Shift Drum Angle Detection Using Speed Increasing Mechanism
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Solution Overview
Problem
Conventional shift drum angle detection systems in dual-clutch transmissions face challenges in accurately detecting small intervals of gear positions due to limited rotational angles, leading to reduced detection accuracy and precision in speed changes.
Innovation Solution
A shift drum angle detecting device that includes a first sensor shaft and a second sensor shaft with a speed increasing mechanism, where the second sensor shaft is rotated at a predetermined speed increasing ratio, allowing the second angle sensor to detect a larger rotational angle and improve accuracy in detecting the shift drum's rotational angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single angle sensor is used to detect the shift drum rotational angle with small gear position intervals (30 degrees), then the device complexity is reduced, but the measurement precision deteriorates due to insufficient resolution for small angle changes
Solution Approach 1:
The detection task is segmented into two parts: the first angle sensor detects the overall rotational position of the shift drum, while the second angle sensor detects the precise angular displacement within each gear position interval. This segmentation allows each sensor to operate within an optimized range, with the second sensor providing high-precision measurement of small 30-degree intervals through the speed-increasing mechanism that amplifies the rotation angle.
Solution Approach 2:
The speed-increasing mechanism acts as an intermediary between the shift drum and the second angle sensor. It mechanically amplifies the small rotational angles of the shift drum before they reach the second angle sensor, enabling the sensor to detect small gear position intervals with high precision. This intermediary mechanism transforms the detection problem from directly measuring small angles to measuring amplified angles.
2Adaptability or versatility
If the gear position intervals are reduced to increase the number of speed stages, then the transmission capability is improved, but the difficulty of detecting and measuring deteriorates due to smaller rotational angle changes between positions
Solution Approach 1:
The solution adds another dimension to the detection system by introducing a speed-increasing mechanism that transforms the angular displacement magnitude. Instead of relying on a single sensor to detect both position and small angle changes, the system uses dimensional transformation through mechanical amplification, converting small angular changes into larger, more easily detectable rotations at the second sensor.
3Ease of manufacture
If a potentiometer-based angle sensor is used, then the manufacturing cost is reduced, but the measurement precision deteriorates due to limited resolution for small rotational intervals
Solution Approach 1:
The speed-increasing mechanism performs preliminary action by amplifying the rotational angle before it reaches the angle sensor. This pre-amplification ensures that even low-cost potentiometer-based sensors can achieve sufficient measurement precision for small gear position intervals, as they are measuring amplified angles rather than the original small 30-degree changes.
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 solution enhances the detection accuracy of the shift drum's rotational angle, even at small intervals, by utilizing the output values from both sensors, thereby improving the precision of gear position detection and facilitating smooth speed changes in transmissions.
Implementation Method 1
The speed increasing mechanism increases an amount of rotation of the first sensor shaft at a predetermined speed increasing ratio. The speed increasing mechanism includes a speed increasing drive member, a speed increasing driven member, and a second sensor shaft. The speed increasing driven member is driven by the speed increasing drive member and has a diameter smaller than the speed increasing drive member.
Data Source
AI summary
A shift drum angle detecting device for a transmission includes shift forks, a shift drum, a first sensor shaft, a first angle sensor, a speed increasing mechanism, and a second angle sensor. The first angle sensor is to detect a rotational angle of the first sensor shaft to output a first output value based on the rotational angle. The speed increasing mechanism includes a speed increasing drive member, a speed increasing driven member, and a second sensor shaft. The second angle sensor is provided to the second sensor shaft to detect a rotational angle of the second sensor shaft and to output a second output value based on the rotational angle. A rotational angle of the shift drum is to be detected based on the first output value output from the first angle sensor and the second output value output from the second angle sensor.