CN-121976874-A - Electronic fan control method and system and electronic equipment

CN121976874ACN 121976874 ACN121976874 ACN 121976874ACN-121976874-A

Abstract

The invention belongs to the technical field of vehicle electronic fan control, and discloses an electronic fan control method, an electronic fan control system and electronic equipment. According to the method, the accurate and stable control of the rotating speed of the electronic fan is realized through the steps of cooling heat dissipation capacity calculation, actual heat dissipation capacity calculation of the radiator, fan rotating speed integral calculation and PID fine adjustment. The method comprises the steps of firstly calculating cooling heat dissipation capacity based on a target difference value between water outlet temperature of a radiator and water inlet temperature of an engine and actual heat dissipation capacity of the engine, then calculating the actual heat dissipation capacity of the radiator through parameters such as air quantity, air outlet temperature, water flow and the like of an air side of a cooling module, obtaining an initial fan rotating speed through integration according to the difference value of the air outlet temperature and the water inlet temperature of the radiator, and finally adjusting and optimizing the rotating speed through PID. Therefore, the problems of frequent start and stop of the fan and large rotation speed fluctuation in the traditional linear control are solved, the power consumption and noise of the fan are obviously reduced, the method is suitable for a whole vehicle cooling system such as a hybrid heavy truck and the like, and particularly, the method is suitable for the layout of a cooling module comprising a condenser and a double radiator, and has the advantages of high control precision and stable operation.

Inventors

ZHANG ZHONGFENG
CHEN TAO
CUI DAN
Cao Huinan
LI QUAN
YOU JIALI
SHI YUTONG
YAO JINYAN

Assignees

一汽解放汽车有限公司

Dates

Publication Date: 20260505
Application Date: 20260106

Claims (10)

1. An electronic fan control method, comprising: Determining a cooling heat dissipation capacity coefficient according to the difference value between the outlet water temperature of the radiator and the inlet water temperature target value of the engine, and calculating the cooling heat dissipation capacity by combining the engine heat dissipation capacity; The method comprises the steps of comprehensively calculating air quantity of an air side of a cooling module, air outlet temperature of the cooling module, water flow of a radiator and water outlet temperature of the radiator to obtain actual heat dissipation capacity of the radiator; Integrating the difference value between the cooling heat dissipation capacity and the actual heat dissipation capacity of the radiator and the corresponding coefficient thereof according to a set time interval to obtain an initial fan rotating speed; and fine tuning the initial fan rotating speed through PID control to obtain the final fan control rotating speed.
2. The method of claim 1, wherein determining the cooling heat dissipation factor from a difference between the outlet water temperature of the radiator and the inlet water temperature target value of the engine, and calculating the cooling heat dissipation in combination with the engine heat dissipation comprises: The method comprises the steps of obtaining a target value of water outlet temperature of a radiator and water inlet temperature of an engine, calculating a difference value of the water outlet temperature of the radiator and the target value of the water inlet temperature of the engine, inquiring a preset corresponding curve according to the difference value, outputting a cooling heat dissipation capacity coefficient, obtaining corresponding engine heat dissipation capacity according to current power of the engine in a table look-up mode, and multiplying the cooling heat dissipation capacity coefficient and the engine heat dissipation capacity to obtain cooling heat dissipation capacity.
3. The method of claim 1, wherein calculating the air flow of the cooling module comprises obtaining a fan pressure rise according to a three-dimensional MAP table of a fan rotational speed, an engine outlet temperature and a fan air volume, calculating a grid pressure rise according to a vehicle speed and an ambient temperature, adding the fan pressure rise to the grid pressure rise, obtaining a fan air flow through a corresponding graph, taking the fan air flow as a first radiator air flow, and obtaining a second radiator air flow and a condenser air flow by multiplying the fan air flow by corresponding coefficients.
4. The method of claim 3 wherein calculating the outlet air temperature of the cooling module comprises calculating a condenser outlet air temperature, a second radiator outlet air temperature and a first radiator inlet air temperature, respectively, and determining the cooling module outlet air temperature, wherein calculating the condenser outlet air temperature comprises obtaining a condenser inlet enthalpy value according to a compressor outlet temperature and a pressure lookup table, inquiring a condenser outlet theoretical temperature based on condenser condensation isobaric characteristics, and obtaining a condenser outlet temperature by making a difference with a set supercooling degree; The second radiator air outlet temperature is calculated by inquiring the water flow of the second radiator and the air flow of the second radiator to obtain the second radiator efficiency, calculating the second radiator heat dissipation capacity according to the second radiator efficiency, and then calculating the second radiator air outlet temperature through a theoretical formula by combining the engine outlet temperature and the water flow of the second radiator; Calculating the air inlet temperature of the first radiator comprises determining the air inlet temperature of the first radiator based on the air side flow of the second radiator, the air side flow of the condenser, the air outlet temperature of the second radiator, the ambient temperature, and the ambient air inlet quantity of the first radiator.
5. The method of claim 3, wherein calculating the radiator water flow comprises obtaining water pump outlet water flow by looking up a table of water pump rotational speeds and three-way valve opening degrees, obtaining ratios of the first and second radiator water flow to the water pump outlet water flow by looking up MAP tables corresponding to different water pump rotational speeds and three-way valve opening degrees, and calculating the first and second radiator water flow by combining the water pump outlet water flow.
6. The method of claim 4, wherein the actual heat dissipation capacity of the radiator is a sum of the heat dissipation capacity of the first radiator and the heat dissipation capacity of the second radiator, and wherein the calculating of the heat dissipation capacity of the first radiator comprises obtaining a first radiator efficiency according to a first radiator water flow and a first radiator wind flow inquiry, and calculating by a theoretical formula in combination with a first radiator air inlet temperature, an engine water outlet temperature, a first radiator water flow and a first radiator efficiency.
7. The method of claim 1, wherein the corresponding coefficients are obtained by MAP table lookup using actual power of the stack as input; the set time interval is a time period with a fixed duration.
8. The method of claim 1 wherein the fine tuning the initial fan speed by PID control to obtain a final fan control speed comprises calculating a difference between an engine water inlet demand temperature and a radiator outlet temperature with the radiator outlet temperature as a control target value, calibrating P, I and D parameters of a PID controller based on the difference, inputting the initial fan speed to the PID controller, and fine tuning the initial fan speed by a PID adjustment algorithm to obtain the final fan control speed.
9. An electronic fan control system, the system comprising: The cooling heat dissipation capacity calculation module is used for determining a cooling heat dissipation capacity coefficient according to the difference value between the outlet water temperature of the radiator and the inlet water temperature target value of the engine, and calculating the cooling heat dissipation capacity by combining the cooling heat of the engine; the actual heat dissipation capacity calculation module is used for comprehensively calculating the air side air quantity of the cooling module, the air outlet temperature of the cooling module, the water flow of the radiator and the water outlet temperature of the radiator to obtain the actual heat dissipation capacity of the radiator; The initial rotation speed determining module is used for integrating the difference value between the cooling heat dissipation capacity and the actual heat dissipation capacity of the radiator and the corresponding coefficient of the difference value according to a set time interval to obtain the initial fan rotation speed; and the PID regulating module is used for carrying out fine adjustment on the initial fan rotating speed through PID control to obtain the final fan control rotating speed.
10. An electronic device comprising a memory and a processor, wherein the memory stores a computer program which, when executed by the processor, causes the processor to perform the steps of the electronic fan control method as claimed in any one of claims 1 to 8.

