CN114914482B - Self-regulating electronic back pressure valve, fuel cell system and control method - Google Patents
Self-regulating electronic back pressure valve, fuel cell system and control method Download PDFInfo
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- CN114914482B CN114914482B CN202210749357.4A CN202210749357A CN114914482B CN 114914482 B CN114914482 B CN 114914482B CN 202210749357 A CN202210749357 A CN 202210749357A CN 114914482 B CN114914482 B CN 114914482B
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- 239000000446 fuel Substances 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000004891 communication Methods 0.000 claims abstract description 28
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000011161 development Methods 0.000 description 4
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- 238000010586 diagram Methods 0.000 description 4
- 239000012528 membrane Substances 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 2
- 230000033772 system development Effects 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/0438—Pressure; Ambient pressure; Flow
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
- H01M8/04746—Pressure; Flow
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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Abstract
The invention discloses a self-adjusting electronic back pressure valve, a fuel cell system and a control method, wherein the self-adjusting electronic back pressure valve comprises a back pressure valve body, the back pressure valve body comprises a back pressure valve controller, a motor, a valve body and a valve core diaphragm, and the back pressure valve controller comprises a communication power supply module, a pressure acquisition module, a position acquisition module, a driving module and an operation control module; the operation control module is used for receiving data output by the communication power supply module, the pressure acquisition module and the position acquisition module, comparing and analyzing a pressure value instruction sent by external equipment with a pressure value signal for acquiring an external air flow channel, outputting a rotation instruction signal to the driving module after analysis and operation, and driving the motor by the driving module to control the opening of the valve core diaphragm, so that the opening of the back pressure valve body is adjusted.
Description
Technical field:
the invention relates to a self-regulating electronic back pressure valve, a fuel cell system and a control method.
The background technology is as follows:
In medium (or high) pressure PEMFC systems, on the one hand, high operating pressures increase the power density of the fuel cell stack; on the other hand, devices that provide high pressure air, such as compressors, consume more power than the fans of the low voltage stacks, thereby increasing the auxiliary system power consumption of the fuel cell engine system. For an air compressor system, a plurality of back pressure pressures can be corresponding to the same flow and rotating speed, so that different system efficiencies can occur. Therefore, the air system needs to be controlled in real time at different working points to achieve the optimal air compressor rotating speed and back pressure, so that the power consumption of an auxiliary system can be greatly reduced, and the service life of a pile can be further prolonged (the service life of the pile can be greatly reduced under the condition of insufficient air supply).
At present, a traditional backpressure valve controller receives an engine ECU instruction, outputs a corresponding control signal to a motor drive signal, combines position feedback information of a valve to enable the valve to rotate to a corresponding angle, and is disclosed in a patent number CN201310145316.5 and a patent name as a backpressure control system of a vehicle-mounted fuel cell engine, wherein the patent has the following technical problems:
1) The back pressure regulation and control needs to collect data and calculate and give out valve rotation instructions through a fuel cell system controller FCU, and the chain length is controlled and complicated, so that the back pressure valve is slow in response, the opening of the regulating valve is delayed, and the stable operation of the fuel cell system is not facilitated;
2) The backpressure valves with different calibers and styles are required to be calibrated independently for the same fuel cell system, are not friendly to compatible development of parts of the fuel cell system, and have high development cost.
The invention comprises the following steps:
the invention aims to provide a self-regulating electronic back pressure valve, which can solve the technical problems that in the prior art, back pressure regulation needs to acquire data through a fuel cell system controller FCU and calculate and give a valve rotation instruction, the control chain length is complicated, the back pressure valve is slow in response, the opening of the regulating valve is delayed, and the stable operation of a fuel cell system is not facilitated.
The invention further aims to provide a fuel cell system, which can solve the technical problems that backpressure valves with different calibers and styles in the prior art need to be calibrated independently for the same fuel cell system, are not friendly for compatible development of parts of the fuel cell system and have high development cost
The third object of the present invention is to provide a control method for controlling a fuel cell, which solves the technical problems of slow response of a back pressure valve, delay in opening of a regulating valve, and unfavorable stable operation of a fuel cell system caused by the control of the chain length and the complexity.
The aim of the invention is achieved by the following technical scheme.
