CN109424575B - Flow control method and device and vehicle-mounted equipment - Google Patents
Flow control method and device and vehicle-mounted equipment Download PDFInfo
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- CN109424575B CN109424575B CN201710781214.0A CN201710781214A CN109424575B CN 109424575 B CN109424575 B CN 109424575B CN 201710781214 A CN201710781214 A CN 201710781214A CN 109424575 B CN109424575 B CN 109424575B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/02—Surge control
- F04D27/0261—Surge control by varying driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/02—Surge control
- F04D27/0207—Surge control by bleeding, bypassing or recycling fluids
- F04D27/0215—Arrangements therefor, e.g. bleed or by-pass valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/02—Surge control
- F04D27/0207—Surge control by bleeding, bypassing or recycling fluids
- F04D27/0223—Control schemes therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/02—Surge control
- F04D27/0253—Surge control by throttling
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- Control Of Positive-Displacement Air Blowers (AREA)
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Abstract
The invention provides a flow control method, a flow control device and vehicle-mounted equipment. Meanwhile, when the air compressor works in a preset surge area, the more positive value of the total air intake flow of the air compressor is larger than the total air intake flow, and the increased branch air is discharged by adjusting the bypass electromagnetic valve at the air side, so that the air input into the fuel cell is not changed, and the power provided by the fuel cell can reach the preset output power specified by the whole vehicle controller.
Description
Technical Field
The invention relates to the field of vehicle-mounted fuel cell control, in particular to a flow control method, a flow control device and vehicle-mounted equipment.
Background
The fuel cell is a device for directly converting chemical energy into electric energy, and the air compressor is an important supply device for supplying air to the fuel cell.
When a part of power sources of the vehicle are provided by the fuel cell, the air compressor works, and when some faults occur, such as overlarge air flow resistance caused by the fact that an air inlet throttle valve or an air outlet throttle valve is out of control, or the operating conditions are not coordinated in the process of lifting the load slope, the air compressor can work in a surge area, and further certain damage is caused to the air compressor.
In the prior art, when an air compressor works in a surge area, the air compressor is made to exit the surge area by actively reducing the output power of a fuel cell, specifically, a fuel cell control system (FCU) system can reduce the output power of the fuel cell to a specified value, then the corresponding air compressor rotating speed and the corresponding air outlet throttle opening when the output power is the specified value are searched, further, the rotating speed of the air compressor is controlled to reach the calculated air compressor rotating speed, and the air outlet throttle opening is controlled to reach the calculated air outlet throttle opening.
However, since the preset output power provided by the fuel cell specified by the vehicle controller is fixed, when the FCU system reduces the output power of the fuel cell, the power provided by the fuel cell cannot reach the preset output power specified by the vehicle controller, and thus the power of the vehicle is insufficient.
Disclosure of Invention
In view of this, the invention provides a flow control method, a flow control device and vehicle-mounted equipment, so as to solve the problem that when an air compressor works in a surge area, the power provided by a fuel cell cannot reach a preset output power specified by a vehicle controller, and further the power of a vehicle is insufficient, in a manner of actively reducing the output power of the fuel cell to enable the air compressor to exit the surge area.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method of flow control, comprising:
acquiring total intake flow, a pressure ratio of an air compressor and a pressure value of the air compressor;
calculating a total intake flow rate correction value of the air compressor corresponding to the pressure ratio;
judging whether the air compressor works in a preset surge area or not according to the total intake flow and the total intake flow correction value;
when the air compressor is judged to work in a preset surge region, adjusting the rotating speed of the air compressor and the opening of an air outlet throttle valve according to the intake total flow correction value and the pressure value of the air compressor so as to enable the air compressor to work in a non-preset surge region;
calculating to obtain branch flow according to the total intake flow and the intake total flow correction value;
and adjusting the opening of the air side bypass electromagnetic valve according to the branch flow so as to discharge the branch air.
