Gas-electric vehicle thermal management method

Abstract

The invention is applicable to the field of gas-electric vehicles, and discloses a gas-electric vehicle thermal management method which comprises the following steps: when a fuel cell is in a working state and the running state of the fuel cell is full-power running, if an air conditioner starting signal is received, acquiring the temperature of an air conditioner condenser, and if the temperature of the air conditioner condenser is kept within a first preset temperature range value, starting the air conditioner condenser; if the temperature of the air conditioner condenser is lower than or equal to the preset condensation temperature and the holding time is longer than a first preset time length, adjusting the air conditioner compressor according to the compressor mode, and after adjustment, if the temperature of the air conditioner condenser is lower than or equal to the preset condensation temperature and the holding time is longer than a second preset time length, closing the air conditioner compressor until the temperature of the air conditioner condenser is within a first preset temperature range value, if yes, starting an air-conditioning compressor; and when the fuel cell is in the non-working state, if the air conditioner starting signal is received, the air conditioner compressor is started, the power and the rotating speed of the air conditioner compressor are adjusted in real time, and the air conditioner compressor can be effectively managed according to different conditions.

Description

Technical Field

[0001] The present invention relates to the field of fuel-electric vehicles, and in particular to a thermal management method for fuel-electric vehicles. Background Art

[0002] In the existing thermal management system of fuel-electric vehicles (i.e. fuel cell electric vehicles), the operation of the air conditioning system is often disconnected to a certain extent from the working state of the fuel cell and the overall energy efficiency management of the vehicle. Specifically, there are several major problems in the existing technology:

[0003] Low energy efficiency: When the fuel cell is running at full power, the vehicle's energy demand reaches its peak. At this time, if the air conditioning system is running in a fixed mode, especially when the air conditioning compressor continues to work without considering the fuel cell load, it may increase the vehicle's energy consumption and reduce the overall energy efficiency. Especially in high temperature environments, the air conditioning condenser may overheat and require higher energy consumption to maintain the temperature inside the vehicle, further exacerbating energy waste.

[0004] Single thermal management strategy: Traditional thermal management systems often use fixed power and speed settings when controlling air-conditioning compressors and fans, and lack a dynamic adjustment mechanism based on the working state of the fuel cell and the outlet and inlet water temperatures of the fuel cell. This single control strategy cannot effectively meet the thermal management requirements under different working conditions.

[0005] Therefore, the existing technology still needs to be developed and improved. Summary of the invention

[0006] The object of the present invention is to provide a thermal management method for a fuel-electric vehicle, which avoids unnecessary energy consumption and improves energy utilization efficiency by intelligently monitoring and adjusting the operating state of an air-conditioning compressor.

[0007] To achieve the above object, the solution provided by the present invention is:

[0008] A method for thermal management of a fuel-electric vehicle comprises: obtaining the working state of a fuel cell; when the fuel cell is in the working state and the operating state of the fuel cell is full-power operation, if an air-conditioning start signal is received, the temperature of an air-conditioning condenser is obtained, if the temperature of the air-conditioning condenser is maintained within a first preset temperature range value and the holding time is greater than a first preset time length, the air-conditioning compressor is adjusted according to a preset compressor mode, and after adjusting the air-conditioning compressor, the temperature of the air-conditioning condenser continues to be obtained, if the temperature of the air-conditioning condenser is lower than or equal to a preset condensing temperature and the holding time is greater than a second preset time length, the air-conditioning compressor is turned off, and after a third preset time length after the air-conditioning compressor is turned off, the temperature of the air-conditioning condenser is obtained every third preset time length until the temperature of the air-conditioning condenser is within the first preset temperature range value, and the air-conditioning compressor is turned on; when the fuel cell is in the non-working state, if an air-conditioning start signal is received, the air-conditioning compressor is turned on, the working state of the air-conditioning compressor is adjusted according to a preset power and a preset speed, and the external environment temperature, the internal temperature of the vehicle and the target air-conditioning temperature are obtained to adjust the real-time power and real-time speed of the air-conditioning compressor.

[0009] Preferably, the first preset time length is 30 seconds, the second preset time length is 10 seconds, and the third preset time length is 1 minute.

[0010] Preferably, the first preset temperature range is 2-3°C, and the preset condensation temperature is 0°C.

[0011] Preferably, the preset compressor mode is to reduce the speed of the air-conditioning compressor to 1000 rpm and the power to 30% of the rated power.

[0012] Preferably, when the air-conditioning compressor is turned off, the air-conditioning compressor is switched to an internal circulation state.

