Two-Wheeler Steering Angle Estimation With Single-Pulse Sensors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional two-wheeler systems face inaccuracies in motion variable detection, particularly at low speeds, due to the use of single-pulse sensors, which increases complexity, cost, and weight when trying to improve accuracy.
Innovation Solution
A method utilizing a sensor system comprising a rotation rate sensor, an acceleration sensor, and a single-pulse Reed sensor to detect three-dimensional rotation rates and acceleration values, estimating the motion state, correcting it, and actuating the drive unit or antilocking system based on the instantaneous steering angle, allowing for precise control without the need for complex and costly sensor systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-pulse sensor with a single magnet is used, then cost, simplicity, and weight are reduced, but measurement precision deteriorates particularly at low speeds
Solution Approach 1:
The patent combines a single-pulse wheel speed sensor with a rotation rate sensor (gyroscope) and acceleration sensor to create an integrated sensing system. The rotation rate sensor detects angular velocity of the wheel, and the acceleration sensor detects linear acceleration, which are then fused with the single-pulse sensor data to accurately determine steering angle and motion state, compensating for the low-speed inaccuracies of the single-pulse sensor while maintaining system simplicity
Solution Approach 2:
The patent introduces a control device as an intermediary that processes data from multiple sensors and estimates motion state using algorithms. This control device fuses information from the rotation rate sensor, acceleration sensor, and single-pulse wheel speed sensor to compute steering angle and correct motion state estimates, enabling accurate low-speed detection without requiring complex hardware
2Measurement precision
If multipulse sensors are used to increase accuracy, then measurement precision improves, but device complexity, cost, and weight increase
Solution Approach 1:
Instead of using multiple pulse sensors on the wheel, the patent merges a single-pulse wheel speed sensor with a rotation rate sensor and acceleration sensor. This combination allows the system to achieve accurate speed and steering angle detection through sensor fusion and motion state estimation, avoiding the complexity of multipulse wheel sensors while maintaining high measurement precision
Solution Approach 2:
The patent replaces the mechanical approach of using multiple magnets and pulses on the wheel with a sensor fusion approach using a rotation rate sensor (gyroscope) and acceleration sensor. This substitution uses inertial measurement and algorithmic processing instead of mechanical multipulse encoding, reducing sensor system complexity while achieving accurate motion detection
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
Enables precise and cost-effective detection of motion variables, particularly at low speeds, ensuring accurate actuation of the drive unit and antilocking system, enhancing safety and control during maneuvers like cornering and braking.
Implementation Method 1
a single-pulse Reed sensor that includes exactly one magnet that is fastened to the wheel and rotates with the wheel, and in particular a receiver that detects exactly one measuring pulse when it passes by the magnet
Data Source
AI summary
A method for operating a two-wheeler. The two-wheeler includes a drive unit and a sensor system, the sensor system including a rotation rate sensor, an acceleration sensor, and a wheel speed sensor. The wheel speed sensor detects at least one measuring pulse per revolution of a wheel of the two-wheeler. The method includes: detecting three-dimensional rotation rates of the two-wheeler, detecting acceleration values of the two-wheeler, and estimating a motion state of the two-wheeler based on the detected rotation rates, the motion state including estimated values for estimated acceleration values and an estimated speed and an estimated distance covered, first correction of the estimated motion state based on the detected acceleration values, ascertaining an instantaneous steering angle of the two-wheeler based on the corrected estimated motion state, and actuating the drive unit and/or an antilocking system of the two-wheeler as a function of the ascertained instantaneous steering angle.