Control system of high-power hydrogen fuel cell

Abstract

The invention relates to the technical field of new energy automobiles, and discloses a control system of a high-power hydrogen fuel cell, which comprises a box body and a circuit control system in the box body, and the circuit control system comprises an ECU module, a fuel cell DC / DC module, a filtering and discharging circuit, an EIS module, an air compressor control module, a hydrogen circulating pump control module, a step-down DC / DC module, an HV-PDU module and an LV-PDU module. The circuit control system is electrically connected with a plurality of electrical connection interfaces arranged on the box body. The system simplifies pipeline connection, and is high in integration level, diversified in function, convenient to use and high in compatibility.

Description

Technical Field

[0001] The present application relates to the field of new energy vehicle technology, and specifically to a control system for a high-power hydrogen fuel cell. Background Art

[0002] Under the guidance of the national policy of vigorously promoting the development of the hydrogen energy industry, hydrogen fuel cell technology is becoming more and more mature, and the demonstration operation of hydrogen fuel cell vehicles has achieved remarkable results, and is rapidly moving towards industrialization. Long-distance highway buses, heavy trucks, mining cars and ships are the main application scenarios of hydrogen fuel cells in the next few years. Hydrogen fuel cells are developing in the direction of high power and high integration. The main electrical components of the hydrogen fuel cell system include fuel cell controllers, high-voltage distribution boxes, low-voltage distribution boxes, air compressor controllers, hydrogen circulation pump controllers, fuel cell DC / DC converters, step-down DC / DC converters, etc., which have been verified by the market and are mature and stable, but there is still a lack of highly integrated solutions.

[0003] Problems and shortcomings: 1) The integrated design of hydrogen fuel cell systems is difficult, takes up space, has complex pipeline connections, and is difficult to assemble and maintain; 2) There are multiple independent housings, multiple control boards, and electrical components are connected by a large number of pipelines, which is costly; 3) It is inconvenient for customers to use, and they need to select and match multiple electrical components; 4) Not conducive to electromagnetic compatibility design; 5) The function is single, does not meet user needs, and lacks functions such as harmonic detection and input voltage clamping; 6) The system platform has poor versatility and compatibility. Summary of the invention

[0004] The purpose of the present application is to provide a high-power hydrogen fuel cell control system with simplified pipeline connection, high integration, diverse functions, easy use and strong compatibility.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A control system of a high-power hydrogen fuel cell of the present invention comprises a box body, in which a circuit control system is arranged, and the circuit control system comprises: an HV-PDU module, which is used for high-voltage power distribution, high-voltage pre-charging and overload short-circuit protection of the fuel cell system, and the HV-PDU module is electrically connected to the HV_CON5 water pump / PTC power supply interface and the HV_CON6 high-voltage fan power supply interface arranged on the box body respectively; LV-PDU module, used for low-voltage power supply filtering, control distribution and overload short-circuit protection of the fuel cell system, the LV-PDU module is electrically connected to the LV_CON7 controller power negative input interface, the LV_CON6 controller power positive input interface, the LV_CON9 low-voltage power supply output interface and the LV_CON8 system low-voltage negative interface provided on the box body; A filter module is used for filtering the high-voltage input and output ports, and the filter module is electrically connected to the input copper bus connector, the HV_CON1 high-voltage output positive electrode interface, and the HV_CON2 high-voltage output negative electrode interface provided on the box body respectively; Discharge module, used for discharging residual voltage of high voltage input and output circuits; EIS module, used for AC harmonic detection; An air compressor control module, used for starting and stopping the air compressor, speed control and fault diagnosis, the air compressor control module is electrically connected to the HV_CON3 air compressor power supply interface provided on the box; Fuel cell DC / DC module, used for voltage conversion between fuel cell stack and power battery; A hydrogen circulation pump control module is used for starting and stopping, controlling and diagnosing faults of the hydrogen circulation pump. The hydrogen circulation pump control module is electrically connected to the HV_CON4 hydrogen circulation pump power supply interface provided on the box; A step-down DC / DC module is used to supply power to the heat dissipation system and the low-pressure fan of the battery stack after voltage conversion. The step-down DC / DC module is electrically connected to the LV_CON2 low-pressure fan negative power supply interface and the LV_CON1 low-pressure fan positive power supply interface provided on the box body respectively; ECU module, used for central control processing and fault diagnosis, the ECU module is electrically connected to the LV_CON3 & LV_CON4 fuel cell system low-voltage communication interface and the LV_CON5 vehicle low-voltage communication interface provided on the box body; The ECU module is electrically connected to the HV-PDU module, LV-PDU module, filter module, discharge module, EIS module, air compressor control module, fuel cell DC / DC module, hydrogen circulation pump control module and step-down DC / DC module respectively, and the HV-PDU module is electrically connected to the filter module, discharge module, air compressor control module, hydrogen circulation pump control module and step-down DC / DC module respectively.

