METHOD AND DEVICE FOR MONITORING AND OBSERVING CHANGE OF CATALYST AND DISCHARGE OF HARMFUL MATERIAL DEPENDING ON PASSAGE OF TIME IN EXHAUST GAS OF INTERNAL COMBUSTION ENGINE

摘要

PURPOSE: A device and a method are provided to monitor the change of exhaust gas catalyst depending on the passage of time as well as the passage of the entire time and read the entire amount of harmful material discharged at a start step or the amount having a characteristic to each start phase. CONSTITUTION: An error of a sensor(7) signal for operating the temperature of exhaust gas catalyst(5) and deciding the limiting value of change in gas concentration is obtained. The present light-off temperature and/or the selected temperature value and the light-off period during the arrival period of the light-off temperature are output by outputting the temperature on arriving at the limiting value. An operator performs the decision through the start storage value of the selected number and operates the temperature of the catalyst(5) while performing a start and a process.