Coolant loop temperature control method and device and terminal equipment

Abstract

The invention provides a coolant loop temperature control method and device and terminal equipment. The method comprises the steps that the current stage in the temperature rising process of a coolant loop is obtained; when the current stage is the warm-up water mixing stage, the coolant loop temperature is controlled in an open loop mode; when the current stage is a low-current-density stage, adopting a closed loop to control the temperature of the coolant loop; and when the current stage is the normal operation current density stage, the temperature of the coolant loop is controlled in an open-loop and closed-loop combined mode. According to the method, temperature changes of different stages of the coolant loop of the fuel cell system are dynamically decomposed, and stage temperature control is performed in a targeted manner, so that the coolant temperature of the fuel cell system has the advantages of high environmental adaptability, accurate temperature control, high response speed, prolonged service life of the fuel cell system and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of coolant loops of fuel cell systems, and in particular to a coolant loop temperature control method, device and terminal equipment. Background Art

[0002] The coolant circuit of the fuel cell system is mainly composed of water pump, cooling fan, electronic thermostat, PTC heater, coolant inlet temperature and pressure integrated sensor, coolant outlet temperature and pressure integrated sensor and other components. In the warm-up stage, due to the opening of the electronic thermostat, the temperature changes greatly during the large and small circulation water mixing stage, and the dynamic adjustment time is long; in the case of low power density, due to the low power of the battery stack and the less heat generated, there is a large deviation between the temperature setting value and the actual value; in the case of medium and high power density, since both the electronic thermostat and the cooling fan have an impact on the temperature, there will be a certain degree of coupling, and the electronic thermostat and the cooling fan need to be decoupled and controlled.

[0003] In response to the above technical problems, the traditional fuel cell system cooling circuit temperature control adopts a single temperature closed-loop control method, which can achieve relatively good temperature control effect at a specific electrical density point. However, due to the large hysteresis of temperature changes, the coupling of component functions, and the great influence of seasonal temperature changes, it cannot have good environmental adaptability.

[0004] In view of the above technical problems, the present invention provides a coolant loop temperature control method, device and terminal equipment. Summary of the invention

[0005] The purpose of the present invention is to provide a coolant loop temperature control method, device and terminal equipment, so that the coolant temperature of the fuel cell system has the advantages of strong environmental adaptability, accurate temperature control, fast response speed, and increased service life of the fuel cell system.

[0006] Specifically, the technical solution provided by the present invention is as follows:

[0007] The present invention provides a coolant circuit temperature control method, which is applied to a coolant circuit of a fuel cell system, wherein an electronic thermostat and a heat dissipation device are arranged between the coolant circuits, comprising:

[0008] Obtaining a current stage of the coolant circuit heating process;

[0009] When the current stage is the warm-up water mixing stage, the coolant circuit temperature is controlled in an open loop, and under the open loop control, the opening value of the electronic thermostat is open-loop controlled according to the actual value of the stack inlet temperature of the coolant circuit;

[0010] When the current stage is a low-electricity stage, the coolant circuit temperature is controlled in a closed loop. Under the closed loop control, the opening value of the electronic thermostat is controlled in a closed loop according to the difference between the target value of the coolant circuit entering the stack temperature and the actual value of the coolant circuit entering the stack temperature;

[0011] When the current stage is the normal operating electrical tightness stage, the coolant circuit temperature is controlled jointly by open-loop and closed-loop. Under the open-loop and closed-loop joint control, the opening value of the electronic thermostat is firstly open-loop controlled according to the actual value of the stack entering temperature of the coolant circuit. When the electronic thermostat is in the fully open state, the heat dissipation device is turned on, and the heat dissipation device is closed-loop controlled according to the difference between the target value of the stack entering temperature of the coolant circuit and the actual value of the stack entering temperature of the coolant circuit.

[0012] In the above-mentioned embodiment, the temperature changes of the coolant loop of the fuel cell system at different stages are dynamically decomposed, and stage temperature control is performed in a targeted manner. The open-loop control of the coolant loop temperature is adopted in the warm-up and water mixing stage, which can effectively reduce temperature fluctuations. The closed-loop control of the coolant loop temperature is adopted in the low-electrical density stage to ensure the temperature required for the normal operation of the fuel cell. The open-loop and closed-loop combined control of the coolant loop temperature is adopted in the normal operation stage, which can effectively decouple the control effects of the electronic thermostat and the heat dissipation device, overcome the hysteresis of temperature changes, increase the accuracy and rapidity of the coolant loop temperature control of the fuel cell system, and improve the service life of the fuel cell system.

[0013] In some embodiments, obtaining the current stage of the coolant loop heating process includes:

[0014] When it is detected that the coolant inlet temperature does not reach the first preset temperature, the warm-up water mixing stage is entered;

[0015] When it is detected that the coolant inlet temperature reaches the first preset temperature, entering the low-electricity stage;

[0016] When it is detected that the coolant inlet temperature reaches a second preset temperature, the normal operation electrical tightness stage is entered, and the first preset temperature is lower than the second preset temperature.

[0017] In the above-mentioned embodiment, the determination of each stage in the temperature rising process is specifically described to facilitate the subsequent targeted stage temperature control.

[0018] In some embodiments, the open-loop control of the opening value of the electronic thermostat according to the actual value of the stack inlet temperature of the coolant circuit includes:

[0019] Acquire the corresponding relationship between the actual value of the stack inlet temperature of the coolant circuit and the opening value of the electronic thermostat through simulation;

[0020] According to the corresponding relationship, a mapping table is established with the actual value of the stack inlet temperature of the coolant circuit as the horizontal axis and the opening value of the electronic thermostat as the vertical axis;

[0021] The mapping table is used to control the opening value of the electronic thermostat according to the actual value of the stack inlet temperature of the coolant circuit.

[0022] In the above embodiment, the opening value of the electronic thermostat is controlled by looking up the table according to the actual value of the stack inlet temperature of the coolant loop. The electronic thermostat gathers heat, which can effectively reduce temperature fluctuations and increase the rapidity of the temperature control of the coolant loop of the fuel cell system.

[0023] In some embodiments, before the closed-loop control of the opening value of the electronic thermostat according to the difference between the target value of the coolant circuit entering the stack temperature and the actual value of the coolant circuit entering the stack temperature, the method further includes:

[0024] Acquiring the loading current of the fuel cell system in real time;

[0025] The opening value of the electronic thermostat is pre-adjusted according to the change amplitude of the loading current.

[0026] In the above embodiment, the opening value of the electronic thermostat is pre-adjusted before the electronic thermostat is closed-loop controlled according to the difference between the target value of the stack entry temperature and the actual value of the stack entry temperature, which can effectively overcome the hysteresis of temperature change.

