| 摘要 |
In a hybrid vehicle, at the time of starting up, by employing ignition startup, a direct-injection engine (12) in which one of the cylinders is at rest near the top dead center thereof: the engine rotation speed (NE) is raised by directly injecting a fuel into a first cylinder (K1), which is located before a second cylinder (K2) in the order of ignition and is in the expansion stroke and in which the exhaust valve is not open, and igniting the fuel to cause a first explosion in the first cylinder (K1); and in a maximum period (L) immediately after the engine rotation speed (NE) has started to increase, assistance to the increase of the engine rotation speed (NE) is started by transmitting an assist torque, which is output from a motor generator (MG), to the direct-injection engine (12) via a K0 clutch (34). In this way, the direct-injection engine (12) at rest can be started up by using a necessary and sufficient assist torque, i.e., electric energy, and thus, electric energy for engine startup to be stored in a battery (power storage device) (44) at all times is reduced. Thus, the EV drive range is expanded, and the fuel economy of the vehicle is suitably improved. |
