Engine control system and method

Details Engine control system and method Engine control system and method

1996-09-23

1998-03-17

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

F02D 4110

Patent

active

057275360

ABSTRACT:
A feedback control system and method for operating an internal combustion engine to provide the desired air/fuel ratio under all running conditions. The feedback control operates to modify the fuel/air ratio from that achieved by a basic setting that is derived from parameters of engine performance so as to maintain the desired ratio. The feedback control adjusts the air/fuel ratio in two different modes. In a first, normal operation mode, the feedback control adjusts the air/fuel mixture supplied to all cylinders based upon feedback from a sensor connected to a single of the cylinders. In a second operational mode, when the speed of the engine is accelerating, the feedback control determines and adjusts the air/fuel mixture, but makes adjustments to all cylinders except the sensed cylinder independent of the output of the sensor. In addition, when rich adjustments to the air/fuel ratio are made, the feedback control either increases the duration of the fuel pulse or adds fuel in one or more pulses spaced in time from the base fuel pulse.

REFERENCES:
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patent: 4627402 (1986-12-01), Saito et al.
patent: 4628883 (1986-12-01), Kataoka
patent: 4729362 (1988-03-01), Mori
patent: 5241939 (1993-09-01), Nonaka
patent: 5251602 (1993-10-01), Kurihara et al.
patent: 5337722 (1994-08-01), Kurihara et al.

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