Steer-by-Wire Damping Control for Shutdown Energy Management
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Solution Overview
Problem
Steer-by-wire steering systems in vehicles face challenges in managing steering wheel movement during shutdown states, where mechanical damping is inefficient and consumes energy, and undamped rotation can damage components or be perceived as unsophisticated.
Innovation Solution
A method that monitors steering wheel movement after shutdown, damping only when movements exceed defined limiting values, and discontinues monitoring and damping if no user-induced movements are detected, using existing sensors and a timer to optimize energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the damping unit is permanently activated to damp steering wheel movement in shut-down state, then the steering wheel is protected from undamped striking and component damage is avoided, but the vehicle battery discharges due to continuous energy consumption
Solution Approach 1:
The damping unit is activated periodically rather than continuously. The control unit monitors steering wheel position at defined intervals and activates damping only when movement exceeds a threshold value, thereby protecting components while minimizing energy consumption during shut-down state
Solution Approach 2:
The damping unit transitions from a static permanently activated state to a dynamic state where it is activated only when needed. The system adapts its damping behavior based on real-time steering wheel movement detection, activating only when movement exceeds the threshold value
2Use of energy by moving object
If the damping unit is completely deactivated in shut-down state to save energy, then battery discharge is prevented, but the steering wheel can rotate freely causing component damage and undamped striking
Solution Approach 1:
The damping unit transitions from a static completely deactivated state to a dynamic state where it activates only when steering wheel movement exceeds the threshold value, thereby saving energy while providing protection when needed
Solution Approach 2:
The system uses the steering wheel's own movement characteristics to trigger damping activation. When movement exceeds the threshold, the system automatically activates damping without external intervention, and the monitoring continues to detect when damping is no longer needed
3Reliability
If continuous monitoring of steering wheel movement is performed in shut-down state, then user-induced movements are detected and damped, but energy is consumed during extended vehicle shutdowns
Solution Approach 1:
The monitoring system operates periodically at defined intervals rather than continuously. The control unit checks steering wheel position at specific time intervals and activates damping only when movement exceeds the threshold, reducing energy consumption while maintaining detection capability
Solution Approach 2:
The continuous monitoring function is extracted and replaced with periodic sampling. Only essential monitoring at defined intervals is maintained, removing unnecessary continuous energy consumption while preserving the ability to detect significant user-induced movements
4Use of energy by moving object
If the steering wheel is allowed to rotate freely in de-energized state, then energy consumption is minimized, but mechanical components are not treated with care and undamped striking occurs
Solution Approach 1:
The damping behavior transitions from static (either always on or always off) to dynamic, where damping force is applied only when steering wheel movement exceeds the threshold value, thereby protecting components while minimizing energy consumption
Solution Approach 2:
The damping threshold parameter is optimized to distinguish between normal vibrations and significant user-induced movements. By setting an appropriate threshold value, the system allows free rotation for minor movements while activating damping only when protection is actually needed
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
This approach ensures the steering system is protected from damage while minimizing energy consumption by only damping significant user-induced movements, maintaining a sophisticated feel and reducing battery discharge during extended vehicle shutdowns.
Implementation Method 1
the steering wheel is actively damped by a damping unit, in order to simulate a roadway resistance or a resistance of the steering system on the steering wheel
Data Source
AI summary
A method is disclosure for operating a steer-by-wire vehicle steering system with a steering wheel in a shut-down state of the vehicle. According to one step of the method, after the vehicle has been shut down a procedure is carried out to monitor whether the steering wheel of the vehicle is being moved. If a movement of the steering wheel is ascertained and the movement exceeds a defined first limiting value, the movement of the steering wheel is damped by a damping unit of the steering system. If no movement of the steering wheel exceeding the first limiting value was ascertained for a defined time period, no further monitoring of a movement of the steering wheel and no further damping of the movement of the steering wheel are undertaken, so long as the vehicle is shut down. If, alternatively or additionally, a movement of the steering wheel exceeds a second limiting value, which is lower than the first limiting value, but does not exceed the first limiting value was ascertained within the defined time period and it is ascertained on the basis of an evaluation of the movement profile of the movement of the steering wheel that the movement was not caused by a user, likewise no further monitoring of a movement of the steering wheel and also no further damping of the movement of the steering wheel are undertaken, so long as the vehicle is shut down. Moreover, a steer-by-wire steering system for a vehicle is specified.