Electronic control system for carburetor and control method ther

Details Electronic control system for carburetor and control method ther Electronic control system for carburetor and control method ther

1982-10-27

1985-02-05

Lall, Parshotam S.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

123489, 123491, F02M 5100

Patent

active

044972962

ABSTRACT:
A control system for an electronically controlled carburetor operative during engine start-up employs an oxygen-concentration (O.sub.2) sensor which is accurate only a given engine temperature range. Engine temperature in the vicinity of the O.sub.2 sensor is compared to a predetermined threshold to determine whether the O.sub.2 sensor is sufficiently warm. When the O.sub.2 sensor is cold, the carburetor is controlled via an OPEN LOOP method wherein the carburetor is operated at a constant state so as to produce a predetermined constant air/fuel mixture. When the O.sub.2 sensor is warm, its output is processed to determine whether the air/fuel mixture is too rich or too lean as part of a CLOSED LOOP control method in which carburetor operation is adjusted in order to correct the air/fuel ratio in accordance with the output of the O.sub.2 sensor.

REFERENCES:
patent: 3949551 (1976-04-01), Eichler et al.
patent: 4321903 (1982-03-01), Kondo et al.
patent: 4359029 (1982-11-01), Furuhashi et al.
patent: 4365599 (1982-12-01), Ikeura
patent: 4373187 (1983-02-01), Ishii et al.
patent: 4380985 (1983-04-01), Otsuka et al.
patent: 4389996 (1983-06-01), Yaegashi et al.

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