Fuel cell engine thermal management calibration method and device

Abstract

The invention discloses a fuel cell engine thermal management calibration method, and relates to the technical field of fuel cell engines, and the method comprises the steps: selecting an environmental chamber, placing a fuel cell engine and a heat dissipation device in the environmental chamber, standing the fuel cell engine and the heat dissipation device for a set time, operating the engine, and adjusting the working condition of the fuel cell engine. According to the working condition of a fuel cell engine, a temperature adjusting control strategy is obtained, heat management key management parameters are obtained, according to the working condition of the fuel cell engine, the deviation between the heat management key management parameters and the set temperature is obtained, the temperature adjusting control strategy is applied to a whole vehicle for verification, and whole vehicle temperature control parameters are generated; comparative judgment is conducted on the whole vehicle temperature control parameters and conventional engine thermal management calibration parameters, the fuel cell engine calibration period is shortened by obtaining an adjustment temperature control strategy, and the output power and energy efficiency of a fuel cell are improved.

Description

Technical Field

[0001] The present application relates to the technical field of fuel cell engines, and particularly relates to a fuel cell engine thermal management calibration method, a fuel cell engine thermal management calibration device, an electronic device, a storage medium, and a detection platform. Background Art

[0002] Zero-carbon and zero-pollution is the future trend of power development. The principle of a proton exchange membrane fuel cell is to use hydrogen and oxygen to react and directly convert chemical energy into electrical energy. Due to advantages such as high energy conversion efficiency and no pollution, hydrogen fuel cells are one of the best solutions to achieve the above goals.

[0003] In both the traditional energy field and the new energy field, thermal management technology is one of the very core technologies and also the top priority in product R & D work. Currently, the thermal management calibration cycle of fuel cell engines is relatively long, and the temperature stability is poor, which has a great impact on the performance and durability life of fuel cell engines. Ensuring that the engine can maintain within the optimal working temperature range during operation is not only related to economy but also directly affects the engine's life. When the engine temperature is too high or too low, it will lead to unreasonable humidity inside the fuel cell and unstable catalyst performance, resulting in performance degradation and life damage. In addition, saving calibration time is also of great significance for shortening the product R & D cycle.

[0004] Regarding the fuel cell engine thermal management calibration method, there are mainly the following several in the prior art;

[0005] 1. Application No. CN119674122A, patent name: "A Thermal Management System for Fuel Cells". This management system provides a thermal management structure for a fuel cell vehicle and a fuel cell engine. Its advantage lies in the difference in structure from the traditional automotive thermal management system. The basic thermal management structure of traditional fuel cell vehicles is independently distributed for respective heat dissipation, that is, a distributed thermal management system is used for heat dissipation, so that the energy of each subsystem cannot be fully utilized, especially the residual heat of high-energy-consuming components such as motors and electronic controls, resulting in a waste of energy. This application relates to the field of new energy vehicles, and this device can make full use of the waste heat of the fuel cell stack, electric drive, battery, and air conditioner systems. This patent only provides a device for vehicle thermal management, focusing more on the structural advantages of the device, and does not mention how to perform thermal management calibration and thermal management algorithms, etc.

[0006] 2. Application No.: CN119674127A, Patent Name: "Fuel Cell Vehicle Thermal Management Device and Fuel Cell Vehicle". This device provides a thermal management system for fuel cells. The thermal management system for fuel cells includes a cooling circulation water path, a large circulation loop, a small circulation loop, and an internal circulation loop. Among them, the cooling circulation water path exchanges heat with the large circulation loop through a heat exchanger. The small circulation loop is used to quickly cool down the fuel cell stack. The internal circulation loop is used to warm up the fuel cell stack at the initial stage of cold start at low temperature. This invention can improve the start-up efficiency of the fuel cell stack during the cold start process, and can quickly cool down the internal core of the fuel cell stack during the low-temperature storage stage, shortening the low-temperature storage time. This patent provides a bench test device for realizing rapid cold start for the fuel cell stack, which focuses more on the structural advantages of the device and does not mention how to perform thermal management calibration and thermal management algorithms, etc. Summary of the Invention

[0007] The purpose of the present invention is to provide a method for calibrating the thermal management of a fuel cell engine. The present invention places the complete thermal management system of the fuel cell engine in an environmental chamber that meets the engine heat dissipation requirements. The temperature and humidity in the chamber are adjustable, and an advanced method is used to control the actions of each actuator in the thermal management system, greatly shortening the time for calibrating the thermal management of the fuel cell engine, and enabling fine control of each parameter, which is of great significance for ensuring the stable performance of the fuel cell engine, extending its service life, improving the safety factor, and enhancing the energy efficiency.

