Control system for internal combustion engine
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsYuji Yasui, Masaki Ueno, Shusuke Akazaki, Yoshihisa Iwaki, Masahiro Sato
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Abstract
A control system for an internal combustion engine having an exhaust system, an intake system, and an exhaust gas recirculation mechanism for recirculating exhaust gases from the exhaust system to the intake system is disclosed. The exhaust system is provided with an adsorbent for adsorbing hydrocarbon. When the adsorbent has adsorbed the hydrocarbon and the engine is operating in an idling condition, an intake air amount of the engine is increased and an ignition timing of said engine is retarded, and at the same time, the exhaust gas recirculation is performed to recirculate the hydrocarbon desorbed from the adsorbent to the intake system.
Claims51
A control system for an internal combustion engine having an exhaust system provided with an adsorbent for adsorbing hydrocarbon and a catalyst for exhaust gas purification, said control system comprising:
- adsorbent temperature raising means for increasing an intake air amount of said engine and retarding an ignition timing of said engine when said adsorbent has adsorbed the hydrocarbon and said engine is operating in an idling condition after activating said catalyst.
A control system for an internal combustion engine having an exhaust system, an intake system, and an exhaust gas recirculation mechanism for recirculating exhaust gases from said exhaust system to said intake system, said exhaust system being provided with an adsorbent for adsorbing hydrocarbon, said control system comprising:
- recirculation control means for performing recirculation of the exhaust gases through said exhaust gas recirculation mechanism to recirculate the hydrocarbon desorbed from said adsorbent to said intake system when said adsorbent has adsorbed the hydrocarbon and said engine is operating in an idling condition with retarded ignition timing.
A control system for an internal combustion engine having an exhaust system, an intake system, and an exhaust gas recirculation mechanism for recirculating exhaust gases from said exhaust system to said intake system, said exhaust system being provided with an adsorbent for adsorbing hydrocarbon, said control system comprising:
- recirculation control means for performing recirculation of the exhaust gases through said exhaust gas recirculation mechanism to recirculate the hydrocarbon desorbed from said adsorbent to said intake system when said adsorbent has adsorbed the hydrocarbon and said engine is operating in an idling condition;
- and
- rotational speed fluctuation amount detecting means for detecting a fluctuation amount of rotational speed of said engine, wherein said recirculation control means decreases the amount of the recirculated exhaust gases when the fluctuation amount detected by said rotational speed fluctuation amount detecting means is greater than a second predetermined fluctuation amount.
A control method for an internal combustion engine having an exhaust system provided with an adsorbent for adsorbing hydrocarbon and a catalyst for exhaust gas purification, said control method comprising the step of:
- increasing an intake air amount of said engine and retarding an ignition timing of said engine when said adsorbent has adsorbed the hydrocarbon and said engine is operating in an idling condition after activating said catalyst.
A control method for an internal combustion engine having an exhaust system, an intake system, and an exhaust gas recirculation mechanism for recirculating exhaust gases from said exhaust system to said intake system, said exhaust system being provided with an adsorbent for adsorbing hydrocarbon, said control method comprising the step of:
- performing recirculation of the exhaust gases through said exhaust gas recirculation mechanism to recirculate the hydrocarbon desorbed from said adsorbent to said intake system when said adsorbent has adsorbed the hydrocarbon and said engine is operating in an idling condition with a retarded ignition timing.
A control system for an internal combustion engine having an exhaust system provided with an adsorbent for adsorbing hydrocarbon and a catalyst for exhaust gas purification, said control system comprising:
- an adsorbent temperature raising module for increasing an intake air amount of said engine and retarding an ignition timing of said engine when said adsorbent has adsorbed the hydrocarbon and said engine is operating in an idling condition after activating said catalyst.
A control system for an internal combustion engine having an exhaust system, an intake system, and an exhaust gas recirculation mechanism for recirculating exhaust gases from said exhaust system to said intake system, said exhaust system being provided with an adsorbent for adsorbing hydrocarbon, said control system comprising:
- a recirculation control module for performing recirculation of the exhaust gases through said exhaust gas recirculation mechanism to recirculate the hydrocarbon desorbed from said adsorbent to said intake system when said adsorbent has adsorbed the hydrocarbon and said engine is operating in an idling condition with a retarded ignition timing.
Dependencies are inferred from the claim text.