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Traction control method for electric automobile

A technology of traction control and electric vehicles, applied in the direction of electric vehicles, control drive, electric energy management, etc., can solve the problems that traditional algorithms are difficult to meet the requirements, and the vehicle speed is difficult to obtain directly, so as to achieve good acceleration or braking performance, save control costs, The effect of simplifying control complexity

Inactive Publication Date: 2016-06-15
JILIN UNIV
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Problems solved by technology

[0005] 2. Four-wheel drive electric vehicles do not have non-driving wheels, and considering cost issues, it is difficult to obtain accurate vehicle speed directly, which makes it difficult to effectively apply traditional control methods based on slip ratio control in four-wheel drive electric vehicles
This is actually a multi-objective complex optimization control problem with constraints
Ordinary traditional algorithms have been difficult to meet the requirements

Method used

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  • Traction control method for electric automobile
  • Traction control method for electric automobile
  • Traction control method for electric automobile

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Embodiment Construction

[0045] The relevant parameters of the present invention are as shown in table 1:

[0046] Table 1 Relevant parameters of vehicle longitudinal dynamics model

[0047]

[0048] Maximum transmission torque estimation:

[0049] From the longitudinal motion of the vehicle and the rotation equations of the four wheels:

[0050] (1)

[0051] in, represent the front left, front right, rear left, and rear right wheels respectively, and the sum of the longitudinal forces of the four wheels is set as , here the values ​​of the moment of inertia of the four wheels are all set as ;

[0052] According to the formula (1), the longitudinal force of each wheel can be calculated by the following formula:

[0053] (2)

[0054] define a relative factor , which represents the ratio of vehicle acceleration to wheel acceleration, where Represents front left, front right, rear left, rear right four wheels

[0055] (3)

[0056] From the formula (3), we can get, The calculatio...

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Abstract

The invention provides a traction control method for an electric automobile and belongs to the technical field of electric automobiles. The traction control method for the electric automobile aims at estimating the maximum transmission moment of each wheel in a current state through a measurable quantity, and then a traction controller is designed by the adoption of a model prediction control algorithm. By the adoption of the method, firstly, the maximum transmission moments of all the wheels in the current state are estimated in real time according to torque and rotation speed information of the four wheels of the electric automobile; and then the estimated maximum transmission moments of all the wheels are transmitted to the designed traction controller. By the adoption of the method, the dependence on the automobile speed in a traditional method is effectively avoided, the control complexity is greatly lowered, and the control cost is saved; and the compromise optimization between the automobile safety and the whole automobile performance is effectively achieved, and the good accelerating or braking performance is obtained on the premise that the wheels are effectively prevented from slipping in the accelerating process or being locked in the braking process.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles. Background technique [0002] In recent years, with the increasing environmental pollution and energy crisis, energy conservation and emission reduction has become an important goal in China and even in the world. Due to its advantages such as high energy efficiency, low emission, low noise, and energy recovery, electric vehicles have become a major direction for the development of the automotive industry today. The country has also issued a large number of preferential policies to support companies in researching electric vehicles. For example, during the "Tenth Five-Year Plan" period, The National 863 Program "Major Science and Technology Project of Electric Vehicles" has received strong support from the state for two consecutive phases, and the recently proposed "Made in China 2025" strategy. [0003] Electric vehicles driven by in-wheel motors have been a research hotspot in recent...

Claims

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Application Information

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IPC IPC(8): B60L15/20B60W10/08B60W30/18
CPCB60L15/20B60W10/08B60W30/18B60W30/18172Y02T10/60Y02T10/72
Inventor 赵海艳陈虹袁磊
Owner JILIN UNIV
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