CVT Control Device V-Belt Width Calculation Feed-Forward
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Solution Overview
Problem
Existing continuously-variable-transmission control devices face high processing loads and instability due to V-belt wear, which is not effectively detected, leading to inadequate control response and delayed belt replacement.
Innovation Solution
A control device that calculates the V-belt width and stores it for feed-forward control, allowing for correction of sheave positions and alerting the driver to replace the belt, thereby reducing processing load and improving stability and response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedback control is used to maintain accurate change gear ratio, then control accuracy is improved, but processing load on control device increases
Solution Approach 1:
The system performs preliminary action by calculating the belt width before it significantly degrades, storing this information for future feed-forward control. This prevents the need for complex real-time feedback processing while maintaining control accuracy through pre-computed correction values.
Solution Approach 2:
The belt width calculation serves as an intermediary parameter that mediates between the physical wear state and the control system. Instead of directly measuring change gear ratio deviations through complex feedback, the system uses belt width as an intermediate indicator to predict and correct potential issues.
2Stability of the object's composition
If feedback control is implemented for change gear ratio, then control stability is improved, but control response speed decreases
Solution Approach 1:
By calculating and storing belt width in advance, the system prepares correction data before control issues arise. This preliminary action enables faster response when corrections are needed, as the control device can immediately apply pre-calculated adjustments rather than computing them in real-time during feedback loops.
3Device complexity
If V-belt wear is not monitored, then device complexity is reduced, but reliability of transmission deteriorates
Solution Approach 1:
The control device performs self-service by using existing sensors and calculations to determine belt width without requiring additional dedicated monitoring hardware. The system leverages available data from the control device to automatically track belt condition, maintaining reliability while avoiding increased complexity.
Solution Approach 2:
The control device serves multiple functions: it controls the actuator, calculates change gear ratio, and now also monitors belt width. By making the control device multi-functional, the system avoids adding separate monitoring systems while enhancing transmission reliability through continuous belt condition tracking.
Data Source
AI summary
A continuously-variable-transmission control device having high control response and stability, reduced processing load on a control device and V-belt wear recognition. The width of the V-belt is calculated on the basis of a position of the primary sheave, a length of the V-belt, a distance between the sheaves, an angle of the sheave, and a change gear ratio during idling, and the calculated belt width is stored. The control device performs a feed-forward control on the starter in which it corrects the target position of the primary sheave on the basis of the belt width, and then controls the sheave position so as to reach the corrected target position. When the calculated belt width becomes equal to or smaller than a predetermined threshold, the control device issues an alarm that alerts the driver to replace the V-belt.