A dual-pump type thermal management system for a high-power fuel cell engine

Abstract

The present invention discloses a dual-pump type thermal management system for a high-power fuel cell engine, comprising: an outlet of a fuel cell stack branches out after passing through an outlet temperature and pressure sensor; the first branch passes through a deionizer and is connected in parallel at both ends of the fuel cell stack; the second branch passes through a hydrogen heater and is connected in parallel at both ends of the fuel cell stack; the third branch passes through a low-pressure water pump, a water heater, a high-pressure water pump and an electronic thermostat; the fourth branch bypasses the pipelines on the low-pressure water pump and the water heater, the high-pressure water pump and the electronic thermostat; when the small cycle is turned on, the output water path of the electronic thermostat passes through an intercooler and a water filter and enters the fuel cell stack through an inlet temperature and pressure sensor; when the large cycle is turned on, the output water path of the electronic thermostat passes through an electronic fan assembly and a water filter and enters the fuel cell stack through an inlet temperature and pressure sensor. The present invention precisely controls the heating and cooling of the system to meet different thermal management requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of automobiles, and more specifically, to a dual-pump type thermal management system for a high-power fuel cell engine. Background Art

[0002] Compared with traditional fuel vehicles, fuel cell engines have higher requirements for heat dissipation efficiency. During the operation of a fuel cell vehicle, a large amount of heat is generated by the core component of its engine, the fuel cell stack, which is usually twice that of a traditional internal combustion engine vehicle. Moreover, the fuel cell stack is highly sensitive to temperature, and the change in the cooling water temperature has a great impact on the efficiency of the fuel cell stack. Compared with fuel vehicles, the coolant temperature of fuel cell vehicles is closer to room temperature, and the heat dissipation requirement is greater. Therefore, higher requirements are put forward for the thermal management system of fuel cells. Under complex working conditions such as startup, load pulling, and load reduction, affected by factors such as the response time of components such as water pumps and radiator fans, there will be a certain lag in the system's control of the coolant temperature, increasing the fluctuation range of the coolant temperature at the inlet and outlet of the fuel cell stack, and further affecting the dynamic response performance of the fuel cell engine system and the service life of the fuel cell stack. In addition, in addition to factors such as increasing the heat dissipation area, reasonable intake grille design, optimizing the radiator layout and structure design, and improving the efficiency of the fuel cell stack, a fast, accurate, and efficient thermal management system control strategy is of great significance for the safe operation of the fuel cell engine system and the whole vehicle. And with the expansion of the fuel cell usage scenario to heavy commercial vehicles, a fuel cell engine with a higher power will inevitably bring higher heat dissipation requirements.

[0003] Technical Solution of the First Prior Art

[0004] Patent CN 112506250 A discloses a thermal management temperature control system for a fuel cell of a hydrogen energy vehicle and a hydrogen energy vehicle. Its technical solution is as follows: According to the vehicle performance parameters, after establishing a thermal management control model based on the whole vehicle thermal management control principle, by obtaining the road information in front of the vehicle and taking the road information in front as the input value and the thermal management control model as the operation model, the required output powers of the electric water pump, the electric thermostat, and the electric radiator fan can be calculated. The fuel cell system controller controls the electric water pump, the electric thermostat, and the electric radiator fan according to the required output powers.

[0005] Disadvantages of the First Prior Art

[0006] 1) The existing technical solution results in an overly complex control model, involving vehicle performance parameters including vehicle weight, drag coefficient, rolling resistance coefficient, tire diameter, etc., leading to a too large deviation between the actual output power of the fuel cell stack and the calculation model, and the model distortion.

[0007] 2) The fuel cell stack control system controls fewer components, and the controlled components are incomplete. When the system power is large or the design is complex, not all controlled components can be covered.

[0008] Therefore, how to provide a dual-pump type thermal management system for a high-power fuel cell engine has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0009] The object of the present invention is to provide a dual-pump type thermal management system for a high-power fuel cell engine.

