Electric Drive Torque Vibration for Haptic Feedback
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Solution Overview
Problem
Electrically driven vehicles lack a method to provide haptic feedback during the preparation phase for starting, making it difficult for drivers to set the desired drive torque and enhancing the driving experience.
Innovation Solution
A device that detects simultaneous actuation of the brake and accelerator pedals to activate a preparation mode, operating the electric drive machine with a time-modulated target drive torque, including a DC component and an AC component, to produce vibrations as haptic feedback, while ensuring the torque does not exceed the brake torque, and optionally deactivating or intensifying active oscillation dampers for enhanced feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If an electric drive machine operates in preparation mode with increased drive torque before starting, then the starting time is shortened and acceleration is improved, but the driver receives no haptic feedback to precisely set the desired drive torque
Solution Approach 1:
The patent applies mechanical vibration by superimposing an AC component on the DC drive torque to generate vibrations in the drive train that are perceptible to the driver. These vibrations serve as haptic feedback, allowing the driver to precisely sense and control the drive torque level during the preparation phase, while the DC component provides the increased torque needed for reduced starting time.
2Speed
If the drive torque is increased during preparation phase, then accelerated starting is achieved, but the vehicle may move unintentionally if torque exceeds brake torque
Solution Approach 1:
The control device continuously monitors the brake torque and adjusts the DC drive torque component to remain below the brake torque threshold. This feedback mechanism ensures that while the drive torque is increased for accelerated starting, it never exceeds the braking force, preventing unintended vehicle movement and maintaining stable stationary position during preparation.
3Ease of operation
If oscillation dampers are deactivated to enhance haptic feedback, then driving experience is improved, but vehicle vibration control is reduced
Solution Approach 1:
The patent dynamically controls the oscillation dampers by deactivating them only during the preparation phase when haptic feedback is needed for drive torque control. During normal operation, the dampers remain active to control vibrations. This dynamic switching optimizes both driving experience during preparation and vibration control during normal operation, managing system complexity through conditional activation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise setting of drive torque for accelerated starting and improves the driving experience by providing strong haptic feedback, ensuring the vehicle remains stationary and transitioning smoothly to the starting process.
Implementation Method 1
operate the electric drive machine with a time-modulated target drive torque... to bring about vibrations of the vehicle as haptic feedback
Data Source
AI summary
A device for operating an electric drive machine of a vehicle in preparation for a start-up process of the vehicle is configured to determine that a preparation mode of the vehicle for preparing for the start-up process is active, and in response, operate the electric drive machine with a time-modulated target drive torque in a preparation phase for the start-up process in order to create vibrations of the vehicle by the drive machine as haptic feedback for a driver of the vehicle when the vehicle is stationary.