Preferably, calculating a total intake air flow rate correction value of the air compressor corresponding to the pressure ratio includes:
searching the intake total flow correction value corresponding to the pressure ratio on a preset surge line;
according to total flow of admitting air and total flow of admitting air more positive value, judge whether the air compressor machine is working in predetermineeing the surge region, include:
and judging whether the total intake flow is smaller than the more positive value of the total intake flow.
Preferably, the adjusting the rotation speed of the air compressor and the opening degree of an air outlet throttle valve according to the total intake flow correction value and the pressure value of the air compressor includes:
calculating to obtain the rotating speed of the air compressor and the opening of an air outlet throttle valve by adopting a double closed-loop decoupling algorithm according to the intake total flow correcting value and the pressure value of the air compressor;
sending the rotating speed of the air compressor to the air compressor so as to change the rotating speed of the air compressor to the rotating speed of the air compressor;
sending the air outlet throttle opening to a throttle driving device to cause the throttle driving device to adjust the opening of the air outlet throttle to the air outlet throttle opening.
Preferably, calculating the branch flow according to the total intake flow and the total intake flow more positive value includes:
calculating a difference between the total intake flow correction value and the total intake flow;
and taking the calculated difference value as the branch flow.
Preferably, adjusting the opening degree of the air-side bypass solenoid valve according to the bypass flow rate includes:
inputting the branch flow into a preset bypass valve model to obtain the valve opening of the air side bypass electromagnetic valve;
and adjusting the opening degree of the air side bypass electromagnetic valve to the valve opening degree so as to discharge the branch air.
A flow control device comprising:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring total intake flow, a pressure ratio of an air compressor and a pressure value of the air compressor;
the flow calculation module is used for calculating a total intake flow correction value of the air compressor corresponding to the pressure ratio;
the judgment module is used for judging whether the air compressor works in a preset surge area or not according to the total intake flow and the intake total flow correction value;
the first adjusting module is used for adjusting the rotating speed of the air compressor and the opening of an air outlet throttle valve according to the total intake flow more value and the pressure value of the air compressor when the judging module judges that the air compressor works in a preset surge region, so that the air compressor works in a non-preset surge region;
the calculation module is used for calculating to obtain branch flow according to the total intake flow and the intake total flow correction value;
and the second adjusting module is used for adjusting the opening of the air side bypass electromagnetic valve according to the branch flow so as to discharge the branch air.
Preferably, the flow calculating module is configured to, when calculating a total intake flow correction value of the air compressor corresponding to the pressure ratio, specifically:
searching the intake total flow correction value corresponding to the pressure ratio on a preset surge line;
the judgment module is used for judging whether the air compressor works in a preset surge area according to the total intake flow and the total intake flow correction value, and is specifically used for:
and judging whether the total intake flow is smaller than the more positive value of the total intake flow.
Preferably, the first adjusting module comprises:
the calculation submodule is used for calculating the rotating speed of the air compressor and the opening of an air outlet throttle valve by adopting a double closed-loop decoupling algorithm according to the intake total flow correction value and the pressure value of the air compressor;
the third adjusting submodule is used for sending the rotating speed of the air compressor to the air compressor so as to change the rotating speed of the air compressor to the rotating speed of the air compressor;
and the fourth adjusting submodule is used for sending the opening of the air outlet throttle valve to a throttle valve driving device so as to enable the throttle valve driving device to adjust the opening of the air outlet throttle valve to the opening of the air outlet throttle valve.
Preferably, the calculating module is configured to, when calculating the branch flow according to the total intake flow and the total intake flow more positive value, specifically:
calculating a difference between the total intake flow correction value and the total intake flow;
and taking the calculated difference value as the branch flow.
Preferably, the second adjusting module is configured to, when adjusting the opening degree of the air-side bypass solenoid valve according to the branch flow rate, specifically:
inputting the branch flow into a preset bypass valve model to obtain the valve opening of the air side bypass electromagnetic valve;
and adjusting the opening degree of the air side bypass electromagnetic valve to the valve opening degree so as to discharge the branch air.
