CN113991148A - Water management system of variable-vibration fuel cell and control method thereof - Google Patents
Water management system of variable-vibration fuel cell and control method thereof Download PDFInfo
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- CN113991148A CN113991148A CN202111198146.8A CN202111198146A CN113991148A CN 113991148 A CN113991148 A CN 113991148A CN 202111198146 A CN202111198146 A CN 202111198146A CN 113991148 A CN113991148 A CN 113991148A
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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
- H01M8/04291—Arrangements for managing water in solid electrolyte fuel cell systems
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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 water management system of a variable vibration fuel cell and a control method thereof. The fuel cell stack vibration control device comprises a vibration changing device and a fuzzy controller, wherein the vibration changing device comprises a plurality of spring lifting tables with electric damping springs, a vibrator lifting table with a vibrator and a placing seat positioned above the spring lifting tables and the vibrator lifting tables, the fuel cell stack is positioned and installed on the placing seat through a positioning piece, the electric damping springs are connected with the fuzzy controller through damping spring control wiring harnesses, the vibrator is also connected with the fuzzy controller through the vibrator control wiring harnesses, and the fuzzy controller can control the vibrator to vibrate and enable the fuel cell stack to lift through controlling the electric damping springs to act. The beneficial effects are that: the fuel cell stack vibration control device is ingenious in structural design and reasonable in control method, effectively solves the problem that the fuel cell vibrates under the complex road conditions to cause flooding inside the fuel cell stack, ensures the stability of the fuel cell in vibration under the complex road conditions, and also improves the performance of the fuel cell.
Description
Technical Field
The invention relates to a water management system of a variable vibration fuel cell and a control method thereof, belonging to the technical field of water management of fuel cells.
Background
With increasing environmental awareness, gasoline and diesel vehicles will face more and more challenges in the future market, and Proton Exchange Membrane Fuel Cell (PEMFC) vehicles are one of the most promising alternatives, however, excessive product water may cause severe flooding of the cathode side, and when water fills the pores of the Gas Diffusion Layer (GDL), the oxygen transmission path from the channels to the catalyst layer will be blocked, and thus, effective management of product water is one of the important technical issues for improving the performance of the fuel cell stack.
When the fuel cell stack runs on a complex road condition, product water in the fuel cell stack cannot be timely removed and accumulated in the stack due to vibration, so that a water flooding phenomenon is generated, researches show that mechanical vibration can directly influence water removal of a GDL (gas diffusion layer) and a flow channel, so that the risk of internal water flooding is reduced or increased, however, the existing damping device has the defect of fixed damping capacity and does not consider the problem of water removal caused by mechanical vibration of water flooding in a horizontal road section.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a variable-vibration fuel cell water management system and a control method thereof, wherein the variable-vibration fuel cell water management system controls the water distribution in a fuel cell stack by controlling the vibration frequency of the fuel cell stack so as to effectively manage the fuel cell stack, avoid the flooding phenomenon and improve the effective output of the fuel cell stack.
In order to solve the technical problem, the vibration varying fuel cell water management system comprises a vibration varying device and a fuzzy controller, wherein the vibration varying device is used for arranging a fuel cell stack, the fuzzy controller is used for controlling the vibration varying device, the vibration varying device comprises a plurality of damper lifting tables with electric control dampers, a vibrator lifting table with a vibrator and a setting seat, the setting seat is positioned above the damper lifting tables and the vibrator lifting tables, the fuel cell stack is positioned on the setting seat through a positioning piece, the electric control dampers are connected with the fuzzy controller through damping spring control wiring harnesses, the vibrator is also connected with the fuzzy controller through the vibrator control wiring harnesses, and the fuzzy controller can control the vibrator to vibrate and enable the fuel cell stack to lift through controlling the electric control dampers to act.
The surface of the fuel cell stack is provided with a vibration sensor, and the vibration sensor is connected with the fuzzy controller through a vibration sensor control wire harness, so that the vibration frequency of the fuel cell stack can be sent to the fuzzy controller.
A flow sensor is arranged at an inlet of a fuel cell water tank of the fuel cell stack, and the flow sensor is connected with the fuzzy controller through a flow sensor control wire harness and can send the flow of liquid water discharged by the fuel cell stack to the fuzzy controller.
The vibration changing device comprises four damper lifting tables with electric control dampers, wherein the vibrator lifting tables are arranged at the center of the lower part of the placing seat, and the four damper lifting tables are arranged around the vibrator lifting tables.
