| 摘要 |
PROBLEM TO BE SOLVED: To improve accuracy in absolute pressure correction of a cylinder pressure detection device.SOLUTION: The cylinder pressure detection device includes a first circuit for amplifying a signal from a pressure detection part of a cylinder pressure sensor installed in an internal combustion engine with a first gain, a second circuit for amplifying the above signal with a second gain smaller than the first gain, first detection means for acquiring the output of the first circuit via a first A/D conversion circuit to detect a cylinder pressure, and second detection means for acquiring the output of the second circuit via a second A/D conversion circuit to detect a cylinder pressure. In the cylinder pressure detection device, when the output of the first circuit corresponding to a cylinder pressure in an adiabatic compression stroke section of the internal combustion engine falls within an input range of the first A/D conversion circuit, the absolute pressure correction amount of the cylinder pressure sensor is calculated according to the cylinder pressure detected by the first detection means. The calculated absolute pressure correction amount is used for the absolute pressure correction of the cylinder pressure detected by the first detection means or the second detection means. |
