Recognition method for rotational inertia around z axis and tire cornering stiffness of automobile

A technology of moment of inertia and cornering stiffness, applied in vehicle components, transportation and packaging, driver input parameters, etc., can solve problems such as expensive purchase and maintenance costs

Inactive Publication Date: 2015-05-06
CHANGAN UNIV
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Problems solved by technology

[0004] At present, the vehicle yaw moment of inertia and tire cornering stiffness are mainly obtained by measuring physical instruments, such as tire test benches and moment of inertia measurement devices, which lead to

Method used

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  • Recognition method for rotational inertia around z axis and tire cornering stiffness of automobile
  • Recognition method for rotational inertia around z axis and tire cornering stiffness of automobile
  • Recognition method for rotational inertia around z axis and tire cornering stiffness of automobile

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Embodiment

[0070] In this example, the theoretical feasibility of the proposed method is verified by a simulation example. A two-degree-of-freedom vehicle model is established in the simlink environment. The vehicle speed is 100km / h, and the total transmission ratio of the steering system is 16. The vehicle model parameters used are shown in Table 1, and the steering wheel angle pulse input experiment was carried out according to the GB6323 handling stability test standard. Angular pulse experimental data such as image 3 As shown in the figure, a) is the turning angle of the steering wheel; b) is the yaw rate; c) is the lateral acceleration; speed: 100km / h.

[0071]

[0072] Table 1

[0073] The initial value of the optimization variable is estimated according to experience: I Z =2480,K r =59000, K f =55500; boundary constraints are: 2400Z r f z =2510, K r =60010,K f =54800. Figure 4 The frequency response characteristics obtained from the fitting results, the frequency respo...

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Abstract

The invention belongs to the technical field of vehicle parameter measurement, and particularly relates to a recognition method for rotational inertia around z axis and tire cornering stiffness of an automobile. The method comprises the following steps: (1) operating steering wheel angle impulse test according to an automobile operation stability testing method to acquire data, wherein the data comprises a steering wheel angle, yaw velocity, lateral acceleration and a vehicle speed signal; (2) recognizing a transfer function of a vehicle system equivalent two-degree-of-freedom vehicle model through a least square method by using the data acquired by the step (1); (3) recognizing the yaw rotational inertia around the z axis and the tire cornering stiffness of the automobile included in the transfer function obtained by the step (2) through a nonlinear least square method. According to the method, the use of other large-sized experimental instruments is avoided, and the research cost is effectively reduced; the data used by the method is convenient to measure so as to finally facilitate modeling; the speed is high, quick development of research work is facilitated, and the method has higher practicability.

Description

technical field [0001] The invention belongs to the technical field of vehicle parameter measurement, and in particular relates to a method for identifying the moment of inertia of an automobile around a z-axis and the cornering stiffness of a tire. Background technique [0002] Vehicle parameter identification is a necessary prerequisite and technical difficulty in the forward and reverse development of automobiles and controller design. Automobile simulation analysis technology has been recognized as the core technology to shorten the automobile development cycle and reduce the cost of automobile design. Provide strong technical support. The vehicle dynamics model is one of the important tools for simulation analysis, and it is the tool and theoretical basis for performance evaluation and predictive analysis. However, the prerequisite for model application is to have the necessary model parameters. Secondly, the identification of vehicle parameters is also of great sign...

Claims

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Application Information

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IPC IPC(8): B60W40/10G06F17/50
CPCB60W40/10B60W40/12B60W2520/10B60W2520/12B60W2520/125B60W2540/18G06F30/00
Inventor 白艳崔建明管欣付锐许渝峰
Owner CHANGAN UNIV
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