Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1989-11-02
1990-07-17
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Fuel injection system
123479, 123630, 123643, F02D 4122, F02P 515, F02P 1100
Patent
active
049414453
ABSTRACT:
An improved electronic position sensor assembly and engine control system is provided in which two sensing elements in a dual sensor provide separate, independent position signals related to multi-cylinder engine cycle position by sensing the angular position of a engine-rotated slotted wheel. The sensing elements provide identical sensing signals shifted from each other by a predetermined angular amount. In response to the simultaneous occurrence of a pulse by both sensing elements, a first reference signal identifying a reference cylinder is provided for controlling electronic distribution of either spark timing and/or fuel injection signals to the various engine cylinders. In response to one of the sensing elements producing a pulse which has a predetermined longer duration than a preceding produced pulse, a second reference signal is produced indicative of top-dead center engine cylinder cycle position for one of the cylinders. In response to detecting a fault in one of the position signals produced by said sensing elements, a switch selects the other of said sensing elements for utilization in producing said second reference signal, and a substitute reference signal means provides a substitute first reference signal. A less expensive and more reliable engine position sensor assembly and engine control system is provided since proper system operation is maintained despite a fault in one of said sensing signals.
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Advertisement for Motorola New Dual Optointerrupter, no date.
Argenbright Tony M.
Melamed Phillip H.
Motorola Inc.
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