Steering Control Apparatus Band Correction Filter
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Solution Overview
Problem
Existing steering control apparatuses face challenges in easily matching transmission characteristics to a driver's senses based on load information, requiring complex high-order filters and phase adjustments.
Innovation Solution
A steering control apparatus with a band correcting unit that adjusts the gain of a specific frequency band using a quadratic bandpass filter, allowing for easy adjustment of transmission characteristics from the steering wheel torque to the steering torque, without the need for phase adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-order filters and phase adjustments are used to match transmission characteristics to driver's senses, then the precision of transmission characteristics matching is improved, but the device complexity increases
Solution Approach 1:
The patent segments the frequency spectrum into multiple frequency bands and processes each band independently using separate gain adjustment mechanisms. This allows precise control of transmission characteristics at different frequencies without requiring complex high-order filters, as each frequency band can be optimized separately with simpler filter structures.
Solution Approach 2:
The patent applies different gain values to different frequency bands based on their specific characteristics and driver sensitivity requirements. By adjusting the gain locally for each frequency band rather than applying a uniform adjustment across all frequencies, the system achieves precise transmission characteristics matching with simpler overall system design.
2Adaptability or versatility
If multiple basic compensation amounts are weighted and added to generate assistance compensation amount, then the adaptability of vehicle characterization is improved, but the ease of operation deteriorates
Solution Approach 1:
The patent dynamically adjusts the gain for each frequency band based on operating conditions such as vehicle speed, steering angle, and road surface conditions. This dynamic adaptation allows the system to achieve versatile vehicle characterization without requiring complex manual design and adaptation processes, as the system automatically optimizes the compensation amounts for different operating scenarios.
Solution Approach 2:
The patent incorporates feedback mechanisms that monitor driver input, vehicle response, and road conditions to automatically adjust the weighted compensation amounts. This feedback-driven approach enables adaptable vehicle characterization while simplifying operation, as the system self-tunes based on real-time conditions rather than requiring manual design adjustments.
3Adaptability or versatility
If the center frequency of bandpass filter does not match the frequency for transmission characteristic change, then the adaptability of frequency adjustment is improved, but the manufacturing precision of frequency matching deteriorates
Solution Approach 1:
The patent divides the frequency spectrum into multiple discrete bands, each with its own center frequency and gain adjustment capability. This segmentation allows the system to independently adjust transmission characteristics at different frequencies without requiring precise matching between filter center frequencies and target frequencies, as each band can be optimized separately.
Solution Approach 2:
The patent employs adjustable gain parameters for each frequency band that can be modified to achieve desired transmission characteristics. By changing the gain parameter rather than relying solely on fixed filter center frequencies, the system achieves both frequency adjustment flexibility and precise frequency matching through parameter optimization.
Data Source
AI summary
A steering control apparatus controls an assistance torque outputted by a motor connected to a steering system mechanism that generates a steering torque. In the steering control apparatus, a load calculating unit estimates or detects a load acting on a steering shaft of the steering system mechanism. A target steering torque calculating unit calculates a target steering torque that is a target value of the steering torque, based on the estimated or detected load. A servo controller calculates a command value of the assistance torque such that a torque deviation that is a difference between the steering torque and the target steering torque is zero. A band correcting unit includes a band correction filter that extracts a component of a specific frequency band during a process of calculation from the load to the target steering torque, and corrects a gain of a predetermined transfer function at the extracted band.