[0008] The present invention provides the following solutions:

[0009] According to one aspect of the present invention, there is provided a method for calibrating the thermal management of a fuel cell engine. The method for calibrating the thermal management of a fuel cell engine includes:

[0010] Step S1: Select an environmental chamber set on the engine bench, obtain the environmental temperature and humidity in the environmental chamber, and make the environmental temperature and humidity in the environmental chamber within a preset range.

[0011] Step S2: Place the fuel cell engine and the heat dissipation device in the environmental chamber.

[0012] Step S3: Obtain the environmental temperature and humidity range of the environmental chamber. After the fuel cell engine and the heat dissipation device are static for a set time, start the engine.

[0013] Step S4: Adjust the operating conditions of the fuel cell engine. According to the operating conditions of the fuel cell engine, obtain an adjusted temperature control strategy and obtain the key management parameters of thermal management.

[0014] Step S5: Set an environmental temperature range in the environmental chamber. According to the adjustment of the operating conditions of the fuel cell engine, obtain the deviation between the key management parameters of thermal management and the set temperature.

[0015] Step S6: Apply the adjusted temperature control strategy to the whole vehicle for verification and generate the whole vehicle temperature control parameters;

[0016] Step S7: Obtain the conventional engine thermal management calibration parameters;

[0017] Step S8: Compare and judge the whole vehicle temperature control parameters with the conventional engine thermal management calibration parameters.

[0018] Further, Step S1 includes:

[0019] Obtain the bench preset calibration time;

[0020] Obtain the key thermal management parameters within the bench preset calibration time.

[0021] The key thermal management parameters include: the inlet temperature of the fuel cell stack, the outlet temperature of the fuel cell stack, the inlet temperature of the radiator, the outlet temperature of the radiator, the inlet pressure of the fuel cell, and the target inlet temperature of the fuel cell stack;

[0022] Further, Step S4 includes:

[0023] The adjusted temperature control strategy includes:

[0024] The electronic control unit and the electronically controlled thermostat;

[0025] Obtain the operating temperature range of the battery stack;

[0026] Obtain the mixing ratio of the electronically controlled thermostat;

[0027] The electronic control unit receives the key thermal management parameters;

[0028] Generate an electronically controlled thermostat mixing strategy according to the mixing ratio of the electronically controlled thermostat,

[0029] The electronic control unit controls the opening degree of the electronically controlled thermostat according to the electronically controlled thermostat mixing strategy.

[0030] Further, Step S4 includes:

[0031] The adjusted temperature control strategy further includes:

[0032] When the outlet temperature of the fuel cell stack is less than the lower limit of the operating temperature range of the battery stack, the opening degree of the electronically controlled thermostat decreases according to a preset control curve, including decreasing to 0%, and the radiator flow rate gradually decreases;

[0033] When the outlet temperature of the radiator is greater than or equal to the upper limit of the operating temperature range of the battery stack, the opening degree of the electronically controlled thermostat increases according to a preset control curve, including increasing to 100%, and the radiator flow rate gradually increases.

[0034] Further, step S4 further includes:

[0035] Adjusting the temperature control strategy further includes:

[0036] Adjusting the fan speed;

[0037] The electronic control unit adjusts according to the key thermal management parameters.

[0038] Further, step S4 includes:

[0039] Adjusting the fan speed;

[0040] The electronic control unit adjusts according to the key thermal management parameters.

[0041] Further, step S4 includes:

[0042] The electronic control unit sets the initial value of the fan speed according to the key thermal management parameters;

[0043] Obtain the target temperature at the fuel cell inlet, and generate a closed-loop control result value according to the difference between the target temperature and the actual temperature;

[0044] Generate the final fan control value according to the initial value of the fan speed and the closed-loop control result value.

[0045] According to a second aspect of the present invention, there is provided a fuel cell engine thermal management calibration device, including: a bench module, an environmental chamber module, a fuel cell engine operating condition adjustment module, a temperature sampling module, and an adjusted temperature control module;

[0046] The bench module is used to provide a test platform for the fuel cell engine to be tested;

[0047] The environmental chamber module is used to provide an adjustable temperature and humidity environment for the fuel cell engine to be tested and the heat dissipation system;

[0048] The fuel cell engine operating condition adjustment module is used to provide adjustable fuel cell engine operating conditions during the test;

[0049] The temperature sampling module is used to collect temperature changes during the test;

[0050] The adjusted temperature control module is used to adjust the operating temperature of the fuel cell under the fuel cell engine operating conditions.

[0051] According to a third aspect of the present invention, there is provided an electronic device, including: a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus;

[0052] A computer program is stored in a memory. When the computer program is executed by a processor, it causes the processor to execute the steps of a fuel cell engine thermal management calibration method.

[0053] According to four aspects of the present invention, a computer-readable storage medium is provided, which stores a computer program executable by an electronic device. When the computer program runs on the electronic device, it causes the electronic device to execute the steps of a fuel cell engine thermal management calibration method.