[0010] The present invention discloses a dual-pump type thermal management system for a high-power fuel cell engine in a first aspect. The system includes: a fuel cell stack, a low-pressure water pump, a water heater, a high-pressure water pump, an electronic thermostat, a hydrogen heater, a deionizer, an intercooler, an in-stack temperature and pressure sensor, an out-stack temperature and pressure sensor, a water filter, an electronic fan assembly, and a fuel cell system controller;

[0011] The water outlet of the fuel cell stack branches out after passing through the out-stack temperature and pressure sensor; the first branch passes through the deionizer and is connected in parallel at both ends of the fuel cell stack; the second branch passes through the hydrogen heater and is connected in parallel at both ends of the fuel cell stack; the third branch passes through the low-pressure water pump, the water heater, the high-pressure water pump, and the electronic thermostat; the fourth branch passes through a bypass pipeline on the low-pressure water pump and the water heater, the high-pressure water pump, and the electronic thermostat; when the small cycle is turned on, the output water path of the electronic thermostat passes through the intercooler and the water filter, and enters the fuel cell stack through the in-stack temperature and pressure sensor; when the large cycle is turned on, the output water path of the electronic thermostat passes through the electronic fan assembly and the water filter, and enters the fuel cell stack through the in-stack temperature and pressure sensor;

[0012] The fuel cell system controller is hard-wired to the low-pressure water pump and performs PWM control on the low-pressure water pump;

[0013] The fuel cell system controller is hard-wired to the electronic fan assembly and performs PWM control on the electronic fan assembly;

[0014] The fuel cell system controller is connected to the high-pressure water pump through 3CAN communication and controls the high-pressure water pump through CAN communication;

[0015] The fuel cell system controller is connected to the electronic thermostat through 5CAN communication and controls the electronic thermostat through CAN communication;

[0016] The fuel cell system controller is connected to the water heater through CAN communication and controls the water heater through CAN communication.

[0017] According to the system of the first aspect of the present invention, the system further includes: an expansion water kettle;

[0018] The expansion water tank is connected to the high-pressure water pump and the electronic fan assembly; the expansion water tank replenishes water before the high-pressure water pump and degasses before the electronic fan assembly.

[0019] The system according to the first aspect of the present invention is characterized in that the system further comprises: a state monitoring unit;

[0020] The state monitoring unit is in CAN communication connection with the fuel cell system controller.

[0021] The system according to the first aspect of the present invention is characterized in that the state monitoring unit takes the temperature data of the ambient temperature sensor, the temperature data of the in-stack temperature and pressure sensor, and the temperature data of the out-stack temperature and pressure sensor as inputs, and takes the control set values of the low-pressure water pump, the water heater, the high-pressure water pump, the electronic thermostat and the electronic fan assembly as outputs to establish an optimal control model;

[0022] The state monitoring unit applies the optimal control model, and according to the temperature data of the ambient temperature sensor, the temperature data of the in-stack temperature and pressure sensor, and the temperature data of the out-stack temperature and pressure sensor, gives the control set values of the low-pressure water pump, the water heater, the high-pressure water pump, the electronic thermostat and the electronic fan assembly, and outputs the control set values to the fuel cell system controller.

[0023] The system according to the first aspect of the present invention is characterized in that the fuel cell system controller controls the low-pressure water pump, the water heater, the high-pressure water pump, the electronic thermostat and the electronic fan assembly according to the control set values.

[0024] The system according to the first aspect of the present invention is characterized in that the method for controlling the low-pressure water pump, the water heater, the high-pressure water pump, the electronic thermostat and the electronic fan assembly includes:

[0025] If the temperature data of the ambient temperature sensor < the first preset value T1 and the temperature data of the out-stack temperature and pressure sensor < the second preset value T2, then enter the low-temperature cold start mode;

[0026] If the temperature data of the ambient temperature sensor < the first preset value T1 and the second preset value T2 < the temperature data of the out-stack temperature and pressure sensor < the third preset value T3, then enter the low-temperature hot start mode;

[0027] If the temperature data of the ambient temperature sensor ≥ the first preset value T1 and the temperature data of the out-stack temperature and pressure sensor ≥ the third preset value T3, then enter the normal temperature start mode;

[0028] If the temperature data of the outlet temperature and pressure sensor > the fourth preset value T4, or the temperature data of the outlet temperature and pressure sensor - the temperature data of the inlet temperature and pressure sensor > 10°C, and it lasts for 20S, then the over-temperature protection control function is entered.