Description

Electronic fan control method and system and electronic equipment Technical Field The invention belongs to the technical field of vehicle electronic fan control, and particularly relates to an electronic fan control method, an electronic fan control system and electronic equipment. Background In the whole vehicle cooling system, an electronic fan is a key component, and the rotation speed control of the electronic fan directly influences the cooling effect, the energy consumption and the operation noise. At present, a mode of linear control of water temperature and fan rotating speed is commonly adopted in the industry, and the control method is simple in structure and easy to realize, but has obvious defects that the frequent start and stop of the fan are easily caused by linear adjustment only by depending on a single parameter of water temperature, and the rotating speed is suddenly high and suddenly low, so that the power consumption of the fan is excessively high, larger running noise is generated, and the economy and the comfort of the whole vehicle are influenced. In the prior related patent technology, as a 'fan motor rotating speed accurate control method based on heat dissipation capacity' with a patent number of CN 111005798B, the heat dissipation capacity is calculated by testing the air inlet temperature and the water inlet temperature of the radiator through a sensor, and meanwhile, the air inlet flow is reversely pushed according to the structure, the heat exchange area, the heat transfer coefficient and the air inlet temperature of the radiator. However, in the technical scheme, key influencing factors such as vehicle speed, ambient temperature, fan rotating speed and the like are not fully considered in the process of calculating the heat dissipation capacity and deducing the air intake flow, so that the accuracy of a calculation result is limited, and the fan control requirement under the complex working condition is difficult to meet. Disclosure of Invention In order to solve the problems of insufficient fan control precision, high power consumption and large noise in the prior art, the invention provides a model-based electronic fan control method, a model-based electronic fan control system and electronic equipment, which realize stable and accurate control of the fan rotating speed by integrating multidimensional parameters such as vehicle speed, ambient temperature, engine load and the like and through multi-parameter fusion calculation and PID regulation. The invention aims at adopting the following technical scheme: In one aspect of the present invention, an electronic fan control method is provided, the method includes: Determining a cooling heat dissipation capacity coefficient according to the difference value between the outlet water temperature of the radiator and the inlet water temperature target value of the engine, and calculating the cooling heat dissipation capacity by combining the engine heat dissipation capacity; The method comprises the steps of comprehensively calculating air quantity of an air side of a cooling module, air outlet temperature of the cooling module, water flow of a radiator and water outlet temperature of the radiator to obtain actual heat dissipation capacity of the radiator; Integrating the difference value between the cooling heat dissipation capacity and the actual heat dissipation capacity of the radiator and the corresponding coefficient thereof according to a set time interval to obtain an initial fan rotating speed; and fine tuning the initial fan rotating speed through PID control to obtain the final fan control rotating speed. Optionally, the determining the cooling heat dissipation capacity coefficient according to the difference between the outlet water temperature of the radiator and the inlet water temperature target value of the engine, and calculating the cooling heat dissipation capacity in combination with the engine heat dissipation capacity includes: The method comprises the steps of obtaining a target value of water outlet temperature of a radiator and water inlet temperature of an engine, calculating a difference value of the water outlet temperature of the radiator and the target value of the water inlet temperature of the engine, inquiring a preset corresponding curve according to the difference value, outputting a cooling heat dissipation capacity coefficient, obtaining corresponding engine heat dissipation capacity according to current power of the engine in a table look-up mode, and multiplying the cooling heat dissipation capacity coefficient and the engine heat dissipation capacity to obtain cooling heat dissipation capacity. Optionally, the calculating the air side air quantity of the cooling module comprises obtaining fan pressure rise according to a three-dimensional MAP table of fan rotation speed, engine outlet temperature and fan air quantity, obtaining grid pressure rise according to calculation of vehicle speed and