| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust circulation control device for a Diesel engine capable of reducing the control program quantity and reducing smoke and a nitrogen oxide. SOLUTION: An exhaust gas recirculation(EGR) passage 53 is provided between the intake passage 47 and exhaust passage 48 of a Diesel engine 1, and an EGR valve 55 is provided in the middle. An electronic control device 71 sets the value subtracted with the transient lift reduction correction quantity from the ordinary basic lift quantity as the final EGR lift quantity. The engine speed and pressure ratio at that time are used as parameters in calculating the transient lift reduction correction quantity. The pressure ratio includes not only the supercharging pressure but also the load equivalent value serving as the parameter required to secure the optimum EGR quantity. The final EGR lift quantity becomes the optimum value for the operation state at that time, and the data quantity and calculation equations for control are prevented from becoming enormous. |
