Vehicle Ultrasonic Sensor Position Check Using Dual-Frequency Echoes
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Solution Overview
Problem
Ultrasonic sensors in vehicles often fail to engage properly with locking structures during installation, leading to incorrect positioning and alignment, which can result in misaligned detection zones and malfunctions in safety-relevant functions like pedestrian detection and autonomous maneuvering, with existing systems unable to detect and report such issues.
Innovation Solution
A method involving the use of ultrasonic sensors to emit pulses at different frequencies, receive echo signals, and determine the ratio of echo amplitudes to detect incorrect positioning by comparing these ratios against predetermined limits, utilizing the frequency dependence of detection ranges to verify correct alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If snap-in mounting is used for quick installation, then installation speed is improved, but positioning accuracy deteriorates
Solution Approach 1:
The system performs a self-check of sensor positioning immediately after installation by emitting ultrasonic signals and analyzing echo patterns. This preliminary verification detects misalignment caused by snap-in mounting before the vehicle operates, allowing correction or replacement of improperly installed sensors.
Solution Approach 2:
The evaluation unit provides feedback about sensor positioning accuracy by comparing actual ultrasonic echo patterns against expected patterns. This feedback mechanism enables automatic detection of installation errors and can trigger alerts for correction, closing the loop between installation and verification.
2Device complexity
If no positioning check is performed, then device complexity is reduced, but reliability deteriorates
Solution Approach 1:
The ultrasonic sensor performs its own positioning verification by emitting signals and analyzing its received echoes. The sensor essentially checks itself without requiring external specialized equipment, maintaining simplicity while ensuring reliability through self-diagnosis of installation correctness.
Solution Approach 2:
The ultrasonic sensor serves dual functions: its primary detection function and a secondary self-verification function. The same sensor hardware that detects obstacles also verifies its own installation positioning, eliminating the need for separate verification equipment and maintaining system simplicity.
3Measurement precision
If multiple ultrasonic frequencies are used for positioning verification, then measurement precision is improved, but energy consumption increases
Solution Approach 1:
The system varies the frequency parameter of ultrasonic signals to detect positioning errors. By comparing echo patterns at different frequencies, the system can identify misalignment with higher precision than single-frequency methods, as different frequencies provide complementary information about sensor orientation and positioning.
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
Effectively identifies and corrects incorrect sensor positioning, ensuring accurate detection zones and preventing malfunctions in vehicle safety systems by using a control unit to analyze echo amplitude ratios at varying frequencies.
Implementation Method 1
emitting at least one first ultrasonic pulse with the ultrasonic sensor at a first ultrasonic frequency, receiving at least one first echo signal with the ultrasonic sensor at the first ultrasonic frequency
Implementation Method 2
emitting at least one second ultrasonic pulse with the ultrasonic sensor at a second ultrasonic frequency, receiving at least one second echo signal with the ultrasonic sensor at the second ultrasonic frequency
Data Source
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AI summary
The invention relates to a method for checking the positioning of an ultrasonic sensor (10) on a vehicle (36), said ultrasonic sensor (10) being installed in a mounting (20) on the vehicle (36). The method has the steps of localizing a reference object in the detection region (40) of the ultrasonic sensor (10), emitting at least one first ultrasonic pulse with a first ultrasonic frequency by means of the ultrasonic sensor (10), receiving at least one first echo signal at the first ultrasonic frequency by means of the ultrasonic sensor (10), emitting at least one second ultrasonic pulse with a second ultrasonic frequency by means of the ultrasonic sensor (10), receiving at least one second echo signal at the second ultrasonic frequency by means of the ultrasonic sensor (10), ascertaining the ratio (44) of echo amplitudes of the reference object in the at least one first and second echo signal, and outputting an incorrect positioning of the ultrasonic sensor (10) if the ratio (44) of echo amplitudes in the reference object in the at least one first and second echo signal deviates from the ratio (44) for a correct positioning of the ultrasonic sensor (10) by at least one specified threshold. The invention additionally relates to a sensor assembly (30) comprising at least one ultrasonic sensor (10) and a control unit (32) which is connected to the at least one ultrasonic sensor (10) via a data connection (34), wherein the at least one ultrasonic sensor (10) is installed in a mounting (20) on the vehicle (10), and the sensor assembly (30) is designed to carry out the aforementioned method in order to check the positioning of an ultrasonic sensor (10) on a vehicle (10).