Title: Fault detection for wheel slip control system

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Abstract: A fault detection system containing three modes of system shutdown, temporary, latching, or permanent disables an automotive wheel slip control system upon detecting faults in the speed sensors, control valves or interconnecting cables. Temporary shutdown is performed immediately following turn on and whenever certain supply voltages drop below threshold levels. Temporary shutdown is automatically terminated at the end of a predetermined time after turn on or when the supply voltages return to normal. Latching, resettable shutdown is performed in response to excessive apparent speed difference between a pair of wheels where the apparent difference endures too long. Latching shutdown is also performed in response to excessive actuation time of one or the other of two wheel slip control system solenoid valves and in response to actuation of a second solenoid valve in the absence of cycling of the first solenoid valve. Reset after latching shutdown is performed by removing and reapplying power to the fault detection system. Permanent shutdown is accomplished when cyclic sensor faults cause spurious operation and when solenoid energization is not terminated by inhibit signals generated during latching shutdown. Reset after permanent shutdown is accomplished by replacement of an external power supply fuse which is blown by the operation of the permanent shutdown function. All fault actuations provide energization signals of an external warning indicator and inhibition of external circuits.


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