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Torque correction coefficient calculation and torque analysis methods and systems for electric automobile

A correction coefficient, electric vehicle technology, applied in the direction of electric vehicles, control drive, electric energy management, etc., can solve the problems of low safety factor, inaccurate motor output torque, and no consideration of the state of the whole vehicle system, so as to improve accuracy and system requirements The torque and the actual output torque of the motor are accurate and the effect of improving the torque control accuracy

Inactive Publication Date: 2015-08-26
BEIJING BORGWARD AUTOMOBILE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For this reason, the technical problem to be solved by the present invention is that the method for analyzing the required torque of the electric vehicle system in the prior art only considers the influence of the motor speed and the opening degree of the accelerator pedal, and does not consider the state of the whole vehicle system. The actual output torque of the motor is inaccurate and the safety factor is low, so a method and system for calculating the torque correction coefficient and torque analysis of electric vehicles that comprehensively consider the state of the vehicle system are proposed

Method used

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  • Torque correction coefficient calculation and torque analysis methods and systems for electric automobile
  • Torque correction coefficient calculation and torque analysis methods and systems for electric automobile
  • Torque correction coefficient calculation and torque analysis methods and systems for electric automobile

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Embodiment 1

[0040] This embodiment provides a method for calculating the torque correction coefficient of an electric vehicle, such as figure 2 shown, including the following steps:

[0041] S1: Obtain system state parameters, the system state parameters include motor speed, accelerator pedal opening, vehicle speed and system fault level.

[0042] S2: Determine a correction level and a correction starting point according to the vehicle speed and the system fault level.

[0043] S3: Determine a torque correction coefficient according to the correction level and the motor speed.

[0044] Wherein, the system state parameter mentioned in step S1 refers to the whole vehicle system state parameter of the electric vehicle. In addition to motor speed, accelerator pedal opening, vehicle speed and system failure level, it can also include braking energy recovery status, ABS working status, etc. In this embodiment, the correction coefficient for torque analysis can be obtained according to the a...

Embodiment 2

[0057] This embodiment provides a torque analysis method for electric vehicles, such as image 3 shown, including the following steps:

[0058] W1: According to the calculation method of the torque correction coefficient of the electric vehicle described in Embodiment 1, the torque correction coefficient of the electric vehicle is obtained;

[0059] W2: A corrected torque resolution coefficient is obtained according to the torque correction coefficient and the torque resolution coefficient.

[0060] In step W2, there are many ways to obtain the corrected torque analysis coefficient according to the torque correction coefficient and the torque analysis coefficient, and the correction methods adopted may be different according to different situations of electric vehicles. After the corrected torque analysis coefficient is obtained, the result can be verified. During the verification process, the calculation method is adjusted, and finally the corrected method suitable for the a...

Embodiment 3

[0065] This embodiment provides a torque correction coefficient calculation system for an electric vehicle, such as Figure 5 As shown, it includes a parameter acquisition module, a first correction module, and a second correction module. Wherein, the parameter obtaining module is used to obtain system state parameters, and the system state parameters include motor speed, accelerator pedal opening, vehicle speed and system fault level. The first correction module determines the correction level and correction starting point according to the vehicle speed and fault system level acquired by the parameter acquisition module. The second correction module determines a torque correction coefficient according to the correction level and the motor speed acquired by the first correction module.

[0066] Wherein, the system state parameters acquired by the parameter acquisition module refer to vehicle system state parameters of the electric vehicle. In this embodiment, the accurate to...

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Abstract

The invention provides torque corrosion coefficient calculation and torque analysis methods and systems for an electric automobile. Besides consideration of motor speeds and opening degrees of an accelerator pedal, speeds of the automobile and fault levels are comprehensively considered to determine correction coefficients and correction starting points of torque, and required torque for system analysis is corrected in real time. When the speeds of the automobile and the fault levels are different and the opening degrees of the accelerator pedal are the same, different torque corrosion coefficients can be obtained, and more accurate toque analysis coefficients are obtained; with the adoption of the scheme, more accurate and more comprehensive consideration factors are provided for actual output torque of a motor, and the torque control precision of the whole automobile is improved.

Description

technical field [0001] The invention relates to the technical field of electric vehicle control, in particular to a method and system for calculating a torque correction coefficient and torque analysis of an electric vehicle. Background technique [0002] Under the social background of energy conservation and environmental protection, a consensus has been formed on the development and launch of energy-saving and environmentally-friendly new energy vehicles. Electric vehicles are listed as an important development direction by domestic and foreign automobile companies because of their remarkable energy-saving and emission-reduction effects. Therefore, It is of great significance to the development and research of its key technologies. An electric vehicle is a new energy vehicle directly driven by a motor with the vehicle-mounted high-voltage battery as the single power source. As the driving device of the electric vehicle, the output torque of the motor determines the driving...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L15/20
CPCY02T10/72
Inventor 马啸
Owner BEIJING BORGWARD AUTOMOBILE CO LTD
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