| 摘要 |
PROBLEM TO BE SOLVED: To improve boost pressure controllability and drivability of a turbo charger driving a flow rate regulation valve for controlling a boost pressure and a waste gate valve by one actuator.SOLUTION: "A bypass start opening θα in starting of opening a waste gate valve on the way of change of an opening of a flow rate regulation valve" is determined to "a side of a regulation valve minimum opening θL0" with respect to "a saturation minimum opening θL0 to minimize the flow rate regulation valve in a saturation range θL to maximize a turbine correction flow rate in changing the flow rate regulation valve from a regulation valve minimum opening θ0 to a regulation valve maximum opening θn". That is, an actuator operation angle ηα1 in starting valve opening of the waste gate valve is determined to an operation angle smaller than an actuator operation angle ηL0 at the saturation minimum opening θL0. Thus a boost pressure dead zone does not exist in the change range of the actuator, and the boost pressure controllability and drivability can be improved.SELECTED DRAWING: Figure 4 |
