A nonlinear analysis method for electric vehicle steering stability

A nonlinear analysis and electric vehicle technology, applied in the field of vehicle steering stability analysis, can solve problems such as difficult steering behavior and stable areas, long analysis period, uncertain steering behavior, etc., achieve an intuitive and accurate balance state, shorten the analysis period, Effects of Improving Analytical Efficiency

Inactive Publication Date: 2017-12-29
BEIJING UNIV OF TECH
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Problems solved by technology

[0002] Under the extreme conditions of high speed and large steering, with the rapid increase of lateral acceleration, the tires enter the strong nonlinear region, the linear relationship between steering force and slip angle no longer satisfies, and the tire force is saturated. The steering behavior cannot be determined, and it is difficult to accurately estimate its steering behavior and stable region by using traditional linear analysis methods. At this time, the steering characteristics of electric vehicles need to be studied from the perspective of nonlinear dynamics
[0003] The traditional nonlinear analysis methods for steering stability of electric vehicles are mostly limited to the two-degree-of-freedom steering model, which cannot fully reflect the high-order and complex steering process of the car. However, the Lyapunov stability analysis method for high-order nonlinear systems, The process of constructing its Lyapunov function is extremely complicated, and the analysis period is long

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  • A nonlinear analysis method for electric vehicle steering stability
  • A nonlinear analysis method for electric vehicle steering stability
  • A nonlinear analysis method for electric vehicle steering stability

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[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0021] figure 1 Realize the flow chart for the nonlinear analysis method of electric vehicle steering stability, determine the analysis object, and establish figure 2 The electric vehicle steering nonlinear dynamic model shown in the figure constructs a nonlinear differential equation, reduces the order of the system by eliminating the fast relaxation parameters in the nonlinear system, and uses the multi-step recursion method to draw the phase trajectory of the system according to the principle of isoclines , to obtain the equilibrium state, stability accuracy and stability of the system during the electric vehicle steering process with different initial conditions.

[0022] 1. Establish nonlinear dynamic model

[0023] Based on the fact that the tire enters the nonlinear region under extreme working conditions, the "magic formula" tire mo...

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Abstract

A nonlinear analysis method for electric vehicle steering stability, by establishing a nonlinear dynamic model that can describe the electric vehicle steering, constructing a nonlinear differential equation, and then using the principle of adiabatic elimination to reduce the constructed electric vehicle steering nonlinear differential equation First-order processing, eliminate the fast relaxation parameters in the system, and obtain the simplified nonlinear differential equation. Finally, according to the principle of isoclines, use the multi-step recursion method to draw the phase trajectory of the electric vehicle steering nonlinear dynamic system. The balance state, stability accuracy and stability are intuitively reflected, and the stability of the electric vehicle steering process under different speeds and corners is analyzed.

Description

technical field [0001] The invention relates to a nonlinear analysis method for the stability of an electric vehicle during steering, and belongs to the technical field of vehicle steering stability analysis. Background technique [0002] Under the extreme conditions of high speed and large steering, with the rapid increase of lateral acceleration, the tires enter the strong nonlinear region, the linear relationship between steering force and slip angle no longer satisfies, and the tire force is saturated. Steering behavior cannot be determined, and it is difficult to accurately estimate its steering behavior and stable region using traditional linear analysis methods. At this time, the steering characteristics of electric vehicles need to be studied from the perspective of nonlinear dynamics. [0003] The traditional nonlinear analysis methods for steering stability of electric vehicles are mostly limited to the two-degree-of-freedom steering model, which cannot fully refle...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 冯能莲陈升鹏米磊张杨宾洋
Owner BEIJING UNIV OF TECH
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