New energy vehicle condensation fan control method and device, storage medium and equipment

Abstract

The invention relates to a new energy vehicle condensation fan control method and device, a storage medium and equipment. The method comprises the steps that the type of the whole vehicle thermal management operation condition is determined; determining at least one applicable control strategy for each condensation fan according to the type of the thermal management operation condition of the whole vehicle; for the same condensation fan, at least one rotating speed request value is generated through one or more independent control strategies; when the same condensation fan has a plurality of rotating speed request values, determining a final rotating speed request value from the plurality of rotating speed request values according to a preset selection rule; and controlling the rotating speed of the corresponding condensation fan according to the final rotating speed request value.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile cooling system control, and in particular to a method, device, storage medium and equipment for controlling a condensing fan of a new energy vehicle. Background Art

[0002] In new energy commercial vehicles, the condenser fan is a key component of the vehicle's thermal management system, and its speed control directly affects cooling efficiency and energy consumption. Currently, condenser fan speed control in new energy commercial vehicles primarily relies on pressure switches and actual water temperature to uniformly control multiple fans. Specifically, when the pressure exceeds a certain set point, the fan automatically turns on; when the pressure falls below a certain set point, the fan automatically stops.

[0003] However, this simple on-off control method has significant shortcomings. First, existing technologies cannot accurately and dynamically adjust fan speed in real time, making it difficult to maintain the condensing pressure near the target value over a long period of time, thus affecting the vehicle's cooling efficiency. For example, when the system needs to reduce the condensing pressure, the fan often runs at maximum speed. However, once the pressure drops below the set value, the fan stops completely, resulting in periodic fluctuations and making it impossible to achieve stable pressure control.

[0004] Secondly, existing technologies use the same control strategy for multiple fans in a thermal management system, ignoring the differentiated cooling requirements of the system under different operating conditions. Under certain operating conditions, the operation of some fans may be unnecessary, but due to the limitations of the control strategy, all fans will still run simultaneously, significantly increasing the vehicle's energy consumption and causing unnecessary energy waste. Furthermore, the thermal management system of new energy commercial vehicles needs to cope with a variety of complex operating conditions. Existing simple control strategies are difficult to fine-tune based on the characteristics of different operating conditions, and cannot achieve optimal system efficiency.

[0005] Therefore, there is an urgent need for a method that can accurately control the fan according to the thermal management operating conditions of the entire vehicle, which can not only improve the thermal management efficiency, but also reduce the fan energy consumption by graded control of different fans, thereby improving the economy of the entire vehicle. Summary of the Invention

[0006] The present invention discloses a method, device, storage medium and equipment for controlling a condensing fan of a new energy vehicle, aiming to solve the technical problems existing in the prior art.

[0007] The present invention adopts the following technical solutions:

[0008] In a first aspect, an embodiment of the present invention provides a method for controlling a condenser fan of a new energy vehicle, the method comprising:

[0009] Determine the type of vehicle thermal management operating conditions;

[0010] Determine at least one applicable control strategy for each condenser fan based on the type of vehicle thermal management operating condition;

[0011] For the same condensing fan, at least one speed request value is generated through one or more independent control strategies;

[0012] When there are multiple speed request values ​​for the same condensing fan, a final speed request value is determined from the multiple speed request values ​​according to a preset selection rule;

[0013] The speed of the corresponding condensing fan is controlled according to the final speed request value.

[0014] As a preferred technical solution, the step of determining the type of vehicle thermal management operating condition includes:

[0015] The type of thermal management operating condition of the vehicle is determined based on the combined relationship between the vehicle's current drive component cooling demand state, passenger compartment temperature regulation demand state, and power battery temperature regulation demand state.

[0016] As a preferred technical solution, the types of vehicle thermal management operating conditions include:

[0017] Passenger compartment temperature adjustment operating conditions, drive component cooling operating conditions, power battery temperature adjustment operating conditions, and combinations of the above operating conditions;

[0018] Among them, the passenger compartment temperature adjustment conditions include cooling conditions and heating conditions, and the heating conditions include electric heating conditions and heat pump heating conditions.

[0019] As a preferred technical solution, the step of determining at least one applicable control strategy for each condenser fan according to the type of vehicle thermal management operating condition includes:

[0020] Under at least the driving component cooling condition, the same speed control strategy is adopted for all condensing fans;

[0021] Under at least the passenger compartment cooling condition or the power battery cooling condition, the condenser fan speed control strategy is determined based on the ambient temperature and the compressor exhaust pressure, and the same speed control strategy is adopted for all condenser fans;

[0022] Under the combined operating conditions of heat pump heating and power battery cooling, a hierarchical control strategy is adopted for the condenser fan based on the difference between the drive component inlet water temperature and the target water temperature;

[0023] Under the combined operating conditions of electric heating and drive component cooling, a hierarchical control strategy is adopted for the condensing fan according to the difference between the drive component inlet water temperature and the target air outlet temperature;

[0024] In at least a heat pump heating condition, a speed control strategy for at least one condensing fan is determined according to a difference between a compressor exhaust pressure and a target exhaust pressure.

[0025] As a preferred technical solution, in the step of adopting the same speed control strategy for all condensing fans under at least the driving component cooling condition, the steps include:

[0026] Obtain the drive component inlet water temperature, drive component temperature, and drive component controller temperature;

[0027] Determine the corresponding condensing fan speed request value according to the drive component inlet water temperature, the drive component temperature and the drive component controller temperature;

[0028] The maximum value is selected from the corresponding speed request values ​​as the speed request value of all condensing fans.

