CN111005799B - Water temperature control method and device, thermal management system and storage medium - Google Patents

Water temperature control method and device, thermal management system and storage medium Download PDF

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CN111005799B
CN111005799B CN201911168568.3A CN201911168568A CN111005799B CN 111005799 B CN111005799 B CN 111005799B CN 201911168568 A CN201911168568 A CN 201911168568A CN 111005799 B CN111005799 B CN 111005799B
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water temperature
temperature
diesel engine
control variable
water
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CN111005799A (en
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周鹏
张建锐
杨荣彬
佀庆涛
李子竞
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FAW Jiefang Automotive Co Ltd
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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
    • 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
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • 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
    • 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
    • F01P2007/143—Controlling of coolant flow the coolant being liquid using restrictions

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  • 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 discloses a water temperature control method and device, a whole vehicle thermal management system and a storage medium. The water temperature control method comprises the following steps: monitoring the water temperature of a diesel engine, and judging whether the water temperature is higher than a set temperature threshold value; if so, acquiring a target temperature and a pre-established state space equation of the water temperature of the diesel engine; determining a control variable of the water temperature according to the target temperature and a state space equation, wherein the control variable comprises a fan rotating speed, an electric control water pump rotating speed and a thermostat opening; and controlling the water temperature of the diesel engine according to the control variable. According to the technical scheme of the embodiment of the invention, the water temperature is monitored in real time, the state space equation of the water temperature is established, the corresponding relation between the water temperature and each control variable is determined, and the value of the control variable reaching the target temperature is determined according to the corresponding relation, so that the value of each control variable is optimized on line, the accuracy of water temperature control is improved, and the energy consumption of a system is reduced.

Description

Water temperature control method and device, thermal management system and storage medium
Technical Field
The embodiment of the invention relates to the technical field of temperature control, in particular to a water temperature control method, a water temperature control device, a thermal management system and a storage medium.
Background
As the running time of the automobile diesel engine increases, the temperature of the automobile diesel engine also increases, and when the temperature exceeds the working range, the power consumption of the engine is increased, and the service life of related components is reduced. Therefore, temperature control is critical for diesel engines.
Traditional diesel engine temperature control mainly relies on wax formula thermostat to carry out the regulation of big or small circulation, and its aperture that only can control thermostat can't control the rotational speed of water pump and fan, and controllable parameter is few, and the regulating effect is not good, can't realize accurate temperature regulation and control.
Disclosure of Invention
The invention provides a water temperature control method, a water temperature control device, a heat management system and a storage medium, and aims to realize accurate and real-time control of water temperature of a diesel engine.
In a first aspect, an embodiment of the present invention provides a method for controlling a water temperature, where the method includes:
monitoring the water temperature of a diesel engine, and judging whether the water temperature is higher than a set temperature threshold value;
if so, acquiring a target temperature and a pre-established state space equation of the water temperature of the diesel engine;
determining a control variable of the water temperature according to the target temperature and the state space equation, wherein the control variable comprises a fan rotating speed control variable, an electric control water pump rotating speed control variable and a thermostat opening degree control variable;
and controlling the water temperature of the diesel engine according to the control variable.
In a second aspect, an embodiment of the present invention further provides a device for controlling water temperature, including:
the water temperature monitoring module is used for monitoring the water temperature of the diesel engine and judging whether the water temperature is higher than a set temperature threshold value;
the preprocessing module is used for acquiring a target temperature and a pre-established state space equation of the water temperature of the diesel engine if the water temperature is higher than a set temperature threshold;
the control variable determining module is used for determining a control variable of the water temperature according to the target temperature and the state space equation, wherein the control variable comprises a fan rotating speed control variable, an electric control water pump rotating speed control variable and a thermostat opening degree control variable;
and the water temperature control module is used for controlling the water temperature of the diesel engine according to the control variable.
In a third aspect, an embodiment of the present invention further provides a finished automobile thermal management system, where the finished automobile thermal management system includes: the water temperature control system comprises a diesel engine, an intelligent fan, an electric control water pump, a controllable thermostat and a water temperature controller, wherein the water temperature controller is used for executing the water temperature control method provided by any embodiment of the invention.
