Apparatus for controlling air/fuel ratio of internal combustion

Details Apparatus for controlling air/fuel ratio of internal combustion Apparatus for controlling air/fuel ratio of internal combustion

1990-06-27

1991-07-23

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Fuel injection system

123440, F02M 5100

Patent

active

050334409

ABSTRACT:
An apparatus is provided for controlling the air/fuel ratio of an internal combustion engine. The apparatus includes a sensor disposed in an exhaust system for detecting components of exhaust gas, a device for compulsorily changing the air/fuel ratio, another device for setting a first target value which gives a target air/fuel ratio to be compared with each output from the sensor, and a further device for controlling the air/fuel ratio, which has been compulsorily changed by the air/fuel ratio changing device, on the basis of the result of a comparison between the output and the first target value, whereby the average air/fuel ratio may be controlled to the first target air/fuel ratio. The first target value setting device includes an element for modifying the first target value to a second target value, which gives a leaner air/fuel ratio, in a specific operation state of the engine.

REFERENCES:
patent: 4854287 (1989-08-01), Tomisawa
patent: 4860712 (1989-08-01), Nakajima et al.
patent: 4878473 (1989-11-01), Nakinawa et al.
patent: 4889099 (1989-12-01), Tomishawa
patent: 4913120 (1990-04-01), Fujimoto et al.
patent: 4932383 (1990-01-01), Zechnall et al.
patent: 4932384 (1990-06-01), Woingartnar
patent: 4964271 (1988-03-01), Sawada et al.

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