A/F ratio control system for internal combustion engine

Details A/F ratio control system for internal combustion engine A/F ratio control system for internal combustion engine

1993-12-27

1994-11-15

Lazarus, Ira S.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60285, 123703, F01N 322

Patent

active

053636481

ABSTRACT:
A system for controlling an air/fuel ratio of a four-cylinder internal combustion engine. In the system, an actual air/fuel ratio, at least at upstream or downstream of a catalytic converter installed at an exhaust system of the engine, is intentionally oscillated at least either in its amplitude or cycle. A characteristic of a desired air/fuel ratio as a periodic function is established with respect to time such that the desired air/fuel ratio varies at least either at a predetermined amplitude or cycle within a predetermined period. The characteristic is sampled by a time interval determined on the basis of a time interval between TDC crank angle positions of the engine. Each cylinder's desired air/fuel ratio is then determined from the sampled data, and a fuel injection amount for each cylinder is determined from the respective cylinder's desired air/fuel ratios. Fuel is then supplied to each cylinder in response to the determined fuel injection amount. The actual air/fuel ratio at each cylinder is detected or estimated and feedback controlled to the desired air/fuel ratio.

REFERENCES:
patent: 5074113 (1991-12-01), Matsuoka
patent: 5119628 (1992-06-01), Uema
patent: 5154055 (1992-10-01), Nakane
patent: 5158063 (1992-10-01), Hosoda

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