Control method and device of fuel cell engine, vehicle and storage medium

Abstract

The invention relates to a control method and device of a fuel cell engine, a vehicle and a storage medium, and the method comprises the following steps: when the initial outlet water temperature of a current electric pile is smaller than the lower limit value of a preset water temperature interval, calculating first heat required for increasing the initial outlet water temperature to a target temperature, and calculating second heat required for increasing the initial outlet water temperature to the target temperature under the current power of the current engine; a second heat generated by the current stack; if the second heat is larger than the first heat, the current water pump rotating speed of the engine is adjusted according to the first target cooling liquid flow, otherwise, the heat dissipating capacity of engine heat dissipating equipment, third heat needed for increasing the initial outlet water temperature to the target temperature and the first duration are calculated, and the current water pump is controlled to operate based on the first preset rotating speed and the first duration; the initial outlet water temperature of the current electric pile is in the preset water temperature interval. Therefore, by monitoring the water temperature at the outlet of the galvanic pile, the control strategy is adaptively adjusted, excessive heat dissipation of the galvanic pile under a low-temperature condition is prevented, and the galvanic pile works in a proper temperature range.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a control method, device, vehicle and storage medium for a fuel cell engine. Background Art

[0002] With the deterioration of the global environment and the intensification of climate change, countries have gradually announced the time to ban the sale of fuel vehicles, and new energy vehicles are gradually becoming historical. Hydrogen fuel cell vehicles have gradually gained attention from various countries due to their advantages such as zero emissions, fast hydrogen refueling and long driving range, and have become one of the important development directions in the field of new energy vehicles in the future.

[0003] Proton Exchange Membrane Fuel Cell (PEMFC) is a widely used automotive fuel cell technology. The air at the anode and the hydrogen at the cathode react chemically in the membrane electrode under the action of the catalyst to generate electricity. However, a large amount of heat is generated during the reaction, so a specific radiator is required to accurately dissipate the heat generated by the stack.

[0004] Due to the changing operating conditions and complex roads during driving, it is inevitable to encounter extremely cold environments. Under low temperature conditions, the radiator will dissipate more heat than under normal conditions, which will cause excessive heat dissipation of the fuel cell stack and cause the internal temperature of the stack to be too low. This will not only affect the efficiency of the reaction, but also shorten the service life of the stack, which urgently needs to be solved. Summary of the invention

[0005] The present application provides a control method, device, vehicle and storage medium for a fuel cell engine. By monitoring the water temperature at the outlet of the fuel cell stack and comparing the water temperature at the outlet of the fuel cell stack with a preset water temperature range, the control strategy is adaptively adjusted to prevent the fuel cell stack from excessively dissipating heat under low temperature conditions, thereby preventing the internal operating temperature of the fuel cell stack from being too low, allowing the fuel cell stack to operate within an appropriate temperature range, thereby improving the efficiency of the reaction.

[0006] The first aspect of the present application provides a control method for a fuel cell engine, comprising the following steps:

[0007] Get the current power of the current engine and the initial outlet water temperature of the current fuel cell stack;

[0008] If the initial outlet water temperature of the current fuel cell stack is less than the lower limit of the preset water temperature range, the first heat required to increase the initial outlet water temperature to the target temperature is calculated, and the second heat generated by the current fuel cell stack at the current power is calculated;

[0009] If the second heat is greater than the first heat, the first target coolant flow rate is calculated, and the current water pump speed of the engine is adjusted according to the first target coolant flow rate; otherwise, the heat dissipation of the engine cooling device at the first preset speed of the current water pump, the third heat and the first duration required to increase the initial outlet water temperature to the target temperature are calculated, and the current water pump is controlled to operate based on the first preset speed and the first duration until the initial outlet water temperature of the current fuel cell stack is in the preset water temperature range.

[0010] According to one embodiment of the present application, after obtaining the current power of the current engine and the initial outlet water temperature of the current fuel cell stack, the method further includes:

[0011] If the initial outlet water temperature of the current fuel cell stack is within the preset water temperature range, the inlet water temperature and the outlet water temperature of the engine cooling device are obtained, and the inlet and outlet temperature difference of the engine cooling device is calculated according to the inlet water temperature and the outlet water temperature of the engine cooling device;

[0012] A second target coolant flow rate is calculated according to the inlet and outlet temperature difference, and a current water pump speed of the engine is adjusted according to the second target coolant flow rate.

[0013] According to one embodiment of the present application, after obtaining the current power of the current engine and the initial outlet water temperature of the current fuel cell stack, the method further includes:

[0014] If the initial outlet water temperature of the current fuel cell stack is greater than the upper limit of the preset water temperature range, the current water pump is controlled to operate based on a second preset speed and a second duration, and a new initial outlet water temperature of the current fuel cell stack is re-acquired, wherein the second preset speed is greater than the first preset speed;

[0015] If the initial outlet water temperature of the new current fuel cell stack is greater than the upper limit of the preset water temperature range, the engine is controlled to shut down and an over-temperature fault reminder is issued.

[0016] According to one embodiment of the present application, after re-obtaining the new initial outlet water temperature of the current fuel cell stack, the method further includes:

[0017] If the initial outlet water temperature of the new current fuel cell stack is less than or equal to the upper limit of the preset water temperature range, the step of obtaining the inlet water temperature of the engine cooling device and the outlet water temperature of the engine cooling device is performed.