[0027] In some embodiments, the closed-loop control of the opening value of the electronic thermostat according to the difference between the target value of the coolant circuit entering the stack temperature and the actual value of the coolant circuit entering the stack temperature further includes:

[0028] Acquiring the actual value of the inlet temperature of the coolant loop in real time;

[0029] Obtaining a corresponding target value of the stack temperature of the coolant circuit by looking up the table according to the loading current;

[0030] Calculating the difference between the target value of the coolant circuit entering the stack and the actual value of the coolant circuit entering the stack at the same time;

[0031] The opening value of the electronic thermostat is controlled according to the difference.

[0032] In the above embodiment, the electronic thermostat is closed-loop controlled according to the difference between the target value of the stack temperature and the actual value of the stack temperature, which can ensure the temperature required for the normal operation of the fuel cell and increase the accuracy and rapidity of the temperature control of the coolant loop of the fuel cell system.

[0033] In some embodiments, the closed-loop control of the heat dissipation device according to the difference between the target value of the coolant circuit entering the stack temperature and the actual value of the coolant circuit entering the stack temperature includes:

[0034] The rotation speed of the heat sink is controlled by a closed loop.

[0035] In the above embodiment, when the current stage is the normal operation electrical tightness stage, the opening value of the electronic thermostat is controlled by looking up the table according to the actual value of the stack entering temperature of the coolant circuit. When the electronic thermostat is in the fully open state, the heat dissipation device is turned on, and the speed of the heat dissipation device is closed-loop controlled according to the difference between the stack entering temperature target value and the actual value of the stack entering temperature of the coolant circuit, which can effectively decouple the control effects of the electronic thermostat and the heat dissipation device.

[0036] The present invention also provides a coolant circuit temperature control device, which is applied to a coolant circuit of a fuel cell system, wherein an electronic thermostat and a heat dissipation device are arranged between the coolant circuits, and comprises:

[0037] An acquisition module, used for acquiring the current stage of the coolant circuit temperature increase process;

[0038] A warm-up water mixing control module, used to control the coolant circuit temperature in an open loop when the current stage is the warm-up water mixing stage, and to control the opening value of the electronic thermostat in an open loop according to the actual value of the stack inlet temperature of the coolant circuit under the open loop control;

[0039] A low-electricity density control module, used for, when the current stage is the low-electricity density stage, adopting a closed-loop control on the temperature of the coolant circuit, and under the closed-loop control, controlling the opening value of the electronic thermostat in a closed-loop manner according to the difference between the target value of the coolant circuit entering the stack temperature and the actual value of the coolant circuit entering the stack temperature;

[0040] The normal operation electrical density control module is used to control the coolant circuit temperature by open-loop and closed-loop combined control when the current stage is the normal operation electrical density stage. Under the open-loop and closed-loop combined control, the opening value of the electronic thermostat is firstly open-loop controlled according to the actual value of the stack entering temperature of the coolant circuit. When the electronic thermostat is in the fully open state, the heat dissipation device is turned on, and the heat dissipation device is closed-loop controlled according to the difference between the target value of the stack entering temperature of the coolant circuit and the actual value of the stack entering temperature of the coolant circuit.

[0041] In the above-mentioned embodiment, the current stage of the coolant loop heating process is obtained through the acquisition module. When the current stage is the warm-up water mixing stage, the coolant loop temperature is open-loop controlled by the warm-up water mixing control module, which can effectively reduce temperature fluctuations; when the current stage is the low-electrical density stage, the coolant loop temperature is closed-loop controlled by the low-electrical density control module to ensure the temperature required for the normal operation of the fuel cell; when the current stage is the normal operating electric density stage, the coolant loop temperature is jointly controlled by the normal operating electric density control module in open and closed loops, which can effectively decouple the control effects of the electronic thermostat and the heat dissipation device, overcome the hysteresis of temperature changes, increase the accuracy and rapidity of the coolant loop temperature control of the fuel cell system, and improve the service life of the fuel cell system.

[0042] In some implementations, the warm-up water mixing control module includes:

[0043] A simulation acquisition unit, used for acquiring the corresponding relationship between the actual value of the stack inlet temperature of the coolant circuit and the opening value of the electronic thermostat through simulation;

[0044] A mapping table establishment unit is used to establish a mapping table according to the corresponding relationship by taking the actual value of the stack inlet temperature of the coolant circuit as the horizontal axis and the opening value of the electronic thermostat as the vertical axis;

[0045] A table lookup control unit is used to control the opening value of the electronic thermostat by looking up the table according to the actual value of the stack inlet temperature of the coolant circuit through the mapping table.

[0046] In the above-mentioned embodiment, the correspondence between the actual value of the stack entry temperature of the coolant loop and the opening value of the electronic thermostat is obtained through simulation and a table is generated. The opening value of the electronic thermostat is controlled by looking up the table according to the actual value of the stack entry temperature, so as to realize open-loop control of the coolant loop temperature, which can effectively reduce temperature fluctuations and increase the rapidity of the coolant loop temperature control of the fuel cell system.

[0047] In some embodiments, the low electrical density control module includes:

[0048] A real-time acquisition unit, used for acquiring the actual value of the stack inlet temperature of the coolant loop in real time;

[0049] A table lookup acquisition unit, configured to obtain a corresponding target value of the stack temperature of the coolant circuit according to the loading current;

[0050] A difference calculation unit, used for calculating the difference between the target value of the coolant circuit entering the stack and the actual value of the coolant circuit entering the stack at the same time;

[0051] A control unit is used to control the opening value of the electronic thermostat according to the difference.

[0052] In the above embodiment, the difference between the target value of the coolant loop temperature entering the stack and the actual value of the temperature entering the stack is calculated, and the opening value of the electronic thermostat is controlled according to the difference to achieve closed-loop control of the coolant loop temperature, which can ensure the temperature required for the normal operation of the fuel cell in the low-electricity stage.

[0053] The present invention also provides a terminal device for coolant circuit temperature control, the terminal comprising a processor, a memory connected to the processor, and program instructions stored in the memory, and when the processor executes the program instructions, the coolant circuit temperature control method as described in any one of the above items is implemented.

[0054] Compared with the prior art, the present invention has the following beneficial effects:

[0055] The coolant loop temperature control method, device and terminal equipment provided by the present invention can perform targeted stage temperature control on the coolant loop of the fuel cell system, increase the environmental adaptability of the coolant loop temperature of the fuel cell system, and increase the accuracy and speed of the coolant loop temperature control of the fuel cell system. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The preferred implementation scheme will be described below in a clear and understandable manner in conjunction with the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of a coolant circuit temperature control method, device and terminal device.

[0057] Figure 1 It is a schematic diagram of the overall structure of a fuel cell coolant circuit used in a coolant circuit temperature control method of the present invention;

[0058] Description of the accompanying drawings: 1-water pump, 2-cooling fan, 3-electronic thermostat, 4-PTC heater, 5-deionizer, 6-coolant inlet temperature and pressure integrated sensor, 7-coolant outlet temperature and pressure integrated sensor;

[0059] Figure 2 is a flow chart of an embodiment of a coolant circuit temperature control method of the present invention;

[0060] Figure 3 is a flow chart of another embodiment of a coolant circuit temperature control method of the present invention;

[0061] Figure 4 is a flow chart of another embodiment of a coolant circuit temperature control method of the present invention;

[0062] Figure 5 It is a structural schematic diagram of an embodiment of a coolant circuit temperature control device of the present invention.