An in-vehicle apparatus includes a memory and a processor;
the memory is used for storing programs;
the processor is used for calling a program, wherein the program comprises:
acquiring total intake flow, a pressure ratio of an air compressor and a pressure value of the air compressor;
calculating a total intake flow rate correction value of the air compressor corresponding to the pressure ratio;
judging whether the air compressor works in a preset surge area or not according to the total intake flow and the total intake flow correction value;
when the air compressor is judged to work in a preset surge region, adjusting the rotating speed of the air compressor and the opening of an air outlet throttle valve according to the intake total flow correction value and the pressure value of the air compressor so as to enable the air compressor to work in a non-preset surge region;
calculating to obtain branch flow according to the total intake flow and the intake total flow correction value;
and adjusting the opening of the air side bypass electromagnetic valve according to the branch flow so as to discharge the branch air.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a flow control method, a flow control device and vehicle-mounted equipment. Meanwhile, when the air compressor works in a preset surge area, the more positive value of the total air intake flow of the air compressor is larger than the total air intake flow, and the increased branch air is discharged by adjusting the bypass electromagnetic valve at the air side, so that the air input into the fuel cell is not changed, and the power provided by the fuel cell can reach the preset output power specified by the whole vehicle controller.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural view of an air path of a fuel cell system for a vehicle according to the present invention;
FIG. 2 is a boundary diagram of a surge region and a non-surge region provided by the present invention;
FIG. 3 is a flow chart of a method of flow control according to the present invention;
fig. 4 is a schematic structural diagram of a flow control device provided in the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a flow control method, wherein the method is applied to a vehicle fuel cell system, and a schematic structural diagram of an air path of the vehicle fuel cell system is shown in fig. 1.
In which the components represented by the various numbers in figure 1 are described. 1-air filter, 2-air flow sensor, 3-fuel cell control unit, 4-air inlet throttle valve, 5-air compressor, 6-air inlet stack pressure sensor, 7-air humidifier, 8-fuel cell air side, 9-fuel cell hydrogen side, 10-air bypass flow sensor, 11-air side bypass electromagnetic valve, 12-air outlet throttle valve. Wherein the air compressor 5 may be a centrifugal air compressor.
The air flow sensor 2, the air intake throttle 4, the air compressor 5, the air stack pressure sensor 6 and the air outlet throttle 12 are all connected to the fuel cell control unit 3 and can receive control input from the fuel cell control unit 3.
This embodiment is based on installing an air compressor machine 5 between air intake throttle 4 and air advances to pile pressure sensor 6, advances to pile pressure sensor 6 front end at 5 exit ends of air compressor machine and air and adds the air bypass all the way, installs air bypass flow sensor 10 on the air bypass, and its signal output connects fuel cell control unit 3 to and install an air side bypass solenoid valve 11 additional at air bypass flow sensor 10 back, and its control signal's control end is connected with fuel cell control unit 3.
Specifically, air enters the air side 8 of the fuel cell through the air filter 1, the air flow sensor 2, the air intake throttle valve 4, the air compressor 5, the air inlet stack pressure sensor 6 and the air humidifier 7, and then the air in the air side 8 of the fuel cell can react with hydrogen in the hydrogen side 9 of the fuel cell to provide energy. Further, the reacted air is discharged from the air outlet throttle valve 12.
It should be noted that the present invention is a series of operations executed after the air compressor is judged to operate in the preset surge region, and the preset surge region is now described with reference to fig. 2.
In fig. 2, the abscissa represents the flow rate F and the ordinate represents the pressure ratio Pr. And the pressure ratio Pr is the ratio of the pressure value of the air compressor to the atmospheric pressure value.
The solid line in fig. 2 is the surge line set in the prior art and the dashed line in fig. 2 is the preset surge line set in the present invention, wherein a 10% shift of the surge line to the right results in the preset surge line, i.e. + 10% of the surge line in the figure. The area in the figure is divided into two areas according to the set surge line + 10% line. Wherein, the left area of the surge line + 10% is a preset surge area, and the right area of the surge line + 10% and the surge line + 10% are non-preset surge areas.