[0029] As a preferred technical solution, the hierarchical control strategy includes:

[0030] First, the rotation speed of the first condensing fan is adjusted;

[0031] When the speed of the first condensing fan reaches a preset threshold, the speed of the second condensing fan begins to be adjusted;

[0032] When the speed of the second condensing fan reaches a preset threshold, the speed of the third condensing fan begins to be adjusted;

[0033] Among them, there are preset deviations in the control reference values ​​of different condensing fans.

[0034] As a preferred technical solution, a proportional-integral control algorithm is used to adjust the condenser fan speed. The proportional-integral control algorithm includes:

[0035] Calculating a speed adjustment amount based on a difference between a control parameter and a target parameter;

[0036] Perform adjustment operations according to the preset control cycle;

[0037] According to the control requirements of different working conditions, select the corresponding control parameters and target parameters for proportional-integral adjustment.

[0038] As a preferred technical solution, in at least the heat pump heating condition, the step of determining the speed control strategy of at least one condensing fan according to the difference between the compressor exhaust pressure and the target exhaust pressure includes:

[0039] Determine the target exhaust pressure of the compressor according to the target outlet air temperature;

[0040] According to the difference between the actual exhaust pressure of the compressor and the target exhaust pressure, the speed of the first condensing fan is adjusted through a proportional-integral control algorithm;

[0041] Among them, the control period of the proportional-integral control algorithm is dynamically adjusted according to the ambient temperature, and the ambient temperature is negatively correlated with the control period.

[0042] As a preferred technical solution, the preset selection rules include:

[0043] Compare and analyze multiple speed request values;

[0044] The maximum value thereof is determined as the final speed request value;

[0045] The final speed request value is limited so that it is between the preset upper and lower speed limits.

[0046] In a second aspect, an embodiment of the present invention provides a condenser fan control device for a new energy vehicle, comprising:

[0047] The operating condition determination module is used to determine the type of vehicle thermal management operating condition;

[0048] A strategy determination module, configured to determine at least one applicable control strategy for each condenser fan based on the type of thermal management operating condition of the vehicle;

[0049] A speed determination module is configured to generate at least one speed request value for the same condenser fan using one or more independent control strategies; and is further configured to determine a final speed request value from among the multiple speed request values ​​according to a preset selection rule when multiple speed request values ​​exist for the same condenser fan.

[0050] The execution control module is used to control the speed of the corresponding condensing fan according to the final speed request value.

[0051] In a third aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the storage medium stores at least one instruction, and the at least one instruction is loaded by a processor and executed to implement the new energy vehicle condensing fan control method as described in any one of the above items.

[0052] In a fourth aspect, an embodiment of the present invention provides an electronic device, comprising a processor and a memory, wherein the memory stores at least one instruction, and the instruction is loaded and executed by the processor to implement the new energy vehicle condensing fan control method as described in any one of the above items.

[0053] One embodiment of the above invention has the following advantages or beneficial effects:

[0054] The condenser fan control method and device for new energy vehicles provided by the present invention achieve highly targeted and precise control by determining the operating condition type based on the operating status of the vehicle's thermal management system and selecting an appropriate control strategy for each condenser fan. This solution preferably adopts a hierarchical control mechanism, which avoids the energy waste caused by the condenser fan running at full speed while meeting the system's heat dissipation requirements, effectively reducing the energy consumption of the entire vehicle. In the case of multiple speed request values ​​for the same condenser fan, the present invention adopts a more scientific and reasonable selection rule to handle it, ensuring that the fan speed can meet the maximum heat dissipation demand without exceeding the necessary range.

[0055] Overall, this solution enables multiple condensing fans to work together through differentiated control strategies and a hierarchical adjustment mechanism, significantly optimizing energy utilization efficiency while ensuring the performance of the thermal management system, and providing an innovative energy-saving technology solution for the thermal management system of new energy vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments, which constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0057] Figure 1 A flowchart of a method for controlling a condensing fan of a new energy vehicle according to an embodiment of the present invention;

[0058] Figure 2 This is a structural diagram of a condenser fan control device for a new energy vehicle provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0059] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. In the description of the present invention, it should be noted that the term "or" is generally used in the sense of including "and / or" unless the content clearly indicates otherwise.

[0060] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0061] To address the deficiencies in the prior art, an embodiment of the present invention provides a method for controlling condensing fans in new energy vehicles. This method can perform hierarchical control of multiple condensing fans according to the actual operating conditions of the vehicle's thermal management, thereby reducing the energy consumption of the vehicle.

[0062] In a preferred embodiment, the control method is applicable to new energy vehicles equipped with three condensing fans, in particular to new energy commercial vehicles, such as new energy heavy trucks; specifically, new energy commercial vehicles have high power, heavy heat load and complex systems, and the thermal management system needs to cope with a variety of complex working conditions, so multiple condensing fans are configured to meet their heat dissipation needs. In this embodiment, the number of condensing fans is determined based on the air demand calculated based on parameters such as the heat dissipation required by the preset new energy commercial vehicle, the condensation temperature difference of the compressor, the specific heat capacity of the air, and the air density. After precise calculation and system optimization design, the three condensing fans are installed behind the radiator of the vehicle, and each is independently controlled in stages to achieve the best heat dissipation effect and energy utilization efficiency. Preferably, in this embodiment, the three condensing fans are defined as the first condensing fan, the second condensing fan, and the third condensing fan.