[0018] According to one embodiment of the present application, before obtaining the current power of the current engine and the initial outlet water temperature of the current fuel cell stack, the method further includes:

[0019] Get the current ambient temperature;

[0020] Determine whether the current ambient temperature is less than a preset temperature;

[0021] If the current ambient temperature is lower than the preset temperature, the current engine is controlled to enter a preset low-temperature operating mode, so as to obtain the current power of the current engine and the initial outlet water temperature of the current fuel cell stack after the current engine enters the preset low-temperature operating mode.

[0022] According to an embodiment of the present application, the determining whether the current ambient temperature is less than a preset temperature further includes:

[0023] If the current ambient temperature is greater than or equal to the preset temperature, the current engine is controlled to enter a normal operating mode.

[0024] According to the control method of the fuel cell engine provided by the embodiment of the present application, when the initial outlet water temperature of the current stack is less than the lower limit of the preset water temperature range, the first heat required to increase the initial outlet water temperature to the target temperature is calculated, and the second heat generated by the current stack under the current power of the current engine is calculated; if the second heat is greater than the first heat, the current water pump speed of the engine is adjusted according to the first target coolant flow rate, otherwise, the heat dissipation of the engine cooling device, the third heat required to increase the initial outlet water temperature to the target temperature and the first duration are calculated, and the current water pump is controlled to operate based on the first preset speed and the first duration until the initial outlet water temperature of the current stack is in the preset water temperature range. Thus, by monitoring the water temperature at the outlet of the stack and comparing the outlet water temperature of the stack with the preset water temperature range, the control strategy is adaptively adjusted to prevent the stack from excessive heat dissipation under low temperature conditions, thereby preventing the internal operating temperature of the stack from being too low, so that the stack works within a suitable temperature range, thereby improving the efficiency of the reaction.

[0025] A second aspect of the present application provides a control device for a fuel cell engine, comprising:

[0026] An acquisition module is used to obtain the current power of the current engine and the initial outlet water temperature of the current fuel cell stack;

[0027] a calculation module, configured to calculate a first amount of heat required to increase the initial outlet water temperature to a target temperature if the initial outlet water temperature of the current stack is less than a lower limit of a preset water temperature range, and calculate a second amount of heat generated by the current stack at the current power;

[0028] A control module is used to calculate a first target coolant flow rate if the second heat amount is greater than the first heat amount, and adjust the current water pump speed of the engine according to the first target coolant flow rate; otherwise, calculate the heat dissipation of the engine cooling device at a first preset speed of the current water pump, a third amount of heat and a first duration required to increase the initial outlet water temperature to the target temperature, and control the current water pump to operate based on the first preset speed and the first duration until the initial outlet water temperature of the current fuel cell stack is in the preset water temperature range.

[0029] According to one embodiment of the present application, after obtaining the current power of the current engine and the initial outlet water temperature of the current fuel cell stack, the obtaining module is further used to:

[0030] If the initial outlet water temperature of the current fuel cell stack is within the preset water temperature range, the inlet water temperature and the outlet water temperature of the engine cooling device are obtained, and the inlet and outlet temperature difference of the engine cooling device is calculated according to the inlet water temperature and the outlet water temperature of the engine cooling device;

[0031] A second target coolant flow rate is calculated according to the inlet and outlet temperature difference, and a current water pump speed of the engine is adjusted according to the second target coolant flow rate.

[0032] According to one embodiment of the present application, after obtaining the current power of the current engine and the initial outlet water temperature of the current fuel cell stack, the obtaining module is further used to:

[0033] If the initial outlet water temperature of the current fuel cell stack is greater than the upper limit of the preset water temperature range, the current water pump is controlled to operate based on a second preset speed and a second duration, and a new initial outlet water temperature of the current fuel cell stack is re-acquired, wherein the second preset speed is greater than the first preset speed;

[0034] If the initial outlet water temperature of the new current fuel cell stack is greater than the upper limit of the preset water temperature range, the engine is controlled to shut down and an over-temperature fault reminder is issued.

[0035] According to one embodiment of the present application, after re-obtaining the new initial outlet water temperature of the current fuel cell stack, the acquisition module is further used to:

[0036] If the initial outlet water temperature of the new current fuel cell stack is less than or equal to the upper limit of the preset water temperature range, the step of obtaining the inlet water temperature of the engine cooling device and the outlet water temperature of the engine cooling device is performed.

[0037] According to one embodiment of the present application, before obtaining the current power of the current engine and the initial outlet water temperature of the current fuel cell stack, the obtaining module is further used to:

[0038] Get the current ambient temperature;

[0039] Determine whether the current ambient temperature is less than a preset temperature;

[0040] If the current ambient temperature is lower than the preset temperature, the current engine is controlled to enter a preset low-temperature operating mode, so as to obtain the current power of the current engine and the initial outlet water temperature of the current fuel cell stack after the current engine enters the preset low-temperature operating mode.

[0041] According to one embodiment of the present application, the acquisition module is further used to:

[0042] If the current ambient temperature is greater than or equal to the preset temperature, the current engine is controlled to enter a normal operating mode.

[0043] According to the control device of the fuel cell engine provided by the embodiment of the present application, when the initial outlet water temperature of the current stack is less than the lower limit of the preset water temperature range, the first heat required to increase the initial outlet water temperature to the target temperature is calculated, and the second heat generated by the current stack under the current power of the current engine is calculated; if the second heat is greater than the first heat, the current water pump speed of the engine is adjusted according to the first target coolant flow rate, otherwise, the heat dissipation of the engine cooling device, the third heat required to increase the initial outlet water temperature to the target temperature and the first duration are calculated, and the current water pump is controlled to operate based on the first preset speed and the first duration until the initial outlet water temperature of the current stack is in the preset water temperature range. Thus, by monitoring the water temperature at the outlet of the stack and comparing the outlet water temperature of the stack with the preset water temperature range, the control strategy is adaptively adjusted to prevent the stack from excessive heat dissipation under low temperature conditions, thereby preventing the internal operating temperature of the stack from being too low, so that the stack works within a suitable temperature range, thereby improving the efficiency of the reaction.

