Exhaust emission control system

Details Exhaust emission control system Exhaust emission control system

1993-02-19

1994-09-27

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having sensor or indicator of malfunction, unsafeness, or...

60288, 60301, 422171, F01N 328

Patent

active

053498160

ABSTRACT:
An exhaust emission control system for a motor vehicle is disposed in an exhaust path, comprises a first catalyst for purifying an exhaust gas during activation of an engine, a second catalyst disposed downstream of the first catalyst and including a lean NOx catalyst, a bypass detouring the first catalyst, a select valve for controlling the amount of exhaust gas to be introduced into the bypass and first catalyst, and a control unit for controlling the select valve and flow of the exhaust gas according to operating status of the engine.

REFERENCES:
patent: 3440817 (1969-04-01), Saufferer
patent: 4510749 (1985-04-01), Taguchi et al.
patent: 4817385 (1989-04-01), Kumagai
patent: 5060473 (1991-10-01), Nakagawa
patent: 5085050 (1992-02-01), Katoh
patent: 5233830 (1993-08-01), Takeshima
SAE Journal, "GM's Catalytic Converter", Homfeld et al., p. 33, left column, paragraph 5; FIG. 1 (1962).

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