Motorcycle Ground Speed Detection Using Bank Angle Radius
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Solution Overview
Problem
Existing ground speed detection systems for motorcycles are inaccurate during cornering due to the change in tire contact points, leading to reduced accuracy in measuring ground speed.
Innovation Solution
A ground speed detection device that includes a wheel speed sensor, a bank amount sensor to detect the vehicle's bank angle, and a storage section to calculate ground speed based on the radial dimension corresponding to the bank angle, allowing for accurate speed measurement during cornering by selecting the appropriate wheel for calculation based on predetermined conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the ground speed is calculated using a fixed wheel radius, then the device complexity is reduced, but the measurement precision deteriorates during cornering
Solution Approach 1:
The patent applies the dynamics principle by making the wheel radius dynamic instead of fixed. The system detects the bank angle during cornering and selects different radial dimensions from storage based on the bank angle magnitude. This allows the calculation to adapt to changing vehicle states, improving measurement precision without significantly increasing device complexity.
Solution Approach 2:
The patent changes the parameter of wheel radius based on the bank angle. Multiple radial dimensions are pre-stored in the storage section, and the ground speed calculator selects the appropriate radius corresponding to the detected bank angle. This parameter change approach resolves the contradiction by maintaining simple device structure while achieving accurate ground speed detection under varying cornering conditions.
2Ease of operation
If the ground speed is calculated using a fixed radial dimension, then the ease of operation is improved, but the reliability deteriorates when wheels slip or are raised
Solution Approach 1:
The system dynamically selects the calculation basis based on vehicle state. The ground speed calculator determines whether to use front or rear wheel data based on detected conditions such as wheel slip or wheel lift. This dynamic adaptation maintains ease of operation through automated selection while significantly improving reliability in abnormal conditions.
Solution Approach 2:
The patent implements feedback by continuously monitoring wheel speed sensor data and bank angle, then using this information to select the appropriate wheel for ground speed calculation. When slip or lift is detected, the system feedback-adjusts the calculation source, maintaining reliability without complicating the operational process.
3Measurement precision
If the radial dimension is selected based on bank angle, then the measurement precision is improved during cornering, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-storing multiple radial dimensions in the storage section before operation. The ground speed calculator only needs to detect the bank angle and select the corresponding pre-stored radius, rather than performing complex real-time calculations. This approach improves measurement precision while minimizing the increase in device complexity.
Solution Approach 2:
The system creates copies of the wheel radius parameter for different bank angle conditions. Instead of calculating the radius dynamically, pre-calculated radial dimensions are stored and copied/selected based on the detected bank angle. This copying approach achieves high measurement precision with minimal additional system complexity.
Data Source
AI summary
A ground speed detection device for a vehicle includes a wheel speed sensor configured to detect a rotational speed of a wheel, a second storage section having stored a radius of the wheel corresponding to a bank angle, and a ground speed calculator configured to calculate a ground speed during cornering. The ground speed calculator extracts the radius of the wheel corresponding to a bank angle detected by a bank angle detection device, from the second storage section, and calculates the ground speed during cornering from the extracted radius of the wheel and the rotational speed of the wheel detected by the wheel speed sensor.