Communications: electrical – Selective – Having indication or alarm
Patent
1979-11-09
1981-08-18
Caldwell, Sr., John W.
Communications: electrical
Selective
Having indication or alarm
200 56R, 235 97, 235132E, 307 10R, 338 67, 338 92, 338127, 340688, B60Q 100, G01D 1300, G08B 500
Patent
active
042849721
ABSTRACT:
An apparatus for providing a service reminder when a vehicle has accumulated a predetermined mileage comprises a potentiometer operated by the highest order number wheel of the vehicle odometer to provide an output voltage which changes incrementally with each indexing motion of that number wheel. An electrical detector responsive to the potentiometer output energizes a signal lamp when the output reaches a voltage in a predetermined range representing a desired service interval. An electrical connector in circuit with the potentiometer can be disconnected to change the potentiometer voltage to a value outside the predetermined range to allow the service reminder circuit to turn off the indicator lamp when the indicated service has been performed. The apparatus is adapted to operate in conjunction with an electronic engine control module which can be programmed to detect the predetermined value of the potentiometer output and to operate a signal lamp. The potentiometer output in addition provides information to the electronic control module on the accumulated mileage of the vehicle.
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Chiu Randolph K.
Cox Francis G.
Stiff Douglas A.
Caldwell Sr. John W.
General Motors Corporation
Hill Warren D.
Nowicki Joseph E.
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