MOTORCAR HARMFUL EXHAUST GAS REDUCING POWER SYSTEM FOR CONSTRUCTION IN TUNNEL

摘要

PURPOSE:To make an atmospheric operation and a recycling operation switchable by providing a gate valve and a intake valve between a charging air heater and an oxygen mixer of a circulating path of a recycling engine and also providing a three way valve between an exhaust gas cooler and an oxygen mixer. CONSTITUTION:A recycle directional control three way valve 25 and a pressure regulating valve 26 are provided between an exhaust gas cooler 12 and an oxygen mixer 15 in a circulating path 17 from an exhaust gas outlet to a charging air heater 16 of an engine 1. One of outlet side ports of the recycle directional control three way valve 25 is released into the atmospheric air. Also, between the oxygen mixer 15 and the charging air heater 16 of the circulating path 17, a gate valve 29 and a intake valve 27 are provided. The intake valve 27 is a three way directional control valve, and an inlet side port is released into an atmospheric air and one of the outlet side ports is opened into the circulating path 17, with the other opened into a by-pass path 28.