EGR control device for internal combustion engine

Details EGR control device for internal combustion engine EGR control device for internal combustion engine

1987-11-27

1988-12-13

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

F02M 2506

Patent

active

047902868

ABSTRACT:
An EGR device for an IC engine is disclosed which comprises an EGR control valve installed in an EGR passageway communicating with an exhaust system and an intake system of an internal combustion engine, an oxygen sensor for detecting the oxygen content of the intake air installed in the downstream of the opening of the EGR passageway in said intake system, a pressure sensor for detecting the atmospheric pressure in the oxygen sensor, and an EGR controller for computing a first quantity corresponding to a target exhaust gas reflux rate, correcting the output signal of the oxygen sensor using the output signal of the pressure sensor, and opening or shutting said EGR control valve in proportion to the deviation of the second quantity thus corrected from the first quantity in order to set the operating condition of the engine in conformity with a predetermined target EGR rate.

REFERENCES:
patent: 4005689 (1977-02-01), Barnard
patent: 4108122 (1978-08-01), Barnard
patent: 4168683 (1979-09-01), Hata et al.
patent: 4411242 (1983-10-01), Igashira et al.
patent: 4445489 (1984-05-01), Kobayashi et al.
patent: 4614175 (1986-09-01), Asayama
patent: 4705009 (1987-11-01), Asayama

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