CN113586224A - Intelligent cooling system based on engine split cooling and control method thereof - Google Patents
Intelligent cooling system based on engine split cooling and control method thereof Download PDFInfo
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- CN113586224A CN113586224A CN202110991404.1A CN202110991404A CN113586224A CN 113586224 A CN113586224 A CN 113586224A CN 202110991404 A CN202110991404 A CN 202110991404A CN 113586224 A CN113586224 A CN 113586224A
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- 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
- F01P7/164—Controlling of coolant flow the coolant being liquid by thermostatic control by varying pump speed
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- 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
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
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- 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
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/04—Arrangements of liquid pipes or hoses
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- 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
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/14—Indicating devices; Other safety devices
- F01P11/16—Indicating devices; Other safety devices concerning coolant temperature
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- 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
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/14—Indicating devices; Other safety devices
- F01P11/18—Indicating devices; Other safety devices concerning coolant pressure, coolant flow, or liquid-coolant level
Abstract
The invention discloses an intelligent cooling system based on engine split cooling and a control method thereof. During cold start, cooling liquid only flows through the cylinder cover and the exhaust manifold water jacket; during warming, part of cooling liquid in a cylinder cover water jacket flows into a machine body water jacket through a communicating pipe, the flow of the cooling liquid is controlled by a first electronic thermostat, and the cold starting and warming processes are accelerated by utilizing the heat dissipation of an exhaust manifold. When the engine runs normally, the opening of the two electronic thermostats and the rotating speeds of the water pump and the fan motor are controlled according to the temperature MAP of the cooling liquid at the outlet of the cylinder cover, the flow of the cooling liquid entering the cylinder cover and the water jacket of the engine body is accurately regulated, and the power consumption of the two motors is minimum while the cooling intensity is ensured. The invention automatically controls the flow and temperature of the cooling liquid according to the working condition of the engine, so that the engine works at the optimal temperature to reduce oil consumption and accessory loss.
Description
Technical Field
The invention relates to the field of intelligent cooling of engines, in particular to an intelligent cooling system based on engine split cooling and a control method.
Background
With the application of computer technology to automobiles, the development trend of the cooling capacity regulation mode of the automobile engine is intelligent control, namely, an electronic control unit is used for intelligently controlling an electronic water pump, an electronic thermostat and an electronic fan, so that the heat transfer loss and the mechanical loss of the engine are reduced to the maximum extent. And the cooling to cylinder cap, cylinder liner in traditional cooling system adopts the mode of the integrated water jacket, and the coolant liquid gets into cylinder cap water jacket cooling cylinder cap through last water hole after getting into organism water jacket cooling cylinder liner earlier, and because cylinder cap heat load is higher than the cylinder liner, the cooling strength of cylinder cap and cylinder liner can not independently be adjusted to this kind of cooling method, consequently can cause the cylinder cap to cool down inadequately or the cylinder liner overcooling phenomenon. Meanwhile, when the automobile engine runs in a cold state, the abrasion degree of parts of the engine is increased, and the emission and the oil consumption are obviously higher than those in a heat engine state.
Disclosure of Invention
In order to solve the problems, the invention provides an intelligent cooling system based on engine split cooling and a control method thereof, which can accelerate the cold start and warm-up processes of an engine by automatically adjusting and controlling the temperature and flow of cooling liquid and simultaneously incorporating an exhaust manifold cooling water jacket, ensure that the engine works in an optimal temperature state, reduce the fuel consumption and accessory loss, improve and improve the economy of the engine, reduce the abrasion and prolong the service life of the engine.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an intelligent cooling system based on engine split cooling comprises an electronic water pump, a cylinder cover water jacket, an integrated exhaust manifold cooling water jacket, a machine body water jacket, a first electronic thermostat, a radiator, a second electronic thermostat, a plurality of temperature sensors and an electronic control unit;
the temperature sensors are connected with the electronic control unit;
the outlet of the electronic water pump is divided into two paths, one path is connected with the inlet of the water jacket of the cylinder cover, the other path is connected with the inlet of the cooling water jacket of the integrated exhaust manifold, the outlet of the water jacket of the cylinder cover and the outlet of the cooling water jacket of the integrated exhaust manifold are converged and connected with the inlet of the tee joint, the outlet of the tee joint is divided into two paths, one path is connected with the inlet of the radiator, the other path is connected with the outlet of the first electronic thermostat, the outlet of the radiator is connected with the first inlet of the second electronic thermostat, and the outlet of the first electronic thermostat is connected with the second inlet of the second electronic thermostat; the outlet of the second electronic thermostat is connected with the inlet of the electronic water pump;
the cylinder cover water jacket is also connected with an engine body water jacket inlet, and an engine body water jacket outlet is connected with a first electronic thermostat inlet; the second electronic thermostat comprises a first inlet and a second inlet, the first inlet is connected with the outlet of the radiator, and the second inlet is connected with the outlet of the first electronic thermostat; the outlet of the second electronic thermostat is connected with the inlet of the electronic water pump.