[0006] Furthermore, the input end of the HV-PDU module is electrically connected to the discharge module, the output end of the HV-PDU module is electrically connected to the filter module, and the HV-PDU module includes a plurality of positive fuses respectively used for overload and short-circuit protection of the air compressor control module, the hydrogen circulation pump control module, the water pump, the PTC, the high-pressure fan, and the step-down DC / DC module, as well as a positive relay and a negative relay respectively connected to the positive and negative poles of the high-voltage line, and the positive relay is connected in parallel with a pre-charge relay.

[0007] Furthermore, the filtering module includes an input filtering circuit and an output filtering circuit, both of which are electrically connected to the ECU module, the input filtering circuit is arranged at the input end of the high-voltage circuit and is connected to the discharge module, and the output filtering circuit is arranged at the output end of the high-voltage circuit and is electrically connected to the HV-PDU module.

[0008] Furthermore, the discharge module includes a discharge path one and a discharge path two, both of which are electrically connected to the ECU module, the discharge path one is electrically connected to the input filter circuit and the EIS module respectively, and the discharge path two is electrically connected to the fuel cell DC / DC module and the HV-PDU module respectively.

[0009] Furthermore, the LV-PDU module includes a common-mode inductor electrically connected to the LV_CON7 controller power negative input interface, the LV_CON6 controller power positive input interface and the LV_CON8 system low-voltage negative interface respectively, the common-mode inductor is used for inputting normal power filtering and improving EMC performance, the common-mode inductor is connected to a subsystem control relay for controlling the power supply of the fuel cell subsystem, the subsystem control relay is electrically connected to the LV_CON9 low-voltage power supply output interface, the subsystem control relay is connected to a hydrogen tail exhaust valve body control relay and a plurality of stack end plate control relays, the plurality of stack end plate control relays respectively control the power supply of each stack end plate heating film, the hydrogen tail exhaust valve body control relay controls the power supply of the hydrogen tail exhaust valve body heating film, the hydrogen tail exhaust valve body control relay and the plurality of stack end plate control relays are all electrically connected to the LV_CON9 low-voltage power supply output interface, the common-mode inductor, the subsystem control relay, the hydrogen tail exhaust valve body control relay and the plurality of stack end plate control relays are all electrically connected to the ECU module.

[0010] Furthermore, a water cooling plate for dissipating heat for the circuit control system is provided on the box body, and the water cooling plate is respectively connected to a water cooling inlet joint and a water cooling outlet joint provided on the box body.

[0011] Compared with the prior art, the beneficial effects of this application are: (1) It integrates ECU module, fuel cell DC / DC module, EIS module, air compressor control module, hydrogen circulation pump control module, step-down DC / DC module, HV-PDU module, LV-PDU module, filter module and discharge module, with high integration and powerful functions; (2) After integration, a large number of wiring harnesses, pipe connections and multiple shells are eliminated, which occupies a small space, is lightweight, improves power density, simplifies assembly and reduces costs; (3) The locations of water circuits and electrical interfaces are arranged according to the actual application scenarios, which are relatively concentrated and reasonably distributed. The wiring harness is simple and easy to use and maintain. (4) The control unit is deeply integrated and centrally controlled by the ECU module, which reduces costs and facilitates maintenance; (5) It integrates the step-down DC / DC module and the high-voltage fan power distribution unit, and is compatible with the power supply requirements of the low-voltage fan and the high-voltage fan of the cooling system; (6) With AC disturbance injection and harmonic detection functions, the ECU module can perform deep water and heat management adjustment through AC impedance parameters to improve the performance and life of the fuel cell stack; (7) The fuel cell DC / DC module controls the input constant voltage to perform fuel cell stack on / off voltage clamping and cold start, thus avoiding catalyst corrosion and increasing the service life of the fuel cell stack; (8) The fuel cell DC / DC module is compatible with all high-power fuel cell products and has high versatility; (9) High-voltage and low-voltage port filter circuit design, excellent electromagnetic compatibility performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the drawings required for use in the implementation methods will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a circuit structure principle block diagram of the circuit control system of the present application; Figure 2 It is a schematic diagram of the circuit principle of the HV-PDU module of the present application; Figure 3 It is a schematic diagram of the circuit principle of the LV-PDU module of the present application; Figure 4 It is a schematic diagram of the overall structure of this application; Figure 5 It is a bottom view of the overall structural schematic diagram of the present application.

