Driving Assist Override Thresholds for Smooth Manual Takeover
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Solution Overview
Problem
Existing vehicle driving mode switching control systems face issues with smooth transitions to manual driving mode and erroneous detection due to the same conditions being used for both first and second driving assist modes, leading to inefficient override determination.
Innovation Solution
A vehicle driving mode switching control method that sets higher threshold values for higher assist levels, allowing override determination based on input values from the driver, specifically using sensors to detect steering wheel input and differentiate between gripping and contacting states to accurately assess the driver's intention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same threshold value is used for both first and second driving assist modes, then the system structure is simple, but the override determination accuracy deteriorates leading to erroneous detections
Solution Approach 1:
The patent applies parameter changes by setting different threshold values for steering torque based on the driving assist mode. In the first driving assist mode (hands-on mode), a first threshold value is used, while in the second driving assist mode (hands-off mode), a second threshold value is used. This differentiation of parameters enables accurate override determination for each mode, resolving the contradiction between system simplicity and determination accuracy.
2Device complexity
If the same threshold value is used for both first and second driving assist modes, then the control logic is simple, but the transition smoothness deteriorates
Solution Approach 1:
The patent implements parameter changes by establishing mode-specific threshold values for override determination. The control logic becomes more sophisticated by incorporating mode identification and corresponding threshold selection, which enables smooth transitions between driving modes by accurately detecting driver intent in each specific mode context.
3Speed
If a lower threshold value is used for higher assist levels, then the system is more responsive to driver input, but erroneous detections increase
Solution Approach 1:
The patent applies parameter changes by setting appropriate threshold values for each driving assist mode. In hands-on mode (first mode), a threshold is set that responds to genuine driver override intent while filtering out minor disturbances. In hands-off mode (second mode), a different threshold is established to accurately detect driver contact with the steering wheel. This parameter differentiation maintains response speed while eliminating erroneous detections.
Data Source
AI summary
A vehicle driving mode switching control method is provided to switch from a driving assist mode in which a driving operation performed by a driver is assisted by autonomous travel control having a plurality of assist levels to a manual driving mode in which the driver performs the driving operation. The vehicle driving mode switching control method sets a threshold value higher for a driving assist mode in which the assist level is relatively high than for a threshold value of a driving assist mode in which the assist level is relatively low. The vehicle driving mode switching control method detects an input value from the driver with respect to a steering wheel of a host vehicle, and switches from the driving assist mode to the manual driving mode when the input value from the driver is equal to or greater than the threshold value.