Ultrasonic Sensor Resonance Discrimination via Wave Width Threshold
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Solution Overview
Problem
Existing techniques face difficulties in correctly discriminating between unnecessary resonance of ultrasonic sensors and reflected sound from obstacles, such as resonance caused by adhering substances or temperature fluctuations, which affects the accuracy of object detection systems.
Innovation Solution
A control device with an acquisition circuit to measure the wave width of ultrasonic waves and a determination circuit that uses a threshold, specifically ⅖ of the reverberation end time, to differentiate between resonance and reflected sound from obstacles, allowing for accurate discrimination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultrasonic sensors are used for object detection, then detection capability is provided, but false discrimination between resonance and reflected sound occurs
Solution Approach 1:
The patent changes the parameter used for discrimination from traditional methods to wave width. By measuring the wave width of ultrasonic waves and comparing it against a threshold (specifically 1/5 of the reverberation end time), the system achieves accurate discrimination between resonance and reflected sound, resolving the false discrimination problem while maintaining detection capability
Solution Approach 2:
The patent replaces complex mechanical or algorithmic discrimination systems with a simpler threshold-based wave width measurement approach. This substitution simplifies the system while improving reliability by using a clear, objective criterion (wave width threshold) to distinguish between resonance and reflected sound, eliminating false alarms
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
The control device effectively distinguishes between unnecessary resonance and reflected sound, enhancing the accuracy of object detection and preventing false alarms, thereby improving the reliability of vehicle safety systems.
Implementation Method 1
an acquisition circuit 22 that acquires a wave width of an ultrasonic wave transmitted by an ultrasonic sensor 10
Implementation Method 2
a determination circuit 23 that determines that resonance has occurred when the wave width of the ultrasonic wave acquired by the acquisition circuit 22 is smaller than a threshold
Data Source
AI summary
A control device according to the present disclosure includes an acquisition circuit, and a determination circuit. The acquisition circuit acquires a wave width of an ultrasonic wave transmitted by an ultrasonic sensor. The determination circuit determines that a resonance has occurred when the wave width of the ultrasonic wave acquired by the acquisition circuit is smaller than a threshold.