VEHICLE BRAKE SYSTEM

• US 20140350816A1
• Filed: 05/20/2014
• Published: 11/27/2014
• Est. Priority Date: 05/22/2013
• Status: Active Grant

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: TAHARA, Shunpei, IKEDA, Tohru, SAKURAI, Kazuya, SUGITA, Yoshinari
• Granted Patent: US 9,037,375 B2
• Time in Patent Office: Days
• US Class Current: 701/70
• 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 13/745 acting on a hydraulic system, e.g. a master cylinder
• CPC Class Codes: B60T 7/042 by electrical means, e.g. using travel or force sensors
• CPC Class Codes: B60T 8/4081 Systems with stroke simulating devices for driver input B60T8/4077 takes precedence
• CPC Class Codes: B60T 8/44 co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device , i.e. open systems

Abstract

Provided is a vehicle brake system capable of reducing a sense of discomfort felt by a driver, even if a transmission is shifted when a braking force holding function for keeping a vehicle stationary is in operation. A vehicle brake system includes a control system capable of determining whether an automatic transmission is set in a driving mode or in a non-driving mode, and is capable of operating the braking force holding function for keeping the vehicle stationary by holding a braking force generated through a brake pedal operation. Further, the control system operates the braking force holding function when a vehicle speed becomes lower than a predetermined threshold value by the braking force generated through the brake pedal operation, and if the control system determines that the automatic transmission is set in a non-driving mode, the control unit increases the braking force and holds the braking force.

Claims

1. A vehicle brake system comprising:

a control unit capable of determining whether a transmission is set in a driving mode, in which a power outputted by a power unit of a vehicle is transmitted to driving wheels, or in a non-driving mode other than the driving mode; and

a booster unit for increasing a braking force generated when a brake operation unit is operated,

the vehicle brake system being configured to be able to operate a braking force holding function for holding the braking force which is generated by operating the brake operation unit,

wherein the control unit operates the braking force holding function when the braking force is applied and a speed of the vehicle becomes lower than a predetermined speed threshold value, and

when the control unit operates the braking force holding function and determines that the transmission is set in the non-driving mode, the control unit increases the braking force, which is generated by operating the brake operation unit, by the booster unit and holds the braking force.

2. The vehicle brake system according to claim 1,

wherein when the control unit operates the braking force holding function and determines that the transmission is set in the non-driving mode, if the braking force generated by operating the brake operation unit is smaller than a predetermined defined braking force, the control unit increases the braking force by the booster unit up to the defined braking force and holds the braking force.

3. A vehicle brake system comprising,

a control unit capable of determining whether a transmission is set in a driving mode, in which a power outputted by a power unit of a vehicle is transmitted to driving wheels, or in a non-driving mode other than the driving mode,

the vehicle brake system being configured to be able to operate a braking force holding function for holding a braking force which is generated by operating a brake operation unit,

wherein when the braking force is applied and a speed of the vehicle becomes lower than a predetermined speed threshold value, if the control unit determines that the transmission is set in the non-driving mode, the control unit operates the braking force holding function when the braking force is more than or equal to a predetermined defined braking force.