Vehicle Steering Assistance System High-Frequency Filter
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Driver assistance systems that provide continuous steering assistance can cause unsettling high-frequency steering movements, leading to driver insecurity due to their ability to process and correct steering information faster than human drivers, resulting in frequent and irritating wheel movements.
Innovation Solution
A driver assistance system that differentiates between low-frequency and high-frequency components of steering angle changes, using a high-pass filter or low-pass filter to suppress high-frequency movements, ensuring the steering wheel reflects only low-frequency changes, thus mimicking the driver's intended movements and reducing driver anxiety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the driver assistance system continuously processes steering information and performs corrective steering movements with high frequency, then the system can maintain accurate vehicle positioning and road following, but the frequent steering movements cause trembling of the steering wheel that gives vehicle occupants a feeling of insecurity
Solution Approach 1:
The patent segments the steering control into two independent actuating drives: a first actuating drive for collision hazard response and a second actuating drive for continuous road following. This segmentation allows the system to separate safety-critical functions from comfort-critical functions, enabling the second drive to provide smooth, filtered steering movements for positioning while the first drive handles urgent corrections without causing perceptible trembling to the driver
Solution Approach 2:
The patent applies parameter changes by filtering the steering commands from the second actuating drive to reduce high-frequency components. The system modifies the frequency characteristics of the steering movements, allowing low-frequency positional corrections while suppressing high-frequency trembling that causes driver insecurity, thus optimizing both positioning accuracy and driver comfort
2Productivity
If the driver assistance system performs frequent corrective steering movements to maintain accurate positioning, then the vehicle can follow the road course precisely, but the steering wheel trembling irritates the driver and reduces acceptance
Solution Approach 1:
The system segments steering corrections into two categories handled by different actuating drives: urgent safety corrections (first drive) and routine positioning corrections (second drive). The second drive operates continuously at high frequency for accurate road following but uses filtered commands to avoid irritating the driver, while the first drive provides backup safety corrections when needed
Solution Approach 2:
The patent introduces a filtering mechanism as an intermediary between the steering angle calculation and the second actuating drive. This intermediary processes the steering commands, allowing frequent corrections for accurate positioning while smoothing out high-frequency components that would cause perceptible trembling and driver irritation
3Ease of operation
If the steering wheel is mechanically coupled to the steerable wheels with fixed transmission ratio, then the driver has direct control feedback, but the driver's hands are at risk of injury during unexpected autonomous steering interventions
Solution Approach 1:
The patent segments the steering control into two independent actuating drives that can operate separately. The first actuating drive handles autonomous collision avoidance steering interventions without requiring driver input, while the second actuating drive handles continuous road following. This segmentation allows the system to perform autonomous safety corrections without mechanically coupling the driver's hands to unexpected steering movements, eliminating injury risk while preserving driver control when needed
Solution Approach 2:
The superimposition gear acts as a mechanical intermediary that combines the outputs of two independent actuating drives. This intermediary allows the first actuating drive to perform autonomous steering interventions without directly coupling to the driver's steering wheel input, preventing driver hand injury during unexpected autonomous corrections while maintaining the ability to provide smooth filtered movements through the second drive
Data Source
AI summary
A driver assistance system for a vehicle includes a steering assistance system for autonomously generating steering commands, a first actuating drive for adjusting a steering angle on a steerable wheel of the vehicle corresponding to the steering commands and a steering wheel that is rotatable coupled to the steering angle by a second actuating drive. The steering assistance system actuates the second actuating drive in order to favor a low-frequency component of a frequency spectrum of changes of the steering angle in the rotation of the steering wheel than a high-frequency component of the frequency spectrum.