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

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...

AI Technical Summary

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 expensive purchase and maintenance of experimental equipment, while yaw moment of inertia and tire cornering stiffness are The basic parameters of the vehicle dynamics model are the basis for model simulation prediction

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