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Control method of power-splitting hybrid electric vehicle brake assisted starting engine

A technology of hybrid electric vehicles and control methods, which is applied in the fields of hybrid electric vehicles, motor vehicles, transportation and packaging, etc., can solve problems such as large differences in control methods, reduce the failure rate of engine starting, improve driving comfort, and improve driving performance. dynamic effect

Active Publication Date: 2020-06-09
江西鼎盛新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the difference in mixing degree and composition structure of different hybrid power transmission devices, the control methods are quite different

Method used

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  • Control method of power-splitting hybrid electric vehicle brake assisted starting engine
  • Control method of power-splitting hybrid electric vehicle brake assisted starting engine
  • Control method of power-splitting hybrid electric vehicle brake assisted starting engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A control method for assisting the start of the engine by the brake of a power split hybrid electric vehicle. The control flow chart is as follows figure 2 As shown, proceed as follows:

[0036] Ⅰ If the vehicle controller detects the high-voltage start request signal, the vehicle controller controls the power battery high-voltage relay to close, and the power battery performs high-voltage power-on on the vehicle;

[0037] Ⅱ After the vehicle is powered on at high voltage, the vehicle controller determines whether the vehicle needs to start the engine. If the vehicle controller detects that the vehicle has a rapid acceleration request or the power battery SOC is lower than the pure electric threshold B or the vehicle has a high-power temperature control adjustment request , The pure electric threshold B is 25%, and the vehicle controller determines that the vehicle needs to start the engine. Go to step Ⅲ, otherwise the vehicle will enter pure electric mode;

[0038] Ⅲ The ve...

Embodiment 2

[0051] A control method for power-split hybrid vehicle brake assisted starting engine. The steps are basically the same as those of the power-split hybrid vehicle brake assisted start engine control method in Example 1. The difference is: pure electric threshold B The value is 30%, and the engine ignition speed threshold A is 1000r / min.

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Abstract

The invention provides a control method for an auxiliary starting engine of a power split hybrid electric vehicle brake. The control method for the auxiliary starting engine of the power split hybridelectric vehicle brake includes the steps that after a whole vehicle is powered on with high voltage and if the engine of the vehicle is determined to need starting, a first brake is controlled to beunlocked, and a hydraulic electric oil pump is simultaneously controlled to pressurize a second brake until the second brake is locked and second brake lock torque is obtained; then first motor demandtorque, second motor demand torque and preset engine demand torque are correspondingly and respectively sent to a first motor controller, a second motor controller and an engine controller through avehicle controller to execute accordingly; at the same time, the vehicle controller controls the second brake to output the second brake lock torque to a small sun gear of a double planetary row; whenengine speed reaches an engine ignition speed threshold A, the engine starts to inject fuel and ignite successfully, and then the starting of the engine is completed. The control method for the auxiliary starting engine of the power split hybrid electric vehicle brake has the advantages of being simple and effectively improving ride comfort and power performance of the hybrid electric vehicle during operation.

Description

Technical field [0001] The invention relates to the control field of hybrid electric vehicles, and in particular to a control method for assisting the start of the engine by the brake of a power split hybrid electric vehicle. Background technique [0002] As a multi-power source system, hybrid electric vehicles can select corresponding working modes according to different working conditions to give full play to the optimal characteristics of each power source. The driving of the vehicle does not completely depend on the engine. [0003] Hybrid electric vehicles use electric energy and chemical energy in low-speed and light-load conditions, and convert them into mechanical power to drive the vehicle; hybrid electric vehicles use on-board fuel (gasoline) and electric energy in medium-high-speed or heavy-load conditions, which will It is converted into mechanical power to drive the vehicle. Therefore, in order to achieve low emission and low energy consumption in a power split hybrid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60W20/00B60W20/20
CPCB60W20/00B60W20/20B60W2510/083
Inventor 单金荣钟发平周文太王晨刘国志刘冬于海生张彤
Owner 江西鼎盛新材料科技有限公司
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