Internal-combustion engines – Engine speed regulator – Having plural throttle valve structure
Patent
1990-11-15
1992-06-16
Nelli, Raymond A.
Internal-combustion engines
Engine speed regulator
Having plural throttle valve structure
F02D 900
Patent
active
051217244
ABSTRACT:
A throttle is disposed in the intake port per cylinder. At idle, the throttles are closed. The pressure in the intake port per cylinder increases during the intake valve closed period due to flow admitted to the intake port downstream of the throttle until it recovers to ambient before the valve overlap period. The flow rate is controlled individually per cylinder such that it is higher during the intake valve closed period than it is during the intake valve opened period. This allows the increased valve overlap to be used without increasing the residual mass fraction in the cylinder. As a result, the stability engine operation at idle and part load range is improved.
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Abo Toshimi
Anzai Makoto
Nelli Raymond A.
Nissan Motor Company Ltd.
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