[0044] A third aspect of the present application provides a vehicle, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the control method of the fuel cell engine as described in the above embodiment.

[0045] A fourth aspect of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the control method of the fuel cell engine as described in the above embodiment.

[0046] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0048] Figure 1 is a schematic structural diagram of a fuel cell engine according to an embodiment of the present application;

[0049] Figure 2 A flowchart of a fuel cell engine control method provided according to an embodiment of the present application;

[0050] Figure 3 is a flow chart of a method for controlling a fuel cell engine according to an embodiment of the present application;

[0051] Figure 4 is a block diagram of a control device for a fuel cell engine according to an embodiment of the present application;

[0052] Figure 5 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application.

[0053] Figure numerals: 110 - thermal management subsystem, 120 - air supply subsystem, 111 - first temperature sensor, 112 - second temperature sensor, 113 - third temperature sensor, 114 - fourth temperature sensor, 115 - PTC (Positive Temperature Coefficient, heater), 116 - thermostat, 117 - radiator, 118 - water pump, 121 - air filter, 122 - flow meter, 123 - air compressor, 124 - intercooler, 125 - sixth temperature sensor, 126 - electronic throttle, 127 - hydrogen dilution device; 10 - control device of fuel cell engine, 100 - acquisition module, 200 - calculation module, 300 - control module; 501 - memory, 502 - processor, 503 - communication interface. DETAILED DESCRIPTION

[0054] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0055] The following describes a control method, device, vehicle, and storage medium for a fuel cell engine according to an embodiment of the present application with reference to the accompanying drawings.

[0056] Before introducing the control method of the fuel cell engine of the embodiment of the present application, the fuel cell engine involved in the control method of the fuel cell engine of the present application is briefly introduced.

[0057] Specifically, if Figure 1 As shown, the fuel cell engine according to the embodiment of the present application includes a thermal management subsystem 110 and an air supply subsystem 120 .

[0058] The thermal management subsystem 110 includes a first temperature sensor 111, a second temperature sensor 112, a third temperature sensor 113, a fourth temperature sensor 114, a PTC 115, a thermostat 116, a radiator 117 and a water pump 118. The water pump 118 provides power for the rotation of the pipeline coolant, the thermostat 116 controls the flow of the coolant flowing through the PTC 115 and the radiator 117, the PTC 115 is used to heat the coolant during cold start, the first temperature sensor 111 measures the inlet water temperature T1 of the coolant stack, the second temperature sensor 112 measures the outlet water temperature T2 of the coolant stack, the third temperature sensor 113 measures the outlet water temperature T3 of the coolant radiator 117, and the fourth temperature sensor 114 measures the inlet water temperature T4 of the coolant radiator 117, wherein the inlet water temperature T4 of the radiator 117 and the outlet water temperature T3 of the radiator 117 are greatly affected by the ambient temperature and need to be monitored in real time to ensure the accuracy of flow regulation under extremely cold temperatures.

[0059] Furthermore, the air supply subsystem 120 includes an air filter 121, a flow meter 122, an air compressor 123, an intercooler 124, a sixth temperature sensor 125, an electronic throttle 126 and a hydrogen dilution device 127. The air filter 121 is used to filter physical and chemical impurities in the air, the air compressor 123 is used to pressurize the air, the intercooler 124 is used to cool the air compressor 123, the battery stack and the intercooler 124 are connected in parallel, and the heat generated needs to be taken away by the radiator 117, and the electronic throttle 126 is used to jointly adjust the air pipeline pressure with the air compressor 123. The sixth temperature sensor 125 is used to measure the temperature T6 of the air entering the battery stack. The battery stack has an ideal air inlet temperature requirement according to different powers, and the heat dissipation of the intercooler 124 needs to make the temperature T6 of the air entering the battery stack meet the requirement of the ideal air inlet temperature.

[0060] A control method of a fuel cell engine based on the above-mentioned fuel cell engine is introduced below.

[0061] Specifically, Figure 2 A schematic flow chart of a control method for a fuel cell engine provided in an embodiment of the present application.

[0062] like Figure 2 As shown, the control method of the fuel cell engine includes the following steps:

[0063] In step S201, the current power of the current engine and the initial outlet water temperature of the current fuel cell stack are obtained.

[0064] Optionally, the embodiment of the present application may use a power sensor to obtain the current power of the current engine, or may use Figure 1 The second temperature sensor 112 in obtains the initial outlet water temperature of the current fuel cell stack.

[0065] It should be noted that the above-mentioned method of obtaining the current power of the current engine and the initial outlet water temperature of the current fuel cell stack is only exemplary and is not intended to limit the present application. Technical personnel in this field may adopt other methods in the prior art to obtain the current power of the current engine and the initial outlet water temperature of the current fuel cell stack according to actual conditions, and no specific limitation is made here.

[0066] Furthermore, in some embodiments, before obtaining the current power of the current engine and the initial outlet water temperature of the current fuel cell stack, it also includes: obtaining the current ambient temperature; determining whether the current ambient temperature is lower than a preset temperature; if the current ambient temperature is lower than the preset temperature, controlling the current engine to enter a preset low-temperature operating mode, so as to obtain the current power of the current engine and the initial outlet water temperature of the current fuel cell stack after the current engine enters the preset low-temperature operating mode.

