| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust emission control device of a diesel engine efficiently performing rich spike with less fuel. SOLUTION: Presence of a demand for rich spike is determined in deceleration of the diesel engine 10 (steps 100, 102). When rich spike is demanded, valve timing of an exhaust valve 56 is advanced to make exhaust valve closing timing early (step 104). Fuel is injected into a cylinder from an injector (step 106) and is burned in the cylinder. When fuel is short of a fuel quantity required for the rich spike, fuel is applied to an exhaust system (step 108). A large pumping loss is caused by the advancing of the exhaust valve closing timing to countervail positive torque caused by the combustion of fuel in the cylinder, thereby enabling generation of desired engine brake force. COPYRIGHT: (C)2008,JPO&INPIT
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