Electric Power Steering Notch Filter Tuning for Faster NVH Optimization
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Solution Overview
Problem
Optimizing the parameter of a notch filter for an electric power steering apparatus is time-consuming and requires substantial effort due to varying noise and vibration characteristics across different vehicle models.
Innovation Solution
An apparatus and method that utilize a processor connected to a communication interface to receive torque signals from a torque sensor, detect the optimal notch depth of a notch filter using algorithms like steepest gradient descent, and apply this optimal value to minimize mean squared error between the torque signal and a target torque signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a variable notch filter is used to reduce noise and vibration in electric power steering apparatus, then NVH performance is improved, but parameter optimization becomes time-consuming and complex due to varying characteristics across different vehicle models
Solution Approach 1:
The patent applies parameter changes by using an objective function that quantifies the relationship between notch filter parameters (notch depth, notch width, center frequency) and NVH performance. The processor iteratively adjusts these parameters to minimize the objective function value, transforming the complex optimization problem into a systematic parameter search that can be efficiently solved through computational methods.
Solution Approach 2:
The patent replaces manual trial-and-error optimization methods with an automated computational system. The processor executes algorithms to automatically determine optimal notch filter parameters based on torque sensor signals, substituting the mechanical/manual optimization process with an electronic computation system that significantly reduces optimization time and effort.
2Adaptability or versatility
If manual optimization methods are used for notch filter parameters, then adaptability to different vehicle models is achieved, but the complexity and effort required for optimization increases substantially
Solution Approach 1:
The patent creates a universal optimization system that can handle different vehicle models through a standardized process. The objective function and optimization algorithm are designed to be model-agnostic, accepting torque sensor signals from any vehicle model and automatically determining appropriate notch filter parameters, thus providing multi-functionality across different applications without requiring model-specific optimization procedures.
Solution Approach 2:
The system implements self-service by enabling the processor to automatically determine optimal notch filter parameters without requiring manual intervention or expert knowledge. The optimization process autonomously analyzes torque sensor signals, evaluates the objective function, and adjusts parameters to achieve optimal NVH performance, making the system self-sufficient and reducing the complexity of the optimization process.
Data Source
AI summary
Proposed are an apparatus for and a method of optimizing a parameter of a notch filter for use in an electric power steering apparatus to eliminate noise and vibration occurring in the electric power steering apparatus. The apparatus includes: a communication interface, and a processor operatively connected to the communication interface, wherein the processor receives through the communication interface a torque signal from a torque sensor detecting column torque resulting from rotation of a steering wheel, detects an optimal value for a notch depth of the notch filter that minimizes a function value of an objective function that is defined as a mean squared error between the torque signal and a preset target torque signal of the notch filter, and applies the optimal value to the notch filter.