The invention is further improved in that the plurality of temperature sensors comprise a first temperature sensor, a second temperature sensor, a third temperature sensor and a fourth temperature sensor, and the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor are all connected with the electronic control unit.
The invention is further improved in that a first temperature sensor is installed at the inlet of the first electronic thermostat, a second temperature sensor is installed at the junction of the outlet of the cylinder head water jacket and the outlet of the integrated exhaust manifold cooling water jacket, a third temperature sensor is installed on the pipeline between the first electronic thermostat and the second electronic thermostat, and a fourth temperature sensor is installed between the first inlet of the second electronic thermostat and the outlet of the radiator.
The invention is further improved in that one side of the radiator is provided with an electronic fan.
The invention is further improved in that the electronic fan is connected with a first motor.
The invention is further improved in that the electronic water pump is connected with a second motor.
The invention has the further improvement that under the working condition of the cold machine, when the temperature of the cooling liquid is lower than the preset value, the first electronic thermostat is closed, the cooling liquid is pumped into the cylinder cover water jacket and the integrated exhaust manifold cooling water jacket, and the cooling liquid in the cylinder cover water jacket and the integrated exhaust manifold cooling water jacket is converged and then flows into the electronic water pump through the second electronic thermostat;
under the working condition of warming, when the temperature of the cooling liquid is higher than a preset value and lower than the temperature preset value under the normal operation working condition, the cooling liquid is pumped into a cylinder cover water jacket and an integrated exhaust manifold cooling water jacket, part of the cooling liquid in the cylinder cover water jacket flows into a machine body water jacket, then flows into a first electronic thermostat, then is converged with an outlet of the cylinder cover water jacket and an outlet of the integrated exhaust manifold cooling water jacket, then flows through a second electronic thermostat, and then flows into an electronic water pump;
under the normal operation working condition, when the temperature of the cooling liquid is greater than or equal to the preset value of the temperature of the normal operation working condition, the cooling liquid is pumped into the cylinder cover water jacket and the integrated exhaust manifold cooling water jacket, part of the cooling liquid in the cylinder cover water jacket flows through the engine body water jacket, then flows through the first electronic thermostat, then is converged with the cylinder cover water jacket and the outlet of the integrated exhaust manifold cooling water jacket, flows through the radiator for cooling, then flows through the second electronic thermostat, and finally flows into the electronic water pump.
When the working condition of the cold machine is met, the electronic control unit judges whether the temperature of the cooling liquid is lower than a preset value T according to a temperature signal of a first temperature sensor, if the temperature of the cooling liquid is lower than the preset value, a first electronic thermostat is closed, the cooling liquid is pumped into a cylinder cover water jacket and an integrated exhaust manifold cooling water jacket, then the cooling liquid is converged into a second electronic thermostat, and finally the cooling liquid flows into an electronic water pump to form cold machine circulation; the electronic control unit controls the opening of the second electronic thermostat and adjusts the rotating speed of the electronic water pump according to the operating condition of the engine and the temperature signal acquired by the third temperature sensor;
under the warming condition, when the temperature of the cooling liquid rises to a preset limit value and is lower than a preset temperature value under the normal operation condition, the electronic control unit judges whether the temperature of the cooling liquid is higher than a preset value T according to a temperature signal of the first temperature sensor, if the temperature of the cooling liquid is higher than the preset value T, the first electronic thermostat is started, judges whether the temperature of the cooling liquid is lower than a preset temperature value Tc under the normal operation condition according to a temperature signal of the third temperature sensor, and if the temperature of the cooling liquid is lower than the preset temperature value Tc under the normal operation condition, the first inlet of the second electronic thermostat is closed and the second inlet is opened; the electronic control unit controls the opening of the first electronic thermostat according to the operating condition of the engine and the temperature signal of the first temperature sensor so as to control the flow of the cooling liquid entering the water jacket of the engine body, and controls the opening of the second inlet of the second electronic thermostat and the rotating speed of the electronic water pump according to the operating condition of the engine and the temperature signal of the third temperature sensor so as to regulate the flow of the cooling liquid entering the water jacket of the cylinder cover, the cooling water jacket of the exhaust manifold and the water jacket of the engine body; the cooling liquid is heated by the cylinder cover, the cylinder sleeve and the exhaust manifold, when the temperature of the cooling liquid rises to a preset temperature Tc, a first inlet of the second electronic thermostat is opened, then the cooling liquid enters the electronic water pump after being cooled by the radiator, and the warming-up process is finished.
