Patent ID: 6729363
Filing Date: 2004-05-04
Classification: B60C,B60G,B60S

Abstract:
A method for filling a tire of a spare wheel utilizing an air supply unit of an air spring system of a motor vehicle equipped with a tire filling system including a tire-fill connection unit and a fill unit, said method comprising the steps of:in a fault-free condition, changing the logic states of the inputs (32a, 32b) of a reed switch connected to a control apparatus from low/high to high/low when said tire-fill connection unit is attached; in a fault-free condition, changing the logic states of the inputs (32a, 32b) from high/low to low/high when disconnecting said tire-fill connection unit; said control apparatus functioning to detect high/high and, when said high/high is detected, then concluding either the third input (32c) has undergone a short circuit to positive or the second input (32b) has undergone a line interruption or short circuit to positive which cannot be diagnosed when said tire-fill connection unit is not attached; and, said control apparatus functioning to detect low/low and, when said low/low is detected, then concluding that either the second input (32b) or the third input (32c) has a short circuit to ground which can be diagnosed when said tire-fill connecting unit is not mechanically attached and the fill operation can be started when only one of said first and second inputs (32a, 32b) changes its logic state.