Air-fuel ratio control system

Details Air-fuel ratio control system Air-fuel ratio control system

F - Mech Eng,Light,Heat,Weapons

02

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341/38.19

F02D 28/00 (2006.01) F02D 41/14 (2006.01) F02D 41/26 (2006.01) F02M 3/09 (2006.01) F02M 7/24 (2006.01)

Patent

CA 1127742

ABSTRACT OF THE DISCLOSURE 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 control- ling the flow of fluid passing therethrough thereby provid- ing an optimum air-fuel ratio corresponding to the engine operating condition.

339144

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