| 摘要 |
<P>PROBLEM TO BE SOLVED: To more appropriately perform boosting in a boost converter and suppression of an excessive current from a secondary battery when starting boosting and supply. <P>SOLUTION: When boosting in the boost converter is started because a difference between a target voltage VH* of a high-voltage system and a voltage VL of a low-voltage system becomes larger than a prescribed voltage ΔVst, a voltage gradually raised from a starting battery voltage VLst being the voltage VL of the low-voltage system at the beginning of boosting is set as a second target voltage VH2* (S110) till a difference between the target voltage VH* of the high-voltage system and the second target voltage VH2* becomes equal to or larger than a release threshold Vref (S120), and a command duty ratio D is set in accordance with a feedforward item Dff calculated on the basis of the target voltage VH* of the high-voltage system and the voltage VL of the low-voltage system and a feedback item Dfb calculated on the basis of the second target voltage VH2* replaced for the target voltage VH* of the high-voltage system and an actual voltage VH of the high-voltage system (S130, S150). <P>COPYRIGHT: (C)2012,JPO&INPIT |