[0067] Furthermore, in some embodiments, determining whether the current ambient temperature is less than a preset temperature further includes: if the current ambient temperature is greater than or equal to the preset temperature, controlling the current engine to enter a normal working mode.

[0068] Optionally, the embodiment of the present application may use a temperature sensor to obtain the current ambient temperature, and the preset temperature may be a temperature pre-set by a person skilled in the art, such as -10°C, which is not specifically limited here.

[0069] Specifically, after obtaining the current ambient temperature, the current ambient temperature is compared with the preset temperature. If the current ambient temperature is lower than the preset temperature, it means that the current ambient temperature is too low. Under low temperature conditions, the radiator will dissipate more heat than under normal conditions, thereby causing excessive heat dissipation of the fuel cell stack. Therefore, in order to prevent the stack from excessively dissipating heat under low temperature conditions, the current engine is controlled to enter a preset low-temperature operating mode, and after the current engine enters the preset low-temperature operating mode, the current power of the current engine and the initial outlet water temperature of the current stack are obtained.

[0070] It is understandable that if the current ambient temperature is greater than or equal to the preset temperature, it means that the current ambient temperature is within an appropriate range and there is no need to enter the preset low-temperature working mode. Therefore, the engine is controlled to enter the normal working mode.

[0071] In step S202, if the initial outlet water temperature of the current fuel cell stack is less than the lower limit of the preset water temperature range, the first heat required to increase the initial outlet water temperature to the target temperature is calculated, and the second heat generated by the current fuel cell stack at the current power is calculated.

[0072] Among them, the preset water temperature range can be a water temperature range pre-set by technical personnel in this field, can be a water temperature range obtained through a limited number of experiments, or can be a water temperature range obtained through computer simulation, and is not specifically limited here.

[0073] Specifically, if the current initial outlet water temperature of the fuel cell stack is lower than the lower limit of the preset water temperature range, it is necessary to reduce the engine water pump speed and the coolant flow through the radiator, and use the heat generated by the fuel cell stack to continuously heat up the fuel cell stack. First, calculate the first heat required to increase the initial outlet water temperature to the target temperature (i.e., the heat for heating the fuel cell stack), and the first heat is calculated based on the current flow rate being unchanged.

[0074] Furthermore, the second heat generated by the stack at the current power (i.e., the heat generated by the stack) is calculated according to the number of stack cells, the middle value of the high and low calorific values ​​of the stack, the stack cell voltage, and the stack current. The second heat can be expressed as:

[0075] Q2=N×(mV cell )×I st (1)

[0076] Among them, Q2 is the heat generated by the stack, N is the number of cells in the stack, m is the middle value of the high and low calorific values ​​of the stack, V cell is the cell voltage of the battery stack, I st is the stack current.

[0077] In step S203, if the second heat is greater than the first heat, the first target coolant flow rate is calculated, and the current water pump speed of the engine is adjusted according to the first target coolant flow rate; otherwise, the heat dissipation of the engine cooling device, the third heat required to increase the initial outlet water temperature to the target temperature (i.e., the heat dissipation of the radiator) and the first duration are calculated at the first preset speed of the current water pump, and the current water pump is controlled to operate based on the first preset speed and the first duration until the initial outlet water temperature of the current fuel cell stack is in the preset water temperature range.

[0078] The first preset rotation speed may be a relatively low rotation speed pre-set by a person skilled in the art, and is not specifically limited here. The heat dissipation device may be a radiator.

[0079] It should be noted that the sum of the heat generated by the stack and the heat dissipation of the radiator in the embodiment of the present application is equal to the sum of the heat generated by the stack and the heat generated by the intercooler, that is:

[0080] Q1+Q4=Q2+Q3(2)

[0081] Among them, Q1 is the heat generated by the battery stack, Q4 is the heat dissipated by the radiator, Q2 is the heat generated by the battery stack, and Q3 is the heat generated by the intercooler.

[0082] Furthermore, the heat generated by the battery stack and the heat generated by the heating of the battery stack are compared. If the heat generated by the battery stack is greater than the heat generated by the heating of the battery stack, the heat generated by the battery stack can enable the battery stack to reach the target operating temperature.

[0083] At this time, the heat Q3 generated by the intercooler in formula (3) can be expressed as:

[0084]

[0085] Among them, Q3 is the heat generated by the intercooler, M air is the air mass flow rate, C air is the specific heat capacity of air, T1 is the water temperature at the inlet of the coolant stack, ηC is the efficiency of the air compressor, π is the pressure ratio, r is the air insulation coefficient, T6 is the temperature of the air entering the stack, and T7 is the inlet temperature of the air compressor.

[0086] Furthermore, the heat Q1 of the battery stack at this time is:

[0087] Q1=c×M1×(T0-T2)(4)

[0088] Among them, Q1 is the heat of heating of the fuel cell stack, C is the specific heat capacity of the coolant, M1 is the first target coolant flow rate, T0 is the lower limit of the preset water temperature range, and T2 is the initial outlet water temperature of the current fuel cell stack.

[0089] Furthermore, the heat dissipation Q4 of the radiator can be expressed as:

[0090] Q4=C×M1×(T4-T3)(5)

[0091] Among them, Q4 is the heat dissipation of the radiator, C is the specific heat capacity of the coolant, M1 is the first target coolant flow rate, T4 is the coolant radiator inlet water temperature, and T3 is the coolant radiator outlet water temperature.

