Control of EGR in a closed loop EFI engine

Details Control of EGR in a closed loop EFI engine Control of EGR in a closed loop EFI engine

1978-10-30

1980-02-26

Cox, Ronald B.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

F02M 700

Patent

active

041900294

ABSTRACT:
System for controlling exhaust gas recirculation in an internal combustion engine having fuel supply means controlled by an electronic control unit. A sensor determines whether the air/fuel mixture of exhaust gases is above or below stoichiometric conditions to generate a feedback signal for the electronic control unit so as tend towards said stoichiometric conditions. Exhaust gas recirculation is controlled by an EGR valve responsive to a command signal. The command signal is equal to the sum of a first signal substantially equal to the control signal generated by an EGR program voltage plus a correction signal, and of a second square wave signal having a given frequency. The correction signal is a function of the amplitude of the frequency component of said feedback, having said given frequency.

REFERENCES:
patent: 3788284 (1974-01-01), Gardner
patent: 3872846 (1975-03-01), Taplin

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