| 摘要 |
PROBLEM TO BE SOLVED: To provide an ignitor capable of accurately performing capacitance diagnosis of a power storing means arranged on an ignition circuit by self-diagnosis, and capable of securing movement of the ignition circuit. SOLUTION: In a diagnosis processing part 31b, a switching element 26 is shut and a capacitor 27 is connected only to a diagnosis circuit 31, and a switching element SW1 of an oscillation circuit 31a is turned on to feed electric power and the capacitor 27 is connected to an operational amplifier OP1. Next, in the diagnosis processing part 31b, a voltage Vin is applied to minus input of the operation amplifier OP1 through an input resistor R4, and thereby a diagnosis signal is oscillated by the oscillation circuit 31a, and a signal applied to the capacitor 27 is obtained, and a voltage amplitude value of the obtained signal is measured. Then, in the diagnosis processing part 31b, it is diagnosed whether the capacitance of the capacitor 27 is normal or abnormal by comparing the measured voltage amplitude value of the signal and a reference amplitude value calculated based on the capacitance of the capacitor 27 in specification and a resistance value of a positive feedback resistor R1. COPYRIGHT: (C)2005,JPO&NCIPI
|
