| 摘要 |
The present invention enables diagnosing defects of a hydrocarbon injection system before and after injecting fuel to exhaust pipes in real time. Thereby, the fire risk related to leakage of fuel of existing hydrocarbon injection systems can be significantly reduced; durability of a diesel particulate filter (DPF) can be improved; and an exhaust system of the vehicle can be operated more safely. Consequently, a quality of the vehicle as a commercial product can be enhanced. [Reference numerals] (AA) Start; (BB) Preparing DPF regeneration?; (CC) Second combination (Shut-off valve OPEN, Dosing valve CLOSE); (FF) Third combination (Shut-off valve CLOSE, Dosing valve CLOSE); (II) Fourth combination (Shut-off valve CLOSE, Dosing valve OPEN); (LL) Fifth combination (Shut-off valve OPEN, Dosing valve OPEN); (OO) Shut-off valve CLOSE, Dosing valve CLOSE; (PP) Complete diagnosis; (S10) First combination (Shut-off valve CLOSE, Dosing valve OPEN); (S20,DD,GG,JJ,MM) Fuel pressure measurement; (S30,EE,HH,KK,NN) Diagnosis |