A control method of the water management system of the variable vibration fuel cell based on the fuzzy control,
the fuzzy controller judges the possibility of flooding the fuel cell stack by combining the vibration frequency of the fuel cell stack provided by the vibration sensor and the flow data of liquid water discharged by the fuel cell stack provided by the flow sensor at the inlet of the water tank of the fuel cell, and if the possibility exists, the fuzzy controller is divided into the following two processing modes:
A. when the vibration frequency exceeds a set value, the fuzzy controller controls the electric control damper to change the damping along with the change of the vibration frequency;
B. when the vibration frequency is smaller than the set value, the fuzzy controller controls the vibrator to vibrate so that the vibration frequency of the fuel cell stack is increased, and the vibrator is closed after liquid water is discharged.
Compared with the prior art, the invention has the following beneficial effects:
(1) the frequency of controlling the vibration of the fuel cell stack controls the water distribution in the stack so as to effectively manage the water of the fuel cell stack, avoid flooding and ensure the normal operation of the fuel cell stack.
(2) The whole system is controlled by adopting a fuzzy control method, can quickly respond according to the monitored data, does not need to depend on an accurate mathematical model, and has better adaptability and fault tolerance;
(3) the water flooding phenomenon generated in the stable operation can be subjected to vibration treatment, and the water in the fuel cell stack is timely discharged through proper vibration frequency, so that the fuel cell stack can be favorably kept at high-efficiency performance.
(4) The fuel cell stack vibration control device is ingenious in structural design and reasonable in control method, effectively solves the problem that the fuel cell vibrates under the complex road conditions to cause flooding inside the fuel cell stack, ensures the stability of the fuel cell in vibration under the complex road conditions, and also improves the performance of the fuel cell.
Drawings
FIG. 1 is a schematic view of the structure of the vibration device of the present invention;
FIG. 2 is a control schematic diagram of the present invention;
FIG. 3 is a table of fuzzy control rules in the present invention;
fig. 4 is a control flow chart in the present invention.
Wherein: 1-vibration changing device, 2-electric control damper, 3-damper lifting table, 4-vibrator, 5-vibrator lifting table, 6-bottom plate, 7-fuel cell stack, 8-flow sensor control wire harness, 9-flow sensor, 10-controller power supply, 11-fuzzy controller, 12-electric control damper control wire harness, 13-vibrator control wire harness, 14-motor control wire harness, 15 motor, 16-power supply, 17-vibration sensor, 18-vibration sensor control wire harness, 19-positioning block and 20-fastening piece.
Detailed Description
The fuzzy control-based water management system for a variable vibration fuel cell and the control method thereof according to the present invention will be described in further detail with reference to the accompanying drawings and the following detailed description.
The first embodiment is as follows:
as shown in the figure, the variable vibration fuel cell water management system based on fuzzy control of the invention is used for preventing and controlling flooding of a fuel cell under various complex road conditions to manage water and ensure the normal working and operation of the fuel cell, and comprises a variable vibration device 1 for arranging a fuel cell stack 7 and a fuzzy controller 11 for controlling the variable vibration device 1, wherein the variable vibration device 1 comprises four damper lifting platforms 3, a vibrator lifting platform 5, a placing seat for arranging the fuel cell stack 7 and a bottom plate 6, as can be seen from the figure, each damper lifting platform 3 is provided with an electric control damper 2, the vibrator lifting platform 5 is provided with a vibrator 4, the damper lifting platform 3 and the vibrator lifting platform 5 are both arranged on the bottom plate 6, the top end of the damper lifting platform 3 is arranged at the bottom of the placing seat, the vibrator lifting platform 5 is arranged below the placing seat, the fuel cell stack 7 is positioned and installed at the right middle position of the placement seat through four positioning pieces (positioning blocks) 19 and fixed through a fastener 20, a vibration sensor 17 is arranged on the surface of the fuel cell stack 7, the vibration sensor 17 is connected with the fuzzy controller 11 through a vibration sensor control wiring harness 18 so as to send the vibration frequency of the fuel cell stack to the fuzzy controller, a flow sensor 9 is arranged at an inlet of a fuel cell water tank of the fuel cell stack 7, the flow sensor 9 is connected with the fuzzy controller 11 through a flow sensor control wiring harness 8 and can send the flow of liquid water discharged by the fuel cell stack 7 to the fuzzy controller, in addition, the electric control damper is connected with the fuzzy controller 11 through an electric control damper control wiring harness 12, and the change of the damping size is realized through the fuzzy controller; the vibrator 4 is also connected with the fuzzy controller 11 through a vibrator control wire harness 13, so that a shock absorption system is formed by the vibration sensor 17, the electric control damper 2, the damper lifting table 3, the electric control damper control wire harness 12 and the fuzzy controller 11, a vibration system is formed by the vibrator 4, the vibrator lifting table 5, the vibrator controller wire harness 13, the motor 15 and the fuzzy controller 11, and the fuzzy controller 11 can control the vibrator 4 to vibrate and control the electric control damper 2 to move to enable the damper lifting table 3 and the vibrator lifting table 5 to lift so as to drive the fuel cell stack 7 to lift.
