Actuator Control Device Hysteresis Compensation
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Solution Overview
Problem
Existing control devices for actuators, such as linear solenoids, face challenges in improving control performance due to hysteresis areas where driving current changes do not significantly affect the driving amount, leading to inefficiencies and power consumption issues.
Innovation Solution
A control device that includes a storage unit for hysteresis area information, a determining unit to set target current values based on the hysteresis area, and a driving unit to supply currents within specific limits (lower, upper, or intermediate values) of the hysteresis area, depending on the control mode selected, to stabilize or optimize the driving amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a driving current is changed to control the actuator, then the driving amount should change, but in the hysteresis area the driving amount does not change significantly
Solution Approach 1:
The control device performs preliminary action by determining the hysteresis area in advance through learning processes and storing this information. When controlling the actuator, the device uses this pre-acquired hysteresis information to predict and adjust the target current value, thereby compensating for the non-linear hysteresis behavior and improving both control precision and reliability
Solution Approach 2:
The control device implements feedback by continuously monitoring the relationship between driving current and driving amount, learning the hysteresis characteristics, and using this learned information to adjust future control commands. The feedback loop ensures that the target current value is dynamically adjusted based on the actual hysteresis behavior observed
2Speed
If the driving current is increased to overcome hysteresis, then control responsiveness improves, but power consumption increases
Solution Approach 1:
The control device changes the parameter of target current value dynamically based on the control mode and learned hysteresis characteristics. By adjusting the target current within the hysteresis area according to different operational requirements, the device achieves optimal balance between responsiveness and power consumption without always using maximum current
3Measurement precision
If correction for next target driving amount is performed considering hysteresis, then control accuracy improves, but device complexity increases
Solution Approach 1:
The control device performs self-service by automatically learning and storing its own hysteresis characteristics through the learning unit. The system uses its own operational data to build the hysteresis model, eliminating the need for external calibration or complex manual setup, thereby improving control accuracy without proportionally increasing system complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the control performance of actuators by stabilizing the driving amount, reducing power consumption, and improving responsiveness by strategically managing the driving current within the hysteresis area, thereby optimizing actuator operation.
Implementation Method 1
An actuator such as a linear solenoid has a hysteresis area in which a driving amount is not changed even when a driving current is changed
Implementation Method 2
The driving unit supplies a driving current according to the target current value determined by the determining unit to the actuator
Data Source
AI summary
A control device according to an embodiment includes a storage, a determining unit, and a driving unit. The storage stores therein information on a hysteresis area of an actuator. The determining unit determines, based on a control mode, a target current value according to the hysteresis area whose information is stored in the storage. The driving unit supplies a driving current according to the target current value determined by the determining unit to the actuator.