Steering System Hand Torque Adjuster Damping Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Steer-by-wire steering systems lack effective feedback mechanisms that simulate the driving feel of conventional mechanical systems, particularly in cases of hand torque adjuster failure, leading to reduced driving safety and controllability.
Innovation Solution
The method adjusts the damping force generated by the hand torque adjuster based on the performance of the wheel angle adjuster, using signals from the wheel angle adjuster and actuation torque from the driver to provide adaptive haptic feedback, ensuring the driver perceives the effort required to achieve the desired steering angle, and dynamically adjusts the transmission ratio with speed to optimize steering behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the hand torque adjuster exerts a damping force to simulate driving feel, then the driving safety and controllability are improved, but the energy consumption increases
Solution Approach 1:
The damping force is dynamically adjusted based on vehicle speed, steering angle, and steering angular velocity. At low vehicle speeds, the damping force is reduced to minimize energy consumption, while at high vehicle speeds, the damping force is increased to enhance driving safety and stability during emergency maneuvers.
Solution Approach 2:
The control unit modifies the damping force parameter according to multiple operating conditions including vehicle speed, steering angle, and steering angular velocity. This allows the system to optimize the balance between energy consumption and driving safety by adapting the damping characteristics to the current driving situation.
2Stability of the object's composition
If the damping force is increased to prevent unintentional movements, then the steering stability is improved, but the ease of operation deteriorates
Solution Approach 1:
The damping force is dynamically adjusted based on vehicle speed and steering conditions. At low vehicle speeds, the damping force is reduced to maintain ease of operation for parking and low-speed maneuvers, while at high vehicle speeds, the damping force is increased to prevent unintentional movements and enhance steering stability.
Solution Approach 2:
The system applies preliminary anti-action by detecting steering angular velocity and applying opposing damping force when excessive steering input is detected. This prevents unintentional movements while allowing normal steering operations to proceed smoothly by only intervening when necessary.
3Reliability
If the hand torque adjuster provides haptic feedback based on wheel angle adjuster performance, then the driving safety is improved, but the device complexity increases
Solution Approach 1:
The control unit performs multiple functions including calculating wheel angle, calculating steering angular velocity, determining damping force, and controlling the hand torque adjuster. This multi-functionality reduces the need for separate dedicated components, thereby managing system complexity while providing comprehensive safety feedback.
Solution Approach 2:
The system implements feedback by continuously monitoring the performance of the wheel angle adjuster and using this information to adjust the damping force provided by the hand torque adjuster. This feedback mechanism enhances driving safety by providing real-time haptic feedback about steering system status and performance.
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 enhances driving safety and controllability by providing intuitive feedback and adapting the steering system's response to the driver's inputs, minimizing energy consumption and preventing unintentional movements, while maintaining a natural haptic experience akin to mechanical steering.
Implementation Method 1
a hand torque adjuster (4) assigned to the steering handle (2), which is designed to exert a damping force on the steering handle (2)
Data Source
AI summary
The disclosure relates to a method for operating a steering system for a motor vehicle, which steering system has, on the one hand, a steering handle which can be operated by a driver of the motor vehicle, and a hand torque adjuster which is assigned to the steering handle and is designed to apply a damper force, counteracting the operation by the driver, to the steering handle, and, on the other hand, a wheel angle adjuster which is coupled to at least one steerable wheel of the motor vehicle and which is electrically actuated as a function of operation of the steering handle in order to set a steering angle of the at least one wheel. There is provision that the damper force is generated by the manual torque adjuster as a function of a current performance of the wheel angle adjuster.