CN116006312A - Engine water temperature control system and method based on engine oil temperature - Google Patents
Engine water temperature control system and method based on engine oil temperature Download PDFInfo
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- CN116006312A CN116006312A CN202211707490.XA CN202211707490A CN116006312A CN 116006312 A CN116006312 A CN 116006312A CN 202211707490 A CN202211707490 A CN 202211707490A CN 116006312 A CN116006312 A CN 116006312A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/12—Improving ICE efficiencies
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Abstract
The invention discloses an engine water temperature control system and method based on engine oil temperature, wherein the engine water temperature control system based on engine oil temperature comprises: the engine comprises an engine body, a water pump, an engine oil cooler, a radiator, a fan, a thermostat, a controller, a water temperature sensor and an engine oil temperature sensor. The engine body, the thermostat, the water pump and the engine oil cooler form a first cooling water path. The engine body, the thermostat, the radiator, the water pump and the engine oil cooler form a second cooling water path. The water temperature sensor is used for monitoring the water outlet temperature of the engine body in real time. Therefore, the engine water temperature control system based on the engine oil temperature can control proper engine oil temperature and water temperature according to the engine operation working condition, so that the engine is in an optimal lubrication and cooling state, the engine friction loss and the fan power consumption of a light-load vehicle are effectively reduced, the vehicle fuel economy is improved, the cost is low, and the system is simple.
Description
Technical Field
The invention relates to the technical field of internal combustion engine engineering, in particular to an engine water temperature control system and method based on engine oil temperature.
Background
The engine is powered by traditional power, and the heat energy generated by the combustion of fuel is used for acting part, part of the heat energy is discharged into the atmosphere through exhaust, part of the heat energy is transmitted through cooling liquid and is emitted through a vehicle cooling system, and the heat energy is lost by overcoming the friction of the engine. Therefore, reducing the friction loss of the engine is the most important means for reducing the friction loss and improving the fuel economy of the whole vehicle.
When the engine is used for selecting an engine oil cooler, in order to ensure that the engine is not damaged due to overheat coking of engine oil, an oil-water temperature difference test of the engine oil cooler is usually carried out at a maximum power point (rated power point) so as to ensure that the oil-water temperature difference is within a certain range under the maximum load, for example, the oil-water temperature difference is less than or equal to 25 ℃. When the engine runs, the ECU monitors the water outlet temperature of the engine in real time through the water temperature sensor, and when the water outlet temperature rises, the controller controls the rotating speed of the electric control silicone oil fan or the electronic fan, so that the wind speed flowing through the radiator is changed, the heat dissipation effect of the radiator is controlled, and the water temperature control is realized. When the water temperature is controlled within the specified range, the engine oil temperature must not overheat and coke.
When an actual vehicle runs, the engine rarely runs to a maximum load working condition for a long time, the thermal load of the engine is relatively low, the difference between the actual engine oil temperature and the water temperature (generally 10-12 ℃) of the engine can be far lower than the oil-water temperature difference of more than 25 ℃ under a limiting working condition, the temperature of the actual engine oil is low, the engine oil viscosity is high, the friction loss of the engine is high, and therefore the fuel consumption of the whole vehicle is relatively high. Particularly, the smaller the engine running load is, the lower the engine thermal load is, the lower the water temperature is, the lower the engine oil temperature is, and the friction loss caused by the engine oil viscosity is more prominent.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide an engine water temperature control system and method based on engine oil temperature, which can control proper engine oil temperature and water temperature according to engine operation conditions, so that an engine is in an optimal lubrication and cooling state, thereby effectively reducing engine friction loss and fan power consumption of a light-load vehicle, improving vehicle fuel economy, and being low in cost and simple in system.
To achieve the above object, in a first aspect, the present invention provides an engine water temperature control system based on an engine oil temperature, comprising: the engine comprises an engine body, a water pump, an engine oil cooler, a radiator, a fan, a thermostat, a controller, a water temperature sensor and an engine oil temperature sensor. The engine body, the thermostat, the water pump and the engine oil cooler form a first cooling water path. The engine body, the thermostat, the radiator, the water pump and the engine oil cooler form a second cooling water path. The water temperature sensor is used for monitoring the outlet water temperature of the engine body in real time, and is electrically connected with the controller. The engine oil temperature sensor is used for monitoring the engine oil temperature of the engine body in real time, and is electrically connected with the controller. The fan is electrically connected with the controller, and when the engine body is operated to a region where the oil-water temperature difference exceeds the preset oil-water temperature difference or the engine oil temperature exceeds the preset range, the controller controls the fan to increase the rotating speed, so that the temperature of engine cooling liquid is reduced, and the engine oil temperature is prevented from being too high.
