EXHAUST GAS PURIFICATION SYSTEM OF DIESEL ENGINE

摘要

Every time start processing of a diesel engine (2) is performed and before the diesel engine (2) is started, differences of detection values (P1, P2) of first and second pressure sensors (21, 22) and a predetermined reference value Pref are calculated as first and second correction values ?P1 and ?P2 and stored, and a pressure difference P12 before and after a DPF (4) is calculated using the detection values of the first and second pressure sensors (21, 22) and the first and second correction values ?P1 and ?P2. Hereby, a pressure difference before and after a filter can be measured accurately by using a highly durable sensor of a simple structure for detection of a pressure difference before and after a filter.