| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To positively calibrate a zero point of a differential pressure sensor in an engine stop state. <P>SOLUTION: The exhaust emission control system is equipped with a filter 1 arranged in a discharge passage 22 of an engine 20 to collect particulates in exhaust, a differential pressure sensor 3 for detecting a differential pressure between an exhaust pressure on the upstream side of the filter and an exhaust pressure on the downstream side of the filter, and a zero point calibration means 30 for calibrating the zero point of the differential pressure sensor 3 in an engine stop state. In the zero point calibration means 30, the zero point calibration is executed after the engine stops and a predetermined delay time elapses. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
