| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an element impedance detector capable of restraining detection precision of an element impedance from getting low caused by erroneous detection of a holding value of a voltage variation. <P>SOLUTION: In this element impedance detector 1, the first low-pass filter 71 is provided to restrain a noise component caused by an ignition noise or the like from being superposed on an element resistance value signal Rpvs input into a signal holding circuit 55, and to restrain a detection error caused by the noise from being generated in the holding value of the element resistance value signal Rpvs held by the signal holding circuit 55. In the element impedance detector 1, the detection precision of the element impedance is thereby restrained from getting low, since the first low-pass filter 71 is provided to restrain the holding value of the voltage variation ▵Vs (the element resistance value signal Rpvs) from being erroneously detected. <P>COPYRIGHT: (C)2007,JPO&INPIT |
