Method for calculating concentration of exhaust hydrogen of fuel cell automobile, exhaust control system, use method of exhaust control system and storage medium
阅读说明：本技术 燃料电池汽车尾排氢气浓度计算方法、排气控制系统及其使用方法、存储介质 (Method for calculating concentration of exhaust hydrogen of fuel cell automobile, exhaust control system, use method of exhaust control system and storage medium ) 是由 何一凡 刘霞 于 2019-10-25 设计创作，主要内容包括：本发明涉及一种燃料电池汽车尾排氢气浓度计算方法、排气控制系统及其使用方法、存储介质,本发明的一种燃料电池汽车尾排氢气浓度计算方法能够方便地计算出燃料电池汽车尾排氢气浓度,从而为燃料电池排气控制系统提供数据以供燃料电池排气控制系统对尾气排出管所排出的混合气体中的氢气浓度进行控制。从而方便地控制燃料电池排出气体中的氢气浓度,使得燃料电池堆排放气体达标。(The invention relates to a method for calculating the concentration of hydrogen discharged from a fuel cell automobile, an exhaust control system, a use method thereof and a storage medium. Therefore, the concentration of hydrogen in the exhaust gas of the fuel cell is conveniently controlled, and the exhaust gas of the fuel cell stack reaches the standard.)
1. A method for calculating the concentration of hydrogen discharged from the tail of a fuel cell automobile comprises the following steps:
I) acquiring current I according to a current sensor on a bus of the fuel cell, and calculating and obtaining hydrogen flow required by electricity generation of the fuel cell based on the current Flow rate of oxygen
II) calculating to obtain the opening x of the pressure regulating valve according to the collected current of the pressure regulating valve passing through the valve core based on a pressure regulating valve kinetic equation;
III) flow capacity k corresponding to the degree of opening of the pressure regulating valve vPressure regulating valve front end gas pressure p inAnd temperature T inCalculating the hydrogen flow to the fuel cell stack;
IV) obtaining the air flow q to the fuel cell stack according to the flow sensor at the inlet of the air compressor Air；
V) the flow rate of hydrogen required for the production of electricity by the fuel cell obtained in the above-mentioned steps I), II), III)
2. The method for calculating the concentration of hydrogen discharged from the fuel cell vehicle as set forth in claim 1, wherein:
in step I), the hydrogen flow rate is calculated by the formula q h2_fc＝1.05×10 -8X I, oxygenThe flow is calculated by the formula q o2_fc＝8.29×10 -8×I；
In step II), the pressure regulating valve kinetic equation is
3. The method for calculating the concentration of hydrogen discharged from an automobile fuel cell according to claim 4, wherein the current collected by the current sensor is the current generated by the fuel cell.
4. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, is adapted to carry out the method of any one of claims 1 to 2.
5. A fuel cell exhaust control system for implementing the method for calculating the concentration of exhaust hydrogen of a fuel cell automobile according to any one of claims 1 to 3, comprising a fuel cell stack, a high-pressure hydrogen cylinder and an air compressor, wherein the high-pressure hydrogen cylinder supplies hydrogen to the fuel cell stack through a hydrogen supply pipe, the air compressor supplies air to the fuel cell stack through an air supply pipe, the fuel cell stack outputs residual air through an exhaust gas exhaust pipe, and the fuel cell further supplies residual hydrogen to the exhaust gas exhaust pipe through a hydrogen exhaust pipe; a circulating connecting pipe is connected between the hydrogen discharge pipe and the hydrogen conveying pipe, the hydrogen discharge pipe is connected with a circulating pump and a first flow control valve, one end of the circulating connecting pipe is connected between the circulating pump and the first flow control valve, and the other end of the circulating connecting pipe is connected to the hydrogen conveying pipe; a dilution connecting pipe is connected between the air conveying pipe and the tail gas discharge pipe; and a second flow control valve is arranged on the dilution connecting pipe.
6. The fuel cell exhaust gas control system according to claim 4, characterized in that: and a first temperature sensor, a pressure reducing valve, a second temperature sensor, a first pressure sensor, a pressure regulating valve and a second pressure sensor are sequentially arranged on the hydrogen conveying pipe from the high-pressure hydrogen cylinder to the fuel cell stack.
7. The fuel cell purge control system according to claim 4, the pressure regulating valve being an electromagnetic valve.
8. The fuel cell purge control system according to claim 6, wherein the current applied to the coil of the electromagnetic valve is preset by a controller to control the opening degree of the pressure regulating valve.
9. The fuel cell exhaust gas control system according to claim 4, characterized in that: and the fuel cell stack is connected with a current sensor.