The invention aims to provide a self-regulating electronic back pressure valve, which is characterized in that: including the backpressure valve body, the backpressure valve body includes backpressure valve controller, motor, valve body and case diaphragm, and the case diaphragm is installed in the valve body the inside, opens and shuts through the opening and shutting of case diaphragm and realizes opening or closing of backpressure valve body, wherein:
the back pressure valve controller comprises a communication power supply module, a pressure acquisition module, a position acquisition module, a driving module and an operation control module;
the motor is arranged on the valve body and used for controlling the opening of the valve core diaphragm;
The communication power supply module is used for establishing connection communication between the operation control module and the external equipment, and the operation control module receives a pressure value instruction sent by the external equipment through the communication power supply module;
The pressure acquisition module is mainly used for acquiring pressure value signals of an external air flow channel and transmitting the acquired pressure value signals to the operation control module;
The position acquisition module mainly acquires the stay position of the valve core diaphragm at any moment, is used as a reference for the rotation direction and angle of the driving motor, and feeds back the acquired position signal to the operation control module;
The driving module is used for driving the motor to rotate forward or reversely and rotate by a certain angle, and controlling the opening of the valve core diaphragm, so that the pressure value of the external air flow channel is regulated to be equal to the pressure value command sent by the external equipment;
The operation control module is used for receiving data output by the communication power supply module, the pressure acquisition module and the position acquisition module, comparing and analyzing a pressure value instruction sent by external equipment with a pressure value signal for acquiring an external air flow channel, outputting a rotation instruction signal to the driving module by the operation control module after analysis and operation, and driving the motor by the driving module to control the opening of the valve core diaphragm, thereby realizing the adjustment of the opening of the back pressure valve body
The pressure acquisition module is also connected with a pressure sensor, and the pressure sensor is arranged in the external air flow channel and acquires a pressure value signal of the external air flow channel.
The driving module comprises an electronic switch tube Q1, an electronic switch tube Q2, an electronic switch tube Q3 and an electronic switch tube Q4, wherein the electronic switch tube Q1 and the electronic switch tube Q2 form a first bridge arm, the electronic switch tube Q3 and the electronic switch tube Q4 form a second bridge arm, one wiring terminal A of the motor is electrically connected between the electronic switch tube Q1 and the electronic switch tube Q2, the other wiring terminal B of the motor is electrically connected between the electronic switch tube Q3 and the electronic switch tube Q4, and the control ends of the electronic switch tube Q1, the electronic switch tube Q2, the electronic switch tube Q3 and the electronic switch tube Q4 are electrically connected with the operation control module.
The motor is a stepping motor or a servo motor.
The operation control module is a singlechip MCU, and the electronic switch tube Q1, the electronic switch tube Q2, the electronic switch tube Q3 and the electronic switch tube Q4 adopt MOS tubes.
The utility model provides a fuel cell system, including air supply system, cooling system, hydrogen supply system, pile module, fuel cell system controller FCU and self-interacting electronic back pressure valve, air supply system includes air cleaner, flowmeter, air compressor machine, intercooler and humidifier, outside air is through air cleaner, flowmeter, air compressor machine, intercooler and humidifier in proper order, then sends the air inlet of pile module, and the exhaust of exhaust tail of air outlet from pile module is again through the humidification of humidifier processing, discharges after flowing through self-interacting electronic back pressure valve, its characterized in that: the self-regulating electronic back pressure valve is the self-regulating electronic back pressure valve.
The communication power supply module of the back pressure valve controller is connected with the fuel cell system controller FCU for communication, the fuel cell system controller FCU controls the rotating speed of the air compressor to adjust the conveying quantity of the air compressor according to the signal sent by the flowmeter, the fuel cell system controller FCU sends a pressure value instruction to the communication power supply module according to the conveying quantity of the air compressor, and the communication power supply module sends the pressure value instruction to the operation control module;
The pressure sensor that the pressure acquisition module of backpressure valve controller connects sets up in the air inlet department of pile module, and pressure acquisition module passes through pressure sensor and gathers the pressure value of the air inlet department that gets into pile module, and pressure acquisition module sends the pressure value signal who gathers to operation control module.
The fuel cell system controller FCU sends a pressure value command P0, the pressure value at the air inlet of the electric pile module is P1, the operation control module performs comparison analysis according to the fuel cell system controller FCU sending the pressure value command P0 and the pressure value at the air inlet of the electric pile module being P1, and after analysis and operation, the operation control module outputs a rotation command signal to the driving module, and the driving module drives the motor to control the opening of the valve core diaphragm, so that the opening of the back pressure valve body is adjusted.