[0054] According to five aspects of the present invention, a detection platform is provided, including:

[0055] An electronic device for implementing the steps of a fuel cell engine thermal management calibration method;

[0056] A processor that runs a program. When the program runs, it executes the steps of a fuel cell engine thermal management calibration method on the data output from the electronic device;

[0057] A storage medium for storing a program. When the program runs, it executes the steps of a fuel cell engine thermal management calibration method on the data output from the electronic device.

[0058] Through the above solutions, the following beneficial technical effects are obtained:

[0059] In this application, by setting up an environmental chamber, the heat dissipation of each system can be centralized, ensuring that the energy between each subsystem is fully utilized.

[0060] In this application, by controlling the opening of the electronically controlled thermostat through an electronic control unit, the flow rate and circulation path of the coolant can be accurately adjusted, enabling the fuel cell stack to always maintain within the normal operating temperature range. Through a stable temperature environment, the electrochemical reaction inside the fuel cell can be optimized. Good temperature control enables the proton exchange membrane to maintain good proton conductivity, and at the same time ensures that the catalyst activity is maintained at a relatively high level, thereby improving the reaction efficiency of hydrogen and oxygen and enhancing the output power and energy efficiency of the fuel cell.

[0061] In this application, by controlling the rotation speed of the fan and adopting a closed-loop control method, the temperature control characteristics of the radiator coolant are assisted in adjustment, and a better fuel cell temperature adjustment effect is achieved in cooperation with the thermostat, avoiding safety accidents such as hydrogen leakage, battery combustion, or even explosion that may occur when the fuel cell temperature is too high. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 is a flowchart of a fuel cell engine thermal management calibration method provided by one or more embodiments of the present invention.

[0063] Figure 2It is a structural diagram of a fuel cell engine thermal management calibration device provided by one or more embodiments of the present invention.

[0064] Figure 3 Schematic diagram of a fuel cell engine thermal management system according to a specific embodiment of the present invention.

[0065] Figure 4 Block diagram of an electronic device for a method of a fuel cell engine thermal management calibration device provided by one or more embodiments of the present invention.

[0066] Reference numerals in the drawings: 1. Expansion tank; 2. Coolant filter; 3. Fuel cell stack; 4. Water-air intercooler; 5. Hydrogen heat exchanger; 6. Deionizer; 7. Radiator; 8. High-pressure electric water pump; 9. Low-pressure electric water pump; 10. PTC heater; 11. Water-hydrogen separator; 12. Warm air; 13. Fuel cell stack outlet temperature sensor; 14. Pressure sensor; 15. Fuel cell stack inlet temperature sensor; 16. Radiator inlet temperature sensor. Detailed implementation manners

[0067] Next, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0068] Figure 1 It is a flowchart of a fuel cell engine thermal management calibration method provided by one or more embodiments of the present invention.

[0069] As Figure 1 shown, the fuel cell engine thermal management calibration method includes:

[0070] Step S1, select an environmental chamber set on the engine test bench, obtain the environmental temperature and humidity inside the environmental chamber, and make the environmental temperature and humidity inside the environmental chamber within a preset range;

[0071] Step S2, place the fuel cell engine and the heat dissipation device in the environmental chamber;

[0072] Step S3, obtain the environmental temperature and humidity range of the environmental chamber, after standing the fuel cell engine and the heat dissipation device for a set time, run the engine;

[0073] Step S4, adjust the operating conditions of the fuel cell engine, according to the operating conditions of the fuel cell engine, obtain an adjusted temperature control strategy, and obtain key thermal management parameters;

[0074] Step S5, set an environmental temperature range in the environmental chamber, and obtain the deviation between the key management parameters of thermal management and the set temperature according to the adjusted fuel cell engine operating conditions.

[0075] Step S6, apply the adjusted temperature control strategy to the entire vehicle for verification and generate vehicle temperature control parameters.

[0076] Step S7, obtain the calibration parameters of the conventional engine thermal management.

[0077] Step S8, compare and judge the vehicle temperature control parameters with the calibration parameters of the conventional engine thermal management.

[0078] In this embodiment, Step S1 includes:

[0079] Obtain the preset calibration time of the test bench.

[0080] Obtain the key management parameters of thermal management according to the preset calibration time of the test bench.

[0081] The key management parameters of thermal management include: the inlet temperature of the fuel cell stack, the outlet temperature of the fuel cell stack, the inlet temperature of the radiator, the outlet temperature of the radiator, the inlet pressure of the fuel cell, and the target inlet temperature of the fuel cell stack.

