G - Physics – 01 – L
Patent
G - Physics
01
L
340/47
G01L 19/00 (2006.01) G07C 5/00 (2006.01)
Patent
CA 1204187
-31- ENGINE PARAMETER MONITORING SYSTEM Abstract System for monitoring an engine operating parameter, such as oil pressure, which varies in proportion to engine speed, monitors the parameter relative to an upper and lower setpoint. Oil pressure is sensed by a transducer and the sensed pressure is monitored by a pair of comparators which compare the sensed oil pressure with reference voltages corresponding to the upper and lower setpoints. The reference voltages may be selectively altered by a switch in order to change the pressure setpoints. The outputs of the comparators control an annunciator which indicates when the monitored pressure is below either of the setpoints. A circuit is provided to inhibit operation of the annunciator by the comparators monitoring pressure relative to the upper setpoint when the engine's speed is below a predetermined value. The output of the comparator monitoring pressure relative to the lower setpoint controls a service-hour meter to provide an indication of the total elapsed time that the engine is running.
444438
Fuzzell Joseph E.
Pflederer Mark R.
Robinson Tommy E.
Caterpillar Tractor Co.
Kirby Eades Gale Baker
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