Vehicle Ultrasonic Sensor Frequency Control to Prevent Crosstalk
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The use of a single frequency for multiple ultrasonic sensors in vehicles leads to signal interference and prolonged measurement and data update times, reducing the response and update time of data.
Innovation Solution
Implementing a control system that drives multiple ultrasonic sensors at different frequencies with a guard-band in between, using a control unit to set and manage these frequencies, and employing filters to filter and validate received signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single frequency is used for multiple ultrasonic sensors, then device complexity is reduced, but signal interference occurs and response time increases
Solution Approach 1:
Each ultrasonic sensor is assigned a specific local frequency within the ultrasonic band, creating frequency-specific detection zones. This allows multiple sensors to operate simultaneously without interference, as each sensor detects echoes at its designated frequency, thereby maintaining signal accuracy while enabling parallel operation of multiple sensors.
Solution Approach 2:
The system dynamically assigns and switches between multiple frequencies for different sensor groups based on operational requirements. The control unit can adjust which frequencies are active and which sensors use them, allowing the system to optimize performance for different detection scenarios while managing frequency allocation dynamically rather than using a static single frequency for all sensors.
2Ease of manufacture
If a single frequency is used for multiple ultrasonic sensors, then manufacturing and setup are simplified, but measurement and data update times are prolonged
Solution Approach 1:
The system implements periodic frequency switching where different groups of sensors are activated at different time intervals with their respective frequencies. This allows multiple sensors to effectively operate in parallel by taking turns at different frequency slots, thereby increasing the overall data update rate without requiring all sensors to operate simultaneously at the same frequency, which would cause interference.
3Loss of time
If multiple frequencies are assigned to ultrasonic sensors, then response time and data update rate are improved, but frequency management complexity increases
Solution Approach 1:
A control unit acts as an intermediary between the multiple ultrasonic sensors and the frequency generation system. This intermediary manages the frequency allocation, switches between frequencies, and coordinates sensor activation, thereby abstracting the complexity of multi-frequency management from the sensors themselves and providing a unified interface for frequency control while enabling improved response times through parallel frequency 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 reduces measurement and data update times, enhances signal accuracy, and ensures consistent sensitivity across sensors, improving the overall performance of ultrasonic sensing systems.
Implementation Method 1
an ultrasonic transducer (20) generating ultrasonic waves
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention discloses a vehicle ultrasonic sensor control system including an ultrasonic sensor including an ultrasonic transducer generating ultrasonic waves and a control module controlling driving frequency of the ultrasonic waves emitted from the ultrasonic transducer, wherein a plurality of ultrasonic sensors are mounted on the outside of the vehicle; and a control unit setting a plurality of driving frequencies with a guard-band formed in between and controlling a control module so that the plurality of ultrasonic sensors emit and receive ultrasonic waves having driving frequencies different from each other.