Ultrasonic Object Detection Timing for Vehicle Interference Avoidance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional object detection devices in vehicles face interference issues when both vehicles equipped with the same interference avoidance method synchronize their transmission timings, leading to ineffective interference prevention.
Innovation Solution
An object detection device that includes a control unit to adjust transmission timing with a random standby time based on vehicle states, such as normal, first approach, and second approach states, to avoid interference by delaying transmission timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both vehicles use the same interference avoidance method with fixed transmission timing adjustment, then each vehicle individually avoids interference, but transmission timings eventually coincide and interference cannot be avoided
Solution Approach 1:
The patent applies dynamics by making the standby time adjustable based on vehicle state. The control unit determines different standby times according to whether the vehicle is in a normal state, first approach state, or second approach state. This dynamic adjustment allows the system to adapt transmission timing to current operational conditions, preventing fixed timing conflicts between vehicles while maintaining reliable interference avoidance.
Solution Approach 2:
The patent changes the parameter of standby time based on vehicle state. By defining multiple vehicle states (normal, first approach, second approach) and assigning different standby time values to each state, the system transforms a static timing parameter into a dynamic one that adapts to proximity conditions, thereby resolving the contradiction between reliable interference avoidance and adaptability.
2Reliability
If transmission timing is delayed by fixed standby time to avoid interference, then transmission timing is adjusted, but transmission efficiency decreases due to excessive delays
Solution Approach 1:
The system dynamically adjusts standby time based on vehicle state rather than using a fixed delay. In normal states with no proximity concern, shorter standby times maintain transmission efficiency. In approach states where interference risk exists, longer standby times ensure reliable avoidance. This dynamic approach optimizes the balance between interference avoidance reliability and transmission efficiency.
Solution Approach 2:
The standby time parameter is changed according to vehicle state conditions. By setting different standby time values for different states (normal, first approach, second approach), the system ensures sufficient delay only when necessary for interference avoidance, thereby maintaining high transmission efficiency during normal operation while ensuring reliable interference avoidance when needed.
3Reliability
If standby time is increased to ensure interference avoidance, then interference prevention is improved, but response time to detect objects increases
Solution Approach 1:
The system uses dynamic standby time adjustment based on vehicle state to minimize detection response time loss. In normal states where no other vehicle is nearby, shorter standby times are used, reducing the time loss for detection. In approach states where interference risk exists, longer standby times ensure reliable avoidance. This dynamic approach ensures interference avoidance reliability while minimizing unnecessary time delays.
Solution Approach 2:
The standby time parameter is optimized by changing its value according to vehicle state. By setting appropriate standby times for different states, the system achieves reliable interference avoidance only when necessary, thereby reducing the overall loss of detection response time compared to using a consistently long standby time.
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
Effectively prevents ultrasonic wave interference between vehicles equipped with the same detection device by dynamically adjusting transmission timing based on vehicle proximity, enhancing interference avoidance reliability.
Implementation Method 1
transmitting a transmission wave such as an ultrasonic wave from the vehicle and receiving a reception wave (reflected wave) generated by reflection of the transmission wave against the object
Implementation Method 2
calculates a distance to the object based on the transmission wave and the reception wave
Data Source
AI summary
An object detection device includes: a control unit that controls a transmission/reception unit to transmit a transmission wave at a predetermined transmission timing; a distance calculation unit that calculates a distance to an object based on the transmission wave and a reception wave; and a determination unit that determines a random time according to each of a normal state in which the distance to the object exceeds a first distance or the object is not detected, a first approach state in which the distance to the object is smaller than or equal to the first distance, and a second approach state in which the distance to the object is smaller than or equal to a second distance smaller than the first distance. The control unit controls the transmission/reception unit to transmit the transmission wave at a new transmission timing obtained by delaying the transmission timing by the determined random time.