Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1987-05-27
1989-05-30
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Fuel injection system
123432, F02P 515
Patent
active
048340472
ABSTRACT:
A spark-ignition internal combustion engine having an intake passageway diverging into first and second intake passage portions leading to combustion chambers of the engine. A blocking valve is movably disposed in the second intake passage portion and be adapted to close in a low engine load operating range while open in a high engine load operating range. The engine is provided with a control unit for controlling operation of the blocking valve and of a spark plug for each combustion chamber. Under the action of the control unit, spark timing of the spark plug is controlled to be advanced in the high engine load operating range relative to that in the low engine load operating range. Additionally, degree of such spark timing advance is reduced during a transition time period from initiation to completion of opening operation of the blocking valve. Degree of such spark timing advance reduction is controlled to vary with time lapse during the transition time period. Such control suppresses phenomena of too early spark timing during the transition time period, thereby preventing engine knock.
REFERENCES:
patent: 4237828 (1980-12-01), Sugiyama
patent: 4532902 (1985-08-01), Mizuno
patent: 4592315 (1986-06-01), Kobayashi
Argenbright Tony M.
Nissan Motor Co,. Ltd.
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