[0029] According to the system of the first aspect of the present invention, it is characterized in that the method of the low-temperature cold start mode includes: the rotation speed of the high-pressure water pump is 0 rpm, the rotation angle of the electronic thermostat is 0°, the duty cycle signal of the low-pressure water pump is 90%, and the power signal of the water heater is 100%.

[0030] According to the system of the first aspect of the present invention, it is characterized in that the method of the low-temperature hot start mode includes: the rotation speed of the high-pressure water pump is 0 rpm, the rotation angle of the electronic thermostat is 0°, the duty cycle signal of the low-pressure water pump is 50%, and the power signal of the water heater is 50%.

[0031] According to the system of the first aspect of the present invention, it is characterized in that the method of the normal temperature start mode includes: the rotation speed of the high-pressure water pump is 3000 rpm, the rotation angle of the electronic thermostat is 0°, the duty cycle signal of the low-pressure water pump is 0%, and the power signal of the water heater is 0%.

[0032] According to the technical content disclosed by the present invention, it has the following beneficial effects:

[0033] 1) A dual-pump multi-loop waterway thermal management system represented by a low-pressure water pump and a high-pressure water pump is established. According to different functional modes and thermal management requirements, the on-off combinations of various components can be controlled to different working cycle modes, and the system heating and cooling can be accurately controlled to meet different thermal management needs.

[0034] 2) Different functional mode combinations ensure the reasonable and timely operation of various components, reduce redundant energy consumption, and the combination of multiple loops can coordinate the heating and cooling requirements of different waterways in specific scenarios, thereby bringing a higher comprehensive heat utilization rate and reducing the energy consumption of the whole vehicle.

[0035] 3) The control system of this solution has fewer input calculation quantities, a simple control logic, and a high execution efficiency of the controlled components, so that the system model has a small calculation amount, a fast response speed, and a high control accuracy.

[0036] 4) There are fewer components in the main cooling loop waterway of the system, only a high-pressure water pump, an electronic thermostat, an intercooler, and a water filter. The loop flow resistance is small, and the drainage volume of the high-pressure water pump is large, so as to meet the large-flow demand of the cooling water under the normal working state of a high-power fuel cell engine.

[0037] 5) The solution designs a hydrogen heating branch, which can preheat the hydrogen supply on the anode side to prevent the anode side from being flooded due to water vapor condensation.

[0038] 6) The solution designs a stack heating branch, which can start the water heater when needed, so as to make the waterway heating efficiency higher and meet the start-up thermal management requirements for low-temperature cold start.

[0039] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The drawings incorporated in and constituting a part of this specification illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0041] Figure 1 FIG. is a structural diagram of a dual-pump type thermal management system for a high-power fuel cell engine provided according to an embodiment.

[0042] In the figure, 1 - fuel cell stack, 2 - low-pressure water pump, 3 - water heater, 4 - high-pressure water pump, 5 - electronic thermostat, 6 - expansion water tank, 7 - hydrogen heater, 8 - deionizer, 9 - intercooler, 10 - in-stack temperature and pressure sensor, 11 - out-stack temperature and pressure sensor, 12 - water filter, 13 - electronic fan assembly, 14 - fuel cell system controller. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] Now, various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present invention.

[0044] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or its use.

[0045] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the specification.

[0046] In all the examples shown and discussed herein, any specific values should be construed as merely exemplary and not as limitations. Thus, other examples of exemplary embodiments may have different values.

[0047] It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further discussed in subsequent drawings. Embodiment

[0048] The first aspect of the present invention discloses a dual-pump type thermal management system for a high-power fuel cell engine. Figure 1The structural diagram of a dual-pump type thermal management system for a high-power fuel cell engine according to an embodiment of the present invention is specifically as follows Figure 1 As shown, the system includes: The system includes: a fuel cell stack 1, a low-pressure water pump 2, a water heater 3, a high-pressure water pump 4, an electronic thermostat 5, a hydrogen heater 7, a deionizer 8, an intercooler 9, an in-stack temperature and pressure sensor 10, an out-stack temperature and pressure sensor 11, a water filter 12, an electronic fan assembly 13, and a fuel cell system controller 14, that is Figure 1 the FCU controller in

