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Torque on-line calibration allocation control method for four-wheel drive electric automobile

An electric vehicle and torque distribution technology, applied in electric vehicles, control drives, control devices, etc., can solve the problem that the energy efficiency of the four-wheel drive system control method needs to be improved.

Active Publication Date: 2017-02-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the energy efficiency of the existing four-wheel drive system control method still needs to be improved, the present invention

Method used

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  • Torque on-line calibration allocation control method for four-wheel drive electric automobile
  • Torque on-line calibration allocation control method for four-wheel drive electric automobile
  • Torque on-line calibration allocation control method for four-wheel drive electric automobile

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Experimental program
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Effect test

specific Embodiment approach 1

[0055] Specific implementation mode one: combine figure 1 and figure 2 To describe this embodiment,

[0056] A four-wheel drive electric vehicle torque online calibration distribution control method is realized based on a distributed drive electric vehicle power system with three drive motors. The power system includes a power battery 1, three drive motors, Controller unit 5 and signal detection and conditioning unit 6;

[0057] The three drive motors include a rear axle drive motor 2 and two front wheel drive motors, the two front wheel drive motors are the left front wheel drive motor 3 and the right front wheel drive motor 4; Shaft connection, the left front wheel drive motor 3 is the same model as the right front wheel drive motor 4, and the left front wheel drive motor 3 is installed on the wheel hub or the wheel edge of the left front wheel of the electric vehicle (the left front wheel drive motor 3 is the wheel hub or the wheel edge motor), the right front wheel dri...

specific Embodiment approach 2

[0069] Specific implementation mode two: combination image 3 To describe this embodiment,

[0070] Step 5 of this embodiment uses the search method to search for the torque optimal distribution coefficient k corresponding to the total torque Tt of the three driving motors of the electric vehicle and the real-time speed of the electric vehicle and distributes the target total torque Tt to the two front The process for wheel drive motors and rear axle drive motors involves the following steps:

[0071] Step 5.1, calculate the real-time total torque Tt(i') of the three driving motors of the distributed drive electric vehicle at time i' according to the real-time speed signal of the electric vehicle and the analog signal of the accelerator pedal opening;

[0072] Step 5.2, set the torque optimization distribution coefficient k, k is the ratio of the front wheel torque to the real-time total torque Tt(i′) of the three drive motors, the search interval [a, b] of k, the search interv...

specific Embodiment approach 3

[0084] Step 5.5 of this embodiment calculates the real-time total efficiency value η1=η(k1) when the torque distribution coefficient k=k1 and the real-time total efficiency value when the torque distribution coefficient k=k2 according to the input power and output power of the three drive motors The process of η2=η(k2) comprises the following steps:

[0085] Calculate and obtain the real-time input and output power of the rear axle drive motor by formula (1),

[0086]

[0087] Among them, P in,1 (i′) is the real-time input power of rear axle drive motor at time i′, P out,1 (i′) is the real-time output power of the rear axle drive motor at time i′; U 1 (i′) is the bus voltage at the input end of the rear axle drive motor at time i′, I 1 (i′) is the bus current at the input end of the rear axle drive motor at time i′; n 1 (i') is the rotational speed of the rear axle drive motor;

[0088] Calculate and obtain the real-time input and output power of the left front wheel d...

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Abstract

The invention discloses a torque on-line calibration allocation control method for a four-wheel drive electric automobile and relates to an electric automobile control method. The method aims at solving the problem that energy efficiency of existing four-wheel drive system control methods still needs to be improved. The method comprises the steps that the operation condition of the automobile is detected in real time through a signal detection and conditioning unit, and the total torque Tt, generated in the operation process, of three driving motors of the electric automobile is calculated; when the SOC of a power battery is greater than or equal to the allowable operation lower limit of the electric automobile, whether values of four nodes of a matrix grid Q<i, j> in an output total torque optimum allocation coefficient matrix of front wheels and a rear shaft are null or not is judged; if the value of any node is null, a search method is adopted for searching for the torque optimization allocation coefficient k; otherwise, the mean value k of the values of the four nodes of the matrix grid Q<i, j> is calculated, and k is treated as the corresponding torque optimization allocation coefficient; and then, Tt is allocated to the two front wheel driving motors and the shaft driving motor according to k. The torque on-line calibration allocation control method is applicable to the field of automobile design and manufacturing.

Description

technical field [0001] The invention relates to a control method for an electric vehicle. Background technique [0002] Batteries currently used in pure electric vehicles are heavy and expensive. Moreover, the mileage that cannot be regarded as a problem at all for fuel vehicles has become one of the biggest obstacles affecting users' purchases for pure electric vehicles. [0003] As a result, car companies began to consider whether to reduce the number of batteries in the design, thereby reducing the cost of car manufacturing while meeting consumers' needs for driving range. Thus, the extended-range electric vehicle came out. Use a relatively light and cheap range extender to solve users' "range anxiety" for pure electric vehicles, and can greatly reduce the number of batteries. [0004] At present, the common cars have front-wheel drive, rear-wheel drive and four-wheel drive systems. Compared with the front-wheel drive and rear-wheel drive systems, the four-wheel drive ...

Claims

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Application Information

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IPC IPC(8): B60L15/20B60K1/02
CPCB60K1/02B60L15/20B60L2220/44B60L2220/46B60L2240/423B60L2260/28Y02T10/72
Inventor 杜玖玉欧阳明高高明明李建秋马良峰卢兰光
Owner TSINGHUA UNIV
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