Variable Speed Control System for Motorcycle Transmission
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Solution Overview
Problem
In variable speed control systems for motorcycles, high-speed operation can lead to insufficient change pedal load, causing shallow meshing issues where dog teeth fail to engage properly, potentially resulting in speed change failures and damage to the dog clutch due to excessive load concentration.
Innovation Solution
A variable speed control system that includes a multiple-speed transmission, a pedal load detection device, and an engine revolution speed detection device, where the control unit adjusts the pedal load threshold based on engine speed to ensure stable speed changes by increasing the threshold at higher engine speeds to prevent shallow meshing and reduce the risk of damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed pedal load threshold is used for speed change control, then the system is simple to operate at low speeds, but shallow meshing occurs at high speeds due to insufficient pedal load
Solution Approach 1:
The patent applies dynamics by making the pedal load threshold variable rather than fixed. The control unit dynamically adjusts the threshold based on detected vehicle speed, using a lower threshold at low speeds for ease of operation and a higher threshold at high speeds to ensure complete meshing and prevent shallow engagement of the dog clutch.
Solution Approach 2:
The patent changes the parameter of pedal load threshold according to vehicle speed. The control unit modifies this critical parameter based on speed detection, increasing the threshold at high speeds to generate sufficient pedal load for complete meshing, while maintaining a lower threshold at low speeds for operational ease.
2Reliability
If a high pedal load threshold is used to prevent shallow meshing, then meshing reliability improves, but operability deteriorates due to excessive pedal load requirement
Solution Approach 1:
The system dynamically adjusts the pedal load threshold based on real-time vehicle speed detection. At low speeds, a lower threshold maintains ease of operation, while at high speeds, the threshold increases to ensure complete meshing reliability, thus adapting the operational characteristics to match running conditions.
Solution Approach 2:
The control unit changes the pedal load threshold parameter according to vehicle speed. This parameter adjustment ensures that the threshold is appropriately matched to the running conditions, preventing both shallow meshing at high speeds and excessive pedal load requirements at low speeds.
3Reliability
If the dog clutch structure is strengthened to prevent shallow meshing, then meshing reliability improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent replaces mechanical strengthening of the dog clutch structure with an electronic control system. Instead of increasing the physical robustness of the dog clutch components, the system uses a control unit that detects vehicle speed and adjusts the pedal load threshold, thereby preventing shallow meshing through intelligent control rather than mechanical reinforcement.
Solution Approach 2:
The patent changes the operational parameters (pedal load threshold) rather than modifying the physical structure of the dog clutch. This approach prevents shallow meshing by optimizing the control parameters based on vehicle speed, avoiding the need for more complex or heavier dog clutch components.
Data Source
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AI summary
It is provided a variable speed control system which can realize a stable speed change action irrespective of running conditions. A variable speed control system (10) includes a multiple-speed transmission (12) which changes a speed of an engine output in multiple stages based on a change in meshing state of a dog clutch (90) which is caused in association with an operation of a change pedal (106) connected mechanically, a pedal load detection device (108) which detects an operation load of the change pedal (106), and a control unit (130) which suppresses or shuts off an engine output to the multiple-speed transmission (12) and permits a speed change action of the multiple-speed transmission (12) by means of the change pedal (106) when a detected pedal load (Ld) exceeds a pedal load threshold (Lt). The variable speed control system (10) further includes an engine revolution speed detection sensor (136) which detects an engine revolution speed (Ne). The control unit (130) changes the pedal load threshold (Lt) according to the engine revolution speed (Ne) detected.