Valve Device Actuator Control for Temperature-Dependent Impact Suppression
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Solution Overview
Problem
Conventional valve devices experience increased impact during valve closure at higher temperatures due to decreased grease viscosity, leading to potential actuator unit damage, while fixed control constants fail to balance response speed across varying temperature environments.
Innovation Solution
A valve device with an actuator and controller that adjusts the control constant for feedback control based on ambient temperature, reducing the response speed of the actuator unit at higher temperatures to mitigate impact without compromising speed at lower temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed control constant is used in feedback control, then the valve device can operate simply, but the impact at valve closure increases at higher temperatures due to decreased grease viscosity
Solution Approach 1:
The control constant is made dynamic by adjusting it according to the detected temperature. The control unit changes the control constant based on temperature readings, making the control system adaptive to temperature variations rather than using a fixed value, thereby resolving the contradiction between simplicity and impact suppression.
Solution Approach 2:
The control constant parameter is changed based on temperature conditions. When temperature increases and grease viscosity decreases, the control constant is adjusted to reduce the drive current, thereby suppressing the impact at valve closure while accounting for the changed physical conditions.
2Object-affected harmful factors
If the control constant is adjusted to suppress impact at high temperature, then impact is reduced, but the response speed of the actuator unit decreases at low temperature
Solution Approach 1:
The control constant dynamically adapts to temperature conditions. At low temperatures where grease viscosity is high, the control constant allows for higher drive current, maintaining fast response speed. At high temperatures where viscosity is low, the control constant reduces drive current to suppress impact, thus resolving the speed-impact trade-off.
Solution Approach 2:
The control constant parameter is varied based on temperature to optimize both response speed and impact suppression. The control unit detects temperature and selects appropriate control constant values, enabling the system to achieve fast response at low temperature and impact suppression at high temperature.
3Speed
If the control constant allows fast response at low temperature, then response speed is maintained, but impact at valve closure becomes excessive at high temperature
Solution Approach 1:
The control system transitions from a static fixed control constant to a dynamic temperature-dependent control constant. This allows the system to maintain optimal response speed at each temperature condition while preventing excessive impact at high temperatures through automatic adaptation.
Solution Approach 2:
The control unit uses temperature detection feedback to adjust the control constant appropriately. By continuously monitoring temperature and adjusting the control constant in response, the system automatically balances response speed and impact suppression based on real-time thermal conditions.
Data Source
AI summary
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.