Apparatus for controlling supercharging pressure in internal combustion engine

摘要

The diesel engine (10) is provided with a variable displacement turbo-charger (30) for adjusting the supercharging air pressure in an intake passage (22). The turbo-charger (30) includes a turbine (32) having variable vanes (36). The variable vanes (36) open and close to change the flow rate of exhaust gas passing through the turbine (32). The variable vanes (36) are controlled based on the operational status of the engine (10), including the engine speed N, the fuel oil consumption Q, the engine water temperature Tw, the supercharging pressure Pb, the atmospheric pressure Pa and the atmospheric temperature Ta, and the position of an EGR valve (50). Thus, the variable vanes (36) are suitably controlled according to the operational status of the internal combustion engine to achieve fine control of the supercharging pressure.