Exhaust gas purifying apparatus for internal combustion engine

Details Exhaust gas purifying apparatus for internal combustion engine Exhaust gas purifying apparatus for internal combustion engine

1978-08-25

1980-09-16

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60290, F01N 310

Patent

active

042222370

ABSTRACT:
An exhaust gas purifying apparatus for internal combustion engine of the type having an intake conduit for supplying air-fuel mixture to the engine, an exhaust conduit for conducting exhaust gas discharged from the engine to a catalyst for purifying the exhaust gas, secondary air supply pump driven by the engine for supplying secondary air to the exhaust conduit and detector for detecting oxygen content of the exhaust gas. The negative pressure in the intake conduit is compared with the differential pressure produced across a restriction disposed in the secondary air supply conduit thereby to control the quantity of the secondary air supply so as to be proportional to the quantity of the intake in dependence on the result of the comparison. The output signal of the oxygen detector is utilized for modifying the above control.

REFERENCES:
patent: 3931710 (1976-01-01), Hartel
patent: 3962867 (1976-06-01), Ikeura
patent: 3992878 (1976-11-01), Moorman
patent: 4146986 (1979-04-01), Kohama

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