Method of testing a set of wheel speed sensors forming parts of an anti-lock brake control system

摘要

A set of wheel speed sensors forming parts of an anti-lock brake control system are tested for proper connection and operation when mounted on a motor vehicle. A check signal is first input to a sensor check terminal connected to a control circuit included in the brake control system, thereby causing the control circuit to light a warning lamp. Then the wheels of the vehicle are successively rotated in a predefined sequence and at a speed corresponding to the lowest vehicle speed at which the brake control system must be active. If all the wheel speed sensors deliver their outputs to the control circuit in the predetermined sequence, the warning lamp goes out to indicate proper functioning and proper connection of the sensors. The warning lamp remains illuminated if one or more of the wheel speed signals are not input to the control circuit or if the wheel speed signals are received by the control circuit in other than the predetermined sequence.