Air-fuel ratio control device for internal combustion engine

Details Air-fuel ratio control device for internal combustion engine Air-fuel ratio control device for internal combustion engine

1994-03-24

1996-01-23

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123494, F02D 4114

Patent

active

054858267

ABSTRACT:
An air-fuel ratio control device for an internal combustion engine having an intake passage and an exhaust passage with a three way catalytic converter. The device comprises a fuel injector for injecting fuel and an air-fuel ratio detector for detecting an air-fuel ratio in the engine cylinder, which is arranged in the exhaust passage upstream of the three way catalytic converter. A first estimation device estimates an amount of intake air actually fed into the engine cylinder. A first decision device decides a target amount of fuel which must be fed into the engine cylinder to realize the stoichiometric air-fuel ratio, on the basis of the amount of intake air estimated by the first estimation device. A second estimation device estimates an amount of fuel actually fed into the engine cylinder, on the basis of the air-fuel ratio detected by the air-fuel ratio detector, and the amount of intake air estimated by the first estimation device. A second decision device decides an amount of fuel actually injected by the fuel injector such that a difference between the amount of fuel estimated by the second estimation device and the target amount of fuel decided by the first decision device, and a time integration value of the difference are made to converge to "0" at the same time.

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patent: 5190020 (1993-03-01), Cho
patent: 5207056 (1993-05-01), Benninger
patent: 5329914 (1994-07-01), Togai et al.
patent: 5363648 (1994-11-01), Akazaki et al.

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