[0063] Description of the accompanying figures: acquisition module 10, warm-up water mixing control module 20, low electrical density control module 30, normal operation electrical density control module 40, simulation acquisition unit 21, mapping table establishment unit 22, table lookup control unit 23, real-time acquisition unit 31, table lookup acquisition unit 32, difference calculation unit 33, control unit 34. DETAILED DESCRIPTION

[0064] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0065] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections.

[0066] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0067] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0068] In one embodiment, the present application provides a coolant circuit temperature control method, which is applied to a fuel cell system coolant circuit. The fuel cell system coolant circuit is shown in the accompanying drawings of the specification. Figure 1 ,include:

[0069] 1-The water pump is the core component of the fuel cell system cooling system. By changing the coolant flow, it controls the temperature of the fuel cell stack and keeps the operating temperature of the fuel cell stack within a relatively suitable range; 2-The cooling fan transfers the heat of the coolant to the environment to reduce the temperature of the coolant; 3-The electronic thermostat has one inlet and two outlets. The opening of the regulating valve can adjust the ratio of the liquid flow through the two outlets, thereby playing the role of allocating the flow to the large and small cycles, and plays an important role in the precise temperature control of the fuel cell cooling system; when the regulating valve of the electronic thermostat is closed, the coolant is controlled not to flow through the cooling fan; when the regulating valve of the electronic thermostat is opened, the coolant is controlled to flow through the cooling fan; when the regulating valve of the electronic thermostat is in the fully open state, the coolant is controlled to flow only through the cooling fan, and the cooling fan is turned on to achieve the effect of heat dissipation. 4-The PTC heater is composed of PTC ceramic heating elements and aluminum tubes. This type of PTC heating element has the advantages of small thermal resistance and high heat exchange efficiency. It is an automatic constant temperature and power-saving electric heater. 5-The deionizer is mainly used to remove conductive ions from the coolant. During the operation of the fuel cell, a high voltage will be generated on the bipolar plate, but at the same time, this high voltage is not transmitted to the entire cooling circulation channel through the coolant in the middle of the bipolar plate, so the coolant is required to be non-conductive. 6-Coolant inlet stack temperature and pressure integrated sensor and 7-Coolant outlet temperature and pressure integrated sensor are used to detect the circulating water temperature in and out of the stack and the pressure of the coolant entering and leaving the stack. The temperature and pressure integrated sensor combines the double-layer characteristics of the temperature sensor and the pressure sensor, and can measure both temperature and pressure. Its structural design is generally to add a temperature sensor probe under the pressure sensor. The temperature and pressure integrated sensor generally has a four-wire output, and the temperature signal and pressure signal are output separately, which helps to analyze the signals separately.

[0070] In one embodiment, referring to the accompanying drawings Figure 2 The present application provides a coolant circuit temperature control method, which is applied to a coolant circuit of a fuel cell system, wherein an electronic thermostat and a heat dissipation device are provided between the coolant circuits, including:

[0071] S101 obtains the current stage of the coolant circuit heating process;

[0072] Specifically, the coolant loop characteristics of the fuel cell system are decomposed, and the coolant loop heating process is segmented into the warm-up water mixing stage, the low-electricity density stage, and the normal operation electric density stage. When the fuel cell system starts to heat up, the coolant inlet temperature is first detected. If the temperature reaches the preset temperature, it directly enters the low-electricity density stage closed-loop control. If the temperature does not reach the preset temperature, it enters the warm-up water mixing stage open-loop control, and heat is gathered through the electronic thermostat to effectively reduce temperature fluctuations.

[0073] Temperature and pressure integrated sensors are installed at the coolant inlet and outlet of the fuel cell system to detect the circulating water temperature in and out of the stack and the pressure of the coolant entering and leaving the stack. The temperature and pressure integrated sensor combines the double-layer characteristics of the temperature sensor and the pressure sensor, and can measure both temperature and pressure. Its structural design generally adds a temperature sensor probe under the pressure sensor. The temperature and pressure integrated sensor generally has four-wire output, and the temperature signal and pressure signal are output separately, which helps to analyze the signals separately.

[0074] S102: When the current stage is the warm-up water mixing stage, the coolant circuit temperature is controlled in an open loop. Under the open loop control, the opening value of the electronic thermostat is open-loop controlled according to the actual value of the inlet temperature of the coolant circuit;

[0075] Specifically, when it is detected that the coolant inlet temperature has not reached the first preset temperature, open-loop control is entered in the warm-up water mixing stage; the actual value of the coolant loop's stack inlet temperature is used as the horizontal axis, and the opening value of the electronic thermostat is used as the vertical axis to obtain a set of initial values ​​in advance according to the simulation, and then artificial calibration and modification are performed based on the collected data to establish a mapping table for the two, and the actual value of the coolant stack inlet temperature is used to look up the table to control the opening value of the electronic thermostat, and the electronic thermostat is used to gather heat to avoid the problem of long dynamic adjustment time caused by large temperature changes in the large and small cycle water mixing stages.

[0076] S103: When the current stage is the low-electricity stage, the coolant circuit temperature is controlled in a closed loop. Under the closed loop control, the opening value of the electronic thermostat is controlled in a closed loop according to the difference between the target value of the coolant circuit entering the stack temperature and the actual value of the coolant circuit entering the stack temperature;

[0077] Specifically, when it is detected that the coolant inlet temperature reaches the first preset temperature and does not reach the second preset temperature, the low electric density stage closed-loop control is entered, wherein the second preset temperature is greater than the first preset temperature. The corresponding coolant loop stack temperature target value is obtained by looking up the table according to the real-time loading current of the fuel cell system, and the actual value of the coolant loop stack temperature is detected in real time by the coolant inlet temperature and pressure integrated sensor, and the opening value of the electronic thermostat is controlled according to the difference between the target value and the actual value.

[0078] Before the closed-loop control of the coolant loop temperature, the opening value of the electronic thermostat can be pre-adjusted, and the opening value of the electronic thermostat can be adjusted according to the change amplitude of the loading current of the fuel cell system to effectively overcome the hysteresis of temperature change. For example, when the loading current increases by 1A, the opening value of the electronic thermostat is adjusted by 10%, and the maximum adjustment amplitude is limited to no more than 30% to avoid excessive feedforward effect.

[0079] S104 When the current stage is the normal operation electrical tightness stage, the coolant circuit temperature is controlled by open-loop and closed-loop combined control. Under the open-loop and closed-loop combined control, the opening value of the electronic thermostat is first controlled in open loop according to the actual value of the coolant circuit's stack entry temperature. When the electronic thermostat is in the fully open state, the heat dissipation device is turned on, and the heat dissipation device is closed-loop controlled according to the difference between the coolant circuit's stack entry temperature target value and the coolant circuit's stack entry temperature actual value.

