Ultrasonic Sensor Control Device Frequency Shift for Direct Wave Interference
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Solution Overview
Problem
Existing ultrasonic sensor devices face accuracy issues in distance measurement due to the influence of direct waves and reverberations, which can be exacerbated by incorrect setting of threshold values and mask periods.
Innovation Solution
An ultrasonic sensor control device that changes the reception frequency to a different frequency during the transmission period and a subsequent period until reverberations are reduced, using a device control section to set frequencies for both transmission and reception ultrasonic waves, thereby minimizing the impact of direct waves and reverberations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the threshold value and mask period are adjusted according to the expected distance to reduce direct wave influence, then the accuracy in distance measurement is improved, but the device complexity increases due to the need for parameter adjustment mechanisms
Solution Approach 1:
The patent applies dynamics by making the reception frequency variable rather than fixed. The reception frequency is dynamically changed to a frequency different from the transmission frequency during the transmission period and until reverberations are reduced. This dynamic frequency adjustment automatically adapts to different measurement conditions without requiring manual parameter setting, thereby improving measurement accuracy while avoiding the complexity of adjustment mechanisms.
Solution Approach 2:
The patent changes the reception frequency parameter from being equal to the transmission frequency to being different from it during the critical period. This parameter change effectively reduces the influence of direct waves and reverberations on the measurement, improving accuracy without adding mechanical adjustment complexity since the change is implemented through control signals.
2Reliability
If the reception frequency is set equal to the transmission frequency to maximize signal reception, then the sensitivity of the ultrasonic sensor is improved, but the harmful influence of direct waves and reverberations increases
Solution Approach 1:
The patent applies preliminary anti-action by proactively changing the reception frequency to a different frequency before the direct wave and reverberations can interfere with the measurement. The frequency is changed in advance during the transmission period and until reverberations are reduced, preventing the harmful factors from affecting the measurement rather than trying to eliminate them after interference occurs.
Solution Approach 2:
The patent converts the potentially harmful frequency overlap between transmission and reception into a benefit by intentionally using different frequencies during the critical period. This frequency differentiation allows the system to exploit the direct wave and reverberation energy at the transmission frequency while remaining insensitive to them during reception, effectively turning the harmful frequency coincidence into a useful separation mechanism.
3Object-affected harmful factors
If the reception frequency is changed to a different frequency during the transmission period to reduce direct wave influence, then the harmful factors are reduced, but the device complexity increases due to frequency control mechanisms
Solution Approach 1:
The patent applies universality by designing the frequency control mechanism to serve multiple functions simultaneously. The same frequency control system that changes the reception frequency to reduce direct wave influence also manages the overall ultrasonic sensor operation, including coordination between transmission and reception phases. This multi-functionality reduces the need for separate dedicated components for each function, thereby limiting the increase in device complexity.
4Measurement precision
If the threshold value is adjusted to filter out direct waves, then the measurement accuracy is improved, but the ease of operation decreases due to the need for precise parameter setting
Solution Approach 1:
The patent applies self-service by making the ultrasonic sensor automatically adjust its reception frequency without requiring user intervention for parameter setting. The system autonomously changes the reception frequency to a different frequency during the transmission period and until reverberations are reduced, eliminating the need for users to manually set threshold values or other parameters. This self-adjusting capability maintains high measurement accuracy while significantly improving ease of operation.
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 allows for accurate distance measurement by reducing the influence of direct waves and reverberations, enhancing the precision of ultrasonic sensor systems.
Implementation Method 1
a transmission control section configured to control transmission of a transmission ultrasonic wave at a first frequency through the ultrasonic sensor device
Implementation Method 2
an ultrasonic sensor device that includes diaphragms and which transmits and receives ultrasonic waves through vibration of the diaphragms
Implementation Method 3
The device control section changes the reception frequency in such a manner that the reception frequency is a frequency different from the first frequency during a first period including at least a transmission period during which the transmission ultrasonic wave is transmitted
Data Source
AI summary
Disclosed herein is an ultrasonic sensor control device that controls an ultrasonic sensor device configured to transmit and receive ultrasonic waves. The ultrasonic sensor control device includes a transmission control section configured to control transmission of a transmission ultrasonic wave at a first frequency through the ultrasonic sensor device, a reception section configured to receive a reception ultrasonic wave through the ultrasonic sensor device, and a device control section configured to control the ultrasonic sensor device to set given frequencies as a transmission frequency of the transmission ultrasonic wave and a reception frequency of the reception ultrasonic wave. The device control section changes the reception frequency in such a manner that the reception frequency is a frequency different from the first frequency during a first period including at least a transmission period during which the transmission ultrasonic wave is transmitted.