Diagonal Forward Object Detection to Suppress False PCS Braking
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Solution Overview
Problem
Existing vehicle collision avoidance systems using millimeter-wave radar inaccurately recognize objects, leading to unnecessary operation of collision avoidance controls due to false recognition of moving objects, such as fans or wheels, which can result in unnecessary braking.
Innovation Solution
A vehicle control device with an object detection unit and an electronic control unit that suppresses collision avoidance control when other moving or stationary objects are detected within a predetermined area of the initially recognized object, using an index value to determine the reliability of the detected object and adjusting control based on this reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If millimeter-wave radar is used to detect objects in front-and-lateral direction, then device cost is reduced, but object recognition accuracy deteriorates leading to false recognition of moving objects
Solution Approach 1:
The patent introduces an intermediary verification mechanism using camera detection as a mediator to validate millimeter-wave radar detections. The camera acts as a secondary sensor that provides visual confirmation of detected objects, thereby resolving the accuracy issue without requiring the camera to be the primary detection device. This allows the system to maintain low cost while improving reliability through cross-validation.
Solution Approach 2:
The system implements feedback by using camera detection results to verify and correct millimeter-wave radar detections. When the camera detects an object at a similar position and time, it provides feedback that confirms the radar detection is valid. This feedback mechanism reduces false recognitions of moving objects while maintaining the cost-effective radar-based primary detection system.
2Reliability
If collision avoidance control is executed based on detected moving objects, then collision risk is reduced, but false recognition causes unnecessary operation of collision avoidance control
Solution Approach 1:
The system performs preliminary verification of detected objects using camera detection before executing collision avoidance control. By checking for the presence of an object in the camera's detection range at the time of radar detection, the system preliminarily confirms the validity of the detected moving object. This preliminary action prevents unnecessary collision avoidance operations while maintaining reliable collision prevention for genuine threats.
Solution Approach 2:
The camera serves as an intermediary verification device that mediates between radar detection and collision avoidance control execution. The camera's detection results act as a gatekeeping mechanism that validates whether a radar-detected object warrants collision avoidance action, thereby eliminating false alarms without compromising genuine collision prevention.
3Measurement precision
If camera is used to recognize objects, then object recognition accuracy is improved, but device cost is increased
Solution Approach 1:
The camera serves multiple functions: it acts as both a primary detection device for high-accuracy object recognition and as a verification device for millimeter-wave radar detections. This multi-functionality justifies the camera's cost by extracting maximum value from a single device, serving dual purposes rather than requiring separate systems for each function.
Solution Approach 2:
The camera functions as an intermediary that validates radar detections, allowing the system to achieve high recognition accuracy without requiring both camera and radar to operate continuously at full capacity. The camera intervenes only when radar detection requires verification, optimizing resource usage and cost-effectiveness.
Data Source
AI summary
To suppress unnecessary operation of PCS control, provided is a vehicle control device comprising a detection unit for detecting an object located in diagonally forward of an own vehicle as a diagonally forward object; and an ECU including at least one processor. The ECU programmed to execute a collision avoidance control for avoiding a collision between own vehicle and one moving object detected as the diagonally forward object by the detection unit or reducing damage to the collision when the one moving object detected as the diagonally forward object satisfies a predetermined collision condition. The ECU programmed to suppress the collision avoidance control based on the one moving object when the other moving object or a stationary object is detected within a predetermined area in the vicinity of the one moving object by the detecting unit.