In a fourth aspect, embodiments of the present invention also provide a storage medium containing computer-executable instructions which, when executed by a computer processor, are used to perform a method of controlling water temperature as provided by any of the embodiments of the present invention.
According to the technical scheme of the embodiment of the invention, when the water temperature of the diesel engine is higher than a set value, the control variables of the fan rotating speed, the water pump rotating speed and the thermostat opening degree are determined through the water temperature state space equation pre-established by the target temperature, and the water temperature is controlled based on the three control variables, so that the system has the advantages of more controllable parameters, flexible control and high water temperature control precision, reduces the energy consumption of the system, reduces the loss of related parts, and prolongs the service life of the system.
Drawings
FIG. 1 is a flow chart of a method for controlling water temperature according to one embodiment of the present invention;
FIG. 2 is a flow chart of a method for controlling water temperature according to a second embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a water temperature control device according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of a finished automobile thermal management system in a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures associated with the present invention are shown in the drawings, not all of them.
Example one
Fig. 1 is a flowchart of a method for controlling water temperature according to an embodiment of the present invention, where the embodiment is applicable to a case of controlling water temperature of a diesel engine of a vehicle, and the method may be executed by a control device for water temperature or a thermal management system of the entire vehicle, as shown in fig. 1, the method includes:
and step 110, monitoring the water temperature of the diesel engine, and judging whether the water temperature is higher than a set temperature threshold value.
The diesel engine or the diesel engine can be an embedded system diesel engine. The water temperature may be the temperature of the water at the outlet of the diesel engine. The set temperature threshold may be determined based on the performance of the diesel engine, or may be determined empirically. When the water temperature is lower than the set temperature threshold, the diesel engine is in a heat engine mode, namely in a stage of water temperature rising, which indicates that the water temperature is lower than the working temperature of the diesel engine at the moment. The set temperature threshold may be 70 deg.C, 75 deg.C, or other values.
And 120, if so, acquiring a target temperature and a pre-established state space equation of the water temperature of the diesel engine.
Specifically, if the current water temperature of the diesel engine is higher than a set temperature threshold, a state space equation of a target temperature and a pre-established water temperature of the diesel engine is obtained.
The target temperature refers to the ideal working temperature of the diesel engine and can be obtained through multiple tests or determined according to the performance of the heat management system of the whole vehicle. The target temperature may be 80 ℃, 85 ℃ or other values.
Alternatively, the target temperature may be determined by: establishing a first corresponding relation among water temperature, energy consumption and heat efficiency; and determining the target temperature of the diesel engine according to the first corresponding relation by taking the lowest oil consumption as a target.
Specifically, the target temperature may be determined by bench testing. The target temperature is determined by comprehensively considering the energy consumption caused by the frictional resistance caused by the water temperature, the difference of the thermal efficiency caused by the difference of the factors such as the charging efficiency caused by different water temperatures, the heat transfer in the cylinder and the like, and considering the target of lowest oil consumption. The target temperature may range from 75 ℃ to 90 ℃.
The state space equation is an equation representing the relation between the water temperature of the diesel engine and each control parameter.
Optionally, the state variables of the state space equation include an engine inlet temperature, a body metal temperature and a large circulation flow rate, the input variables are a fan rotation speed, an electric control water pump rotation speed and a thermostat opening degree, and the output variable is an engine outlet temperature.
Because the water temperature at the outlet of the diesel engine is related to a plurality of parameters, such as large circulation flow mexchSmall circulation flow and cylinder head temperature TmetalAnd the inlet air temperature T of the intercoolercoolinAnd the outlet temperature T of the intercoolercooloutCabin temperature TcabinEngine inlet temperature Tmot1Fan speed nfanAnd the rotation speed n of the electric control water pumppumbThermostat opening thetathAnd the ambient temperature TambThe equation has a relation with the heat transfer and the heat dissipation, the establishment of a state space equation can be established according to the physical processes related to the water temperature, such as heat transfer and heat dissipation, and finally the water temperature at the outlet of the diesel engine and the fan rotating speed n can be established through the state space equationfanAnd the rotation speed n of the electric control water pumppumbAnd thermostat opening thetathThe relationship between them.
And step 130, determining a control variable of the water temperature according to the target temperature and the state space equation, wherein the control variable comprises a fan rotating speed, an electric control water pump rotating speed and a thermostat opening degree.
