Ultrasonic Object Detection Stepwise Frequency Control
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Solution Overview
Problem
Ultrasonic object detecting apparatuses face interference issues that degrade detection accuracy, particularly when multiple sensors transmit and receive ultrasonic waves, making it difficult to achieve desired frequency changes and identification properties.
Innovation Solution
The apparatus employs a driving signal generation unit that produces a stepwise frequency driving signal for the transmitter unit, allowing the transmitter to operate effectively outside the resonant frequency range, thereby improving trackability and identification properties by rapidly changing the driving frequency between predetermined first and second frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ultrasonic sensors transmit ultrasonic waves for object detection, then detection capability is improved, but interference from other sensors degrades detection accuracy
Solution Approach 1:
The patent applies dynamics by making the driving frequency variable rather than fixed. The driving signal generation unit dynamically changes the frequency of the driving signal based on feedback from the resonance frequency detection, allowing the transmitter to operate at optimal frequencies that avoid interference from other sensors while maintaining effective ultrasonic wave transmission for object detection
Solution Approach 2:
The patent implements parameter changes by modifying the frequency parameter of the driving signal. The system detects the resonance frequency of the transmitter and adjusts the driving frequency to a value different from the resonance frequency, thereby changing the operating parameters to eliminate interference while preserving detection capability
2Reliability
If the driving frequency is changed to avoid interference, then identification properties improve, but it becomes difficult to achieve desired frequency changes when operating near resonant frequency
Solution Approach 1:
The patent employs feedback by detecting the resonance frequency of the transmitter and using this information to determine the appropriate driving frequency. The driving signal generation unit receives feedback about the resonance frequency and automatically adjusts the driving frequency to a value that provides good identification properties while avoiding interference, simplifying the frequency control process
Solution Approach 2:
The patent applies preliminary action by pre-determining the relationship between resonance frequency and optimal driving frequency. The system performs resonance frequency detection first, then uses this preliminary information to set the driving frequency before actual object detection begins, ensuring optimal identification properties from the start
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 configuration enhances the identification properties of the transmission waves, effectively mitigating interference and improving detection accuracy by achieving a desired width of frequency change in the transmission waves.
Implementation Method 1
a transmitter unit (20A) that is driven with a driving signal generated by the driving signal generation unit (3) and emits transmission waves externally
Data Source
AI summary
An object detecting apparatus is configured to detect a surrounding object. The object detecting apparatus is provided with a driving signal generation unit provided to generate a driving signal that drives a transmitter unit including a transmitter emitting transmission waves externally; and a control unit provided to control an output of the driving signal transmitted to the transmitter unit from the driving signal generation unit. The driving signal generation unit is configured to generate the driving signal of which the frequency changes stepwise.