DRIVE SYSTEM AND CONTROL METHOD OF THE SAME

摘要

On a first start of an engine after system activation, the start control technique gives a valve-closing instruction to close an exhaust flow changeover valve and thereby causes all the fuel exhaust introduced into an exhaust system to be discharged after transmission through an HC adsorbent (step S100). After confirmation of the closed position of the exhaust flow changeover valve (steps S110 and S120), the start control technique starts cranking the engine (step S130). Fuel injection control and ignition control are performed to start fuel injection from a fuel injection valve after elapse of a preset time period since the start of engine cranking (step S170). The fuel injection accordingly starts after substantial elimination of the fuel vapor accumulated in an air intake system due to oil-tight leakage of the fuel injection valve. This arrangement effectively prevents a variation in air-fuel ratio on or immediately after a start of the engine.