| 摘要 |
PURPOSE:To utilize thermal energy of exhaust gas instead of a heater by providing, in a branch point, a switching means can select either one of a path connected to an intake channel or a path connected to an exhaust channel. CONSTITUTION:A lead-through pipe 6 which is an exhaust gas lead-through passage is connected to an exhaust manifold. The lead-through pipe 6 is divided in two ahead of a cooling zone to which a cooling pipe 8 is inserted and connected, and one is connected to an intake channel, and also the other is connected to an exhaust pipe 5. A three way valve 9 which serves as a switching valve possible to select either one of a path A connected to exhaust pipe 6 or a path B connected to the intake channel, is attached in a branch point. Hereby, exhaust gas is efficiency utilized by switching the three way valve 9 in such a way that cooling water is heated by exhaust gas heat so as to discharge cooled exhaust gas in an exhaust channel when water temperature is low, and the exhaust gas cooled by the cooling water is led to flow into the intake channel when exhaust gas temperature is raised. |
