Turning Control System Feedback Vibration Suppression
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Solution Overview
Problem
Existing turning control systems fail to effectively convey road-surface state information to drivers, potentially leading to reduced driver awareness and stability issues during vehicle operation.
Innovation Solution
A turning control system that includes an electronic control unit, which calculates and adjusts the steering operation amount and angle operation amount to reflect road-surface state information, allowing for feedback control and correction to maintain optimal steering torque and angle, thereby informing the driver of road conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If feedback control is applied to control turning angle to target turning angle, then reverse input vibration from turning wheels is suppressed, but driver awareness of road-surface state information is reduced
Solution Approach 1:
The patent applies partial feedback control by selectively suppressing only the reverse input vibration component while preserving the road-surface state information component. The control system calculates the degree of vibration and applies feedback control only when vibration exceeds a threshold, rather than continuously suppressing all feedback. This partial application of feedback control resolves the contradiction by maintaining stability when needed while preserving driver awareness under normal conditions.
Solution Approach 2:
The patent dynamically adjusts the feedback control gain based on the calculated degree of vibration and vehicle speed. The control system continuously monitors vibration levels and modifies the suppression intensity accordingly, transitioning between different control states. This dynamic adjustment allows the system to maintain stability during high-vibration conditions while preserving road-surface information during normal operation, resolving the static contradiction through adaptive behavior.
2Loss of information
If the magnitude of subtracted value is increased to enhance driver awareness of road information, then steering control stability deteriorates
Solution Approach 1:
The patent changes the parameter of feedback control gain based on vibration degree and vehicle speed. By adjusting this parameter dynamically, the system optimizes the balance between preserving road-surface information and maintaining steering stability. The gain parameter is increased to preserve information when vibration is low, and decreased to maintain stability when vibration is high, resolving the contradiction through parameter optimization.
Solution Approach 2:
The patent applies different levels of feedback control to different operating conditions. Instead of uniform suppression, the system applies localized control strategies: minimal suppression during normal operation to preserve road information, and enhanced suppression during high-vibration conditions to maintain stability. This localized quality approach resolves the contradiction by tailoring the control intensity to specific operational contexts.
3Reliability
If feedback control continuously suppresses reverse input vibration, then steering stability is improved, but driver ability to perceive road conditions is reduced
Solution Approach 1:
The patent uses feedback control selectively based on measured vibration levels. The system continuously monitors the degree of reverse input vibration and applies feedback suppression only when necessary, creating a closed-loop control system that adapts to actual conditions. This feedback mechanism resolves the contradiction by maintaining reliability when vibration problems occur while preserving driver perception capability during normal operation.
Solution Approach 2:
The patent calculates the degree of vibration in advance and prepares appropriate control responses before vibration becomes problematic. By predicting vibration trends and pre-adjusting control parameters, the system prevents excessive vibration while minimizing unnecessary suppression of road-surface information. This preliminary anti-action approach resolves the contradiction by addressing reliability issues before they manifest while preserving driver perception.
Data Source
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AI summary
A turning control system (40) includes an electronic control unit. The electronic control unit is configured to perform: a steering operation amount calculating process (M16) of calculating a steering operation amount; an angle command value calculating process of calculating an angle command value; an angle operation amount calculating process (M50) of calculating an angle operation amount; an operation process of operating a drive circuit of an electric motor; an adjustment process of adjusting a magnitude of a value obtained by subtracting the angle operation amount which is reflected in the operation process from the angle operation amount; and a correction process of correcting a magnitude of an input when the angle command value is calculated in the angle command value calculating process to be less when the magnitude of the subtracted value is great than when the magnitude of the subtracted value is small.