Air-fuel ratio control apparatus for internal combustion engines

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

1996-08-08

1998-06-30

Wolfe, Willis R.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

123676, 123681, F02D 4114, F01N 320

Patent

active

057716889

ABSTRACT:
On an exhaust pipe of an internal combustion engine, an A/F sensor is disposed at an upstream side of a three-way catalyst and a downstream side O.sub.2 sensor is disposed on a downstream side thereof. A CPU determines according to an exhaust gas temperature whether the operational state of the engine is in a high load. In an early stage of the engine operation of high load, CPU sets a "rich" side target air-fuel ratio within a range that enables the downstream side O.sub.2 sensor to make linear detection of air-fuel ratio and executes feedback control of air-fuel ratio by using the set target air-fuel ratio. Also, when the level of the load has increased, CPU sets a "rich" side target air-fuel ratio according to the exhaust gas temperature and executes feedback control of air-fuel ratio by using the set target air-fuel ratio. Further, when the "rich" width deviates from a range that enables the A/F sensor to make its detection, CPU performs open-loop control with respect to the increment in fuel.

REFERENCES:
patent: 4528961 (1985-07-01), Katoh et al.
patent: 4561403 (1985-12-01), Oyama et al.
patent: 4993393 (1991-02-01), Hosoda et al.
patent: 5072712 (1991-12-01), Steinbrenner et al.
patent: 5103791 (1992-04-01), Tomisawa
patent: 5450836 (1995-09-01), Kashiwabara
patent: 5507269 (1996-04-01), Morikawa

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