| 摘要 |
PROBLEM TO BE SOLVED: To improve an in-cylinder combustion state in an exhaust gas recirculation control device.SOLUTION: An exhaust gas recirculation control device controls a high-pressure EGR amount and a low-pressure EGR amount of an EGR system including a high-pressure EGR passage 20 and a low-pressure EGR passage 23. The exhaust gas recirculation control device includes: a calculation unit 2 that calculates a temperature difference ΔT obtained by subtracting a target value Tof an intake temperature of the engine 10 from a measurement value T; and a control unit 6 that controls the high-pressure EGR amount and the low-pressure EGR amount so as to make the temperature difference ΔT small on the basis of the temperature difference ΔT calculated by the calculation unit 2. The control unit 6 increases the high-pressure EGR amount when the temperature difference ΔT is a negative first threshold A or less, while increases the low-pressure EGR amount when the temperature difference ΔT is a positive second threshold B or more, having an absolute value smaller than the that of the first threshold A.SELECTED DRAWING: Figure 1 |