When the pressure value at the air inlet of the pile module is P1 minus the pressure value command sent by the fuel cell system controller FCU and is more than 0, the back pressure valve controller gives a driving motor rotation command, the motor controls the valve core diaphragm, the opening of the back pressure valve body is increased, and meanwhile, the position acquisition module acquires the position of the valve core diaphragm, and the acquired position signal is fed back to the operation control module to ensure that the motor rotates normally;
When the pressure value at the air inlet of the galvanic pile module is P1 and the pressure value command sent by the fuel cell system controller FCU is less than 0, the back pressure valve controller gives a driving motor rotation command, the motor drives the valve core to rotate, the opening of the back pressure valve body is reduced, meanwhile, the position acquisition module acquires the position of the valve core membrane, and the acquired position signal is fed back to the operation control module to ensure that the motor rotates normally.
When the pressure value at the air inlet of the electric pile module is P1 minus the pressure value command sent by the fuel cell system controller FCU, and P0 is equal to 0, the opening degree of the back pressure valve body meets the requirement, the back pressure valve controller gives a command for stopping driving the motor until the next target pressure value sent by the fuel cell system controller FCU gives a new target pressure command.
A control method of a fuel cell system, characterized by: with the fuel cell system described above, the control method includes the steps of:
Step 1: the pressure value at the air inlet of the input pile module is P1, and the fuel cell system controller FCU sends out a pressure value instruction to be P0;
Step 2: judging whether the pressure value at the air inlet of the electric pile module is P1 minus a pressure value instruction sent by the fuel cell system controller FCU is P0 which is more than 0; if the back pressure valve is in the open state, the back pressure valve controller gives out a rotation instruction of the driving motor, the motor controls the valve core diaphragm, the opening degree of the back pressure valve body is increased, meanwhile, the position acquisition module acquires the position of the valve core diaphragm, the acquired position signal is fed back to the operation control module, the motor is ensured to rotate normally, and then the step 3 is carried out; if not, the back pressure valve controller gives a driving motor rotation instruction, the motor controls the valve core diaphragm, the opening of the back pressure valve body is reduced, the position acquisition module acquires the position of the valve core diaphragm, the acquired position signal is fed back to the operation control module, the motor is ensured to rotate normally, and then the step 3 is carried out.
Step 3: judging whether the pressure value at the air inlet of the electric pile module is P1 minus a pressure value instruction sent by the fuel cell system controller FCU is P0 equal to 0 or not; if so, the back pressure valve controller gives a command for stopping the driving motor until a new target pressure command is given by a target pressure value sent by the fuel cell system controller FCU at the next time; if not, returning to the step 2.
Compared with the prior art, the invention has the following effects:
1) The self-adjusting electronic back pressure valve comprises a back pressure valve body, wherein the back pressure valve body comprises a back pressure valve controller, a motor, a valve body and a valve core diaphragm, the valve core diaphragm is arranged in the valve body, and the back pressure valve body is opened or closed through opening and closing of the valve core diaphragm, wherein the back pressure valve body comprises a valve body, a valve body cover and a valve core diaphragm, wherein the valve core diaphragm is arranged on the valve body, the valve core diaphragm is arranged on the valve body cover, and the valve body is arranged on the valve body cover: the back pressure valve controller comprises a communication power supply module, a pressure acquisition module, a position acquisition module, a driving module and an operation control module; the operation control module is used for receiving data output by the communication power supply module, the pressure acquisition module and the position acquisition module, comparing and analyzing a pressure value instruction sent by external equipment with a pressure value signal for acquiring an external air flow channel, outputting a rotation instruction signal to the driving module by the operation control module after analysis and operation, driving the valve core diaphragm opening by the driving module, thereby realizing the adjustment of the opening of the back pressure valve body, receiving target pressure by the self-adjusting back pressure valve, acquiring the actual pressure of the external air flow channel and automatically adjusting the opening of the valve.
