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A hierarchical coordinated energy efficiency control method for plug-in four-wheel drive hybrid electric vehicles

A technology of hybrid electric vehicle and control method, which is applied to hybrid electric vehicles, motor vehicles, power units, etc., can solve the problem of not having the best energy efficiency of automobiles

Inactive Publication Date: 2019-02-12
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The present invention solves the problem that the control method of the existing hybrid power system does not maximize the energy efficiency of the vehicle

Method used

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  • A hierarchical coordinated energy efficiency control method for plug-in four-wheel drive hybrid electric vehicles
  • A hierarchical coordinated energy efficiency control method for plug-in four-wheel drive hybrid electric vehicles
  • A hierarchical coordinated energy efficiency control method for plug-in four-wheel drive hybrid electric vehicles

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0084] Specific implementation mode one: combine figure 1 with figure 2 To describe this embodiment,

[0085] A plug-in dual-motor four-wheel drive hybrid power system, including engine 1, clutch 2, TCU 5, charger 6, power battery 7, inverter system 8, two drive motors and two transmissions; two drive motors Including: a first drive motor 3 and a second drive motor 9; two transmissions include: a first transmission 4 and a second transmission 10;

[0086] The first drive motor 3 is connected to the first transmission 4 to drive the front axle, and the second drive motor 9 is connected to the second transmission 10 to drive the rear axle;

[0087] The output end of the engine 1 is mechanically connected to the input end of the clutch 2, the output end of the clutch 2 is mechanically connected to the input end of the first transmission 4, the output end of the first drive motor 3 is mechanically connected to the input end of the first transmission 4, and the output end of the...

specific Embodiment approach 2

[0100] Specific implementation mode two: combination image 3 To describe this embodiment,

[0101] The process of switching the driving mode of the power system in real time described in step 1 of the embodiment includes the following steps:

[0102] Step1. Detect the SOC(i') of the power battery 7 at time i', determine whether the SOC(i') is less than the engine start SOC threshold value SOC_low, if so, execute Step2, otherwise execute Step3;

[0103] Step2, control the engine start, the engine continues to work, determine whether the total demand torque Ttotal(i') of the car at the time i' is greater than the upper limit Tmax_ice(i') of the engine's economic consumption area at the current speed, if so, execute Step2A, otherwise execute Step2B;

[0104] Step2A, enter the first HEV three-power hybrid mode, execute Step2A1 to Step2A3:

[0105] Step2A1. When calculating SOC(i'), the two drive motors allow the maximum output torque Temax(i') and the engine output minimum tor...

specific Embodiment approach 3

[0121] Specific implementation mode three: combination Figure 4 To describe this embodiment,

[0122] Step 4 of the present embodiment uses the search method to search the target total torque Tt of the first drive motor and the second drive motor of the car and the torque optimal distribution coefficient k corresponding to the real-time speed of the car and distributes the target total torque Tt The process of giving the first drive motor and the second drive motor includes the following steps:

[0123] Step 41, calculate the output target total torque Tt (i') of the first drive motor and the second drive motor at time i';

[0124] Step 42, set the torque optimization distribution coefficient k, k is the ratio of the output torque of the first drive motor and the output target total torque Tt (i') of the first drive motor and the second drive motor at the moment i', k's The search interval [a, b], the initial search interval of the search interval [a, b] is [0, 1]; set the ...

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Abstract

The invention discloses a layered coordination energy efficiency control method for a plug-in four-wheel drive hybrid power automobile and relates to a hybrid power automobile control method. The method aims at solving the problem that energy efficiency of the automobile is not exerted to the optimum through existing hybrid power system control methods. The method comprises the steps that power system driving modes are switched in real time according to the operation condition of the automobile, and the target total torque Tt of two driving motors of the electric automobile is calculated under the three-type-power hybrid mode including the pure electric drive mode and two HEV modes; then, whether values of four nodes of a matrix grid Q<i, j> 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, and Tt is allocated to the first driving motor and the second driving motor according to k; or otherwise, the mean value k of the values of the four nodes of the matrix grid Q<i, j> is calculated, k is treated as the corresponding torque optimization allocation coefficient, and the total torque Tt is allocated to the first driving motor and the second driving motor according to k. The layered coordination energy efficiency control method is applicable to the field of automobile design and manufacturing.

Description

technical field [0001] The invention relates to a control method of a hybrid electric vehicle. Background technique [0002] Hybrid Electrical Vehicle (HEV) refers to a vehicle that is equipped with two power sources at the same time - thermal power source (generated by traditional gasoline engine or diesel engine) and electric power source (battery and electric motor). By using electric motors on hybrid electric vehicles, the power system can be flexibly adjusted according to the actual operating conditions of the vehicle, while the engine keeps working in the area with the best overall performance, thereby reducing fuel consumption and emissions. [0003] Hybrid vehicles use smaller engines that can meet the needs of car cruising, and rely on electric motors or other auxiliary devices to provide additional power for acceleration and climbing. The result is increased overall efficiency without sacrificing performance. Hybrids are designed to recover braking energy. In a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60W20/10B60W20/20B60W40/00B60W40/105B60K6/24B60K6/26B60K6/28B60K6/36B60K6/38
CPCB60K6/24B60K6/26B60K6/28B60K6/36B60K6/38B60W20/10B60W20/20B60W40/00B60W40/105Y02T10/62
Inventor 杜玖玉欧阳明高李建秋高明明王佳卢兰光
Owner TSINGHUA UNIV
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