Controller of internal combustion engine

Details Controller of internal combustion engine Controller of internal combustion engine

2007-10-12

2009-10-06

Kwon, John T (Department: 3747)

Internal-combustion engines

Charge forming device

C123S435000, C123S677000

Reexamination Certificate

active

07597087

ABSTRACT:
An engine controller performs low opening degree control during a first intake stroke period since an engine start is commenced until first intake strokes of respective cylinders end. Thus, an opening degree of an intake throttle valve is controlled to a fully closed position or proximity of the fully closed position such that intake pressure downstream of the intake throttle valve becomes equal to or lower than critical pressure with respect to intake pressure upstream of the intake throttle valve during an intake stroke of each cylinder. The controller calculates a leak air quantity at the time when the intake throttle valve is fully closed based on an intake air quantity sensed during the low opening degree control. The controller corrects a feedback gain of idle speed control in accordance with the leak air quantity of the intake throttle valve.

REFERENCES:
patent: 4879983 (1989-11-01), Shimomura et al.
patent: 5007399 (1991-04-01), Nakaniwa
patent: 5070837 (1991-12-01), Nishimura et al.
patent: 5126943 (1992-06-01), Nakaniwa
patent: 04-043847 (1992-02-01), None
patent: 05-288101 (1993-11-01), None
patent: 09-170474 (1997-06-01), None

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