Control system for lean-burn internal combustion engine

Details Control system for lean-burn internal combustion engine Control system for lean-burn internal combustion engine

1994-10-06

1996-01-16

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Fuel injection system

477111, F02D 4110, B60K 4106

Patent

active

054839394

ABSTRACT:
ECU includes a lean air/fuel ratio coefficient setting device, an accelerated stoichiometric-burn operation air/fuel ratio coefficient setting device, a meeting-of-lean-burn-operation-conditions determining device, a throttle position change detector, an acceleration criterion setting device, an end-of-acceleration determining device and an acceleration determining device. When a detected vehicle speed has been determined to be in a high-speed range faster than a threshold and an acceleration is determined to have ended, a relatively large value is set as an acceleration criterion only for a predetermined period. During a lean-burn operation, ECU compares output information from the throttle position change detector with the acceleration criterion set by the acceleration criterion setting device and if the output information is greater than the acceleration criterion, determines an accelerated operation and changes the mixing ratio of fuel to air to a stoichiometric ratio (or a rich ratio). Otherwise, the air/fuel ratio is controlled at a lean ratio.

REFERENCES:
patent: 4383456 (1983-05-01), Ganoung
patent: 4739483 (1988-04-01), Ina et al.
patent: 4774858 (1988-10-01), Ganoung
patent: 4908765 (1990-03-01), Murakami et al.
patent: 4964318 (1990-10-01), Ganoung
patent: 5190008 (1993-03-01), Yamasaki et al.
patent: 5211147 (1993-05-01), Ward

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