Idle speed control for DISI engines

Details Idle speed control for DISI engines Idle speed control for DISI engines

1997-10-16

1999-04-20

Kwon, John

Internal-combustion engines

Engine speed regulator

Idle speed control

12333919, 12333911, F02M 300

Patent

active

058948287

ABSTRACT:
An idle speed control system for a direct injection spark ignition engine controlled to operate in either homogeneous air/fuel modes or stratified air/fuel modes. A desired idle speed is set to optimize fuel economy and avoid rough engine operation during various air/fuel operating modes. During rough idle conditions and non stoichiometric air/fuel operation engine air/fuel is enriched until either rough idle ceases or a rich air/fuel limit is reached. During smooth idle operation, and non stoichiometric air/fuel operation, engine air/fuel is enleaned until either rough idle occurs, a lean air/fuel limit reached, or desired fuel economy attained. After the lean limit is reached, and when operating in a non-stoichiometric non-stratified air/fuel mode, and when not operating at desired fuel economy, ignition timing is advanced until an advance limit is reached and desired idle speed is thereafter decreased.

REFERENCES:
patent: 4305360 (1981-12-01), Meyer et al.
patent: 5018494 (1991-05-01), Sonoda et al.
patent: 5203300 (1993-04-01), Orzel
patent: 5497745 (1996-03-01), Cullen et al.
patent: 5630394 (1997-05-01), Grizzle et al.
patent: 5727522 (1998-03-01), Otani et al.

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