[0080] Specifically, when it is detected that the coolant inlet temperature reaches the second preset temperature, the normal operation electrical tightness stage is entered, and the opening value of the electronic thermostat is controlled by looking up the table using the actual value of the coolant inlet temperature. When the electronic thermostat is in the fully open state, the heat dissipation device is turned on, and the speed of the heat dissipation device is controlled according to the difference between the coolant circuit's inlet temperature target value and the actual value of the inlet temperature.

[0081] In this embodiment, the temperature changes in the coolant loop of the fuel cell system at different stages are dynamically decomposed, and stage temperature control is performed in a targeted manner, which can effectively overcome the hysteresis of temperature changes, increase the accuracy and rapidity of the temperature control of the coolant loop of the fuel cell system, and improve the service life of the fuel cell system.

[0082] In one embodiment, referring to the accompanying drawings Figure 3 The present application provides a coolant circuit temperature control method, which is applied to a coolant circuit of a fuel cell system, wherein an electronic thermostat and a heat dissipation device are provided between the coolant circuits, including:

[0083] S201 obtains the current stage of the coolant circuit heating process;

[0084] Specifically, the coolant loop characteristics of the fuel cell system are decomposed, and the coolant loop heating process is segmented into the warm-up water mixing stage, the low-electricity density stage, and the normal operation electric density stage. When the fuel cell system starts to heat up, the coolant inlet temperature is first detected. If the temperature reaches the preset temperature, it directly enters the low-electricity density stage closed-loop control. If the temperature does not reach the preset temperature, it enters the warm-up water mixing stage open-loop control, and heat is gathered through the electronic thermostat to effectively reduce temperature fluctuations.

[0085] S202: when the current stage is the warm-up water mixing stage, the coolant circuit temperature is controlled by open loop;

[0086] Specifically, when it is detected that the coolant inlet temperature has not reached the preset temperature, open-loop control is entered in the warm-up water mixing stage; the actual value of the coolant loop's stack inlet temperature is used as the horizontal axis, and the opening value of the electronic thermostat is used as the vertical axis to obtain a set of initial values ​​in advance according to the simulation, and then artificial calibration and modification are performed based on the collected data to establish a mapping table for the two, and the actual value of the coolant stack inlet temperature is used to look up the table to control the opening value of the electronic thermostat, and the electronic thermostat is used to gather heat to avoid the problem of long dynamic adjustment time caused by large temperature changes in the large and small cycle water mixing stages.

[0087] S203 obtains the corresponding relationship between the actual value of the inlet temperature of the coolant circuit and the opening value of the electronic thermostat through simulation;

[0088] S204 establishes a mapping table according to the corresponding relationship, with the actual value of the inlet temperature of the coolant circuit as the horizontal axis and the opening value of the electronic thermostat as the vertical axis;

[0089] S205 uses a mapping table to look up the table and control the opening value of the electronic thermostat according to the actual value of the stack inlet temperature of the coolant circuit;

[0090] Specifically, the corresponding relationship between the actual value of the stack temperature and the opening value of the electronic thermostat is obtained through simulation in steps S203 and S204, and a mapping table between the two is established. When it is detected that the coolant inlet temperature does not reach the preset temperature, the warm-up water mixing stage open-loop control is entered, and the opening value of the electronic thermostat is controlled by looking up the table with the actual value of the stack temperature through step S205.

[0091] S206 When the current stage is a low electric density stage, a closed loop is used to control the coolant circuit temperature;

[0092] Specifically, when it is detected that the coolant inlet temperature reaches the preset temperature, the low-electricity-density stage closed-loop control is entered; the corresponding coolant loop inlet temperature target value is obtained by looking up the table according to the real-time loading current of the fuel cell system, and the actual value of the coolant loop inlet temperature is detected in real time by the coolant inlet temperature-pressure integrated sensor, and the opening value of the electronic thermostat is controlled according to the difference between the target value and the actual value.

[0093] S209 When the current stage is the normal operating electrical tightness stage, open-loop and closed-loop combined control of the coolant circuit temperature is adopted.

[0094] Specifically, when the current stage is the normal operating electrical tightness stage, the actual value of the coolant inlet temperature is used to look up the table to control the opening value of the electronic thermostat. When the electronic thermostat is in the fully open state, the heat dissipation device is turned on, and the speed of the heat dissipation device is controlled according to the difference between the target value of the coolant circuit's inlet temperature and the actual value of the inlet temperature.

[0095] In this embodiment, the temperature changes at different stages of the coolant loop of the fuel cell system are dynamically decomposed, and stage temperature control is performed in a targeted manner. In the process of open-loop control of the coolant loop temperature, a mapping relationship between the actual value of the coolant loop's stack inlet temperature and the opening value of the electronic thermostat is established. The opening value of the electronic thermostat is controlled by looking up the table based on the actual value of the coolant loop's stack inlet temperature, thereby effectively reducing temperature fluctuations.

[0096] In one embodiment, referring to the accompanying drawings Figure 3 The present application provides a coolant circuit temperature control method, which is applied to a coolant circuit of a fuel cell system, wherein an electronic thermostat and a heat dissipation device are provided between the coolant circuits, including:

[0097] S201 obtains the current stage of the coolant circuit heating process;

[0098] Specifically, the coolant loop characteristics of the fuel cell system are decomposed, and the coolant loop heating process is segmented into the warm-up water mixing stage, the low-electricity density stage, and the normal operation electric density stage. When the fuel cell system starts to heat up, the coolant inlet temperature is first detected. If the temperature reaches the preset temperature, it directly enters the low-electricity density stage closed-loop control. If the temperature does not reach the preset temperature, it enters the warm-up water mixing stage open-loop control, and heat is gathered through the electronic thermostat to effectively reduce temperature fluctuations.

[0099] S202: when the current stage is the warm-up water mixing stage, the coolant circuit temperature is controlled by open loop;

[0100] Specifically, when it is detected that the coolant inlet temperature has not reached the preset temperature, open-loop control is entered in the warm-up water mixing stage; the actual value of the coolant loop's stack inlet temperature is used as the horizontal axis, and the opening value of the electronic thermostat is used as the vertical axis to obtain a set of initial values ​​in advance according to the simulation, and then artificial calibration and modification are performed based on the collected data to establish a mapping table for the two, and the actual value of the coolant stack inlet temperature is used to look up the table to control the opening value of the electronic thermostat, and the electronic thermostat is used to gather heat to avoid the problem of long dynamic adjustment time caused by large temperature changes in the large and small cycle water mixing stages.