[0049] The outlet of the fuel cell stack 1 branches into 4 paths after passing through the out-stack temperature and pressure sensor 11; The first branch passes through the deionizer 8 and is connected in parallel at both ends of the fuel cell stack 1; The second branch passes through the hydrogen heater 7 and is connected in parallel at both ends of the fuel cell stack 1; The third branch passes through the low-pressure water pump 2, the water heater 3, the high-pressure water pump 4, and the electronic thermostat 5; The fourth branch passes through the bypass pipelines on the low-pressure water pump 2 and the water heater 3, the high-pressure water pump 4, and the electronic thermostat 5; When the small cycle is turned on, the output water path of the electronic thermostat 5 passes through the intercooler 9 and the water filter 12, and enters the fuel cell stack 1 through the in-stack temperature and pressure sensor 10; When the large cycle is turned on, the output water path of the electronic thermostat 5 passes through the electronic fan assembly 13 and the water filter 12, and enters the fuel cell stack 1 through the in-stack temperature and pressure sensor 10;

[0050] The fuel cell system controller 14 is hard-wired to the low-pressure water pump 2 and performs PWM control on the low-pressure water pump 2;

[0051] The fuel cell system controller 14 is hard-wired to the electronic fan assembly 13 and performs PWM control on the electronic fan assembly 13;

[0052] The fuel cell system controller 14 is CAN communication-connected to the high-pressure water pump 4 and controls the high-pressure water pump 4 through CAN communication;

[0053] The fuel cell system controller 14 is CAN communication-connected to the electronic thermostat 5 and controls the electronic thermostat 5 through CAN communication;

[0054] The fuel cell system controller 14 is CAN communication-connected to the water heater 3 and controls the water heater 3 through CAN communication.

[0055] In some embodiments, the system further includes: an expansion water tank 6;

[0056] The expansion water tank 6 is connected to the high-pressure water pump 4 and the electronic fan assembly 13; the expansion water tank 6 replenishes water before the high-pressure water pump 4 and removes air before the electronic fan assembly 13.

[0057] In some embodiments, the system further includes: a state monitoring unit;

[0058] The state monitoring unit is connected to the fuel cell system controller 14 through CAN communication.

[0059] The state monitoring unit takes the temperature data of the ambient temperature sensor, the temperature data of the in-stack temperature and pressure sensor 10, and the temperature data of the out-stack temperature and pressure sensor 11 as inputs, and takes the control set values of the low-pressure water pump 2, the water heater 3, the high-pressure water pump 4, the electronic thermostat 5, and the electronic fan assembly 13 as outputs to establish an optimal control model;

[0060] The state monitoring unit applies the optimal control model, and according to the temperature data of the ambient temperature sensor, the temperature data of the in-stack temperature and pressure sensor 10, and the temperature data of the out-stack temperature and pressure sensor 11, gives the control set values of the low-pressure water pump 2, the water heater 3, the high-pressure water pump 4, the electronic thermostat 5, and the electronic fan assembly 13, and outputs the control set values to the fuel cell system controller 14.

[0061] The fuel cell system controller 14 controls the low-pressure water pump 2, the water heater 3, the high-pressure water pump 4, the electronic thermostat 5, and the electronic fan assembly 13 according to the control set values.

[0062] The method for controlling the low-pressure water pump 2, the water heater 3, the high-pressure water pump 4, the electronic thermostat 5, and the electronic fan assembly 13 includes:

[0063] If the temperature data of the ambient temperature sensor < the first preset value T1 and the temperature data of the out-stack temperature and pressure sensor 11 < the second preset value T2, then enter the low-temperature cold start mode;

[0064] If the temperature data of the ambient temperature sensor < the first preset value T1 and the second preset value T2 < the temperature data of the out-stack temperature and pressure sensor 11 < the third preset value T3, then enter the low-temperature hot start mode;

[0065] If the temperature data of the ambient temperature sensor ≥ the first preset value T1 and the temperature data of the out-stack temperature and pressure sensor 11 ≥ the third preset value T3, then enter the normal temperature start mode;

[0066] If the temperature data of the outlet pile temperature and pressure sensor 11 > the fourth preset value T4, or the temperature data of the outlet pile temperature and pressure sensor 11 - the temperature data of the inlet pile temperature and pressure sensor 10 > 10°C, and it lasts for 20S, then the over-temperature protection control function is entered.

