Method and system for controlling a motor vehicle parking brake during a stop
AssigneeLucas Automotive GmbH
InventorsThomas Straub, Leo Gilles, Ralf Leiter
Life of this patent
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Abstract
A method and a system for controlling a parking brake of a motor vehicle are described. According to the described method, an ignition signal and an actuation state of the parking brake are detected. An application force of the parking brake is then set to a first value in dependence upon the actuation state of the parking brake if the ignition signal is present. If the parking brake was previously in an applied actuation state, the application force is reduced from a second value to the first value. If the parking brake was previously in a released actuation state, the application force is increased to the first value. The first value is sufficient to hold the motor vehicle in its current position.
Claims16
A method of controlling a parking brake of a motor vehicle during a stop, comprising the following steps:
- detecting an ignition signal;
- detecting an actuation state of the parking brake during the stop, wherein the actuation state of the parking brake is one of an applied actuation state in which the parking brake is applied and a released actuation state in which the parking brake is released;
- and
- setting an application force of the parking brake to a first value in dependence upon the actuation state of the parking brake when the ignition signal is present and the vehicle is stopped but not parked,
- setting the application force of the parking brake to a second value when the vehicle is parked, wherein the application force is increased from the first value to the second value when the ignition signal is no longer present,
- wherein the first value is lower than the second value, the first value being set to be sufficient to hold the motor vehicle in a current position, and
- detecting a signal corresponding to a driver request to close the parking brake, wherein if the signal corresponding to the driver request is present, the application force of the parking brake is increased to the first value or the second value depending on the actual actuation state of the parking brake and/or when the ignition signal changes from an absent state to a present state, reducing the application force in the applied actuation state of the parking brake from the second value to the first value solely by an electronic control device, such that the application force of the parking brake is changed from the second value to the first value smaller than the second value and the first value being set to be sufficient to hold the motor vehicle in the current position.
A system for controlling a parking brake of a motor vehicle during a stop, comprising an ignition sensor for detecting an ignition signal, a parking brake sensor for detecting an actuation state of the parking brake during a stop, wherein the actuation state of the parking brake is one of an applied actuation state in which the parking brake is applied and a released actuation state in which the parking brake is released, an application force setting device for setting an application force of the parking brake to a first value in dependence upon the actuation state of the parking brake when the ignition signal is present and the vehicle is stopped but not parked, setting the application force of the parking brake to a second value when the vehicle is parked, wherein the application force is increased from the first value to the second value when the ignition signal is no longer present, wherein the first value is lower than the second value, the first value being set to be sufficient to hold the vehicle in a current position, and an electronic control device that detects a signal corresponding to a driver request to close the parking brake, wherein if the signal corresponding to the driver request is present, the application force of the parking brake is increased to the first value or the second value depending on the actual actuation state of the parking brake and/or when the ignition signal changes from an absent state to a present state, and reduces the application force in the applied actuation state of the parking brake from the second value to the first value solely by an electronic control device, such that the application force of the parking brake is changed from the second value to the first value smaller than the second value and the first value being set to be sufficient to hold the motor vehicle in the current position.
Dependencies are inferred from the claim text.