Magneto-Resistance Angle Sensor for High Resolution Position Detection
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Solution Overview
Problem
The existing design of angle sensors in motor vehicle functional units often results in inadequate resolution due to suboptimal use of the measurement range, leading to inefficient control of adjustable elements like trunk lids.
Innovation Solution
The implementation of a magneto-resistance (MR) angle sensor with a stator equipped with evaluation electronics and a rotor featuring a permanent magnet arrangement, allowing for direct measurement of the rotor's position without contact, minimizing wear and interference susceptibility, and achieving high resolution through suitable bridge circuits and gearing arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional angle sensor design is used, then the device structure is simple, but the measurement range utilization is insufficient leading to inadequate resolution
Solution Approach 1:
The patent replaces conventional mechanical angle sensor components with a magneto-resistive sensing system. The magnetic field interaction between the permanent magnet on the rotor and the magneto-resistive elements on the stator provides contactless measurement, eliminating mechanical wear and enabling higher resolution through electrical resistance changes that respond to magnetic field variations.
Solution Approach 2:
The patent utilizes changes in electrical resistance parameters of magneto-resistive elements in response to magnetic field strength variations. By measuring the resistance changes of the magneto-resistive elements as the rotor moves, the system achieves high-resolution angle detection. The evaluation electronics process these resistance changes to determine precise rotor position.
2Reliability
If contact-based measurement is used, then the structure is simpler, but wear occurs reducing reliability
Solution Approach 1:
The patent replaces mechanical contact-based angle measurement with a magnetic field-based magneto-resistive sensing system. The rotor with permanent magnet and stator with magneto-resistive elements interact through magnetic fields without physical contact, eliminating wear and extending the functional life of the angle sensor while maintaining structural integrity.
3Measurement precision
If the measurement range is not optimally utilized, then the sensor design is simpler, but the control precision of the functional element deteriorates
Solution Approach 1:
The patent introduces a gearing arrangement as an intermediary mechanism between the functional element and the angle sensor. This gearing system optimizes the transmission of motion to the rotor, ensuring that the full measurement range of the angle sensor is effectively utilized. The gearing arrangement translates the functional element's movement into optimal rotor rotation, maximizing position detection resolution.
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
This solution ensures optimal detection of the functional element's position, providing high resolution over the entire measurement range and minimizing wear, while being durable and resistant to magnetic flux density fluctuations.
Implementation Method 1
The basic principle of a MR angle sensor is that the electrical conductivity of the electrical measurement conductor can be influenced by the application of a magnetic field to this measurement conductor. This effect is attributed to the Lorentz force.
Implementation Method 2
The basic principle of a MR angle sensor is that the electrical conductivity of the electrical measurement conductor can be influenced by the application of a magnetic field to this measurement conductor. This effect is attributed to the Lorentz force.
Data Source
AI summary
A functional unit of a motor vehicle tat has at least one adjustable functional element, a control means for controlling and/or for monitoring the position of the functional element, an angle sensor coupled to the functional element for determining the position thereof, a stator and a rotor that is pivotable relative to the stator around an axis of the angle sensor, the angle sensor producing an output signal which corresponds to a respective position of the rotor relative to the stator and the output signal being supplied to the control means, in which the angle sensor is a magneto-resistance angle sensor, the stator has evaluation electronics and the rotor has a permanent magnet arrangement. The functional element can be such motor vehicle elements as a pivotable rear hatch, a pivotable trunk lid, a pivotable hood and a pivotable or sliding door, a motorized seat adjustment, and a motorized window raiser.