[0092] Thus, the right side of equation (3) can be calculated, and then the first target coolant flow rate can be calculated. The first target coolant flow rate can be expressed as:

[0093] M1=(Q2+Q3) / C×(T0-T2+T4-T3)(6)

[0094] Among them, M1 is the first target coolant flow rate, Q2 is the heat generated by the fuel cell stack, Q3 is the heat generated by the intercooler, C is the specific heat capacity of the coolant, T0 is the lower limit of the preset water temperature range, T2 is the initial outlet water temperature of the current fuel cell stack, T4 is the inlet water temperature of the coolant radiator, and T3 is the outlet water temperature of the coolant radiator.

[0095] Thus, the current water pump speed is calculated according to the first target coolant flow rate, and the water pump speed of the engine is adjusted based on the calculated water pump speed.

[0096] Furthermore, if after comparing the first heat (heat generated by the battery stack) and the second heat (heat generated by the battery stack), it is determined that the second heat is less than or equal to the first heat, it means that the heat generated by the battery stack cannot make the battery stack reach the target operating temperature in a short time, and it is necessary to reduce the water pump speed and the coolant flow rate flowing through the radiator, and use the heat generated by the battery stack to continuously heat up the battery stack.

[0097] Specifically, the water pump speed is set to a first preset speed. After the water pump speed is set to the first preset speed, a corresponding fixed coolant flow rate is obtained. At this time, the system flow rate is maintained at a low flow rate (fixed coolant flow rate) and the water pump speed is maintained at a low speed (first preset speed).

[0098] Furthermore, the heat dissipation of the radiator and the total heat required for the stack to increase the initial outlet water temperature to the target temperature at the current power are calculated at the first preset speed of the current water pump:

[0099] q1=C×m2×(T0-T2)(7)

[0100] Among them, q1 is the total heat required by the current water pump to heat the fuel cell stack at the first preset speed, C is the specific heat capacity of the coolant, m2 is the first target coolant mass, T0 is the lower limit of the preset water temperature range, and T2 is the initial outlet water temperature of the current fuel cell stack.

[0101] q4=C×m2×(T4-T3)(8)

[0102] Among them, q4 is the heat dissipation of the radiator at the first preset speed of the current water pump, C is the specific heat capacity of the coolant, m2 is the first target coolant mass, T4 is the coolant radiator inlet water temperature, and T3 is the coolant radiator outlet water temperature.

[0103] Furthermore, the heat generated by the intercooler and the heat generated by the fuel cell stack are calculated.

[0104]

[0105] Among them, Q3 is the heat generated by the intercooler, M air is the air mass flow rate, C airis the specific heat capacity of air, T1 is the water temperature at the inlet of the coolant stack, ηC is the efficiency of the air compressor, π is the pressure ratio, r is the air insulation coefficient, T6 is the temperature of the air entering the stack, and T7 is the inlet temperature of the air compressor.

[0106] Q2=N×(mV cell )×I st (10)

[0107] Q2 is the heat generated by the stack, N is the number of cells in the stack, m is the middle value of the high and low calorific values ​​of the stack, V cell is the cell voltage of the battery stack, I st is the stack current.

[0108] Furthermore, the left side of the following equation (11) is computable:

[0109] q1+q4=(Q2+Q3)×t1(11)

[0110] Therefore, according to formula (11), the time t1 required for the stack to rise to the target temperature can be calculated.

[0111] Furthermore, after calculating the first time required for the battery stack to rise to the target temperature, the water pump operates at a first preset speed. After the cumulative operating time reaches the first time, it is re-determined whether the water temperature at the battery stack outlet is less than the lower limit of the preset water temperature range. If so, the water pump is controlled to continue operating based on the first preset speed until the water temperature at the battery stack outlet is in the preset water temperature range.

[0112] Furthermore, in some embodiments, after obtaining the current power of the current engine and the initial outlet water temperature of the current fuel cell stack, it also includes: if the initial outlet water temperature of the current fuel cell stack is in a preset water temperature range, obtaining the inlet water temperature of the engine cooling device and the outlet water temperature of the engine cooling device, and calculating the inlet and outlet temperature difference of the engine cooling device according to the inlet water temperature of the engine cooling device and the outlet water temperature of the engine cooling device; calculating the second target coolant flow rate according to the inlet and outlet temperature difference, and adjusting the current water pump speed of the engine according to the second target coolant flow rate.

[0113] Specifically, if the initial outlet water temperature of the current fuel cell stack is within the preset water temperature range, it means that the fuel cell stack temperature is operating in a relatively reasonable and efficient range. At this time, the temperature sensors (such as Figure 1 The fourth temperature sensor 114 in the heat sink and the temperature sensor at the heat sink outlet (such as Figure 1The third temperature sensor 113 in the radiator obtains the radiator inlet temperature and the radiator outlet temperature, and calculates the second target coolant flow required in real time according to the temperature difference between the radiator inlet temperature and the radiator outlet temperature monitored in real time. In addition, due to the influence of the ambient temperature, the radiator inlet temperature and the radiator outlet temperature will become lower, so at this time, Q2+Q3=Q4.

[0114] Thus, the current water pump speed is calculated according to the second target coolant flow rate, and the water pump speed of the engine is adjusted based on the calculated water pump speed.

