| 摘要 |
An electronic control unit (ECU) stops driving a first switching transistor in a step-up circuit until an actual ground fault is determined after a possible ground fault is detected in a line that is electrically connected with an electric motor. As a result, a voltage stepped-up by the step-up circuit is controlled. Since current flowing through the electric motor does not sharply decrease immediately after the possible ground fault is detected in the line, unusual power steering movement is less likely to be produced. Moreover, switching transistors in an H bridge circuit, which is a motor drive circuit, are protected from damage because no excess voltage is applied to the switching transistors.
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