Ignition timing control system for internal combustion engine

Internal-combustion engines – Combustion chamber means combined with air-fuel mixture...

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F02P 515

Patent

active

050708414

ABSTRACT:
An ignition timing control system of the vehicle internal combustion engines which conducts ignition timing control retard adjustment during vehicle acceleration so as to eliminate vibration of the vehicle body caused by the sudden change in the engine output. When the vehicle acceleration is detected, the ignition timing is immediately retarded for a period and after the expiration of the period, the retard adjustment is continued so long as the engine speed increases and discontinued when the engine speed turns to decreases. As a result of the repeated ignition timing control, the overall ignition timing characteristics take on a zigzag pattern. The ignition timing is thus controlled to reduce the output torque when the torque tends to rise because the engine speed is rising, while the retard correction is discontinued so as to prevent a decrease in output torque when the engine output torque tends to decline. As such, by deliberately imparting a phase difference to the output, the change in the engine speed is averaged to result smooth rising during acceleration without causing the vibration to the vehicle body.

REFERENCES:
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patent: 4852537 (1989-08-01), Nagano et al.
patent: 4870935 (1989-10-01), Araki
patent: 4887573 (1989-12-01), Fujiwara et al.
patent: 4896641 (1990-01-01), Nagano et al.
patent: 4909224 (1990-03-01), Nishiyama et al.
patent: 4987874 (1991-01-01), Katayama et al.

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