| 摘要 |
<p>PROBLEM TO BE SOLVED: To lower the generated pressure of a supercharger with excellent responsibility for heightening engine output control effect by, when the slip level of a wheel is more than a set value, supplying pressure equal to or higher than the maximum supercharging pressure occurred in the supercharger to a supercharging pressure adjusting system as control pressure from a pressure source for forcedly lowering the supercharging pressure. SOLUTION: In a turbocharger 18, a waist gate valve 19 is insertedly attached to a flow-in port, and controlled by an actuator 20 to bypass driving pressure for the turbocharger 18 for adjusting supercharging pressure. In order to adjust control pressure supplied to a pressure chamber partitioned with the diaphragm of the actuator 20, a duty solenoid valve 21 is provided, and controlled according to the duty ratio of a control signal outputted from an engine controller. The control pressure can be supplied from a positive pressure tank 44 for storing the supercharging pressure, and when the slip level of the wheel is more than a set value, the pressure from a pressure tank 40 is supplied to forcedly lower the supercharging pressure to an engine.</p> |
