Steering Wheel Torque Measurement Using Magnetic Displacement
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Solution Overview
Problem
Current steering wheel torque measurement devices in electric power steering systems suffer from low precision and high cost due to their reliance on mechanical components like sliders and electric brushes.
Innovation Solution
A measuring device that incorporates a magnetic pole, magnetic sensor, first and second coils, oscillation exciting circuit, decoding circuit, power supply circuit, detection circuit, and control circuit, where the second coil is wound on a flexible or rotating shaft, and the first coil is fixed, with a magnetic sensor measuring the displacement of the magnetic pole to provide high precision and low cost torque measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mechanical components (slider, electric brush) are used for steering wheel torque measurement, then the device can be manufactured with existing technology, but the measurement precision is low and cost is high
Solution Approach 1:
The patent replaces the traditional mechanical measurement system (slider, electric brush) with a magnetic field-based measurement system. A magnetic pole is mounted on the rotating shaft, and a magnetic sensor detects its position to measure torque. This substitution eliminates mechanical contact, improving measurement precision while reducing device complexity and cost.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the rotating shaft and the detection system. The magnetic pole converts mechanical rotation into magnetic field variations, which the magnetic sensor then detects. This intermediary approach enables non-contact measurement, resolving the contradiction between precision and complexity.
2Measurement precision
If mechanical components are used for torque measurement, then the structure is simple, but the cost is high and precision is low
Solution Approach 1:
The patent replaces expensive mechanical components (slider, electric brush) with simpler magnetic components (magnetic pole, magnetic sensor). This substitution maintains manufacturing feasibility while significantly improving precision and reducing cost.
Solution Approach 2:
The patent changes the measurement parameter from mechanical position (slider) to magnetic field properties (magnetic sensor detection). This parameter change enables higher precision measurement while using cheaper, more reliable components, resolving the contradiction between precision and manufacturing cost.
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 solution achieves high precision and low cost steering wheel torque measurement, enhancing the control of power steering motor output torque while reducing environmental impact and energy consumption.
Implementation Method 1
a magnetic sensor for measuring the displacement of the pole
Implementation Method 2
The first coil surrounds an outside of the second coil, and has a certain space with the second coil. The first coil is fixed, and can not rotate with the flexible shaft or the rotating shaft. The first coil is coupled with the second coil.
Data Source
AI summary
A measuring device for steering wheel torque includes a magnetic sensor to measure a rotational torque of the steering wheel. The measuring device for steering wheel torque has the advantages of high measuring precision, non-contact, high reliability and low cost.