Specifically, the corresponding relation between the water temperature and each control variable can be obtained through a state space equation, and the final value of each control variable can be obtained according to the target water temperature.
Specifically, since the water temperature is determined by a plurality of control parameters, the optimal solution can be found by setting a cost function.
Optionally, determining the control variable of the water temperature according to the target temperature and the state space equation includes:
determining a second corresponding relation between the water temperature of the diesel engine and the control variable according to the state space equation; and determining a control variable of the water temperature according to each second corresponding relation, the target temperature and the first cost function.
The state space equation describes the corresponding relationship between each state at the previous moment, the input value and each state value at the current moment, so that the corresponding relationship between the water temperature at the next moment and each control variable, namely the second corresponding relationship, can be obtained through the state space equation. In order to obtain an optimal solution, a plurality of second corresponding relations can be obtained in a recursion mode, and then the optimal solution of each control variable is obtained by combining the target temperature and the first cost function.
In particular, the goal of the first cost function should be to have a temperature as close as possible to the target temperature, while also minimizing system losses.
Optionally, the expression of the first cost function may be:
Figure BDA0002288103240000061
wherein, FlAs a cost function, fiA second corresponding relation, T, corresponding to the ith predicted temperatureoIs the target temperature, alpha is the weight coefficient, gipumpEnergy consumption g of the electrically controlled water pump corresponding to the ith predicted temperatureifanAnd the energy consumption of the fan corresponding to the ith predicted temperature.
And 140, controlling the water temperature of the diesel engine according to the control variable.
According to the technical scheme of the embodiment of the invention, when the water temperature of the diesel engine is higher than a set value, the control variables of the fan rotating speed, the water pump rotating speed and the thermostat opening degree are determined through the water temperature state space equation pre-established by the target temperature, and the water temperature is controlled based on the three control variables, so that the system has the advantages of more controllable parameters, flexible control and high water temperature control precision, reduces the energy consumption of the system, reduces the loss of related parts, and prolongs the service life of the system.
Example two
Fig. 2 is a flowchart of a water temperature control method according to a second embodiment of the present invention, which is further detailed and supplemented based on the first embodiment, and the water temperature control method according to the second embodiment of the present invention further includes: and linearizing and discretizing the state space equation.
As shown in fig. 2, the clock synchronization method for a vehicle according to the present embodiment includes:
step 210, determining a set temperature threshold and a target temperature of the diesel engine.
And step 220, monitoring the water temperature of the diesel engine.
And step 230, establishing a state space equation of the water temperature of the diesel engine.
The state variables of the state space equation comprise the engine outlet temperature, the engine inlet temperature, the body metal temperature and the large circulation flow of the diesel engine, and the input variables are the fan rotating speed, the rotating speed of the electric control water pump and the opening degree of the thermostat.
Specifically, when the state space equation of the water temperature can be established through a bench test, the method is mainly carried out according to the following equation set:
Figure BDA0002288103240000071
Figure BDA0002288103240000072
Figure BDA0002288103240000073
Figure BDA0002288103240000074
Qcom＝fc(nmot,Tmot,Trq)
hpc×Apc＝f1(mexch,mcabin)
Figure BDA0002288103240000075
Figure BDA0002288103240000076
hpe×Ape＝f3(θth,npump)
hcabin×Acabin＝f4(nfan,vvev)
Figure BDA0002288103240000077
Figure BDA0002288103240000078
Figure BDA0002288103240000079
wherein, TmotThe water temperature is the water temperature at the outlet of the diesel engine; t ismot1The water temperature of the inlet of the diesel engine; t ismetalIs the cylinder head temperature; t iscoolinThe intercooler inlet temperature; t iscooloutThe intercooler outlet temperature; t iscabinIs the cabin temperature; t isabmAmbient temperature, a known parameter; cv is the constant volume specific heat capacity of the cooling water and is a known parameter; cvmetalThe specific heat capacity of the metal of the engine is a known parameter; cvairThe specific heat capacity of air is a known parameter; a. thepeIs the water jacket surface area, is a known parameter; a. thepcThe surface area of the heat exchange surface of the radiator; a. thecabinThe surface area of the contact surface of the engine in the engine room and the cooling air is a known parameter; h ispcHeat transfer coefficient of the radiator; h ispeThe heat exchange coefficient between the water jacket and the engine body is adopted; q is the heat exchange quantity of the large and small circulation; qcomIs the engine heat; m isscoolThe total mass of cooling water in the small circulation; m islcoolThe total mass of cooling water in the large circulation; m ismetalThe mass of the metal of the engine body and the water jacket; m iscabinIs the air flow in the engine compartment; m isexchMass flow rate of cooling water flowing into the large circulation; n ismotIs the engine speed; v. ofvevVehicle speed is a known parameter; n ispumpThe rotating speed of the electric control water pump is controlled; n isfanThe rotating speed of the fan can be controlled; thetathThe opening degree of the thermostat is set; t isrqIs the engine torque, is a known parameter.
