Clutch Actuator Friction Compensation for Responsive Control
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Solution Overview
Problem
Conventional clutch control devices do not effectively consider friction in the clutch driving mechanism, leading to suboptimal responsiveness in clutch control.
Innovation Solution
A clutch control device that includes a clutch actuator with a drive source and a power transmission mechanism, where a control unit detects friction parameters based on delays in the power transmission mechanism and adjusts the drive source's control parameters to account for friction, enabling more responsive clutch control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If friction in the clutch driving mechanism is not considered during control, then the control system is simpler, but the responsiveness of clutch control deteriorates
Solution Approach 1:
The control unit performs preliminary friction detection by applying a detection current to the electric motor and measuring the actual current consumption. This friction information is obtained in advance and stored for subsequent clutch control operations, enabling responsive control without adding complex real-time friction measurement systems.
Solution Approach 2:
The control unit uses feedback from the detected friction parameters (actual current values during detection) to adjust the control current supplied to the electric motor. By incorporating this feedback loop, the system achieves responsive clutch control while maintaining relatively simple system architecture.
2Productivity
If friction parameters are detected and used in control, then clutch control responsiveness improves, but the control process becomes more complex
Solution Approach 1:
Friction detection is performed in advance during clutch control operations, allowing the control unit to have friction compensation data ready before actual clutch engagement or disengagement. This preliminary detection approach improves control efficiency without requiring complex real-time friction calculation during critical clutch operations.
Solution Approach 2:
The control unit uses the electric motor's own current consumption characteristics to detect friction in the driving mechanism. By utilizing the existing motor and its electrical properties for self-diagnosis, the system achieves friction awareness without adding separate sensing devices or complex measurement systems.
3Measurement precision
If detection current is supplied to detect friction, then friction parameters can be obtained, but energy consumption increases
Solution Approach 1:
The control unit supplies detection current to the electric motor only partially - specifically during friction detection phases rather than continuously. This partial action approach provides sufficient friction measurement accuracy while minimizing unnecessary energy consumption during normal clutch operation.
Solution Approach 2:
Friction detection using detection current is performed periodically or at specific intervals rather than continuously. The control unit can detect friction at clutch engagement/disengagement moments or at predetermined intervals, achieving adequate measurement precision while significantly reducing energy consumption compared to continuous detection.
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 configuration allows for high responsiveness in clutch control by accounting for friction, improving the connection and disconnection processes, especially during vehicle travel.
Implementation Method 1
the control unit detects parameter values corresponding to friction of the clutch actuator on the basis of a delay in driving of the power transmission mechanism with respect to a change in a control parameter for the drive source
Data Source
AI summary
This clutch control device includes a clutch device configured to connect or disconnect power transmission between a prime mover and an output target, a clutch actuator configured to output a drive force for actuating the clutch device, and a control unit configured to control driving of the clutch actuator, in which the clutch actuator is provided with a drive source that outputs the drive force and a power transmission mechanism that is disposed between the drive source and the clutch device, and the control unit detects parameter values corresponding to friction of the clutch actuator on the basis of a delay in driving of the power transmission mechanism with respect to a change in a control parameter for the drive source, and controls driving of the drive source through use of a control parameter including at least a part of the parameter values corresponding to the friction.