| 摘要 |
PROBLEM TO BE SOLVED: To provide a reset timing generating device for generating the timing to reset the offset drift of a cylinder internal pressure sensor, and a cylinder internal pressure detecting device capable of accurately detecting the cylinder internal pressure of an internal combustion engine using the reset timing generating device. SOLUTION: The cylinder internal pressure detecting device 12 comprises a detecting circuit part 200 detecting the variation of resistance of a piezoresistance element 138 as an electric signal, an amplifying circuit part 201 amplifying and outputting the electric signal, and a correcting circuit part 202 correcting the output value. The correcting circuit part 202 comprises a peak hold circuit part 205 holding a peak value of output voltage of the amplifying circuit part 201; a voltage dividing circuit part 206 dividing the output voltage of the peak hold circuit part 205; a comparing circuit part 207 comparing the output voltage of the voltage dividing circuit part 206 with the output voltage of the amplifying circuit part 201; and an operation part 208 computing the timing to reset the output voltage of the amplifying circuit part 201 based on an output signal of the comparing circuit part 207. COPYRIGHT: (C)2009,JPO&INPIT
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