CN111577441A - Control method of engine cooling system - Google Patents
Control method of engine cooling system Download PDFInfo
- Publication number
- CN111577441A CN111577441A CN202010530497.3A CN202010530497A CN111577441A CN 111577441 A CN111577441 A CN 111577441A CN 202010530497 A CN202010530497 A CN 202010530497A CN 111577441 A CN111577441 A CN 111577441A
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- Prior art keywords
- engine
- temperature
- management system
- map table
- thermostat
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- 238000001816 cooling Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000002826 coolant Substances 0.000 claims abstract description 43
- 239000000110 cooling liquid Substances 0.000 claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 15
- 238000011217 control strategy Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 27
- 239000000446 fuel Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/02—Controlling of coolant flow the coolant being cooling-air
- F01P7/04—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/02—Controlling of coolant flow the coolant being cooling-air
- F01P7/08—Controlling of coolant flow the coolant being cooling-air by cutting in or out of pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention provides a control method of an engine cooling system, which comprises the following steps: calibrating the temperature distribution of each test point when the engine is in the optimal working state under different working conditions, and making a MAP table and storing the MAP table into an engine management system; calibrating the relationship between the inlet temperature and the outlet temperature of the engine coolant and the temperature of each test point of the engine under a certain working condition, and making a MAP (MAP) table and storing the MAP table in an engine management system; calibrating the relation between the power of the electronic fan and the opening of the thermostat and the inlet temperature and the outlet temperature of the engine coolant under the same working condition, and making an MAP table and storing the MAP table in an engine management system; the engine management system establishes intelligent cooling control strategies of the engine under different working conditions according to the stored MAP table; and the engine management system controls the inlet temperature and the outlet temperature of the engine cooling liquid, the power of the electronic fan and the opening degree of the thermostat according to an intelligent cooling control strategy. The invention can reduce the temperature distribution difference and water temperature fluctuation of each test point of the engine.
Description
Technical Field
The invention belongs to the technical field of engine cooling systems, and particularly relates to a control method of an engine cooling system.
Background
To ensure that the engine remains within the proper temperature range under all operating conditions, most engines have been designed with cooling systems. The engine cooling system is generally composed of a water tank, a fan, a radiator, a water pump, a water pipe, a machine body, a cylinder cover water jacket, a thermostat, a temperature sensor and the like. Since the temperature of the coolant is low when the engine is cold started, if the coolant is cooled by the radiator and then returns to the engine, the temperature rise rate of the coolant is slow. In order to shorten the time for the temperature of the cooling liquid to rise to the set temperature, the cooling system comprises two loops of a large loop and a small loop, and the selection switches of the two loops are thermostats, namely, the thermostats can enable the cooling system to go through the small loop when the temperature of the cooling liquid is low and go through the large loop after the temperature reaches the set value.
The specification of the chinese invention patent CN 201310055280.1 discloses an engine cooling system optimization design method, which is based on a computer simulation processing technology, and uses fluid dynamics analysis software to perform one-dimensional simulation on a cooling system to simulate the pressure distribution, flow distribution, temperature distribution, etc. of the cooling system at the initial stage of design, so as to obtain optimized matching parameters through parameter optimization, and evaluate and improve the cooling system according to the optimized parameters to meet the design requirements.
The specification of the chinese patent CN 201510997668.2 discloses a method for cooling a vehicle, which can adjust the flow cross-sectional area of a radiator in real time according to different working conditions of the vehicle to make the coolant at a theoretical cooling temperature, wherein the theoretical cooling temperature is the temperature of the coolant when the engine of the vehicle is in an optimal working state, and the theoretical flow cross-sectional area of the radiator under different working conditions of the vehicle simulates different working conditions of the vehicle through an engine pedestal thermal balance test and monitors the flow rate of the coolant, the wind speed and the change of the temperature of the coolant under different working conditions to calculate the theoretical heat dissipation capacity of the engine under each corresponding working condition, and then calculates the theoretical flow cross-sectional area of the radiator to be matched through heat dissipation capacity simulation software.
However, none of the prior art embodies how to intelligently and precisely control the flow ratio of the small and large cycles to meet the temperature requirements of the engine under different operating conditions.
Disclosure of Invention
In view of the above prior art, the technical problem to be solved by the present invention is to provide a method for controlling an engine cooling system, which can intelligently and accurately control the flow rate ratio between a small circulation flow rate and a large circulation flow rate.