[0063] Preferably, according to the heat dissipation requirements of different operating conditions of the vehicle thermal management system, the control method can control the three condensing fans individually or collaboratively, so as to achieve reasonable distribution and management of heat among different systems and effectively reduce the energy consumption of the vehicle.

[0064] refer to Figure 1 In a preferred embodiment, the condensing fan control method for a new energy vehicle includes at least steps S110 to S150.

[0065] Step S110: Determine the type of vehicle thermal management operating condition.

[0066] In a preferred embodiment, the type of vehicle thermal management operating condition is determined based on a combination of the vehicle's current drive component cooling requirement state, passenger compartment temperature regulation requirement state, and power battery temperature regulation requirement state.

[0067] Specifically, the vehicle's thermal management operating condition is determined by acquiring and analyzing the operating status parameters of each vehicle system. The control system collects key parameters such as drive component temperature, passenger compartment interior and exterior temperatures, electric heating or heat pump system status, and power battery temperature in real time. It then comprehensively determines the current vehicle thermal management operating condition based on user-defined air conditioning requirements and vehicle operating status. For example, if the drive motor temperature exceeds a preset threshold, the system identifies the condition as drive component cooling. If the passenger compartment temperature deviates from the target temperature and the user activates the air conditioning system, electric heating, or heat pump system, the system identifies the condition as cabin temperature regulation. If the power battery temperature exceeds the optimal operating temperature range, the system identifies the condition as battery temperature regulation.

[0068] In a preferred embodiment, the types of vehicle thermal management operating conditions include: passenger compartment temperature adjustment conditions, drive component cooling conditions, power battery temperature adjustment conditions, and combined conditions of the above conditions; among them, the passenger compartment temperature adjustment conditions include cooling conditions and heating conditions, and the heating conditions include electric heating conditions and heat pump heating conditions.

[0069] Specifically, electric heating relies primarily on PTC heaters to convert electricity directly into heat, making it suitable for low ambient temperatures or when rapid heating is required. However, this method results in relatively low energy conversion efficiency and high power consumption, significantly impacting vehicle range, particularly in cold environments, where power consumption can increase significantly. Heat pump heating, on the other hand, utilizes a heat pump system to absorb heat from the environment or other vehicle components and transfer it to the passenger compartment. This method offers higher energy efficiency and minimizes range loss, but also results in a relatively slow start-up and warming. By distinguishing between these two heating modes, the control system can select the most appropriate heating method based on external temperature conditions, vehicle status, and energy consumption requirements, and adjust the condenser fan control strategy accordingly, minimizing vehicle energy consumption while ensuring passenger compartment comfort.

[0070] Step S120 : determining at least one applicable control strategy for each condensing fan according to the type of the vehicle thermal management operating condition.

[0071] In a preferred embodiment, the vehicle thermal management operating conditions are at least of the following types:

[0072] At least the driving component cooling condition; at least the heat pump heating condition; at least the passenger compartment cooling condition or the power battery cooling condition; the combined condition of heat pump heating and power battery cooling; the combined condition of electric heating and driving component cooling.

[0073] Preferably, the same speed control strategy is adopted for all condensing fans under at least the driving component cooling condition. Specifically, the driving components (i.e., motors) of new energy commercial vehicles will generate a lot of heat when running at high load, and a special cooling strategy is required to ensure the safe and stable operation of the system to avoid degradation of the driving system performance or protective power reduction due to overheating. The same speed control strategy is adopted for all condensing fans under this type of working condition because the heat dissipation demand is relatively simple and urgent at this time, and all condensing fans need to work together to provide maximum heat dissipation capacity to ensure that the temperature of the driving system drops rapidly to a safe range. This strategy can improve heat dissipation efficiency while simplifying the control logic.

[0074] Preferably, at least the drive component cooling operating condition specifically includes: drive component cooling only operating condition, combined operating condition of drive component cooling and power battery cooling, combined operating condition of drive component cooling and passenger compartment cooling, and combined operating condition of drive component cooling, power battery cooling and passenger compartment cooling.

[0075] Preferably, in at least the passenger compartment cooling or power battery cooling conditions, the condenser fan speed control strategy is determined based on ambient temperature and compressor discharge pressure, and the same speed control strategy is applied to all condenser fans. Specifically, in both operating conditions, efficient operation of the refrigeration system is required. Ambient temperature directly affects condensation efficiency, while compressor discharge pressure reflects the current system load. Therefore, determining fan speed based on these two key parameters enables precise control of condensation temperature, ensuring that the refrigeration system operates at its optimal operating point. Applying the same speed strategy to multiple condenser fans is intended to maintain pressure balance across the entire condensing system, thereby improving system efficiency.

[0076] Preferably, at least the passenger compartment cooling condition or the power battery cooling condition specifically includes: the power battery cooling condition only, the passenger compartment cooling condition only, the combined condition of power battery cooling and passenger compartment cooling, the combined condition of power battery cooling and drive component cooling, the combined condition of passenger compartment cooling and drive component cooling, the combined condition of drive component cooling, power battery cooling and passenger compartment cooling, the combined condition of power battery cooling and electric heating, and the combined condition of power battery cooling, drive component cooling and electric heating.

[0077] Preferably, under the combined operating conditions of heat pump heating and power battery cooling, a hierarchical control strategy is adopted for the condenser fans based on the difference between the drive unit inlet water temperature and the target water temperature. Specifically, under this combined operating condition, there are dual demands for heat absorption by the heat pump system and heat dissipation by the power battery, and these demands may compete with each other. The hierarchical control strategy can balance the energy demands of these two systems based on the difference between the drive unit inlet water temperature and the target water temperature, rationally allocating condenser fan resources, ensuring the heat exchange efficiency of the heat pump system while meeting the temperature control requirements of the power battery, and achieving optimal overall system energy efficiency.

