Electric automobile and electric current loop control method and device for permanent magnet synchronous motor of electric automobile

Abstract

The invention discloses an electric automobile and an electric current loop control method and device for a permanent magnet synchronous motor of the electric automobile. The method includes the following steps that traveling working condition information of the electric automobile, the d-axis given current and the q-axis given current of the permanent magnet synchronous motor and the d-axis actual current and the q-axis actual current of the permanent magnet synchronous motor are obtained; according to traveling working condition information and a preset neural network algorithm, a d-axis proportionality coefficient, a d-axis integral coefficient, a q-axis proportionality coefficient, a q-axis integral coefficient and the PWM switching frequency are calculated; and the d-axis voltage is calculated according to the d-axis given current, the d-axis actual current, the d-axis proportionality coefficient, the d-axis integral coefficient and a d-axis current PI control algorithm, the q-axis voltage is calculated according to the q-axis given current, the q-axis actual current, the q-axis proportionality coefficient, the q-axis integral coefficient and a q-axis current PI control algorithm, and therefore vector control can be conducted on the permanent magnet synchronous motor according to the d-axis voltage, the q-axis voltage and the PWM switching frequency. Therefore, through setting of control parameters matched with the traveling working condition, the better rapid respond capacity is achieved, and overshooting is reduced.

Description

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AI Technical Summary

Benefits of technology

This patented technology describes how to improve the performance of a magnetically driven machine (M) used in vehicles such as hybrid cars or electric powered trucks. By calculating specific coefficients from these factors, it can quickly respond with high precision while reducing errors caused by external influences like temperature changes or other variables affecting M's operation. Additionally, the use of certain algorithms allows for more precise calculations than previously possible due to their ability to adapt themselves during different drive modes without relying solely upon predetermined values provided by predefined parameters. Overall, this new technology provides improved efficiency and reduced impact on M' s operating environment.

Problems solved by technology

The technical problem addressed in this patented text relates to finding suitable values for controlling electrical devices like power steering systems (EPS) with high efficiency during operation under different operating environments without sacrificing responsiveness and precision.

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