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AssigneeMitsubishi Jidosha Kogyo Kabushiki Kaisha
InventorsKatsunori Kaneko, Kazunari Kuwabara, Hiromitsu Ando, Toshio Shudo
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An exhaust-gas temperature raising system for a spark-ignition, in-cylinder injection type internal combustion engine includes an electronic control unit. In case that the engine is in an operating condition where the exhaust-gas temperature is required to rise, on an occasion of a main-fuel injection in a compression stroke, the electronic control unit controls engine control parameters such as ignition timing and air-fuel ratio to cause a cool-flame-reaction product, which remains in a combustion chamber in a middle stage or a subsequent stage of an expansion stroke, to have a concentration close to an inflammable concentration limit, and then causes an additional fuel to be injected into the combustion chamber from the fuel injection valve in the middle stage or the subsequent stage of the expansion stroke. The cool-flame reaction of the additional fuel quickly occurs, and the concentration of the cool-flame-reaction product exceeds the inflammable concentration limit, so that the additional fuel is enflamed by self-inflammation. The energy produced by the combustion of the additional fuel is effectively utilized for raising in the exhaust-gas temperature.
An exhaust-gas temperature raising system for an in-cylinder injection type internal combustion engine adapted to inject a main fuel directly into a combustion chamber from a fuel injection valve and to spark-ignite the injected main fuel for lean combustion, comprising:
An exhaust-gas temperature raising method for an in-cylinder injection type internal combustion engine adapted to inject a main fuel directly into a combustion chamber from a fuel injection valve and to spark-ignite the injected main fuel for lean combustion, comprising:
Dependencies are inferred from the claim text.