When the engine normally works, the electronic control unit judges whether the temperature of the cooling liquid is greater than or equal to a preset value of the temperature of a normal operation working condition according to a temperature signal of the second temperature sensor, if the temperature of the cooling liquid is greater than or equal to the preset value of the temperature of the normal operation working condition, the first electronic thermostat is opened, the first inlet of the second electronic thermostat is opened, the second inlet of the second electronic thermostat is closed, the cooling liquid is pumped into the cylinder cover water jacket and the integrated exhaust manifold cooling water jacket, the electronic control unit regulates the opening of the first electronic thermostat according to the temperature signals of the temperature MAP of the cooling liquid at the outlet of the cylinder cover, the first temperature sensor, the second temperature sensor and the fourth temperature sensor, distributes the flow of the cooling liquid entering the engine water jacket, controls the opening of the first inlet of the second electronic thermostat and the rotating speed of the electronic water pump, and regulates the total flow of the cooling liquid in the system; after the cooling liquid flows through the cylinder cover water jacket and the engine body water jacket, the cooling liquid in the engine body water jacket, the residual cooling liquid in the cylinder cover water jacket and the cooling liquid in the integrated exhaust manifold cooling water jacket are converged in the first electronic thermostat and then flow into the radiator, and after the temperature of the cooling liquid is reduced, the cooling liquid flows into the electronic water pump through the second electronic thermostat to form circulation.
Compared with the prior art, the invention has the following beneficial effects: the cooling liquid is pumped into a cylinder cover water jacket and an exhaust manifold cooling water jacket for cooling, the first electronic thermostat regulates the amount of the cooling liquid entering a machine body water jacket from the cylinder cover water jacket according to a temperature signal and an engine working condition signal, the cooling liquid does not pass through a radiator under the working conditions of cooling and warming, and the first electronic thermostat and the second electronic thermostat are connected in series to form a small cycle. When the engine is in normal operation, the residual cooling liquid of the water jacket of the cylinder cover is converged with the cooling liquid of the exhaust manifold, then converged with the water outlet pipe of the first electronic thermostat and flows into the radiator, water-air convection heat exchange is carried out, and the water outlet pipe of the radiator is connected with the second electronic thermostat to form a large circulation. The invention can automatically adjust and control the temperature and the flow of the cooling liquid through the first electronic thermostat and the second electronic thermostat, and simultaneously, the first electronic thermostat and the second electronic thermostat are combined with the exhaust manifold cooling water jacket, thereby accelerating the cold start and warm-up processes of the engine, ensuring that the engine works in the optimal temperature state, reducing the fuel consumption and the accessory loss and improving the economy of the engine. The invention can greatly shorten the cold start and warm-up time of the engine, ensure that the engine works in the optimal temperature state, reduce the fuel consumption and the accessory loss to improve and enhance the economy of the engine, reduce the abrasion and prolong the service life of the engine, thereby avoiding the problems that the abrasion degree of parts of the engine is intensified and the emission and the oil consumption are obviously higher than those of a heat engine when the automobile engine runs in a cold machine state.
Furthermore, the engine body water jacket is connected with a first electronic thermostat, and the engine body water jacket is accurately distributed in flow through the first electronic thermostat, so that the cooling strength is ensured.
Furthermore, the first electronic thermostat and the second electronic thermostat are connected in series and control the electronic water pump, so that the total flow in the cooling system can be accurately adjusted, and meanwhile, the flow of the cooling liquid entering the cylinder cover and the engine body water jacket can be accurately distributed, and the accurate regulation and control of the cooling strength required by the cooling system can be realized.
In the invention, the cooling liquid only flows through the cylinder cover water jacket and the integrated exhaust manifold cooling water jacket and does not flow through the engine body water jacket during cold start, thus not only ensuring the cooling strength required by the cylinder cover, but also effectively utilizing the heat emitted by the exhaust manifold, thereby rapidly improving the temperature of the cooling liquid in the cooling circulation system and the temperature of the cooling liquid retained in the engine body water jacket, and finally achieving the purpose of greatly shortening the cold start time. During the warming-up, the cooling liquid flows through the cylinder cover water jacket and the integrated exhaust manifold cooling water jacket, and simultaneously flows into the engine body water jacket through the communicating pipe in the vicinity of the inlet of the cylinder cover water jacket, and the flow of the engine body water jacket is independently controlled through the first electronic thermostat, so that during the warming-up process, the cooling strength of the cylinder cover can be ensured, meanwhile, the engine body can be prevented from being excessively cooled, and the warming-up process is accelerated by effectively utilizing the heat of the integrated exhaust manifold. When the engine is in normal operation, the MAP is controlled through the temperature of the first electronic thermostat, the second electronic thermostat and the temperature of the cooling liquid at the outlet of the cylinder cover, so that the flow of the cooling liquid entering the engine body water jacket and the cylinder cover water jacket is accurately regulated, the split cooling control effect of the engine body water jacket and the cylinder cover water jacket is realized, and the cooling strength required by the cylinder cover water jacket and the engine body water jacket is ensured. Under any working condition, the cooling liquid firstly flows into the cylinder cover water jacket and the integrated exhaust manifold cooling water jacket, and the cooling liquid does not flow through the engine body water jacket under the working condition of the cold engine, so that the cooling strength required by the cylinder cover is ensured, and the incorporated exhaust manifold cooling water jacket can accelerate the cold start and warm engine processes.
Drawings
FIG. 1 is a schematic diagram of the operation of the present invention in cold condition.
FIG. 2 is a schematic diagram of the operation of the cooling system during warm-up of the present invention.
