Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1996-08-08
1998-12-08
Wolfe, Willis R.
Power plants
Internal combustion engine with treatment or handling of...
Methods
60276, 60284, 60292, 60324, F01N 320
Patent
active
058454861
ABSTRACT:
In order to activate an exhaust catalyst of an engine as quickly as possible from the engine restart, an exhaust damper for opening and closing an exhaust pipe is disposed downstream of a catalyst. A pneumatic actuator drives to open and close the exhaust damper. A negative pressure is introduced into a pressure chamber of the pneumatic actuator to close the exhaust damper after the engine is stopped. The closed exhaust damper keeps the warmth of the catalyst to ensure high exhaust gas purification performed when the engine is restarted. Alternatively, activation of the exhaust catalyst is enhanced by retarding the engine ignition timing and raising the engine idling speed.
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Matsumoto Toshiki
Yamashita Yukihiro
Nippondenso Co. Ltd.
Wolfe Willis R.
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