An integrated vehicle-mounted fuel cell thermal management system and control method thereof

Abstract

The present invention belongs to the technical field of electric vehicles, and proposes an integrated vehicle-mounted fuel cell thermal management system and a control method thereof. The fuel cell engine and the radiator are directly connected through a pipeline to obtain a main cooling circulation subsystem of the fuel cell engine; and the accessories, motor controller, integrated power supply, drive motor and radiator integrated in the fuel cell engine are connected through a pipeline to obtain an auxiliary cooling and motor cooling circulation subsystem of the fuel cell engine; the cooling water in the fuel cell engine is directly circulated into the radiator for cooling, thereby ensuring the heat dissipation requirement of the fuel cell engine with a higher heat dissipation temperature requirement. At the same time, the accessories, motor controller, integrated power supply and drive motor with a lower heat dissipation temperature requirement can meet their heat dissipation requirements through the same cooling circulation system on the basis of high integration. During the integrated design, high integration is achieved according to the level of heat dissipation requirements, which can well meet the heat dissipation requirements.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric vehicles, and in particular relates to an integrated vehicle-mounted fuel cell thermal management system and a control method thereof. Background Art

[0002] The development of new energy vehicles can effectively promote energy conservation and emission reduction, and promote the prevention and control of air pollution. Compared with pure electric vehicles, hydrogen fuel cells have advantages such as long driving range and short energy refueling time, and are one of the development directions of the power system technology route in the automotive industry.

[0003] Vehicles equipped with hydrogen fuel cell engines need to design multiple sets of cooling water circulation circuits, and cooling water circulation designs must be performed separately for components with different heat dissipation requirements. Common design methods include multiple cooling water circulation systems such as the fuel cell main cooling cycle, the fuel cell auxiliary cooling cycle, and the drive motor cooling cycle. There are problems such as a large number of components, dispersion, and high energy consumption. The main difficulty currently restricting the integrated design of cooling water circulation circuits is that after integration, the integration cannot meet the different heat dissipation requirements of objects well, and the integrated circulating water circuit requires complex control logic coordination to achieve heat dissipation for multiple objects. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes an integrated vehicle-mounted fuel cell thermal management system and a control method thereof. The cooling water in the fuel cell engine is directly circulated into the radiator for cooling, thereby ensuring the heat dissipation requirements of the fuel cell engine with higher heat dissipation temperature requirements. At the same time, accessories, motor controllers, integrated power supplies and drive motors with lower heat dissipation temperature requirements can meet their heat dissipation requirements through the same cooling circulation system on the basis of high integration. During the integrated design, high integration is achieved according to the level of heat dissipation requirements, and after integration, the heat dissipation requirements of different objects can be well met, and the control difficulty is not large.

[0005] In order to achieve the above objectives, in a first aspect, the present invention provides an integrated vehicle-mounted fuel cell thermal management system, which adopts the following technical solutions:

[0006] An integrated vehicle-mounted fuel cell thermal management system includes a fuel cell engine main cooling circulation subsystem, and a fuel cell engine auxiliary cooling and motor cooling circulation subsystem;

[0007] The fuel cell engine main cooling circulation subsystem is a circulation loop that directly connects the fuel cell engine and the radiator through a pipeline; the fuel cell engine auxiliary cooling and motor cooling circulation subsystem is a circulation loop that connects the accessories integrated in the fuel cell engine, the motor controller, the integrated power supply, the drive motor and the radiator through a pipeline;

[0008] The radiator is connected to a controller, which is configured to control the radiator according to the water temperature of the fuel cell engine, the temperature of accessories integrated into the fuel cell engine, the temperature of the motor controller, the temperature of the integrated power supply and the temperature of the drive motor.

[0009] Furthermore, the radiator is an integrated radiator; the core of the radiator isolates the cooling water in the main cooling circulation subsystem of the fuel cell engine, and the cooling water in the auxiliary cooling and motor cooling circulation subsystem of the fuel cell engine; a cooling fan is arranged in the radiator, and the cooling fan distributes the cooling air to the core of the radiator through a partition to isolate the cooling water in the main cooling circulation subsystem of the fuel cell engine, and the cooling water in the auxiliary cooling and motor cooling circulation subsystem of the fuel cell engine.

