Dynamic Torque Control for Fluid Supply Valves
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Solution Overview
Problem
Existing torque control systems for variators fail to accurately match desired output during system acceleration due to transient factors, leading to discrepancies between expected and actual operation.
Innovation Solution
A method is introduced where a controller senses the actual pressure differential and acceleration, transforming corrective control signals to adjust actuator pressures dynamically, ensuring the variator's output torque closely matches the desired torque by using a dynamic transformation of torque control map values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a static torque control map is used to control the variator, then the control system is simple and easy to implement, but the actual system operation deviates from expected operation during acceleration due to transient factors
Solution Approach 1:
The patent transforms the static torque control map into a dynamic control system by introducing acceleration compensation. The controller now considers not only the current torque demand but also the rate of change of torque (acceleration) to adjust the actuator control signals. This dynamic approach compensates for transient effects during acceleration, making the actual system behavior match the expected behavior from the static map while accounting for real-time dynamic conditions.
Solution Approach 2:
The patent implements a feedback mechanism where the controller continuously monitors actual system acceleration and uses this information to adjust the control signals. By measuring the discrepancy between commanded and actual torque differentials and incorporating acceleration data, the system dynamically corrects control signals to maintain accurate torque control during transient acceleration events.
2Reliability
If acceleration compensation is added to the torque control system, then the accuracy of torque control during acceleration is improved, but the device complexity increases
Solution Approach 1:
The patent enhances the control system by adding acceleration as an additional parameter to the torque control calculation. The controller now processes not only torque demand but also acceleration rate, transforming the control law to include these dynamic parameters. This allows the system to compensate for transient effects while maintaining a relatively straightforward control architecture that builds upon the existing static torque control map framework.
Data Source
AI summary
A system and method for controlling a variator operate to detect variator torques and/or internal pressures and generates a preliminary corrective command. The preliminary corrective command is transformed via a dynamic transform to account for system characteristics during transient operating conditions such as machine acceleration, such that the acceleration of the system during transient periods is not torque-limited by static torque-control map values. In an embodiment, the acceleration may be positive or negative, and in a further embodiment, braking is automatically applied in the case of negative requested power or desired machine retarding.