[0014] Figure numerals: box (1); water cooling plate (2); input copper busbar connection port (3); water cooling inlet connector (4); water cooling outlet connector (5); HV_CON3 air compressor power supply interface (6); HV_CON5 water pump / PTC power supply interface (7); HV_CON6 high-pressure fan power supply interface (8); HV_CON1 high-pressure output positive electrode interface (9); HV_CON2 high-pressure output negative electrode interface (10); HV_CON4 hydrogen circulation pump power supply interface (11); LV_CON5 vehicle low LV_CON3 & LV_CON4 fuel cell system low-voltage communication interface (13, 14); LV_CON7 controller power negative input interface (15); LV_CON6 controller power positive input interface (16); LV_CON2 low-pressure fan negative power supply interface (17); LV_CON1 low-pressure fan positive power supply interface (18); LV_CON9 low-voltage power supply output interface (19); LV_CON8 system low-voltage negative interface (20). DETAILED DESCRIPTION

[0015] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0016] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show the layers related to the present invention rather than being drawn according to the number, shape and size of the layers in actual implementation. In actual implementation, the type, quantity and proportion of each layer may be changed arbitrarily, and the layer layout may also be more complicated.

[0017] In the following description, numerous details are discussed to provide a more thorough explanation of embodiments of the present invention; however, it is apparent to one skilled in the art that embodiments of the present invention may be practiced without these specific details.

[0018] See also Figures 1 to 5A control system for a high-power hydrogen fuel cell, comprising a housing (1), wherein a circuit control system is arranged in the housing (1), wherein the circuit control system comprises: an HV-PDU module, which is used for high-voltage power distribution, high-voltage pre-charging and overload short-circuit protection of the fuel cell system, wherein the HV-PDU module is electrically connected to an HV_CON5 water pump / PTC power supply interface (7) and an HV_CON6 high-voltage fan power supply interface (8) arranged on the housing (1); An LV-PDU module is used for low-voltage power supply filtering, control distribution and overload short-circuit protection of the fuel cell system, and the LV-PDU module is electrically connected to the LV_CON7 controller power supply negative input interface (15), the LV_CON6 controller power supply positive input interface (16), the LV_CON9 low-voltage power supply output interface (19) and the LV_CON8 system low-voltage negative interface (20) respectively provided on the box (1); A filter module, used for filtering high-voltage input and output ports, the filter module being electrically connected to an input copper busbar connector (3), an HV_CON1 high-voltage output positive electrode connector (9), and an HV_CON2 high-voltage output negative electrode connector (10) provided on the housing (1); Discharge module, used for discharging residual voltage of high voltage input and output circuits; EIS module, used for AC harmonic detection; An air compressor control module, used for starting and stopping the air compressor, speed control and fault diagnosis, the air compressor control module being electrically connected to an HV_CON3 air compressor power supply interface (6) provided on the housing (1); Fuel cell DC / DC module, used for voltage conversion between fuel cell stack and power battery; A hydrogen circulation pump control module, used for starting and stopping, controlling and diagnosing faults of the hydrogen circulation pump, the hydrogen circulation pump control module being electrically connected to an HV_CON4 hydrogen circulation pump power supply interface (11) provided on the box (1); A step-down DC / DC module, used to supply power to the heat dissipation system and the low-pressure fan of the battery stack after voltage conversion, the step-down DC / DC module being electrically connected to the LV_CON2 low-pressure fan negative power supply interface (17) and the LV_CON1 low-pressure fan positive power supply interface (18) provided on the box (1) respectively; An ECU module, used for central control processing and fault diagnosis, the ECU module being electrically connected to LV_CON3 & LV_CON4 fuel cell system low-voltage communication interfaces (13, 14) and LV_CON5 vehicle low-voltage communication interface (12) respectively provided on the box (1); The ECU module is electrically connected to the HV-PDU module, LV-PDU module, filter module, discharge module, EIS module, air compressor control module, fuel cell DC / DC module, hydrogen circulation pump control module and step-down DC / DC module respectively, and the HV-PDU module is electrically connected to the filter module, discharge module, air compressor control module, hydrogen circulation pump control module and step-down DC / DC module respectively.