10. The use method of the fuel cell exhaust control system is characterized by comprising the following operation steps:
a) acquiring the hydrogen concentration in the mixed gas discharged by the tail gas discharge pipe in real time;
b) judging the hydrogen concentration value in the mixed gas, if the hydrogen concentration in the mixed gas discharged by the tail gas discharge pipe exceeds a threshold value, judging the system fault, and reducing the hydrogen concentration in the mixed gas discharged by the tail gas discharge pipe by adopting one or more of the following modes:
i. reducing the switching frequency of the first flow control valve;
increasing the rotation speed of the air compressor to increase the air output;
and iii, increasing the air flow input into the tail gas discharge pipe by the air compressor through the second flow control valve.
11. The method of using a fuel cell vent control system of claim 10, wherein the hydrogen concentration threshold is 25000 ppm.
12. A computer storage medium on which a computer program is stored, which program, when being executed by a processor, is adapted to carry out the method of any one of claims 10 to 11.
Technical Field
The invention relates to a method for calculating the concentration of hydrogen discharged from a fuel cell automobile, an exhaust control system, a use method of the exhaust control system and a storage medium.
Background
The fuel cell car carries out hydrogen-oxygen reaction in the fuel cell stack through pure hydrogen in the hydrogen bottle and oxygen in the air, and the generated electric energy needs to discharge partial hydrogen outwards at regular time in the reaction process so as to ensure the normal and stable operation of the fuel cell. Therefore, the discharged hydrogen is guided into the tail exhaust pipe in a guiding mode, and is discharged out of the vehicle after being fully mixed with the residual air in the tail exhaust pipe. In order to ensure safety, regulations require that the hydrogen concentration at a position 10cm away from the central line of the tail pipe cannot exceed a certain threshold, so a hydrogen concentration sensor is usually arranged at a reasonable position of the tail pipe to monitor the concentration of the tail pipe in real time. However, in the operation process of the fuel cell engine, the tail exhaust gas is a high-humidity hydrogen-containing gas, so that the concentration of the tail exhaust gas is easy to lose efficacy, the fuel cell vehicle cannot monitor the concentration of the tail exhaust gas in real time, and certain risk is caused to the driving safety. Meanwhile, the tail exhaust hydrogen concentration is high in cost and failure rate, and the maintenance cost of the fuel cell is increased.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide a method for calculating a hydrogen concentration in an exhaust gas of a fuel cell automobile, an exhaust gas control system, a method for using the same, and a storage medium, which can easily calculate or control the hydrogen concentration in the exhaust gas of the fuel cell.
In order to achieve the above object, the present invention provides a method for calculating the concentration of exhaust hydrogen of a fuel cell automobile, comprising the following steps:
I) acquiring current I according to a current sensor on a bus of the fuel cell, and calculating and obtaining hydrogen flow required by electricity generation of the fuel cell based on the current
II) calculating to obtain the opening x of the pressure regulating valve according to the collected current of the pressure regulating valve passing through the valve core based on a pressure regulating valve kinetic equation;
III) flow capacity k corresponding to the degree of opening of the pressure regulating valve vPressure regulating valve front end gas pressure p inAnd temperature T inCalculating the hydrogen flow to the fuel cell stack;
IV) obtaining the air flow q to the fuel cell stack according to the flow sensor at the inlet of the air compressor Air；
V) the flow rate of hydrogen required for the production of electricity by the fuel cell obtained in the above-mentioned steps I), II), III)
Preferably, in step I), the hydrogen flow rate is calculated by the formula q h2_fc＝1.05×10 -8X I, the calculation formula of the oxygen flow is q o2_fc＝8.29×10 -8×I；
In step II), the pressure regulating valve kinetic equation is Wherein m the mass of the spool; x valve core displacement; an epsilon damping coefficient; c, the stiffness of the spring; f0 static pressure; fm driving magnetic force; the driving magnetic force is calculated as: f m＝i 2ω 2/4k(x 0-x), where i is the current through the coil of the pressure regulating valve, ω is the number of turns of the constant coil, k is the electromagnetic constant, and x0 is the distance from the end face of the core when the armature is not magnetically acted.
The present invention also provides a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the method for calculating a concentration of hydrogen in exhaust gas from a fuel cell vehicle according to the above-described technical solution or any one of the preferred technical solutions thereof.
