Operation Lever Symmetrical Sensor Magnetic Field Cancellation
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Solution Overview
Problem
The operation lever for working equipment, such as bulldozers, experiences erroneous detection issues that affect its accuracy in operation states, particularly when tilting, due to the magnetic field changes detected by sensors.
Innovation Solution
The operation lever incorporates a pair of rods disposed at point-symmetrical positions with respect to the operation axis, equipped with magnets, and a pair of magnetic sensors positioned at line-symmetrical locations relative to the magnetic field bisectors, which allows for equal detection intensity and cancellation of non-target magnetic field components, reducing erroneous detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single magnetic sensor is used to detect the magnetic field of magnets on rods, then the detection of magnetic field changes is simplified, but erroneous detection occurs due to unequal magnetic field intensity detection and inability to cancel non-target magnetic field components
Solution Approach 1:
The single magnetic sensor is segmented into a pair of magnetic sensors positioned at line-symmetrical locations. Each sensor detects magnetic field components from the magnets on the rods, and through symmetrical arrangement, the system can distinguish target signals from non-target interference, thereby improving detection accuracy without significantly increasing overall system complexity
Solution Approach 2:
The magnetic sensors are positioned at line-symmetrical locations with respect to the magnetic field bisector, creating a specific asymmetric detection geometry. This asymmetric positioning allows the sensors to detect equal magnetic field intensity from target magnets while naturally canceling non-target magnetic field components, resolving the erroneous detection issue
2Measurement precision
If additional magnetic shields are added to cancel non-target magnetic field components, then erroneous detection is reduced, but the device size and complexity increase
Solution Approach 1:
The mechanical approach of using magnetic shields is replaced with a sensor-based solution. By positioning magnetic sensors at line-symmetrical locations, the system uses geometric arrangement and signal processing to cancel non-target magnetic field components, eliminating the need for additional magnetic shielding materials and reducing device volume
Solution Approach 2:
The line-symmetrical positioning of magnetic sensors acts as an intermediary mechanism that naturally filters and cancels non-target magnetic field components. Instead of using physical barriers (magnetic shields), the symmetrical sensor arrangement serves as a geometric mediator that selectively detects target signals while rejecting interference, thereby improving accuracy without increasing device size
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 configuration effectively reduces erroneous detection by ensuring equal magnetic field intensity detection and cancellation, enhancing the accuracy of the operation lever's state detection without the need for additional magnetic shields, thus maintaining a compact design.
Implementation Method 1
Each of the rods is provided with a magnet that moves integrally with the rod. Each of the magnets moves integrally with the rod. In addition, the stroke detection device includes a magnetic sensor which detects a magnetic field of each of the magnets.
Data Source
AI summary
An operation lever includes: a pair of rods disposed at point-symmetrical positions with respect to an operation axis; magnets disposed on the respective rods; and a pair of magnetic sensors disposed at line-symmetrical positions with respect to a second straight line perpendicular to a first straight line connecting centers of one of the rods and the other rod, on a plane perpendicular to the operation axis.