[0078] Preferably, the combined operating condition of heat pump heating and power battery cooling further includes a combined operating condition of heat pump heating, drive component cooling and power battery cooling.

[0079] Preferably, in the combined operating conditions of electric heating and drive component cooling, a hierarchical control strategy is employed for the condenser fan based on the difference between the drive component inlet water temperature and the target outlet air temperature. Specifically, in this combined operating condition, the conflicting demands of passenger compartment electric heating and drive component cooling must be met simultaneously. By monitoring the difference between the drive component inlet water temperature and the target outlet air temperature and employing a hierarchical control strategy, dynamic allocation of condenser fan resources can be achieved, minimizing the impact on electric heating while ensuring that the drive component does not overheat, thereby optimizing vehicle energy efficiency.

[0080] Preferably, the combined operating condition of electric heating and driving component cooling further includes a combined operating condition of electric heating, power battery cooling and driving component cooling.

[0081] Preferably, in at least the heat pump heating mode, the speed control strategy for at least one condenser fan is determined based on the difference between the compressor discharge pressure and the target discharge pressure. In this mode, the compressor discharge pressure directly affects the system's heat exchange capacity and energy efficiency. By monitoring the difference between the compressor discharge pressure and the target discharge pressure to control the condenser fan speed, the heat pump system can be maintained in optimal operating condition, ensuring sufficient heating capacity while avoiding compressor high-pressure protection or energy efficiency degradation. This allows the heat pump system to operate efficiently under various environmental conditions and reduces vehicle energy consumption.

[0082] Preferably, at least the heat pump heating operating condition specifically includes: heat pump heating only operating condition, combined operating condition of heat pump heating and power battery cooling, combined operating condition of heat pump heating and drive component cooling, and combined operating condition of heat pump heating, drive component cooling and power battery cooling.

[0083] In a preferred embodiment, the vehicle thermal management operating condition further includes an electric heating only operating condition, in which all condensing fans are preferably controlled to remain in an off state.

[0084] Specifically, in electric-only heating mode, the vehicle's thermal management system primarily relies on the PTC heater to heat the passenger compartment. During this time, the drive components are typically under low load or stationary, generating minimal heat and requiring no dedicated cooling. Simultaneously, the thermal management system directs all coolant to the PTC heater to improve heating efficiency, preventing it from flowing through the radiator and eliminating the need for radiator heat dissipation. In this operating mode, keeping the condenser fan off not only avoids unnecessary energy consumption but also prevents cold air from being drawn into the front-end module, reducing the effectiveness of the electric heating system. This improves vehicle energy efficiency and extends range.

[0085] Step S130 : For the same condensing fan, at least one speed request value is generated by using one or more independent control strategies.

[0086] Preferably, under at least the driving component cooling condition, the control strategy specifically includes: obtaining the driving component inlet water temperature, the driving component temperature and the driving component controller temperature; determining the corresponding condensing fan speed request values ​​according to the driving component inlet water temperature, the driving component temperature and the driving component controller temperature; selecting the maximum value from the corresponding speed request values ​​as the speed request value of all condensing fans.

[0087] Specifically, when determining the corresponding rotational speed request value of the condensing fan, it is achieved through three preset temperature-rotational speed mapping relationship tables respectively.

[0088] In a preferred embodiment, for the drive unit inlet water temperature, when the temperature is below 45°C, the corresponding fan PWM request value is 15%; when the temperature reaches or exceeds 65°C, the corresponding fan PWM request value is 90%; and when the temperature is between 45°C and 65°C, the fan PWM request value is calculated by linear interpolation based on the temperature change. Similarly, for the drive unit temperature, when the temperature is below 100°C, the corresponding fan PWM request value is 15%; when the temperature reaches or exceeds 150°C, the corresponding fan PWM request value is 90%; and when the temperature is between 100°C and 150°C, the fan PWM request value is determined by linear interpolation. For the drive unit controller temperature, when the temperature is below 60°C, the corresponding fan PWM request value is 15%; when the temperature reaches or exceeds 85°C, the corresponding fan PWM request value is 90%; and when the temperature is between 60°C and 85°C, the fan PWM request value is also determined by linear interpolation.

[0089] Furthermore, the safe operation of the drive system depends on temperature control of its components. Overheating of any critical component can lead to performance degradation or safety risks for the entire system. By selecting the maximum speed request value when selecting the requested value, the system can prioritize components with the highest temperatures and most urgent cooling needs, ensuring that the entire drive system operates within a safe temperature range. This control method also simplifies the coordinated control logic of multiple fans, improving the reliability and responsiveness of the control system. It is particularly suitable for operating conditions where safety is a high priority, such as cooling drive components.

[0090] Preferably, under at least the passenger compartment cooling condition or the power battery cooling condition, the control strategy is implemented by a preset ambient temperature-compressor exhaust pressure-fan speed mapping table.

[0091] In a preferred embodiment, when the ambient temperature is 20°C and the compressor discharge pressure is 10 bar, the corresponding fan PWM request value is 25%; when the ambient temperature rises to 30°C and the compressor discharge pressure increases to 15 bar, the fan PWM request value increases to 75%; when the ambient temperature reaches 40°C and the compressor discharge pressure reaches 19 bar or above, the fan PWM request value will reach 85% or 90%. This two-dimensional mapping table design fully considers the impact of ambient temperature on condensing efficiency and the actual system load state, and can accurately adjust the fan speed according to different operating conditions to ensure efficient operation of the refrigeration system.

