Air fuel ratio control apparatus for an internal combustion engi

Details Air fuel ratio control apparatus for an internal combustion engi Air fuel ratio control apparatus for an internal combustion engi

1994-12-30

1996-02-20

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

F02D 4114

Patent

active

054921074

ABSTRACT:
An air-fuel ratio feedback correction coefficient is controlled proportionally and integrally based on the oxygen density of the exhaust gas as detected by an oxygen sensor. The oxygen sensor has decreased response characteristics at low temperatures. When the ignition switch is switched on, a heater in the oxygen sensor is turned on and an initial value KLMDo of a correction value is set based on engine water temperature Tw. The initial value is in turn gradually increased over time and converges to 1.0. Excessive control amplitudes during cold engine starting are thus avoided by compensation for the oxygen sensor temperature condition.

REFERENCES:
patent: 4475517 (1984-10-01), Kobayashi et al.
patent: 4721088 (1988-01-01), Mieno et al.
patent: 4763628 (1988-08-01), Mieno et al.

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