F - Mech Eng,Light,Heat,Weapons – 02 – M
Patent
F - Mech Eng,Light,Heat,Weapons
02
M
123/90
F02M 23/00 (2006.01) F02D 33/00 (2006.01) F02D 35/00 (2006.01) F02M 3/09 (2006.01) F02M 7/24 (2006.01) F02B 1/04 (2006.01)
Patent
CA 1044094
Abstract of the Disclosure With respect to the engine equipped with a carburetor and a catalytic converter which requires to feed the engine with a stoichiometric air/fuel mixture, the control system is for regulating the air/fuel ratio produced in the carburetor and comprises an auxiliary air admitting passage connected to the fuel discharge passage of the carburetor in addition to a usual air bleed passage for the fuel discharge passage, an electromagnetic valve for controlling the admission of air into the auxiliary passage, an oxygen sensor dis- posed in the exhaust system upstream of the catalytic converter, and a control circuit for producing con- tinual pulses at a frequency between 5 and 100 Hz. The widths of the indidual pulses are increased gradually while the output of the oxygen sensor indicates the air/fuel ratio being below the stoichiometric ratio, and vice versa. The valve is opened as each pulse is applied thereto so that the air feed rate to the fuel in the fuel passage is momentarily augmented by admission of air into the auxiliary passage. - 1 -
238806
Nakamura Koyo
Sanbuichi Hiroshi
LandOfFree
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