| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve voltage stabilizing effect of a power supply line of the system in which a voltage of a DC power supply is boosted with a step-up converter to generate a system voltage on the power supply line, and the system voltage drives an AC motor through an inverter. <P>SOLUTION: A motor control device 37 performs a system voltage stabilizing control by controlling the input power of an MG unit 30 (AC motor 14) to suppress fluctuation of a system voltage. Further, it performs conversion power control in which the output power of a step-up converter 21 is controlled so that the output power of the step-up converter 21 agrees with a command value. It is determined whether the control region of the step-up converter 21 is a non-linear region or not based on the conduction duty ratio (conversion power control signal)of the step-up converter 21. If the control region of the step-up converter 21 is determined to be a non-linear region, the conversion power control is stopped to control a system voltage by system voltage stabilizing control. <P>COPYRIGHT: (C)2008,JPO&INPIT |
