| 摘要 |
<p>An exhaust system, may include a trapping filter (150), a nitrogen oxide purification catalyst (130) to eliminate nitrogen oxide of the exhaust gas, an injector (120) that selectively injects fuel in the exhaust line, a fuel cracking catalyst (140) that is disposed between the injector (120) and the trapping filter (150) at the exhaust line, transforms the injected fuel to a reducing agent, and a control portion that controls the injector (120) to inject a predetermined amount of the fuel for a predetermined time period so as to raise the temperature of the trapping filter (150) to a predetermined regeneration temperature and eliminate the particulate material trapped in the trapping filter (150), wherein the control portion detects a degradation rate of the fuel cracking catalyst (140), and varies the predetermined regeneration temperature of the trapping filter (150) depending on the degradation rate.</p> |
