| 摘要 |
PURPOSE:To improve air intake efficiency and suppress production of polluting matters by providing compressors to be turned by No. 1 and No. 2 turbines in downstream and upstream of an oxygen enrichment device, respectively. CONSTITUTION:When a signal for detecting the flow of fuel for an engine 1 is received from a load sensor 12, turbochargers 2 and 3 are started to blow air and an air pressure regulating mechanism 61 are controlled, both of which are related to enrichment action of an oxygen enrichment device 4, according to the detecting signals from a pressure sensor 15 for detecting the sucked air pressure for the engine 1 and an oxygen sensor 16 for detecting the amount of oxygen in the sucked air. By this, the sucked air in an oxygen density according to the load on the engine can be obtained and the production of nitrogen oxide and soot is suppressed since the air intake pressure is controlled at proper low level. Also, a cooler 5 cools a supercharger by means of air supplied from the oxygen enrichment device 4 by a compressor 32. Thus, sucked air temperature for the engine 1 becomes low and air intake efficiency is raised. |