[0092] Specifically, under cooling conditions, the condenser as a whole must maintain uniform heat exchange to maintain pressure balance and stable operation of the refrigeration system. By uniformly controlling the speed of all fans, the condenser surface temperature can be evenly distributed, avoiding localized overcooling or overheating, and improving the overall heat exchange efficiency and stability of the system.

[0093] Preferably, under the combined operating conditions of heat pump heating and power battery cooling, a hierarchical control strategy is adopted for the condensing fan, and the hierarchical control strategy includes: first adjusting the speed of the first condensing fan; when the speed of the first condensing fan reaches a preset threshold, starting to adjust the speed of the second condensing fan; when the speed of the second condensing fan reaches a preset threshold, starting to adjust the speed of the third condensing fan; wherein, there is a preset deviation in the control reference values ​​of different condensing fans.

[0094] Specifically, the control strategy first determines the target water temperature reference values ​​of different condensing fans based on a preset mapping table. For example, the target water temperatures of the first condensing fan, the second condensing fan, and the third condensing fan are set to 50°C, 55°C, and 60°C, respectively. In the actual control process, the system enables a graded start-up strategy, and starts the fans step by step according to the difference between the water temperature at the inlet of the driving component and the target water temperature corresponding to each condensing fan. For example, the speed of the first condensing fan is first adjusted by PI (proportional integral control algorithm) according to the difference between the water temperature at the inlet of the driving component and the target water temperature of 50°C; when the speed of the first condensing fan exceeds the preset threshold of 60%, the system starts to adjust the speed of the second condensing fan by PI according to the difference between the water temperature at the inlet of the driving component and the target water temperature of 55°C; when the speed of the second condensing fan also exceeds 60%, the system adjusts the speed of the third condensing fan by PI according to the difference between the water temperature at the inlet of the driving component and the target water temperature of 60°C. Finally, the PWM values ​​of the three condensing fans are obtained respectively.

[0095] By adopting a hierarchical control strategy, the system can flexibly adjust fan resources based on actual cooling needs. Under light load conditions, only some condenser fans are activated, and as the load increases, the number and speed of condenser fans are gradually increased. This not only meets the system's cooling needs but also avoids unnecessary energy consumption. Furthermore, the target water temperatures for different condenser fans are set to incremental values, ensuring a smooth system response and avoiding control fluctuations and increased energy consumption caused by frequent condenser fan starts and stops.

[0096] In a preferred embodiment, the PI control algorithm includes: calculating the speed adjustment amount based on the difference between the control parameter and the target parameter; performing the adjustment operation according to the preset control cycle; and selecting the corresponding control parameter and target parameter for proportional-integral adjustment according to the control requirements of different working conditions.

[0097] It should be noted that since the specific parameters of the proportional-integral control algorithm (such as the proportional coefficient, integral time constant, etc.) are closely related to the specific system characteristics and the dynamic response characteristics of the control object, they need to be determined through system calibration and optimization, and different vehicle models and different system configurations may require different parameter settings. Therefore, this embodiment no longer specifies the specific calculation parameters of the PI algorithm.

[0098] Preferably, in the combined operating condition of electric heating and drive component cooling, and when the current ambient temperature exceeds 10° C., a hierarchical control strategy is adopted for the condensing fan.

[0099] In a preferred embodiment, the speed of the first condensing fan is first PI-adjusted according to the difference between the water temperature at the inlet of the driving component and the target air outlet temperature. When the speed of the first condensing fan exceeds 60%, the system starts to PI-adjust the speed of the second condensing fan according to the difference between the water temperature at the inlet of the driving component and the target air outlet temperature plus 5°C. When the speed of the second condensing fan also exceeds 60%, the system then PI-adjusts the speed of the third condensing fan according to the difference between the water temperature at the inlet of the driving component and the target air outlet temperature plus 10°C.

[0100] Specifically, a hierarchical control strategy is employed in this operating condition to ensure that the cooling requirements of the drive components are met without excessively impacting passenger compartment heating. By setting increasing temperature differentials as control references for different fans, the system can activate only some condenser fans when the drive component cooling requirements are low, and gradually increase the number and speed of condenser fans as cooling requirements increase, thus achieving a balance between energy consumption and cooling effectiveness.

[0101] Preferably, under at least the heat pump heating condition, the speed control strategy of at least one condensing fan is determined, specifically including: determining the target exhaust pressure of the compressor according to the target outlet air temperature; adjusting the speed of the first condensing fan through a proportional-integral control algorithm according to the difference between the actual exhaust pressure of the compressor and the target exhaust pressure; wherein the control period of the proportional-integral control algorithm is dynamically adjusted according to the ambient temperature, and the ambient temperature is negatively correlated with the control period.

[0102] In a preferred embodiment, under this working condition, the system first determines the target operating pressure of the compressor based on a preset mapping relationship table between the target outlet air temperature and the compressor target exhaust pressure. For example, when the target outlet air temperature is 45°C, the corresponding compressor target exhaust pressure is 10 bar; when the target outlet air temperature is 65°C, the corresponding compressor target exhaust pressure is 21 bar; when the target outlet air temperature is between 45°C and 65°C, the target exhaust pressure is interpolated according to a linear relationship. The system calculates the speed request value of the first condensing fan through the PI control algorithm based on the difference between the actual exhaust pressure of the compressor and this target exhaust pressure. Under this working condition, only the first condensing fan needs to be running to meet the regulation requirements of the exhaust pressure control.