[0067] The method of the low-temperature cold start mode includes: the high-pressure water pump speed is 0 rpm, the electronic thermostat rotation angle is 0°, the low-pressure water pump duty ratio signal is 90%, and the water heater power signal is 100%.

[0068] The method of the low-temperature hot start mode includes: the high-pressure water pump speed is 0 rpm, the electronic thermostat rotation angle is 0°, the low-pressure water pump duty ratio signal is 50%, and the water heater power signal is 50%.

[0069] The method of the normal-temperature start mode includes: the high-pressure water pump speed is 3000 rpm, the electronic thermostat rotation angle is 0°, the low-pressure water pump duty ratio signal is 0%, and the water heater power signal is 0%.

[0070] The method of the over-temperature protection control function includes: the high-pressure water pump speed is 6000 rpm, the electronic thermostat rotation angle is 90°, the low-pressure water pump duty ratio signal is 0%, and the water heater power signal is 0%.

[0071] In summary, the technical solutions in various aspects of the present invention have the following advantages compared with the prior art:

[0072] 1) A dual-pump multi-loop waterway thermal management system represented by a low-pressure water pump and a high-pressure water pump is established. It can control the switching combinations of various components to different working cycle modes according to different functional modes and thermal management requirements, and precisely control the system heating and cooling to meet different thermal management needs.

[0073] 2) Different functional mode combinations ensure the reasonable and timely operation of each component, reduce redundant energy consumption, and the combination of multiple loops can coordinate the heating and cooling requirements of different waterways in specific scenarios, thus bringing a more efficient comprehensive heat utilization rate and reducing the energy consumption of the whole vehicle.

[0074] 3) The control system of this solution has fewer input quantities for calculation, a simple control logic, and a high execution efficiency of the controlled components, so that the system model has a small calculation amount, a fast response speed, and a high control accuracy.

[0075] 4) There are fewer components in the main cooling loop waterway of the system, only a high-pressure water pump, an electronic thermostat, an intercooler, and a water filter. The loop flow resistance is small, and the drainage volume of the high-pressure water pump is large, so as to meet the large-flow demand of cooling water under the normal working state of a high-power fuel cell engine.

[0076] 5) The solution designs a hydrogen heating branch, which can pre-heat the hydrogen supply on the anode side to prevent waterlogging of the fuel cell stack caused by water vapor condensation on the anode side.

[0077] 6) The solution designs a fuel cell stack heating branch, which can start the water heater when needed, so that the water path has a higher temperature rise efficiency and meets the start-up thermal management requirements for cold start at low temperature.

[0078] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A dual-pump type thermal management system for a high-power fuel cell engine, characterized in that, The system includes: a fuel cell stack, a low-pressure water pump, a water heater, a high-pressure water pump, an electronic thermostat, a hydrogen heater, a deionizer, an intercooler, an in-stack temperature and pressure sensor, an out-stack temperature and pressure sensor, a water filter, an electronic fan assembly, and a fuel cell system controller; The outlet of the fuel cell stack branches out after passing through the out-stack temperature and pressure sensor; the first branch passes through the deionizer and is connected in parallel at both ends of the fuel cell stack; the second branch passes through the hydrogen heater and is connected in parallel at both ends of the fuel cell stack; the third branch passes through the low-pressure water pump, the water heater, the high-pressure water pump, and the electronic thermostat; the fourth branch passes through a bypass pipeline on the low-pressure water pump and the water heater, the high-pressure water pump, and the electronic thermostat; when the small cycle is turned on, the output water path of the electronic thermostat passes through the intercooler and the water filter and enters the fuel cell stack through the in-stack temperature and pressure sensor; when the large cycle is turned on, the output water path of the electronic thermostat passes through the electronic fan assembly and the water filter and enters the fuel cell stack through the in-stack temperature and pressure sensor; The fuel cell system controller is hard-wired to the low-pressure water pump and performs PWM control on the low-pressure water pump; The fuel cell system controller is hard-wired to the electronic fan assembly and performs PWM control on the electronic fan assembly; The fuel cell system controller is CAN communication-connected to the high-pressure water pump and controls the high-pressure water pump through CAN communication; The fuel cell system controller is CAN communication-connected to the electronic thermostat and controls the electronic thermostat through CAN communication; The fuel cell system controller is CAN communication-connected to the water heater and controls the water heater through CAN communication.

