Control method of heat dissipation system shared by fuel cell and air conditioner, battery vehicle and medium

Abstract

The invention provides a control method of a heat dissipation system shared by a fuel cell and an air conditioner, a battery vehicle and a medium, and the control method comprises the following steps: obtaining an air conditioner demand duty ratio based on air conditioner pressure, evaporator temperature and compressor rotating speed; determining the duty ratio requirement of the first heat dissipation system and the duty ratio requirement of the second heat dissipation system based on the water inlet pile temperature and the water outlet pile temperature; the duty ratio of the first heat dissipation system is selected to be shared with the heat dissipation system of the air conditioner, the duty ratio of the second heat dissipation system is not shared with the heat dissipation system of the air conditioner, and the heat dissipation systems are controlled; judging whether the duty ratio demand of the air conditioner is greater than the duty ratio demand of the first heat dissipation system or not; if yes, the rotating speed of a fuel cell engine water pump and the opening degree of a cooling liquid waterway thermostat are adjusted based on the reduction condition of the water temperature of the fuel engine; according to the air conditioner heat dissipation control method, the material cost can be reduced, the installation space can be saved, and the energy consumption of the whole vehicle can be reduced.

Description

Technical Field

[0001] This invention relates to the field of fuel cell vehicle cooling system control technology, and in particular to a control method for a shared cooling system for fuel cells and air conditioning, a fuel cell vehicle, an electronic device, and a computer-readable medium. Background Technology

[0002] Currently, most hydrogen fuel cell vehicles on the market have separate, independently controlled cooling systems for the hydrogen fuel cell engine and air conditioning. The hydrogen fuel cell engine controls the speed of its cooling system based on its own cooling needs. The air conditioning system controls its cooling system speed based on the cooling needs of its condenser. Because they are independent systems, their temperature control does not interfere with each other, making them relatively easy to manage.

[0003] Existing technology, by independently controlling the speed of each cooling system, necessitates the purchase of two separate cooling systems for the fuel cell engine and air conditioning system. This inevitably increases the cost compared to a shared system. Furthermore, the separate installation locations of these two systems require separate layouts, effectively occupying space for two separate cooling systems. Hydrogen fuel cell vehicles, with their limited space for hydrogen tanks, fuel cell engines, and batteries, are particularly vulnerable to space constraints, making space conservation crucial. In terms of energy consumption, a single cooling system that can cool both the fuel cell engine and air conditioning would save energy and improve energy efficiency. Therefore, separating the cooling systems for the fuel cell engine and air conditioning is not conducive to energy conservation, increases cooling system costs, and also presents significant disadvantages in terms of space utilization. Summary of the Invention

[0004] In view of the above problems, embodiments of the present invention are proposed to provide a control method for a shared heat dissipation system for a fuel cell and an air conditioner, a fuel cell vehicle, an electronic device, and a computer-readable medium to overcome or at least partially solve the above problems.

[0005] This invention discloses a control method for a shared heat dissipation system for fuel cells and air conditioners, characterized by comprising the following steps:

[0006] The vehicle controller calculates the air conditioning demand duty cycle based on air conditioning pressure, evaporator temperature, and compressor speed.

[0007] The hydrogen fuel cell engine controller determines the duty cycle requirements of the first and second cooling systems based on the water inlet and outlet temperatures of the fuel cell stack, and then sends these requirements to the vehicle controller.

[0008] The duty cycle of the first heat dissipation system is shared with that of the air conditioner's heat dissipation system in order to control the heat dissipation system; the duty cycle of the second heat dissipation system is not shared with that of the air conditioner's heat dissipation system in order to control the heat dissipation system.

[0009] The vehicle controller obtains the duty cycle requirements of the first cooling system and the second cooling system, and determines whether the duty cycle requirement of the air conditioning system is greater than the duty cycle requirement of the first cooling system.

