Apparatus and method for introducing secondary air for cleaning

Details Apparatus and method for introducing secondary air for cleaning Apparatus and method for introducing secondary air for cleaning

1994-02-24

1995-05-09

Lazarus, Ira S.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60285, 60300, F01N 320

Patent

active

054129435

ABSTRACT:
A secondary air introduction apparatus introduces secondary air into an exhaust system of an internal combustion engine so as to clean exhaust gases emitted from the engine through the aid of a catalyst which is disposed in the exhaust system. The apparatus has a heating device which heats the secondary air which is to be introduced into the exhaust system, thereby elevating the temperature of the exhaust gases when the noxious components in the exhaust gases react with the oxygen in the secondary air, thereby improving the cleaning efficiency. In one form of the apparatus, the heating device is fixed to a part of the exhaust system such as a catalyst case connected in the exhaust pipe. The apparatus may have a controller which, upon detecting occurrence of any abnormality through detection of the temperature of the secondary air heated by the heating device, operates to activate a warning device or stop the operation of the whole apparatus. Also disclosed is a method of introducing secondary air by using the secondary air introduction apparatus.

REFERENCES:
patent: 3918257 (1975-11-01), Hirose
patent: 3979185 (1976-09-01), Stevenson
patent: 5136842 (1992-08-01), Achleitner
patent: 5224335 (1993-07-01), Yoshizaki
patent: 5337555 (1994-08-01), Tokuda
U.S. Appln. SN 07/978,414 filed Nov. 18, 1992, GAU 3403.
U.S. Appln. SN 08/078,465 filed Jun. 18, 1993, Gau 3402.

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