[0019] See also Figure 2 The input end of the HV-PDU module is electrically connected to the discharge module, the output end of the HV-PDU module is electrically connected to the filter module, and the HV-PDU module includes a plurality of positive fuses for overload and short circuit protection of the air compressor control module, the hydrogen circulation pump control module, the water pump, the PTC, the high-pressure fan, and the step-down DC / DC module, as well as a positive relay and a negative relay respectively connected to the positive and negative electrodes of the high-voltage line, and the positive relay is connected in parallel with a pre-charge relay.

[0020] See also Figure 2 , HV-PDU module, one is used for power distribution and overload short circuit protection, as follows: positive fuse F1 is used for air compressor control module overload short circuit protection, positive fuse F2 is used for hydrogen circulation pump control module overload short circuit protection, positive fuse F3 is used for water pump overload short circuit protection, positive fuse F4 is used for PTC overload short circuit protection, positive fuse F5 is used for high-voltage fan overload short circuit protection, positive fuse F6 is used for step-down DC / DC module overload short circuit protection; the other is used for the battery high voltage circuit on and off and Pre-charging, the specific implementation process is as follows: the ECU module executes the high-voltage power-on process, and at the same time detects that the high voltage at the lithium battery end is normal, controls the closing of the negative relay S5, and then closes the pre-charging relay S3. After judging that the pre-charging is completed, closes the positive relay S4, and then disconnects the pre-charging relay S3. At this point, the high-voltage power-on process is completed; the ECU module executes the high-voltage power-off process, controls the disconnection of the positive relay S4, and then disconnects the negative relay S5. After the high-voltage circuit voltage of the controller is discharged to a safe voltage, the high-voltage power-off process is completed.

[0021] See also Figure 2 The filter module includes an input filter circuit and an output filter circuit, both of which are electrically connected to the ECU module. The input filter circuit is arranged at the input end of the high-voltage circuit and is connected to the discharge module. The output filter circuit is arranged at the output end of the high-voltage circuit and is electrically connected to the HV-PDU module.

[0022] See also Figure 2The input filter circuit is used to filter the harmonic components of the high-voltage input end and reduce the voltage and current ripples; the output filter circuit is used to filter the harmonic components of the high-voltage output end and reduce the voltage and current ripples. The filter circuit can effectively improve the electromagnetic compatibility performance of the controller.

[0023] See also Figure 2 The discharge module includes a discharge path one and a discharge path two, both of which are electrically connected to the ECU module, the discharge path one is electrically connected to the input filter circuit and the EIS module respectively, and the discharge path two is electrically connected to the fuel cell DC / DC module and the HV-PDU module respectively.

[0024] See also Figure 2 The specific discharge process of the discharge path is as follows: when the battery stack is shut down or shuts down abnormally, the ECU module controls the closing relay S1 to discharge the residual voltage of the battery stack through the discharge resistor R1. After the voltage is discharged to a safe level, the relay S1 is disconnected; The discharge process of the second discharge path is specifically as follows: when the ECU module executes the high-voltage discharge process, the ECU module controls the closing of relay S2 to discharge the residual voltage of the battery stack through the discharge resistor R2. After discharging to a safe voltage, the relay S2 is disconnected.

