Curved-Road Speed Control Using Vehicle Course-Based Deceleration
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Solution Overview
Problem
Existing vehicle driving assistance systems fail to adjust vehicle deceleration appropriately based on the actual course of the vehicle, leading to unsuitable deceleration when navigating curved roads.
Innovation Solution
A vehicle driving assistance apparatus that adjusts deceleration based on the actual vehicle course and road curvature, using an electronic control unit to control deceleration within a drivable area and correct deceleration characteristics to ensure suitable deceleration on curved roads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the target speed or target deceleration rate is set based on the curvature of the curved road, then the vehicle can maintain a suitable speed on curved roads, but the deceleration may not be suitable when the vehicle's actual course varies due to steering angle
Solution Approach 1:
The patent applies dynamics by making the deceleration control adaptive and variable based on the vehicle's actual moving course. The electronic control unit continuously monitors whether the vehicle course is within the drivable area and adjusts the deceleration rate accordingly, transitioning from a static curvature-based control to a dynamic course-based control that adapts to real-time driving conditions
Solution Approach 2:
The patent implements feedback by using the detected vehicle moving course information to adjust the deceleration control. The system feeds back the actual vehicle position and course data to the electronic control unit, which then modifies the target deceleration rate based on whether the course remains within the drivable area, creating a closed-loop control system
2Speed
If the vehicle moving speed is controlled to target speed using curvature-based calculation, then speed control can be maintained, but the deceleration does not account for variations in vehicle course due to steering angle
Solution Approach 1:
The patent applies preliminary action by calculating the vehicle's moving course in advance from the current position to a predetermined distance ahead. This predicted course information is used proactively to adjust the deceleration control before the vehicle actually deviates, allowing the system to prepare appropriate deceleration rates based on anticipated driving conditions
Solution Approach 2:
The patent implements parameter changes by modifying the target deceleration rate parameter based on the vehicle course position. When the course is within the drivable area, a first target deceleration rate is used; when the course exceeds the outer boundary, a second target deceleration rate is applied, thereby changing the control parameter to match the actual driving conditions
Data Source
AI summary
A vehicle driving assistance apparatus executes a speed control of controlling a moving speed of an own vehicle to a target speed or less when the own vehicle moves on a curved road, and the moving speed of the own vehicle is greater than the target speed. While executing the speed control, the vehicle driving assistance apparatus controls a deceleration of the own vehicle by the speed control such that a deceleration of the own vehicle realized when an own vehicle moving course is within a drivable area of the curved road, is smaller than the deceleration of the own vehicle realized when a part of the own vehicle moving course is out of an outer boundary of the drivable area.