[0010] If the value is greater than the value, the speed of the fuel cell engine water pump and the opening of the coolant circuit thermostat will be adjusted based on the decrease in fuel engine water temperature.

[0011] If the value is less than the air conditioner's cooling capacity, adjust the air compressor speed accordingly.

[0012] As a further improvement of the present invention, in the step of the vehicle controller obtaining the required duty cycle of the air conditioning system based on the air conditioning pressure, evaporator temperature, and compressor speed, when the air conditioning pipeline pressure is too high and the compressor speed is too high, the duty cycle of the air conditioning cooling system is increased; when the evaporator temperature is too low, the duty cycle of the air conditioning cooling system is decreased.

[0013] As a further improvement of the present invention, in the step of selecting the duty cycle of the first heat dissipation system to be shared with the heat dissipation system of the air conditioner for controlling the heat dissipation system, the duty cycle of the selected heat dissipation system is calculated and compared with the required duty cycle of the air conditioner, and the maximum value is selected as the input to control the heat dissipation system.

[0014] As a further improvement of the present invention, the step of adjusting the speed of the fuel cell engine water pump and the opening of the coolant circuit thermostat based on the decrease in fuel engine water temperature includes:

[0015] If the fuel cell engine coolant temperature is lower than the target temperature, adjust the speed of the fuel cell engine water pump and the opening of the coolant thermostat.

[0016] As a further improvement of the present invention, the step of adjusting the speed of the fuel cell engine water pump and the opening of the coolant thermostat includes:

[0017] Reduce the speed of the fuel cell engine water pump and decrease the opening of the thermostat in the coolant circuit connected to the cooling system.

[0018] As a further improvement of the present invention, the step of adjusting the speed of the air compressor based on the heat dissipation of the air conditioner includes:

[0019] If the air conditioner is overheating and causing frost to form, adjust the air compressor speed.

[0020] As a further improvement of the present invention, the step of adjusting the speed of the air compressor includes:

[0021] Reduce the speed of the air compressor;

[0022] If the air compressor's real-time speed is at its minimum speed, then start-stop control of the air compressor will be implemented.

[0023] As a further improvement of the present invention, the hydrogen fuel cell engine controller sends the duty cycle of the first cooling system and the duty cycle of the second cooling system to the vehicle controller via CAN communication.

[0024] The present invention also provides a fuel cell vehicle, including a vehicle controller, a hydrogen fuel cell engine controller, a communication interface, a memory, and a communication bus, wherein the vehicle controller, the hydrogen fuel cell engine controller, the communication interface, and the memory communicate with each other through the communication bus;

[0025] The memory is used to store computer programs;

[0026] The vehicle controller and the hydrogen fuel cell engine controller are used to implement the above control method when executing the program stored in the memory.

[0027] The present invention provides one or more computer-readable media having instructions stored thereon that, when executed by one or more processors, cause the processors to perform the control method described above.

[0028] The embodiments of the present invention have the following advantages:

[0029] The present invention discloses a control method for a shared cooling system between a fuel cell and an air conditioner. This method enables the fuel cell and air conditioner to share a cooling system, reducing material costs, saving installation space, and lowering overall vehicle energy consumption. The invention compares the required duty cycle of the air conditioner with that of the fuel cell engine. Based on different comparison results, different control methods are employed. When the required duty cycle of the air conditioner is greater than that of the fuel cell engine, the speed of the fuel cell engine water pump and the opening of the coolant thermostat are adjusted based on the decrease in the fuel cell engine's coolant temperature. This reduces the impact of the cooling system fan on the fuel cell engine's coolant temperature, maintaining it at the target temperature. When the required duty cycle of the air conditioner is less than that of the fuel cell engine, the speed of the air compressor is adjusted based on the air conditioner's cooling performance, maintaining the evaporator temperature at a reasonable level. Attached Figure Description

[0030] Figure 1 This is a flowchart of the control method described in this invention;

[0031] Figure 2This is another step of the control method described in this invention. Detailed Implementation

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Reference Figure 1 and Figure 2 This invention illustrates a control method for a shared heat dissipation system for a fuel cell and an air conditioner, comprising the following steps:

[0034] Step S1: The vehicle controller obtains the required duty cycle of the air conditioning system based on the air conditioning pressure, evaporator temperature, and compressor speed. When the air conditioning pipeline pressure is too high and the compressor speed is too high, the duty cycle of the air conditioning cooling system is increased; when the evaporator temperature is too low, the duty cycle of the air conditioning cooling system is decreased.