FIG. 3 is a schematic diagram of the cooling system operating during normal engine operation of the present invention.
Wherein: 1-an electronic water pump; 2-cylinder cover water jacket; 3-exhaust manifold cooling jacket; 4-machine body water jacket; 5-a first electronic thermostat; 6-a radiator; 7-a second electronic thermostat; 8-an electronic fan; 9-a first motor; 10-a second motor; 11-a first temperature sensor; 12-a second temperature sensor; 13-third temperature sensor, 14-fourth temperature sensor.
Detailed Description
The technical solution of the present invention is further described in detail by the accompanying drawings and the embodiments.
In the invention, cooling liquid of the cooling system firstly flows into a water jacket of a cylinder cover of the engine, a communicating pipe is arranged at one cylinder of the engine after flowing into the water jacket of the cylinder cover, and flows into a water jacket 4 of an engine body through the communicating pipe, and the cylinder cover and the cylinder body are equivalently connected in parallel in the actual operation process.
The engine warming-up system is used for cooling the cylinder cover and the cylinder sleeve in a split mode and achieving intelligent control according to the requirements of different cooling strengths of the cylinder cover and the cylinder sleeve and the requirement of the engine warming-up process, and meanwhile the cylinder cover and the cylinder sleeve are integrated into an exhaust manifold cooling pipeline to accelerate the warming-up process.
Referring to fig. 1, 2 and 3, the intelligent cooling system of the present invention mainly includes an electronic water pump 1, a cylinder head water jacket 2, an integrated exhaust manifold cooling water jacket 3, a machine body water jacket 4, a first electronic thermostat 5, a radiator 6, a second electronic thermostat 7, an electronic fan 8, a plurality of temperature sensors, a first motor 9, a second motor 10 and an electronic control unit.
The plurality of temperature sensors comprise a first temperature sensor 11, a second temperature sensor 12 and a third temperature sensor 13, and the first temperature sensor 11, the second temperature sensor 12, the third temperature sensor 13 and a fourth temperature sensor 14 are all connected with the electronic control unit.
Referring to fig. 1, 2 and 3, an outlet of the electronic water pump 1 is divided into two paths, one path is connected with an inlet of a cylinder cover water jacket 2, the other path is connected with an inlet of an integrated exhaust manifold cooling water jacket 3, an outlet of the cylinder cover water jacket 2 and an outlet of the integrated exhaust manifold cooling water jacket 3 are converged and connected with a three-way inlet, the three-way outlet is divided into two paths, one path is connected with an inlet of a radiator 6, the other path is connected with an outlet of a first electronic thermostat 5, an outlet of the radiator 6 is connected with a first inlet of a second electronic thermostat 7, and an outlet of the first electronic thermostat 5 is connected with a second inlet of the second electronic thermostat 7 through a pipeline. An electronic fan 8 is arranged on one side of the radiator 6, and the electronic fan 8 is connected with a first motor 9. The outlet of the second electronic thermostat 7 is connected with the inlet of the electronic water pump 1. The electronic water pump 1 is connected with a second motor 10.
The cylinder cover water jacket 2 is also connected with the engine body water jacket 4.
An outlet of the electronic water pump 1 is arranged at the front ends of the cylinder cover water jacket 2 and the integrated exhaust manifold cooling water jacket 3, and an inlet of the electronic water pump 1 is arranged at an outlet end of the second electronic thermostat 7; the cylinder cover water jacket 2 is connected with the engine body water jacket 4 through a pipeline; the machine body water jacket 4 is connected with an inlet of a first electronic thermostat 5; an outlet of the cylinder cover water jacket 2 is connected with an outlet of the integrated exhaust manifold cooling water jacket 3, and the outlet of the cylinder cover water jacket 2 and the outlet of the integrated exhaust manifold cooling water jacket 3 are converged into a whole and then connected with an inlet of a radiator 6 and an outlet of a first electronic thermostat 5 through a tee; the second electronic thermostat 7 comprises a first inlet and a second inlet, the first inlet is connected with the outlet of the radiator 6, and the second inlet is connected with the outlet of the first electronic thermostat 5; the outlet of the second electronic thermostat 7 is connected with the inlet of the electronic water pump 1; the electronic fan 8 is arranged on one side of the radiator 6 and used for providing forced convection heat exchange for the radiator 6; the first motor 9 is connected with the electronic fan 8 and used for driving the electronic fan 8 to rotate, and the second motor 10 is connected with the electronic water pump 1 and used for driving the electronic water pump 1; a first temperature sensor 11 is installed at the inlet of the first electronic thermostat 5, a second temperature sensor 12 is installed at the junction of the outlet of the cylinder head water jacket 2 and the outlet of the integrated exhaust manifold cooling water jacket 3, and a third temperature sensor 13 is installed on a pipeline between the first electronic thermostat 5 and the second electronic thermostat 7. A fourth temperature sensor 14 is mounted on the conduit between the first inlet of the second electronic thermostat 7 and the outlet of the radiator 6.
