. The vehicle brake hydraulic pressure control apparatus of claim 11, wherein the vehicle hold control includes holding the brake hydraulic pressure to a brake hydraulic pressure at a value corresponding to a depression amount of a brake pedal and increasing the brake hydraulic pressure to be higher than a value corresponding to the depression amount of the brake pedal BP, when the vehicle comes to a halt.

13. The vehicle brake hydraulic pressure control apparatus of claim 11, wherein to start the vehicle hold control, the hydraulic pressure control section determines whether or not a vehicle hold control starting condition is met and whether or not a side slip occurs.

14. The vehicle brake hydraulic pressure control apparatus of claim 13, wherein when the behavior determination section determines that the yaw rate is equal to or larger than the first threshold before start of the vehicle hold control, the hydraulic pressure control section prohibits the start of the vehicle hold control.

15. The vehicle brake hydraulic pressure control apparatus of claim 14, wherein the hydraulic pressure control section cancels the vehicle hold control when the behavior determination section determines that the yaw rate Y is equal to or larger than the first threshold and the operation determination section determines that the steering wheel has been operated.

16. The vehicle brake hydraulic pressure control apparatus of claim 1, wherein the vehicle hold control includes holding the brake hydraulic pressure to a brake hydraulic pressure at a value corresponding to a depression amount of a brake pedal and increasing the brake hydraulic pressure to be higher than a value corresponding to the depression amount of the brake pedal BP, when the vehicle comes to a halt.

17. The vehicle brake hydraulic pressure control apparatus of claim 1, wherein to start the vehicle hold control, a hydraulic pressure control section determines whether or not a vehicle hold control starting condition is met and whether or not a side slip occurs.