[0101] S206 When the current stage is a low electric density stage, a closed loop is used to control the coolant circuit temperature;

[0102] Specifically, when it is detected that the coolant inlet temperature reaches the preset temperature, the low-electricity-density stage closed-loop control is entered; the corresponding coolant loop inlet temperature target value is obtained by looking up the table according to the real-time loading current of the fuel cell system, and the actual value of the coolant loop inlet temperature is detected in real time by the coolant inlet temperature-pressure integrated sensor, and the opening value of the electronic thermostat is controlled according to the difference between the target value and the actual value.

[0103] Before the closed-loop control of the coolant circuit temperature, the opening value of the electronic thermostat can be pre-adjusted. The opening value of the electronic thermostat can be adjusted according to the change amplitude of the load current of the fuel cell system, effectively overcoming the hysteresis of temperature change.

[0104] S207 obtains the actual value of the coolant circuit's stack temperature in real time, and obtains the corresponding coolant circuit's stack temperature target value by looking up the table according to the loading current;

[0105] Specifically, the actual value of the stack temperature of the coolant loop is detected in real time through the coolant inlet temperature and pressure integrated sensor, the loading current of the fuel cell system is obtained, and the corresponding target value of the stack temperature of the coolant loop is queried according to the loading current.

[0106] S208 calculates the difference between the target value of the coolant circuit entering the stack temperature and the actual value of the coolant circuit entering the stack temperature at the same time, and controls the opening value of the electronic thermostat according to the difference;

[0107] Specifically, the opening value of the electronic thermostat is controlled according to the deviation between the target value of the stack temperature and the actual value of the stack temperature to ensure the temperature required for the normal operation of the fuel cell. At this time, it is still in the heat storage state and the heat dissipation device is not turned on.

[0108] S209 When the current stage is the normal operating electrical tightness stage, open-loop and closed-loop combined control of the coolant circuit temperature is adopted.

[0109] Specifically, when the current stage is the normal operating electrical tightness stage, the actual value of the coolant inlet temperature is used to look up the table to control the opening value of the electronic thermostat. When the electronic thermostat is in the fully open state, the heat dissipation device is turned on, and the speed of the heat dissipation device is controlled according to the difference between the target value of the coolant circuit's inlet temperature and the actual value of the inlet temperature.

[0110] In this embodiment, the temperature changes at different stages of the coolant loop of the fuel cell system are dynamically decomposed, and stage temperature control is performed in a targeted manner. In the process of closed-loop control of the coolant loop temperature, the opening value of the electronic thermostat is controlled according to the deviation between the actual coolant inlet temperature and the target value to ensure the temperature required for normal operation of the fuel cell.

[0111] In one embodiment, referring to the accompanying drawings Figure 3 The present application provides a coolant circuit temperature control method, which is applied to a coolant circuit of a fuel cell system, wherein an electronic thermostat and a heat dissipation device are provided between the coolant circuits, including:

[0112] S201 obtains the current stage of the coolant circuit heating process;

[0113] Specifically, the coolant loop characteristics of the fuel cell system are decomposed, and the coolant loop heating process is segmented into the warm-up water mixing stage, the low-electricity density stage, and the normal operation electric density stage. When the fuel cell system starts to heat up, the coolant inlet temperature is first detected. If the temperature reaches the preset temperature, it directly enters the low-electricity density stage closed-loop control. If the temperature does not reach the preset temperature, it enters the warm-up water mixing stage open-loop control, and heat is gathered through the electronic thermostat to effectively reduce temperature fluctuations.

[0114] S202: when the current stage is the warm-up water mixing stage, the coolant circuit temperature is controlled by open loop;

[0115] Specifically, when it is detected that the coolant inlet temperature has not reached the preset temperature, open-loop control is entered in the warm-up water mixing stage; the actual value of the coolant loop's stack inlet temperature is used as the horizontal axis, and the opening value of the electronic thermostat is used as the vertical axis to obtain a set of initial values ​​in advance according to the simulation, and then artificial calibration and modification are performed based on the collected data to establish a mapping table for the two, and the actual value of the coolant stack inlet temperature is used to look up the table to control the opening value of the electronic thermostat, and the electronic thermostat is used to gather heat to avoid the problem of long dynamic adjustment time caused by large temperature changes in the large and small cycle water mixing stages.

[0116] S203 obtains the corresponding relationship between the actual value of the inlet temperature of the coolant circuit and the opening value of the electronic thermostat through simulation;

[0117] S204 establishes a mapping table according to the corresponding relationship, with the actual value of the inlet temperature of the coolant circuit as the horizontal axis and the opening value of the electronic thermostat as the vertical axis;

[0118] S205 uses a mapping table to look up the table and control the opening value of the electronic thermostat according to the actual value of the stack inlet temperature of the coolant circuit;

[0119] Specifically, the corresponding relationship between the actual value of the stack temperature and the opening value of the electronic thermostat is obtained through simulation in steps S203 and S204, and a mapping table between the two is established. When it is detected that the coolant inlet temperature does not reach the preset temperature, the warm-up water mixing stage open-loop control is entered, and the opening value of the electronic thermostat is controlled by looking up the table with the actual value of the stack temperature through step S205.

[0120] S206 When the current stage is a low electric density stage, a closed loop is used to control the coolant circuit temperature;

[0121] Specifically, when it is detected that the coolant inlet temperature reaches the preset temperature, the low-electricity-density stage closed-loop control is entered; the corresponding coolant loop inlet temperature target value is obtained by looking up the table according to the real-time loading current of the fuel cell system, and the actual value of the coolant loop inlet temperature is detected in real time by the coolant inlet temperature-pressure integrated sensor, and the opening value of the electronic thermostat is controlled according to the difference between the target value and the actual value.

[0122] S207 obtains the actual value of the coolant circuit's stack temperature in real time, and obtains the corresponding coolant circuit's stack temperature target value by looking up the table according to the loading current;

[0123] Specifically, the actual value of the stack temperature of the coolant loop is detected in real time through the coolant inlet temperature and pressure integrated sensor, the loading current of the fuel cell system is obtained, and the corresponding target value of the stack temperature of the coolant loop is queried according to the loading current.

[0124] S208 calculates the difference between the target value of the coolant circuit entering the stack temperature and the actual value of the coolant circuit entering the stack temperature at the same time, and controls the opening value of the electronic thermostat according to the difference;

[0125] Specifically, the opening value of the electronic thermostat is controlled according to the deviation between the target value of the stack temperature and the actual value of the stack temperature to ensure the temperature required for the normal operation of the fuel cell. At this time, it is still in the heat storage state and the heat dissipation device is not turned on.

[0126] S209 When the current stage is the normal operating electrical tightness stage, open-loop and closed-loop combined control of the coolant circuit temperature is adopted.

[0127] Specifically, when the current stage is the normal operating electrical tightness stage, the actual value of the coolant inlet temperature is used to look up the table to control the opening value of the electronic thermostat. When the electronic thermostat is in the fully open state, the heat dissipation device is turned on, and the speed of the heat dissipation device is controlled according to the difference between the target value of the coolant circuit's inlet temperature and the actual value of the inlet temperature.