The purpose of setting the surge line + 10% is to start the operation of avoiding surge when the left region of the surge line + 10% is reached but the left region of the surge line is not reached, that is, when the air compressor is about to enter the surge region, and further, to avoid the air compressor from entering the surge region as soon as possible.
The executor of the flow rate control method provided in this embodiment is a fuel cell control unit 3, and referring to fig. 2, the flow rate control method includes:
s11, acquiring total intake flow, a pressure ratio value of the air compressor and a pressure value of the air compressor;
the total intake air flow rate is a flow rate value measured by the air flow sensor 2. The pressure ratio of the air compressor is calculated by the fuel cell control unit 3 based on the pressure value of the air compressor.
S12, calculating a total intake flow rate more positive value of the air compressor corresponding to the pressure ratio;
optionally, on the basis of this embodiment, step S12 includes:
and searching the intake total flow more positive value corresponding to the pressure ratio value on a preset surge line.
Specifically, the total intake flow and the pressure ratio of the air compressor are obtained, a total intake flow correction value corresponding to the obtained pressure ratio of the air compressor is found in a preset surge line in fig. 2, and assuming that the obtained total intake flow and the pressure ratio of the air compressor are combined to form a (F1, P) point in the graph, the total intake flow correction value is a value corresponding to an abscissa in a point B (F, P), which is F.
S13, judging whether the air compressor works in a preset surge area or not according to the total intake flow and the total intake flow correction value; and executing the step S14 when the air compressor is judged to work in the preset surge area, and ending when the air compressor is judged not to work in the preset surge area.
Optionally, on the basis of this embodiment, step S13 includes: and judging whether the total intake flow is smaller than the more positive value of the total intake flow.
Specifically, whether the obtained total intake flow is smaller than a total intake flow correction value is judged, when the total intake flow is smaller than the total intake flow correction value, the preset surge area is indicated, and when the total intake flow is not smaller than the total intake flow correction value, the preset surge area is not indicated. Specifically, it is determined whether F1 is less than F, and as can be seen from the figure, F1 is less than F.
S14, adjusting the rotating speed of the air compressor and the opening of an air outlet throttle valve according to the total intake flow correcting value and the pressure value of the air compressor so that the air compressor works in a non-preset surge area;
when the air compressor is judged to work in the preset surging area, the air inlet total flow correction value of the air compressor is larger than the air inlet total flow, and the fact that the air amount input into the air compressor is increased is shown.
Optionally, on the basis of this embodiment, step S14 includes:
1) calculating to obtain the rotating speed of the air compressor and the opening of an air outlet throttle valve by adopting a double closed-loop decoupling algorithm according to the intake total flow correcting value and the pressure value of the air compressor;
specifically, the double-closed-loop decoupling algorithm is input pressure and flow values, and the rotating speed of the air compressor and the opening degree of an air outlet throttle valve can be obtained through double-closed-loop PID (proportion integration differentiation) plus decoupling control.
2) Sending the rotating speed of the air compressor to the air compressor so as to change the rotating speed of the air compressor into the rotating speed of the air compressor;
3) the air outlet throttle opening degree is sent to the throttle valve driving device so that the throttle valve driving device adjusts the opening degree of the air outlet throttle valve to the air outlet throttle opening degree.
S15, calculating to obtain branch flow according to the total intake flow and the intake total flow correction value;
optionally, on the basis of this embodiment, step S14 includes:
and calculating the difference value between the intake total flow correction value and the intake total flow, and taking the calculated difference value as the branch flow.
Specifically, the difference between the total intake flow correction value and the total intake flow is F-F1 in fig. 2. It should be noted that the air corresponding to the branch flow rate is discharged to the atmosphere through the air bypass flow rate sensor 10 and the air bypass solenoid valve 11, the air bypass flow rate sensor 10 measures whether the flow rate of the input air meets a branch flow rate set value, and when the air bypass solenoid valve 11 is opened, the branch air can be discharged to the atmosphere through the air bypass solenoid valve 11.
