Steering Torque Haptic Feedback for Mode Switch Recognition
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Solution Overview
Problem
Current active and semi-active steering systems in vehicles do not provide a clear and intuitive haptic feedback to drivers when switching between different driving dynamics modes, leading to potential confusion and misunderstandings about the mode change.
Innovation Solution
Implementing a method where the steering torque or pedal torque is temporarily increased or decreased in a defined manner when switching between 'Comfort' and 'Sport' modes, providing a clear haptic change that lasts for a short period, allowing drivers to recognize the mode change through enhanced steering or pedal effort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the steering torque is varied according to different characteristic curves for different driving modes, then the driving behavior can be adjusted between comfort and sport modes, but the driver cannot intuitively recognize when a mode switch has occurred
Solution Approach 1:
The patent applies a haptic feedback mechanism that generates a brief vibration or oscillation in the steering wheel when a driving mode is switched. This mechanical vibration provides tactile information to the driver, enabling intuitive recognition of the mode change without requiring visual confirmation or additional indicators.
Solution Approach 2:
The patent employs optical indicators such as LED lights that change color or illuminate to signal the current driving mode and notify the driver of mode transitions. This visual feedback complements the haptic feedback, ensuring the driver is clearly informed about the active driving dynamics characteristic.
2Loss of information
If the steering torque is increased for haptic feedback during mode switching, then the driver can recognize the mode change, but the steering becomes temporarily harder to operate
Solution Approach 1:
The patent implements a periodic haptic feedback signal that applies steering torque variations only during the brief moment of mode transition rather than continuously. The torque is increased in a pulsed manner for a short duration (e.g., 0.5-2 seconds) to provide recognition feedback, then returns to the normal torque level, minimizing impact on overall steering ease of operation.
Solution Approach 2:
The patent applies an excessive steering torque temporarily during mode switching to ensure clear haptic recognition, accepting that the steering will be harder during this brief period. This partial action is limited in time and magnitude, providing sufficient feedback while minimizing disruption to normal steering operations.
Data Source
Figure 1~3
AI summary
The method involves generating different steering moments or torques that are applied by a steering wheel or pedal. The steering moments or torques are controlled based on characteristic curves or zones to which the moments or torques are respectively assigned. One of the characteristic curves or zones is selected by a driver of a motor vehicle. A high or low steering moment or torque is generated using the steering moment or torque that is assigned to the respective characteristic curve or zone for a predetermined time period (t0). An independent claim is also included for a motor vehicle including an active or semi-active steering system.