| 摘要 |
<p>PROBLEM TO BE SOLVED: To restrain the deterioration of a fuel consumption rate with the excessive increase of exhaust pressure during partial load by providing a nozzle vane at the inlet of a turbine for a turbo charger to vary an exhaust air passing area so that the opening of the nozzle vane can be controlled to be increased corresponding to the increase of supercharging pressure. SOLUTION: In a turbo charger which has a compressor in an intake passage 2 and a turbine 4 in an exhaust passage 3, a nozzle vane 5 is provided at the inlet of the turbine 4 to vary the area of a nozzle. In a low load conditions where supercharging pressure is below P0 and differential pressure between exhaust pressure and supercharging pressure is below P1 , the nozzle vane 5 is fully closed. When the differential pressure between exhaust pressure and supercharging pressure gets to P1 , the second push rod 7d of the second actuator 7 is displaced corresponding to the differential pressure to open the nozzle vane 5 via a link 8 and a push rod 9 and, when supercharging pressure gets to P0 , the first actuator 6 is operated to control the opening of the nozzle vane 5 to be increased.</p> |