[0082] Specifically, in this embodiment, the selected environmental chamber refers to selecting a fuel cell engine test bench and an environmental chamber that meet the heat dissipation requirements for the operation of the fuel cell engine used in the test. For in-cabin heat dissipation, it is necessary to ensure that the deviation between the temperature in the environmental chamber and the set temperature does not exceed ±1°C, and the deviation between the humidity in the environmental chamber and the set humidity does not exceed ±5%RH.

[0083] Among them, in this embodiment, by obtaining the calibration cycle of the fuel cell generator, the key management parameters related to thermal management are monitored in real time during the calibration cycle of the fuel cell generator and fed back to the electronic control unit in a timely manner.

[0084] In this embodiment, Step S2 includes: arranging a heat dissipation device, placing the fuel cell engine used in the test and the heat dissipation device in the environmental chamber, ensuring that all pipeline connections are tight, and the communication between the electronic control unit and the upper computer of the test bench is normal.

[0085] In this embodiment, Step S3 includes: setting the temperature and humidity in the environmental chamber to the selected normal temperature condition, with a temperature of 25°C and a humidity of 50%. Keep the engine in this environment for more than 12 hours, and then start the engine. After the engine is stable, adjust the calibration parameters.

[0086] Specifically, selecting the normal temperature condition provides a relatively stable and standard test basis for engine testing, reducing the interference of environmental factors on the engine thermal management calibration cycle. By standing still, the internal temperature of the engine is fully cooled to the temperature set in the environmental chamber. At the same time, through standing still, the distribution state of the engine internal oil is stabilized, enabling various sensors to fully adapt to the temperature and humidity in the environmental chamber, avoiding measurement errors caused by environmental changes, providing reliable signals for the engine control system, and making the calibration parameter adjustment more accurate.

[0087] In this embodiment, step S4 includes:

[0088] Adjust the fuel cell engine working condition, and according to the fuel cell engine working condition, obtain the adjusted temperature control strategy and the key management parameters of thermal management;

[0089] The adjusted temperature control strategy includes:

[0090] The electronic control unit and the electronic control thermostat;

[0091] Obtain the operating temperature range of the fuel cell stack;

[0092] The electronic control unit receives the key management parameters of thermal management;

[0093] According to the mixing ratio of the electronic control thermostat, generate the mixing strategy of the electronic control thermostat,

[0094] The electronic control unit controls the opening degree of the electronic control thermostat according to the mixing strategy of the electronic control thermostat.

[0095] Among them, adjust the engine working condition, adjust it sequentially from low load to high load conditions, and adjust the radiator speed of the thermostat and the opening degree of the thermostat under each working condition. The principle for selecting the working conditions is selected according to 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100% of the rated power. The more and denser the selected working condition points are, the more accurate the thermal management control is.

[0096] It starts after standing still on the test bench for 12 hours. Currently, the engine is in the cold start phase. The internal temperature of the fuel cell engine tends to the temperature of the environmental chamber. The operating temperature range of the fuel cell stack is 70 - 80°C. When the temperature of the fuel cell stack is lower than 70 - 80°C, the electronic thermostat is controlled by the electronic control unit. The electronic control unit makes the electronic thermostat fully close the large circulation channel according to the key management parameters of thermal management. After the coolant flows out of the fuel cell stack, it passes through components such as the PTC heater. If the vehicle enables the warm air function, part of the coolant will flow through the warm air device to heat the interior of the vehicle using the heat of the coolant, and then the coolant returns to the system circulation. Then it is pumped back into the fuel cell stack by the high-pressure electric water pump, and the coolant forms a relatively small circulation loop between the fuel cell stack and components such as the water pump.

[0097] Through the above stage, the coolant can be quickly heated up, enabling the fuel cell stack to reach the appropriate operating temperature as soon as possible, reducing the preheating time, and avoiding problems such as a decrease in catalyst activity and a reduction in output voltage caused by too low a temperature of the fuel cell stack.

[0098] The fuel cell generates electricity through the electrochemical reaction of hydrogen and oxygen. The pressures of the reactants (hydrogen, air) directly affect the reaction rate and efficiency. The pressure sensor continuously detects the gas pressure (such as hydrogen pressure) at the inlet of the fuel cell stack, providing real-time data for the control system to ensure that the gas enters the fuel cell stack at an appropriate pressure and avoid performance degradation caused by too high or too low pressure.

[0099] Furthermore, when the outlet temperature of the fuel cell stack is lower than the lower limit of the operating temperature range of the fuel cell stack, the opening degree of the electronic thermostat decreases according to the preset control curve, including decreasing to 0%, and the radiator flow rate gradually decreases;

[0100] When the outlet temperature of the radiator is greater than or equal to the upper limit of the operating temperature range of the fuel cell stack, the opening degree of the electronic thermostat increases according to the preset control curve, including increasing to 100%, and the radiator flow rate gradually increases.

