| 摘要 |
PROBLEM TO BE SOLVED: To aim at achieving both control accuracy and stability according to state of engine operation at feedback control, for supercharging pressure control system of engine which performs feedback control of supercharging pressure by controlling supercharger with variable efficiency. SOLUTION: This control system is provided with control unit 100 which sets target value of supercharging pressure in intake air passage 7 as well as that of negative pressure in negative pressure passage 36, by detecting operation state of engine 1 with engine rotation sensor 86 and accelerator opening sensor 87. Unit 100 performs feedback control which has excellent accuracy based on actual supercharging pressure, for prevention of excessive rotation and emission measure of supercharger 20, when the state of operation of engine 1 is at high load, or in a state where reflux of exhaust gas takes place through reflux passage 50, and, otherwise, during normal operation, it performs negative pressure feedback control which has excellent control response based on actual pressure and control stability. |