In order to solve the technical problem, the invention provides a control method of an engine cooling system, which comprises the following steps:
1) calibrating the temperature distribution of each test point when the engine is in the optimal working state under different working conditions, and making a MAP table and storing the MAP table into an engine management system;
2) calibrating the relationship between the inlet temperature and the outlet temperature of the engine coolant and the temperature of each test point of the engine under a certain working condition, and making a MAP (MAP) table and storing the MAP table in an engine management system;
3) calibrating the relation between the power of the electronic fan and the opening of the thermostat and the inlet temperature and the outlet temperature of the engine coolant under the same working condition, and making an MAP table and storing the MAP table in an engine management system;
4) the engine management system establishes intelligent cooling control strategies of the engine under different working conditions according to the stored MAP table;
5) and the engine management system controls the inlet temperature and the outlet temperature of the engine cooling liquid, the power of the electronic fan and the opening degree of the thermostat according to an intelligent cooling control strategy.
Preferably, the engine management system can respectively acquire the inlet temperature and the outlet temperature of the engine coolant and the temperature of each test point when the engine is in the optimal working state under different working conditions through the temperature sensor, and can control the start and stop of the electronic fan, the rotating speed and the opening degree of the thermostat.
Preferably, the opening degree of the thermostat is changed from 0 to 100.
Compared with the prior art, the invention has the beneficial effects that: the invention can obtain the inlet temperature and the outlet temperature of the engine cooling liquid and the temperature distribution of each test point when the engine is in the best working state under different working conditions through the engine management system, and simultaneously establish the intelligent cooling control strategy of the engine under different working conditions through the manufactured MAP table, thereby controlling the start-stop, the rotating speed and the opening degree of the thermostat of the electronic fan, controlling the flow ratio of large circulation and small circulation, further better reducing the temperature distribution difference and the water temperature fluctuation of each test point of the engine and improving the performance of the engine.
Drawings
Fig. 1 is a schematic structural diagram of a cooling system of an engine of a conventional fuel-powered automobile.
Illustration of the drawings: the system comprises a water pump 1, an engine water jacket 2, a thermostat 3, a radiator 4, an electronic fan 5, a heat exchanger 6, an engine management system 7, a water temperature sensor I8 and a water temperature sensor II 9.
Detailed Description
The invention will be further described with reference to the drawings and preferred embodiments.
The invention provides a control method of an engine cooling system, which can be based on the existing engine cooling system of a fuel automobile or an engine cooling system of an electric automobile.
In order to facilitate understanding of the invention, a control method based on an existing fuel automobile engine cooling system is provided, and a structural schematic diagram of the fuel automobile engine cooling system based on the control method is shown in fig. 1 and comprises a water pump 1, an engine water jacket 2, a thermostat 3, a radiator 4, an electronic fan 5, a heat exchanger 6, an engine management system 7, a water temperature sensor I8 and a water temperature sensor II 9. The engine water jacket 2 comprises a casting water jacket arranged on the engine body and the cylinder cover, and can absorb heat of the engine body and the cylinder cover through cooling liquid flowing through the casting water jacket; the water pump 1 is arranged at a coolant inlet of the engine water jacket 2 and can pressurize coolant to ensure that the coolant can circularly flow in an engine cooling system; the thermostat 3 is arranged at a coolant outlet of the engine water jacket 2, and can determine whether the coolant flows through a small circulation or a large circulation according to the opening degree of the thermostat, namely, the thermostat 3 is provided with two coolant outlets, one of which is communicated with a coolant inlet of the water pump 1, and the other is communicated with a coolant inlet of the radiator 4; the radiator 4 is arranged in front of the engine, can cool the cooling liquid flowing through the radiator core in an air cooling mode, and sends the cooled cooling liquid into the water pump 1; the electronic fan 5 is arranged on the radiator frame and is tightly attached to the radiator 4, and can further radiate the radiator 4 by controlling the airflow flowing through the radiator 4; the heat exchanger 6 is a device which is arranged in the air conditioning system and can heat natural wind or circulating wind through high-temperature coolant, a coolant inlet of the heat exchanger can be communicated with a coolant outlet of the engine water jacket 2, and a coolant outlet of the heat exchanger can be communicated with a coolant inlet of the water pump 1; the engine management system 7 can acquire the inlet temperature and the outlet temperature of engine cooling liquid through the water temperature sensor I8 and the water temperature sensor II 9, can acquire the temperature of each test point of the engine through the temperature sensors arranged on the engine body and the cylinder cover, and can ensure that the engine works in the best working state by controlling the starting and stopping of the electronic fan, the rotating speed and the opening degree of the thermostat.