[0128] The heat dissipation device can adopt a cooling fan. When the temperature of the battery stack is too high, the coolant is controlled to flow through the cooling fan to achieve the effect of heat dissipation. The operation mode of the cooling fan adopts a closed-loop control method, which is combined with the open-loop control of the opening value of the electronic thermostat to achieve organic decoupling of the electronic thermostat and the cooling fan control effects.

[0129] In this embodiment, the temperature changes of the coolant loop of the fuel cell system at different stages are dynamically decomposed, and stage temperature control is performed in a targeted manner. The open-loop control of the coolant loop temperature is adopted in the warm-up and water mixing stage, which can effectively reduce temperature fluctuations. The closed-loop control of the coolant loop temperature is adopted in the low-electrical density stage to ensure the temperature required for the normal operation of the fuel cell. The open-loop and closed-loop combined control of the coolant loop temperature is adopted in the normal operation stage, which can effectively decouple the control effects of the electronic thermostat and the heat dissipation device, overcome the hysteresis of temperature changes, increase the accuracy and rapidity of the coolant loop temperature control of the fuel cell system, and improve the service life of the fuel cell system.

[0130] In one embodiment, referring to the accompanying drawings Figure 4The present application provides a coolant circuit temperature control method, which is applied to a coolant circuit of a fuel cell system, wherein an electronic thermostat and a heat dissipation device are provided between the coolant circuits, including:

[0131] The coolant loop characteristics of the fuel cell system are decomposed, and the coolant loop heating process is segmented into the warm-up water mixing stage, the low electrical density stage, and the normal operation electrical density stage. When the fuel cell system starts to heat up, the coolant inlet temperature is first detected. If the temperature does not reach the preset temperature, the warm-up water mixing stage open-loop control is entered. The actual value of the coolant loop inlet temperature is used as the horizontal axis, and the opening value of the electronic thermostat is used as the vertical axis to obtain a set of initial values ​​in advance according to the simulation. Then, the mapping table of the two is established by artificial calibration and modification based on the collected data. The actual value of the coolant inlet temperature is used to look up the table to control the opening value of the electronic thermostat. The electronic thermostat gathers heat to avoid the problem of long dynamic adjustment time caused by large temperature changes in the large and small cycle water mixing stages.

[0132] When the inlet detection temperature reaches the preset temperature, it directly enters the low-electricity stage closed-loop control. The corresponding coolant loop inlet temperature target value is obtained by looking up the table according to the real-time loading current of the fuel cell system. The actual value of the coolant loop inlet temperature is detected in real time through the coolant inlet temperature and pressure integrated sensor, and the opening value of the electronic thermostat is controlled according to the difference between the target value and the actual value.

[0133] When the temperature required for normal operation of the fuel cell can be guaranteed in the low-electricity stage, the normal operation electric-density stage is entered, and the opening value of the electronic thermostat is controlled by looking up the table using the actual value of the coolant inlet temperature. When the electronic thermostat is in the fully open state, the heat dissipation device is turned on and controlled according to the difference between the coolant circuit's inlet temperature target value and the actual value of the inlet temperature.

[0134] In this embodiment, the temperature changes of the coolant loop of the fuel cell system at different stages are dynamically decomposed, and stage temperature control is performed in a targeted manner. The open-loop control of the coolant loop temperature is adopted in the warm-up and water mixing stage, which can effectively reduce temperature fluctuations. The closed-loop control of the coolant loop temperature is adopted in the low-electrical density stage to ensure the temperature required for the normal operation of the fuel cell. The open-loop and closed-loop combined control of the coolant loop temperature is adopted in the normal operation stage, which can effectively decouple the control effects of the electronic thermostat and the heat dissipation device, overcome the hysteresis of temperature changes, increase the accuracy and rapidity of the coolant loop temperature control of the fuel cell system, and improve the service life of the fuel cell system.

[0135] In one embodiment, referring to the accompanying drawings Figure 5The present application also provides a coolant circuit temperature control device, which is applied to the coolant circuit of a fuel cell system, wherein an electronic thermostat and a heat dissipation device are arranged between the coolant circuits, including an acquisition module 10, a warm-up water mixing control module 20, a low electric density control module 30, and a normal operation electric density control module 40, wherein:

[0136] An acquisition module 10 is used to acquire the current stage of the refrigerant circuit heating process;

[0137] Specifically, the coolant loop characteristics of the fuel cell system are decomposed, and the coolant loop heating process is segmented into a warm-up water mixing stage, a low electric density stage, and a normal operation electric density stage. The current stage of the coolant loop heating process is obtained by acquiring module 10. When the fuel cell system starts to heat up, the coolant inlet temperature is first detected. If the temperature reaches the preset temperature, it directly enters the low electric density stage closed-loop control. If the temperature does not reach the preset temperature, it enters the warm-up water mixing stage open-loop control. The electronic thermostat gathers heat to effectively reduce temperature fluctuations.

[0138] The warm-up water mixing control module 20 is used to control the coolant circuit temperature in an open loop when the current stage is the warm-up water mixing stage. Under the open loop control, the opening value of the electronic thermostat is open loop controlled according to the actual value of the inlet temperature of the coolant circuit;

[0139] Specifically, when it is detected that the coolant inlet temperature has not reached the preset temperature, open-loop control is entered in the warm-up water mixing stage; the actual value of the coolant loop's stack inlet temperature is used as the horizontal axis, and the opening value of the electronic thermostat is used as the vertical axis to obtain a set of initial values ​​in advance according to the simulation, and then artificial calibration and modification are performed based on the collected data to establish a mapping table for the two, and the actual value of the coolant stack inlet temperature is used to look up the table to control the opening value of the electronic thermostat, and the electronic thermostat is used to gather heat to avoid the problem of long dynamic adjustment time caused by large temperature changes in the large and small cycle water mixing stages.

[0140] The low electric density control module 30 is used to control the coolant circuit temperature in a closed loop when the current stage is the low electric density stage. Under the closed loop control, the opening value of the electronic thermostat is controlled in a closed loop according to the difference between the target value of the coolant circuit entering the stack temperature and the actual value of the coolant circuit entering the stack temperature;

[0141] Specifically, when it is detected that the coolant inlet temperature reaches the preset temperature, the low-electricity-density stage closed-loop control is entered; the corresponding coolant loop inlet temperature target value is obtained by looking up the table according to the real-time loading current of the fuel cell system, and the actual value of the coolant loop inlet temperature is detected in real time by the coolant inlet temperature-pressure integrated sensor, and the opening value of the electronic thermostat is controlled according to the difference between the target value and the actual value.

[0142] The normal operation electrical control module 40 is used to control the coolant circuit temperature by open-loop and closed-loop combined control when the current stage is the normal operation electrical control stage. Under the open-loop and closed-loop combined control, the opening value of the electronic thermostat is open-loop controlled according to the actual value of the coolant circuit's stack entry temperature, and the heat dissipation device is closed-loop controlled according to the difference between the coolant circuit's stack entry temperature target value and the coolant circuit's stack entry temperature actual value.

