Ignition timing control apparatus for an internal combustion eng

Internal-combustion engines – Spark ignition timing control – Electronic control

Patent

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Details

74860, F02P 504

Patent

active

044845553

ABSTRACT:
A solenoid switching valve is arranged between an advance port near a throttle valve and a negative pressure advancing device which drives a governor advancing device in accordance with a magnitude of an intake negative pressure introduced from the advance port to advance an ignition timing. When a transmission gear is at a high speed gear position, when an engine coolant temperature is below a predetermined temperature or when an engine is operated under a light load condition, the advance port is communicated with the negative pressure advancing device through the solenoid switching valve. When the transmission gear is at other than the high speed gear position and the engine coolant temperature is above a predetermined temperature and the engine is operated under a high load condition, atmosphere is introduced into the negative pressure advancing device through the solenoid switching valve to forcibly suppress the operation of the negative pressure advancing device.

REFERENCES:
patent: 3584521 (1971-06-01), Tooker et al.
patent: 3923023 (1975-12-01), Ito et al.
patent: 4168691 (1979-09-01), Sawada et al.

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