| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a diesel engine not requiring electronic components for operating charging throttle valve for air supply. <P>SOLUTION: The throttle valve 15 is provided in a charging passage 6 in an upstream of an EGR passage 7. The throttle valve 15 is pneumatic operation type. Upstream charge pressure 17 in an upstream of the throttle valve 15 is introduced to a throttle valve actuator 16, and the throttle valve 15 is operated open and close by imbalance of the upstream charge pressure 17 and spring force 19 of a throttle valve return spring 18. When upstream charge pressure 17 gets to throttle valve close pressure or higher, the throttle valve 15 is closed to predetermined throttle opening by imbalance of the upstream charge pressure 17 and spring force 19 f the return spring 18 to inhibit increase of downstream charge pressure 20 in a downstream of the throttle valve 15. EGR gas 9 is re-circulated to the charging passage 6 via the EGR passage 7 from an exhaust passage 1 by pressure difference of charge and exhaust pressure 20/21 acting on the EGR passage 7. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
