Steering Control Disturbance Compensation via Frequency Comparison
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Solution Overview
Problem
Existing steering control systems struggle to effectively compensate for disturbances caused by multiple factors, as current technologies primarily address individual causes rather than composite disturbances affecting the steering control apparatus of vehicles.
Innovation Solution
A steering control apparatus and method that identifies the cause of disturbances by comparing estimated frequencies based on rack force, steering torque signal, and vehicle wheel rotational speed, then applies a compensation rate to efficiently offset internally or externally caused disturbances, using a disturbance compensation unit to generate a final compensation current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If disturbance compensation is performed using individual cause handling methods, then the compensation for single-factor disturbances is effective, but the compensation for composite disturbances caused by multiple factors is insufficient
Solution Approach 1:
The patent segments the disturbance compensation task by separating internally caused disturbances from externally caused disturbances through frequency comparison. By dividing the disturbance sources into internal (mechanical vibrations, motor vibrations) and external (road surface irregularities, wind) categories, the system can apply different compensation strategies to each type, thereby improving overall compensation effectiveness for composite disturbances
Solution Approach 2:
The patent implements dynamic disturbance compensation by continuously comparing estimated frequencies in real-time and adjusting the compensation rate accordingly. The disturbance cause determination unit dynamically identifies whether disturbances are internal or external by comparing frequencies, and the compensation rate calculation unit dynamically adjusts the compensation amount based on this identification, enabling adaptive handling of varying disturbance conditions
2Measurement precision
If a single disturbance compensation method is applied to all disturbance causes, then the system complexity is low, but the precision of disturbance removal is insufficient
Solution Approach 1:
The patent employs feedback mechanisms where the disturbance cause determination unit continuously monitors and compares estimated frequencies, and based on this feedback, determines whether disturbances are internally or externally caused. This feedback loop enables precise disturbance identification and allows the system to adjust compensation strategies in real-time, improving measurement precision without requiring overly complex hardware modifications
Solution Approach 2:
The patent introduces an intermediary frequency comparison mechanism that acts as a mediator between disturbance detection and compensation execution. By comparing estimated frequencies from different sources (steering torque sensor, vehicle speed sensor) and using this comparison as an intermediary step, the system can accurately identify disturbance causes and apply appropriate compensation without directly complexifying the entire control system
3Ease of operation
If disturbance compensation is applied without distinguishing disturbance causes, then the control process is simple, but the driver comfort and steering accuracy are reduced due to inadequate compensation
Solution Approach 1:
The patent implements dynamic disturbance compensation by continuously comparing estimated frequencies in real-time and adjusting the compensation rate accordingly. The disturbance cause determination unit dynamically identifies whether disturbances are internal or external by comparing frequencies, and the compensation rate calculation unit dynamically adjusts the compensation amount based on this identification, enabling adaptive handling of varying disturbance conditions
Solution Approach 2:
The patent changes the compensation parameter (compensation rate) based on the identified disturbance cause. When internal disturbances are detected, one compensation rate is applied, while when external disturbances are detected, a different compensation rate is applied. This parameter adjustment strategy maintains simple steering operation while effectively reducing driver discomfort through cause-specific compensation
Data Source
AI summary
The present invention relates to a steering control apparatus and a steering control method for removing an inwardly caused disturbance or outwardly caused disturbance with respect to a vehicle. It is possible to efficiently remove a disturbance of a steering control apparatus which is generated due to various causes by: confirming a disturbance cause based on estimated frequencies estimated based on three factors that affect the steering control apparatus (i.e., a first estimated frequency estimated based on the estimation of a rack force, a second estimated frequency estimated based on a steering torque signal, and a third estimated frequency estimated based on a vehicle wheel rotational speed); then determining a compensation rate, which varies depending on whether the disturbance is an internally caused disturbance or an externally caused disturbance; and then applying the compensation rate to a steering current value.