Closed loop fuel control system for an internal combustion engin

Details Closed loop fuel control system for an internal combustion engin Closed loop fuel control system for an internal combustion engin

1980-03-17

1981-09-22

Cox, Ronald B.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

F02B 3300, F02M 700

Patent

active

042904005

ABSTRACT:
A closed loop fuel control system for an internal combustion engine is responsive to the output of a sensor monitoring the air/fuel ratio of the exhaust gases in the exhaust gas passage from the engine and therefore, after a transport time delay period dependent upon engine operating conditions, to the air/fuel ratio of the mixture supplied to the intake space of the engine and generates a first signal having a value preset to zero at each change in the sense of deviation of the sensed air/fuel ratio from a stoichiometric ratio and varying thereafter at a predetermined rate dependent upon the transport time delay and a second signal having a constant value for the period of the transport time delay after a change in the sense of deviation of the air/fuel ratio from a stoichiometric ratio and thereafter varying at the predetermined rate and in a sense determined by the sense of deviation of the air/fuel ratio from the predetermined ratio. The controller adjusts the air/fuel ratio of the mixture supplied to the engine in accord with the sum of the first and second signals and in a direction tending to produce the stoichiometric ratio.

REFERENCES:
patent: 4123999 (1978-11-01), Asano
patent: 4210106 (1980-07-01), Wessel
patent: 4241710 (1980-12-01), Peterson
patent: 4244340 (1981-01-01), Herth

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