| 摘要 |
PURPOSE:To make improvements in exhaust capacity at the time of warming up, by comparing the reference load calculated in conformity with a detection value of cooling water temperature with the actual engine load and on the basis of this comparative result, compensating an EGR control command value in time of the warming up. CONSTITUTION:A device bearing the above caption is provided with an EGR control valve 7 interposingly installed in the point midway in an EGR passage to be interconnected to a suction passage and an exhaust passage at the more downstream side than a throttle valve 6. And, after calculating a desired EGR ratio at an operational device 21 on the basis of each output signal out of an engine load detecting device 18 and an engine speed detecting device 19, it controls each opening of these valves 6 and 7 according to an EGR control command value to be calculated from the desired EGR ratio at a controlling device 22. In this case, it is further provided with an operational device 23 calculating reference load to an engine speed on the basis of an output signal out of a cooling water temperature detecting device 20. And, this reference load is compared with the actual engine load, and in accordance with the comparative result, the EGR control command value is compensated (25) in time of warming up. |
