Method for the operation of a hydraulic brake system with an integrated parking brake function for motor vehicles
OwnerBerhard Giersinventor
Life of this patent
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Abstract
Disclosed is a method for the operation of a hydraulic brake system with an integrated parking-brake function for motor vehicles having two vehicle axles. The system includes a pedal-operated pressure generator, at least one hydraulic pump, an operating element which is connected to an electronic control and regulation unit, and wheel brakes provided with inlet and outlet valves, with the wheel brakes associated with the second vehicle axle including a device for executing a parking-brake operation. To reduce noises caused by the hydraulic pump when initiating and terminating a parking-brake operation, the hydraulic pump is driven in such a fashion in the disclosed method that pressure build-up can be achieved at low noise.
Claims6
1-5. (canceled)
A method for operating a hydraulic brake system having an integrated parking-brake function for motor vehicles having at least two vehicle axles, the system including a pedal-operated pressure generator (31), at least one hydraulic pump (4), an operating element (12) which is connected to an electronic control and a regulation unit (9), and wheel brakes (2, 3) provided with inlet and outlet valves (13, 14, 17, 18), with the wheel brakes (2) associated with the second vehicle axle including a device for executing a parking-brake operation, the method comprising:
- driving the hydraulic pump (4) in such a fashion that a pressure that is necessary to initiate or terminate a parking-brake operation is built up with a minimum possible pressure-increase gradient.
The method according 9, wherein at least the following steps are performed in the transition from a service-brake operation to a parking-brake operation:
- I. Actuation of the operating element (12) by the operator;
- II. Closing the inlet valves (17) of the wheel brakes (3) associated with the first axle;
- III. Pressure build-up performed by the hydraulic pump (4) in the wheel brakes (2) associated with the second axle;
- IV. Closing the inlet valves (13) and opening the outlet valves (14) of the wheel brakes (2) associated with the second axle and activation of the means for performing a parking-brake operation.
Dependencies are inferred from the claim text.