[0115] Furthermore, in some embodiments, after obtaining the current power of the current engine and the initial outlet water temperature of the current fuel cell stack, it also includes: if the initial outlet water temperature of the current fuel cell stack is greater than the upper limit of the preset water temperature range, controlling the current water pump to operate based on a second preset speed and a second duration, and re-obtaining a new initial outlet water temperature of the current fuel cell stack, wherein the second preset speed is greater than the first preset speed; if the new initial outlet water temperature of the current fuel cell stack is greater than the upper limit of the preset water temperature range, controlling the engine to shut down, and issuing an over-temperature fault reminder.

[0116] Specifically, if the current initial outlet water temperature of the fuel cell stack is greater than the upper limit of the preset water temperature range, it means that the current initial outlet water temperature of the fuel cell stack is too high and the fuel cell stack needs to be further cooled. Therefore, the water pump speed is increased to the second preset speed, and after the engine water pump runs at the second preset speed for a second time, the new fuel cell stack outlet water temperature is obtained again. If the new current initial outlet water temperature of the fuel cell stack is still greater than the upper limit of the preset water temperature range, it means that the engine is in a state of continuous overtemperature. Therefore, it is determined that the current engine has an overtemperature fault. In order to avoid equipment damage caused by the engine continuing to work under high temperature conditions, the user is reminded of the engine overtemperature fault and the engine is controlled to shut down.

[0117] Further, in some embodiments, after re-obtaining the new initial outlet water temperature of the current fuel cell stack, it also includes: if the new initial outlet water temperature of the current fuel cell stack is less than or equal to the upper limit value of the preset water temperature range, then executing the step of obtaining the inlet water temperature of the engine cooling device and the outlet water temperature of the engine cooling device.

[0118] Specifically, if the new initial outlet water temperature of the current fuel cell stack is less than or equal to the upper limit of the preset water temperature range, it means that the temperature of the fuel cell stack has returned to normal and can continue to work. Therefore, continue to execute the steps of obtaining the inlet water temperature of the engine cooling device and the outlet water temperature of the engine cooling device to calculate the second target coolant flow rate according to the inlet and outlet temperature difference of the engine cooling device, and adjust the current water pump speed of the engine according to the second target coolant flow rate.

[0119] In order to facilitate those skilled in the art to more clearly and intuitively understand the control method of the fuel cell engine of the embodiment of the present application, Figure 3 Provide detailed explanation.

[0120] like Figure 3 As shown, the control method of the fuel cell engine includes the following steps:

[0121] S301, start.

[0122] S302, obtaining the current ambient temperature T.

[0123] S303, determine whether the current ambient temperature T is less than the preset temperature A, if yes, execute S304, otherwise, execute S314.

[0124] S304, the engine enters a low temperature operation mode.

[0125] S305, obtaining the current power P of the engine and the ideal water temperature T0 under the current power.

[0126] S306, obtaining the actual outlet water temperature T2 of the fuel cell stack.

[0127] S307, determine whether the actual outlet water temperature T2 of the fuel cell stack is less than the ideal water temperature T0, if so, execute S308, otherwise, execute S322.

[0128] S308, calculating the first heat Q1 required to raise the actual outlet water temperature T2 of the fuel cell stack to the target temperature.

[0129] S309, calculating the second heat Q2 generated by the fuel cell stack at the current power P.

[0130] S310, determine whether the second heat Q2 is greater than the first heat Q1, if yes, execute S311, otherwise, execute S316.

[0131] S311, calculating the required coolant flow M1.

[0132] S312, adjusting the water pump speed according to the coolant flow M1.

[0133] S313, end.

[0134] S314, the engine enters the normal working mode.

[0135] S315, end.

[0136] S316, setting the water pump speed to B.

[0137] S317, calculating the first time t1 required for the actual outlet water temperature T2 of the fuel cell stack to rise to the target temperature.

[0138] S318, the water pump runs based on the speed B.

[0139] S319, after the accumulated running time of the water pump reaches the first time t1.

[0140] S320, determine whether the actual outlet water temperature T2 of the fuel cell stack is less than the ideal water temperature T0, if so, execute S318 again, otherwise, execute S321.

[0141] S321, determine whether the actual outlet water temperature T2 of the fuel cell stack is less than or equal to the ideal water temperature upper limit T5, if so, execute S322, otherwise, execute S326.

[0142] S322, obtaining the radiator inlet water temperature T3 and the radiator outlet water temperature T4.

[0143] S323, calculating the required coolant flow M3 according to the temperature difference between the inlet and outlet of the radiator.

[0144] S324, adjusting the water pump speed according to the coolant flow rate M3.

[0145] S325, end.

[0146] S326, increase the water pump speed to C.

[0147] S327, after the water pump runs for a second time period t2 based on the rotation speed C.

[0148] S328, re-obtain the stack outlet water temperature T2.

[0149] S329, determine whether the actual outlet water temperature T2 of the fuel cell stack is less than or equal to the ideal water temperature upper limit T5, if so, execute S322, otherwise, execute S330.

[0150] S330, the engine shuts down after an output over-temperature fault.

[0151] S331, end.

[0152] According to the control method of the fuel cell engine proposed in the embodiment of the present application, when the initial outlet water temperature of the current stack is less than the lower limit of the preset water temperature range, the first heat required to increase the initial outlet water temperature to the target temperature is calculated, and the second heat generated by the current stack under the current power of the current engine is calculated; if the second heat is greater than the first heat, the current water pump speed of the engine is adjusted according to the first target coolant flow rate, otherwise, the heat dissipation of the engine cooling device, the third heat required to increase the initial outlet water temperature to the target temperature and the first duration are calculated, and the current water pump is controlled to operate based on the first preset speed and the first duration until the initial outlet water temperature of the current stack is in the preset water temperature range. Thus, by monitoring the water temperature at the outlet of the stack and comparing the outlet water temperature of the stack with the preset water temperature range, the control strategy is adaptively adjusted to prevent the stack from excessive heat dissipation under low temperature conditions, thereby preventing the internal operating temperature of the stack from being too low, so that the stack works within a suitable temperature range, thereby improving the efficiency of the reaction.