Based on the engine cooling system of the fuel automobile, the invention provides a corresponding control method of the engine cooling system, which comprises the following steps:
1) calibrating the temperature distribution of each test point when the engine is in the optimal working state under different working conditions, and making a MAP table and storing the MAP table into an engine management system;
2) calibrating the relationship between the inlet temperature and the outlet temperature of the engine coolant and the temperature of each test point of the engine under a certain working condition, and making a MAP (MAP) table and storing the MAP table in an engine management system;
3) calibrating the relation between the power of the electronic fan and the opening of the thermostat and the inlet temperature and the outlet temperature of the engine coolant under the same working condition, and making an MAP table and storing the MAP table in an engine management system;
4) the engine management system establishes intelligent cooling control strategies of the engine under different working conditions according to the stored MAP table;
5) and the engine management system controls the inlet temperature and the outlet temperature of the engine cooling liquid, the power of the electronic fan and the opening degree of the thermostat according to an intelligent cooling control strategy.
For the sake of understanding, the following is a specific application of the control method of the engine cooling system:
and S1, igniting and starting the engine, and controlling the water pump to start by the engine management system.
And S2, the engine management system acquires the inlet temperature and the outlet temperature of the engine cooling liquid and then calls a corresponding intelligent cooling control strategy.
And S3, if the inlet temperature and the outlet temperature of the engine cooling liquid are both lower than 80 ℃, the engine management system controls the electronic fan to stop running, and the thermostat has 100% of flow passing through a small circulation, so that the inlet temperature and the outlet temperature of the engine cooling liquid can be simultaneously increased to be higher than 80 ℃.
And S4, if the inlet temperature and the outlet temperature of the engine cooling liquid are simultaneously raised to 80-85 ℃, controlling the opening of the thermostat by the engine management system so that the flow ratio of the small circulation to the large circulation is 10-50%.
S5, if the temperature of the coolant outlet of the engine is higher than 85 ℃, the engine management system controls the electronic fan to start; at this time, if the temperature of the outlet of the engine coolant continues to rise, the engine management system controls the opening of the thermostat so as to enable the flow rate of the coolant flowing through the large circulation to rise, and when the temperature of the outlet of the engine coolant rises to 88 ℃ and the temperature of the inlet of the engine coolant is higher than 80 ℃, the engine management system controls the thermostat to flow through the large circulation by 100 percent.
S6, if the temperature of the outlet of the engine coolant drops to 86 ℃, controlling the opening of the thermostat by the engine management system to enable the flow ratio of the flow passing through the large circulation to drop to 80-50%, and enabling the temperature of the outlet of the engine coolant to be stabilized at 86-90 ℃ and the temperature of the inlet of the engine coolant to be higher than 80 ℃; if the engine coolant outlet temperature is above 90 ℃, the engine management system issues an over-temperature alarm and reduces the output power until the engine coolant outlet temperature is below 88 ℃.
S7, if the temperature of the cooling liquid outlet of the engine is lower than 85 ℃, the engine management system controls the electronic fan to stop rotating; at this point, if the engine coolant outlet temperature is still falling below 82 ℃, the engine management system controls the thermostat to flow 100% through the small loop.
S8, if the temperature of the outlet of the engine coolant rises to 84 ℃, controlling the opening of the thermostat by the engine management system to enable the flow ratio of the flow passing through the small circulation to be reduced to 80-50%, and enabling the temperature of the outlet of the engine coolant to be stabilized at 86-90 ℃ and the temperature of the inlet of the engine coolant to be higher than 80 ℃; if the temperature of the cooling liquid outlet of the engine is higher than 90 ℃ and a driver triggers flameout through a key, the engine management system controls the engine to keep idling and controls the thermostat to flow through a large circulation at 100% of flow, the electronic fan is started, and after the temperature of the cooling liquid outlet of the engine is lower than 90 ℃, the engine management system executes a flameout instruction.
