Vehicle Collision Avoidance System Ghost Detection
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Solution Overview
Problem
Existing collision avoidance systems for vehicles moving backward can erroneously detect non-existent approaching objects due to multiply reflected or diffracted radar waves, known as 'mirror ghosts', leading to unnecessary activation of driving assistance systems.
Innovation Solution
A collision avoidance system that combines radar and ultrasonic sensors with different detection areas to differentiate between actual approaching objects and mirror ghosts by estimating the presence of screens behind the vehicle, restricting driving assistance when the detected object is beyond a predetermined distance from the estimated screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radar is used to detect approaching objects behind the vehicle, then collision avoidance capability is improved, but false detection of mirror ghosts increases
Solution Approach 1:
The patent combines radar and ultrasonic sensor systems to detect approaching objects. The radar provides long-range detection while ultrasonic sensors provide short-range verification. By merging the detection data from both systems, the patent achieves both long-range collision avoidance capability and accurate object verification to eliminate mirror ghost false detections.
Solution Approach 2:
The patent introduces ultrasonic sensors as an intermediary verification system between the radar detection and the final alarm output. The ultrasonic sensors act as a mediator to confirm whether radar-detected objects are real or mirror ghosts, providing an additional layer of verification that resolves the contradiction between detection range and accuracy.
2Reliability
If driving assistance is activated for all detected objects, then safety is improved, but erroneous alarms increase due to mirror ghosts
Solution Approach 1:
The patent implements a feedback mechanism where ultrasonic sensor detection results are used to verify radar detections before triggering alarm output. The system continuously monitors both radar and ultrasonic sensor data, and only activates driving assistance when both systems confirm the presence of a real object, thereby eliminating erroneous alarms from mirror ghosts while maintaining safety.
3Measurement precision
If multiple sensors are used to verify objects, then detection accuracy is improved, but system complexity increases
Solution Approach 1:
The patent segments the detection space into long-range (radar) and short-range (ultrasonic) zones. Each sensor type is responsible for a specific detection range, with radar handling distant objects and ultrasonic sensors handling near-field verification. This segmentation allows the system to achieve high detection accuracy across all ranges while managing complexity by assigning specific roles to each sensor type.
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 reduces erroneous activation of driving assistance systems by accurately distinguishing between actual approaching objects and mirror ghosts, enhancing the reliability of collision avoidance in reverse scenarios.
Implementation Method 1
a radar that detects an object that is located behind a vehicle and that detects a distance to the detected object
Implementation Method 2
If a radio wave transmitted from the radar is multiply reflected or diffracted and then received by the radar as a reflected wave
Implementation Method 3
a plurality of ultrasonic sensors, each of which detects the object that is located behind the vehicle and detects a distance to the detected object
Data Source
AI summary
A collision avoidance system includes: a radar that detects an object that is located behind a vehicle and that detects a distance to the object; a plurality of ultrasonic sensors, each of which detects the object and detects a distance to the object, the plurality of ultrasonic sensors respectively detect different detection areas; an approaching object detection unit that detects an approaching object that approaches the vehicle from among the objects; a screen estimation unit that estimates that there is a screen that blocks an approach to the vehicle from behind; and a control unit that, when the approaching object has been detected, executes driving assistance for avoiding a collision with the approaching object, and, when a distance to the approaching object is larger by a predetermined value or more than a distance to the screen, restricts or prohibits execution of the driving assistance.