Referring to fig. 1, whether the temperature of the coolant is lower than a preset value T is judged according to a temperature signal of a first temperature sensor 11, if the temperature of the coolant is lower than the preset value T under the working condition of the refrigerator, a second motor 10 drives an electronic water pump 1 to pump the coolant into a cylinder cover water jacket 2 and an integrated exhaust manifold cooling water jacket 3, the coolant then flows through a second electronic thermostat 7 in a converging manner and then flows into the electronic water pump 1 to form a cold start cooling small circulation, and at the moment, the coolant only flows through the cylinder cover water jacket 2 and the integrated exhaust manifold cooling water jacket 3.
Referring to fig. 2, under the warming-up condition, when the temperature of the coolant is higher than the preset value T but lower than the preset value Tc under the normal operation condition, the second motor 10 drives the electronic water pump 1 to pump the coolant into the cylinder head water jacket 2 and the integrated exhaust manifold cooling water jacket 3, part of the coolant in the cylinder head water jacket 2 flows into the engine body water jacket 4, then flows into the first electronic thermostat 5, then merges with the coolant in the water outlet pipes of the cylinder head water jacket 2 and the integrated exhaust manifold cooling water jacket 3, flows through the second electronic thermostat 7, and then flows into the electronic water pump 1, so as to form a small warming-up cooling cycle, and at this time, the first electronic thermostat 5 only controls the cooling strength of the engine body water jacket 4.
Referring to fig. 3, when the temperature of the coolant under the normal operation condition is greater than or equal to the preset value Tc of the temperature under the normal operation condition, the second motor 10 drives the electronic water pump 1 to pump the coolant into the cylinder head water jacket 2 and the integrated exhaust manifold cooling water jacket 3, a part of the coolant in the cylinder head water jacket 2 flows through the engine body water jacket 4, then flows through the first electronic thermostat 5, then joins with the cylinder head water jacket 2 and the integrated exhaust manifold cooling water jacket 3 through the water outlet pipe, flows through the radiator 6 for cooling, then flows into the second electronic thermostat 7, and finally flows into the electronic water pump 1, so as to form a cooling circulation. In the cooling system, a first electronic thermostat 5 of the machine body controls the cooling intensity of the machine body, and a second electronic thermostat 7, an electronic water pump 1 and an electronic fan 8 are controlled to control the cooling intensity of the whole cooling system.
Under any working condition, the cooling liquid firstly flows into the cylinder cover water jacket 2 and the integrated exhaust manifold cooling water jacket 3, and the cooling liquid does not flow through the engine body water jacket 4 under the working condition of the cold engine.
The integrated exhaust manifold cooling water jacket 3 is incorporated into the cooling system to accelerate the warm-up process.
The body water jacket 4 is connected with a first electronic thermostat 5, and the body water jacket 4 can be accurately distributed in flow through the first electronic thermostat 5.
The first electronic thermostat 5 is connected with the second electronic thermostat 7 in series, and the engine body water jacket 4 and the electronic water pump 1 are controlled to realize accurate regulation and control of cooling strength required by a cooling system.
The power of the first electric machine 9 and the second electric machine 10 can be adjusted according to the engine speed, the load and the temperature MAP, so that the consumed power is minimum under the condition that the required cooling intensity is met.
The invention also provides a control method of the intelligent cooling system of the engine;
in the working process of the engine cold machine, the temperature of the cooling liquid is lower than a preset value T, the cooling intensity required by the engine is lower, the temperature of the engine body water jacket 4 is lower than that of the cylinder cover water jacket 2, and the cooling liquid does not flow through the cylinder sleeve.
At this time, whether the temperature of the coolant is lower than a preset limit value T is judged according to a temperature signal of the temperature sensor 11, if the temperature of the coolant is lower than the preset limit value T, the first electronic thermostat 5 is turned off, the second motor 10 drives the electronic water pump 1 to pump the coolant into the cylinder head water jacket 2 and the integrated exhaust manifold cooling water jacket 3, then the coolant is converged into the second electronic thermostat 7, and finally the coolant flows into the electronic water pump 1, so that a small-cycle cooler is formed. The electronic control unit controls the opening of the second electronic thermostat 7 and adjusts the rotating speed of the electronic water pump 1 according to the operating condition (the rotating speed and the load of the engine) of the engine and the temperature signal collected by the third temperature sensor 13, so that the cooling intensity of the whole cooling loop is regulated and controlled, and the integrated exhaust manifold cooling water jacket 3 incorporated at the moment can accelerate the warming-up.
