Steering Assist Control With FFT-Based Actuator Diagnosis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for a systematic and accurate diagnosis method for vehicle steering systems, particularly in electric power steering systems, to ensure stability and efficiency.
Innovation Solution
A steering control device and method that includes input-side and output-side steering actuators, with a determiner and diagnostic controller to analyze the response of the output-side steering actuator in a frequency domain and compare it with preset normal data for accurate diagnosis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frequency domain analysis is used to diagnose the steering system, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical diagnosis methods with frequency domain analysis using Fast Fourier Transform (FFT). The controller transforms time-domain signal data from sensors into frequency-domain data to identify abnormal frequencies, substituting physical inspection complexity with computational analysis that improves measurement precision while managing system complexity through software-based processing.
2Reliability
If ground checking is performed to ensure system stability, then reliability is improved, but loss of time occurs
Solution Approach 1:
The patent implements ground checking as a preliminary action before normal steering operation. The controller checks whether the vehicle is on level ground by analyzing the relationship between steering wheel angle and steering actuator position when the vehicle is stationary. This preliminary check ensures reliability by detecting installation errors or ground inclination, and the check is performed quickly using existing sensor data without requiring additional time-consuming measurements.
Data Source
AI summary
The embodiments of the present disclosure relate to a steering control device, and a steering assist device and method. The steering control device may control an input-side steering motor included in a input-side steering actuator to assist an input-side mechanism connected to a steering wheel, and control an output-side steering motor included in a output-side steering actuator to assist an output-side mechanism mechanically separated from the input-side mechanism and connected to a wheel.