Method for determining a triggering condition for recalibration of an automatic parking brake

摘要

A method for determining a triggering condition for recalibration in an automatic parking brake includes determining a motor current which is expected at a predetermined time during a release process of the automatic parking brake. The method includes identifying motor current for a brake motor in the automatic parking brake that generates an electromechanical braking force during operation and releases the electromechanical braking force during the release process.

主权项

1. A method for operating a brake system comprising:
determining, with a control unit, maximum motor current expected through a brake motor in the brake system at a predetermined time based on the following formula: IMax(e−t/τ)+IL where IMax is a predetermined maximum current at a start of a switch-on current surge for activation of the brake motor, t is the predetermined time, τ is predetermined mechanical time constant of the brake motor, and IL is a predetermined no-load current through the brake motor; supplying electrical power to the brake motor for a time period being prior to the predetermined time and continuing through the predetermined time; measuring an actual motor current through the brake motor at the predetermined time; and triggering, with the control unit, a recalibration process for the brake motor only in response to the actual motor current being less than the maximum motor current expected at the predetermined time.