Clutch Engagement Control Using Predictive Speed Filtering
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Solution Overview
Problem
Conventional clutch engagement control systems fail to achieve smooth engagement when instantaneous variations in rotational speed of the countershaft occur due to torsion downstream in the drive system, leading to uncomfortable torque changes and incomplete clutch engagement.
Innovation Solution
A clutch engagement control system that includes a second rotational speed detector and a control rotational speed calculation unit to set a control value for the countershaft rotational speed, preventing excessive changes and ensuring smooth engagement by considering a predetermined upper limit and gear position-specific values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clutch engagement control is executed based on rotational speed agreement between mainshaft and countershaft, then clutch engagement control can be achieved, but smooth engagement cannot be achieved when instantaneous variations occur due to torsion downstream
Solution Approach 1:
The system performs preliminary detection of rotational speed variations and predicts future rotational speed based on historical data before the actual clutch engagement decision is made. This allows the control system to anticipate and compensate for instantaneous variations caused by torsion, ensuring smooth engagement while maintaining reliable control.
Solution Approach 2:
A rotational speed variation detection unit and prediction mechanism acts as an intermediary between the raw rotational speed sensor data and the clutch engagement control decision. This intermediary layer filters out noise from downstream torsion and provides corrected rotational speed information for accurate engagement control.
2Device complexity
If rotational speed agreement is used as the basis for clutch engagement decision, then engagement control is simplified, but incorrect decisions occur when instantaneous variations from torsion are present
Solution Approach 1:
The system continuously monitors rotational speed variations and uses this feedback to adjust the engagement control timing. By comparing actual rotational speed with predicted rotational speed and detecting deviations, the system can determine when instantaneous variations occur and delay or adjust the engagement decision accordingly, maintaining both simplicity and precision.
Solution Approach 2:
The prediction unit calculates expected rotational speed values in advance based on historical data, allowing the control system to compare predicted versus actual speeds and make accurate engagement decisions even when downstream torsion causes temporary variations.
Data Source
AI summary
In a dutch engagement control system for engagement and disengagement of transmission of a rotational force between a mainshaft and a countershaft, when clutch engagement control is executed based on the determination that rotational speeds of both the shafts agree with each other, even if unexpected variations in countershaft rotational speed result from torsion occurring downstream of the countershaft in a drive system and/or the like, smooth engagement control is implemented. A control value of countershaft rotational speed at each time is updated and managed. If a threshold value is exceeded by a difference between a countershaft rotational speed actual measured value and the preceding control value, the threshold value is added to the preceding value to obtain the control value. If the threshold value does not exceed the difference, the actual measured value at this time is set as a control value without any change.