Air-fuel ratio control system

Internal-combustion engines – Charge forming device – Having fluidic logic control means

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F02M 718

Patent

active

043889042

ABSTRACT:
An air-fuel ratio control system is disclosed for use with a carburettor including an air-fuel induction passage provided therein with a throttle valve. The system comprises a control circuit responsive to various engine operating factors for deriving an engine operating condition and providing a pulse signal having a constant period and a pulse width corresponding to the derived engine operating condition, fuel supply means for supplying fuel, a fuel passage connected at its one end to the fuel supply means and at the other end to the induction passage downstream of the throttle valve, and a control valve provided in the fuel passage, the control valve responsive to the pulse signal from the control circuit for controlling the flow of fluid passing therethrough thereby providing an optimum air-fuel ratio corresponding to the engine operating condition.

REFERENCES:
patent: 3825239 (1974-07-01), Rice
patent: 3861366 (1975-01-01), Masaki et al.
patent: 4056932 (1977-11-01), Nakamura et al.
patent: 4092380 (1978-05-01), Pierlot et al.

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