[0103] Preferably, to adapt to the dynamic response characteristics of the heat pump system under different ambient temperatures, the system dynamically adjusts the PI control period. When the ambient temperature is low, such as at 0°C, the system uses a longer control period, such as 14 seconds, to reduce control frequency and avoid instability caused by frequent system adjustments. As the ambient temperature rises, the system's dynamic response speed increases, and the control period shortens accordingly. For example, at an ambient temperature of 15°C, the control period is reduced to 5 seconds. This design, in which ambient temperature and control period are negatively correlated, allows the control strategy to be adaptively adjusted based on the system's response characteristics under different environmental conditions, ensuring both control accuracy and improving system stability.

[0104] Specifically, under these operating conditions, exhaust pressure directly impacts the system's heat exchange efficiency and heat output capacity. By precisely controlling the compressor's exhaust pressure, the system can meet the passenger compartment's heating needs while avoiding excessive compressor load, thereby improving the system's energy efficiency. Furthermore, a dynamic adjustment mechanism for the control cycle adapts to the heat pump system's varying response characteristics under varying ambient temperatures, enhancing the robustness and adaptability of the control strategy and ensuring stable heating results under various environmental conditions.

[0105] Step S140 : When there are multiple speed request values ​​for the same condensing fan, a final speed request value is determined from the multiple speed request values ​​according to a preset selection rule.

[0106] Preferably, the preset selection rules include: comparing and analyzing multiple speed request values; determining the maximum value as the final speed request value; and implementing a limit constraint on the final speed request value so that it is between a preset speed upper limit and a preset speed lower limit.

[0107] Based on steps S120 and S130, it can be seen that under the same operating conditions, each condensing fan may correspond to one or more control strategies, and at this time, each condensing fan will have one or more speed request values. When selecting, the system adopts the principle of selecting the maximum value to determine the final speed request value of the condensing fan. This selection method ensures that while meeting multiple control requirements, the cooling requirements of the components or systems with the highest and most urgent heat dissipation requirements are prioritized. At the same time, this strategy also simplifies the complexity of multi-objective control, improves the response speed and stability of the control system, and by directly selecting the maximum value, avoids the computational burden of complex optimization algorithms, making control decisions more efficient.

[0108] Step S150: controlling the speed of the corresponding condensing fan according to the final speed request value.

[0109] Specifically, after the final control request value of each condensing fan is determined in step S140, it is converted into a corresponding PWM signal or other control signal suitable for the condensing fan driving circuit, and the corresponding control signal is sent to the corresponding condensing fan.

[0110] In a more specific embodiment of the present invention, a specific example of the above steps S110 to S150 is given. In this embodiment, three condensing fans are defined as fan A, fan B, and fan C, respectively.

[0111] First, the type of vehicle thermal management operating condition is determined based on the combined relationship between the vehicle's current drive component cooling requirements, passenger compartment temperature regulation requirements, and power battery temperature regulation requirements. In this embodiment, the vehicle thermal management operating conditions are divided into 16 types, ranging from 0 to 15, as shown in Table 1 below:

[0112] Working condition number Scenario Description 0 Ventilation mode 1 Motor cooling 2 Passenger compartment cooling 3 Battery cooling 4 Passenger compartment cooling + battery cooling 5 Passenger compartment cooling + motor cooling 6 Battery cooling + motor cooling 7 Passenger compartment cooling + battery cooling + motor cooling 8 Passenger compartment heating (PTC heating) 9 Passenger compartment heating (heat pump) 10 Passenger compartment heating (PTC heating) + battery cooling 11 Passenger compartment heating (heat pump) + battery cooling 12 Passenger compartment heating (PTC heating) + motor cooling 13 Passenger compartment heating (heat pump) + motor cooling 14 Passenger compartment heating (PTC heating) + battery cooling + motor cooling 15 Passenger cabin heating (heat pump) + battery cooling + motor cooling

[0113] Table 1

[0114] When the vehicle thermal management operating conditions are 1, 5, 6, or 7, the three fan request values ​​remain consistent under these conditions. When determining the request values, the corresponding mapping tables are first queried based on the motor water inlet temperature, motor temperature, and motor controller temperature to determine the fan speed PWM request value. The specific mapping tables are shown in Tables 2, 3, and 4. Then, the larger of the three request values ​​obtained is the fan speed PWM request value, which is recorded as Fan A request value 1, Fan B request value 1, and Fan C request value 1.

[0115] Motor water inlet temperature / ℃ 45 65 Fan PWM / % 15 90

[0116] Table 2

[0117] Motor temperature / ℃ 100 150 Fan PWM / % 15 90

[0118] Table 3

[0119] Motor controller temperature / ℃ 60 85 Fan PWM / % 15 90

[0120] Table 4

[0121] When the vehicle thermal management operating conditions are 2, 3, 4, 5, 6, 7, 10, or 14, the three fan request values ​​remain consistent. The fan speed PWM request value is determined by querying the mapping table based on the ambient temperature and compressor exhaust pressure. The specific mapping table is shown in Table 5, which is recorded as Fan A request value 2, Fan B request value 2, and Fan C request value 2.

