Air/fuel ratio control system for an internal combustion engine

Details Air/fuel ratio control system for an internal combustion engine Air/fuel ratio control system for an internal combustion engine

1984-04-18

1986-02-25

Cox, Ronald B.

Internal-combustion engines

Charge forming device

Multiple carburetors

123440, F02B 300

Patent

active

045721491

ABSTRACT:
An air/fuel ratio control system for an internal combustion engine equipped with a three-way catalytic converter, comprises first and second fluid supply passages for supplying, for example, a secondary air or a supplemental fuel to the engine, and a flow control valve disposed in the first fluid supply passage for varying the amount of the secondary air or the supplemental fuel in accordance with a detected condition of the air/fuel ratio. An open/close valve is disposed in the second fluid supply passage for opening and closing the communication through the second fluid supply passage without regard to the air/fuel ratio signal and with a predetermined period which is shorter than a normal period of turning over of the air/fuel signal, thereby reducing the deviation of the actual air/fuel ratio from a central value of the air/fuel ratio control, to improve the efficiency of purification of emission by means of the three-way catalytic converter.

REFERENCES:
patent: 4109623 (1978-08-01), Rivere
patent: 4287865 (1981-09-01), Seitz
patent: 4292946 (1981-10-01), Masaki
patent: 4335699 (1982-06-01), Totsune
patent: 4378773 (1983-04-01), Ohgami
patent: 4402293 (1983-09-01), Ohgami
patent: 4407243 (1983-10-01), Otsuka
patent: 4407247 (1983-10-01), Masaki
patent: 4495922 (1985-01-01), Fujimura

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