[0013] Preferably, the thermal management method for a fuel-electric vehicle also includes: obtaining the working state of the fuel cell and the water outlet temperature of the fuel cell; if the fuel cell is in the working state, and the water outlet temperature of the fuel cell exceeds the preset water outlet temperature, and the duration of the water outlet temperature of the fuel cell exceeding the preset water outlet temperature is greater than a fourth preset time length, then controlling the fan to operate in full-power mode; when the fan operates in full-power mode for a fifth preset time length, if the water outlet temperature of the fuel cell still exceeds the preset water outlet temperature, adjusting the power of the fuel cell according to the preset fuel-electric adjustment mode until the water outlet temperature of the fuel cell maintains the preset water outlet temperature; if the water outlet temperature of the fuel cell maintains the preset water outlet temperature, controlling the fan to operate in the current mode; if the water outlet temperature of the fuel cell is lower than the preset water outlet temperature, adjusting the speed of the fan according to the fan adjustment mode until the water outlet temperature of the fuel cell maintains the preset water outlet temperature.

[0014] Preferably, the preset water outlet temperature is 80° C., the fourth preset time length is 1 min, and the fifth preset time length is 1 min.

[0015] Preferably, the preset fuel-electricity adjustment mode is to reduce the rated power by 10% every 0.5 s.

[0016] Preferably, when the fan runs at full power for the fifth preset period of time, the outlet water temperature of the fuel cell is maintained at the preset outlet water temperature, but the inlet water temperature of the fuel cell is lower than the preset inlet water temperature, the speed of the water pump inside the fuel cell is adjusted by reducing the rated speed by 2% every 10 seconds until the inlet water temperature of the fuel cell maintains the preset inlet water temperature.

[0017] Preferably, the preset water inlet temperature is 70°.

[0018] The thermal management method for fuel-electric vehicles provided by the present invention avoids unnecessary energy consumption and improves energy utilization efficiency by intelligently monitoring and adjusting the operating status of the air-conditioning compressor. When the fuel cell is running at full power, the start and stop and mode switching of the air-conditioning compressor are precisely controlled to reduce the additional demand for fuel cell power, thereby helping to maintain the overall performance of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 It is a flow chart of a thermal management method for a fuel-electric vehicle provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" or "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0022] For ease of understanding, the specific process of the embodiment of the present invention is described below. Figure 1In an embodiment of the present invention, a thermal management method for a fuel-electric vehicle includes:

[0023] S101, obtaining the working status of the fuel cell;

[0024] S102, when the fuel cell is in a working state, and the operating state of the fuel cell is full-power operation, if an air-conditioning start signal is received, the temperature of the air-conditioning condenser is obtained, if the temperature of the air-conditioning condenser is maintained within a first preset temperature range value, and the holding time is greater than the first preset time length, the air-conditioning compressor is adjusted according to a preset compressor mode, and after adjusting the air-conditioning compressor, the temperature of the air-conditioning condenser continues to be obtained, if the temperature of the air-conditioning condenser is lower than or equal to the preset condensing temperature, and the holding time is greater than the second preset time length, the air-conditioning compressor is turned off, and after a third preset time length after the air-conditioning compressor is turned off, the temperature of the air-conditioning condenser is obtained every third preset time length until the temperature of the air-conditioning condenser is within the first preset temperature range value, and then the air-conditioning compressor is turned on;

[0025] S103. When the fuel cell is in a non-working state, if an air-conditioning start signal is received, the air-conditioning compressor is turned on, and the working state of the air-conditioning compressor is adjusted according to a preset power and a preset speed, and the outdoor ambient temperature, the indoor temperature and the target air-conditioning temperature are obtained to adjust the real-time power and real-time speed of the air-conditioning compressor.

[0026] It is understandable that the first preset time, the second preset time and the third preset time can be set according to actual needs. In this embodiment, the first preset time is 30s, the second preset time is 10s, and the third preset time is 1min. The control parameters are used for the best effect.

[0027] It is understandable that the first preset temperature range and the preset condensing temperature can be set according to actual needs. In this embodiment, the first preset temperature range is 2-3°C, and the preset condensing temperature is 0°C. Using this control parameter has the best effect.

[0028] It is understandable that the preset compressor mode can be set according to actual needs. In this embodiment, the preset compressor mode is to reduce the speed of the air-conditioning compressor to 1000rpm / min and the power to 30% of the rated power. Using this adjustment mode has the best effect.

