Vehicle Control Device for Lateral G Force Management
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Solution Overview
Problem
During automated driving, especially when a vehicle changes lanes along a curve, large lateral G forces can cause the driver's riding posture to collapse or become disarrayed, as there is no control mechanism to manage these forces effectively.
Innovation Solution
A vehicle control device that includes a trajectory generating unit, a vehicle motion determining unit, and a grasping request unit, which detects and responds to lateral G forces by requesting the driver to grasp the steering wheel, and adjusts vehicle motion based on whether the steering wheel is grasped, allowing for appropriate control and posture maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If automated lane change control is performed during curved road travel, then lane changing capability is improved, but driver riding posture stability deteriorates due to large lateral G forces
Solution Approach 1:
The system performs preliminary assessment of lateral G forces based on planned trajectory before executing the lane change. When large lateral G forces are predicted, the system proactively requests the driver to grasp the steering wheel in advance, allowing the driver to prepare physically for the upcoming motion and maintain stable posture throughout the maneuver.
Solution Approach 2:
The system continuously monitors the actual vehicle motion during lane change and compares it with the planned trajectory. Based on this feedback, the system adjusts the lane change execution in real-time to minimize excessive lateral movements, thereby reducing the impact on driver posture stability while maintaining lane changing capability.
2Extent of automation
If lane change trajectory is executed without driver intervention, then automation level is improved, but driver control and posture maintenance capability deteriorates
Solution Approach 1:
The system dynamically adjusts the level of automation based on real-time conditions. During normal lane changes, full automated control is provided. However, when large lateral G forces are predicted or detected during curved road lane changes, the system transitions to a semi-automated mode by requesting driver steering wheel grasping, thereby adapting the automation level to match the operational requirements and maintain driver posture control.
3Stability of the object's composition
If lateral G force management is added to lane change control, then driver posture stability is improved, but system complexity increases
Solution Approach 1:
The system introduces a lateral G force calculation module that acts as an intermediary between the trajectory planning and execution systems. This module calculates predicted lateral G forces based on the planned trajectory and vehicle parameters, and triggers appropriate control adjustments without requiring complex real-time sensing or advanced control algorithms, thereby managing driver posture stability with moderate system complexity.
Data Source
AI summary
A vehicle motion determining unit determines a value indicative of a motion of the vehicle that occurs in the vehicle transverse direction of a host vehicle, on the basis of a planned travel trajectory generated by a trajectory generating unit at a time of making a lane change. The grasping request unit outputs a grasping request to the notification control unit to request grasping of the steering wheel in the case that the value indicative of the vehicle motion is greater than or equal to a predetermined value.