In one embodiment of the present invention, the fan is an electrically controlled silicone oil fan or an electronic fan.
In one embodiment of the invention, the oil temperature sensor is mounted on the main oil gallery downstream of the oil cooler.
In a second aspect, the present invention provides an engine water temperature control method based on an engine oil temperature, comprising the steps of: and S1, operating an engine body, and monitoring the water outlet temperature and the engine oil temperature in real time by a controller. In step S2, the controller determines whether the oil temperature is higher than a temperature threshold t_oil_2. In step S3, if the engine oil temperature does not exceed the temperature threshold t_oil_2, the controller determines whether the engine oil temperature is higher than the temperature threshold t_oil_1. And S4, if the engine oil temperature is higher than the temperature threshold value T_oil_1, the controller inquires the water temperature control target correction quantity delta T based on the difference value between the engine oil temperature and the temperature threshold value T_oil_1, and adds the water temperature control target correction quantity delta T and the original target water temperature of the engine, so that the final target control water temperature of the engine body is obtained. And S5, the controller controls the fan to increase the rotating speed, so that the heat dissipation capacity of the radiator is improved, and the temperature of the engine cooling liquid is reduced.
In one embodiment of the present invention, the fan is an electrically controlled silicone oil fan or an electronic fan.
In one embodiment of the invention, the controller monitors the outlet water temperature of the engine body in real time through a water temperature sensor, and the controller monitors the engine oil temperature in real time through an engine oil temperature sensor.
In one embodiment of the invention, the oil temperature sensor is mounted on the main oil gallery downstream of the oil cooler.
In one embodiment of the present invention, the controller controls the engine body to perform the torque limiting protection function if the engine oil temperature exceeds the temperature threshold t_oil_2.
In one embodiment of the present invention, if the engine oil temperature does not exceed the temperature threshold t_oil_1, the controller calculates the target water temperature to obtain the original target water temperature of the engine.
Compared with the prior art, according to the engine oil temperature-based engine water temperature control system and method, the proper engine oil temperature and water temperature can be controlled according to the engine operation condition, so that the engine is in the optimal lubrication and cooling state, the engine friction loss and the fan power consumption of a light-load vehicle are effectively reduced, the vehicle fuel economy is improved, the cost is low, and the system is simple.
Drawings
FIG. 1 is a schematic diagram of a wire frame construction of an engine water temperature control system based on oil temperature according to an embodiment of the present invention;
FIG. 2 is a flow chart of an engine water temperature control method based on oil temperature according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a control logic wire frame of an engine water temperature control method based on an oil temperature according to an embodiment of the present invention.
The main reference numerals illustrate:
1-engine body, 2-water pump, 3-oil cooler, 4-radiator, 5-fan, 6-thermostat, 7-controller, 8-water temperature sensor, 9-engine oil temperature sensor.
Detailed Description
The following detailed description of embodiments of the invention is, therefore, to be taken in conjunction with the accompanying drawings, and it is to be understood that the scope of the invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or components.
Fig. 1 is a schematic diagram of a wire frame construction of an engine water temperature control system based on an oil temperature according to an embodiment of the present invention. As shown in fig. 1, in a first aspect, an engine water temperature control system based on an engine oil temperature according to a preferred embodiment of the present invention includes: the engine comprises an engine body 1, a water pump 2, an engine oil cooler 3, a radiator 4, a fan 5, a thermostat 6, a controller 7, a water temperature sensor 8 and an engine oil temperature sensor 9. Wherein, engine body 1, thermostat 6, water pump 2 and oil cooler 3 constitute first cooling water route. Wherein, engine body 1, thermostat 6, radiator 4, water pump 2 and oil cooler 3 constitute the second cooling water route. The water temperature sensor 8 is used for monitoring the outlet water temperature of the engine body 1 in real time, and the water temperature sensor 8 is electrically connected with the controller 7. The engine oil temperature sensor 9 is used for monitoring the engine oil temperature of the engine body 1 in real time, and the engine oil temperature sensor 9 is electrically connected with the controller 7. The fan 5 is electrically connected with the controller 7, and when the engine body 1 is operated to a region where the oil-water temperature difference exceeds the preset oil-water temperature difference or the engine oil temperature exceeds the preset range, the controller 7 controls the fan 5 to increase the rotation speed, so that the temperature of the engine coolant is reduced, and the engine oil temperature is prevented from being too high.
