| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a PM sensor capable of accurately detecting the amount of a PM. <P>SOLUTION: The PM sensor includes a radiator 2 installed in an atmosphere through which exhaust gases generated by combustion flow, an oscillation circuit 3 which is oscillated at the same frequency as an initial natural frequency of the radiator 2, a standing wave ratio detection circuit 4 for detecting a standing wave ratio when the radiator 2 is fed with a signal from the oscillation circuit 3, and an estimation circuit 5 for estimating the amount of the PM adhering to the radiator 2 on the basis of the standing wave ratio. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