[0025] See also Figure 3 and Figure 4 , Figure 5 The LV-PDU module includes a common-mode inductor electrically connected to the LV_CON7 controller power negative input interface (15), the LV_CON6 controller power positive input interface (16) and the LV_CON8 system low-voltage negative interface (20), respectively. The common-mode inductor is used for inputting normal power supply filtering and improving EMC performance. The common-mode inductor is connected to a subsystem control relay for controlling the power supply of the fuel cell subsystem. The subsystem control relay is electrically connected to the LV_CON9 low-voltage power supply output interface (19). The system control relay is connected to a hydrogen tail exhaust valve body control relay and a plurality of stack end plate control relays, and the plurality of stack end plate control relays respectively control the power supply of each stack end plate heating film, and the hydrogen tail exhaust valve body control relay controls the power supply of the hydrogen tail exhaust valve body heating film, and the hydrogen tail exhaust valve body control relay and the plurality of stack end plate control relays are all electrically connected to the LV_CON9 low-voltage power supply output interface (19), and the common mode inductor, the subsystem control relay, the hydrogen tail exhaust valve body control relay and the plurality of stack end plate control relays are all electrically connected to the ECU module.

[0026] In this embodiment, please refer to Figure 3 and Figure 4 , Figure 5, the LV-PDU module includes subsystem control relay Relay6, hydrogen tail exhaust valve body control relay Relay5, stack end plate control relay Relay1-Relay4, self-recovery fuse f1-f13, voltage regulator diode D1, anti-reverse connection diode D2, and L1 is a common mode inductor; The LV-PDU module is used for low-voltage power distribution, load overload short-circuit protection, input power filtering, input power voltage stabilization and anti-reverse connection protection. The following is a brief description of the LV-PDU workflow: The LV_CON6 controller power positive input interface (16) is connected to the vehicle's normal power positive pole, the LV_CON7 controller power negative input interface (15) is connected to the vehicle's normal power negative pole, the LV_CON8 system low-voltage negative interface (20) is connected to the fuel cell subsystem load negative pole, and the LV_CON9 low-voltage power supply output interface (19) is connected to the fuel cell subsystem load positive pole; the common-mode inductor L1 is used for input normal power filtering to improve EMC performance; the voltage regulator diode D1 is used for input normal power voltage stabilization and absorption Surge voltage protects the load; the anti-reverse polarity diode D2 is used for anti-reverse polarity protection of the ECU power supply; the positive pole of the normal power supplies power to the ECU module through the self-recovery fuse f13, and the ECU module enters a dormant state; after the ECU module detects the KEY_IN signal of the vehicle, the HSD-OUT1 pin outputs a high level, the normally open contact of the subsystem control relay Relay6 is closed, and the current flows through the self-recovery fuse f6-f11 to supply power to the CVM, water pump, PTC, valve body and other components of the fuel cell subsystem; when the fuel cell stack is in a low temperature environment, the ECU module pin LSD-O UT1 outputs a low level, the normally open contact of the stack end plate control relay Relay1 is closed, and the stack end plate heating film 1 is powered through the self-recovery fuse f1 and the stack end plate control relay Relay1; the ECU module pin LSD-OUT2 outputs a low level, the normally open contact of the stack end plate control relay Relay2 is closed, and the stack end plate heating film 2 is powered through the self-recovery fuse f2 and the stack end plate control relay Relay2; the ECU module pin LSD-OUT3 outputs a low level, the normally open contact of the stack end plate control relay Relay3 is closed, and the self-recovery fuse f2 and the stack end plate control relay Relay2 are powered. The reset fuse f3 and the stack end plate control relay Relay3 supply power to the stack end plate heating film three; the ECU module pin LSD-OUT4 outputs a low level, the normally open contact of the stack end plate control relay Relay4 closes, and the stack end plate heating film four is powered via the resettable fuse f4 and the stack end plate control relay Relay4; the ECU module pin LSD-OUT5 outputs a low level, the normally open contact of the hydrogen tail exhaust valve body control relay Relay5 closes, and the hydrogen tail exhaust valve body heating film is powered via the resettable fuse f5 and the hydrogen tail exhaust valve body control relay Relay5.

[0027] See also Figure 4 and Figure 5The box body (1) is provided with a water cooling plate (2) for dissipating heat for the circuit control system, and the water cooling plate (2) is respectively connected to a water cooling inlet joint (4) and a water cooling outlet joint (5) provided on the box body (1).

[0028] In actual applications, the water cooling inlet connector (4) and the water cooling outlet connector (5) are respectively connected to the water cooling plate (2), and the circuit control system is cooled by the water cooling plate (2) arranged on the box body (1), thereby effectively improving the heat dissipation performance of the system and extending the service life of the system.

