Target Pathway Generating Device for Smooth Vehicle Speed Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Autonomous driving control systems cause discomfort to users when updating vehicle pathways due to potential delays in calculating new trajectories, leading to inconvenient and excessive deceleration or stopping, which can result in poor ride quality.
Innovation Solution
A target pathway generating device that sets a target vehicle speed at the endpoint of a section based on upcoming stop points and deceleration points, allowing for smooth control even if new pathway calculations are not completed, thereby preventing unnecessary deceleration and reducing user discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle stops uniformly at the endpoint of the section when new target pathway calculation is not completed, then the calculation reliability is improved, but the ride quality deteriorates due to excessive deceleration and user discomfort
Solution Approach 1:
The system performs preliminary action by setting a predetermined target vehicle speed at the section endpoint before the pathway update is completed. This pre-set speed profile allows the vehicle to maintain smooth deceleration even when the new target pathway calculation is delayed, thereby preserving ride quality while ensuring calculation reliability is not compromised
Solution Approach 2:
The system dynamically adjusts the target vehicle speed based on whether the new target pathway has been calculated. When calculation is complete, the system uses the new pathway; when incomplete, it transitions to using the predetermined target speed at the endpoint. This dynamic switching resolves the contradiction by adapting the control strategy to the calculation status
2Speed
If the target pathway is updated at a pathway update point before the endpoint, then the responsiveness is improved, but the ride quality deteriorates due to potential calculation delays causing unnecessary stops
Solution Approach 1:
When the target pathway is updated at the pathway update point before the endpoint, the system performs preliminary action by pre-calculating and setting the target vehicle speed at the section endpoint. This ensures that even if the new pathway calculation takes time, the vehicle has a predetermined speed profile to follow, preventing unnecessary stops and maintaining ride quality while preserving responsiveness
Solution Approach 2:
The predetermined target vehicle speed at the endpoint acts as an intermediary between the pathway update point and the actual endpoint. It serves as a fallback control parameter that bridges the gap when new pathway calculations are delayed, allowing the system to maintain smooth operation without compromising responsiveness or ride quality
Data Source
Figure 1
Figure 2
Figure 3
AI summary
As described above, the target vehicle speed generating device (12) comprises a generating unit (32) that generates a target pathway at a predetermined timing for controlling the driving of a vehicle in a predetermined section, and a setting unit (30) that sets in advance a target vehicle speed in advance at a section endpoint of the section in which the vehicle is currently driving, which is used when the generating unit (32) cannot generate a target pathway at the predetermined timing, wherein the setting unit (30) sets the target vehicle speed based on road information in the predetermined section.