[0122]

[0123] Table 5

[0124] When the vehicle's thermal management operating condition is 11 or 15, the fans are turned on in a step-by-step manner, with target water temperatures determined for each fan. The specific mapping table is shown in Table 6. At this time, PI adjustment is performed on the speed of Fan A based on the difference between the motor inlet water temperature and the target water temperature. When the speed of Fan A exceeds 60%, the speed of Fan B is PI-adjusted based on the difference between the motor inlet water temperature and the target water temperature. When the speed of Fan B exceeds 60%, the speed of Fan C is PI-adjusted based on the difference between the motor inlet water temperature and the target water temperature. The resulting PWM values ​​for each fan are recorded as Fan A Request Value 3, Fan B Request Value 3, and Fan C Request Value 3, respectively.

[0125] Fan number A B C Target water temperature / ℃ 50 55 60

[0126] Table 6

[0127] When the vehicle thermal management operating condition is 12 or 14, under this condition, when the ambient temperature exceeds 10°C, the fan adopts a step-by-step opening strategy, and the speed of fan A is PI-adjusted according to the difference between the motor inlet water temperature and the target outlet air temperature. When the speed of fan A exceeds 60%, the speed of fan B is PI-adjusted according to the difference between the motor inlet water temperature and the target outlet air temperature plus 5°C. When the speed of fan B exceeds 60%, the speed of fan C is PI-adjusted according to the difference between the motor inlet water temperature and the target outlet air temperature plus 10°C. The resulting PWM values ​​of each fan are recorded as fan A request value 4, fan B request value 4, and fan C request value 4, respectively.

[0128] When the vehicle thermal management operating condition is 9, 11, 13, or 15, the compressor target exhaust pressure is determined by querying the mapping table based on the target outlet air temperature. The specific mapping table is shown in Table 7. The fan A speed PWM request value is PI-adjusted based on the difference between the actual compressor exhaust pressure and the target exhaust pressure. The PI adjustment period is determined by querying the mapping table based on the ambient temperature. The specific mapping table is shown in Table 8. The obtained request value is recorded as the fan A request value of 5. In this operating condition, the exhaust pressure control requirement can be met by simply running fan A.

[0129] Target air outlet temperature / ℃ 45 65 Compressor target exhaust pressure / bar 10 21

[0130] Table 7

[0131] Ambient temperature / ℃ 0 5 10 15 PI cycle / s 14 11 8 5

[0132] Table 8

[0133] In working condition 8, the three condensing fans do not need to be started because the motor does not need to be cooled. At this time, all the coolant flows into the PTC heating for cockpit heating and does not flow through the radiator, so there is no need to start the condensing fans.

[0134] Finally, the request value of fan A is the maximum value of fan A request values ​​1, 2, 3, 4, and 5, the request value of fan B is the maximum value of fan B request values ​​1, 2, 3, and 4, and the request value of fan C is the maximum value of fan C request values ​​1, 2, 3, and 4.

[0135] refer to Figure 2 In one embodiment of the present invention, a condenser fan control device 200 for a new energy vehicle is further provided. Preferably, the control device includes an operating condition determination module 210, a strategy determination module 220, a speed determination module 230 and an execution control module 240, wherein the operating condition determination module 210 is used to determine the type of the thermal management operating condition of the entire vehicle; the strategy determination module 220 is used to determine at least one applicable control strategy for each condenser fan according to the type of the thermal management operating condition of the entire vehicle; the speed determination module 230 is used to generate at least one speed request value for the same condenser fan through one or more independent control strategies; the speed determination module 240 is also used to determine a final speed request value from the multiple speed request values ​​according to a preset selection rule when there are multiple speed request values ​​for the same condenser fan; the execution control module is used to control the speed of the corresponding condenser fan according to the final speed request value.

[0136] It should be noted that the new energy vehicle condenser fan control device provided in the embodiment of the present invention and the new energy vehicle condenser fan control method in the above embodiment are derived from the same inventive concept. The specific implementation process recorded in the previous embodiment is naturally inherited in this embodiment and will not be repeated.

[0137] An embodiment of the present invention further provides an electronic device comprising a memory and a processor, wherein the memory stores a computer program executed by the processor, and when the computer program is executed by the processor, the processor executes the above-mentioned new energy vehicle condenser fan control method. Various applications and various data, such as various data used and / or generated by the application, can also be stored in the memory. The processor can be a central processing unit (CPU), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other forms of processing units with data processing capabilities and / or instruction execution capabilities.

[0138] An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program executed by a processor is stored. When the computer program is executed by the processor, the processor executes the new energy vehicle condenser fan control method as described above. Exemplarily, the computer storage medium may include a memory card of a smart phone, a storage component of a tablet computer, a hard disk of a personal computer, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a portable compact disk read-only memory (CD-ROM), a USB memory, or any combination of the above storage media. The computer-readable storage medium may be any combination of one or more computer-readable storage media.

[0139] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely illustrative and are not intended to limit the scope of the present application. Various changes and modifications may be made therein by those skilled in the art without departing from the scope and spirit of the present application. All such changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0140] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0141] Similarly, it should be understood that in order to streamline the present application and aid in understanding one or more of the various inventive aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, this approach of the present application should not be interpreted as reflecting the intention that the application claimed for protection requires more features than those explicitly recited in each claim. More precisely, as reflected in the corresponding claims, the inventive point is that the corresponding technical problem can be solved with fewer features than all the features of a single disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into the detailed description, with each claim itself serving as a separate embodiment of the present application.

[0142] Those skilled in the art will understand that, except where mutually exclusive, all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or apparatus disclosed herein may be combined in any combination. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that provides the same, equivalent, or similar purpose.

[0143] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are protected by the present invention.