In one embodiment of the present invention, the fan 5 is an electrically controlled silicone oil fan or an electronic fan. An oil temperature sensor 9 is mounted on the main oil gallery downstream of the oil cooler 3.
Fig. 2 is a flowchart of an engine water temperature control method based on an engine oil temperature according to an embodiment of the present invention. As shown in fig. 2, in a second aspect, a method for controlling a water temperature of an engine based on a temperature of engine oil according to a preferred embodiment of the present invention includes the steps of: in step S1, the engine body 1 is operated, and the controller 7 monitors the outlet water temperature and the engine oil temperature in real time. In step S2, the controller 7 determines whether the oil temperature is higher than the temperature threshold t_oil_2. In step S3, if the oil temperature does not exceed the temperature threshold t_oil_2, the controller 7 determines whether the oil temperature is higher than the temperature threshold t_oil_1. In step S4, if the engine oil temperature is higher than the temperature threshold t_oil_1, the controller 7 queries the water temperature control target correction amount Δt based on the difference between the engine oil temperature and the temperature threshold t_oil_1, and adds the water temperature control target correction amount Δt to the original target water temperature of the engine, thereby obtaining the final target control water temperature of the engine body 1. In step S5, the controller 7 controls the fan 5 to increase the rotation speed, thereby increasing the heat radiation capability of the radiator 4 and further reducing the temperature of the engine coolant.
In one embodiment of the present invention, the fan 5 is an electrically controlled silicone oil fan or an electronic fan.
In one embodiment of the present invention, the controller 7 monitors the water outlet temperature of the engine body 1 in real time through the water temperature sensor 8, and the controller 7 monitors the oil temperature in real time through the oil temperature sensor 9.
In one embodiment of the invention, the oil temperature sensor 9 is mounted on the main oil gallery downstream of the oil cooler 3.
In one embodiment of the present invention, the controller 7 controls the engine body 1 to perform the torque limiting protection function if the engine oil temperature exceeds the temperature threshold t_oil_2. If the engine oil temperature does not exceed the temperature threshold t_oil_1, the controller 7 calculates a target water temperature to obtain an original target water temperature of the engine.
In practical application, the engine water temperature control system and method based on the engine oil temperature of the present invention adds an engine oil temperature sensor 9 (typically mounted on the main oil gallery downstream of the engine oil cooler 3) to detect the engine oil temperature. When the engine oil cooler 3 is actually matched, the engine oil cooler 3 with smaller cooling capacity is selected, so that the engine is in a reasonable oil-water temperature difference range during the road running of the whole vehicle, and when the engine is operated to a region where the oil-water temperature difference exceeds the traditional oil-water temperature difference setting region or a region where the engine oil temperature is excessive, the rotating speed of the fan 5 is increased and the temperature of engine cooling liquid is reduced by a control means, so that the engine is prevented from being coked and damaged due to the excessive engine oil temperature.
Fig. 3 is a schematic diagram of a control logic wire frame of an engine water temperature control method based on an oil temperature according to an embodiment of the present invention. As shown in fig. 3, the control strategy operates as follows:
1. when the engine oil temperature is higher than the temperature threshold T_oil_2, the system starts a protection mode, limits the output of the engine load, reduces the heat load of the engine, and reduces the temperature of engine cooling liquid, so that the aim of reducing the engine oil temperature is fulfilled.
2. When the engine oil temperature is lower than the temperature threshold t_oil_2 and higher than the temperature threshold t_oil_1, the controller 7 starts a water temperature target correction algorithm based on the engine oil temperature, the control system inquires the water temperature correction amount deltat based on the difference between the actual engine oil temperature and t_oil_1, if the originally calculated water temperature target is 92 ℃, the water temperature correction amount deltat calculated based on the engine oil temperature difference=5 ℃, the water temperature of the actually inquired fan 5 control rotation speed target is 92+5=97 ℃ (the higher the water temperature is, the higher the target rotation speed of the fan 5 inquired by the system is, the fan 5 control target rotation speed is increased, the wind speed is increased, the heat dissipation capacity of the radiator 44 is enhanced, and the engine cooling liquid temperature is reduced, so that the purpose of reducing the engine oil temperature is achieved.