[0029] See also Figures 1 to 5 The ECU module acts as a central control unit. First, it centrally controls the operation of the fuel cell DC / DC module, filter and discharge circuit, EIS module, air compressor control module, hydrogen circulation pump control module, step-down DC / DC module, HV-PDU, and LV-PDU modules, and performs information exchange and fault diagnosis. Second, it controls each subsystem of the fuel cell and performs information exchange and fault diagnosis through the LV_CON3 & LV_CON4 fuel cell system low-voltage communication interface (13, 14). The functions of LV_CON3 & LV_CON4 are defined as follows: CAN communication between the ECU module and CVM, PTC heater, circulating water pump, bypass valve, throttle, hydrogen concentration sensor, cooling system controller, and hydrogen system controller; analog input mainly includes temperature sensor signal and pressure sensor signal of air subsystem, temperature sensor signal of cooling subsystem, and temperature sensor signal and pressure sensor signal of hydrogen subsystem; switch input mainly includes liquid level alarm signal and high voltage interlock signal; frequency input mainly includes temperature signal and flow signal of air flow meter; high side drive output mainly includes speed control signal of cooling system fan; low side drive output mainly includes proportional valve, hydrogen inlet valve, and tail exhaust valve drive; H bridge drive output mainly includes electronic thermostat motor drive; thirdly, CAN communication with the whole vehicle is carried out through LV_CON5 whole vehicle low voltage communication interface (12) and receiving the whole vehicle hard line wake-up signal.

[0030] The ECU module monitors the status of the fuel cell system in real time through signal input and CAN communication, and controls the actuators of the fuel cell system in real time through drive output and CAN communication, ultimately achieving management and control of the hydrogen, air, water, heat, and electricity of the fuel cell system, information exchange, and fault diagnosis, ensuring reliable and efficient operation of the system.

[0031] See also Figure 2 and Figure 3, the fuel cell DC / DC module serves as a voltage conversion platform between the battery stack and the power battery to achieve voltage matching and power control functions. The fuel cell DC / DC module adopts the BUCK-BOOST buck-boost circuit topology to achieve buck-boost coupling between the battery stack platform and the lithium battery platform. It has a wide range of transformation ratios and is compatible with all high-power battery stack voltage platforms and commercial vehicle lithium battery platforms. The switching device is made of SiC material, which has low switching loss and high efficiency. The fuel cell DC / DC module has two control modes: input constant current control and input constant voltage control. The input constant voltage working mode controls the input voltage at the target value. One is used for the battery stack switch voltage clamping to avoid high potential and corrosion of the membrane electrode; the other is used for low stoichiometric ratio cold start of air, and the battery stack quickly heats up to complete the cold start process. The input constant current working mode controls the input current at the target value, which is used in the normal working process of the battery stack to control the power output. The fuel cell DC / DC module has the function of injecting AC disturbance at the input end. First, the ECU module collects the disturbance harmonic voltage and current through the EIS module, calculates the AC impedance value, and then analyzes the overall state of the fuel cell stack and performs water and thermal management adjustment. Second, the ECU module cooperates with the CVM to collect the harmonic voltage and harmonic current of the single-chip fuel cell stack, calculates the single-chip AC impedance value, and then analyzes the state of the single-chip fuel cell stack and performs water and thermal management adjustment.

[0032] The air compressor control module converts DC voltage into AC voltage, supplies power to the air compressor motor, and controls the speed of the air compressor motor by changing the switching frequency. The air compressor control module is used to control the start and stop, speed, and energy recovery of the air compressor.

[0033] The hydrogen circulation pump control module converts DC voltage into AC voltage, supplies power to the hydrogen circulation pump motor, and controls the speed of the hydrogen circulation pump motor by changing the switching frequency. The hydrogen circulation pump control module is used to control the start and stop, speed, and energy recovery of the hydrogen circulation pump.

[0034] The step-down DC / DC module adopts an isolated step-down circuit topology to convert the DC high voltage into a 27.5V DC low voltage to power the low-voltage fan of the battery stack cooling system.

[0035] The EIS module detects harmonic current through a shunt and an AC operational amplifier circuit, and detects harmonic voltage through a voltage acquisition circuit and an AC operational amplifier circuit. The ECU module calculates parameters such as impedance value, real part value, imaginary part value, phase angle, etc. through harmonic current and voltage.