[0029] In this embodiment, the maximum power of the air-conditioning compressor is 2.51kw, and the maximum speed is 6000rpm.

[0030] In this embodiment, the temperature of the air conditioner condenser is obtained by a temperature sensor disposed on the air conditioner condenser.

[0031] In this embodiment, when the fuel cell is in a non-working state, if an air-conditioning start signal is received, the air-conditioning compressor is turned on and controlled according to a preset power and a preset speed. The vehicle ambient temperature, the vehicle interior temperature and the target air-conditioning temperature are obtained to adjust the real-time power and real-time speed of the air-conditioning compressor.

[0032] Specifically, assume that the preset power of the air-conditioning compressor is 2.0kW, the preset speed of the air-conditioning compressor is 1800RPM, and the current ambient temperature outside the vehicle is 35°C. The initial in-vehicle temperature is 28°C, and the target air-conditioning temperature set by the user is 22°C. When the air-conditioning compressor starts, it will first run at the preset power (2.0kW) and speed (1800RPM). At this time, the system begins to rapidly reduce the temperature inside the vehicle. As the temperature inside the vehicle gradually decreases, the control system will continuously monitor the difference between the temperature inside the vehicle and the target temperature. When the difference is large, the real-time power and speed of the compressor will remain at a high level to speed up the cooling speed. As the difference decreases, in order to save energy and reduce noise, the control system will gradually reduce the real-time power and speed of the compressor. When the temperature inside the vehicle approaches and stabilizes at the target temperature (22°C), the real-time power and speed of the air-conditioning compressor will reach a new balance point, for example, the real-time power of the compressor is reduced to 1.5kW and the speed is reduced to 1600RPM.

[0033] In this embodiment, unnecessary energy consumption is avoided and energy utilization efficiency is improved by intelligently monitoring and adjusting the operating status of the air-conditioning compressor. When the fuel cell is running at full power, the start and stop and mode switching of the air-conditioning compressor are precisely controlled to reduce the additional demand for fuel cell power, which helps to maintain the overall performance of the vehicle.

[0034] In this embodiment, the thermal management method for a fuel-electric vehicle further includes:

[0035] Obtain the working status of the fuel cell and the water temperature of the fuel cell;

[0036] If the fuel cell is in working state, and the outlet water temperature of the fuel cell exceeds the preset outlet water temperature, and the duration of the outlet water temperature of the fuel cell exceeding the preset outlet water temperature is greater than a fourth preset time length, the fan is controlled to operate in full power mode;

[0037] After the fan has been running at full power for the fifth preset period of time, if the outlet water temperature of the fuel cell still exceeds the preset outlet water temperature, the power of the fuel cell is adjusted according to the preset fuel-electricity adjustment mode until the outlet water temperature of the fuel cell maintains the preset outlet water temperature; if the outlet water temperature of the fuel cell maintains the preset outlet water temperature, the fan operation is controlled according to the current mode; if the outlet water temperature of the fuel cell is lower than the preset outlet water temperature, the fan speed is adjusted according to the fan adjustment mode until the outlet water temperature of the fuel cell maintains the preset outlet water temperature.

[0038] It is understandable that the preset water outlet temperature, the fourth preset time and the fifth preset time can be set according to actual needs. In this embodiment, the preset water outlet temperature is 80°C, the fourth preset time is 1 minute, and the fifth preset time is 1 minute. The control effect of using this control parameter is the best.

[0039] Furthermore, when the fan runs at full power for the fifth preset period of time, the outlet water temperature of the fuel cell is maintained at the preset outlet water temperature, but the inlet water temperature of the fuel cell is lower than the preset inlet water temperature, the speed of the water pump inside the fuel cell is adjusted by reducing the rated speed by 2% every 10 seconds until the inlet water temperature of the fuel cell maintains the preset inlet water temperature.

[0040] It is understandable that the preset water inlet temperature can be set according to actual needs. In this embodiment, the preset water inlet temperature is 70°, and the control effect of using this control parameter is the best.

[0041] It is understandable that the preset fuel-electricity adjustment mode can be set according to actual needs. In this embodiment, the fuel-electricity adjustment mode is to reduce the rated power by 10% every 0.5s. Using this adjustment mode, the effect is best.

