Non-Contact Smart Shifter Using Spiral Magnet Position Sensing
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Solution Overview
Problem
Existing shifters in vehicles face challenges related to durability, weight, and ease of use, particularly in controlling vehicle functions such as movement, turn signals, headlights, and windshield wipers.
Innovation Solution
A non-contact smart shifter design incorporating a spiral magnet and a magneto-resistive sensor within a housing, where the spiral magnet rotates without contacting the sensor, allowing for precise position detection and multiple vehicle function control through a printed circuit board assembly and a three-dimensional integrated circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a contact-based shifter mechanism is used, then the structure is simple and easy to manufacture, but the durability is reduced due to wear and friction
Solution Approach 1:
The patent replaces the traditional mechanical contact-based shifter mechanism with a non-contact magnetic sensing system. A magnet is attached to the shifter lever, and its position is detected by a magnetic sensor (such as a Hall effect sensor or magneto-resistive sensor) mounted on the housing. This eliminates physical contact between moving parts, thereby eliminating wear and friction while improving durability. The magnetic field interaction substitutes for mechanical contact, resolving the contradiction between reliability and structural simplicity.
2Weight of moving object
If traditional contact-based shifters are used, then the manufacturing process is straightforward, but the weight is increased due to mechanical contact components
Solution Approach 1:
The patent eliminates heavy mechanical contact components (such as contact switches, sliding contacts, or mechanical linkages) by using a magnetic field-based sensing system. The magnet attached to the shifter lever and the magnetic sensor on the housing create a lightweight non-contact detection mechanism. This substitution significantly reduces the weight of the shifter assembly while the manufacturing process remains straightforward, involving only the attachment of a small magnet and mounting of a compact magnetic sensor.
3Reliability
If a non-contact magnetic sensing system is used, then durability is improved and weight is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent employs a three-dimensional magnetic field sensing approach that is less sensitive to precise positioning in any single dimension. Magnetic sensors can detect the magnet's position along multiple axes (x, y, z coordinates) simultaneously, and the system can be calibrated to account for manufacturing tolerances. This dimensional approach allows for greater flexibility in manufacturing precision requirements compared to traditional contact-based systems that require precise mechanical alignment.
Solution Approach 2:
The patent utilizes the properties of magnetic fields, which extend over a relatively large spatial range compared to mechanical contact. By adjusting parameters such as the strength of the magnet, the type of magnetic sensor, and the detection threshold, the system can tolerate variations in positioning while maintaining accurate detection. This parametric flexibility reduces the stringency of manufacturing precision requirements.
4Reliability
If a non-contact magnetic sensing system is used, then durability is improved, but the cost of components increases
Solution Approach 1:
The patent replaces expensive and complex mechanical contact systems (with multiple moving parts, contact switches, and mechanical linkages) with a simple non-contact magnetic sensing system. The magnet is a low-cost component, and modern magnetic sensors (such as Hall effect sensors or magneto-resistive sensors) have become increasingly affordable. This substitution reduces overall system cost while dramatically improving durability by eliminating wear-prone mechanical contacts.
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 design enhances durability and reduces weight while ensuring high accuracy and reliability in function control, enabling self-calibration and easy reconfiguration of vehicle functions.
Implementation Method 1
a magneto-resistive sensor configured to detect a rotational position of the spiral magnet
Implementation Method 2
the three-dimensional integrated circuit is configured to determine an absolute position of the second magnet... the three-dimensional integrated circuit determines the absolute position of the second magnet based on a flux density
Data Source
AI summary
A smart shifter is provided. The smart shifter includes a spiral magnet, a magneto-resistive sensor, and an outer housing. The spiral magnet and the magneto-resistive sensor are spaced apart within the outer housing such that there is no contact between the spiral magnet and the magneto-resistive sensor. The spiral magnet is configured to rotate with the outer housing. The magneto-resistive sensor is configured to determine a rotational position of the spiral magnet. A first function of the smart shifter is determined by the rotational position of the spiral magnet.