[0143] Specifically, when the current stage is the normal operating electrical tightness stage, the actual value of the coolant inlet temperature is used to look up the table to control the opening value of the electronic thermostat. When the electronic thermostat is in the fully open state, the heat dissipation device is turned on, and the heat dissipation device is controlled according to the difference between the coolant circuit's inlet temperature target value and the actual value of the inlet temperature.

[0144] In this embodiment, the coolant loop heating process is divided into a warm-up water mixing stage, a low-electricity density stage, and a normal operating electric density stage. The current stage of the coolant loop heating process is acquired through the acquisition module 10; when the current stage is the warm-up water mixing stage, the coolant loop temperature is controlled in an open loop through the warm-up water mixing control module 20; when the current stage is the low-electricity density stage, the coolant loop temperature is controlled in a closed loop through the low-electricity density control module 30; when the current stage is the normal operating electric density stage, the coolant loop temperature is controlled in an open loop and a closed loop through the normal operating electric density control module 40. The temperature changes of the coolant loop of the fuel cell system at different stages are dynamically decomposed, and stage temperature control is performed in a targeted manner. This can effectively overcome the hysteresis of temperature changes, increase the accuracy and rapidity of the temperature control of the coolant loop of the fuel cell system, and improve the service life of the fuel cell system.

[0145] In one embodiment, referring to the accompanying drawings Figure 5 Based on the above-mentioned embodiment, the warm-up water mixing control module 20 includes:

[0146] A simulation acquisition unit 21, used for acquiring the corresponding relationship between the actual value of the stack inlet temperature of the coolant circuit and the opening value of the electronic thermostat through simulation;

[0147] A mapping table establishment unit 22 is used to establish a mapping table according to the corresponding relationship by taking the actual value of the inlet temperature of the coolant circuit as the horizontal axis and the opening value of the electronic thermostat as the vertical axis;

[0148] The table lookup control unit 23 is used to control the opening value of the electronic thermostat by looking up the table according to the actual value of the stack inlet temperature of the coolant circuit through a mapping table.

[0149] In this embodiment, when it is detected that the coolant inlet temperature has not reached the preset temperature, the warm-up water mixing stage is entered into open-loop control; the actual value of the inlet temperature of the coolant loop is used as the horizontal axis through the simulation acquisition unit 21, and the opening value of the electronic thermostat is used as the vertical axis to obtain a set of initial values ​​in advance according to the simulation, and then the mapping table establishment unit 22 is used to perform artificial calibration and modification based on the collected data to establish a mapping table for the two, and then the actual value of the coolant inlet temperature is used to look up the table through the table lookup control unit 23 to control the opening value of the electronic thermostat, and the electronic thermostat is used to gather heat through the electronic thermostat to avoid the problem of long dynamic adjustment time caused by large temperature changes in the large and small circulation water mixing stages.

[0150] In one embodiment, referring to the accompanying drawings Figure 5 Based on the above-mentioned embodiment, the low electric density control module 30 includes:

[0151] A real-time acquisition unit 31 is used to acquire the actual value of the inlet temperature of the coolant circuit in real time;

[0152] A table lookup acquisition unit 32 is used to obtain a corresponding target value of the stack temperature of the coolant circuit according to the loading current;

[0153] The difference calculation unit 33 is used to calculate the difference between the target value of the coolant circuit entering the stack temperature and the actual value of the coolant circuit entering the stack temperature at the same time;

[0154] The control unit 34 is used to control the opening value of the electronic thermostat according to the difference.

[0155] In this embodiment, when it is detected that the coolant inlet temperature reaches the preset temperature, the closed-loop control enters the low-electrical density stage; the actual value of the coolant loop inlet temperature is obtained by the real-time acquisition unit 31, and the corresponding coolant loop inlet temperature target value is obtained by the table lookup acquisition unit 32 according to the loading current, and then the difference calculation unit 33 is used to calculate the deviation between the actual value and the target value of the coolant loop inlet temperature at the same time, and finally the control unit 34 is used to control the opening value of the electronic thermostat according to the difference, so as to ensure the temperature required for the normal operation of the fuel cell in the low-electrical density stage and increase the accuracy of the coolant loop temperature control of the fuel cell system.

[0156] It should be noted that the coolant circuit temperature control device embodiment provided in this application and the coolant circuit temperature control method embodiment provided above are based on the same inventive concept and can achieve the same technical effect. Therefore, other specific contents of the coolant circuit temperature control device embodiment can refer to the contents of the coolant circuit temperature control method embodiment above.

[0157] In one embodiment, the present application further provides a terminal device for controlling the temperature of a coolant circuit, comprising a processor and a memory, wherein the memory is used to store a computer program; and the processor is used to execute the computer program stored in the memory to implement the coolant circuit temperature control method in the above method embodiment.

[0158] The terminal device may include, but is not limited to, a processor and a memory. Those skilled in the art will appreciate that the above are merely examples of terminal devices and do not constitute a limitation on the terminal device. The terminal device may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the terminal device may also include an input / output interface, a display device, a network access device, a communication bus, a communication interface, and the like. The communication interface and the communication bus may also include an input / output interface, wherein the processor, the memory, the input / output interface, and the communication interface communicate with each other via the communication bus. The memory stores a computer program, and the processor is used to execute the computer program stored in the memory to implement the coolant circuit temperature control method in the above method embodiment.

[0159] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0160] The memory may be an internal storage unit of the terminal device, such as a hard disk or memory of the terminal device. The memory may also be an external storage device of the terminal device, such as a plug-in hard disk, a smart memory card (SmartMediaCard, SMC), a secure digital (SecureDigital, SD) card, a flash card (FlashCard), etc. equipped on the terminal device. Furthermore, the memory may include both an internal storage unit of the terminal device and an external storage device. The memory is used to store the computer program and other programs and data required by the terminal device. The memory may also be used to temporarily store data that has been output or is to be output.

[0161] The communication bus is a circuit that connects the elements described and implements transmission between these elements. For example, the processor receives commands from other elements through the communication bus, decrypts the received commands, and performs calculations or data processing according to the decrypted commands. The memory may include program modules, such as a kernel, middleware, an application programming interface (API), and an application. The program module may be composed of software, firmware, or hardware, or at least two of them. The input / output interface forwards commands or data entered by the user through the input / output interface (such as a sensor, keyboard, or touch screen). The communication interface connects the terminal device to other network devices, user devices, and networks. For example, the communication interface may be connected to the network via wired or wireless connection to connect to other external network devices or user devices. Wireless communication may include at least one of the following: wireless fidelity (WiFi), Bluetooth (BT), near field communication technology (NFC), global satellite positioning system (GPS), and cellular communication, etc. Wired communication may include at least one of the following: universal serial bus (USB), high-definition multimedia interface (HDMI), asynchronous transmission standard interface (RS-232), etc. The network may be a telecommunication network and a communication network. The communication network may be a computer network, the Internet, the Internet of Things, or a telephone network. The terminal device may be connected to the network via a communication interface, and the protocol used by the terminal device and other network devices to communicate may be supported by at least one of an application, an application programming interface (API), a middleware, a kernel, and a communication interface.

