| 摘要 |
PROBLEM TO BE SOLVED: To improve thermal efficiency, output performance and exhaust gas cleaning performance by providing an exhaust gas recirculation device for circulating a part of exhaust gas to intake air and then recirculating it in an internal combustion engine operated based on a mirror cycle. SOLUTION: New intake air A and fuel gas G are supplied to a mixer 5 and mixed, and then compressed by the compressor 2a of a supercharger 2. After the mixed result is cooled by an intercooler 3, it is supplied to an engine 1. Exhaust gas discharged by the engine 1 based on a mirror cycle is expanded by an exhaust turbine 2b to drive the compressor 2a, then cleaned by a three- way catalyst 6 and then discharged from an exhaust pipe E. In this case, a part of exhaust gas in the exhaust pipe E is led to an EGR device 10, its flowing-in rate is set to 15 to 30% of an intake amount by an EGR valve 11 controlled by a controller 7, passed through an EGR cooler 12 and circulated to the upstream side of the compressor 2a. Thus, thermal efficiency and outputs are increased by using both of a delayed closing mirror cycle and EGR. |
