Internal-combustion engines – Spark ignition timing control – Electronic control
Patent
1985-08-23
1986-09-02
Wolfe, Jr., Willis R.
Internal-combustion engines
Spark ignition timing control
Electronic control
123571, F02P 510, F02M 2506
Patent
active
046089551
ABSTRACT:
An ignition timing control system with an exhaust gas recirculation (EGR) system has a primary vacuum-advance mechanism operated by vacuum in an intake passage of an engine to advance the ignition timing of the engine, and a secondary vacuum-advance mechanism operated by vacuum in the intake passage to advance the ignition timing in addition to the operation of the primary vacuum-advance mechanism. A first solenoid operated valve is provided to render the secondary vacuum-advance mechanism inoperative. A second solenoid operated valve is provided for cutting off the EGR system. An electronic control unit responds to engine operating conditions in a low engine speed range except idling operation for closing the first and second solenoid operated valve to cut off the EGR system and to cut off the secondary vacuum-advance mechanism, thereby stopping the advancing of the ignition timing.
REFERENCES:
patent: 4083335 (1978-04-01), Ohata
patent: 4098245 (1978-07-01), Ohata
patent: 4306533 (1981-12-01), Matsumoto et al.
patent: 4454854 (1984-06-01), Gotoh et al.
patent: 4467673 (1984-08-01), Hamada et al.
Hara Kazuo
Ohtaki Kiyoshi
Farber Martin A.
Fuji Jukogyo Kabushiki Kaisha
Wolfe, Jr. Willis R.
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