Claims

1. A method for controlling a condensing fan of a new energy vehicle, characterized in that: The method comprises: Determine the type of vehicle thermal management operating conditions; Determining at least one applicable control strategy for each condenser fan according to the type of the vehicle thermal management operating condition; For the same condensing fan, generating at least one speed request value through one or more independent control strategies; When there are multiple speed request values ​​for the same condensing fan, a final speed request value is determined from the multiple speed request values ​​according to a preset selection rule; The speed of the corresponding condensing fan is controlled according to the final speed request value.

2. The condensing fan control method for a new energy vehicle according to claim 1, characterized in that: The step of determining the type of vehicle thermal management operating condition includes: The type of the vehicle thermal management operating condition is determined based on the combined relationship between the vehicle's current drive component cooling demand state, passenger compartment temperature regulation demand state, and power battery temperature regulation demand state.

3. The condensing fan control method for a new energy vehicle according to claim 1, characterized in that: The types of vehicle thermal management operating conditions include: Passenger compartment temperature adjustment operating conditions, drive component cooling operating conditions, power battery temperature adjustment operating conditions, and combinations of the above operating conditions; Among them, the passenger compartment temperature adjustment working conditions include cooling working conditions and heating working conditions, and the heating working conditions include electric heating working conditions and heat pump heating working conditions.

4. The method for controlling the condensing fan of a new energy vehicle according to claim 3, characterized in that: The step of determining at least one applicable control strategy for each condenser fan according to the type of the vehicle thermal management operating condition includes: Under at least the driving component cooling condition, the same speed control strategy is adopted for all condensing fans; Under at least the passenger compartment cooling condition or the power battery cooling condition, the condenser fan speed control strategy is determined based on the ambient temperature and the compressor exhaust pressure, and the same speed control strategy is adopted for all condenser fans; Under the combined operating conditions of heat pump heating and power battery cooling, a hierarchical control strategy is adopted for the condenser fan based on the difference between the drive component inlet water temperature and the target water temperature; Under the combined operating conditions of electric heating and drive component cooling, a hierarchical control strategy is adopted for the condensing fan according to the difference between the drive component inlet water temperature and the target air outlet temperature; In at least a heat pump heating condition, a speed control strategy for at least one condensing fan is determined according to a difference between a compressor exhaust pressure and a target exhaust pressure.

5. The condensing fan control method for a new energy vehicle according to claim 4, characterized in that: The step of adopting the same speed control strategy for all condensing fans under at least the driving component cooling condition includes: Obtain the drive component inlet water temperature, drive component temperature, and drive component controller temperature; Determining the corresponding condensing fan speed request value according to the driving component inlet water temperature, the driving component temperature and the driving component controller temperature; A maximum value is selected from the corresponding speed request values ​​as the speed request value of all condensing fans.

6. The method for controlling the condensing fan of a new energy vehicle according to claim 4, characterized in that: The hierarchical control strategy includes: First, the rotation speed of the first condensing fan is adjusted; When the speed of the first condensing fan reaches a preset threshold, the speed of the second condensing fan begins to be adjusted; When the speed of the second condensing fan reaches a preset threshold, the speed of the third condensing fan begins to be adjusted; Among them, there are preset deviations in the control reference values ​​of different condensing fans.

7. The condensing fan control method for a new energy vehicle according to claim 6, characterized in that: The proportional-integral control algorithm is used to adjust the condensing fan speed. The proportional-integral control algorithm includes: Calculating a speed adjustment amount based on a difference between a control parameter and a target parameter; Perform adjustment operations according to the preset control cycle; According to the control requirements of different working conditions, select the corresponding control parameters and target parameters for proportional-integral adjustment.

8. The condenser fan control method for new energy vehicles according to claim 4, characterized in that: The step of determining the speed control strategy of at least one condensing fan according to the difference between the compressor exhaust pressure and the target exhaust pressure under at least the heat pump heating condition includes: Determine the target exhaust pressure of the compressor according to the target outlet air temperature; According to the difference between the actual exhaust pressure of the compressor and the target exhaust pressure, the speed of the first condensing fan is adjusted by a proportional integral control algorithm; The control period of the proportional-integral control algorithm is dynamically adjusted according to the ambient temperature, and the ambient temperature is negatively correlated with the control period.

9. The method for controlling a condensing fan of a new energy vehicle according to claim 1, wherein: The preset selection rules include: Compare and analyze multiple speed request values; determining a maximum value thereof as the final rotational speed request value; A limit constraint is implemented on the final speed request value so that it is between a preset speed upper limit value and a preset speed lower limit value.

10. A condensing fan control device for a new energy vehicle, characterized in that: include: The operating condition determination module is used to determine the type of vehicle thermal management operating condition; a strategy determination module, configured to determine at least one applicable control strategy for each condensing fan according to the type of the vehicle thermal management operating condition; A speed determination module, configured to generate at least one speed request value for the same condensing fan by using one or more independent control strategies; It is also used to determine a final speed request value from the multiple speed request values ​​according to a preset selection rule when there are multiple speed request values ​​for the same condensing fan; The execution control module is used to control the rotation speed of the corresponding condensing fan according to the final rotation speed request value.

11. A computer-readable storage medium, characterized in that The storage medium stores at least one instruction, which is loaded and executed by the processor to implement the new energy vehicle condensing fan control method according to any one of claims 1 to 10.

12. An electronic device, characterized in that: The electronic device includes a processor and a memory, wherein the memory stores at least one instruction, and the instruction is loaded and executed by the processor to implement the new energy vehicle condensing fan control method according to any one of claims 1 to 10.

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