Air-fuel mixture control for automobile engine having fuel injec

Details Air-fuel mixture control for automobile engine having fuel injec Air-fuel mixture control for automobile engine having fuel injec

1981-08-20

1983-08-23

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Fuel injection system

123568, 123571, F02M 2506, F02B 308, F02D 1700

Patent

active

043997910

ABSTRACT:
An air-fuel ratio control system for an automobile engine of a type having a fuel injection system wherein at least two of parameters including the engine speed, the opening of a throttle valve and the negative pressure developed inside a fuel intake passage are utilized to detect the rate of flow of incoming air to be mixed with an injected mist of fuel to form a combustible mixture. The fuel injection system includes a fuel adjusting device so designed as to provide, when the engine operates within a particular operating region, the combustible mixture of an air-fuel mixing ratio lower than that to be supplied to the engine when the latter operates within the other operating region than the particular operating region. The control system comprises a first EGR control device for controlling an EGR control valve according to a control value stored in a memory when the engine operates within the particular operating region and a second EGR control device operable when the engine operates within the other operating region for controlling the EGR control valve in dependence on the concentration of a component of exhaust gases sensed by a composition sensor.

REFERENCES:
patent: 4163435 (1979-08-01), Nakajima et al.
patent: 4214563 (1980-07-01), Heraka
patent: 4224912 (1980-09-01), Taoraka
patent: 4289108 (1981-09-01), Shioyama
patent: 4304210 (1981-12-01), Hayakawa
patent: 4337740 (1982-07-01), Sigarawa et al.

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