Grain collection volume detection device null of exhaust air grain collection vessel of

摘要

PURPOSE:To detect the accumulated quantity of collected particles by detecting the self combustion operating zone of collected particles without detecting the temperature of exhaust gas, and detecting the oxygen concentration of exhaust gas without using an oxygen sensor and the like. CONSTITUTION:The quantity of newly collected particles is computed by a means 70 based on the operating condition of an internal combustion engine, which is determined by the revolution and loading of the internal combustion engine detected by each means 50 and 60 respectively. In addition, the self combustion operating zone of collected particles in a collector is detected by a means 80 based on the operating condition of the internal combustion engine. Furthermore, the oxygen concentration of exhaust gas is detected by a means 90 based on the operating condition of the internal combustion engine in the self combustion operating zone. On the other hand, the amount of self combustion of collected particles is computed by a means 110 based on the flow rate of exhaust gas and the quantity of collected particles which are detected by the oxygen concentration and a means 100, following which, the accumulated quantity of collected particles is operated by a means 120 by adding the quantity of collected particles and subtracting the amount of self combustion concurrently.