[0036] The working process of the control system is further explained. The whole vehicle is connected to the normal power supply, the ECU is powered, and enters the dormant state; then the key switch of the whole vehicle is turned to the ON position, the ECU detects the KEY_IN electrical signal, the ECU wakes up, and after the initialization is completed, the fuel cell subsystem components are supplied with low-voltage electricity, and the ECU performs a low-voltage self-test; then the whole vehicle is powered on at high voltage, and the VCU sends the fuel cell startup signal and power request to the ECU, and the auxiliary heat dissipation of the fuel cell system starts to work; then the ECU executes the high-voltage power-on process, each module is supplied with high-voltage electricity, and a high-voltage self-test is performed; at the same time, the on-board hydrogen storage system starts to supply hydrogen; then the ECU completes the system startup self-test and executes the startup process; then the ECU controls the start of the stack cooling circuit cycle, the air supply, the hydrogen supply, and the fuel cell DC / DC module clamps the stack input voltage; then the fuel cell is successfully started and begins to respond to the vehicle power request; then the fuel cell DC / DC module works in the constant current mode to pull the power, and the ECU performs real-time hydrogen, air, water, heat, and electricity dynamic adjustments, and at the same time, the stack AC impedance value is monitored in real time, and deep water and heat management adjustments are performed.

[0037] Compared with the prior art, this application has the following beneficial effects: (1) It integrates ECU module, fuel cell DC / DC module, EIS module, air compressor control module, hydrogen circulation pump control module, step-down DC / DC module, HV-PDU module, LV-PDU module, filter module and discharge module, with high integration and powerful functions; (2) After integration, a large number of wiring harnesses, pipe connections and multiple shells are eliminated, which occupies a small space, is lightweight, improves power density, simplifies assembly and reduces costs; (3) The locations of water circuits and electrical interfaces are arranged according to the actual application scenarios, which are relatively concentrated and reasonably distributed. The wiring harness is simple and easy to use and maintain. (4) The control unit is deeply integrated and centrally controlled by the ECU module, which reduces costs and facilitates maintenance; (5) It integrates the step-down DC / DC module and the high-voltage fan power distribution unit, and is compatible with the power supply requirements of the low-voltage fan and the high-voltage fan of the cooling system; (6) With AC disturbance injection and harmonic detection functions, the ECU module can perform deep water and heat management adjustment through AC impedance parameters to improve the performance and life of the fuel cell stack; (7) The fuel cell DC / DC module controls the input constant voltage to perform fuel cell stack on / off voltage clamping and cold start, thus avoiding catalyst corrosion and increasing the service life of the fuel cell stack; (8) The fuel cell DC / DC module is compatible with all high-power fuel cell products and has high versatility; (9) High-voltage and low-voltage port filter circuit design, excellent electromagnetic compatibility performance.

[0038] In the above-mentioned embodiments, although the present invention has been described in conjunction with the specific embodiments of the present invention, many replacements, modifications and variations of these embodiments will be apparent to those of ordinary skill in the art based on the foregoing description. The embodiments of the present invention are intended to cover all such replacements, modifications and variations falling within the broad scope of the appended claims.

