Patent ID: 9028011
Filing Date: 2015-05-12
Classification: B60T

Abstract:
1. A method for operating a parking brake module in an event of a defect that increases a pressure level in the parking brake module beyond a normal supply pressure of the parking brake module, the parking brake module being at least partially integrated into a compressed air generation system having a cut-out pressure, the parking brake module having an electronic control unit, a plurality of solenoid valves for supplying a control pressure for actuation of the parking brake module, and a relay valve receiving the control pressure for ventilation and venting of at least one spring brake cylinder, the method comprising the acts of: detecting the pressure level in the parking brake module in excess of the normal supply pressure of the parking brake module; interrupting an ongoing compressed air delivery; setting the cut-out pressure of the compressed air generation system from an original high cut-out pressure to a reduced cut-out pressure that is lower than the original cut-out pressure; and reducing the pressure level in the parking brake module to the reduced cut-out pressure, wherein repeated activation of the relay valve reduces the pressure level in the parking brake module to the reduced cut-out pressure.