| 摘要 |
A piezo-injector driving apparatus overcomes disadvantages occurring at the start and the end of charging or discharging of a piezoelectric element while maintaining high responsiveness. At the start and the end of charging a piezoelectric element, the absolute value of a change rate of electrical energy of the piezoelectric element is set lower than in a period between them. Therefore, the pattern of electrical energy of the piezoelectric element is in the shape of the letter S. This prevents an excess of energy supplied to the piezoelectric element at the start of charging and energy supplied to the piezoelectric element at the end of charging.
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