| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a supercharger control device preventing lowering of boost pressure when opening an exhaust bypass valve of a multistage turbocharger. <P>SOLUTION: On a high pressure side of a large-sized turbocharger 2 provided on an engine 10 of a vehicle, a small-sized turbocharger 3 smaller than the large-sized turbocharger 2 is provided in series, and the exhaust bypass valve 5 is provided in an exhaust bypass passage 4 bypassing the small-sized turbocharger 3. When an exhaust gas flow rate of the engine 10 is increased, the supercharger control device 1 opens the exhaust bypass valve 5 so as to increase the exhaust gas flow rate passing through the exhaust bypass passage 4 and introduced into the large-sized turbocharger 2. The supercharger control device includes an opening degree variation limiting means 6 for limiting an opening degree variation per unit time of the exhaust bypass valve 5 to a predetermined limit value to secure a response time of the large-sized turbocharger 2 when opening the exhaust bypass valve 5. <P>COPYRIGHT: (C)2010,JPO&INPIT |