2) The fuel cell system of the invention comprises an air supply system, a cooling system, a hydrogen supply system, a pile module, a fuel cell system controller FCU and a self-regulating electronic back pressure valve, wherein the air supply system comprises an air filter, a flowmeter, an air compressor, an intercooler and a humidifier, external air sequentially passes through the air filter, the flowmeter, the air compressor, the intercooler and the humidifier and then is sent to an air inlet of the pile module, tail exhaust gas discharged from an air outlet of the pile module is humidified by the humidifier again and is discharged after flowing through the self-regulating electronic back pressure valve, and the fuel cell system is characterized in that: the self-regulating electronic back pressure valve is the self-regulating electronic back pressure valve, after the target pressure of each working point is calibrated by the fuel cell system, the self-regulating back pressure valves of different factories, calibers and batches can be selected and switched at any time, the valves do not need to be calibrated again independently, the system development efficiency is greatly improved, and the cost is low.
3) The control method of the fuel cell system is simple and reliable in control, easy to realize, low in realization cost, capable of guaranteeing the requirements of the pressure and flow of the air channel of the fuel cell system, enabling the fuel cell system to normally operate and saving energy.
4) Other advantages of the present invention are described in detail in the examples section.
Description of the drawings:
FIG. 1 is a schematic diagram of a back pressure valve body according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of the connection of a back pressure valve body to a pressure sensor and external equipment provided in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram of a driving module according to a first embodiment of the present invention;
Fig. 4 is a schematic diagram of a fuel cell system according to a second embodiment of the present invention;
fig. 5 is a flowchart provided by a third embodiment of the present invention.
The specific embodiment is as follows:
The invention is described in further detail below by means of specific embodiments in connection with the accompanying drawings.
As shown in fig. 1 to 3, the embodiment provides a self-adjusting electronic back pressure valve, including a back pressure valve body, the back pressure valve body includes a back pressure valve controller, a motor, a valve body and a valve core diaphragm, the valve core diaphragm is installed in the valve body, and opening or closing of the back pressure valve body is realized through opening or closing of the valve core diaphragm, wherein:
the back pressure valve controller comprises a communication power supply module, a pressure acquisition module, a position acquisition module, a driving module and an operation control module;
the motor is arranged on the valve body and used for controlling the opening of the valve core diaphragm;
The communication power supply module is used for establishing connection communication between the operation control module and the external equipment, and the operation control module receives a pressure value instruction sent by the external equipment through the communication power supply module;
The pressure acquisition module is mainly used for acquiring pressure value signals of an external air flow channel and transmitting the acquired pressure value signals to the operation control module;
The position acquisition module mainly acquires the stay position of the valve core diaphragm at any moment, is used as a reference for the rotation direction and angle of the driving motor, and feeds back the acquired position signal to the operation control module;
The driving module is used for driving the motor to rotate forward or reversely and rotate by a certain angle, and controlling the opening of the valve core diaphragm, so that the pressure value of the external air flow channel is regulated to be equal to the pressure value command sent by the external equipment;
The operation control module is used for receiving data output by the communication power supply module, the pressure acquisition module and the position acquisition module, comparing and analyzing a pressure value instruction sent by external equipment with a pressure value signal for acquiring an external air flow channel, outputting a rotation instruction signal to the driving module after analysis and operation, and driving the motor by the driving module to control the opening of the valve core diaphragm, so that the opening of the back pressure valve body is adjusted. The self-regulating back pressure valve receives target pressure, collects actual pressure of an external air flow channel and automatically adjusts the opening of the valve, has the advantages of simplifying a control strategy of a fuel cell system, being short in response time of a back pressure valve body, self-fault feedback and the like, is reasonable in structural arrangement, simple to control, good in compatibility and greatly helpful for stable and reliable operation of the fuel cell system. M in the figure represents a motor.
The pressure acquisition module is also connected with a pressure sensor, the pressure sensor is arranged in the external air flow channel and is used for acquiring pressure value signals of the external air flow channel, the structural arrangement is reasonable, and the pressure sensor is arranged to be convenient for acquiring the pressure value of the external flow channel.
The driving module comprises an electronic switch tube Q1, an electronic switch tube Q2, an electronic switch tube Q3 and an electronic switch tube Q4, wherein the electronic switch tube Q1 and the electronic switch tube Q2 form a first bridge arm, the electronic switch tube Q3 and the electronic switch tube Q4 form a second bridge arm, one wiring terminal A of the motor is electrically connected between the electronic switch tube Q1 and the electronic switch tube Q2, the other wiring terminal B of the motor is electrically connected between the electronic switch tube Q3 and the electronic switch tube Q4, and the control ends of the electronic switch tube Q1, the electronic switch tube Q2, the electronic switch tube Q3 and the electronic switch tube Q4 are electrically connected with the operation control module.
