B - Operations – Transporting – 60 – Q
Patent
B - Operations, Transporting
60
Q
342/37, 340/48
B60Q 1/00 (2006.01) B60T 13/14 (2006.01) B60T 17/22 (2006.01) G08B 5/22 (2006.01)
Patent
CA 1319404
D-4387 BRAKE SYSTEM WARNING CIRCUIT ABSTRACT OF THE DISCLOSURE A failure warning device is provided for use with an auxiliary pump unit made ready by either an ignition-on signal or a brake- on signal and activated by a pump-failure signal. The failure warning device has a monitor circuit coupled to a warning circuit. For maintaining reliability of the auxiliary pump unit, the module circuitry is wired as a monitor not including circuit components of the auxiliary pump unit. It has a first input coupled to a common ready signal produced by the pump unit and a second input coupled to a motor terminal of the pump unit. The monitor circuit responds to failure-related states of the ready signal and the motor terminal impedance and voltage by generating an anomaly signal. The alarm circuit switches on an alarm, such as a buzzer and light, when it receives both the ignition-on and anomaly signals. The monitor circuit can include a circuit for generating the anomaly signal when a comparator detects a difference between the brake-on signal and a simultaneously activated brake stop light signal. The monitor can also include a circuit to activate the alarm if a brake circuit detector senses a brake circuit failure.
572371
Didier Gregory S.
Roussey James L.
Finlayson & Singlehurst
Navistar International Transportation Corp.
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