[0101] When the key management parameters of thermal management received by the electronic control unit exceed the set temperature (such as higher than 80°C), the electronic control unit controls the electronic thermostat to open the channel to the radiator. After the coolant flows out of the fuel cell stack, it first passes through the deionizer. By removing the ions in the coolant, high-purity, low-conductivity coolant flows into the radiator. In the radiator, the coolant exchanges heat with the outside air. Through methods such as the intake grille air intake and the radiator fan drawing air, the heat is dissipated into the environment, reducing the temperature of the coolant. The cooled coolant then returns to the fuel cell stack through the high-pressure electric water pump again, taking away the excess heat generated by the fuel cell stack reaction. In this way, a larger circulation loop is formed. Through the heat dissipation of the radiator, it is ensured that the fuel cell stack will not have problems affecting performance and safety such as proton exchange membrane dehydration and membrane strength decline due to too high a temperature.

[0102] In this embodiment, after receiving the actual temperature data transmitted by the temperature sensor, the electronic control unit compares it with the operating temperature range of the fuel cell stack and calculates the temperature deviation.

[0103] The hybrid strategy of the electronic thermostat includes: when the outlet temperature of the fuel cell stack is less than the operating temperature range of the fuel cell, the opening of the electronic thermostat is 0%, and the small circulation loop is taken.

[0104] When the temperature value of the radiator outlet is greater than the upper limit of the operating temperature range of the fuel cell stack or the outlet temperature of the fuel cell stack is equal to the coolant temperature of the radiator outlet, the opening of the electronic thermostat is 100%, and the large circulation loop is taken. The electronic thermostat adjusts the opening according to the deviation between the actual mixed temperature of the thermostat and the operating temperature range of the fuel cell stack. When the actual mixed temperature is lower than the lower limit of the operating temperature range of the fuel cell stack, the opening of the electronic thermostat decreases or even closes (the opening is 0%), reducing the coolant flow in the large circulation, allowing more coolant to flow through the small circulation, and enabling the fuel cell stack to warm up as soon as possible; when the actual mixed temperature is higher than the upper limit of the operating temperature range of the fuel cell stack, the opening of the electronic thermostat gradually increases, increasing the coolant flow in the large circulation, allowing more coolant to be cooled by the radiator, and preventing the temperature of the fuel cell stack from being too high.

[0105] Among them, the hybrid ratio of the electronic thermostat is the ratio of the coolant flow in the large circulation (flowing through the radiator) to the small circulation (bypassing the radiator) in the engine cooling system. This ratio is dynamically adjusted by the valve opening of the electronic thermostat to achieve precise temperature control of the engine under different working conditions.

[0106] When the outlet temperature of the fuel cell stack is greater than the operating temperature range of the fuel cell stack and greater than the outlet temperature of the radiator, the hybrid ratio control is entered and the thermostat hybrid ratio is output.

[0107] The calculation process of the hybrid ratio of the electronic thermostat is: the ratio of the difference between the target temperature at the inlet of the fuel cell stack and the outlet temperature of the fuel cell stack to the difference between the coolant temperature at the outlet of the radiator and the outlet temperature of the fuel cell stack. According to the thermostat hybrid ratio, the thermostat opening setting value chart (see Table 1) is calculated to calculate the thermostat opening setting value based on the thermostat hybrid ratio.

[0108] Table 1 Corresponding relationship between thermostat hybrid ratio and thermostat opening setting

[0109]

[0110] The electronic control unit controls the opening value of the electronically controlled thermostat according to the mixture ratio of the electronically controlled thermostat. After receiving the opening signal output by the electronic control unit, the electronically controlled thermostat adjusts the opening of the valve according to the mixture ratio of the thermostat. When the mixture ratio is larger, the valve opening increases, the flow rate of the coolant through the large circulation increases, and more heat is dissipated into the environment; when the mixture ratio is smaller, the valve opening decreases, the flow rate of the coolant through the large circulation decreases, and the heat dissipation decreases, thereby realizing the opening adjustment of the coolant flow rate.

[0111] With the adjustment of the coolant flow rate, the temperature of the fuel cell stack will change. The temperature sensor continues to monitor the temperature in real time and feeds back the new actual temperature data to the electronic control unit. The electronic control unit calculates the temperature deviation again and repeats the above steps of calculation, generation and output of the opening signal, and adjustment of the thermostat valve opening, forming a closed-loop control circuit to keep the temperature of the fuel cell stack always stable within the optimal operating temperature range.

[0112] Specifically, according to the opening adjustment of the electronically controlled thermostat, the circulation path and flow rate of the coolant can be precisely adjusted according to the actual working conditions and requirements of the engine, so that the engine is always within the optimal operating temperature range, while maintaining a stable working temperature, reducing the thermal stress of each component of the fuel cell engine, reducing wear, and prolonging the service life of the fuel cell engine. By precisely adjusting the temperature, the fuel cell engine operates in the efficient range, reducing energy loss.