Further, the vibrator elevation stage 5 is disposed at the bottom center of the seating base and the base plate and four damper elevation stages are disposed around the vibrator elevation stage, thereby optimizing the stability thereof, and in addition, power supply lines for supplying the four damper elevation stages and the vibrator elevation stage and the vibrator are integrated in the base plate, the four damper elevation stages and the vibrator elevation stage and the vibrator are connected to a power supply 16 through the power supply lines, the damper elevation stage 3, the vibrator elevation stage 5 and the vibrator 4 are connected to a motor 15 for supplying vibration power to the vibrator, the motor is connected to a fuzzy controller 11 through a motor control harness 14 and a vibrator control harness 13, and the fuzzy controller 11 is further connected to a controller power supply 10.
Example two:
the control method of the water management system of the variable vibration fuel cell based on the fuzzy control of the embodiment,
the fuzzy controller judges the possibility of flooding the fuel cell stack by combining the vibration frequency of the fuel cell stack provided by the vibration sensor and the flow data of liquid water discharged by the fuel cell stack provided by the flow sensor at the inlet of the water tank of the fuel cell, and if the possibility exists, the fuzzy controller is divided into the following two processing modes:
A. when the vibration frequency exceeds the vibration frequency of the optimal operation road condition of the fuel cell stack obtained by experiments, the fuzzy controller controls the electric control damper to change the damping along with the change of the vibration frequency;
B. when the vibration frequency is lower than the vibration frequency of the best running road condition of the fuel cell stack obtained through experiments, the fuzzy controller controls the vibrator to vibrate so that the vibration frequency of the fuel cell stack is increased, and the vibrator is closed after liquid water is discharged.
The specific method is described in detail with reference to fig. 3:
the fuzzy control takes the vibration frequency change X monitored by the vibration sensor 17 and the water discharge flow Y of the fuel cell stack 7 as observed quantities, takes the water flooding possibility U of the fuel cell stack 7 as an output quantity, and takes the vibration frequency or the damping magnitude of the vibration-variable device 1 as a control quantity;
the observations X of the fuzzy control are divided into 3 fuzzy sets: small vibration S1, constant vibration Z1, large vibration L1; the observations Y are divided into 3 fuzzy sets: small flow S2, normal flow M1, large flow L2; the vibration frequency of the fuel cell stack under the optimal operating road condition can be experimentally measured and is set as [ a, b ]. A is less than X; when a is more than X and less than b, the normal shock is generated; when X is larger than b, the vibration is large, and the normal drainage flow of the fuel cell stack can be measured and is set as [ c, d ]. Y is less than c, and the flow is small; c, Y and d are constant flows; y is larger than d and is large flow.
The fuzzy rule of the fuzzy control algorithm is as follows:
(1) if X is S1 and Y is S2, then U is large (L);
(2) if X is S1 and Y is Z2, then U is 0 (Z);
(3) if X is S1 and Y is L2, then U is medium (M);
(4) if X is Z1 and Y is S2, then U is large (L);
(5) if X is Z1 and Y is Z2, then U is 0 (Z);
(6) if X is Z1 and Y is L2, then U is medium (M);
(7) if X is L1 and Y is S2, then U is large (L);
(8) if X is L1 and Y is Z2, then U is medium (M);
(9) if X is L1 and Y is L2, then U is large (L);
under the initial working condition, the vibrator lifting platform 5 is in a descending state, and the vibrator 4 does not work and is not in contact with the placing seat; the damper lifting platform 3 is in a lifting state, the electronic control damper 2 is in a normal damping state, after the possibility of flooding inside the fuel cell stack 7 is judged, if the internal flooding possibility is judged under fuzzy rules (1), (3), (4) and (6), the vibrator lifting platform is lifted, after the lifting is finished, the electronic control damper lifting platform is lowered, the vibrator starts to vibrate to discharge water gathered inside the fuel cell stack, and if the internal flooding possibility is judged under the fuzzy rules (7), (8) and (9), the supply current of the electronic control damper is increased until the vibration frequency data provided by the vibration sensor of the fuel cell stack reaches the frequency of normal vibration.
