EXHAUST GAS PURIFYING DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

In an exhaust purification system of an internal combustion engine comprising an exhaust purification device which receives a bad influence from SO x in the exhaust gas and a S trap device arranged upstream of the exhaust purification device, which can store SO x in the exhaust gas, an amount of SO x passing through the S trap device is integrated as an integrated value, each allowance value of the integrated value for each elapsed period from the start time of the use of the S trap device is set, and when the current integrated value exceeds the corresponding allowance value and between a first set period ago and the current time, fuel has been supplied into the fuel tank and engine oil has not been exchanged, it is determined that fuel with a high concentration of sulfur has been supplied into the fuel tank.