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Energy efficiency hierarchical coordination optimization control method for four-wheel drive extended-range electric vehicle

A technology of electric vehicles and four-wheel drive, which is applied in electric vehicles, engine-driven traction, battery/fuel cell control devices, etc., and can solve problems such as not having optimal drive efficiency

Inactive Publication Date: 2017-01-25
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem that the existing range-extended electric vehicles do not optimize the driving efficiency under complex operating conditions

Method used

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  • Energy efficiency hierarchical coordination optimization control method for four-wheel drive extended-range electric vehicle
  • Energy efficiency hierarchical coordination optimization control method for four-wheel drive extended-range electric vehicle
  • Energy efficiency hierarchical coordination optimization control method for four-wheel drive extended-range electric vehicle

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Experimental program
Comparison scheme
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specific Embodiment approach 1

[0059] Specific implementation mode one: combine figure 1 with figure 2 To describe this embodiment,

[0060] A four-wheel-drive extended-range electric vehicle power system, including a range extender 1, a rectifier 4, a power battery 5, a charger 6, an inverter system 7, a first transmission 8, a first drive motor 9, and a second drive Motor 10, second transmission 11 and TCU12;

[0061] The range extender 1 includes an engine 2 and a generator 3; the output end of the engine 2 is mechanically connected to the input end of the generator 3; the output end of the generator 3 is electrically connected to the input end of the rectifier 4; the output end of the charger 6 is connected to the power battery 5 Input terminal electrical connection;

[0062] The output end of the rectifier 4 and the output end of the power battery 5 are electrically connected to the input end of the inverter system 7,

[0063] The output terminal of the rectifier 4 and the output terminal of the p...

specific Embodiment approach 2

[0074] Specific implementation mode two: combination image 3 To describe this embodiment,

[0075] The determination of the vehicle operation mode and the working state of the range extender 1 described in step 1 of this embodiment includes the following steps:

[0076] Step 1.1: Detect the parameters of the vehicle's driving conditions and the SOC of the power battery;

[0077] Step 1.2: Determine whether the SOC of the power battery is greater than the upper limit value of the range extender SOC_high (also the lower limit value of the pure electric working mode), if so, perform step 1.3, otherwise perform step 1.4;

[0078] Step 1.3: Determine whether the driver has input the command to start the range extender, if so, execute step 1.4, otherwise execute step 1.5;

[0079] Step 1.4: Determine whether the range extender is activated, if so, perform step 1.6, otherwise continue to control the range extender to start;

[0080] Step 1.5: The car runs in pure electric working...

specific Embodiment approach 3

[0083] Specific implementation mode three: combination Figure 4 To describe this embodiment,

[0084] Step 5 of this embodiment uses the search method to search for the target total torque Tt of the two drive motors of the electric vehicle and the torque optimal distribution coefficient k corresponding to the real-time speed of the electric vehicle and distributes the target total torque Tt to the first The process of driving the motor and the second driving motor includes the following steps:

[0085] Step 5.1. Obtain the target total torque Tt(i′) of the two driving motors of the electric vehicle at time i′

[0086] Step 5.2, set the torque optimization distribution coefficient k, k is the ratio of the output torque of the first drive motor to the total output torque Tt(i') of the drive motor at time i', the search interval [a, b] of k, search The initial search interval of the interval [a, b] is [0, 1]; set the search ratio x, x<1; the search convergence accuracy is ε; ...

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Abstract

The invention discloses an energy efficiency hierarchical coordination optimization control method for a four-wheel drive extended-range electric vehicle, relates to a control method for an electric vehicle, and aims to solve the problem that the drive efficiency of an existing extended-range electric vehicle is not optimal under a complex running condition. The method comprises the following steps: calculating the total target torque Tt of two drive motors of the electric vehicle; judging whether numerical values of four nodes of a matrix grid Qi,j are empty or not, and if the numerical value of any node is empty, searching for a torque optimization allocation coefficient k by adopting a searching method, allocating the total torque Tt to the first drive motor and the second drive motor according to k, and controlling the drive motor to output target torque; otherwise calculating an average value k of the numerical values of the 4 nodes of the matrix grid Qij, adopting k as the corresponding torque optimization allocation coefficient, allocating the total torque Tt to the first drive motor and the second drive motor according to k, and controlling the drive motor to output the target torque. The method is applied to the field of vehicle designing and manufacturing.

Description

technical field [0001] The invention relates to a control method for an electric vehicle. Background technique [0002] As we all know, the batteries that are currently equipped with 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] Since there are two energy sources of the range extender and the power battery in the range-extended electric vehicle, how to reasonably allocate the r...

Claims

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Application Information

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IPC IPC(8): B60L3/00B60L11/12B60L11/18B60L15/20B60L15/32B60L50/15
CPCB60L3/00B60L15/20B60L15/32B60L50/61B60L58/12B60L2220/42B60L2240/12B60L2240/423B60L2240/54Y02T10/62Y02T10/70Y02T10/72
Inventor 杜玖玉欧阳明高高明明李建秋王佳
Owner TSINGHUA UNIV
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