[0039] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A control system for a high-power hydrogen fuel cell, characterized in that: The invention comprises a box (1), wherein a circuit control system is arranged in the box (1), wherein the circuit control system comprises: an HV-PDU module, which is used for high-voltage power distribution, high-voltage pre-charging and overload short-circuit protection of the fuel cell system, and wherein the HV-PDU module is electrically connected to an HV_CON5 water pump / PTC power supply interface (7) and an HV_CON6 high-voltage fan power supply interface (8) arranged on the box (1); An LV-PDU module is used for low-voltage power supply filtering, control distribution and overload short-circuit protection of the fuel cell system, and the LV-PDU module is electrically connected to the LV_CON7 controller power supply negative input interface (15), the LV_CON6 controller power supply positive input interface (16), the LV_CON9 low-voltage power supply output interface (19) and the LV_CON8 system low-voltage negative interface (20) respectively provided on the box (1); A filter module, used for filtering high-voltage input and output ports, the filter module being electrically connected to an input copper busbar connector (3), an HV_CON1 high-voltage output positive electrode connector (9), and an HV_CON2 high-voltage output negative electrode connector (10) provided on the housing (1); Discharge module, used for discharging residual voltage of high voltage input and output circuits; EIS module, used for AC harmonic detection; An air compressor control module, used for starting and stopping the air compressor, speed control and fault diagnosis, the air compressor control module being electrically connected to an HV_CON3 air compressor power supply interface (6) provided on the housing (1); Fuel cell DC / DC module, used for voltage conversion between fuel cell stack and power battery; A hydrogen circulation pump control module, used for starting and stopping, controlling and diagnosing faults of the hydrogen circulation pump, the hydrogen circulation pump control module being electrically connected to an HV_CON4 hydrogen circulation pump power supply interface (11) provided on the box (1); A step-down DC / DC module, used to supply power to the heat dissipation system and the low-pressure fan of the battery stack after voltage conversion, the step-down DC / DC module being electrically connected to the LV_CON2 low-pressure fan negative power supply interface (17) and the LV_CON1 low-pressure fan positive power supply interface (18) provided on the box (1) respectively; An ECU module, used for central control processing and fault diagnosis, the ECU module being electrically connected to LV_CON3 & LV_CON4 fuel cell system low-voltage communication interfaces (13, 14) and LV_CON5 vehicle low-voltage communication interface (12) respectively provided on the box (1); The ECU module is electrically connected to the HV-PDU module, LV-PDU module, filter module, discharge module, EIS module, air compressor control module, fuel cell DC / DC module, hydrogen circulation pump control module and step-down DC / DC module respectively, and the HV-PDU module is electrically connected to the filter module, discharge module, air compressor control module, hydrogen circulation pump control module and step-down DC / DC module respectively.

2. A high-power hydrogen fuel cell control system according to claim 1, characterized in that: The input end of the HV-PDU module is electrically connected to the discharge module, and the output end of the HV-PDU module is electrically connected to the filter module. The HV-PDU module includes a plurality of positive fuses for overload and short circuit protection of the air compressor control module, the hydrogen circulation pump control module, the water pump, the PTC, the high-pressure fan, and the step-down DC / DC module, as well as a positive relay and a negative relay respectively connected to the positive and negative poles of the high-voltage line, and the positive relay is connected in parallel with a pre-charge relay.

3. A high-power hydrogen fuel cell control system according to claim 1, characterized in that: The filter module includes an input filter circuit and an output filter circuit, both of which are electrically connected to the ECU module. The input filter circuit is arranged at the input end of the high-voltage circuit and is connected to the discharge module. The output filter circuit is arranged at the output end of the high-voltage circuit and is electrically connected to the HV-PDU module.

4. A control system for a high-power hydrogen fuel cell according to claim 3, characterized in that: The discharge module includes a discharge path one and a discharge path two, both of which are electrically connected to the ECU module, the discharge path one is electrically connected to the input filter circuit and the EIS module respectively, and the discharge path two is electrically connected to the fuel cell DC / DC module and the HV-PDU module respectively.

5. The control system of a high-power hydrogen fuel cell according to claim 1, characterized in that: The LV-PDU module comprises a common-mode inductor electrically connected to the negative input interface (15) of the LV_CON7 controller power supply, the positive input interface (16) of the LV_CON6 controller power supply, and the low-voltage negative interface (20) of the LV_CON8 system, respectively. The common-mode inductor is used for filtering the input normal power supply and improving the EMC performance. The common-mode inductor is connected to a subsystem control relay for controlling the power supply of the fuel cell subsystem. The subsystem control relay is electrically connected to the LV_CON9 low-voltage power supply output interface (19). The control relay is connected to a hydrogen tail exhaust valve body control relay and a plurality of stack end plate control relays, and the plurality of stack end plate control relays respectively control the power supply of each stack end plate heating film, and the hydrogen tail exhaust valve body control relay controls the power supply of the hydrogen tail exhaust valve body heating film, and the hydrogen tail exhaust valve body control relay and the plurality of stack end plate control relays are all electrically connected to the LV_CON9 low-voltage power supply output interface (19), and the common mode inductor, subsystem control relay, hydrogen tail exhaust valve body control relay and the plurality of stack end plate control relays are all electrically connected to the ECU module.

6. A high-power hydrogen fuel cell control system according to claim 1, characterized in that: The box body (1) is provided with a water cooling plate (2) for dissipating heat for the circuit control system, and the water cooling plate (2) is respectively connected to a water cooling inlet joint (4) and a water cooling outlet joint (5) provided on the box body (1).

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