Ultrasonic Object Detection Sound Pressure Adjustment
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Solution Overview
Problem
Conventional object detection devices using ultrasonic waves face reduced accuracy due to interference from other vehicles, and variations in sound pressure across different chirp signals lead to inconsistent detection performance.
Innovation Solution
An object detection device that adjusts the sound pressure of ultrasonic search waves and their reflected waves to maintain them within a predetermined range, using a transmission unit to send both up-chirp and down-chirp signals with varying frequencies, and a sound pressure adjustment unit to ensure consistent sound pressure levels for improved detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultrasonic waves are transmitted for object detection, then detection capability is provided, but detection accuracy is reduced due to interference from other vehicles
Solution Approach 1:
The patent segments the detection system by assigning unique identification patterns (specific chirp signal characteristics) to each vehicle's ultrasonic waves. This allows the receiving device to distinguish between waves from different vehicles, effectively segmenting the interference problem into identifiable sources that can be filtered or selectively processed.
Solution Approach 2:
The patent uses frequency modulation (chirp signals with different frequency ranges or modulation patterns) as an analogous 'color' identifier for each vehicle's ultrasonic waves. By varying the frequency characteristics similarly to how different colors distinguish objects, the system can differentiate between simultaneous ultrasonic transmissions from multiple vehicles, maintaining detection accuracy despite interference.
2Adaptability or versatility
If different chirp signals are used for detection, then detection coverage is improved, but variation in detection performance increases due to sound pressure differences
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the sound pressure level of transmitted chirp signals based on detected environmental conditions and signal characteristics. The sound pressure adjustment unit modifies transmission parameters to compensate for variations introduced by different chirp signal types, ensuring that detection performance remains consistent across diverse detection scenarios while maintaining broad detection coverage.
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 approach reduces the variation in detection performance between different chirp signals, enhancing the accuracy of object detection by minimizing interference from other vehicles and maintaining consistent sound pressure levels.
Implementation Method 1
a transmission unit that transmits ultrasonic waves as search waves; a reception unit that receives ultrasonic waves and outputs a signal
Implementation Method 2
receives the reflected waves of the transmitted ultrasonic waves to detect the object that reflected the ultrasonic waves
Data Source
AI summary
An object detection device comprises a transmission sound pressure adjustment unit adjusting a sound pressure of the search wave so that the sound pressure of the search wave or a reflected wave based on the search wave is within a predetermined transmission target range. The transmission unit transmits, as the search wave, a first search wave with a first frequency changing with time at a first rate and a second search wave with a second frequency changing with time at a second rate that is different from the first rate. The transmission sound pressure adjustment unit is configured to adjust the sound pressure of each of the first and second search waves so that the sound pressure of the corresponding one of the first and second search waves or the reflected wave based on the corresponding one of the first and second search waves is within the transmission target range.