Wherein, the rotation speed n of the electric control water pumppumpControllable fan speed nfanAnd thermostat opening thetathIs an input variable; water temperature T of diesel engine inletmot1Engine outlet water temperature TmotCylinder head temperature TmetalIs a state variable; water temperature T of diesel engine outletmotIs the output variable of the state space equation.
Next, the parameters of the equation set need to be calibrated according to the overall vehicle thermal management system and the water temperature monitored in real time:
1) according to the monitored flow m into the large circulationexchCalibration f2And then the circulating heat exchange quantity Q can be determined;
2) at thermal equilibrium hpe×(Tmetal-Tmot)×ApeQ, and f may be calibrated3At the same time, hpc×(Tmot1-Tcoolin)×ApcQ, according to mexchCan calibrate f1；
3) Heat quantity Q of enginecomCan be obtained by calculating the total heat release through the heat value of the fuel oil, thereby calibrating fc；
4) By Qcom-Q＝hcabin×AcabinCan calibrate f4；
5) Calibration f by the relationship between cabin air flow, fan speed and vehicle speed at thermal equilibrium5；
6) Mass m of large and small circulating waterlcoolAnd mscoolCalculating according to the structure; mass m of metalmetalAnd (4) calibrating by transient test.
Further, the equation of state space can be calibrated by averaging in multiple tests in order to obtain more accurate equation of state space.
And 240, linearizing and discretizing the state space equation.
For the convenience of calculation, the complex state space equation is linearized into a linear state space equation for subsequent solution.
Specifically, the linearization may be performed through taylor expansion of a multivariate function, and the discretization may be performed according to an euler method or an improved euler method, or may be performed by using other algorithms, which is not limited in the present invention.
Further, t can be obtained by the equation of state space1Water temperature T of the engine outlet at the moment1With respective input variable and t0At the moment of the water temperature T of the engine outlet0The relationship between them. Then t may be1Water temperature T of the engine outlet at the moment1Inputting the state space equation to obtain t2Water temperature T of the engine outlet at the moment2Step by step recursion can obtain t3Water temperature T of the engine outlet at the moment3Finally, a preset number of water temperatures at the engine outlet at future times may be determined, wherein the preset number may be 5.
Further, the state space equation may be modified according to the actually monitored water temperature and the predicted water temperature of the output of the state space equation to improve the accuracy of the state space equation.
And step 250, establishing a corresponding relation between the rotating speed of the electric control water pump and the heat transfer coefficient when the diesel engine is in small circulation.
The small circulation refers to a process that when the water temperature is lower than a set temperature threshold value, the thermostat is in a closed state, and after the cooling liquid flows out of the engine body, the cooling liquid enters the electric control water pump and then enters the water jacket to cool the engine.
Step 260, determining a first cost function and a second cost function.
The first cost function is a corresponding cost function when the water temperature is higher than a set temperature threshold, and the second cost function is a cost function when the water temperature is lower than the set temperature threshold. The respective cost function may take any form, which is not a limitation of the present invention.
And 270, judging whether the water temperature is higher than the set temperature threshold value. If so, go to step 271, otherwise go to step 272.
When the water temperature is lower than the set temperature threshold, the engine is in a heat engine mode, the thermostat is in a closed state, and only the small circulation water path works; and when the water temperature is higher than the set temperature threshold value, the control target is changed to maintain the water temperature as the target temperature, the thermostat is in an open state at the moment, and the large and small circulating water paths start to work.
Step 271, determining a second corresponding relation between the water temperature of the diesel engine and the control variable according to the state space equation; and determining a control variable of the water temperature according to each second corresponding relation, the target temperature and the first cost function.