The motor is a stepper motor or a servo motor.
The operation control module is a singlechip MCU, and the electronic switch tube Q1, the electronic switch tube Q2, the electronic switch tube Q3 and the electronic switch tube Q4 adopt MOS tubes.
Embodiment two:
As shown in fig. 1, 2 and 4, a fuel cell system includes an air supply system, a cooling system, a hydrogen supply system, a stack module, a fuel cell system controller FCU and a self-regulating electronic back pressure valve, the air supply system includes an air filter, a flow meter, an air compressor, an intercooler and a humidifier, external air sequentially passes through the air filter, the flow meter, the air compressor, the intercooler and the humidifier, and then is sent to an air inlet of the stack module, tail exhaust gas discharged from an air outlet of the stack module is humidified again by the humidifier, and is discharged after flowing through the self-regulating electronic back pressure valve, and the fuel cell system is characterized in that: the self-regulating electronic back pressure valve is the self-regulating electronic back pressure valve in the first embodiment, after the target pressure of each working point is calibrated by the fuel cell system, the self-regulating back pressure valves of different manufacturers, calibers and batches can be selected and switched at any time, and the valves do not need to be calibrated again independently, so that the system development efficiency is greatly improved, and the cost is low.
The communication power supply module of the back pressure valve controller is connected with the fuel cell system controller FCU for communication, the fuel cell system controller FCU controls the rotating speed of the air compressor to adjust the conveying quantity of the air compressor according to the signal sent by the flowmeter, the fuel cell system controller FCU sends a pressure value instruction to the communication power supply module according to the conveying quantity of the air compressor, and the communication power supply module sends the pressure value instruction to the operation control module;
The pressure sensor that the pressure acquisition module of backpressure valve controller connects sets up in the air inlet department of pile module, and pressure acquisition module passes through pressure sensor and gathers the pressure value of the air inlet department that gets into pile module, and pressure acquisition module sends the pressure value signal who gathers to operation control module.
The fuel cell system controller FCU sends a pressure value command to be P0, the pressure value at the air inlet of the electric pile module is P1, the operation control module performs comparison analysis according to the pressure value command sent by the fuel cell system controller FCU to be P0 and the pressure value at the air inlet of the electric pile module to be P1, after analysis and operation, the operation control module outputs a rotation command signal to the driving module, and the driving module drives the motor to control the opening of the valve core membrane, so that the opening of the back pressure valve body is adjusted.
When the pressure value at the air inlet of the electric pile module is P1 and the pressure value command sent by the fuel cell system controller FCU is P0 or more, the back pressure valve controller gives a driving motor rotation command, the motor controls the valve core diaphragm, the opening of the back pressure valve body is increased, meanwhile, the position acquisition module acquires the position of the valve core diaphragm, and the acquired position signal is fed back to the operation control module to ensure that the motor rotates normally;
When the pressure value at the air inlet of the galvanic pile module is P1 and the pressure value command sent by the fuel cell system controller FCU is less than 0, the back pressure valve controller gives a driving motor rotation command, the motor drives the valve core to rotate, the opening of the back pressure valve body is reduced, meanwhile, the position acquisition module acquires the position of the valve core membrane, and the acquired position signal is fed back to the operation control module to ensure that the motor rotates normally.
When the pressure value at the air inlet of the electric pile module is P1 minus the pressure value command sent by the fuel cell system controller FCU, and P0 is equal to 0, the opening degree of the back pressure valve body meets the requirement, the back pressure valve controller gives a command for stopping driving the motor until the next target pressure value sent by the fuel cell system controller FCU gives a new target pressure command.
Embodiment III:
As shown in fig. 5, a control method of a fuel cell system is characterized in that: the fuel cell system according to embodiment two, the control method includes the steps of:
Step 1: the pressure value at the air inlet of the input pile module is P1, and the fuel cell system controller FCU sends out a pressure value instruction to be P0;
Step 2: judging whether the pressure value at the air inlet of the electric pile module is P1 minus a pressure value instruction sent by the fuel cell system controller FCU is P0 which is more than 0; if the back pressure valve is in the open state, the back pressure valve controller gives out a rotation instruction of the driving motor, the motor controls the valve core diaphragm, the opening degree of the back pressure valve body is increased, meanwhile, the position acquisition module acquires the position of the valve core diaphragm, the acquired position signal is fed back to the operation control module, the motor is ensured to rotate normally, and then the step 3 is carried out; if not, the back pressure valve controller gives a driving motor rotation instruction, the motor controls the valve core diaphragm, the opening of the back pressure valve body is reduced, the position acquisition module acquires the position of the valve core diaphragm, the acquired position signal is fed back to the operation control module, the motor is ensured to rotate normally, and then the step 3 is carried out.
