| 摘要 |
<P>PROBLEM TO BE SOLVED: To calibrate an output value of an in-cylinder pressure detected by an in-cylinder pressure sensor, by using a correction value taking into account a change in actual pressure with time. <P>SOLUTION: An ECU 15 stores therein a table in advance. On the table, a predetermined correspondence is set which is realized between an amount of change in a crank rotational speed from an initial use state and an amount of change in an in-cylinder pressure of a cylinder 7. In a correction value calculation processing, the ECU 15 obtains the crank rotational speed as a detected rotational speed when a determination condition is satisfied, calculates an amount of change from a reference rotational speed of the detected rotational speed as the amount of change in the crank rotational speed from the initial use state, estimates the amount of change in the in-cylinder pressure of the cylinder 7 due to a long-term use of an engine 1 by using the amount of change in the crank rotational speed and the table, sets a correction value on the basis of the estimated amount of change in the in-cylinder pressure, and corrects an output value of the in-cylinder pressure detected by an in-cylinder pressure sensor 18 by using the correction value. <P>COPYRIGHT: (C)2012,JPO&INPIT |