And S16, adjusting the opening of the air side bypass electromagnetic valve according to the bypass flow rate so as to discharge the bypass air.
In this embodiment, when the air compressor works in the preset surge region, the rotation speed of the air compressor and the opening degree of the air outlet throttle valve are adjusted according to the intake total flow correction value and the pressure value of the air compressor, so that the air compressor can exit the preset surge region. Meanwhile, when the air compressor works in a preset surge area, the more positive value of the total air intake flow of the air compressor is larger than the total air intake flow, and the increased branch air is discharged by adjusting the bypass electromagnetic valve at the air side, so that the air input into the fuel cell is not changed, and the power provided by the fuel cell can reach the preset output power specified by the whole vehicle controller.
Optionally, on the basis of any of the foregoing embodiments, step S16 includes:
1) inputting the branch flow into a preset bypass valve model to obtain the valve opening of the air side bypass electromagnetic valve;
specifically, the preset bypass valve model is a flow opening model, and is obtained through modeling by a matrix laboratory mat lab offline tool box according to different flow rates and different data of the opening of the bypass electromagnetic valve.
After the preset bypass valve model is obtained, a valve opening can be output by inputting a flow value.
In this embodiment, the bypass flow is input into the preset bypass valve model, and the valve opening of the air-side bypass electromagnetic valve is obtained.
2) The opening degree of the air-side bypass solenoid valve is adjusted to a valve opening degree to discharge the bypass air.
Specifically, the fuel cell control unit 3 controls the opening of the air-side bypass electromagnetic valve to be adjusted to the valve opening.
It should be noted that, when the amount of air input into the air compressor increases, in order to ensure that the amount of air input into the air side 8 of the fuel cell remains unchanged, the increased amount of air needs to be discharged again to the atmosphere through the air side bypass solenoid valve.
In this embodiment, the valve opening degree can be obtained by presetting the bypass valve model, and then the opening degree of the air-side bypass electromagnetic valve can be controlled according to the valve opening degree to adjust to the valve opening degree, so that the branch air is discharged, and further the amount of the air input into the air side 8 of the fuel cell is kept unchanged, that is, the air in the air side 8 of the fuel cell has no sudden change of flow, and the power provided by the fuel cell can be ensured to reach the preset output power specified by the vehicle controller.
Alternatively, another embodiment of the present invention provides a flow control device, referring to fig. 4, including:
the acquiring module 101 is used for acquiring total intake flow, a pressure ratio of the air compressor and a pressure value of the air compressor;
the flow calculation module 102 is configured to calculate a total intake flow correction value of the air compressor corresponding to the pressure ratio;
the judging module 103 is configured to judge whether the air compressor works in a preset surge region according to the total intake flow and a corrected value of the total intake flow;
the first adjusting module 104 is configured to, when the judging module judges that the air compressor works in a preset surge region, adjust the rotation speed of the air compressor and the opening of an air outlet throttle according to the total intake flow correction value and the pressure value of the air compressor, so that the air compressor works in a non-preset surge region;
the calculating module 105 is configured to calculate a branch flow according to the total intake flow and the intake total flow correction value;
and the second adjusting module 106 is configured to adjust an opening of the air-side bypass solenoid valve according to the branch flow rate, so as to discharge the branch air.
Further, the flow calculating module 102 is configured to, when calculating a total intake flow of the air compressor corresponding to the pressure ratio, specifically:
searching the intake total flow correction value corresponding to the pressure ratio on a preset surge line;
the judgment module 103 is configured to judge whether the air compressor works in a preset surge region according to the total intake flow and the total intake flow correction value, and is specifically configured to:
and judging whether the total intake flow is smaller than the more positive value of the total intake flow.