The detailed execution steps are as follows:
the method comprises the following steps: according to the vibration data of the fuel cell stack 7 provided by the vibration sensor 17, if X is small vibration S1 or normal vibration Z1, then the data Y provided by the flow sensor 9 is small flow S2, then step two is executed; if X is large vibration L1 and Y is small flow S2, executing step three;
step two: raising the vibrator lifting table 5 until the vibrator 4 supports a placing seat of the vibration changing device, lowering the damper lifting table 3, and controlling the vibrator 4 to start vibrating by the fuzzy controller 11 so that the vibration of the fuel cell stack 7 is in the optimal drainage frequency until the drainage flow at the flow sensor 9 is in the normal flow, and executing the step four;
step three: if the damper lifting platform 3 is in a lifting state at this time, the fuzzy controller 11 controls the input current of the electric control damper 2 to change until the vibration frequency of the fuel cell stack 7 is in the optimal drainage frequency, and when the flow rate of the drainage water at the flow sensor 9 is in a normal flow rate, the fourth step is executed; if the damper lifting platform 3 is in a descending state at the moment, the fuzzy controller 11 controls the damper lifting platform 3 to ascend, and when the electronic control damper 2 supports the placing seat of the vibration transformation device, the vibrator lifting platform 5 descends; executing a step four after executing the current change operation;
step four: when the damper lifting platform 3 is in a rising state and the vibrator lifting platform 5 is in a falling state, restoring the current of the original electric control damper 2 until the fuzzy controller 11 judges the possibility of the fuel cell pile 7 being flooded again and executes the step one; and (3) when the damper lifting platform 3 is in a descending state and the vibrator lifting platform 5 is in an ascending state, the fuzzy controller 11 controls the damper lifting platform 3 to ascend to a placing seat of the electric control damper 2 for supporting the vibration changing device, and then the vibrator lifting platform 5 is descended until the next time the fuzzy controller 11 judges the possibility of flooding of the fuel cell stack 7, and the step one is executed again.
Claims (5)
1. A fuzzy control based variable vibration fuel cell water management system, characterized by: comprises a vibration-varying device (1) for arranging a fuel cell stack (7) and a fuzzy controller (11) for controlling the vibration-varying device (1), the vibration-varying device (1) comprises a plurality of spring lifting platforms (3) with electric damping springs (2), a vibrator lifting platform (5) with a vibrator (4) and a setting seat positioned above the spring lifting platforms and the vibrator lifting platforms, the fuel cell stack (7) is positioned and installed on the installation seat through a positioning piece (19), the electric damping spring is connected with the fuzzy controller (11) through a damping spring control wire harness (12), the vibrator (4) is also connected with the fuzzy controller (11) through a vibrator control wire harness (13), the fuzzy controller (11) can control the vibrator (4) to vibrate and control the electric damping spring (2) to move to lift the fuel cell stack (7).
2. The fuzzy control-based variable vibration fuel cell water management system of claim 1 wherein: the surface of the fuel cell stack (7) is provided with a vibration sensor (17), and the vibration sensor (17) is connected with the fuzzy controller (11) through a vibration sensor control wiring harness (18) so as to send the vibration frequency of the fuel cell stack to the fuzzy controller.
3. The fuzzy control-based variable vibration fuel cell water management system according to claim 1 or 2, wherein: a flow sensor (9) is arranged at an inlet of a fuel cell water tank of the fuel cell stack (7), and the flow sensor (9) is connected with a fuzzy controller (11) through a flow sensor control wire harness (8) and can send the flow of liquid water discharged by the fuel cell stack (7) to the fuzzy controller.
4. The fuzzy control-based variable vibration fuel cell water management system of claim 3 wherein: the vibration changing device (1) comprises four spring lifting tables (3) with electric damping springs (2), and the vibrator lifting table (5) is arranged at the center of the lower portion of the placement seat and enables the four spring lifting tables to be arranged on the periphery of the vibrator lifting table.
5. A control method of a fuzzy controlled water management system for a variable vibration fuel cell according to any one of claims 1 to 4, wherein:
the fuzzy controller judges the possibility of flooding the fuel cell stack by combining the vibration frequency of the fuel cell stack provided by the vibration sensor and the flow data of liquid water discharged by the fuel cell stack provided by the flow sensor at the inlet of the water tank of the fuel cell, and if the possibility exists, the fuzzy controller is divided into the following two processing modes:
A. when the vibration frequency exceeds a set value, the fuzzy controller controls the electric damping spring to change the damping along with the change of the vibration frequency;
B. when the vibration frequency is smaller than the set value, the fuzzy controller controls the vibrator to vibrate so that the vibration frequency of the fuel cell stack is increased, and the vibrator is closed after liquid water is discharged.
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Cited By (1)
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| CN115447405A (en) * | 2022-10-17 | 2022-12-09 | 质子汽车科技有限公司 | Hydrogen fuel cell stack mounting structure for vehicle |
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