[0035] Step S2: The hydrogen fuel cell engine controller determines the duty cycle requirements of the first cooling system and the second cooling system based on the water inlet temperature and water outlet temperature. The first cooling system duty cycle and the second cooling system duty cycle are sent to the vehicle controller via CAN communication. The duty cycle of the first cooling system is the required duty cycle of the fuel cell engine.

[0036] Step S3: Select the duty cycle of the first heat dissipation system to share with the air conditioner's heat dissipation system in order to control the heat dissipation system, i.e., control n2 fans. Select the duty cycle of the second heat dissipation system to not share with the air conditioner's heat dissipation system. Calculate the duty cycle of the selected heat dissipation system and compare it with the required duty cycle of the air conditioner. Select the maximum value as input in order to control the heat dissipation system, i.e., control n1 fans.

[0037] The number N of fans in the cooling system that meets the maximum heat dissipation requirements of the fuel cell engine is determined by the maximum heat dissipation demand.

[0038] The number of fans, n, in the cooling system that meets the maximum heat dissipation demand of the air conditioner is determined by the maximum heat dissipation demand.

[0039] Because the heat generated by a hydrogen fuel cell engine far exceeds the heat dissipation requirements of an air conditioning condenser, the total heat dissipation demand of a hydrogen fuel cell engine is often greater than that of an air conditioning condenser, especially for large hydrogen fuel cell commercial vehicles. Therefore, group control needs to be considered in the cooling system control. For example, meeting the heat dissipation requirements of a hydrogen fuel cell engine might require a cooling system consisting of eight fans, while meeting the heat dissipation requirements of an air conditioning condenser only requires a cooling system consisting of two fans. In this case, the hydrogen fuel cell engine cooling system needs to consider two separate groups of duty cycle (PWM) control. Two of the eight fans in the hydrogen fuel cell engine cooling system are shared with the air conditioning condenser, while the remaining six fans are controlled separately by the hydrogen fuel cell engine controller (FCU). The purpose of this is to meet the heat dissipation requirements of the air conditioning condenser without excessively affecting the temperature control of the hydrogen fuel cell, which has relatively high temperature control requirements, generally within ±2 degrees Celsius. If the air conditioning duty cycle is not grouped or is not properly grouped, when the air conditioning duty cycle is greater than the heat dissipation requirement of the hydrogen fuel cell engine at low power or idle power, a group of duty cycles controlling 8 fans will lower the infeed temperature of the hydrogen fuel cell very low, resulting in large fluctuations in the infeed water temperature, deviating from the target water temperature, and affecting the service life of the hydrogen fuel cell engine.

[0040] Specifically, in the step of selecting a cooling system whose duty cycle is shared with the air conditioning cooling system to control several fans, the duty cycle of the selected cooling system is compared with the required duty cycle of the air conditioning, and the maximum value is selected as the input to control several fans. The number N of cooling system fans that meet the cooling requirements of the fuel cell engine is divided into two groups for control, and the duty cycle of each group can be adjusted independently. One group has n1 = Nn fans, and the other group has n2 = n fans, where n2 is the number of cooling system fans shared by the hydrogen fuel cell engine and the air conditioning.

[0041] Connect the two sets of cooling system fan control wires to the two duty cycle output pins of the vehicle controller. The vehicle controller integrates the duty cycle requirements of the fuel cell engine and the air conditioning system to control the fan speed.

