Closed-loop emission control apparatus for internal...

Details Closed-loop emission control apparatus for internal... Closed-loop emission control apparatus for internal...

F - Mech Eng,Light,Heat,Weapons

02

B

341/38.13

F02B 3/00 (2006.01) F02D 41/14 (2006.01)

Patent

CA 1108725

Abstract of the Disclosure A closed-loop emission control apparatus for internal combustion engines includes an exhaust com- position sensor disposed at the upstream side of a catalytic converter which converts the noxious exhaust components into harmless products at the highest ef- ficiency when the air-fuel ratio is controlled at a value in the vicinity of stoichiometry in accordance with a control signal derived from the sensed con- centration of the exhaust composition. The output from the exhaust composition sensor is utilized to generate an offset voltage by averaging the instantaneous values of the sensed concentration, the offset voltage being combined with the control signal to cancel an error introduced thereinto during use of the apparatus. - 1 -

271592

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