Steering Control Device Noise Filtering for Adaptive Feedback
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Solution Overview
Problem
Existing electric power steering systems fail to provide appropriate feedback of road surface conditions to drivers, leading to inadequate driving stability, convenience, and natural steering feeling, especially when drivers prefer to feel road vibrations or noise.
Innovation Solution
A steering control device that filters noise from the road surface and calculates reactive torque based on noise frequency, using a noise frequency calculator, noise frequency filter, and reactive torque calculator, with filtering degrees adjusted according to different driving modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the EPS system removes all noise from road surface, then driving comfort is improved, but the driver cannot feel the road condition naturally
Solution Approach 1:
The patent applies dynamics by making the noise filtering degree adjustable rather than fixed. The ECU dynamically changes the filtering degree based on detected driving conditions (vehicle speed, steering angle, steering torque) and selected driving modes (comfort, normal, sport). This allows the system to adapt between removing noise for comfort and preserving noise for natural road feel, resolving the contradiction between these opposing requirements.
Solution Approach 2:
The patent changes the parameter of noise filtering degree based on different driving modes and conditions. In comfort mode, a higher filtering degree is applied to remove more noise. In sport mode, a lower filtering degree is applied to preserve more road noise for natural feedback. This parameter adjustment resolves the contradiction by allowing the system to optimize for either comfort or natural road feel depending on driver preference and driving conditions.
2Stability of the object's composition
If the EPS system provides heavy steering feeling, then driving stability is improved, but steering convenience deteriorates
Solution Approach 1:
The patent applies dynamics by making the steering assistance force adjustable based on driving conditions. The ECU dynamically modifies the reactive torque calculation based on vehicle speed, steering angle, and selected driving mode. At high speeds, the system provides heavier steering feel for stability. At low speeds, it provides lighter steering feel for convenience. This dynamic adjustment resolves the contradiction between stability and ease of operation.
Solution Approach 2:
The patent changes the steering assistance parameter (reactive torque) based on driving mode and conditions. The system adjusts the magnitude and characteristics of the force applied to the steering wheel to provide heavy steering feel when stability is prioritized and light steering feel when ease of operation is prioritized, resolving the contradiction between these two requirements.
3Ease of operation
If the EPS system provides light steering feeling, then steering convenience is improved, but driving stability deteriorates
Solution Approach 1:
The patent applies dynamics by making the steering assistance force adjustable based on driving conditions. The ECU dynamically modifies the reactive torque calculation based on vehicle speed, steering angle, and selected driving mode. At low speeds, the system provides lighter steering feel for convenience. At high speeds, it provides heavier steering feel for stability. This dynamic adjustment resolves the contradiction between convenience and stability.
Solution Approach 2:
The patent changes the steering assistance parameter (reactive torque) based on driving mode and conditions. The system adjusts the magnitude and characteristics of the force applied to the steering wheel to provide light steering feel when convenience is prioritized and heavy steering feel when stability is prioritized, resolving the contradiction between these two requirements.
Data Source
AI summary
Disclosed are a steering control device, a steering control method, and a steering support system including same. Particularly, the steering control device according to the present disclosure comprises: a noise frequency calculation unit for calculating the noise frequency of noise transmitted to a wheel; a noise frequency filtering unit for determining filtering degree on the basis of two or more driving modes, and filtering the noise frequency according to the filtering degree; and a reactive torque calculation unit for calculating reactive torque on the basis of the filtered noise frequency.