[0042] In this embodiment, by monitoring the outlet water temperature of the fuel cell in real time and comparing it with the preset outlet water temperature, the system can quickly identify whether the fuel cell is at risk of overheating, which helps to keep the fuel cell operating within the optimal operating temperature range, thereby improving its efficiency and durability. When it is detected that the outlet water temperature of the fuel cell exceeds the preset value, the system immediately controls the fan to operate in full power mode to speed up the heat dissipation, which helps prevent the fuel cell from being damaged due to long-term high-temperature operation. If the outlet water temperature of the fuel cell still cannot be reduced to the preset value after the fan has been running at full power for a period of time, the system will adjust the power of the fuel cell according to the fuel-electricity adjustment mode. This flexible power adjustment strategy helps to maximize the performance of the fuel cell while ensuring the safe operation of the fuel cell.

[0043] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A thermal management method for a fuel-electric vehicle, characterized in that: include: Obtain the working status of the fuel cell; When the fuel cell is in a working state, and the operating state of the fuel cell is full-power operation, if an air-conditioning start signal is received, the temperature of the air-conditioning condenser is obtained, if the temperature of the air-conditioning condenser is maintained within a first preset temperature range value, and the holding time is greater than the first preset time length, the air-conditioning compressor is adjusted according to the preset compressor mode, and after adjusting the air-conditioning compressor, the temperature of the air-conditioning condenser continues to be obtained, if the temperature of the air-conditioning condenser is lower than or equal to the preset condensing temperature, and the holding time is greater than the second preset time length, the air-conditioning compressor is turned off, and after a third preset time length after the air-conditioning compressor is turned off, the temperature of the air-conditioning condenser is obtained every third preset time length until the temperature of the air-conditioning condenser is within the first preset temperature range value, and then the air-conditioning compressor is turned on; When the fuel cell is in a non-working state, if an air-conditioning start signal is received, the air-conditioning compressor is turned on, and the working state of the air-conditioning compressor is adjusted according to the preset power and preset speed, and the outdoor ambient temperature, the indoor temperature and the target air-conditioning temperature are obtained to adjust the real-time power and real-time speed of the air-conditioning compressor.

2. The thermal management method for a fuel-electric vehicle according to claim 1, characterized in that: The first preset time length is 30 seconds, the second preset time length is 10 seconds, and the third preset time length is 1 minute.

3. The thermal management method for a fuel-electric vehicle according to claim 1, characterized in that: The first preset temperature range value is 2-3°C, and the preset condensation temperature is 0°C.

4. The thermal management method for a fuel-electric vehicle according to claim 1, characterized in that: The preset compressor mode reduces the speed of the air conditioning compressor to 1000 rpm and the power to 30% of the rated power.

5. The thermal management method for a fuel-electric vehicle according to claim 1, characterized in that: When the air conditioning compressor is turned off, it switches to the internal circulation state.

6. The thermal management method for a fuel-electric vehicle according to claim 1, characterized in that: Also includes: Obtaining the working state of the fuel cell and the outlet water temperature of the fuel cell; If the fuel cell is in working state, and the outlet water temperature of the fuel cell exceeds the preset outlet water temperature, and the duration of the outlet water temperature of the fuel cell exceeding the preset outlet water temperature is greater than a fourth preset time length, the fan is controlled to operate in full power mode; After the fan has been running at full power for the fifth preset period of time, if the outlet water temperature of the fuel cell still exceeds the preset outlet water temperature, the power of the fuel cell is adjusted according to the preset fuel-electricity adjustment mode until the outlet water temperature of the fuel cell maintains the preset outlet water temperature; if the outlet water temperature of the fuel cell maintains the preset outlet water temperature, the fan operation is controlled according to the current mode; if the outlet water temperature of the fuel cell is lower than the preset outlet water temperature, the fan speed is adjusted according to the fan adjustment mode until the outlet water temperature of the fuel cell maintains the preset outlet water temperature.

7. The fuel-electric vehicle thermal management method according to claim 6, characterized in that: The preset water outlet temperature is 80°C, the fourth preset time is 1 minute, and the fifth preset time is 1 minute.

8. The fuel-electric vehicle thermal management method according to claim 1, characterized in that: The preset fuel-electricity adjustment mode is to reduce the rated power by 10% every 0.5s.

9. The fuel-electric vehicle thermal management method according to claim 6, characterized in that: When the fan runs at full power for the fifth preset time, the outlet water temperature of the fuel cell is maintained at the preset outlet water temperature, but the inlet water temperature of the fuel cell is lower than the preset inlet water temperature, the speed of the water pump inside the fuel cell is adjusted by reducing the rated speed by 2% every 10 seconds until the inlet water temperature of the fuel cell maintains the preset inlet water temperature.

10. The thermal management method for a fuel-electric vehicle according to claim 1, characterized in that: The default water inlet temperature is 70°.

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