The foregoing merely represents preferred embodiments of the invention, which are described in some detail and detail, and therefore should not be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various changes, modifications and substitutions can be made without departing from the spirit of the present invention, and these are all within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (3)
1. A control method of an engine cooling system, characterized by comprising the steps of:
1) calibrating the temperature distribution of each test point when the engine is in the optimal working state under different working conditions, and making a MAP table and storing the MAP table into an engine management system;
2) calibrating the relationship between the inlet temperature and the outlet temperature of the engine coolant and the temperature of each test point of the engine under a certain working condition, and making a MAP (MAP) table and storing the MAP table in an engine management system;
3) calibrating the relation between the power of the electronic fan and the opening of the thermostat and the inlet temperature and the outlet temperature of the engine coolant under the same working condition, and making an MAP table and storing the MAP table in an engine management system;
4) the engine management system establishes intelligent cooling control strategies of the engine under different working conditions according to the stored MAP table;
5) and the engine management system controls the inlet temperature and the outlet temperature of the engine cooling liquid, the power of the electronic fan and the opening degree of the thermostat according to an intelligent cooling control strategy.
2. The control method of an engine cooling system according to claim 1, characterized in that: the engine management system can respectively acquire the inlet temperature and the outlet temperature of the engine cooling liquid and the temperature of each test point when the engine is in the optimal working state under different working conditions through the temperature sensor, and can control the start and stop of the electronic fan, the rotating speed and the opening degree of the thermostat.
3. A control method of an engine cooling system according to claim 1 or 2, characterized in that: the opening degree of the thermostat comprises a change from 0 to 100.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010530497.3A CN111577441A (en) | 2020-06-11 | 2020-06-11 | Control method of engine cooling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010530497.3A CN111577441A (en) | 2020-06-11 | 2020-06-11 | Control method of engine cooling system |
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| CN111577441A true CN111577441A (en) | 2020-08-25 |
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| CN202010530497.3A Pending CN111577441A (en) | 2020-06-11 | 2020-06-11 | Control method of engine cooling system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113606030A (en) * | 2021-09-03 | 2021-11-05 | 苏州睿昕汽车配件有限公司 | Control method of engine cooling system |
| WO2022228309A1 (en) * | 2021-04-27 | 2022-11-03 | 比亚迪股份有限公司 | Thermal management control method and device, storage medium, and vehicle |
| CN115962040A (en) * | 2023-02-02 | 2023-04-14 | 重庆赛力斯新能源汽车设计院有限公司 | Engine cooling control method, system, equipment and storage medium |
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| CN208650995U (en) * | 2017-11-30 | 2019-03-26 | 中国人民解放军陆军军事交通学院 | Diesel Engine Altitude Adaptive System |
| CN110529227A (en) * | 2018-05-23 | 2019-12-03 | 中国人民解放军陆军军事交通学院 | Diesel engine cooling system with variable water flow becomes height above sea level control strategy |
| CN111120072A (en) * | 2018-10-31 | 2020-05-08 | 长城汽车股份有限公司 | Control method and system of engine cooling system, engine system and vehicle |
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2020
- 2020-06-11 CN CN202010530497.3A patent/CN111577441A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102230847A (en) * | 2011-04-01 | 2011-11-02 | 浙江大学 | Test device for engine thermal management system |
| CN105114166A (en) * | 2015-09-09 | 2015-12-02 | 柳工无锡路面机械有限公司 | Milling machine engine thermal management system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022228309A1 (en) * | 2021-04-27 | 2022-11-03 | 比亚迪股份有限公司 | Thermal management control method and device, storage medium, and vehicle |
| US12188398B2 (en) | 2021-04-27 | 2025-01-07 | Byd Company Limited | Thermal management and control method and device, storage medium, and vehicle |
| CN113606030A (en) * | 2021-09-03 | 2021-11-05 | 苏州睿昕汽车配件有限公司 | Control method of engine cooling system |
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| CN115962040A (en) * | 2023-02-02 | 2023-04-14 | 重庆赛力斯新能源汽车设计院有限公司 | Engine cooling control method, system, equipment and storage medium |
| CN115962040B (en) * | 2023-02-02 | 2024-06-11 | 重庆赛力斯新能源汽车设计院有限公司 | Engine cooling control method, system, equipment and storage medium |
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