| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an ion current detector in which the detection properties of an ion current for monitoring a combustion state are not deteriorated even when a smolder leak is present in an ignition plug of an internal combustion engine. <P>SOLUTION: The ion current detector is configured with the ignition plug 102 of the internal combustion engine, an ignition coil 103 which supplies a high voltage to the ignition plug 102, a controller 101 which sends an ignition command, a bias capacitor 104 which supplies a bias voltage to the ignition coil 103, an ignition capacitor 105 which is connected to a primary side winding 103a of the ignition coil 103, a DC power supply 106 which charges the ignition capacitor 105 and the bias capacitor 104, a current detecting unit 107 which detects a current flowing through the ignition plug 102, an ion current detecting unit 108 which detects an ion current from the current detected by the current detecting unit 107, and a Zener diode 204 which restricts a charging voltage of the bias capacitor 104. <P>COPYRIGHT: (C)2013,JPO&INPIT |