[0042] Step S4: The vehicle controller obtains the duty cycle requirements of the first cooling system and the second cooling system, and determines whether the duty cycle requirement of the air conditioning system is greater than the duty cycle requirement of the first cooling system.

[0043] Step S5: If the temperature is greater than the target temperature, adjust the speed of the fuel cell engine water pump and the opening of the coolant circuit thermostat based on the decrease in fuel cell engine water temperature; if the fuel cell engine water temperature is lower than the target water temperature, reduce the speed of the fuel cell engine water pump and reduce the opening of the coolant circuit thermostat connected to the cooling system.

[0044] In this step, when the required air conditioning duty cycle is greater than that of the hydrogen fuel cell engine, the shared cooling system fan selects the maximum duty cycle of both to control its speed. Therefore, it's necessary to determine whether the fuel cell engine coolant temperature is dropping too quickly or below the target temperature. If the temperature drops too quickly, the coolant pump speed of the hydrogen fuel cell engine is reduced to slow down the heat exchange rate. Simultaneously, the thermostat opening in the cooling pipes of the hydrogen fuel cell engine is reduced, decreasing the amount of coolant flowing through the cooling system fan. This reduces the impact of the cooling system fan on the fuel cell engine coolant temperature, maintaining it at the target temperature.

[0045] Step S6: If the speed is less than the air conditioner's heat dissipation, adjust the air compressor speed based on the air conditioner's heat dissipation. If the air conditioner's heat dissipation is too high, causing frost to form, reduce the air compressor speed; if the air compressor's real-time speed is at its minimum, control the air compressor's start / stop.

[0046] When the required duty cycle of the air conditioner is less than that required by the hydrogen fuel cell engine, it is necessary to determine whether the heat output to the air conditioner is excessive, and then whether the evaporator temperature is too cold and whether there is a risk of frost formation on the evaporator. If there is a risk of frost formation, the air conditioner compressor speed should be reduced in advance. If the evaporator temperature is still too low even when the air conditioner compressor speed is adjusted to the minimum, the evaporator temperature should be maintained at a reasonable level through compressor start-stop control.

[0047] The above control method can solve the problem of unstable temperature control caused by the hydrogen fuel cell and air conditioning sharing a cooling system. This invention satisfies the air conditioning's cooling requirements, reducing frost formation due to overcooling, while simultaneously ensuring more stable temperature control of the hydrogen fuel cell, preventing overshoot in the hydrogen fuel cell engine's temperature control due to air conditioning intervention. Because the hydrogen fuel cell engine and air conditioning share a cooling system, material costs are reduced, installation space is saved, and overall vehicle energy consumption is lowered.

[0048] In addition, the present invention also provides a fuel cell vehicle. In order to meet the above control method, the present invention has made adaptive improvements to the number of heat dissipation systems in the fuel cell vehicle. The number of heat dissipation systems should meet the maximum heat dissipation requirements.

[0049] The fuel cell vehicle includes a vehicle controller, a hydrogen fuel cell engine controller, a communication interface, a memory, and a communication bus. The vehicle controller, the hydrogen fuel cell engine controller, the communication interface, and the memory communicate with each other through the communication bus. The memory stores computer programs. When the controller and the hydrogen fuel cell engine controller execute the programs stored in the memory, they implement the control method described above.

[0050] The communication bus mentioned above can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. This communication bus can be divided into address bus, data bus, control bus, etc.

[0051] The communication interface is used for communication between the aforementioned terminal and other devices.

[0052] The memory may include random access memory (RAM) or non-volatile memory, such as at least one disk storage device. Optionally, the memory may also be at least one storage device located remotely from the aforementioned processor.

[0053] The processors mentioned above can be general-purpose processors, including central processing units (CPUs), network processors (NPs), etc.; they can also be digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0054] The present invention also provides a computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform the aforementioned control method.

