| 摘要 |
PURPOSE:To improve the durability of an engine and reduce NOx concentration by setting the recirculation flow of exhaust gas to predetermined values respectively when the shift range of an automatic transmission is travelling range and neutral range. CONSTITUTION:In idling when the shift range of an automatic transmission is travelling one, exhaust gas is recirculated with a first predetermined value flow. In idling when the shift range of the automatic transmission is neutral one, the exhaust gas is recirculated with a second predetermined value flow smaller than the first one. Also, in load running other than idling, the exhaust gas is recirculated with flow corresponding to the rotational frequency of an engine and the pedalling amount of accelerator pedal. Thus, the durability of a Diesel engine can be improved, and NOx concentration in the exhaust gas can be reduced. |
