| 摘要 |
A diagnostic control device for a hybrid vehicle is provided for shortening the time required for a failure diagnosis of an evaporation purge system. After introducing the inlet-pipe's negative pressure into the evaporation purge system 51, the evaporation control unit 52 diagnoses failure states concerning the evaporation purge system 51 such as a leak by detecting changes in inner tank pressure over a prescribed time. In order to shorten such failure diagnosis control time, a motor generator 12 is driven to assist the engine when introducing the inlet-pipe's negative pressure into the evaporation purge system 51. With such assist-driving, it becomes possible to reduce engine load, therefore, the throttle valve 67 of the engine 11 can be controlled to be on the closed side, making it possible to create sufficient inlet-pipe's negative pressure. Through this, the pressure in the evaporation purge system 51 can be decreased quickly, which shortens the time for failure diagnosis in the evaporation purge system 51.
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