Control method of fuel cell system of hybrid electric vehicle

A technology for fuel cell systems and hybrid electric vehicles, applied in battery/fuel cell control devices, electric vehicles, vehicle energy storage, etc., can solve the problems of reduced durability and reduced life of fuel cell stacks, and achieve improved life and durability performance, avoid frequent start and stop, and avoid idling

Active Publication Date: 2019-07-16
ZHENGZHOU YUTONG BUS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a control method for the fuel cell system of a hybrid electric vehicle, which is used to solve the problems of reduced service life and durability of the fuel cell stack caused by frequent start and stop of the fuel cell while the vehicle is running

Method used

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  • Control method of fuel cell system of hybrid electric vehicle
  • Control method of fuel cell system of hybrid electric vehicle
  • Control method of fuel cell system of hybrid electric vehicle

Examples

Experimental program
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Embodiment 1

[0041] This embodiment 1 provides a fuel cell system for a hybrid electric vehicle, such as figure 1 As shown, it includes fuel cell, power battery, boost DCDC, all-in-one controller, drive motor and accessory DCDC, where the fuel cell is connected to the power battery through the boost DCDC, and the boost DCDC and power battery are connected in parallel to the all-in-one Among the controllers, the all-in-one controller distributes power to the drive motor and accessories DCDC; the fuel cell accessories include an air machine, heat dissipation system and hydrogen system, which are powered by the accessories DCDC; the preferred step-up DCDC is a unidirectional step-up DCDC. figure 1 Among them, MSD1 and MSD2 are manual maintenance switches.

[0042] The set power is not less than the power required for the normal operation of the fuel cell accessory to ensure that the fuel cell accessory still operates normally when the fuel cell has no power demand, and that the fuel cell does...

Embodiment 2

[0052]In order to ensure the constant power output of the fuel cell and the balance of the SOC of the vehicle, on the basis of Embodiment 1, this Embodiment 2 provides a control method for a fuel cell system of a hybrid electric vehicle, such as image 3 As shown, the specific steps are as follows:

[0053] Step S1, detecting the actual required power of the whole vehicle, the SOC of the power battery, the temperature and the voltage of the single cells.

[0054] The vehicle controller obtains the corresponding actual required power P of the vehicle, the SOC of the power battery, the cell temperature and the cell voltage through the sensors or controllers corresponding to the above detection objects.

[0055] Step S2, calculating the actual required power and the allowable steady-state charging power of the power battery.

[0056] By comparing the relationship between SOC and its set value and the relationship between P and its set value, the actual demanded power is obtained...

Embodiment 3

[0063] In order to avoid the overload of the fuel cell, on the basis of embodiment 2, this embodiment 3 provides a control method for a fuel cell system of a hybrid electric vehicle, such as Figure 4 As shown, the specific process also includes obtaining the loadable power limit of the fuel cell system when the fuel cell is started after step 1 of the above-mentioned embodiment 2.

[0064] When the fuel cell controller supplies power, it receives an instruction to start the fuel cell, controls the start of the fuel cell, and calculates the loadable power of the fuel cell system at this time, and outputs the limit value of the loadable power; in step S3 of embodiment 2 The loadable power limit is also compared with the actual demand power and the steady-state charging power or the set steady-state charging power to find the minimum value.

[0065] When the actual required power and charging required power are higher than the loadable power limit of the fuel cell system, the se...

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Abstract

The invention relates to the field of fuel cell system control, in particularly to a control method of a fuel cell system of a hybrid electric vehicle. According to the control method, under the situation that the fuel cell system has no power output on the whole vehicle, a fuel cell is still controlled to output at the set power, wherein the set power is not less than the power for maintaining work of fuel cell accessories, starting of the fuel cell is ensured, by obtaining the actual demanded power of the whole vehicle, the SOC of a power cell, the single body temperature and the single bodyvoltage, the actual demanded power and the steady-state charging power allowed by the power cell are obtained, finally, the set power of the whole vehicle on the fuel cell is obtained, it is ensuredthat the overcharging phenomenon of the power cell is avoided, meanwhile, constant power output of the fuel cell and balance of the SOC of the whole vehicle are ensured, frequent starting-stopping andload varying of the fuel cell are avoided, the life of an electric pile of the fuel cell is prolonged, the durability of the electric pile of the fuel cell and the power cell safety are improved, andoperation is more convenient.

Description

technical field [0001] The invention relates to the field of fuel cell system control, in particular to a control method for a hybrid electric vehicle fuel cell system. Background technique [0002] With the continuous increase of car ownership, the energy demand and air pollution problems brought by cars have become increasingly prominent. Due to its own advantages, fuel cells convert hydrogen and oxygen into electricity to drive vehicles without producing harmful gases, and are considered to be an important technical solution to resource and environmental issues. However, frequent startup and shutdown and idling of the fuel cell will seriously affect the life of the fuel cell. In the present invention, the idling speed of the fuel cell refers to the operation of the proton exchange membrane fuel cell stack in a low density area. When the fuel cell starts up, it is particularly important to use a control method to assist in utilizing the service life of the fuel cell under...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L58/40B60L58/20
CPCB60L58/20B60L58/40Y02T10/70
Inventor 王辉位跃辉刘振楠杨学青苏常军
Owner ZHENGZHOU YUTONG BUS CO LTD
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