[0113] Among them, by adjusting the coolant flow rate, overcooling is avoided, the working load of components such as the water pump is reduced, the overall efficiency of the cooling system is improved, and the energy consumption is reduced.

[0114] Specifically, according to the above calculation method, the opening setting value of the thermostat is continuously adjusted on the test bench so that the setting value satisfies the stability of the inlet water temperature of the fuel cell stack under different working conditions. The temperature difference (the difference between the set value and the actual value of the inlet water temperature of the fuel cell stack) is less than ±1°C under stable working conditions, and less than ±3°C under transient working conditions.

[0115] In this embodiment, step S4 further includes:

[0116] The adjustment of the temperature control strategy further includes:

[0117] Fan speed regulation;

[0118] The electronic control unit adjusts according to the key thermal management parameters.

[0119] In this embodiment, step S4 includes:

[0120] The electronic control unit sets the initial value of the fan speed according to the key thermal management parameters;

[0121] Obtain the target temperature at the fuel cell inlet, and generate a closed-loop control result value according to the difference between the target temperature and the actual temperature;

[0122] Generate the final fan control value according to the initial fan speed value and the closed-loop control result value.

[0123] Specifically, by controlling the fan speed and adopting a closed-loop control method, the temperature control characteristics of the radiator coolant are assisted to be adjusted, and a better fuel cell temperature adjustment effect is achieved by cooperating with the thermostat, so as to avoid safety accidents such as hydrogen leakage, battery combustion or even explosion that may occur when the fuel cell temperature is too high.

[0124] In this embodiment, step S6 includes: applying the adjusted temperature control strategy to the whole vehicle for verification to generate the whole vehicle temperature control parameters;

[0125] In this embodiment, step S7 includes: saving data, saving the calibrated parameters adjusted above into the electronic control unit, and preparing for actual road test verification on the whole vehicle.

[0126] In this embodiment, step S8 includes: comparing and judging the whole vehicle temperature control parameters with the conventional engine thermal management calibration parameters. Verify the deviation between the fuel cell stack inlet temperature and the radiator outlet temperature and the set temperature.

[0127] In the prior art, the opening degree of the engine thermostat carried by the vehicle is determined according to the radiator outlet water temperature and the actual current to obtain the initial value of the thermostat opening degree, and the opening degree of the thermostat is adjusted in a closed loop according to the difference between the target temperature and the actual temperature of the coolant at the fuel cell stack inlet, and finally the opening degree of the thermostat is determined. The fan speed adjustment is set according to the actual current and the radiator outlet temperature, and no closed-loop adjustment is performed.

[0128] During the road test on the whole vehicle and the thermal management calibration of the fuel cell engine, due to the influence of the battery SOC, the power of the fuel cell engine is uncontrollable, so the calibration period is very long. Record data, including the calibration duration, the deviation of the fuel cell stack inlet temperature, the deviation of the radiator outlet temperature, etc.

[0129] Table 2 Comparison of test results

[0130]

[0131] Through the comparison of test results, the advancement and accuracy of the present invention are proved, which provides an advanced guiding method for the future fuel cell engine thermal management calibration work, and greatly saves the product development cycle and cost.

[0132] Figure 2 It is the structural block diagram of the fuel cell engine thermal management calibration device provided by one or more embodiments of the present invention.

[0133] As Figure 2 shown, the fuel cell engine thermal management calibration device includes: a test bench module, an environmental chamber module, a fuel cell engine operating condition adjustment module, a temperature sampling module, and an adjusted temperature control module;

[0134] The test bench module is used to provide a test platform for the fuel cell engine to be tested;

[0135] The environmental chamber module is used to provide an adjustable temperature and humidity environment for the fuel cell engine to be tested and the heat dissipation system;

[0136] The fuel cell engine operating condition adjustment module is used to provide adjustable fuel cell engine operating conditions during the test;

[0137] The temperature sampling module is used to collect the temperature changes during the test;

[0138] The adjusted temperature control module is used to adjust the operating temperature of the fuel cell under the fuel cell engine operating conditions.

[0139] It should be noted that although this system only discloses the test bench module, the environmental chamber module, the fuel cell engine operating condition adjustment module, the temperature sampling module, and the adjusted temperature control module, it does not mean that this device is only limited to the above basic functional modules. On the contrary, what the present invention intends to express is that on the basis of the above basic functional modules, those skilled in the art can arbitrarily add one or more functional modules in combination with the existing technology to form an infinite number of embodiments or technical solutions. That is to say, this system is open rather than closed, and it cannot be considered that the protection scope of the claims of the present invention is limited to the above disclosed basic functional modules just because this embodiment only discloses individual basic functional modules.

[0140] Figure 3 Schematic diagram of a fuel cell engine thermal management system according to a specific embodiment of the present invention.