Further, the first adjusting module 104 includes:
the calculation submodule is used for calculating the rotating speed of the air compressor and the opening of an air outlet throttle valve by adopting a double closed-loop decoupling algorithm according to the intake total flow correction value and the pressure value of the air compressor;
the third adjusting submodule is used for sending the rotating speed of the air compressor to the air compressor so as to change the rotating speed of the air compressor into the rotating speed of the air compressor;
and a fourth adjusting submodule for transmitting the air outlet throttle opening to the throttle valve driving device so that the throttle valve driving device adjusts the opening of the air outlet throttle valve to the air outlet throttle opening.
Further, the calculating module 105 is configured to calculate, according to the total intake flow and the total intake flow correction value, when the branch flow is obtained, specifically:
calculating the difference value between the intake total flow correction value and the intake total flow;
and taking the calculated difference value as the branch flow.
In this embodiment, when the air compressor works in the preset surge region, the rotation speed of the air compressor and the opening degree of the air outlet throttle valve are adjusted according to the intake total flow correction value and the pressure value of the air compressor, so that the air compressor can exit the preset surge region. Meanwhile, when the air compressor works in a preset surge area, the more positive value of the total air intake flow of the air compressor is larger than the total air intake flow, and the increased branch air is discharged by adjusting the bypass electromagnetic valve at the air side, so that the air input into the fuel cell is not changed, and the power provided by the fuel cell can reach the preset output power specified by the whole vehicle controller.
It should be noted that, for the working processes of each module and sub-module in this embodiment, please refer to the corresponding description in the above embodiments, which is not described herein again.
Optionally, on the basis of any one of the above embodiments of the apparatus, when the second adjusting module 106 is configured to adjust the opening degree of the air-side bypass electromagnetic valve according to the branch flow rate, specifically:
inputting the branch flow into a preset bypass valve model to obtain the valve opening of the air side bypass electromagnetic valve;
the opening degree of the air-side bypass solenoid valve is adjusted to a valve opening degree to discharge the bypass air.
In this embodiment, the valve opening degree can be obtained by presetting the bypass valve model, and then the opening degree of the air-side bypass electromagnetic valve can be controlled according to the valve opening degree to adjust to the valve opening degree, so that the branch air is discharged, and further the amount of the air input into the air side 8 of the fuel cell is kept unchanged, that is, the air in the air side 8 of the fuel cell has no sudden change of flow, and the power provided by the fuel cell can be ensured to reach the preset output power specified by the vehicle controller.
It should be noted that, for the working process of the module in this embodiment, please refer to the corresponding description in the above embodiment, which is not described herein again.
Optionally, in another embodiment of the present invention, an in-vehicle device is provided, which is characterized by including a memory and a processor;
a memory for storing a program;
the processor is used for calling a program, wherein the program comprises:
acquiring total intake flow, a pressure ratio of an air compressor and a pressure value of the air compressor;
calculating a total intake flow rate correction value of the air compressor corresponding to the pressure ratio;
judging whether the air compressor works in a preset surge area or not according to the total intake flow and the total intake flow correction value;
when the air compressor is judged to work in a preset surge region, adjusting the rotating speed of the air compressor and the opening of an air outlet throttle valve according to the intake total flow correction value and the pressure value of the air compressor so as to enable the air compressor to work in a non-preset surge region;
calculating to obtain branch flow according to the total intake flow and the intake total flow correction value;
and adjusting the opening of the air side bypass electromagnetic valve according to the branch flow so as to discharge the branch air.
In this embodiment, when the air compressor works in the preset surge region, the rotation speed of the air compressor and the opening degree of the air outlet throttle valve are adjusted according to the intake total flow correction value and the pressure value of the air compressor, so that the air compressor can exit the preset surge region. Meanwhile, when the air compressor works in a preset surge area, the more positive value of the total air intake flow of the air compressor is larger than the total air intake flow, and the increased branch air is discharged by adjusting the bypass electromagnetic valve at the air side, so that the air input into the fuel cell is not changed, and the power provided by the fuel cell can reach the preset output power specified by the whole vehicle controller.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (11)
1. A method of flow control, comprising:
acquiring a pressure ratio of an air compressor, a pressure value of the air compressor and total intake flow collected by an air flow sensor arranged in front of an air intake throttle of the air compressor;
calculating a total intake flow rate correction value of the air compressor corresponding to the pressure ratio;
judging whether the air compressor works in a preset surge area or not according to the total intake flow and the total intake flow correction value;
when the air compressor is judged to work in a preset surge region, adjusting the rotating speed of the air compressor and the opening of an air outlet throttle valve according to the intake total flow correction value and the pressure value of the air compressor so as to enable the air compressor to work in a non-preset surge region;
calculating to obtain branch flow according to the total intake flow and the intake total flow correction value;
and adjusting the opening degree of an air side bypass electromagnetic valve arranged on a branch at the outlet of the air compressor according to the branch flow so as to discharge the branch air.