The warming-up working condition is similar to the cooling machine working condition, the cooling liquid is constantly heated by the cylinder cover and the exhaust manifold in the loop, the temperature of the cooling liquid is increased to a preset limit value T, but is lower than a preset temperature value Tc under the normal operation working condition, at the moment, whether the temperature of the cooling liquid is higher than the preset value T is judged according to the temperature signal of the first temperature sensor 11, if the temperature of the cooling liquid is higher than the preset value T, the first electronic thermostat 5 is started, whether the temperature of the cooling liquid is lower than the preset temperature value Tc under the normal operation working condition is judged according to the temperature signal of the third temperature sensor 13, if the temperature of the cooling liquid is lower than the preset temperature value Tc under the normal operation working condition, the first inlet of the second electronic thermostat 7 is closed, and the second inlet is kept opened. In the process, the opening degree of the inlet of the cylinder jacket 4 is adjusted through the first electronic thermostat 5, and the electronic control unit controls the opening degree of the first electronic thermostat 5 according to the running condition (the rotating speed and the load of the engine) of the engine and a temperature signal collected by the first temperature sensor 11, so that the flow of the cooling liquid entering the engine body water jacket 4 is controlled. Meanwhile, the electronic control unit controls the opening of the second inlet of the second electronic thermostat 7 and the rotation speed of the electronic water pump according to the operating condition of the engine (the rotation speed and the load of the engine) and the temperature signal acquired by the third temperature sensor 13, so as to regulate the flow of the cooling liquid entering the cylinder cover water jacket, the exhaust manifold cooling water jacket and the engine body water jacket.
The electronic control unit controls the opening degree of a second inlet of a second electronic thermostat 7 and the rotating speed of the electronic water pump 1 according to the operating condition (the rotating speed and the load of the engine) of the engine and the temperature signals collected by a third temperature sensor 13, so as to adjust the flow rate of the water jacket of the engine body, cooling liquid in the water jacket of the engine and the cylinder cover respectively cools the cylinder cover and the cylinder sleeve and then enters the second electronic thermostat 7, before the temperature of the cooling liquid reaches a preset temperature Tc, a first inlet of the second electronic thermostat 7 is still closed, the cooling liquid does not flow through a radiator 6, the cooling liquid passes through the electronic water pump 1 to form a small circulation loop, the cooling liquid is simultaneously heated by the cylinder cover, the cylinder sleeve and an exhaust manifold in the loop until the temperature of the cooling liquid rises to the preset temperature Tc, the first inlet of the second electronic thermostat 7 is opened, the second inlet is closed, the second electronic thermostat 7 is connected with the radiator 6, the cooling liquid enters the electronic water pump 1 after being radiated by the radiator 6, and the warming-up process is finished.
During normal operation of the engine (the temperature of the coolant is greater than or equal to the preset temperature value Tc under the normal operation condition), the second motor 10 drives the electronic water pump 1 to pump the coolant into the cylinder cover water jacket 2 and the integrated exhaust manifold cooling water jacket 3, and the electronic control unit adjusts the opening of the first electronic thermostat 5 according to the temperature signal of the first temperature sensor 11 to distribute the flow of the coolant entering the engine body water jacket 4. After cooling liquid flows through the cylinder cover water jacket 2 and the engine body water jacket 4, the cooling liquid in the engine body water jacket 4, the residual cooling liquid in the cylinder cover water jacket 2 and the cooling liquid of the integrated exhaust manifold cooling water jacket 3 are converged in the first electronic thermostat 5 and then flow into the radiator 6, the electronic fan 8 driven by the first motor 9 provides forced water-air convection heat exchange, after the temperature of the cooling liquid is reduced, the cooling liquid enters the water outlet pipe of the radiator to be connected with the second electronic thermostat 7 and then flows into the electronic water pump 1 to form a large circulation, and in the process, the electronic control unit adjusts the opening degree of the first electronic thermostat 5 according to a temperature signal of the first temperature sensor 11 and distributes the flow of the cooling liquid entering the engine body water jacket 4. Meanwhile, according to the temperature signals collected by the fourth temperature sensor 14 and the second temperature sensor 12 and the cylinder head outlet cooling temperature MAP, the opening degree of the first inlet of the second electronic thermostat 7, the rotating speeds of the first motor 9 and the second motor 10 are adjusted, so that the rotating speeds of the electronic fan 8 and the electronic water pump 1 are controlled, the cooling intensity of the whole cooling system is adjusted, and meanwhile, the cylinder head water jacket outlet cooling temperature is monitored through the temperature signals of the first temperature sensor 12 to keep the same with the cylinder head outlet cooling temperature MAP temperature result.
In the working process of the system, the electronic water pump 1 pumps cooling liquid into the cylinder cover water jacket 2 and the exhaust manifold cooling water jacket 3 for cooling, the first electronic thermostat 5 adjusts the amount of the cooling liquid entering the engine body water jacket from the cylinder cover water jacket according to a temperature signal transmitted by the temperature sensor 11 and an engine working condition signal, the cooling liquid does not pass through a radiator under the working conditions of a cold machine and a warm machine, and the first electronic thermostat 5 and the second electronic thermostat 7 are connected in series to form a small cycle. When the engine is in normal operation, the residual cooling liquid of the water jacket of the cylinder cover is converged with the cooling liquid of the exhaust manifold, then converged with the water outlet pipe of the first electronic thermostat 5 and flows into the radiator 6, the electronic fan 8 driven by the first motor 9 provides forced water-air convection heat exchange for the engine, and the water outlet pipe of the radiator is connected with the second electronic thermostat 7 to form a large circulation. The invention can automatically adjust and control the temperature and the flow of the cooling liquid through the double electronic thermostat, and simultaneously, the double electronic thermostat is combined with the exhaust manifold cooling pipe, thereby accelerating the warming-up process of the engine, ensuring that the engine works in the optimal temperature state, reducing the fuel consumption and the accessory loss and improving the economy of the engine.
