CVT Flange Position Calibration via Reference Correlation
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Solution Overview
Problem
Belt type continuously variable transmissions face challenges in accurately controlling the position of movable flanges due to variations in output characteristics of position sensors and dimensional tolerances, requiring complex adjustments after assembly and maintenance.
Innovation Solution
A control device with a flange position detection sensor, a restriction section, and storage sections to store reference correlations and detection values, allowing for precise control of the flange position and detection of abnormalities, enabling simpler adjustments and improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a position sensor is used to detect the position of the movable flange, then the gear ratio control can be automated, but the consistency of the correlation between the sensor detection value and the actual flange position deteriorates due to sensor variations and dimensional tolerances
Solution Approach 1:
The patent applies preliminary action by pre-storing reference correlation data between flange positions and sensor detection values in a storage section. This reference correlation is established beforehand through actual measurements at multiple flange positions, allowing the control device to compensate for sensor variations and dimensional tolerances during automated operation, thereby maintaining measurement precision while enabling automation.
2Manufacturing precision
If the control device is adjusted after assembly and maintenance to ensure correct flange control, then the control accuracy is improved, but the time and complexity of the adjustment process increases
Solution Approach 1:
The patent performs preliminary measurement and storage of reference correlation data during the manufacturing or initial setup phase. This pre-established correlation data is stored in the control device's storage section, eliminating the need for time-consuming adjustments after assembly or maintenance. The control accuracy is thus maintained while significantly reducing the time loss associated with post-assembly adjustments.
3Manufacturing precision
If the control device is adjusted after each belt replacement, then the control accuracy is maintained, but the productivity and ease of maintenance deteriorate
Solution Approach 1:
The patent establishes the reference correlation data between flange positions and sensor detection values during the initial manufacturing or setup phase, storing it in the control device's storage section. This preliminary action ensures that the control accuracy is maintained without requiring re-adjustment after belt replacement, thereby significantly improving maintenance efficiency and productivity while eliminating repeated adjustment operations.
4Measurement precision
If the correlation between sensor detection value and flange position is calibrated for each vehicle, then the measurement precision is improved, but the device complexity and ease of manufacture worsen
Solution Approach 1:
The patent creates a universal reference correlation data set that can be applied across multiple vehicles of the same model. By storing this standardized correlation data in the control device's storage section, the system achieves high measurement precision without requiring individual adjustment procedures for each vehicle. This universal approach simplifies the device complexity and ease of manufacture while maintaining accurate correlation between sensor detection values and flange positions.
Data Source
AI summary
A control device for a belt type continuously variable transmission of a vehicle such as a motorcycle includes a first storage section for storing in advance reference correlation between a position of a movable flange and a detection value of a flange position detection sensor. A first processing section moves the movable flange to a position where its movement is restricted by a restriction section. A detection value of the flange position detection sensor is stored in a second storage section. A second processing section derives correlation between the position of the movable flange and the detection value of the flange position detection sensor based on the detection value of the flange position detection sensor stored in the second storage section and the reference correlation between the position of the movable flange and the detection value of the flange position detection sensor stored in the first storage section. A detection value of the flange position detection sensor is thereby calibrated.