Air-fuel ratio control system for internal combustion engines

Details Air-fuel ratio control system for internal combustion engines Air-fuel ratio control system for internal combustion engines

1997-04-04

1998-12-29

Denion, Thomas E.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60285, 123674, F01N 300

Patent

active

058529306

ABSTRACT:
An air-fuel control system for use with an internal combustion engine has a catalytic converter disposed in an exhaust system of the engine, for purifying an exhaust gas emitted from the engine, a first exhaust gas sensor disposed in the exhaust system for detecting an air-fuel ratio of the exhaust gas upstream of the catalytic converter, a second exhaust gas sensor disposed in the exhaust system for detecting the concentration of a component of the exhaust gas which has passed through the catalytic converter, downstream of the catalytic converter, and a control unit for controlling an air-fuel ratio of the engine based on outputs from the first exhaust gas sensor and the second exhaust gas sensor. The control unit includes an adaptive sliding mode controller for determining a correction quantity to correct the air-fuel ratio of the engine so as to equalize the concentration of the component of the exhaust gas downstream of the catalytic converter to a predetermined appropriate value, according to an adaptive sliding mode control process based on the output from the second exhaust gas sensor, and a feedback controller for controlling a rate at which fuel is supplied to the engine so as to converge the concentration of the component of the exhaust gas downstream of the catalytic converter toward the predetermined appropriate value, based on the correction quantity and the output from the first exhaust gas sensor.

REFERENCES:
patent: 5341641 (1994-08-01), Nakajima et al.
patent: 5392599 (1995-02-01), Hamburg et al.
patent: 5467593 (1995-11-01), Vincent et al.
patent: 5704339 (1998-01-01), Choe et al.

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