Method for precharging a low-pressure accumulator of a motor vehicle braking system
AssigneeRobert Bosch GmbH
InventorAlexander Bareiss
Life of this patent
Estimating the term…
Abstract
A method for pre-filling a low-pressure storage device of a motor vehicle braking system, having a changeover valve, a hydraulic pump, an outlet valve, and a low-pressure storage device situated in a suction line of the hydraulic pump. The low-pressure storage device can be pre-filled in a particularly simple and low-noise manner if the actuation of the foot brake pedal is monitored using a sensor mechanism and, when there is an actuation, the changeover valve is closed in order to lock in the braking pressure acting on the wheel brake, and at least one of the outlet valves is opened in order to release the braking pressure into the low-pressure storage device.
Claims12
A method for pre-filling a low-pressure storage device of a motor vehicle brake system including a valve situated between a brake master cylinder and a wheel brake, an outlet valve situated after the wheel brake, and the low-pressure storage device situated in a suction line of a hydraulic pump, the method comprising:
- prior to ignition of the motor vehicle, building up a braking pressure through an actuation of a foot brake pedal;
- closing the valve in order to lock-in a braking pressure acting on the wheel brake;
- and
- opening the outlet valve in order to release a braking pressure into the low-pressure storage device.
A braking system for a motor vehicle, comprising:
- a valve situated between a brake master cylinder and a wheel brake;
- an outlet valve situated after the wheel brake;
- a hydraulic pump;
- a low-pressure storage device situated in a suction line of the hydraulic pump;
- and
- a control device for controlling the hydraulic pump and the valves, wherein the control device controls a pre-filling of the low-pressure storage device in which an actuation of a foot brake pedal is recognized by a sensor mechanism prior to ignition of the motor vehicle, and, in the case of an actuation, the valve is closed in order to lock-in a braking pressure acting on the wheel brake, and the outlet valve is opened in order to release a braking pressure into the low-pressure storage device.
A method for pre-filling a low-pressure storage device of a motor vehicle brake system including an inlet valve situated between a brake master cylinder and a wheel brake, an outlet valve situated after the wheel brake, and the low-pressure storage device situated in a suction line of a hydraulic pump, the method comprising:
- closing the inlet valve in order to lock in the brake pressure, if all of the following conditions are satisfied:
- an ignition of the motor being switched off, the motor vehicle being at a standstill, a manual brake pedal being actuated, and a brake pressure exceeding a predetermined threshold value;
- opening the outlet valve to release the brake pressure into the low-pressure storage device, in response to the ignition of the motor being switched on and the manual brake pedal no longer being actuated;
- and
- responsive to a filling state of the low-pressure storage device exceeding a predetermined level, closing the outlet valve and opening the inlet valve.
Dependencies are inferred from the claim text.