Method and apparatus for controlling torque variations in an int

Details Method and apparatus for controlling torque variations in an int Method and apparatus for controlling torque variations in an int

1991-01-28

1991-10-29

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including means responsive to instantaneous change in engine...

123571, F02D 4104, F02M 2507

Patent

active

050606182

ABSTRACT:
In an internal combustion engine, a vibration period and a vibration amplitude are measured and the detected vibration period is compared with a natural vibration period prestored in accordance with a driving condition of the vehicle. If the detected vibration period is equal to the natural vibration period under the driving condition at which the vibration period is detected, it is determined that surging due to a torque variation of the engine is occurring. In this condition, the torque variation is controlled to be a predetermined value by increasing an air-fuel ratio or decreasing an amount of EGR when the detected vibration amplitude is smaller than a predetermined value, and the torque variation is controlled to a predetermined value by decreasing an air-fuel ratio or increasing an amount of EGR when the detected vibration amplitude is larger than a predetermined value, and accordingly, the driveability and emission rate are improved.

REFERENCES:
patent: 4557236 (1985-12-01), Showalter
patent: 4575800 (1986-03-01), Kittelson
patent: 4724813 (1988-02-01), Cinpinski
patent: 4776312 (1988-10-01), Yoshioka et al.
patent: 5016593 (1991-05-01), Takaoka
patent: 5021960 (1991-06-01), Manaka et al.

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