Travel Control Device Acceleration Limiting for Stability
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Solution Overview
Problem
Existing vehicle control systems do not effectively combine acceleration/deceleration control with departure suppression control and turning control, lacking a method to prioritize stability during departure suppression or obstacle avoidance processes.
Innovation Solution
A travel control device and method that integrates acceleration/deceleration control, travel lane detection, and turning control, where acceleration is limited during departure suppression or obstacle avoidance processes to prioritize stability, and then relaxed based on the process outcome and driver operation, incorporating automatic braking and operation history.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If acceleration/deceleration control is executed to automatically accelerate and decelerate the vehicle, then the vehicle velocity can be automatically controlled, but the vehicle stability during departure suppression or obstacle avoidance processes deteriorates
Solution Approach 1:
The patent applies dynamics by making the acceleration limitation status changeable based on control process conditions. The acceleration/deceleration control unit dynamically adjusts whether to limit acceleration based on whether departure suppression or obstacle avoidance processes are being executed, allowing the system to adapt its automation behavior to current operational contexts and maintain stability when needed.
Solution Approach 2:
The patent uses an intermediary control mechanism where the acceleration/deceleration control unit acts as a mediator between the automatic velocity control and the departure suppression/obstacle avoidance processes. By introducing this intermediate control layer that can limit acceleration based on the execution status of other control processes, the system resolves the conflict between automatic control and stability requirements.
2Stability of the object's composition
If departure suppression control or obstacle avoidance control is prioritized, then vehicle stability improves, but the time to reinitiate normal acceleration/deceleration control increases
Solution Approach 1:
The patent implements feedback by continuously monitoring the execution status of departure suppression and obstacle avoidance processes, and using this information to control the acceleration limitation. When these special control processes complete or are suspended, the feedback mechanism automatically removes the acceleration limitation, allowing normal acceleration to resume without manual intervention and minimizing time loss.
3Stability of the object's composition
If acceleration is limited during departure suppression or obstacle avoidance processes, then vehicle stability improves, but the productivity of the acceleration/deceleration control decreases
Solution Approach 1:
The patent applies partial action by selectively limiting acceleration only during specific control processes (departure suppression and obstacle avoidance) rather than continuously. This partial limitation approach maintains vehicle stability when needed while preserving normal acceleration performance during other operations, thus balancing stability requirements with overall control productivity.
Data Source
AI summary
A vehicle control device includes a travel control processing unit configured to control traveling of a host vehicle in accordance with an automated driving mode, where a travel control for the vehicle is performed at least partially automatically by way of automated driving, or a manual driving mode, where traveling of the vehicle is performed based on an operating device which is operated by a vehicle occupant, and an operation amount acquisition unit for acquiring an operation amount by which the operating device is operated by the vehicle occupant. On the basis of the operation amount acquired by the operation amount acquisition unit when switching from the manual driving mode to the automated driving mode, the travel control processing unit sets a first O/R threshold value for the operation amount at a time of canceling at least a portion of the automated driving mode.