| 摘要 |
<p>PURPOSE:To effectively perform purification of exhaust gas with the use of a catalyst while maintaining the intrinsic performance of a turbocharger, by regulating a passage valve by means of the temperature of an exhaust gas purifying catalyst and pressure of the air exhausted from a compressor chamber. CONSTITUTION:If the temperature of a catalyst 17 is below a given value, a hydraulic switching valve 23 interconnects an oil pressure introducing port 26 and a first oil port 24 or a pressure bleed port 27 and a second oil pressure port 25. An actuator 100 drives a rod 104 to rotate a passage valve 18 to the outlet passage 20 side so as to close this valve. When the temperature of the catalyst 17 exceeds the given value, the hydraulic switching valve 23 is changed over so that the passage valve 18 may be rotated to the bypass passage 21 side through driving of the rod 104, and the valve is closed. When the pressure of the air exhausted from a compressor chamber 4 exceeds a given value, a third pressure chamber 103 is increased in its pressure to displace the rod 104, and the passage valve 18 slightly releases the bypass passage 21 to reduce the number of revolution of a turbocharger 1 and control a supercharger.</p> |