The invention also provides a fuel cell exhaust control system, which is used for implementing the method for calculating the concentration of the exhaust hydrogen of the fuel cell automobile, and comprises a fuel cell stack, a high-pressure hydrogen cylinder and an air compressor, wherein the high-pressure hydrogen cylinder conveys hydrogen to the fuel cell stack through a hydrogen conveying pipe, the air compressor conveys air to the fuel cell stack through an air conveying pipe, the fuel cell stack outputs residual air through a tail gas exhaust pipe, and the fuel cell also conveys the residual hydrogen to the tail gas exhaust pipe through a hydrogen exhaust pipe; a circulating connecting pipe is connected between the hydrogen discharge pipe and the hydrogen conveying pipe, the hydrogen discharge pipe is connected with a circulating pump and a first flow control valve, one end of the circulating connecting pipe is connected between the circulating pump and the first flow control valve, and the other end of the circulating connecting pipe is connected to the hydrogen conveying pipe; a dilution connecting pipe is connected between the air conveying pipe and the tail gas discharge pipe; and a second flow control valve is arranged on the dilution connecting pipe.
Preferably, the hydrogen delivery pipe is provided with a first temperature sensor, a pressure reducing valve, a second temperature sensor, a first pressure sensor, a pressure regulating valve and a second pressure sensor in sequence from the high-pressure hydrogen cylinder to the fuel cell stack.
Preferably, the pressure regulating valve is a solenoid valve.
More preferably, the current passed by the coil of the electromagnetic valve is preset by a controller so as to control the opening degree of the pressure regulating valve.
Preferably, a current sensor is connected to the fuel cell stack.
The invention also provides a use method of the fuel cell exhaust control system, which comprises the following operation steps:
a) acquiring the hydrogen concentration in the mixed gas discharged by the tail gas discharge pipe in real time;
b) judging the hydrogen concentration value in the mixed gas, if the hydrogen concentration in the mixed gas discharged by the tail gas discharge pipe exceeds a threshold value, judging the system fault, and reducing the hydrogen concentration in the mixed gas discharged by the tail gas discharge pipe by adopting one or more of the following modes:
i. reducing the switching frequency of the first flow control valve;
increasing the rotation speed of the air compressor to increase the air output;
and iii, increasing the air flow input into the tail gas discharge pipe by the air compressor through the second flow control valve.
Preferably, the hydrogen concentration threshold is 25000 ppm.
The present invention also provides a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the method for calculating a concentration of hydrogen in exhaust gas from a fuel cell vehicle according to the above-described technical solution or any one of the preferred technical solutions thereof.
As described above, the method for calculating the concentration of hydrogen discharged from a fuel cell vehicle according to the present invention has the following advantages that the method for calculating the concentration of hydrogen discharged from a fuel cell vehicle according to the present invention can conveniently calculate the concentration of hydrogen discharged from a fuel cell vehicle, so as to provide data for a fuel cell exhaust control system to control the concentration of hydrogen in a mixed gas discharged from a tail gas discharge pipe by the fuel cell exhaust control system. Therefore, the concentration of hydrogen in the exhaust gas of the fuel cell is conveniently controlled, and the exhaust gas of the fuel cell stack reaches the standard. The fuel cell exhaust control system and the use method thereof, and the corresponding storage medium of the present invention also have the above-mentioned advantages, which are not described herein again.
Drawings
Fig. 1 is a schematic diagram showing the structure of a fuel cell exhaust control system according to the present invention.
Fig. 2 is a schematic diagram of a pressure regulating valve.
Fig. 3 shows a schematic diagram of a coil structure of a pressure regulating valve.
Fig. 4 shows a characteristic curve of the pressure regulating valve.
Description of the element reference numerals
1 fuel cell stack
2 high-pressure hydrogen cylinder
3 air compressor
4 hydrogen conveying pipe
5 air delivery pipe
6 hydrogen gas discharge pipe
7 tail gas discharge pipe
8 circulation connecting pipe
9 circulating pump
10 first flow control valve
11 dilution connecting pipe
12 second flow control valve
13 first temperature sensor
14 pressure reducing valve
15 second temperature sensor
16 first pressure sensor
17 pressure regulating valve
18 second pressure sensor
19 Current sensor
20 humidifier
21 intercooler
22 flow sensor
23 third flow rate control valve
24 hydrogen concentration detection sensor
25 armature
26 non-magnetic conduit
27 iron core
28 coil
29 spring
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
As shown in fig. 1, the present invention provides a fuel cell exhaust control system, which includes a fuel cell stack 11, a high-
In using a fuel cell exhaust gas control system of the present invention, if the hydrogen concentration in the exhaust gas discharged from the exhaust
The method for calculating the concentration of the tail exhaust hydrogen of the fuel cell automobile can be implemented by the fuel cell exhaust control system, and comprises the following steps:
I) the current I is collected according to a
II) calculating to obtain the opening x of the pressure regulating valve 17 according to the acquired current of the pressure regulating valve 17 passing through the valve core at present based on the kinetic equation of the pressure regulating valve 17;
III) flow capacity k corresponding to the degree of opening of pressure regulating valve 17 vAnd the gas pressure p at the front end of the pressure regulating valve 17 inAnd temperature T inCalculating the hydrogen flow to the fuel cell stack 1;
IV) obtaining the flow rate q of air to the fuel cell stack 1 from the
V) the flow rate of hydrogen required for the production of electricity by the fuel cell obtained in the above-mentioned steps I), II), III)
The method for calculating the concentration of the tail exhaust hydrogen of the fuel cell automobile can calculate the concentration of the tail exhaust hydrogen of the fuel cell automobile in real time so as to facilitate the control system to control the concentration of the tail exhaust hydrogen of the fuel cell automobile.
