Motorcycle Clutch Engagement Ratio Detection From Transmission Speeds
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing clutch engagement ratio detection systems in motorcycles lack accuracy, leading to inefficiencies in engine management and potential damage from slipping or improperly engaged clutches.
Innovation Solution
A system and method for determining the actual clutch engagement ratio by calculating the transmission speed ratio, comparing it to the gear ratio, and extrapolating the clutch engagement ratio using sensors and controllers, which includes a detection controller and main controller to set flags for clutch conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional digital clutch switches are used to detect clutch engagement, then the system is simple and cost-effective, but the measurement precision of clutch engagement ratio is insufficient (only indicating 10% or 90% engagement)
Solution Approach 1:
The patent replaces traditional mechanical/digital clutch switches with a computational approach that uses existing sensors (engine speed sensor, transmission output speed sensor) and mathematical calculations to determine clutch engagement ratio. The controller calculates the ratio by comparing actual transmission output speed with expected speed based on engine speed and gear ratio, eliminating the need for additional mechanical detection components while achieving continuous precise measurement.
Solution Approach 2:
The system utilizes existing sensors and controllers already present in the motorcycle for other functions (engine management, transmission control) to simultaneously perform clutch engagement detection. The same sensors that monitor engine and transmission speeds for normal operation are repurposed to calculate clutch engagement ratio, avoiding additional hardware while enabling precise measurement.
2Reliability
If accurate clutch engagement ratio detection is implemented, then engine management efficiency and safety are improved, but the device complexity and cost increase due to additional sensors and controllers
Solution Approach 1:
The patent makes existing sensors and controllers multi-functional by using them for both their original purposes and clutch engagement detection. The engine speed sensor and transmission output speed sensor, originally used for basic engine management and transmission control, are simultaneously utilized to calculate clutch engagement ratio, thereby improving reliability without adding dedicated detection hardware.
Solution Approach 2:
The controller acts as an intermediary that processes data from existing sensors and computes clutch engagement ratio through mathematical relationships rather than direct mechanical measurement. This intermediary computational approach enables reliable detection while avoiding the need for complex direct-sensing hardware.
3Loss of information
If continuous monitoring of clutch engagement is performed, then clutch wear and damage can be detected early, but the energy consumption and processing load increase
Solution Approach 1:
The system continuously monitors clutch engagement by performing calculations using data already being collected for normal operation. Since the engine speed and transmission output speed are continuously measured for operational control anyway, the additional calculation to determine clutch engagement ratio adds minimal processing load while providing continuous information about clutch condition and wear.
Data Source
AI summary
A method for determining a clutch engagement ratio for a vehicle having at least a front wheel and a rear wheel, a motor, a transmission, and a clutch coupling the motor to the transmission. The method may include receiving, at a controller, an output transmission speed. The method may include receiving, at the controller, an input transmission speed. The method may include calculating, with the controller, a transmission speed ratio by comparing the output transmission speed to the input transmission speed. The method may include receiving, at the controller, a currently engaged gear in the transmission. The method may include extracting, with the controller, a gear speed ratio associated with the currently engaged gear. The method may compare the transmission speed ratio to the gear speed ratio. The method may extrapolate a clutch engagement ratio. The method may determine a clutch condition.