Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1987-04-08
1989-07-04
Orsino, Joseph A.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
188 111, B60Q 100
Patent
active
048454630
ABSTRACT:
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.
REFERENCES:
patent: 3872425 (1975-03-01), Kobayashi
patent: 3995711 (1976-12-01), Kittle
patent: 4025781 (1977-05-01), Brearley
patent: 4262278 (1981-04-01), Howard et al.
patent: 4290045 (1981-09-01), Killinger
patent: 4290060 (1981-09-01), Eppley
patent: 4345660 (1982-08-01), Miller
Didier Gregory S.
Roussey James L.
AuBuchon F. David
Jackson Jill D.
Navistar International Transportation Corp.
Orsino Joseph A.
Sullivan Dennis K.
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