Pedal oscillation suppression
AssigneeRobert Bosch GmbH
InventorRyan Kuhlman
Life of this patent
Estimating the term…
Abstract
A vehicle brake system. The system includes a wheel brake, a brake pedal, a master cylinder, a first valve, a second valve, a pump, a pressure sensor, a pressure controlling device, and a controller. The master cylinder increases a pressure of a brake fluid in the brake system based on a user depressing the brake pedal. The pump pumps the brake fluid through the first valve to the wheel brake and to draw the brake fluid from the wheel brake through the second valve. The pressure sensor senses a pressure of the brake fluid in the brake system. The pressure controlling device reduces a pressure of the brake fluid at the master cylinder. The controller operates the first and second valves, the pump, and the pressure controlling device during a controlled braking event.
Claims14
A vehicle brake system, the system comprising:
- a wheel brake;
- a brake pedal;
- a master cylinder coupled to the brake pedal and configured to increase a pressure of a brake fluid in the brake system based on a user depressing the brake pedal;
- a first valve having an open position in which the brake fluid flows through the valve and a closed position where the brake fluid is prevented from flowing through the valve;
- a second valve having an open position in which the brake fluid flows through the valve and a closed position where the brake fluid is prevented from flowing through the valve;
- a pump configured to pump the brake fluid through the first valve to the wheel brake and to draw the brake fluid from the wheel brake through the second valve;
- a pressure sensor configured to sense a pressure of the brake fluid in the brake system;
- a volume manipulation device configured to cause a change in a capacity of the vehicle brake system;
- and
- a controller configured to receive an indication of the pressure of the brake fluid from the pressure sensor, to operate the first and second valves, the pump, and the volume manipulation device during a controlled braking event.
A method of operating a vehicle brake system during a controlled braking event, the method comprising:
- determining that a controlled braking event is required;
- sensing a pressure of a fluid at a master cylinder;
- operating a pump;
- modulating a plurality of valves to alternatively decrease a pressure of the fluid at a brake and increase the pressure of the fluid at the brake to execute the controlled braking event;
- and
- reducing the pressure of the fluid at a master cylinder by using a volume manipulation device to cause a change in a capacity of the vehicle brake system during execution of the controlled braking event.
Dependencies are inferred from the claim text.