Exhaust gas purifier
AssigneesHitachi, Ltd., Hitachi Car Engineering Co., Ltd.
InventorsKozo Katogi, Masami Nagano, Hiroshi Sekine, Hiroyuki Takamura, Shinji Nakagawa
Life of this patent
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Abstract
In order to improve the decrease of the catalytic action and the deterioration of the exhaust purification performance, a catalyst installed in the exhaust pipe of an engine and a secondary air pump for supplying secondary air into the exhaust pipe are provided, and the secondary air pump is operated even after the engine has stopped.
Claims19
An exhaust gas purifier comprising a catalyst installed in the exhaust pipe of an engine and a secondary air pump for supplying secondary air into the exhaust pipe, wherein said secondary air pump is operated in accordance with the operating condition of the engine.
An exhaust gas purifier comprising a catalyst installed in the exhaust pipe of an engine and a secondary air pump for supplying secondary air into the exhaust pipe, wherein said secondary air pump is operated after the engine has stopped.
A controller of an exhaust gas purifier comprising a catalyst installed in the exhaust pipe of an engine and a secondary air pump for supplying secondary air into the exhaust pipe, wherein said secondary air pump is operated after the engine has stopped.
Dependencies are inferred from the claim text.