272, determining the rotating speed of the electric control water pump according to the corresponding relation between the rotating speed and the heat transfer coefficient of the electric control water pump and the second cost function; and controlling the water temperature of the diesel engine according to the rotating speed of the electric control water pump.
According to the technical scheme of the embodiment of the invention, when the water temperature of the diesel engine is higher than a set value, the control variables of the fan rotating speed, the water pump rotating speed and the opening degree of the thermostat are determined through a water temperature state space equation pre-established by the target temperature, and a cost function is set, so that the water temperature is as close as possible to the target temperature, and meanwhile, the energy consumption of the system is ensured to be minimum, thereby obtaining the optimal solution of the control variables; the water temperature control is carried out based on three control variables, so that the controllable parameters are more, the control is flexible, the water temperature control precision is high, the energy consumption of the system is reduced, the loss of related parts is reduced, and the service life of the system is prolonged; meanwhile, when the water temperature is smaller than a set value, the rotating speed of the electric control water pump is determined according to the corresponding relation, so that the small circulation process is controlled, and the energy consumption is reduced. The water temperature control method provided by the embodiment of the invention realizes the linear optimization of the values of all control variables, improves the precision of water temperature control and reduces the energy consumption of the system.
EXAMPLE III
Fig. 3 is a schematic structural diagram of a water temperature control device according to a third embodiment of the present invention, and as shown in fig. 3, the water temperature control device includes: a water temperature monitoring module 310, a pre-processing module 320, a control variable determination module 330, and a water temperature control module 340.
The water temperature monitoring module 310 is configured to monitor water temperature of the diesel engine and determine whether the water temperature is higher than a set temperature threshold; the preprocessing module 320 is used for acquiring a target temperature and a pre-established state space equation of the water temperature of the diesel engine if the water temperature is higher than a set temperature threshold; a control variable determining module 330, configured to determine a control variable of the water temperature according to the target temperature and the state space equation, where the control variable includes a fan rotation speed control variable, an electric control water pump rotation speed control variable, and a thermostat opening degree control variable; and the water temperature control module 340 is used for controlling the water temperature of the diesel engine according to the control variable.
According to the technical scheme of the embodiment of the invention, when the water temperature of the diesel engine is higher than a set value, the control variables of the fan rotating speed, the water pump rotating speed and the thermostat opening degree are determined through the water temperature state space equation pre-established by the target temperature, and the water temperature is controlled based on the three control variables, so that the system has the advantages of more controllable parameters, flexible control and high water temperature control precision, reduces the energy consumption of the system, reduces the loss of related parts, and prolongs the service life of the system.
Optionally, the water temperature control device further includes:
the target temperature determining module is used for establishing a first corresponding relation among water temperature, energy consumption and heat efficiency; determining a target temperature of the diesel engine according to the first corresponding relation by taking the lowest oil consumption as a target; and if the water temperature is higher than the set temperature threshold value.
The state variables of the state space equation comprise engine inlet temperature, body metal temperature and large circulation flow, the input variables are fan rotating speed, electric control water pump rotating speed and thermostat opening, and the output variables are engine outlet temperature.
Optionally, the water temperature control device further includes:
and the equation processing module is used for linearizing and discretizing the state space equation.
Optionally, the control variable determining module 330 is specifically configured to:
determining a first cost function for the water temperature; determining a second corresponding relation between the water temperature of the diesel engine and the control variable according to the state space equation; and determining a control variable of the water temperature according to each second corresponding relation, the target temperature and the first cost function.
Wherein the expression of the first cost function is:
Figure BDA0002288103240000121
wherein, FlAs a cost function, fiA second corresponding relation, T, corresponding to the ith predicted temperatureoIs the target temperature, alpha is the weight coefficient, gipumpEnergy consumption g of the electrically controlled water pump corresponding to the ith predicted temperatureifanAnd the energy consumption of the fan corresponding to the ith predicted temperature.
Optionally, the water temperature control module 340 is further configured to:
if the water temperature is lower than the set temperature threshold, determining a control variable of the rotating speed of the electric control water pump according to a pre-established corresponding relation between the rotating speed and the heat transfer coefficient of the electric control water pump and a second cost function; and controlling the water temperature of the diesel engine according to the control variable of the rotating speed of the electric control water pump.
