| 摘要 |
<p>PURPOSE:To accurately judge a regeneration timing of a filter by providing pressure sensors to detect gas flow condition after regeneration of the filter and a control circuit to judge the regeneration timing of the filter. CONSTITUTION:Pressure introducing pipes 14 and 15 are respectively connected to the exhaust pipe 2 on the upper stream and that on the lower stream of a filter 1 as means to detect gas flow condition after regeneration of the filter 1. A first pressure sensor 16 and a second pressure sensor 17 are provided for detecting the exhaust pressure in this exhaust pipe territory. Analog signals from the first pressure sensor 16 and the second pressure sensor 17, besides an analog signal from an exhaust temperature sensor 22 provided on the upper stream side of the filter 1 and detecting exhaust temperature Th, and the like are input to the input side of a control circuit 6a. In the control circuit 6, pressure difference across the filter in the standard operating condition is computed, and the filter regeneration timing is judged by whether the pressure difference reaches a prescribed value or not. In this way, the regeneration timing of the filter 1 can be accurately judged.</p> |