2. The flow control method according to claim 1, wherein calculating a total intake air flow rate correction value of the air compressor corresponding to the pressure ratio includes:
searching the intake total flow correction value corresponding to the pressure ratio on a preset surge line;
according to total flow of admitting air and total flow of admitting air more positive value, judge whether the air compressor machine is working in predetermineeing the surge region, include:
and judging whether the total intake flow is smaller than the more positive value of the total intake flow.
3. The flow control method according to claim 1, wherein adjusting the rotation speed of the air compressor and the opening degree of an air outlet throttle valve in accordance with the total intake flow correction value and the pressure value of the air compressor includes:
calculating to obtain the rotating speed of the air compressor and the opening of an air outlet throttle valve by adopting a double closed-loop decoupling algorithm according to the intake total flow correcting value and the pressure value of the air compressor;
sending the rotating speed of the air compressor to the air compressor so as to change the rotating speed of the air compressor to the rotating speed of the air compressor;
sending the air outlet throttle opening to a throttle driving device to cause the throttle driving device to adjust the opening of the air outlet throttle to the air outlet throttle opening.
4. The flow control method according to claim 1, wherein calculating a branch flow rate from the total intake flow rate and the total intake flow rate correction value includes:
calculating a difference between the total intake flow correction value and the total intake flow;
and taking the calculated difference value as the branch flow.
5. The flow control method according to claim 1, wherein adjusting the opening degree of the air-side bypass solenoid valve in accordance with the bypass flow rate includes:
inputting the branch flow into a preset bypass valve model to obtain the valve opening of the air side bypass electromagnetic valve;
and adjusting the opening degree of the air side bypass electromagnetic valve to the valve opening degree so as to discharge the branch air.
6. A flow control device, comprising:
the acquisition module is used for acquiring a pressure ratio value of an air compressor, a pressure value of the air compressor and total intake flow acquired by an air flow sensor arranged in front of an air intake throttle valve of the air compressor;
the flow calculation module is used for calculating a total intake flow correction value of the air compressor corresponding to the pressure ratio;
the judgment module is used for judging whether the air compressor works in a preset surge area or not according to the total intake flow and the intake total flow correction value;
the first adjusting module is used for adjusting the rotating speed of the air compressor and the opening of an air outlet throttle valve according to the total intake flow more value and the pressure value of the air compressor when the judging module judges that the air compressor works in a preset surge region, so that the air compressor works in a non-preset surge region;
the calculation module is used for calculating to obtain branch flow according to the total intake flow and the intake total flow correction value;
and the second adjusting module is used for adjusting the opening degree of an air side bypass electromagnetic valve arranged on a branch at the outlet of the air compressor according to the branch flow so as to discharge the air of the branch.
7. The flow control device according to claim 6, wherein the flow calculating module is configured to, when calculating a total intake flow of the air compressor corresponding to the pressure ratio, specifically:
searching the intake total flow correction value corresponding to the pressure ratio on a preset surge line;
the judgment module is used for judging whether the air compressor works in a preset surge area according to the total intake flow and the total intake flow correction value, and is specifically used for:
and judging whether the total intake flow is smaller than the more positive value of the total intake flow.
