Increasing Method of Exhaust Gas Temperature at Idling Condition in DI Diesel Engines

The improvement of exhaust emissions in diesel engines will be achieved by combustion improvement and after-treatment. The exhaust catalyst is one of after-treatment and recently this system is adopted on passenger cars and trucks. But the exhaust gas temperature in diesel engines at idling condition is about 100℃, and doesn't reach the condition to active the catalyst. In this study, we attempted to increase the exhaust gas temperature by controlling of intake and exhaust systems and operating cylinder numbers. As a result, the exhaust gas temperature at idling condition could approach about 300℃ by applying the intake throttling and a half cylinder operation.