| 摘要 |
<p>PURPOSE:To let yet higher exhaust flow back to the suction side, raising the suction temperature up, as well as to improve a degree of half-misfire preventing performance, by opening an exhaust reflux valve interposingly installed in an exhaust reflux passage to be opened to an exhaust passage being high in exhaust temperature, in time of engine warming up. CONSTITUTION:Each of first and second exhaust takeout ports 14 and 15 of a Diesel engine E is interconnected to a suction passage 6 at the downstream of a suction throttle valve 18 through each of first and second EGR passages 16 and 17, and in the point midway in each of these EGR passages 16 and 17, there are provided with both first and second EGR valves 19 and 20. And, control valves 21 and 22 for leading in suction negative pressure are installed in each of these EGR valves 19 and 20 interposingly via each of suction negative pipes 23 and 24. Then, these control valves 21 and 22 are controlled by a control unit 28 on the basis of each output of a engine speed sensor 29, a position sensor 30, a water temperature sensor 31 and first and second exhaust temperature sensors 32 and 33. At this time, temperature of exhaust to be discharged out of first and fourth cylinders 1 and 4 is compared whereby yet higher temperature exhaust is made flow back to the suction side.</p> |
