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Input split type hybrid power flow control method

A technology of hybrid power and control method, which is applied in the field of vehicle hybrid power, can solve the problems that the price and performance are difficult to meet people's requirements, the driving range of pure electric vehicles is short, technical and cost problems, etc., so as to ensure fuel economy, Prevents overcharge or overdischarge and improves battery life

Inactive Publication Date: 2015-07-01
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0002] Energy saving, environmental protection and safety are the three major themes of today's automobile development; over the past ten years, people have been actively exploring the research and development of new energy-saving and environmentally friendly vehicles, pure electric vehicles (EV), hybrid electric vehicles (HEV) and fuel cell vehicles (FCEV) has become a research hotspot; due to the limitation of battery technology, pure electric vehicles have a short driving range, and it is difficult to meet people's requirements in terms of price and performance in a short period of time; although fuel cell electric vehicles have a good prospect, there are still technical problems. and cost issues; therefore, gasoline-electric hybrid vehicles developed on the basis of mature technologies have been increasingly widely researched and applied;

Method used

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  • Input split type hybrid power flow control method
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  • Input split type hybrid power flow control method

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Embodiment 1

[0025] Embodiment 1: as image 3 In the hybrid power system shown, the implementation steps of a split-speed converging-moment hybrid power flow control method in the present invention are as follows:

[0026] 1) Drive required power calculation

[0027] When actually driving a vehicle, the driving power demand of the vehicle is completely determined by the degree to which the driver depresses the accelerator pedal, that is, the accelerator pedal travel value; a linear model is used to describe the relationship between the required power and the pedal travel, and the model expression is

[0028] P N =Ax(1)

[0029] Among them, P N is the required power; A is the rated power of the hybrid system, and its value is determined by the designed traction characteristics of the vehicle; x is the stroke of the accelerator pedal, expressed as a percentage of the total stroke;

[0030] The required torque can be calculated according to the driving required power and the current vehic...

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Abstract

The invention discloses an input split type hybrid power flow control method and relates to the technical field of vehicle hybrid power. The method comprises, based on the input split type rotating speed and rotating torque coupling relationship, enabling an engine to be in a rotating speed control mode, and a generator and an electromotor to be in a rotating torque control mode; starting from the target power of a battery pack and a driving required power and based on an optimal fuel economy working curve, determining the working points of the engine, the generator and the electromotor, and meanwhile, ensuring the balance between electric quantity and power of batteries. According to the input split type hybrid power flow control method, firstly, the driving required power and the target power of the battery pack are determined, so that under the premise of ensuring vehicle dynamic performance, the regulating manner of the generator and every electromotor can be determined according to the characteristics of a input split type hybrid power system and accordingly the working points of every power unit can be adjusted flexibly, and further the fuel economy can be enhanced; through power flow control, the power and the electric quantity of the batteries can be in a reasonable state, over-charging or over-discharging of the batteries can be avoided, the system performance can be improved and the service life of the batteries can be prolonged.

Description

technical field [0001] The invention relates to the technical field of vehicle hybrid power, in particular to a method for controlling power flow of split-speed and combined-moment hybrid power. Background technique [0002] Energy saving, environmental protection and safety are the three major themes of today's automobile development; over the past ten years, people have been actively exploring the research and development of new energy-saving and environmentally friendly vehicles, pure electric vehicles (EV), hybrid electric vehicles (HEV) and fuel cell vehicles (FCEV) has become a research hotspot; due to the limitation of battery technology, pure electric vehicles have a short driving range, and it is difficult to meet people's requirements in terms of price and performance in a short period of time; although fuel cell electric vehicles have a good prospect, there are still technical problems. and cost issues; therefore, gasoline-electric hybrid vehicles developed on the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60W20/00B60W10/06B60W10/08B60W20/10
CPCB60W10/06B60W10/08B60W20/10B60W2710/0644B60W2710/083Y02T10/40Y02T10/62
Inventor 王伟达韩立金项昌乐马越刘辉
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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