[0153] Next, the control device of the fuel cell engine proposed in accordance with the embodiment of the present application will be described with reference to the accompanying drawings.

[0154] Figure 4 It is a block diagram of a control device for a fuel cell engine according to an embodiment of the present application.

[0155] like Figure 4 As shown, the control device 10 of the fuel cell engine includes: an acquisition module 100 , a calculation module 200 and a control module 300 .

[0156] Among them, the acquisition module 100 is used to obtain the current power of the current engine and the initial outlet water temperature of the current fuel cell stack; the calculation module 200 is used to calculate the first heat required to increase the initial outlet water temperature to the target temperature if the initial outlet water temperature of the current fuel cell stack is less than the lower limit of the preset water temperature range, and calculate the second heat generated by the current fuel cell stack under the current power; the control module 300 is used to calculate the first target coolant flow rate if the second heat is greater than the first heat, and adjust the current water pump speed of the engine according to the first target coolant flow rate, otherwise, calculate the heat dissipation of the engine cooling device at the first preset speed of the current water pump, the third heat required to increase the initial outlet water temperature to the target temperature and the first duration, and control the current water pump to operate based on the first preset speed and the first duration until the initial outlet water temperature of the current fuel cell stack is in the preset water temperature range.

[0157] Furthermore, in some embodiments, after obtaining the current power of the current engine and the initial outlet water temperature of the current fuel cell stack, the acquisition module 100 is also used to: if the initial outlet water temperature of the current fuel cell stack is in a preset water temperature range, then obtain the inlet water temperature of the engine cooling device and the outlet water temperature of the engine cooling device, and calculate the inlet and outlet temperature difference of the engine cooling device based on the inlet water temperature of the engine cooling device and the outlet water temperature of the engine cooling device; calculate the second target coolant flow rate based on the inlet and outlet temperature difference, and adjust the current water pump speed of the engine based on the second target coolant flow rate.

[0158] Furthermore, in some embodiments, after obtaining the current power of the current engine and the initial outlet water temperature of the current fuel cell stack, the acquisition module 100 is also used to: if the initial outlet water temperature of the current fuel cell stack is greater than the upper limit of the preset water temperature range, control the current water pump to operate based on a second preset speed and a second duration, and re-acquire a new initial outlet water temperature of the current fuel cell stack, wherein the second preset speed is greater than the first preset speed; if the new initial outlet water temperature of the current fuel cell stack is greater than the upper limit of the preset water temperature range, control the engine to shut down, and issue an over-temperature fault reminder.

[0159] Further, in some embodiments, after re-obtaining the new initial outlet water temperature of the current fuel cell stack, the acquisition module 100 is also used to: if the new initial outlet water temperature of the current fuel cell stack is less than or equal to the upper limit value of the preset water temperature range, then execute the steps of obtaining the inlet water temperature of the engine cooling device and the outlet water temperature of the engine cooling device.

[0160] Furthermore, in some embodiments, before obtaining the current power of the current engine and the initial outlet water temperature of the current fuel cell stack, the acquisition module 100 is also used to: obtain the current ambient temperature; determine whether the current ambient temperature is lower than a preset temperature; if the current ambient temperature is lower than the preset temperature, control the current engine to enter a preset low-temperature operating mode, so as to obtain the current power of the current engine and the initial outlet water temperature of the current fuel cell stack after the current engine enters the preset low-temperature operating mode.

[0161] Furthermore, in some embodiments, the acquisition module 100 is also used to: if the current ambient temperature is greater than or equal to a preset temperature, control the current engine to enter a normal working mode.

[0162] It should be noted that the above explanations of the control method embodiment of the fuel cell engine are also applicable to the control device of the fuel cell engine of this embodiment, and will not be repeated here.

[0163] According to the control device of the fuel cell engine proposed in the embodiment of the present application, when the initial outlet water temperature of the current stack is less than the lower limit of the preset water temperature range, the first heat required to increase the initial outlet water temperature to the target temperature is calculated, and the second heat generated by the current stack under the current power of the current engine is calculated; if the second heat is greater than the first heat, the current water pump speed of the engine is adjusted according to the first target coolant flow rate, otherwise, the heat dissipation of the engine cooling device, the third heat required to increase the initial outlet water temperature to the target temperature and the first duration are calculated, and the current water pump is controlled to operate based on the first preset speed and the first duration until the initial outlet water temperature of the current stack is in the preset water temperature range. Thus, by monitoring the water temperature at the outlet of the stack and comparing the outlet water temperature of the stack with the preset water temperature range, the control strategy is adaptively adjusted to prevent the stack from excessive heat dissipation under low temperature conditions, thereby preventing the internal operating temperature of the stack from being too low, so that the stack works within a suitable temperature range, thereby improving the efficiency of the reaction.

[0164] Figure 5 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application. The vehicle may include:

[0165] A memory 501 , a processor 502 , and a computer program stored in the memory 501 and executable on the processor 502 .

[0166] When the processor 502 executes the program, the control method of the fuel cell engine provided in the above embodiment is implemented.