[0010] Furthermore, the motor controller, the integrated circuit and the drive motor are connected in series in sequence through a pipeline.

[0011] Furthermore, a first tee is provided on the pipe between the integrated circuit and the drive motor; the radiator, the motor controller and the accessories integrated with the fuel cell engine are connected with the second tee through the pipe, and the accessories integrated with the fuel cell engine are connected with the first tee through the pipe.

[0012] Furthermore, a water pump is provided between the radiator and the second tee.

[0013] Furthermore, the radiator is connected to an expansion tank.

[0014] In order to achieve the above-mentioned purpose, in a second aspect, the present invention also provides an integrated vehicle-mounted fuel cell thermal management system control method, which adopts the following technical solution:

[0015] A method for controlling an integrated vehicle-mounted fuel cell thermal management system adopts the integrated vehicle-mounted fuel cell thermal management system as described in the first aspect, including: controlling the radiator according to the water temperature of the fuel cell engine, and the temperature of accessories integrated into the fuel cell engine, the temperature of the motor controller, the temperature of the integrated power supply and the temperature of the drive motor.

[0016] Furthermore, when at least one of the drive motor temperature, the motor controller temperature, the integrated power supply temperature and the temperature of the accessories integrated into the fuel cell engine is greater than the corresponding preset temperature value, the fuel cell engine auxiliary cooling and motor cooling circulation subsystem is started.

[0017] Furthermore, when the water temperature of the fuel cell engine is greater than the first preset temperature and the water temperature remains unchanged, the fan duty cycle increases by the first preset duty cycle every preset time; when the water temperature of the fuel cell engine is equal to the second preset temperature, the first preset duty cycle is reduced every preset time; when the water temperature of the fuel cell engine is lower than the second preset temperature, the main cooling circulation subsystem of the fuel cell engine stops; the first preset temperature is higher than the second preset temperature.

[0018] Furthermore, when the water temperature of the fuel cell engine is greater than the first preset temperature, the duty cycle is increased by a second preset duty cycle every time the water temperature increases by a temperature measurement value; the second preset duty cycle is greater than the first preset duty cycle.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] In the present invention, the fuel cell engine and the radiator are directly connected through a pipeline to obtain a main cooling circulation subsystem of the fuel cell engine; and the accessories, motor controller, integrated power supply, drive motor and radiator integrated in the fuel cell engine are connected through a pipeline to obtain an auxiliary cooling and motor cooling circulation subsystem of the fuel cell engine; the cooling water in the fuel cell engine is directly circulated into the radiator for cooling, thereby ensuring the heat dissipation requirement of the fuel cell engine with higher heat dissipation temperature requirements. At the same time, the accessories, motor controller, integrated power supply and drive motor with lower heat dissipation temperature requirements can meet their heat dissipation requirements on the basis of high integration through the same cooling circulation system. During the integrated design, high integration is achieved according to the level of heat dissipation requirements, and after integration, the heat dissipation requirements of different objects can be well met, and the control difficulty is not large. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings in the specification that constitute a part of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments of this embodiment and their descriptions are used to explain this embodiment and do not constitute improper limitations on this embodiment.

[0022] Figure 1 This is a schematic diagram of the system structure of Embodiment 1 of the present invention;

[0023] Figure 2 This is a schematic diagram of controller connection according to Embodiment 1 of the present invention;

[0024] Among them, 1. fuel cell engine; 2. radiator; 3. expansion tank; 4. motor controller; 5. integrated circuit; 6. first three-way; 7. drive motor; 8. water pump; 9. second three-way; 10. controller. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0027] Embodiment 1:

