| 摘要 |
PROBLEM TO BE SOLVED: To provide an output correction device which can correct the offset drift of a cylinder pressure sensor and a cylinder pressure detecting device which uses it and can detect the cylinder pressure of an internal combustion engine with high precision. SOLUTION: The cylinder pressure detecting device 12 includes a detection section 203 for detecting a change in the resistance of a piezoelectric element 138 as an electric signal and a correction circuit section 204 for correcting it and outputting it to the outside. The correction circuit section 204 includes a signal correction section 211 for correcting an electric signal output from the detection section 203, an output circuit section 212 for amplifying an electric signal output from the signal correction section 211 and outputting it to the outside, and a reset control section 213 for resetting the output value of the signal correction section 211 to be a standard value. The correction circuit section 204 is further provided with an internal reset function in which the reset control section 213 resets with reset timing calculated on the basis of the output signal of the detection section 203 and an external reset function in which the reset control section 213 resets on the basis of an external reset command signal. COPYRIGHT: (C)2010,JPO&INPIT |
