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Motor torque zero-crossing control method for electric automobile

A motor torque, electric vehicle technology, applied in the direction of electric vehicles, control drive, electric energy management, etc., can solve the problems that affect the ride comfort of the whole vehicle and do not consider the speed fluctuation, so as to improve the ride comfort of the whole vehicle and reduce the instantaneous speed fluctuation Effect

Active Publication Date: 2017-09-01
IAT AUTOMOBILE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing technology, such as figure 1 As shown, when the motor torque crosses zero, the original torque change slope is still maintained. Since the speed fluctuation caused by the instantaneous change of the torque direction when the motor torque crosses zero is not considered, the speed fluctuation may affect the ride comfort of the vehicle, especially the motor Passenger cars with direct drive are more obvious

Method used

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  • Motor torque zero-crossing control method for electric automobile
  • Motor torque zero-crossing control method for electric automobile

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Embodiment 1

[0015] In this embodiment, the zero-crossing maintenance control strategy is adopted for the motor torque, so that the instantaneous speed fluctuation when the positive and negative torque of the motor is switched can be effectively reduced, the ride comfort of the vehicle can be improved, and the wear of the motor can be reduced. Specifically, as figure 2 As shown, when the demanded motor torque transitions from positive torque to negative torque, it first changes according to the descending slope of the original demanded torque, and when it reaches the upper limit X of the torque zero-crossing interval (as shown in point A), the zero-crossing control demand torque maintains the original demanded torque The descending slope drops to zero torque, and then keeps the zero torque of the motor unchanged until the original demand torque is lower than the zero-crossing interval torque lower limit -X (as shown in point B), the zero-crossing control demand torque catches up to the sam...

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Abstract

The invention relates to a motor torque zero-crossing control method for an electric automobile and belongs to the technical field of electric automobiles. According to the motor torque zero-crossing control method for the electric automobile, a zero-crossing keeping control strategy is conducted on motor torque through a preset demand torque zero-crossing interval [X, -X], instant rotating speed fluctuation at the time of switching of positive torque and negative torque of a motor can be effectively weakened, automobile smoothness is improved, and reducing of motor abrasion is facilitated.

Description

technical field [0001] The present invention relates to the technical field of electric vehicles, and more specifically, the present invention relates to a zero-crossing control method of electric vehicle motor torque. Background technique [0002] Due to the shortage of oil and gas resources and the increasingly prominent environmental pollution problems, electric vehicles, as a new generation of clean energy vehicles, have received more and more attention from the state. With the continuous innovation of electric vehicle technology and the increase of national support, the proportion of electric vehicles in my country has been rising in recent years. With the increasing popularity of electric vehicles, their safety and comfort have also attracted more and more attention. In the existing technology, such as figure 1 As shown, when the motor torque crosses zero, the original torque change slope is still maintained. Since the speed fluctuation caused by the instantaneous ch...

Claims

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Application Information

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IPC IPC(8): B60L15/20
CPCB60L15/20Y02T10/72
Inventor 王守军刘吉顺张迪郭建磊
Owner IAT AUTOMOBILE TECH
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