[0167] Furthermore, the vehicle also includes:

[0168] The communication interface 503 is used for communication between the memory 501 and the processor 502 .

[0169] The memory 501 is used to store computer programs that can be executed on the processor 502 .

[0170] The memory 501 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0171] If the memory 501, the processor 502 and the communication interface 503 are implemented independently, the communication interface 503, the memory 501 and the processor 502 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 5 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0172] Optionally, in a specific implementation, if the memory 501, the processor 502 and the communication interface 503 are integrated on a chip, the memory 501, the processor 502 and the communication interface 503 can communicate with each other through an internal interface.

[0173] The processor 502 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0174] An embodiment of the present application also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the control method of the fuel cell engine as described above is implemented.

[0175] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0176] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0177] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0178] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or N wirings (electronic devices), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0179] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0180] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0181] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0182] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A control method for a fuel cell engine, characterized in that: The following steps are involved: Get the current power of the current engine and the initial outlet water temperature of the current fuel cell stack; If the initial outlet water temperature of the current fuel cell stack is less than the lower limit of the preset water temperature range, the first heat required to increase the initial outlet water temperature to the target temperature is calculated, and the second heat generated by the current fuel cell stack at the current power is calculated; If the second heat is greater than the first heat, the first target coolant flow rate is calculated, and the current water pump speed of the engine is adjusted according to the first target coolant flow rate; otherwise, the heat dissipation of the engine cooling device at the first preset speed of the current water pump, the third heat and the first duration required to increase the initial outlet water temperature to the target temperature are calculated, and the current water pump is controlled to operate based on the first preset speed and the first duration until the initial outlet water temperature of the current fuel cell stack is in the preset water temperature range.

2. The method according to claim 1, characterized in that After obtaining the current power of the current engine and the initial outlet water temperature of the current fuel cell stack, the method further includes: If the initial outlet water temperature of the current fuel cell stack is within the preset water temperature range, the inlet water temperature and the outlet water temperature of the engine cooling device are obtained, and the inlet and outlet temperature difference of the engine cooling device is calculated according to the inlet water temperature and the outlet water temperature of the engine cooling device; A second target coolant flow rate is calculated according to the inlet and outlet temperature difference, and a current water pump speed of the engine is adjusted according to the second target coolant flow rate.

3. The method according to claim 2, characterized in that After obtaining the current power of the current engine and the initial outlet water temperature of the current fuel cell stack, the method further includes: If the initial outlet water temperature of the current fuel cell stack is greater than the upper limit of the preset water temperature range, the current water pump is controlled to operate based on a second preset speed and a second duration, and a new initial outlet water temperature of the current fuel cell stack is re-acquired, wherein the second preset speed is greater than the first preset speed; If the initial outlet water temperature of the new current fuel cell stack is greater than the upper limit of the preset water temperature range, the engine is controlled to shut down and an over-temperature fault reminder is issued.

4. The method according to claim 3, characterized in that After re-obtaining the new initial outlet water temperature of the current fuel cell stack, it also includes: If the initial outlet water temperature of the new current fuel cell stack is less than or equal to the upper limit of the preset water temperature range, the step of obtaining the inlet water temperature of the engine cooling device and the outlet water temperature of the engine cooling device is performed.

5. The method according to claim 1, characterized in that Before obtaining the current power of the current engine and the initial outlet water temperature of the current fuel cell stack, the method further includes: Get the current ambient temperature; Determine whether the current ambient temperature is less than a preset temperature; If the current ambient temperature is lower than the preset temperature, the current engine is controlled to enter a preset low-temperature operating mode, so as to obtain the current power of the current engine and the initial outlet water temperature of the current fuel cell stack after the current engine enters the preset low-temperature operating mode.

6. The method according to claim 5, characterized in that The determining whether the current ambient temperature is less than a preset temperature further includes: If the current ambient temperature is greater than or equal to the preset temperature, the current engine is controlled to enter a normal operating mode.

7. A control device for a fuel cell engine, characterized in that: include: An acquisition module is used to obtain the current power of the current engine and the initial outlet water temperature of the current fuel cell stack; a calculation module, configured to calculate a first amount of heat required to increase the initial outlet water temperature to a target temperature if the initial outlet water temperature of the current stack is less than a lower limit of a preset water temperature range, and calculate a second amount of heat generated by the current stack at the current power; A control module is used to calculate a first target coolant flow rate if the second heat amount is greater than the first heat amount, and adjust the current water pump speed of the engine according to the first target coolant flow rate; otherwise, calculate the heat dissipation of the engine cooling device at a first preset speed of the current water pump, a third amount of heat and a first duration required to increase the initial outlet water temperature to the target temperature, and control the current water pump to operate based on the first preset speed and the first duration until the initial outlet water temperature of the current fuel cell stack is in the preset water temperature range.

8. The device according to claim 7, characterized in that After obtaining the current power of the current engine and the initial outlet water temperature of the current fuel cell stack, the obtaining module is further used to: If the initial outlet water temperature of the current fuel cell stack is within the preset water temperature range, the inlet water temperature and the outlet water temperature of the engine cooling device are obtained, and the inlet and outlet temperature difference of the engine cooling device is calculated according to the inlet water temperature and the outlet water temperature of the engine cooling device; A second target coolant flow rate is calculated according to the inlet and outlet temperature difference, and a current water pump speed of the engine is adjusted according to the second target coolant flow rate.

9. A vehicle, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the control method for the fuel cell engine as claimed in any one of claims 1 to 6.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the control method of the fuel cell engine as described in any one of claims 1 to 6.

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