摘要 |
<P>PROBLEM TO BE SOLVED: To suitably suppress degradation in emission in startup of an internal combustion engine. Ž<P>SOLUTION: In an engine system 10 having an engine 200 including an exhaust throttle valve 221 disposed upstream of a three-way catalyst 220 in an exhaust pipe 218, an ECU 100 performs a startup control. In the startup control, the cranking of the engine 200 is performed to increase exhaust pressure in an exhaust pressure increase section upstream of the exhaust throttle valve in the exhaust pipe 218, in a predetermined startup permission state where a throttle valve 210 is fully-opened, the exhaust throttle valve 221 is in fully-closed; an overlap amount between an intake valve 215 and an exhaust valve 216 is zero, and fuel injection is stopped. Fuel injection is started up when it is determined that the exhaust pressure in the exhaust pressure increase section is sufficiently increased and that oxygen concentration is sufficiently increased, and after-burning of unburnt HC is promoted. By the after-burning of the unburnt HC, the temperature elevation of the three-way catalyst 220 is promoted. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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