Brake Pedal Stroke Sensing With Cross-Checked Magnetic Flux Detectors
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Solution Overview
Problem
Conventional brake pedal displacement detection systems are prone to measurement inaccuracies and failures due to sensor malfunctions, especially in adverse environments, leading to unreliable braking performance.
Innovation Solution
A displacement detection system for brake pedals that includes a magnet-supported shaft generating a magnetic field, a pedal wake up sensor using Hall switch sensors to detect changes in magnetic flux, and a pedal travel sensor with multiple detectors to measure stroke, with a control device verifying the reliability of measurements by comparing values from both sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single pedal stroke sensor is used to detect brake pedal displacement, then the device complexity is low, but the reliability of braking performance deteriorates when the sensor malfunctions
Solution Approach 1:
The sensor system is segmented into multiple independent detection units (first pedal stroke sensor with first detector, second pedal stroke sensor with second detector) that independently measure pedal displacement. This segmentation allows the system to maintain reliability by using multiple sensors while keeping each sensor unit relatively simple in structure
Solution Approach 2:
The system changes the parameter of sensor quantity from one to multiple, and introduces a verification mechanism that changes the operational parameter by comparing measurement values against predetermined thresholds. This allows the system to detect and respond to sensor malfunctions while maintaining overall system reliability
2Measurement precision
If multiple detectors are used to independently detect magnetic flux, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The detection system is divided into multiple independent detectors (first detector, second detector) that each independently measure magnetic flux changes. Each detector maintains a simple structure while the collective system achieves higher measurement precision through redundancy and cross-verification
Solution Approach 2:
The system uses multiple detectors that essentially copy the same detection function. Each detector is a duplicate of the same type (magnetic flux detector), and their measurements are compared to verify accuracy. This copying approach improves precision without requiring complex different detection methods
3Reliability
If sensor malfunction detection is implemented, then the reliability is improved, but the difficulty of detecting and measuring deteriorates due to the need for verification mechanisms
Solution Approach 1:
The control device implements a feedback mechanism where it continuously compares the measurement values from multiple detectors against each other and against predetermined reference values. When a detector's measurement falls outside the expected range, the system generates feedback to identify the defective sensor and switch to using only the reliable sensor's data
Solution Approach 2:
The system performs preliminary verification of sensor measurements by comparing them against predetermined reference values before using the data for braking control. This preliminary action of validation is built into the normal operation, making defect detection straightforward through routine comparison rather than requiring complex diagnostic procedures
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 system ensures reliable and accurate measurement of brake pedal displacement, reducing the likelihood of sensor failures and maintaining consistent braking performance by identifying and isolating defective detectors.
Implementation Method 1
a magnet supported on a shaft to generate a magnetic field
Implementation Method 2
detecting a change in magnetic flux according to a movement of the magnet
Implementation Method 3
a pedal wake up sensor detecting the change in magnetic flux to generate a wake up signal
Data Source
AI summary
Disclosed herein is a displacement detection system for a brake pedal. The system includes a displacement detection device including a pedal wake up sensor detecting the change in magnetic flux to generate a wake up signal for activating a control device, and a pedal travel sensor having a plurality of detectors that independently detect the magnetic flux, and detecting a change in magnetic flux to measure a stroke of the brake pedal, and is configured to verify reliability of a measurement value that is measured by each of the plurality of detectors of the pedal travel sensor using a measurement value of the pedal wake up sensor.