According to the invention, the temperature MAP of the cooling liquid at the outlet of the cylinder cover along with the change of the rotating speed and the load is obtained through an engine bench calibration experiment.
The temperature of the cooling liquid is controlled according to the engine speed load interval, when the engine speed and the load are lower, the temperature of the cooling liquid is adjusted to keep the engine working at a higher temperature, the working viscosity of engine oil is reduced, and the consumed power, the friction loss and the heat transfer loss of accessories of an engine cooling system are reduced to the minimum, so that the effective thermal efficiency of the engine is improved to the maximum extent.
When the engine load and the engine speed are higher, the temperature of the cooling liquid is adjusted to keep the engine working at a lower temperature, the ignition margin limited by the knocking is controlled and improved, the consumed power, the friction loss and the heat transfer loss of accessories are balanced, and the indication thermal efficiency under the optimal ignition advance angle is optimized, so that the optimization of the effective thermal efficiency of the engine is ensured.
Claims (8)
1. An intelligent cooling system based on engine split cooling is characterized by comprising an electronic water pump (1), a cylinder cover water jacket (2), an integrated exhaust manifold cooling water jacket (3), a machine body water jacket (4), a first electronic thermostat (5), a radiator (6), a second electronic thermostat (7), a plurality of temperature sensors and an electronic control unit;
the temperature sensors are connected with the electronic control unit;
the outlet of the electronic water pump (1) is divided into two paths, one path is connected with the inlet of a cylinder cover water jacket (2), the other path is connected with the inlet of an integrated exhaust manifold cooling water jacket (3), the outlet of the cylinder cover water jacket (2) is converged with the outlet of the integrated exhaust manifold cooling water jacket (3) and is connected with a three-way inlet, the three-way outlet is divided into two paths, one path is connected with the inlet of a radiator (6), the other path is connected with the outlet of a first electronic thermostat (5), the outlet of the radiator (6) is connected with a first inlet of a second electronic thermostat (7), and the outlet of the first electronic thermostat (5) is connected with a second inlet of the second electronic thermostat (7); the outlet of the second electronic thermostat (7) is connected with the inlet of the electronic water pump (1);
the cylinder cover water jacket (2) is also connected with an inlet of the engine body water jacket (4), and an outlet of the engine body water jacket (4) is connected with an inlet of the first electronic thermostat (5); the second electronic thermostat (7) comprises a first inlet and a second inlet, the first inlet is connected with the outlet of the radiator (6), and the second inlet is connected with the outlet of the first electronic thermostat (5); the outlet of the second electronic thermostat (7) is connected with the inlet of the electronic water pump (1).
2. The intelligent cooling system based on engine split cooling is characterized in that the temperature sensors comprise a first temperature sensor (11), a second temperature sensor (12), a third temperature sensor (13) and a fourth temperature sensor (14), and the first temperature sensor (11), the second temperature sensor (12), the third temperature sensor (13) and the fourth temperature sensor (14) are all connected with an electronic control unit.
3. The intelligent cooling system based on engine split cooling is characterized in that a first temperature sensor (11) is installed at the inlet of a first electronic thermostat (5), a second temperature sensor (12) is installed at the junction of the outlet of a cylinder head water jacket (2) and the outlet of an integrated exhaust manifold cooling water jacket (3), a third temperature sensor (13) is installed on a pipeline between the first electronic thermostat (5) and a second electronic thermostat (7), and a fourth temperature sensor (14) is installed between the first inlet of the second electronic thermostat (7) and the outlet of a radiator (6).
4. The intelligent cooling system based on engine split cooling is characterized in that an electronic fan (8) is arranged on one side of the radiator (6).
5. The intelligent cooling system based on engine split cooling of claim 1, characterized in that the electronic fan (8) is connected with a first electric machine (9).
6. The intelligent cooling system based on engine split cooling according to claim 1, characterized in that the electronic water pump (1) is connected with a second motor (10).