[0162] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0163] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed with hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0164] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0165] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0166] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A coolant circuit temperature control method, applied to a coolant circuit of a fuel cell system, wherein an electronic thermostat and a heat sink are provided between the coolant circuits, characterized in that: Includes steps: Obtaining a current stage of the coolant circuit heating process; When the current stage is the warm-up water mixing stage, the coolant circuit temperature is controlled in an open loop, and under the open loop control, the opening value of the electronic thermostat is open-loop controlled according to the actual value of the stack inlet temperature of the coolant circuit; When the current stage is a low-electricity stage, the coolant circuit temperature is controlled in a closed loop. Under the closed loop control, the opening value of the electronic thermostat is controlled in a closed loop according to the difference between the target value of the coolant circuit entering the stack temperature and the actual value of the coolant circuit entering the stack temperature; When the current stage is the normal operating electrical tightness stage, the coolant circuit temperature is controlled jointly by open-loop and closed-loop. Under the open-loop and closed-loop joint control, the opening value of the electronic thermostat is firstly open-loop controlled according to the actual value of the stack entering temperature of the coolant circuit. When the electronic thermostat is in the fully open state, the heat dissipation device is turned on, and the heat dissipation device is closed-loop controlled according to the difference between the target value of the stack entering temperature of the coolant circuit and the actual value of the stack entering temperature of the coolant circuit.

2. The coolant circuit temperature control method according to claim 1, characterized in that: The obtaining of the current stage of the coolant circuit heating process comprises the steps of: When it is detected that the coolant inlet temperature does not reach the first preset temperature, the warm-up water mixing stage is entered; When it is detected that the coolant inlet temperature reaches the first preset temperature and does not reach the second preset temperature, the low electric density stage is entered, and the first preset temperature is lower than the second preset temperature; When it is detected that the coolant inlet temperature reaches the second preset temperature, the normal operation electrical tightness stage is entered.

3. The coolant circuit temperature control method according to claim 1, characterized in that: The open-loop control of the opening value of the electronic thermostat according to the actual value of the stack inlet temperature of the coolant circuit comprises the following steps: Acquire the corresponding relationship between the actual value of the stack inlet temperature of the coolant circuit and the opening value of the electronic thermostat through simulation; According to the corresponding relationship, a mapping table is established with the actual value of the stack inlet temperature of the coolant circuit as the horizontal axis and the opening value of the electronic thermostat as the vertical axis; The mapping table is used to control the opening value of the electronic thermostat according to the actual value of the stack inlet temperature of the coolant circuit.

4. The coolant circuit temperature control method according to claim 1, characterized in that: Before the closed-loop control of the opening value of the electronic thermostat according to the difference between the target value of the coolant circuit entering the stack temperature and the actual value of the coolant circuit entering the stack temperature, a feedforward control step is also included: Acquiring the loading current of the fuel cell system in real time; The opening value of the electronic thermostat is pre-adjusted according to the change amplitude of the loading current.

5. The coolant circuit temperature control method according to claim 1, characterized in that: The closed-loop control of the opening value of the electronic thermostat according to the difference between the target value of the coolant circuit entering the stack temperature and the actual value of the coolant circuit entering the stack temperature comprises the steps of: Acquiring the actual value of the inlet temperature of the coolant loop in real time; Obtaining a corresponding target value of the stack temperature of the coolant circuit by looking up the table according to the loading current; Calculating the difference between the target value of the coolant circuit entering the stack and the actual value of the coolant circuit entering the stack at the same time; The opening value of the electronic thermostat is controlled according to the difference.

6. The coolant circuit temperature control method according to claim 1, wherein the closed-loop control of the heat dissipation device is performed according to the difference between the target value of the coolant circuit entering the stack temperature and the actual value of the coolant circuit entering the stack temperature, comprising: The rotation speed of the heat sink is controlled by a closed loop.

7. A coolant circuit temperature control device, applied to a coolant circuit of a fuel cell system, wherein an electronic thermostat and a heat dissipation device are arranged between the coolant circuits, characterized in that: include: An acquisition module, used for acquiring the current stage of the refrigerant circuit heating process; A warm-up water mixing control module, used to control the coolant circuit temperature in an open loop when the current stage is the warm-up water mixing stage, and to control the opening value of the electronic thermostat in an open loop according to the actual value of the stack inlet temperature of the coolant circuit under the open loop control; A low-electricity density control module, used for, when the current stage is the low-electricity density stage, adopting a closed-loop control on the temperature of the coolant circuit, and under the closed-loop control, controlling the opening value of the electronic thermostat in a closed-loop manner according to the difference between the target value of the coolant circuit entering the stack temperature and the actual value of the coolant circuit entering the stack temperature; The normal operation electrical density control module is used to control the coolant circuit temperature by open-loop and closed-loop combined control when the current stage is the normal operation electrical density stage. Under the open-loop and closed-loop combined control, the opening value of the electronic thermostat is firstly open-loop controlled according to the actual value of the stack entering temperature of the coolant circuit. When the electronic thermostat is in the fully open state, the heat dissipation device is turned on, and the heat dissipation device is closed-loop controlled according to the difference between the target value of the stack entering temperature of the coolant circuit and the actual value of the stack entering temperature of the coolant circuit.

8. The coolant circuit temperature control device according to claim 7, characterized in that: The warm-up water mixing control module further includes: A simulation acquisition unit, used for acquiring the corresponding relationship between the actual value of the stack inlet temperature of the coolant circuit and the opening value of the electronic thermostat through simulation; A mapping table establishment unit is used to establish a mapping table according to the corresponding relationship by taking the actual value of the stack inlet temperature of the coolant circuit as the horizontal axis and the opening value of the electronic thermostat as the vertical axis; A table lookup control unit is used to control the opening value of the electronic thermostat by looking up the table according to the mapping table using the actual value of the stack inlet temperature of the coolant circuit.

9. The coolant circuit temperature control device according to claim 7, characterized in that: The low electric density control module further includes: A real-time acquisition unit, used for acquiring the actual value of the stack inlet temperature of the coolant loop in real time; A table lookup acquisition unit, configured to obtain a corresponding target value of the stack temperature of the coolant circuit according to the loading current; A difference calculation unit, used for calculating the difference between the target value of the coolant circuit entering the stack and the actual value of the coolant circuit entering the stack at the same time; A control unit is used to control the opening value of the electronic thermostat according to the difference.

10. A terminal device, characterized in that: The terminal includes a processor, a memory connected to the processor, and program instructions stored in the memory, and the processor implements the coolant circuit temperature control method according to any one of claims 1 to 6 when executing the program instructions.

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