[0028] like Figure 1 As shown, this embodiment provides an integrated vehicle-mounted fuel cell thermal management system that integrates the fuel cell engine cooling system and the motor cooling system, solves the problem of high energy consumption when multiple systems work simultaneously, reduces the number of parts, reduces the weight of the vehicle, saves costs, and provides a reliable solution for reducing costs and increasing efficiency of the vehicle. The system includes a fuel cell engine main cooling circulation subsystem, and a fuel cell engine auxiliary cooling and motor cooling circulation subsystem; the fuel cell engine main cooling circulation subsystem is Figure 1 The thick line represents the circulation loop part, and the fuel cell engine auxiliary cooling and motor cooling circulation subsystem is Figure 1 The thin line represents the circulation loop part; the fuel cell engine main cooling circulation subsystem can be understood as a high-temperature cooling circulation water circuit, and the fuel cell engine auxiliary cooling and motor cooling circulation subsystem can be understood as a low-temperature cooling circulation water circuit;

[0029] The fuel cell engine main cooling circulation subsystem is a circulation loop that directly connects the fuel cell engine and the radiator through a pipeline; the fuel cell engine auxiliary cooling and motor cooling circulation subsystem is a circulation loop that connects the accessories integrated in the fuel cell engine, the motor controller, the integrated power supply, the drive motor and the radiator through a pipeline;

[0030] The radiator is connected to a controller, which is configured to control the radiator according to the water temperature of the fuel cell engine, the temperature of accessories integrated into the fuel cell engine, the temperature of the motor controller, the temperature of the integrated power supply and the temperature of the drive motor.

[0031] This embodiment effectively integrates multiple cooling systems, and performs thermal management on the high-temperature cooling water circuit and the low-temperature cooling water circuit respectively under the condition of ensuring a high degree of integration; it significantly simplifies the complexity of the layout scheme for the independent operation of multiple systems, thereby achieving the goal of reducing the weight of the entire vehicle, saving manufacturing costs, and improving the economy of the vehicle. Specifically, the cooling water in the fuel cell engine is directly circulated into the radiator for cooling, which ensures the heat dissipation requirements of the fuel cell engine with higher heat dissipation temperature requirements. At the same time, the accessories, motor controllers, integrated power supplies, and drive motors with lower heat dissipation temperature requirements can meet their heat dissipation requirements through the same cooling circulation system on the basis of high integration. The integrated design is highly integrated according to the level of heat dissipation requirements, and after integration, it can well meet the heat dissipation requirements of different objects, and the control difficulty is not great.

[0032] The heat generated by the hydrogen stack reaction of a hydrogen fuel cell engine is relatively high, which is quite different from the operating temperature of other components that require heat exchange. Other components that require heat exchange are not connected in series or parallel in its circulating water circuit. Instead, the cooling water is circulated directly into the radiator for cooling, ensuring the heat dissipation effect of the hydrogen fuel cell engine.

[0033] The radiator is a two-in-one radiator, which is an integrated radiator. Its core isolates high-temperature cooling water from low-temperature cooling water. The installed electronic cooling fan reasonably distributes the air volume blowing through the radiator core through the partition to cool down the cooling water of different temperatures in the core. Specifically, the radiator is an integrated radiator; the core of the radiator isolates the cooling water in the main cooling circulation subsystem of the fuel cell engine, and the cooling water in the auxiliary cooling and motor cooling circulation subsystem of the fuel cell engine; a cooling fan is set in the radiator, and the cooling fan distributes the cooling air to the core of the radiator through the partition to cool the cooling water in the main cooling circulation subsystem of the fuel cell engine, and the cooling water in the auxiliary cooling and motor cooling circulation subsystem of the fuel cell engine.

[0034] Optionally, the motor controller, the integrated circuit and the drive motor are connected in series in sequence through pipelines. Specifically, the cooling cycle from the motor controller to the integrated power supply to the drive motor is a motor cooling system. This circulation system connects the working temperature components in series from low to high, and the cooling water is finally heated up at the drive motor and then connected to the radiator for cooling. The air compressor and other accessories integrated in the hydrogen fuel cell engine require a small amount of heat exchange, are not connected to the main cooling circulation water circuit, and are designed with independent inlet and outlet water interfaces. As an auxiliary cooling cycle for the fuel cell engine, the cooling cycle can be designed in parallel with the motor controller and the integrated power supply, and its flow is distributed by controlling the second tee section. The parallel water circuit passes through the two branches and then merges through the first tee again and enters the drive motor. After cooling the drive motor, it is connected to the radiator to cool the cooling water. This cooling water cycle is the auxiliary cooling and motor cooling cycle of the fuel cell engine.

