Exhaust emission control system
AssigneeMitsubishi Jidosha Kogyo Kabushiki Kaisha
InventorsDaisuke Sanbayashi, Osamu Hirako, Yoshiaki Danno, Kazuo Koga
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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.
Claims18
An exhaust emission control system comprising:
- a) a first catalyst for purifying an exhaust gas at an initial stage of engine operation, the first catalyst being disposed in an exhaust path near an internal combustion engine;
- b) a second catalyst disposed downstream of the first catalyst, the second catalyst including a lean NOx catalyst for purifying nitrogen of oxides in a lean exhaust gas;
- a first bypass detouring the first catalyst and converging with the exhaust path upstream of the second catalyst;
- a first select valve for controlling an amount of exhaust gas to be introduced to the first bypass and the first catalyst;
- and
- control means for providing the first select valve with signals indicative of positions of the first select valve.
Dependencies are inferred from the claim text.