Regenerative timewise detection device null of black smoke removal

摘要

PURPOSE:To determine regenerating time of a filter certainly and precisely by detecting that a diesel engine is idling-rotated, and providing a monitor means for detecting a regenerating time in output of a pressure sensor only for an idling period. CONSTITUTION:Since the ventilation area of a porous wall is reduced when a particulate is cumulated in a filter 1, pressure of exhaust gas in an exhaust passage 8 is raised, and the gas pressure is supplied from a pressure sensor 21 into a computer 14. In a computer 14, only when it is detected by an idling sensor 23 that a diesel engine 7 is in an idling condition, and when statically determinated time is passed from a time point shifted to the idling condition, output of the pressure sensor 21 is taken out firstly. Since pressure loss generated between the front and rear of the filter 1 in the idling condition is in monotonous function relation with a collected dust amount, it is judged that the collected dust amount is also in a limit amount showing the limit of screen function, when the pressure loss reaches a limit value.