Driving Assistance Device Dynamic Brake Target Width
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Solution Overview
Problem
Conventional Pre-Crash Safety Systems (PCS) face issues with incorrect brake release and continuous unnecessary automatic braking due to pitching motion and low detection reliability, leading to ineffective collision determination.
Innovation Solution
A driving assistance device equipped with radar and image sensors, which calculates a predicted arrival position and adjusts the operation target width based on detection error regions, ensuring continuous and accurate automatic braking operations by enlarging the target width when detection reliability is high and reducing it when low.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If operation target width is fixed in conventional PCS, then system complexity is reduced, but detection accuracy varies under different pitching conditions
Solution Approach 1:
The operation target width transitions from a fixed parameter to a dynamic one that adjusts based on detection reliability and pitch angle. This dynamic behavior allows the system to maintain high detection precision across varying vehicle conditions without requiring complex recalibration procedures, balancing precision requirements with system manageability.
Solution Approach 2:
The system changes the operation target width parameter based on measured conditions (detection reliability and pitch angle). This parameter adaptation allows the system to maintain accurate object position detection precision under different pitching conditions while using relatively simple detection and control mechanisms.
2Reliability
If automatic brake operation is performed during large pitching motion, then collision avoidance is maintained, but detection reliability decreases due to image distortion
Solution Approach 1:
The system dynamically adjusts the operation target width based on pitch angle and detection reliability. During large pitching motion, when image distortion reduces detection precision, the system increases the target width to compensate. This dynamic adjustment maintains collision avoidance reliability by ensuring the expanded target area still captures the actual object position despite detection errors.
Solution Approach 2:
The system applies beforehand cushioning by pre-expanding the operation target width in anticipation of detection errors during pitching motion. This compensatory approach ensures that even when object position detection precision deteriorates due to image distortion, the collision avoidance function remains reliable because the expanded target area provides a safety margin.
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
The solution effectively suppresses incorrect brake release and continuous unnecessary automatic braking, maintaining reliable collision avoidance and damage reduction by adapting to changing detection reliability and vehicle motion.
Implementation Method 1
acquire detection information including an object position detected based upon a reflected wave of a radar wave transmitted frontward an own vehicle
Implementation Method 2
acquire detection information including a detected object position based upon an image capturing a frontward seen ahead from the own vehicle
Data Source
AI summary
In a driving assistance device, A arrival position calculation unit specifies an object position on an XY plane, and calculates a predicted arrival position when an object arrives at an X axis based upon a calculated travel trajectory by calculating the travel trajectory of the object. An operation permission unit permits automatic brake operation based upon a collision determination between an own vehicle and the object, when the predicted arrival position falls within a range of an operation target width. An overlapping region extraction unit sets detection error regions on the XY plane, respectively, and extracts a region where both detection error regions set are overlapped with each other as an overlapping region. A setting unit enlarges an operation target width after an automatic-brake-operation start when a characteristic amount condition relating to a size of the overlapping region is satisfied.