7. The intelligent cooling system based on engine split cooling of claim 1,
under the working condition of the cold machine, when the temperature of the cooling liquid is lower than a preset value T, the first electronic thermostat (5) is closed, the cooling liquid is pumped into the cylinder cover water jacket (2) and the integrated exhaust manifold cooling water jacket (3), and the cooling liquid in the cylinder cover water jacket (2) and the integrated exhaust manifold cooling water jacket (3) is converged, passes through the second electronic thermostat (7) and then flows into the electronic water pump (1);
under the warm-up working condition, when the temperature of the cooling liquid is higher than a preset value T and lower than a preset temperature Tc under the normal operation working condition, the cooling liquid is pumped into a cylinder cover water jacket (2) and an integrated exhaust manifold cooling water jacket (3), part of the cooling liquid in the cylinder cover water jacket (2) flows into a machine body water jacket (4), then flows into a first electronic thermostat (5), then is converged with outlets of the cylinder cover water jacket (2) and the integrated exhaust manifold cooling water jacket (3), then flows through a second electronic thermostat (7), and then flows into an electronic water pump (1);
under the normal operation working condition, when the temperature of the cooling liquid is greater than or equal to the preset value Tc of the temperature of the normal operation working condition, the cooling liquid is pumped into the cylinder cover water jacket (2) and the integrated exhaust manifold cooling water jacket (3), part of the cooling liquid in the cylinder cover water jacket (2) flows through the engine body water jacket (4), then flows through the first electronic thermostat (5), then is converged with the cylinder cover water jacket (2) and the outlet of the integrated exhaust manifold cooling water jacket (3), flows through the radiator (6) for cooling, then flows through the second electronic thermostat (7), and finally flows into the electronic water pump (1).
8. A control method of an intelligent cooling system based on engine split cooling according to claim 2,
when the refrigerator is in a working condition, the electronic control unit judges whether the temperature of the cooling liquid is lower than a preset value T according to a temperature signal of the first temperature sensor (11), if the temperature of the cooling liquid is lower than the preset value T, the first electronic thermostat (5) is closed, the cooling liquid is pumped into the cylinder cover water jacket (2) and the integrated exhaust manifold cooling water jacket (3), then the cooling liquid is converged into the second electronic thermostat (7), and finally the cooling liquid flows into the electronic water pump (1) to form the circulation of the refrigerator; the electronic control unit controls the opening of the second electronic thermostat (7) and adjusts the rotating speed of the electronic water pump (1) according to the operating condition of the engine and the temperature signal acquired by the third temperature sensor (13);
under the warming-up condition, when the temperature of the cooling liquid rises to a preset limit value T and is lower than a preset temperature value Tc under the normal operation condition, the electronic control unit judges whether the temperature of the cooling liquid is higher than the preset value T according to a temperature signal of the first temperature sensor (11), if the temperature of the cooling liquid is higher than the preset value T, the first electronic thermostat (5) is started, and judges whether the temperature of the cooling liquid is lower than the preset temperature value Tc under the normal operation condition according to a temperature signal of the third temperature sensor (13), if the temperature of the cooling liquid is lower than the preset temperature value Tc under the normal operation condition, the first inlet of the second electronic thermostat (7) is closed, and the second inlet is opened; the electronic control unit controls the opening of the first electronic thermostat (5) according to the operating condition of an engine and the temperature signal of the first temperature sensor (11) so as to control the flow of cooling liquid entering the engine body water jacket (4), and controls the opening of a second inlet of the second electronic thermostat (7) and the rotating speed of the electronic water pump (1) according to the operating condition of the engine and the temperature signal of the third temperature sensor (13) so as to regulate the flow of the cooling liquid entering the cylinder cover water jacket, the exhaust manifold cooling water jacket and the engine body water jacket; the cooling liquid is heated by the cylinder cover, the cylinder sleeve and the exhaust manifold, when the temperature of the cooling liquid rises to a preset temperature Tc, a first inlet of a second electronic thermostat (7) is opened, then the cooling liquid is cooled by a radiator (6) and enters an electronic water pump (1), and the warming-up process is finished;
when the engine normally works, the electronic control unit judges whether the temperature of the cooling liquid is greater than or equal to a preset value of the temperature of a normal operation working condition according to a temperature signal of the second temperature sensor (12), if the temperature of the cooling liquid is greater than or equal to the preset value of the temperature of the normal operation working condition, the first electronic thermostat (5) is opened, the first inlet of the second electronic thermostat (7) is opened, the second inlet of the second electronic thermostat (7) is closed, the cooling liquid is pumped into the cylinder cover water jacket (2) and the integrated exhaust manifold cooling water jacket (3), the electronic control unit regulates the opening of the first electronic thermostat (5) according to the temperature signals of the cylinder cover outlet cooling liquid temperature MAP, the first temperature sensor (11), the second temperature sensor (12) and the fourth temperature sensor (14), distributes the flow of the cooling liquid entering the engine body water jacket (4), and controls the opening of the first inlet of the second electronic thermostat (7) and the rotating speed of the electronic water pump (1), adjusting the total coolant flow in the system; after the cooling liquid flows through the cylinder cover water jacket (2) and the engine body water jacket (4), the cooling liquid in the engine body water jacket (4), the residual cooling liquid in the cylinder cover water jacket (2) and the cooling liquid in the integrated exhaust manifold cooling water jacket (3) are intersected with the first electronic thermostat (5) and then flow into the radiator (6), and after the temperature of the cooling liquid is reduced, the cooling liquid flows into the electronic water pump (1) through the second electronic thermostat (7) to form circulation.
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Application publication date: 20211102 |