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Control method for auxiliary starting engine of power split hybrid electric vehicle brake

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 engine starting failure rate, improve driving dynamics, and the method is simple Feasible effect

Active Publication Date: 2018-09-21
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 for auxiliary starting engine of power split hybrid electric vehicle brake
  • Control method for auxiliary starting engine of power split hybrid electric vehicle brake
  • Control method for auxiliary starting engine of power split hybrid electric vehicle brake

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A control method for power-split hybrid electric vehicle brake-assisted starting engine, the control flow chart of which is as follows figure 2 shown, proceed as follows:

[0036] Ⅰ If the vehicle controller detects a high-voltage start request signal, the vehicle controller controls the high-voltage relay of the power battery to close, and the power battery powers up the vehicle with high voltage;

[0037]Ⅱ After the vehicle is powered on at high voltage, the vehicle controller judges 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 value of pure electric threshold B is 25%, then the vehicle controller judges that the vehicle needs to start the engine. Then execute step Ⅲ, otherwise the vehicle enters the pure electric mode;

[0038] III The ...

Embodiment 2

[0051] A control method for power-split hybrid electric vehicle brake assisted starting engine, its steps are basically the same as the steps of the control method for power-split hybrid electric vehicle brake assisted start engine in Embodiment 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 a hybrid electric vehicle, in particular to a control method for a power-split hybrid electric vehicle brake assisting engine start. Background technique [0002] As a multi-power source system, a hybrid vehicle can select the corresponding working mode according to different working conditions, and 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 vehicles use electrical energy and chemical energy in low-speed and light-load conditions, and convert them into mechanical power to drive vehicles; hybrid vehicles use on-board fuel (gasoline) and It is converted into mechanical power to drive the vehicle. Therefore, in order to achieve low emissions and low energy consumption in a power-split hybrid electric vehicle, the working mode of the hybrid transmission is switched frequently under different working co...

Claims

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Application Information

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Patent Type & Authority Applications(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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