Exhaust gas-purifying system for internal combustion engines
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsTakashi Komatsuda, Hiroaki Kato, Yuichi Shimasaki, Akihisa Saito, Toshikazu Oketani, Takuya Aoki
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Abstract
An exhaust gas-purging system for an internal combustion engine includes a catalyst arranged in an exhaust passage of the engine, for purifying exhaust gases emitted from the engine. The system detects an engine operating condition and a catalyst temperature parameter indicative of the temperature of the catalyst. The supply of secondary air to the exhaust passage and the flow path cross-sectional area of the exhaust passage are controlled based on at least one of the operating condition of the engine and the catalyst temperature parameter.
Claims15
An exhaust gas-purifying system for an internal combustion engine having an exhaust passage, comprising:
- catalyst means arranged in said exhaust passage, for purifying exhaust gases emitted from said engine;
- secondary air supply means for supplying a secondary air into said exhaust passage at a location upstream of said catalyst means;
- flow path cross-sectional area-changing means arranged in said exhaust passage at a location downstream of said catalyst, for changing a flow path cross-sectional area of said exhaust passage;
- engine operating condition-detecting means for detecting operating conditions of said engine;
- catalyst temperature parameter-detecting means for detecting a catalyst temperature parameter indicative of a temperature of said catalyst means;
- and
- control means for controlling operation of said secondary air supply means and operation of said flow path cross-sectional area-changing means, based on at least one of said engine operating conditions detected by said engine operating condition-detecting means and said catalyst temperature parameter detected by said catalyst temperature parameter-detecting means.
Dependencies are inferred from the claim text.