[0141] In a specific embodiment, a fuel cell engine thermal management system is disclosed, and the operation process of this system is as follows:

[0142] Startup and low temperature state:

[0143] Initial circulation stage: When the system starts up, the high-pressure electric water pump starts to work, pushing the coolant to circulate in the system. Since the temperature of the fuel cell stack is relatively low, the thermostat is in a closed or small opening state, and the coolant does not pass through the radiator but undergoes a small circulation.

[0144] Heating and warming-up stage: The coolant flows through the fuel cell stack, the water-hydrogen separator, the PTC heater, and the low-pressure electric water pump in sequence, and then returns to the high-pressure electric water pump.

[0145] If the ambient temperature is extremely low, the PTC heater will turn on to heat the coolant and help the fuel cell stack quickly warm up to the appropriate operating temperature.

[0146] Auxiliary component preheating stage: Part of the coolant will pass through the hydrogen heat exchanger to preheat the hydrogen entering the fuel cell stack to the appropriate reaction temperature; the preheated hydrogen then passes through the fuel cell stack.

[0147] Normal operation and high-temperature state:

[0148] Temperature monitoring and adjustment stage: As the fuel cell stack generates heat during operation, the coolant temperature gradually rises. Temperature sensors installed at key positions in the system (such as the fuel cell stack outlet, radiator inlet, etc.) will monitor the temperature in real time and feedback the signal to the vehicle's electronic control unit. When the coolant temperature reaches a certain value (such as exceeding the upper limit of the appropriate operating temperature of the fuel cell stack), the electronic control unit controls the opening of the electronic thermostat to increase.

[0149] Large-circulation heat dissipation stage: Part of the coolant continues to circulate in a small loop, and the other part starts to enter the large loop. The large-loop path is as follows: The coolant flows through the thermostat to the radiator, where it exchanges heat with the outside air to reduce the temperature, and then flows back to the high-pressure electric water pump. At the same time, the coolant passes through the water-air intercooler to cool the air entering the fuel cell stack, improving the reaction efficiency of the fuel cell stack; when passing through the coolant filter, impurities are filtered to keep the coolant clean.

[0150] Dynamic balance maintenance stage: During the entire operation process, the system continuously and dynamically adjusts the opening of the electronic thermostat, the working state of the PTC heater, and the speed of the high-pressure electric water pump according to factors such as the fuel cell stack temperature and ambient temperature to ensure that the fuel cell stack is always within the appropriate operating temperature range and guarantee the stable and efficient operation of the fuel cell system.

[0151] During the system operation, the hydrogen heat exchanger continuously adjusts the hydrogen temperature to ensure that the hydrogen entering the fuel cell stack is at the appropriate reaction temperature and improve the performance of the fuel cell stack.

[0152] If the vehicle enables the warm air function, part of the coolant will flow through the warm air device to heat the interior of the vehicle using the heat of the coolant, and then the coolant will return to the system for circulation.

[0153] Figure 4 A block diagram of the structure of an electronic device for the fuel cell engine thermal management calibration device method provided by one or more embodiments of the present invention.

[0154] As Figure 4 shown, the present application provides an electronic device, including: a processor, a communication interface, a memory, and a communication bus, where the processor, the communication interface, and the memory complete communication with each other through the communication bus;

[0155] A computer program is stored in a memory. When the computer program is executed by a processor, the processor is caused to execute the steps of the method of the fuel cell engine thermal management calibration device.

[0156] This application also provides a computer-readable storage medium, which stores a computer program executable by an electronic device. When the computer program runs on the electronic device, the electronic device is caused to execute the steps of the method of the fuel cell engine thermal management calibration device.

[0157] This application also provides a test platform, including:

[0158] An electronic device for implementing the steps of the method of the fuel cell engine thermal management calibration device;

[0159] A processor that runs a program. When the program runs, it executes the steps of the method of the fuel cell engine thermal management calibration device based on the data output from the electronic device;

[0160] A storage medium for storing a program that, when running, executes the steps of the method of the fuel cell engine thermal management calibration device for the data output from the electronic device.

[0161] For the method embodiments, for simplicity of description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the embodiments of the present invention are not limited by the described action sequence, because according to the embodiments of the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily essential to the embodiments of the present invention.

[0162] From the description of the above embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments or some parts of the embodiments of this application.

