Electricity: measuring and testing – Internal-combustion engine ignition system or device – Ignition timing
Patent
1990-11-02
1993-02-02
Harvey, Jack B.
Electricity: measuring and testing
Internal-combustion engine ignition system or device
Ignition timing
324385, 123414, 123613, F02P 1700
Patent
active
051840804
ABSTRACT:
A test and maintenance method and apparatus for an ignition system of an internal combustion engine, such as an outboard marine engine, which includes an advanced timing schedule, a nonadvanced timing schedule, and a circuit for switching between the two schedules or disabling both schedules based upon engine operating conditions. The ignition system includes an opto-electronic time base generator which produces two sets of timing pulses relative to crankshaft position which are nonadvanced timing pulses and advanced timing pulses. The time base generator comprises two LED phototransistor pairs and an encoder disk attached to the crankshaft with slots to interrupt the radiation path between each LED-phototransistor pair. The encoder disk is provided with a synchronizing slot, multiple timing slots associated with the cylinders of the engine, and a direction slot. The test function of the apparatus verifies the timing and sequence of timing pulses. The maintenance function of the apparatus provides a visual indication of reference locations such that the engine may be timed statically.
REFERENCES:
patent: 3866120 (1975-02-01), Ford
patent: 4445087 (1984-04-01), Mehnert
patent: 4494518 (1985-01-01), Katayama et al.
patent: 4553426 (1985-11-01), Capurka
patent: 4656993 (1987-04-01), Yuzawa et al.
patent: 4766865 (1988-08-01), Hartel
patent: 4858585 (1989-08-01), Remmers
Brown Glenn W.
Harvey Jack B.
Outboard Marine Corporation
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