Vehicle Direction Detection Using Unsigned Rotation Sensor Sequences
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Solution Overview
Problem
Existing methods for determining the direction of movement of a motor vehicle using unsigned rotation sensors are complex, require prior recording of sensor-specific irregularities, and result in late detection of direction changes, especially at low speeds, due to the need for multiple marker passes and higher costs associated with signed sensors.
Innovation Solution
A method that processes signals from multiple wheels jointly, recognizing a change in direction by a reversal in the chronological order of characteristic patterns from rotation sensors, allowing for earlier and simpler detection of direction changes by comparing sequences of signals against predetermined patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If signed rotation sensors are used to determine the direction of movement, then the direction detection accuracy is improved, but the sensor cost increases
Solution Approach 1:
The patent creates a virtual copy of the signed sensor functionality by processing signals from multiple unsigned sensors in combination. Instead of using expensive signed sensors directly, the system replicates their directional detection capability through signal processing algorithms that analyze the temporal sequence of patterns from multiple unsigned sensors, thereby achieving the same measurement precision without the increased hardware cost.
2Measurement precision
If multiple marker passes are required to determine direction change, then the detection accuracy is improved, but the detection time increases
Solution Approach 1:
The patent performs preliminary analysis of the temporal sequence of patterns from multiple unsigned sensors to detect direction changes. By continuously monitoring and analyzing the chronological order of pattern appearances in real-time, the system can detect direction changes with a single marker pass rather than requiring multiple passes, thereby reducing detection time while maintaining accuracy through the combined information from multiple sensors.
3Measurement precision
If sensor-specific irregularities are recorded and used for detection, then the measurement precision is improved, but the system complexity increases
Solution Approach 1:
The patent develops a universal signal processing method that works with standard unsigned rotation sensors without requiring sensor-specific calibration or recording of individual irregularities. The method uses the temporal sequence information from multiple sensors universally to detect direction changes, making the system applicable to any vehicle with unsigned sensors while avoiding the complexity of sensor-specific data recording and processing.
4Productivity
If joint processing of multiple sensor signals is performed, then the detection speed is improved, but the computational complexity increases
Solution Approach 1:
The patent segments the direction detection task by analyzing the temporal sequence of patterns from multiple sensors in a structured manner. Instead of performing complex simultaneous processing of all sensor signals, the system processes each sensor's pattern sequence individually and then combines the results by comparing the chronological orders, thereby achieving fast detection speed while keeping computational complexity manageable through divided processing steps.
Data Source
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AI summary
The invention relates to a method for determining a change in the direction of travel of a vehicle, the vehicle comprising at least four wheels and at least four rotation sensors each associated, respectively, with one of said wheels, each rotation sensor comprising a detection element that outputs a signal (S1, S2, S3, S4) which, during a movement of the vehicle, repeatedly presents a characteristic pattern (P). According to the invention, the method comprises the following steps: • - acquiring the signals (S1, S2, S3, S4) output by the rotation sensors; • - determining, for several subsets each comprising three of said signals, a sequence of signals, sorted by the chronological order in which the characteristic patterns appear in the acquired signals; and • - detecting a change in the direction of travel of the vehicle as a function of said sequence of signals determined for the subset. The invention likewise relates to a vehicle configured to implement such a method.