Step 3: judging whether the pressure value at the air inlet of the electric pile module is P1 minus a pressure value instruction sent by the fuel cell system controller FCU is P0 equal to 0 or not; if so, the back pressure valve controller gives a command for stopping the driving motor until a new target pressure command is given by a target pressure value sent by the fuel cell system controller FCU at the next time; if not, returning to the step 2.
The control method is simple and reliable, easy to realize, low in realization cost, capable of ensuring the pressure and flow requirements of the air circuit of the fuel cell system, enabling the fuel cell system to normally operate and saving energy.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited thereto, and any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention are included in the scope of the present invention.
Claims (7)
1. The fuel cell system comprises an air supply system, a cooling system, a hydrogen supply system, a pile module, a fuel cell system controller FCU and a self-regulating electronic back pressure valve, wherein the air supply system comprises an air filter, a flowmeter, an air compressor, an intercooler and a humidifier, external air sequentially passes through the air filter, the flowmeter, the air compressor, the intercooler and the humidifier and then is sent to an air inlet of the pile module, tail exhaust gas discharged from an air outlet of the pile module is humidified by the humidifier again, and is discharged after passing through the back pressure valve;
The back pressure valve is self-interacting electron back pressure valve, and self-interacting electron back pressure valve includes the back pressure valve body, and the back pressure valve body includes back pressure valve controller, motor, valve body and case diaphragm, and the case diaphragm is installed in the valve body the inside, opens or closes the back pressure valve body through opening and shutting of case diaphragm, wherein: the back pressure valve controller comprises a communication power supply module, a pressure acquisition module, a position acquisition module, a driving module and an operation control module; the motor is arranged on the valve body and used for controlling the opening of the valve core diaphragm; the pressure acquisition module is mainly used for acquiring pressure value signals of an external air flow channel and transmitting the acquired pressure value signals to the operation control module; the position acquisition module mainly acquires the stay position of the valve core diaphragm at any moment, is used as a reference for the rotation direction and angle of the driving motor, and feeds back the acquired position signal to the operation control module; the driving module is used for driving the motor to rotate forward or reversely and rotate by an angle, and controlling the opening of the valve core diaphragm so as to adjust the pressure value of an external air flow channel; the method is characterized in that:
The communication power supply module of the backpressure valve controller is connected with the fuel cell system controller FCU for communication, the fuel cell system controller FCU controls the rotating speed of the air compressor to adjust the conveying capacity of the air compressor according to the signal sent by the flowmeter, the fuel cell system controller FCU sends a pressure value instruction to the communication power supply module according to the conveying capacity of the air compressor, and the communication power supply module sends the pressure value instruction to the operation control module;
The pressure sensor connected with the pressure acquisition module of the backpressure valve controller is arranged at the air inlet of the pile module, the pressure acquisition module acquires a pressure value at the air inlet entering the pile module through the pressure sensor, and the pressure acquisition module sends the acquired pressure value signal to the operation control module;
The operation control module is used for receiving data output by the communication power supply module, the pressure acquisition module and the position acquisition module, comparing and analyzing a pressure value instruction sent by the fuel cell system controller FCU with a pressure value signal for acquiring an external air flow channel, outputting a rotation instruction signal to the driving module after analysis and operation, and driving the motor by the driving module to control the opening of the valve core diaphragm, so that the opening of the back pressure valve body is adjusted, and the pressure value of the external air flow channel is equal to the pressure value instruction sent by the fuel cell system controller FCU.
2. A fuel cell system according to claim 1, wherein: the pressure acquisition module is also connected with a pressure sensor, and the pressure sensor is arranged in the external air flow channel and acquires a pressure value signal of the external air flow channel.
