Engine intake a/f ratio control system in outboard engine...

Details Engine intake a/f ratio control system in outboard engine... Engine intake a/f ratio control system in outboard engine...

F - Mech Eng,Light,Heat,Weapons

02

M

F02M 23/04 (2006.01) F01N 3/28 (2006.01) F02D 43/00 (2006.01) F02M 7/10 (2006.01) F02M 25/07 (2006.01)

Patent

CA 2505799

An intake A/F control device of an outboard engine, wherein a secondary air path (P) for feeding a mixture A/F regulating secondary air is connected to an intake system carburetor (33) of an engine (E) and a duty control unit (92) to control the duty ratio of pulses to be applied to a coil (76) is connected to a duty control valve (68) connected to the secondary air path (P), an LAF sensor (94) which detects the A/F of the exhaust gas and inputs a detection signal in proportion to the A/F to the duty control unit (92) is installed in an exhaust system, whereby even when the allowance of purification rate of a catalytic converter is set rather larger with an engine output taken somewhat in consideration or even when a set width is shifted to the rich side of the A/F with an emphasis placed on the engine output, the exhaust gas A/F can be controlled accurately to a desired target value.

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