Air-fuel ratio control system for internal combustion engine

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

1993-10-12

1995-02-21

Lazarus, Ira S.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60285, F01N 320

Patent

active

053904893

ABSTRACT:
An air-fuel ratio control system for an internal combustion engine uses a dynamic model which is set as an approximation to a controlled object. The controlled object covers an operation sequence from a fuel injection valve to an air-fuel ratio sensor which is provided downstream of a catalytic converter for detecting an actual air-fuel ratio based on the exhaust gas downstream of the catalytic converter. The system derives a fuel injection amount to be fed to the engine by performing a state-feedback control in such a manner as to control the actual air-fuel ratio to a target air-fuel ratio. The system performs the state-feedback control using, as state variables, current and past input and output data relative to the dynamic model. Accordingly, the actual air-fuel ratio monitored on the downstream-side of the catalytic converter is controlled to the target air-fuel ratio without delay by directly deriving the fuel injection amount using the state-feedback control.

REFERENCES:
patent: 4027477 (1977-06-01), Storey
patent: 4625697 (1986-12-01), Hosaka
patent: 5090199 (1992-02-01), Ikuta et al.

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