Method for operating a parking brake of a vehicle
AssigneeRobert Bosch GmbH
InventorsFrank Baehrle-Miller, Dieter Blattert, Simon Hauber, Tobias Putzer
Life of this patent
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Abstract
A method for operating a parking brake of a vehicle, in particular of a motor vehicle, which parking brake operates in the superposition mode, the brake force of the parking brake being applicable by two different force-generating actuators mutually supporting one another in the superposition mode. It is provided that the force-generating, in particular pressure-generating, actuator is activated for support even before the superposition.
Claims15
A method for operating a parking brake of a motor vehicle having a brake piston, the method comprising:
- activating a first force-generating actuator, which is a pressure-generating actuator, for support even before a superposition mode to prevent a pressure drop or to reduce the pressure drop;
- wherein the parking brake operates in the superposition mode, and the brake force of the parking brake is applicable via the first force-generating actuator having a first drive and a second force-generating actuator having a second drive, which mutually support one another against the brake piston in the superposition mode and the first drive is activated as a function of at least one of an electric voltage profile and a rotational speed profile of a second drive, which drives the second actuator.
A method for operating a parking brake of a motor vehicle having a brake piston, the method comprising:
- activating a force-generating actuator, which is a pressure-generating actuator, for support at a time period before a superposition mode to prevent a pressure drop or to reduce the pressure drop;
- wherein the parking brake operates in the superposition mode, and the brake force of the parking brake is applicable via two different force-generating actuators which mutually support one another against the brake piston in the superposition mode and the time period between activation and superposition is defined as a function of at least one of a temperature of a hydraulic fluid of the hydraulic actuator and an outside temperature is used as the temperature.
A control unit for operating a parking brake of a motor vehicle having a brake piston, comprising:
- an activating arrangement to activate a first force-generating actuator, which is a pressure-generating actuator, for support before a superposition mode to prevent a pressure drop or to reduce the pressure drop;
- wherein the parking brake operates in the superposition mode on the brake piston, and the brake force of the parking brake is applicable via the first force-generating actuator having a first drive and a second force-generating actuator having a second drive, which mutually support one another against the brake piston in the superposition mode and the first drive is activated as a function of at least one of an electric voltage profile and a rotational speed profile of a second drive, which drives the second actuator.
Dependencies are inferred from the claim text.