[0035] Optionally, a first tee is provided on the pipeline between the integrated circuit and the drive motor; the radiator, the motor controller and the accessories integrated with the fuel cell engine are connected to the second tee through the pipeline, and the accessories integrated with the fuel cell engine are connected to the first tee through the pipeline. A water pump is provided between the radiator and the second tee. The radiator is connected to an expansion tank.

[0036] This embodiment integrates the above two cooling circulation water circuits into the same cooling module for heat dissipation, thereby greatly improving the space utilization rate in the vehicle layout process, reducing the number of parts, and making a significant contribution to the lightweighting of the entire vehicle and energy conservation and emission reduction.

[0037] Embodiment 2:

[0038] This embodiment provides an integrated vehicle-mounted fuel cell thermal management system control method, which adopts the integrated vehicle-mounted fuel cell thermal management system as described in Example 1, including: controlling the radiator according to the water temperature of the fuel cell engine, and the temperature of the accessories integrated in the fuel cell engine, the temperature of the motor controller, the temperature of the integrated power supply and the temperature of the drive motor.

[0039] Optionally, when at least one of the drive motor temperature, the motor controller temperature, the integrated power supply temperature and the temperature of accessories integrated into the fuel cell engine is greater than the corresponding preset temperature value, the fuel cell engine auxiliary cooling and motor cooling circulation subsystem is started.

[0040] Optionally, when the water temperature of the fuel cell engine is greater than a first preset temperature and the water temperature remains unchanged, the fan duty cycle increases by a first preset duty cycle at preset time intervals; when the water temperature of the fuel cell engine is equal to a second preset temperature, the first preset duty cycle is reduced at preset time intervals; when the water temperature of the fuel cell engine is less than the second preset temperature, the main cooling circulation subsystem of the fuel cell engine stops; the first preset temperature is greater than the second preset temperature.

[0041] Optionally, when the water temperature of the fuel cell engine is greater than a first preset temperature, the duty cycle is increased by a second preset duty cycle every time the water temperature increases by a temperature measurement value; the second preset duty cycle is greater than the first preset duty cycle.

[0042] Embodiment 3:

[0043] Based on Example 2, this example provides an integrated vehicle-mounted fuel cell thermal management system control method, which uses the integrated vehicle-mounted fuel cell thermal management system in Example 1. The vehicle controller controls the fan speed corresponding to the motor cooling cycle of the heat dissipation module according to the messages sent by the motor, motor controller, integrated power supply, air compressor, etc., to achieve thermal management of the fuel cell engine auxiliary cooling and the motor cooling cycle.

[0044] The fan is controlled by the temperature of the drive motor: Start: the drive motor temperature is greater than 80°C; Stop: the drive motor temperature is less than 60°C.

[0045] The fan is controlled by the motor controller temperature: Start: motor controller temperature > 65°C; Stop: motor controller temperature < 55°C.

[0046] The fan is controlled by the integrated power supply temperature: Start: integrated power supply temperature > 65°C; Stop: integrated power supply temperature < 55°C.

[0047] The fan is controlled by the air compressor temperature: Start: air compressor temperature > 55°C; Stop: air compressor temperature < 45°C. The above logic stops when all stop conditions are met; starts when one start condition is met.

[0048] The vehicle controller controls the fan speed corresponding to the main cooling cycle of the heat dissipation module according to the message sent by the fuel cell engine, thereby realizing thermal management of the main cooling cycle of the hydrogen fuel cell.

[0049] The fan is controlled by the fuel cell engine temperature: after the radiator fan is turned on, the fuel cell engine water temperature is determined every 3 seconds.

[0050] When the fuel cell engine water temperature is greater than 63°C, if the water temperature remains unchanged, the duty cycle increases by 1 every 3 seconds; if the water temperature increases by 1°C, the duty cycle increases by 10.

[0051] When the fuel cell engine water temperature is equal to 62°C, the duty cycle remains unchanged. When the fuel cell engine water temperature is equal to 62°C, the duty cycle decreases by 1 every 3 seconds.

