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Torque distribution control method for four-wheel drive electric automobile

An electric vehicle and torque distribution technology, which is applied in the direction of electric vehicles, control drives, control devices, etc., can solve the problems that the energy efficiency of the control method of the four-wheel drive system needs to be improved, etc., and achieve both driving stability, simple structure, and easy maintenance. Effect

Inactive 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 distribution control method for four-wheel drive electric automobile
  • Torque distribution control method for four-wheel drive electric automobile
  • Torque distribution control method for four-wheel drive electric automobile

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0051] Specific implementation mode one: combine figure 1 and figure 2 To describe this embodiment,

[0052] A four-wheel drive electric vehicle torque distribution control method is realized based on a distributed drive electric vehicle power system with three drive motors, and the power system includes a power battery 1, three drive motors, and a controller unit 5 and signal detection and conditioning unit 6;

[0053] 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 drive motor ...

specific Embodiment approach 2

[0061] Specific implementation mode two: combination image 3 To describe this embodiment,

[0062] In Step 3 of this embodiment, the search algorithm is used to calculate in real time the optimal distribution coefficient of the front wheel and rear axle torque when the total efficiency of the three drive motors of the electric vehicle is optimal, and distribute the real-time total torque of the three drive motors to the two front wheels The process of driving the motor and the rear axle drive motor involves the following steps:

[0063] Step 3.1, calculate the real-time total torque Tt(i′) of the three driving motors of the distributed drive electric vehicle according to the real-time speed signal of the electric vehicle and the analog signal of the accelerator pedal opening;

[0064] Step 3.2, set the torque optimization distribution coefficient k, k is the ratio of the required torque of the two front wheels to the real-time total torque Tt(i′) of the three drive motors, t...

specific Embodiment approach 3

[0076] Step 3.5 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:

[0077] Calculate and obtain the real-time input and output power of the rear axle drive motor by formula (1),

[0078]

[0079] 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;

[0080] 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 distribution 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 firstly, the operation condition of the automobile is detected in real time through a signal detection and conditioning unit and sent to a controller unit; when the SOC of a power battery is smaller than the allowed operation lower limit of the electric automobile, the controller unit sends a stop command, and operation of the electric automobile stops; or otherwise, the real-time total torque of three driving motors in the electric automobile operating process is calculated, a search algorithm is adopted for real-time calculating of the optimum distribution coefficient of torque of front wheels and a rear shaft generated when total efficiency of the three driving motors of the electric automobile is the optimum, the real-time total torque of the three driving motors is allocated to the two front wheels and the rear shaft, and the torque of the front wheels is equally allocated to the left front wheel driving motor and the right front wheel driving motor. The torque distribution 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卢兰光
Owner TSINGHUA UNIV
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