Control method of transmission gear and motor torque of electric vehicle

A technology for motor torque and electric vehicles, which is applied to the layout of electric vehicles, power plant control mechanisms, and control of driving, etc., can solve problems such as not being well solved, and achieve the effect of reducing power loss.

Inactive Publication Date: 2011-12-14
杨伟斌
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After consulting the literature, the patent (application number: CN201010152337.6) has realized the optimal control of the gear position and torque distribution of hybrid electric vehicles, but the transmission gear and motor torque control of electric vehicles have not yet been well controlled solve

Method used

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  • Control method of transmission gear and motor torque of electric vehicle
  • Control method of transmission gear and motor torque of electric vehicle
  • Control method of transmission gear and motor torque of electric vehicle

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Embodiment Construction

[0042] According to the control process of a PHEV vehicle, the implementation of the control method is described;

[0043] Please refer to the accompanying drawings for a further description of the present invention;

[0044] The total mass of the vehicle m = 1800kg, the air resistance coefficient C D =0.34, windward area A=2.4m 2 , wheel rolling radius r=0.299m, transmission efficiency η T = 0.9, rolling resistance coefficient f = 0.015; the maximum power of the motor is 60kW, the rated speed and the maximum speed are 2500 and 5500r / min respectively; the battery is well matched to meet the power demand of the vehicle; the speed ratio of 1st to 5th gear They are 3.73, 1.96, 1.32, 0.95 and 0.76 respectively, and the final reduction ratio is 4.19.

[0045] The specific steps are:

[0046] 1) According to the accelerator pedal opening and the rate of change of the accelerator pedal opening, the driver's acceleration (deceleration) intention is obtained by formulating the vari...

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Abstract

A method for controlling the transmission gear and motor torque of an electric vehicle. The method utilizes fuzzy control theory to identify the driver's expected acceleration (deceleration) speed during acceleration and coasting according to the opening of the accelerator pedal, the rate of change of the opening of the accelerator pedal, the current gear and the change of the vehicle speed. According to the empirical formula, the required power at the output end of the motor is calculated. Based on the efficiency graph of the motor, the current gear and the required power, the target gear of the transmission and the output torque of the motor are determined with the goal of maximizing the working efficiency of the motor under the premise of meeting the vehicle power demand. Under the premise of ensuring the power demand of the vehicle, the method can make the motor work in the theoretical highest efficiency zone and reduce the electric energy loss of the whole vehicle.

Description

technical field [0001] The invention relates to a control method of a pure electric vehicle, in particular to a control method of a transmission gear and a motor torque during acceleration and coasting of the electric vehicle. Background technique [0002] Pure electric vehicles have the advantages of zero emission, fast acceleration and low noise, and have been identified as the main application direction of new energy vehicles. According to different application goals, electric vehicle power systems can be divided into various structural forms, the most commonly used ones include motor plus single-stage transmission structure, motor plus two-speed transmission structure and motor plus multi-speed (greater than or equal to three-speed) transmission structure. Compared with the other two structural forms, during the acceleration process of the vehicle, the structure of the motor plus multi-speed transmission enables the vehicle to have the maximum acceleration through gear c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L15/20B60K26/02
CPCY02T10/72
Inventor 杨伟斌
Owner 杨伟斌
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