[0052] When the fuel cell engine water temperature is less than 62°C, the radiator fan stops.

[0053] The above description is only a preferred embodiment of the present embodiment and is not intended to limit the present embodiment. For those skilled in the art, the present embodiment may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment shall be included in the protection scope of the present embodiment.

Claims

1. An integrated vehicle-mounted fuel cell thermal management system, characterized in that: It includes a fuel cell engine main cooling circulation subsystem, and a fuel cell engine auxiliary cooling and motor cooling circulation subsystem; The fuel cell engine main cooling circulation subsystem is a circulation loop that directly connects the fuel cell engine and the radiator through a pipeline; the fuel cell engine auxiliary cooling and motor cooling circulation subsystem is a circulation loop that connects the accessories integrated in the fuel cell engine, the motor controller, the integrated power supply, the drive motor and the radiator through a pipeline; The radiator is connected to a controller, which is configured to control the radiator according to the water temperature of the fuel cell engine, and the temperature of accessories integrated into the fuel cell engine, the temperature of the motor controller, the temperature of the integrated power supply, and the temperature of the drive motor.

2. The integrated vehicle-mounted fuel cell thermal management system according to claim 1, characterized in that: The radiator is an integrated radiator; the core of the radiator isolates the cooling water in the main cooling circulation subsystem of the fuel cell engine and the cooling water in the auxiliary cooling and motor cooling circulation subsystem of the fuel cell engine; a cooling fan is arranged in the radiator, and the cooling fan distributes the cooling air to the core of the radiator through a partition to isolate the cooling water in the main cooling circulation subsystem of the fuel cell engine and the cooling water in the auxiliary cooling and motor cooling circulation subsystem of the fuel cell engine.

3. The integrated vehicle-mounted fuel cell thermal management system according to claim 1, characterized in that: The motor controller, the integrated circuit and the drive motor are connected in series in sequence through a pipeline.

4. The integrated vehicle-mounted fuel cell thermal management system according to claim 3, characterized in that: A first tee is provided on the pipeline between the integrated circuit and the drive motor; the radiator, the motor controller and the accessories integrated with the fuel cell engine are connected to the second tee through the pipeline, and the accessories integrated with the fuel cell engine are connected to the first tee through the pipeline.

5. The integrated vehicle-mounted fuel cell thermal management system according to claim 4, characterized in that: A water pump is arranged between the radiator and the second three-way connection.

6. The integrated vehicle-mounted fuel cell thermal management system according to claim 1, characterized in that: The radiator is connected with an expansion tank.

7. A control method for an integrated vehicle-mounted fuel cell thermal management system, characterized in that: An integrated vehicle-mounted fuel cell thermal management system as described in any one of claims 1 to 6 is adopted, including: controlling the radiator according to the water temperature of the fuel cell engine, and the temperature of accessories integrated into the fuel cell engine, the temperature of the motor controller, the temperature of the integrated power supply and the temperature of the drive motor.

8. The integrated vehicle-mounted fuel cell thermal management system control method according to claim 7, characterized in that: When at least one of the drive motor temperature, the motor controller temperature, the integrated power supply temperature and the temperature of the accessories integrated into the fuel cell engine is greater than the corresponding preset temperature value, the fuel cell engine auxiliary cooling and motor cooling circulation subsystem is started.

9. The integrated vehicle-mounted fuel cell thermal management system control method according to claim 7, characterized in that: When the fuel cell engine water temperature is greater than the first preset temperature and the water temperature remains unchanged, the fan duty cycle increases by the first preset duty cycle every preset time; when the fuel cell engine water temperature is equal to the second preset temperature, the first preset duty cycle is reduced every preset time; when the fuel cell engine water temperature is less than the second preset temperature, the fuel cell engine main cooling circulation subsystem stops; The first preset temperature is greater than the second preset temperature.

10. The integrated vehicle-mounted fuel cell thermal management system control method according to claim 9, characterized in that: When the water temperature of the fuel cell engine is greater than the first preset temperature, the duty cycle is increased by a second preset duty cycle every time the water temperature increases by a temperature measurement value; the second preset duty cycle is greater than the first preset duty cycle.

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