Vehicle Control Device Hysteresis Simulation
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Solution Overview
Problem
Existing vehicle control methods struggle to accurately simulate and suppress coupled vibrations with non-linear characteristics, such as hysteresis, due to their reliance on linear models that cannot effectively capture the dynamic behavior of actual systems.
Innovation Solution
A vehicle control device that includes a dynamic characteristics description unit to simulate hysteresis characteristics and a correction amount computing unit to adjust the manipulated variable, allowing for the definition of a control target index related to hysteresis, thereby facilitating the design of a control system that can effectively suppress vibrations with non-linear characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a linear model is used to describe the dynamic characteristics of the controlled object, then the device complexity is reduced and ease of manufacture is improved, but the measurement precision of hysteresis characteristics deteriorates and the reliability of vibration suppression performance is reduced
Solution Approach 1:
The patent changes the mathematical model from a linear description to a non-linear description that incorporates hysteresis characteristics. This is achieved by introducing non-linear parameters and equations that can accurately represent the complex dynamic behavior of the controlled object, thereby improving measurement precision while accepting increased device complexity.
Solution Approach 2:
The patent introduces an intermediary mathematical model that specifically addresses hysteresis characteristics. This intermediary model acts as a bridge between the simple linear model and the complex actual system behavior, allowing for accurate simulation of non-linear dynamics without requiring complete redesign of the entire control system.
2Ease of operation
If a linear model is used to describe the dynamic characteristics of the controlled object, then the ease of operation is improved, but the reliability of vibration suppression performance deteriorates
Solution Approach 1:
The patent transforms the control approach by changing from linear parameters to non-linear parameters that capture hysteresis effects. This allows the control system to reliably suppress vibrations by accurately representing the actual system behavior, even though the ease of operation is reduced due to the complexity of non-linear control design.
Solution Approach 2:
The patent implements feedback mechanisms that use the non-linear hysteresis model to continuously adjust control actions. This feedback loop ensures reliable vibration suppression by comparing actual system response with model predictions and making real-time corrections, thereby improving reliability while maintaining reasonable ease of operation through systematic control design.
3Device complexity
If a parallel model of general spring and damping elements is used, then the device complexity is reduced, but the measurement precision of non-linear characteristics such as hysteresis deteriorates
Solution Approach 1:
The patent changes the mechanical model from simple spring-damping elements to a more complex non-linear model that incorporates hysteresis parameters. This transformation enables accurate simulation of non-linear characteristics by introducing parameters that specifically represent hysteresis behavior, thereby improving measurement precision while accepting increased model complexity.
Solution Approach 2:
The patent creates a composite mathematical model that combines multiple elements including spring characteristics, damping characteristics, and hysteresis characteristics. This composite model accurately represents the complex mechanical behavior of the controlled object by integrating different physical phenomena into a unified non-linear framework.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device achieves improved vibration suppression effects by simulating and correcting for hysteresis characteristics, enhancing the control system's ability to manage coupled vibrations with non-linear dynamics, leading to better vehicle performance and ride quality.
Implementation Method 1
simulates, using the model element, hysteresis characteristics caused during a process of motion or deformation of the controlled object
Data Source
AI summary
In a vehicle control device, a dynamic characteristics description unit includes a model element simulating dynamic characteristics of motion or deformation of a controlled object. By using the model element, this unit simulates hysteresis characteristics caused during a process of motion or deformation of the controlled object based on at least one of an estimated value of the input manipulated variable and an estimated value of a disturbance input inputted in the controlled object, and defines a control target index of a motion state of the controlled object. A correction amount computing unit calculates a correction amount which adjusts the manipulated variable in such a way that the control target index related to the hysteresis characteristics becomes a desired state. A command output unit corrects manipulated variable based on the correction amount to produce a command for the corrected manipulated variable to output it to the controlled object.