Vehicle Door Sensor Extraction for Magnetic Noise
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing opening/closing systems for vehicles, particularly sliding doors, face issues with reduced detection accuracy due to magnetic field disturbances and magnetized abrasion powders, as well as decreased reliability and sensitivity caused by heat and noise interference, affecting the operation and control of the sliding door.
Innovation Solution
The system incorporates a magnet fixed to the outer periphery of a rotating disk member between the gear case and output member, with magnetic sensors opposing the magnet to detect rotation, and a partition wall forming a labyrinth seal to block noise and water, enhancing detection accuracy and reliability while reducing noise and water ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the magnetic sensor is disposed inside the gear case to detect rotation, then the detection structure is compact, but the detection accuracy is reduced due to magnetic field disturbances from the clutch coil and magnetized abrasion powders
Solution Approach 1:
The magnetic sensor is extracted from the gear case interior and mounted on the exterior surface of the gear case, separating it from the harmful magnetic field environment inside the gear case while maintaining its detection function through the gear case wall
Solution Approach 2:
The gear case wall acts as an intermediary medium that allows the magnetic sensor to detect the rotation of the output shaft through the wall structure, enabling detection without direct exposure to the harmful magnetic field environment inside the gear case
2Ease of operation
If the electromagnetic clutch is provided between the reduction gear mechanism and output shaft to enable manual operation, then the ease of operation is improved, but the reliability is reduced due to magnetized abrasion powders affecting the magnetic sensor
Solution Approach 1:
The magnetic sensor is extracted from the interior environment affected by abrasion powders and placed on the exterior of the gear case, eliminating the reliability issue caused by magnetized powder accumulation while preserving the electromagnetic clutch function for manual operation
3Measurement precision
If the magnetic sensor is exposed to the gear case interior environment, then the detection structure is simple, but the detection sensitivity is reduced due to heat and noise interference
Solution Approach 1:
The magnetic sensor is taken out from the hot interior environment of the gear case and mounted on the exterior surface, allowing it to operate in a cooler environment with less thermal interference while maintaining detection capability through the gear case structure
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 improves the detection accuracy of the output member's rotation, enhances the reliability of the opening/closing system, reduces noise in the vehicle cabin, and increases the waterproof effect, ensuring smooth and reliable operation of the sliding door.
Implementation Method 1
a magnet disposed between said gear case and said output member, and rotating along with said output member; and a magnetic sensor disposed so as to oppose said magnet and detecting a rotation of said output member from a change in a magnetic field created by said magnet
Implementation Method 2
a so-called friction type one comprising a drive disk fixed to a side of the reduction gear mechanism, a follower disk fixed to an output shaft, and a clutch coil, wherein the mutually faced disks are pressed by magnetic attraction caused by the clutch coil and the transmission of power is made
Data Source
AI summary
An opening/closing system for vehicle can improve detection accuracy of rotation of an output member and enhance reliability of its operation. The opening/closing system for vehicle includes a drive unit having an electric motor and a reduction gear unit. A drum, which is an output member, is fixed to the output shaft of the drive unit through a power transmittable member. A magnet fixed to the outer periphery of a disk member is disposed between the drum and the gear case of the reduction gear unit in such a way that the magnet rotates along with the drum when the disk member is fixed to the power transmittable member. A housing case fixed to the gear case is provided with a sensor accommodating section that accommodates a magnetic sensor. The magnetic sensor is disposed to detect the rotation of the drum from a change in a magnetic field created by the magnet.