Multi-Gear Magnetic Steering Angle Sensing for Precise Detection
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Solution Overview
Problem
Existing steering angle sensing devices in electronic power steering systems lack the precision required for stable and precise vehicle control, particularly with the integration of advanced safety devices like vehicle dynamic control and traction control systems.
Innovation Solution
A steering angle sensing device comprising a main gear and multiple sub-gears with different tooth counts, coupled with magnetic sensors to detect changes in magnetic force, and a control device to calculate and cross-verify the steering angle, enhancing precision and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional steering angle sensing device with a single sensor is used, then the device complexity is low, but the measurement precision of steering angle is insufficient
Solution Approach 1:
The patent divides the steering angle sensing function into multiple independent sub-sensors (first, second, and third magnetic sensors) that each detect steering angle information through different sub-gears. This segmentation allows cross-verification of measurement results, thereby improving measurement precision while managing device complexity through functional distribution.
Solution Approach 2:
The control device receives steering angle information from multiple magnetic sensors and performs cross-verification to determine the final steering angle. This feedback mechanism where multiple measurements are compared and validated improves the reliability and precision of the steering angle detection.
2Measurement precision
If multiple magnetic sensors and sub-gears are added to improve precision, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The patent divides the steering angle sensing function into multiple independent sub-sensors (first, second, and third magnetic sensors) that each detect steering angle information through different sub-gears. This segmentation allows cross-verification of measurement results, thereby improving measurement precision while managing device complexity through functional distribution.
Solution Approach 2:
Multiple magnetic sensors are used to perform the same steering angle detection function through different mechanical pathways (different sub-gears). This multi-functionality approach improves precision through redundancy while the universal detection principle keeps the control logic relatively simple.
3Reliability
If a single sensor system is used, then the ease of manufacture is high, but the reliability for safety device operation is insufficient
Solution Approach 1:
The control device receives steering angle information from multiple magnetic sensors and performs cross-verification to determine the final steering angle. This feedback mechanism where multiple measurements are compared and validated improves the reliability and precision of the steering angle detection.
Solution Approach 2:
The patent incorporates redundant sensing pathways (multiple sub-gears and magnetic sensors) that can compensate for potential failures in individual components. This beforehand cushioning ensures that the system maintains reliability even if one sensor or gear fails, which is critical for safety device operation.
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
The proposed solution significantly improves the precision of steering angle detection, enabling more stable and precise vehicle control, and allows for self-diagnosis of potential errors in the sensing device.
Implementation Method 1
a first magnetic sensor detecting a change in magnetic force of the first sub-gear, a second magnetic sensor detecting a change in magnetic force of the second sub-gear, a third magnetic sensor detecting a change in magnetic force of the third sub-gear
Data Source
AI summary
Disclosed herein are a steering angle sensing device and a torque angle sensor module having the same. The steering angle sensing device includes a main gear rotating at the same angle as a steering shaft, a first sub-gear rotatably engaging with the main gear, a second sub-gear rotatably engaging with the main gear and having a number of teeth different from that of the first sub-gear, a third sub-gear rotatably engaging with the main gear and having a number of teeth different from that of each of the first sub-gear and the second sub-gear, a first magnetic sensor detecting a change in magnetic force of the first sub-gear, a second magnetic sensor detecting a change in magnetic force of the second sub-gear, a third magnetic sensor detecting a change in magnetic force of the third sub-gear, and a control device calculating a steering angle from the change in magnetic force detected by each of the first magnetic sensor, the second magnetic sensor, and the third magnetic sensor.