Method for calculating power assist characteristic table of electric power-assisted steering system

Abstract

The invention discloses a method for calculating a power assist characteristic table of an electric power-assisted steering system and belongs to the technical field of automobile power-assisted steering system control. The invention aims to solve the problem of poor driving feeling of an automobile due to the difficult iterative correction and difficult driving style control of EPS basic power assist characteristic table real vehicle field test. The vehicle chassis dynamics inverse characteristic and the steering system dynamics inverse characteristic are both inherent characteristics of thevehicle. According to the method of the invention, an EPS basic power assist characteristic table is decomposed into a driving style module, a vehicle chassis dynamic inverse characteristic module anda steering system dynamic inverse characteristic module; the three modules have clear physical meanings, so that the calibration of the basic power assist table of the EPS has a theoretical basis, the calibration difficulty and workload of the EPS basic power assist table are reduced, and an EPS development period is shortened. By designing the driving style module, the driving style of the automobile can be directly controlled, the driving feeling of the automobile can be adjusted, the requirements for the driving feeling and assistance are both considered, and the quality of the EPS is improved.

Description

technical field [0001] The invention belongs to the technical field of automobile electric power steering system control, relates to an electric power steering system, and in particular relates to the basic boosting characteristics of the electric power steering system. Background technique [0002] In recent years, electric power steering system (EPS) has been widely used in automobiles due to its many advantages. A good power steering system should take into account the requirements of portability, stability and driving style, and give people a good driving experience. EPS basically assists The characteristic table determines the EPS steady-state boosting effect, which has a great influence on the steering performance of the car. At present, the adjustment of the EPS booster characteristic table is usually in the later stage of the development of automobile products, and the driving feeling is indirectly adjusted through the iterative optimization of the actual vehicle fie...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that it is difficult to iteratively correct the EPS basic boost characteristic table in real vehicle field tests and to control the driving style, resulting in a bad driving experience, and proposes a calculation method for EPS basic boost characteristics based on the decoupling of EPS boost characteristics , to solve the problems of difficult calibration of EPS basic booster characteristic table and difficulty in controlling the driving style of the car, shorten the EPS development cycle, and reduce the cost of EPS research and development

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