3. A fuel cell system according to claim 1, wherein: the driving module comprises an electronic switching tube Q1, an electronic switching tube Q2, an electronic switching tube Q3 and an electronic switching tube Q4, wherein the electronic switching tube Q1 and the electronic switching tube Q2 form a first bridge arm, the electronic switching tube Q3 and the electronic switching tube Q4 form a second bridge arm, one wiring terminal A of the motor is electrically connected between the electronic switching tube Q1 and the electronic switching tube Q2, the other wiring terminal B of the motor is electrically connected between the electronic switching tube Q3 and the electronic switching tube Q4, and the control ends of the electronic switching tube Q1, the electronic switching tube Q2, the electronic switching tube Q3 and the electronic switching tube Q4 are electrically connected with the operation control module.
4. A fuel cell system according to claim 3, wherein: the motor is a stepper motor or a servo motor.
5. A fuel cell system according to claim 1 or 2 or 3 or 4, characterized in that: the operation control module is a singlechip MCU, and the electronic switch tube Q1, the electronic switch tube Q2, the electronic switch tube Q3 and the electronic switch tube Q4 adopt MOS tubes.
6. A fuel cell system according to claim 5, wherein: the fuel cell system controller FCU sends out a pressure value instruction of P0, the pressure value at the air inlet of the electric pile module is P1, the operation control module performs comparison analysis according to the pressure value instruction of P0 sent out by the fuel cell system controller FCU and the pressure value at the air inlet of the electric pile module is P1, after analysis and operation, the operation control module outputs a rotation instruction signal to the driving module, and the driving module drives the motor to control the opening of the valve core diaphragm, so that the opening of the back pressure valve body is adjusted;
When the pressure value at the air inlet of the electric pile module is P1 and the pressure value command sent by the fuel cell system controller FCU is P0 or more, the back pressure valve controller gives a driving motor rotation command, the motor controls the valve core diaphragm, the opening of the back pressure valve body is increased, meanwhile, the position acquisition module acquires the position of the valve core diaphragm, and the acquired position signal is fed back to the operation control module to ensure that the motor rotates normally;
when the pressure value at the air inlet of the galvanic pile module is P1 and the pressure value command sent by the fuel cell system controller FCU is less than 0, the back pressure valve controller gives a driving motor rotation command, the motor drives the valve core to rotate, the opening of the back pressure valve body is reduced, meanwhile, the position acquisition module acquires the position of the valve core diaphragm, and the acquired position signal is fed back to the operation control module to ensure that the motor rotates normally;
When the pressure value at the air inlet of the electric pile module is P1 minus the pressure value command sent by the fuel cell system controller FCU, and P0 is equal to 0, the opening degree of the back pressure valve body meets the requirement, the back pressure valve controller gives a command for stopping driving the motor until the next target pressure value sent by the fuel cell system controller FCU gives a new target pressure command.
7. A control method of a fuel cell system, characterized by: a fuel cell system according to any one of claims 1 to 6, the control method comprising the steps of:
Step 1: the pressure value at the air inlet of the input pile module is P1, and the fuel cell system controller FCU sends out a pressure value instruction to be P0;
Step 2: judging whether the pressure value at the air inlet of the electric pile module is P1 minus a pressure value instruction sent by the fuel cell system controller FCU is P0 which is more than 0; if the back pressure valve is in the open state, the back pressure valve controller gives out a rotation instruction of the driving motor, the motor controls the valve core diaphragm, the opening degree of the back pressure valve body is increased, meanwhile, the position acquisition module acquires the position of the valve core diaphragm, the acquired position signal is fed back to the operation control module, the motor is ensured to rotate normally, and then the step 3 is carried out; if not, the backpressure valve controller gives out a rotation instruction of the driving motor, the motor controls the valve core diaphragm, the opening of the backpressure valve body is reduced, meanwhile, the position acquisition module acquires the position of the valve core diaphragm, the acquired position signal is fed back to the operation control module, the motor is ensured to rotate normally, and then the step 3 is carried out;
Step 3: judging whether the pressure value at the air inlet of the electric pile module is P1 minus a pressure value instruction sent by the fuel cell system controller FCU is P0 equal to 0 or not; if so, the back pressure valve controller gives a command for stopping the driving motor until a new target pressure command is given by a target pressure value sent by the fuel cell system controller FCU at the next time; if not, returning to the step 2.
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| JP2006092855A (en) * | 2004-09-22 | 2006-04-06 | Chino Corp | Back pressure valve controller for fuel cell |
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| JP2006092855A (en) * | 2004-09-22 | 2006-04-06 | Chino Corp | Back pressure valve controller for fuel cell |
| CN203147014U (en) * | 2012-12-17 | 2013-08-21 | 卓旦春 | Intelligent valve |
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