Vehicle Seat Motor Jamming Detection Using Hall Sensor Pulse Width
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Solution Overview
Problem
Existing seat adjustment systems in vehicles face issues with jamming due to obstacles or passengers, requiring precise current sensors and additional elements, which are costly and complex.
Innovation Solution
A system using a Hall sensor to measure pulse width during motor operation, allowing quick detection of jamming by comparing learned pulse widths with normal conditions, and adjusting motor operation accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a current sensor is used to sense seat jamming, then jamming detection capability is improved, but device complexity and cost increase due to requiring high precision sensors and additional elements
Solution Approach 1:
The Hall sensor, originally designed for measuring motor rotation speed, is made multi-functional by also using it to detect seat jamming conditions. The controller analyzes the pulse width signal from the Hall sensor to determine both rotation speed and jamming occurrence, eliminating the need for separate detection devices.
Solution Approach 2:
The functions of rotation speed measurement and jamming detection are merged into a single detection system using the Hall sensor. The controller combines the analysis of pulse width characteristics to simultaneously achieve both measurement tasks, reducing device complexity.
2Reliability
If a current sensor is used to sense seat jamming, then jamming detection capability is improved, but manufacturing cost increases due to requiring high precision sensors and additional elements
Solution Approach 1:
The Hall sensor is designed to perform multiple functions: measuring motor rotation speed and detecting jamming conditions. This multi-functionality reduces the total component count and manufacturing cost while maintaining reliable jamming detection capability.
Solution Approach 2:
The existing Hall sensor system serves itself by providing additional jamming detection functionality without requiring external assistance from separate sensors or complex additional components. The controller leverages the existing pulse width measurement capability for dual purposes.
3Productivity
If pulse width measurement by Hall sensor is used for jamming detection, then detection speed is improved, but measurement precision requirements increase
Solution Approach 1:
The controller continuously monitors the pulse width signal from the Hall sensor and uses feedback comparison to detect jamming conditions. By establishing reference values and comparing real-time measurements, the system achieves both fast detection and adequate precision without requiring ultra-precise measurement capabilities.
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
Enables rapid and accurate detection of seat jamming without additional hardware, reducing complexity and cost by utilizing a Hall sensor to sense motor pulse width changes.
Implementation Method 1
a Hall sensor configured to sense an operation of the motor
Data Source
AI summary
Disclosed are a system and method for controlling a seat for a vehicle. In particular, the system includes a seat positioned in a vehicle, a motor embedded in the seat and configured to adjust an operation of the seat, a Hall sensor configured to sense an operation of the motor, and a controller configured to measure a pulse width according to the operation of the motor by means of the Hall sensor and determine whether jamming occurs during the operation of the seat based on the measured pulse width.