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

1996-12-11

1998-12-08

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Fuel injection system

123694, F02D 4114, F02D 4130

Patent

active

058456244

ABSTRACT:
In an air-fuel ratio control system for an internal combustion engine, a fuel injection amount to be injected from a fuel injector is set based on a monitored operating condition of the engine. The fuel injector injects a corresponding amount of fuel to the engine. An air-fuel ratio sensor monitors exhaust gas discharged from the engine and detects an air-fuel ratio. The system derives an injector sensitivity based on a current fuel injection amount and an output of the air-fuel ratio sensor and further derives, as an injector sensitivity deviation, a ratio between the derived injector sensitivity and an injector sensitivity estimated upon designing the system. The system further derives a sensitivity correction term based on the derived injector sensitivity deviation so as to correct the injector sensitivity. The system may also correct an air-fuel ratio sensor sensitivity in a similar manner.

REFERENCES:
patent: 4190022 (1980-02-01), Long
patent: 4869222 (1989-09-01), Klassen
patent: 4903669 (1990-02-01), Groff et al.

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