[0055] In one embodiment of the present invention, a computer program product containing instructions is also provided, which, when run on a computer, causes the computer to execute the aforementioned control method.

[0056] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present invention are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid state disk (SSD)).

[0057] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0058] The various embodiments in this specification are described in a related manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A control method of a fuel cell and air conditioner common heat radiating system, characterized by, The method comprises the steps of: The vehicle controller obtains the air conditioner demand duty ratio based on the air conditioner pressure, evaporator temperature and compressor speed; The hydrogen fuel cell engine controller confirms the first heat dissipation system duty ratio and the second heat dissipation system duty ratio based on the water inlet temperature and the water outlet temperature, and sends them to the vehicle controller; The first heat dissipation system duty ratio is selected to be shared with the air conditioner heat dissipation system for controlling the heat dissipation system, and the second heat dissipation system duty ratio is not selected to be shared with the air conditioner heat dissipation system for controlling the heat dissipation system; The vehicle controller obtains the first heat dissipation system duty ratio and the second heat dissipation system duty ratio, and judges whether the air conditioner duty ratio is greater than the first heat dissipation system duty ratio; If so, the speed of the fuel cell engine water pump and the opening degree of the coolant water path thermostat are adjusted based on the fuel engine water temperature drop; If not, the speed of the air compressor is adjusted based on the air conditioner heat dissipation condition.

2. The control method according to claim 1, characterized by In the step of obtaining the air conditioner demand duty ratio based on the air conditioner pressure, evaporator temperature and compressor speed, when the air conditioner pipeline pressure is too large and the compressor speed is too high, the air conditioner heat dissipation system duty ratio is increased; When the evaporator temperature is too low, the air conditioner heat dissipation system duty ratio is decreased.

3. The control method according to claim 1, characterized by, In the step of selecting the first heat dissipation system duty ratio to be shared with the air conditioner heat dissipation system for controlling the heat dissipation system, the selected heat dissipation system duty ratio is compared with the air conditioner demand duty ratio, and the maximum value is selected as the input for controlling the heat dissipation system.

4. The control method according to claim 1, characterized by, The step of adjusting the speed of the fuel cell engine water pump and the opening degree of the coolant water path thermostat based on the fuel engine water temperature drop comprises: If the fuel engine water temperature is lower than the target water temperature, the speed of the fuel cell engine water pump and the opening degree of the coolant water path thermostat are adjusted.

5. The control method according to claim 1 or 4, characterized by, The step of adjusting the speed of the fuel cell engine water pump and the opening degree of the coolant water path thermostat comprises: The speed of the fuel cell engine water pump is decreased, and the opening degree of the coolant water path thermostat connected with the heat dissipation system is adjusted.

6. The control method according to claim 1, characterized by The step of adjusting the speed of the air compressor based on the air conditioner heat dissipation condition comprises: If the air conditioner heat dissipation condition is too large, causing the air conditioner to frost, the speed of the air compressor is adjusted.

7. The control method according to claim 1 or 6, characterized by, The step of adjusting the speed of the air compressor comprises: The speed of the air compressor is adjusted; If the real-time speed of the air compressor is the minimum speed, the air compressor is started and stopped.

8. The control method according to claim 1, characterized by, The hydrogen fuel cell engine controller sends the first heat dissipation system duty ratio and the second heat dissipation system duty ratio to the vehicle controller through CAN communication.

9. A fuel cell vehicle characterized by comprising: The vehicle controller, the hydrogen fuel cell engine controller, the communication interface, the memory and the communication bus are used to complete the communication among each other; The memory is used to store the computer program; The vehicle controller and the hydrogen fuel cell engine controller are used to execute the program stored in the memory, so as to realize the control method according to any one of claims 1-8.

10. One or more computer-readable media having instructions stored thereon that, when executed by one or more processors, cause the processors to perform the control method of any of claims 1-8.

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