Valve device
In a valve device ( 1 ), when a valve ( 33 ) is closed, an output shaft of an actuator unit ( 10 ) is connected to the valve ( 33 ). A control unit of the valve device ( 1 ) determines a control constant to be a value by which a response speed of the actuator unit ( 10 ) is smaller as ambient temperature is higher, and performs feedback control.
1. A valve device comprising:
an actuator that includes components fixed to each other;
a valve to open and close a fluid passage by driving force of the actuator;
a connector that connects an output shaft of the actuator and the valve; and
a controller to control the actuator by feedback control,
wherein the controller determines a control constant used in the feedback control to be a value by which current supplied to generate the driving force is smaller as ambient temperature is higher, and
a width of a temperature section having a same control constant is narrower as temperature is higher, the temperature section being set in advance in a memory.
2. The valve device according to claim 1 ,
wherein the controller performs control including differential control as the feedback control and determines a differential constant used in the control to be a larger value as the ambient temperature is higher.
3. The valve device according to claim 1 ,
being a butterfly valve to open and close the fluid passage by rotating the valve.
4. The valve device according to claim 1 ,
being an exhaust gas recirculating valve.
5. The valve device according to claim 1 ,
wherein the controller is built in the actuator.