As a preferred embodiment, in step I), the hydrogen flow rate is calculated by the formula q h2_fc＝1.05×10 -8X I, the calculation formula of the oxygen flow is q o2_fc＝8.29×10 -8X is; in step II), the pressure regulating valve 17 has the kinetic equation of
By the method, the instantaneous hydrogen consumption of the fuel cell can be calculated in real time, and the hundred kilometer hydrogen consumption of the fuel cell automobile can be accurately calculated by combining the vehicle speed signal of the whole automobile based on the information; the instantaneous hydrogen consumption of the fuel cell can be calculated in real time, and based on the information, the instantaneous hydrogen consumption can be used as the input of the energy distribution of the fuel cell automobile to optimize the economy of the fuel cell automobile; the calculated hydrogen inlet flow of the fuel cell system is differed from the hydrogen flow consumed by the power generation of the fuel cell stack 11, and when the difference is greater than a certain threshold value, the risk of external leakage or serial leakage of the fuel cell system is indicated.
In order to facilitate the control system to operate the method for calculating the concentration of the exhaust hydrogen gas of the fuel cell automobile, the invention further provides a computer-readable storage medium on which a computer program is stored, wherein the computer program is executed by a processor to implement the method for calculating the concentration of the exhaust hydrogen gas of the fuel cell automobile. Those of ordinary skill in the art will understand that: all or part of the steps for implementing the above method embodiments may be performed by hardware associated with a computer program. The aforementioned computer program may be stored in a computer readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
In a fuel cell exhaust gas control system of the present invention, since a
In order to enable the air to better participate in the reaction, as a preferred embodiment, as shown in fig. 1, a fuel cell exhaust gas control system of the present invention further includes a
As shown in fig. 1, in order to facilitate monitoring and controlling parameters such as hydrogen flow rate, temperature, and pressure in the
The pressure regulating valve 17 is an important device for controlling the hydrogen intake flow rate of hydrogen and the intake pressure of the fuel cell stack 11, and as shown in fig. 2, the pressure regulating valve 17 is an electromagnetic valve whose basic components are an
In order to calculate the amount of hydrogen and air consumed by the fuel cell stack 11 for generating electricity, as a preferred embodiment, as shown in fig. 1, a
Through the method, the hydrogen concentration at the outlet of the tail
The present invention also provides a method for using a fuel cell exhaust control system corresponding to the fuel cell exhaust control system of the present invention, which is operated by the fuel cell exhaust control system according to the above technical solution or any preferred technical solution thereof, and comprises the following operation steps:
a) acquiring the hydrogen concentration in the mixed gas discharged from the tail
b) and judging the concentration value of hydrogen in the mixed gas, if the concentration value of hydrogen in the mixed gas discharged from the tail
i. decreasing the switching frequency of the first
increasing the rotation speed of the air compressor 3 to increase the air output;
the air flow rate of the air compressor 3 to the exhaust
Preferably, in the step b), the hydrogen concentration threshold is 25000 ppm.
The present invention also provides another computer storage medium having stored thereon a computer program which, when executed by a processor, implements a method of using a fuel cell exhaust control system as set forth in the preceding claim or any preferred claim thereof. Those of ordinary skill in the art will understand that: all or part of the steps for implementing the above method embodiments may be performed by hardware associated with a computer program. The aforementioned computer program may be stored in a computer readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Based on the technical scheme of the embodiment, the fuel cell exhaust control system and the use method thereof can conveniently control the hydrogen concentration in the exhaust gas of the fuel cell.
In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
- 上一篇：一种医用注射器针头装配设备
- 下一篇：一种固体氧化物燃料电池系统故障的处理方法