Controlling apparatus for introduction air into an exhaust pipe

Details Controlling apparatus for introduction air into an exhaust pipe Controlling apparatus for introduction air into an exhaust pipe

1996-07-03

1998-03-10

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60284, 60289, F01N 322

Patent

active

057248109

ABSTRACT:
In an apparatus for controlling the introduction of air into an exhaust pipe of an internal combustion engine in which air is introduced from the intake side to the exhaust side to improve the efficiency of purifying exhaust gases, to prevent a decline in the purification efficiency of a catalyst in a state in which the exhaust gas temperature immediately after starting is low. A control valve 11 is provided in an air introducing pipe 9 for introducing air from the intake side to the exhaust side, and the control valve 11 is set in a shut-off state during starting or during starting and a predetermined time duration immediately after starting.

REFERENCES:
patent: 3503716 (1970-03-01), Berger
patent: 3751914 (1973-08-01), Pollock
patent: 3962867 (1976-06-01), Ikeura et al.
patent: 4098078 (1978-07-01), Laurent
Patent Abstract of Japan, "Control Device of Secondary Air for Purification of Exhaust Gas" (57-46010).
Translation of German Office Action dated Jul. 1, 1994.

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