Vehicle Control Device for Automated Driving Handover Timing
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Solution Overview
Problem
Existing vehicle control systems that transition from automated driving to manual driving based on a predetermined time period often shorten the automated driving period, leading to inefficient handover processes.
Innovation Solution
A vehicle control device that adjusts the notification timing for a driving takeover request based on the present or scheduled travel speed, allowing for either a distance-based or time-based notification, ensuring a smooth transition from automated to manual driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If notification timing is determined by a predetermined time period only, then the handover process is simplified, but the automated driving period is shortened
Solution Approach 1:
The notification timing determination is made dynamic by selecting between distance-based and time-based criteria according to the current travel speed. When travel speed exceeds a predetermined threshold, time-based notification is used; otherwise, distance-based notification is used. This dynamic adaptation allows the system to optimize both the simplicity of handover and the duration of automated driving based on real-time operating conditions.
Solution Approach 2:
The notification timing criterion is changed based on the travel speed parameter. The system switches between two different determination criteria (distance-based vs. time-based) depending on whether the travel speed exceeds a threshold value. This parameter-driven selection enables the system to maintain automated driving for longer periods while ensuring smooth handover when conditions require it.
2Duration of action of moving object
If notification timing is adjusted based on travel speed with multiple criteria, then the automated driving period is extended, but the control logic becomes more complex
Solution Approach 1:
The notification timing determination is segmented into two distinct criteria: distance-based notification and time-based notification. Each criterion is applied in specific scenarios based on travel speed. This segmentation allows the system to handle different driving conditions with appropriate simplicity, avoiding the need for a single complex determination mechanism while still achieving extended automated driving periods.
Solution Approach 2:
The control logic dynamically selects between two relatively simple determination criteria based on a single threshold comparison of travel speed. This dynamic selection approach avoids creating a single complex decision-making system, instead using two simple criteria that are appropriately applied based on real-time speed conditions, thereby managing complexity effectively.
3Ease of operation
If the time period until changeover switch operation is extended, then the handover can be smoother, but the vehicle may need to decelerate and stop on the roadside
Solution Approach 1:
The notification timing parameter is changed based on travel speed to optimize the balance between handover smoothness and vehicle speed maintenance. By using distance-based notification at lower speeds and time-based notification at higher speeds, the system ensures adequate notification time for smooth handover while minimizing unnecessary deceleration and stopping events that would disrupt normal driving flow.
Data Source
AI summary
A vehicle control device is provided with a timing selection unit configured to select, during automated driving, either one of a first notification timing at which notification of a driving takeover request is issued in the case that a remaining distance to a scheduled switching point from the automated driving to manual driving has become less than or equal to a predetermined distance, and a second notification timing at which notification of the driving takeover request is issued in the case that a remaining time period until reaching the scheduled switching point is less than or equal to a predetermined time period, wherein the timing selection unit selects the first notification timing or the second notification timing based on a present travel speed or a scheduled travel speed.