[0163] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for calibrating the thermal management of a fuel cell engine, characterized in that, The fuel cell engine thermal management calibration method includes: Step S1: Select an environmental chamber installed on the engine test bench, obtain the environmental temperature and humidity inside the environmental chamber, and make the environmental temperature and humidity inside the environmental chamber within a preset range; Step S2: Place the fuel cell engine and the heat dissipation device inside the environmental chamber; Step S3: Obtain the environmental temperature and humidity range of the environmental chamber. After the fuel cell engine and the heat dissipation device are static for a set time, start the engine; Step S4: Adjust the operating conditions of the fuel cell engine. According to the operating conditions of the fuel cell engine, obtain an adjusted temperature control strategy and obtain key thermal management parameters; Step S5: Set an environmental temperature range inside the environmental chamber. According to the adjusted operating conditions of the fuel cell engine, obtain the deviation between the key thermal management parameters and the set temperature; Step S6: Apply the adjusted temperature control strategy to the whole vehicle for verification and generate vehicle temperature control parameters; Step S7: Obtain conventional engine thermal management calibration parameters; Step S8: Compare and judge the vehicle temperature control parameters with the conventional engine thermal management calibration parameters.

2. The fuel cell engine thermal management calibration method according to claim 1, wherein Step S1 further includes: Obtain the preset calibration time of the test bench; Obtain key thermal management parameters according to the preset calibration time of the test bench; The key thermal management parameters include: the inlet temperature of the fuel cell stack, the outlet temperature of the fuel cell stack, the inlet water temperature of the radiator, the outlet water temperature of the radiator, the inlet pressure of the fuel cell, the target inlet temperature of the fuel cell stack, and the radiator flow rate.

3. The fuel cell engine thermal management calibration method according to claim 2, characterized in that, Step S4 includes: Obtain the operating temperature range of the battery stack; Obtain the mixing ratio of the electronic thermostat; Generate an electronic thermostat mixing strategy according to the mixing ratio of the electronic thermostat and the key thermal management parameters; Control the opening of the electronic thermostat according to the electronic thermostat mixing strategy.

4. The fuel cell engine thermal management calibration method according to claim 3, wherein The adjusted temperature control strategy further includes: When the outlet temperature of the fuel cell stack is less than the lower limit of the operating temperature range of the battery stack, the opening of the electronic thermostat is reduced according to a preset control curve, including reducing to 0%, and the radiator flow rate gradually decreases; When the outlet temperature of the radiator is greater than or equal to the upper limit of the operating temperature range of the battery stack, the opening of the electronic thermostat is increased according to a preset control curve, including increasing to 100%, and the radiator flow rate gradually increases.

5. The fuel cell engine thermal management calibration method according to claim 1, characterized in that The adjusted temperature control strategy further includes: Fan speed adjustment; The electronic control unit adjusts according to the key thermal management parameters.

6. The fuel cell engine thermal management calibration method according to claim 5, characterized in that: The electronic control unit sets the initial value of the fan speed according to the key thermal management parameters; Obtain the target temperature at the fuel cell inlet, and generate a closed-loop control result value according to the difference between the target temperature and the actual temperature; Generate the final fan control value according to the initial value of the fan speed and the closed-loop control result value.

7. A fuel cell engine thermal management calibration device, characterized in that, The fuel cell engine thermal management calibration device includes: a test bench module, an environmental chamber module, an electronic control unit module, a fuel cell engine operating condition adjustment module, a temperature sampling module, and an adjusted temperature control module; The bench module is used to provide a test platform for the fuel cell engine to be tested; The environmental chamber module is used to provide an adjustable temperature and humidity environment for the fuel cell engine to be tested and the heat dissipation system; The fuel cell engine operating condition adjustment module is used to provide adjustable fuel cell engine operating conditions during the test; The temperature sampling module is used to collect the temperature changes during the test; The adjusted temperature control module is used to adjust the operating temperature of the fuel cell under the fuel cell engine operating conditions; Among them, the adjusted temperature control module includes: an electronic thermostat; The electronic control unit module is used to receive the key management parameters of the thermal management; The electronic thermostat is used to generate the electronic thermostat mixing ratio; The electronic control unit controls the opening degree of the electronic thermostat according to the electronic thermostat mixing strategy.

8. An electronic device, characterized in that, It includes: A processor, a communication interface, a memory, and a communication bus. Among them, the processor, the communication interface, and the memory complete mutual communication through the communication bus; The memory stores a computer program. When the computer program is executed by the processor, the processor executes the steps of the fuel cell engine thermal management calibration method described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, It stores a computer program executable by an electronic device. When the computer program runs on the electronic device, the electronic device executes the steps of the fuel cell engine thermal management calibration method described in any one of claims 1 to 6.

10. A detection platform, characterized in that, It includes: An electronic device is used to implement the steps of the fuel cell engine thermal management calibration method described in any one of claims 1 to 6; A processor, and the processor runs a program. When the program runs, it executes the steps of the fuel cell engine thermal management calibration method described in any one of claims 1 to 6 for the data output from the electronic device; A storage medium is used to store a program. When the program runs, it executes the steps of the fuel cell engine thermal management calibration method described in any one of claims 1 to 6 for the data output from the electronic device.

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