| 摘要 |
PURPOSE:To enable quick temperature rise of engine cooling water, by interrupting intake air or exhaust gas flow into a heatexchange chamber in a heatexchanger for heating the intake air of diesel engine by the heat of exhaust gas when the engine load is heavy. CONSTITUTION:An intake tube 2 from an air-cleaner 5 is coupled to an intake manifold 11 of a diesel engine 1, and a heatexchanger 4 is coupled between an exhaust manifold 12 and an exhaust tube 3. The heatexchanger 4 is concen tric double tube type heatexchanger where its inner tube 41 is coupled between the exhaust manifold 12 and the exhaust tube 3 and an outer tube thereof 42 is coupled to a bypass tube 21 branched from the intake tube 2. A changeover valve 6 for selectively opening/closing the bypath 21 and the intake tube 2 is provided at the downstream side opening of the bypass tube 21. Under heavy load of engine, said changeover valve 6 is closed by means of a computer 7 based on detection values from an intake temperature sensor 81, a water temper ature sensor 82, an accelerator opening sensor 84, a rotation sensor 83, etc. |