8. The flow control device of claim 6, wherein the first tuning module comprises:
the calculation submodule is used for calculating the rotating speed of the air compressor and the opening of an air outlet throttle valve by adopting a double closed-loop decoupling algorithm according to the intake total flow correction value and the pressure value of the air compressor;
the third adjusting submodule is used for sending the rotating speed of the air compressor to the air compressor so as to change the rotating speed of the air compressor to the rotating speed of the air compressor;
and the fourth adjusting submodule is used for sending the opening of the air outlet throttle valve to a throttle valve driving device so as to enable the throttle valve driving device to adjust the opening of the air outlet throttle valve to the opening of the air outlet throttle valve.
9. The flow control device according to claim 6, wherein the calculating module is configured to calculate the branch flow rate according to the total intake flow rate and the total intake flow rate correction value, and is specifically configured to:
calculating a difference between the total intake flow correction value and the total intake flow;
and taking the calculated difference value as the branch flow.
10. The flow control device according to claim 6, wherein the second adjusting module is configured to, when adjusting the opening degree of the air-side bypass solenoid valve according to the branch flow rate, specifically:
inputting the branch flow into a preset bypass valve model to obtain the valve opening of the air side bypass electromagnetic valve;
and adjusting the opening degree of the air side bypass electromagnetic valve to the valve opening degree so as to discharge the branch air.
11. An in-vehicle apparatus, characterized by comprising a memory and a processor;
the memory is used for storing programs;
the processor is used for calling a program, wherein the program comprises:
acquiring a pressure ratio of an air compressor, a pressure value of the air compressor and total intake flow collected by an air flow sensor arranged in front of an air intake throttle of the air compressor;
calculating a total intake flow rate correction value of the air compressor corresponding to the pressure ratio;
judging whether the air compressor works in a preset surge area or not according to the total intake flow and the total intake flow correction value;
when the air compressor is judged to work in a preset surge region, adjusting the rotating speed of the air compressor and the opening of an air outlet throttle valve according to the intake total flow correction value and the pressure value of the air compressor so as to enable the air compressor to work in a non-preset surge region;
calculating to obtain branch flow according to the total intake flow and the intake total flow correction value;
and adjusting the opening degree of an air side bypass electromagnetic valve arranged on a branch at the outlet of the air compressor according to the branch flow so as to discharge the branch air.
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| CN112421075A (en) * | 2020-11-17 | 2021-02-26 | 一汽解放汽车有限公司 | Air supply system of fuel cell engine |
| CN115799568B (en) * | 2023-01-19 | 2023-04-28 | 国家电投集团氢能科技发展有限公司 | Fuel cell cathode system and control method thereof |
| CN116201758A (en) * | 2023-02-20 | 2023-06-02 | 上海清志新能源技术有限公司 | Control method, system, equipment and storage medium of air compressor |
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| JP2619360B2 (en) * | 1986-02-21 | 1997-06-11 | 株式会社日立製作所 | Surging prevention device for turbo compressor |
| US8101308B2 (en) * | 2008-06-25 | 2012-01-24 | GM Global Technology Operations LLC | Adaptive compressor surge control in a fuel cell system |
| JP5871157B2 (en) * | 2011-10-03 | 2016-03-01 | 株式会社Ihi | Method for preventing surging of centrifugal compression equipment |
| CN102518598A (en) * | 2011-12-31 | 2012-06-27 | 北京时代科仪新能源科技有限公司 | Centrifugal air compressor and control method and system thereof |
| CN102562639B (en) * | 2012-01-13 | 2014-11-12 | 杭州哲达科技股份有限公司 | Anti-surge control method of blast furnace blower |
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| KR101592709B1 (en) * | 2014-06-13 | 2016-02-15 | 현대자동차주식회사 | Fuel cell system for vehicle and method for controlling the same |
| CN104533820B (en) * | 2014-12-26 | 2017-01-11 | 沈阳鼓风机集团自动控制系统工程有限公司 | Anti surge control method and device |
| CN206309631U (en) * | 2016-12-01 | 2017-07-07 | 王先宏 | Compressor surge control device and system |
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