| 摘要 |
PROBLEM TO BE SOLVED: To reduce an HC emission amount while securing combustion stability at the time of start or cold start (before completion of engine warm-up) of a cylinder injection type internal combustion engine. SOLUTION: At the time of start or cold start of the cylinder injection type internal combustion engine, an exhaust valve early closing control in which the close timing of an exhaust valve is controlled before an intake top dead center is conducted to compress a residual exhaust gas in a cylinder by rising of a piston from a close timing of the exhaust valve to the intake top dead center, and thereby increasing a temperature of the inside-cylinder gas with heat of the compression. At the time from the closing timing of the exhaust valve to the intake top dead center, a pre fuel injection is performed to combust the injected fuel of the pre fuel injection, and thereby further increasing the inside-cylinder temperature. According to the increasing effect of the inside-cylinder temperature by the early closing control of the exhaust valve and the pre fuel injection, vaporization of injected fuel of a main fuel injection after the pre fuel injection is effectively stimulated to secure the combustion stability and effectively reduce a wet amount, and thereby reducing the HC emission amount at the time of start or cold start. COPYRIGHT: (C)2009,JPO&INPIT
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