2. The dual-pump type thermal management system for a high-power fuel cell engine according to claim 1, wherein The system further includes: an expansion water tank; The expansion water tank is connected to the high-pressure water pump and the electronic fan assembly; the expansion water tank replenishes water in front of the high-pressure water pump and removes air in front of the electronic fan assembly.

3. The dual-pump type thermal management system for a high-power fuel cell engine according to claim 1, characterized in that, The system further includes: a state monitoring unit; The state monitoring unit is CAN communication-connected to the fuel cell system controller.

4. The dual-pump type thermal management system for a high-power fuel cell engine according to claim 3, wherein The state monitoring unit takes the temperature data of the ambient temperature sensor, the temperature data of the in-stack temperature and pressure sensor, and the temperature data of the out-stack temperature and pressure sensor as inputs, and takes the control set values of the low-pressure water pump, the water heater, the high-pressure water pump, the electronic thermostat, and the electronic fan assembly as outputs to establish an optimal control model; The state monitoring unit applies the optimal control model, and based on the temperature data of the ambient temperature sensor, the temperature data of the in-stack temperature and pressure sensor, and the temperature data of the out-stack temperature and pressure sensor, gives the control set values of the low-pressure water pump, the water heater, the high-pressure water pump, the electronic thermostat, and the electronic fan assembly, and outputs the control set values to the fuel cell system controller.

5. A dual-pump type thermal management system for a high-power fuel cell engine according to claim 4, characterized in that, The fuel cell system controller controls the low-pressure water pump, the water heater, the high-pressure water pump, the electronic thermostat, and the electronic fan assembly according to the control set values.

6. The dual-pump type thermal management system for a high-power fuel cell engine according to claim 5, characterized in that, The method for controlling the low-pressure water pump, water heater, high-pressure water pump, electronic thermostat and electronic fan assembly includes: If the temperature data of the ambient temperature sensor < the first preset value T1 and the temperature data of the out-of-reactor temperature and pressure sensor < the second preset value T2, then enter the low-temperature cold start mode; If the temperature data of the ambient temperature sensor < the first preset value T1 and the second preset value T2 < the temperature data of the out-of-reactor temperature and pressure sensor < the third preset value T3, then enter the low-temperature hot start mode; If the temperature data of the ambient temperature sensor ≥ the first preset value T1 and the temperature data of the out-of-reactor temperature and pressure sensor ≥ the third preset value T3, then enter the normal temperature start mode; If the temperature data of the out-of-reactor temperature and pressure sensor > the fourth preset value T4, or the temperature data of the out-of-reactor temperature and pressure sensor minus the temperature data of the in-reactor temperature and pressure sensor > 10°C and lasts for 20S, then enter the over-temperature protection control function.

7. A dual-pump type thermal management system for a high-power fuel cell engine according to claim 6, characterized in that, The method of the low-temperature cold start mode includes: the high-pressure water pump speed is 0 rpm, the rotation angle of the electronic thermostat is 0°, the duty ratio signal of the low-pressure water pump is 90%, and the power signal of the water heater is 100%.

8. The dual-pump type thermal management system for a high-power fuel cell engine according to claim 6, wherein, The method of the low-temperature hot start mode includes: the high-pressure water pump speed is 0 rpm, the rotation angle of the electronic thermostat is 0°, the duty ratio signal of the low-pressure water pump is 50%, and the power signal of the water heater is 50%.

9. The dual-pump type thermal management system for a high-power fuel cell engine according to claim 6, wherein The method of the normal temperature start mode includes: the high-pressure water pump speed is 3000 rpm, the rotation angle of the electronic thermostat is 0°, the duty ratio signal of the low-pressure water pump is 0%, and the power signal of the water heater is 0%.

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