Vehicle Radar Moving Direction Detection Invalidation Logic
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Solution Overview
Problem
Existing vehicle collision avoidance systems using radar sensors face accuracy issues in determining the moving direction of objects due to the position of reflection points not corresponding to the actual closest point on the object, leading to errors in drive support control.
Innovation Solution
A moving object detection apparatus that calculates the moving direction of objects using radar sensor data and sets an invalidation time period or section based on detection start distance and relative speed to prevent the use of potentially inaccurate direction data in drive support control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the moving direction is calculated based on radar detection information after object detection starts, then the drive support control can be performed, but the accuracy of the calculated moving direction deteriorates due to reflection point position errors
Solution Approach 1:
The system performs preliminary action by setting an invalidation time period and invalidation section in advance before object detection occurs. When an object is detected, the system checks whether the object exists within the predetermined invalidation section or within the time period from detection start timing, and if so, prohibits moving direction calculation. This preliminary setup prevents the use of inaccurate detection information during the critical period when reflection point positions are unreliable, thereby resolving the contradiction between maintaining drive support control functionality and ensuring moving direction accuracy.
2Reliability
If the invalidation time period is set longer to avoid using inaccurate data, then the reliability of drive support control improves, but the time for accurate detection is delayed
Solution Approach 1:
The system applies dynamics by making the invalidation time period variable rather than fixed. The invalidation time period is set based on the detection start distance: when the detection start distance is larger, the invalidation time period is set longer; when the detection start distance is smaller, the invalidation time period is set shorter. This dynamic adjustment allows the system to maintain high reliability by using longer invalidation periods for distant objects while reducing time loss for closer objects, thereby resolving the contradiction between reliability and response 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
This approach reduces the probability of using inaccurate moving direction data in collision avoidance systems, enhancing the reliability and accuracy of drive support control by adapting to the reflection point unstable section, thereby improving safety and reducing unnecessary deceleration control.
Implementation Method 1
a radar sensor on a rear portion thereof... detection information of the radar sensor
Implementation Method 2
a position of a reflection point that defines a distance between the radar sensor and the object
Data Source
AI summary
A moving object detection apparatus is configured to calculate, based on detection information of an object from a radar sensor, a moving direction of the object with respect to a host vehicle to generate object information, the object information including information representing the calculated moving direction; set an invalidation time period or an invalidation section; and prevent a calculation of the moving direction during a period from the detection start timing to an invalidation end timing, the invalidation end timing being at a lapse of the invalidation time period or a timing when the object exists from the invalidation section, or prevent the moving direction calculated by the object information generating part from being used in a drive support control during the period from the detection start timing to the invalidation end timing.