3. When the engine oil temperature is below T_oil_1, the system controls the engine water temperature according to a conventional water temperature control algorithm.
In a word, the engine water temperature control system and the engine water temperature control method based on the engine oil temperature can control proper engine oil temperature and proper engine water temperature according to the engine operation condition, so that the engine is in an optimal lubrication and cooling state, the engine friction loss and the fan power consumption of a light-load vehicle are effectively reduced, and the fuel economy of the vehicle is improved. And the engine oil thermostat is adopted to control the engine oil temperature, so that the engine oil thermostat is not required to be added, the cost is lower, and the system is simple.
The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (9)
1. An engine water temperature control system based on engine oil temperature is characterized by comprising an engine body, a water pump, an engine oil cooler, a radiator, a fan, a thermostat, a controller, a water temperature sensor and an engine oil temperature sensor;
the engine body, the thermostat, the water pump and the engine oil cooler form a first cooling water path;
the engine body, the thermostat, the radiator, the water pump and the engine oil cooler form a second cooling water path;
the water temperature sensor is used for monitoring the water outlet temperature of the engine body in real time, and is electrically connected with the controller;
the engine oil temperature sensor is used for monitoring the engine oil temperature of the engine body in real time, and is electrically connected with the controller;
the fan is electrically connected with the controller, and when the engine body is operated to a region where the oil-water temperature difference exceeds the preset oil-water temperature difference or the engine oil temperature exceeds the preset range, the controller controls the fan to increase the rotating speed, so that the temperature of engine cooling liquid is reduced, and the engine oil temperature is prevented from being too high.
2. The engine water temperature control system based on engine oil temperature of claim 1, wherein the fan is an electrically controlled silicone oil fan or an electronic fan.
3. The engine water temperature control system based on oil temperature of claim 1, wherein the oil temperature sensor is mounted on a main oil gallery downstream of the oil cooler.
4. An engine water temperature control method based on an engine oil temperature, based on the engine water temperature control system according to claims 1 to 3, characterized in that the engine water temperature control method based on an engine oil temperature comprises the steps of:
step S1, an engine body operates, and a controller monitors the temperature of water outlet and the temperature of engine oil in real time;
step S2, the controller judges whether the engine oil temperature is higher than a temperature threshold T_oil_2;
step S3, if the engine oil temperature does not exceed the temperature threshold T_oil_2, the controller judges whether the engine oil temperature is higher than the temperature threshold T_oil_1;
step S4, if the engine oil temperature is higher than the temperature threshold value T_oil_1, the controller inquires a water temperature control target correction quantity delta T based on the difference value between the engine oil temperature and the temperature threshold value T_oil_1, and adds the water temperature control target correction quantity delta T to the original target water temperature of the engine so as to obtain the final target control water temperature of the engine body;
and S5, the controller controls the fan to increase the rotating speed, so that the heat radiation capacity of the radiator is improved, and the temperature of the engine cooling liquid is reduced.
5. The engine water temperature control method based on the engine oil temperature as set forth in claim 4, wherein the fan is an electrically controlled silicone oil fan or an electronic fan.
6. The engine water temperature control method based on an engine oil temperature as set forth in claim 4, wherein said controller monitors said outlet water temperature of said engine body in real time by a water temperature sensor, and said controller monitors said engine oil temperature in real time by an engine oil temperature sensor.
7. The engine water temperature control method based on the engine oil temperature as set forth in claim 6, wherein said engine oil temperature sensor is mounted on a main oil passage downstream of an engine oil cooler.
8. The engine water temperature control method based on the engine oil temperature as set forth in claim 4, wherein said controller controls said engine body to perform a torque limiting protection function if said engine oil temperature exceeds a temperature threshold t_oil_2.
9. The engine water temperature control method based on the engine oil temperature as set forth in claim 4, wherein said controller calculates a target water temperature to obtain an engine original target water temperature if said engine oil temperature does not exceed a temperature threshold t_oil_1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211707490.XA CN116006312A (en) | 2022-12-27 | 2022-12-27 | Engine water temperature control system and method based on engine oil temperature |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211707490.XA CN116006312A (en) | 2022-12-27 | 2022-12-27 | Engine water temperature control system and method based on engine oil temperature |
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| CN116006312A true CN116006312A (en) | 2023-04-25 |
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| CN202211707490.XA Pending CN116006312A (en) | 2022-12-27 | 2022-12-27 | Engine water temperature control system and method based on engine oil temperature |
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