The clock synchronization device of the vehicle provided by the embodiment of the invention can execute the clock synchronization method of the vehicle provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
Example four
Fig. 4 is a schematic structural diagram of a finished automobile thermal management system in a fourth embodiment of the present invention, and as shown in fig. 4, the finished automobile thermal management system includes: diesel engine 410, smart fan 420, electronically controlled water pump 430, controllable thermostat 440, and water temperature controller 450.
Wherein 410 is used for burning fuel to increase energy required for vehicle forward, the smart fan 420, the electrically controlled water pump 430, the controllable thermostat 440 and the water temperature controller 450 form a cooling system of the diesel engine 410, and the water temperature controller 450 is used for executing the water temperature control method provided by any embodiment of the invention.
EXAMPLE five
An embodiment of the present invention further provides a storage medium containing computer-executable instructions, which when executed by a computer processor, perform a method of controlling water temperature, the method comprising:
monitoring the water temperature of a diesel engine, and judging whether the water temperature is higher than a set temperature threshold value;
if so, acquiring a target temperature and a pre-established state space equation of the water temperature of the diesel engine;
determining a control variable of the water temperature according to the target temperature and a state space equation, wherein the control variable comprises a fan rotating speed, an electric control water pump rotating speed and a thermostat opening;
and controlling the water temperature of the diesel engine according to the control variable.
Of course, the storage medium provided by the embodiment of the present invention contains computer-executable instructions, and the computer-executable instructions are not limited to the method operations described above, and may also perform related operations in the method for controlling water temperature provided by any embodiment of the present invention.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
It should be noted that, in the embodiment of the water temperature control device, the units and modules included in the embodiment are only divided according to the functional logic, but are not limited to the above division, as long as the corresponding functions can be realized; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (9)

1. A method of controlling water temperature, comprising:
monitoring the water temperature of a diesel engine, and judging whether the water temperature is higher than a set temperature threshold value;
if so, acquiring a target temperature and a pre-established state space equation of the water temperature of the diesel engine;
the acquiring of the target temperature includes:
establishing a first corresponding relation among water temperature, energy consumption and heat efficiency;
determining a target temperature of the diesel engine according to the first corresponding relation by taking the lowest oil consumption as a target;
determining a control variable of the water temperature according to the target temperature and a state space equation, wherein the control variable comprises a fan rotating speed, an electric control water pump rotating speed and a thermostat opening;
and controlling the water temperature of the diesel engine according to the control variable.
2. The method of claim 1, wherein the state variables of the state space equation include engine inlet temperature, bulk metal temperature, and mass circulation flow, the input variables are fan speed, electronically controlled water pump speed, and thermostat opening, and the output variables are engine outlet temperature.
3. The method of claim 1, after obtaining the pre-established state space equation for water temperature of the diesel engine, further comprising:
and linearizing and discretizing the state space equation.
4. The method of claim 1, wherein determining a control variable for the water temperature from the target temperature and a state space equation comprises:
determining a first cost function for the water temperature;
determining a second corresponding relation between the water temperature of the diesel engine and the control variable according to the state space equation;
and determining a control variable of the water temperature according to each second corresponding relation, the target temperature and the first cost function.
5. The method of claim 4, wherein the first cost function is expressed by:
Figure FDA0002727400980000021
wherein, FlAs a cost function, fiA second corresponding relation, T, corresponding to the ith predicted temperatureoIs the target temperature, alpha is the weight coefficient, gipumpEnergy consumption g of the electrically controlled water pump corresponding to the ith predicted temperatureifanAnd the energy consumption of the fan corresponding to the ith predicted temperature.
6. The method of claim 1, further comprising:
if the water temperature is lower than the set temperature threshold, determining a control variable of the rotating speed of the electric control water pump according to a pre-established corresponding relation between the rotating speed and the heat transfer coefficient of the electric control water pump and a second cost function;
and controlling the water temperature of the diesel engine according to the control variable of the rotating speed of the electric control water pump.
7. A control device for water temperature, comprising:
the water temperature monitoring module is used for monitoring the water temperature of the diesel engine and judging whether the water temperature is higher than a set temperature threshold value;
the preprocessing module is used for acquiring a target temperature and a pre-established state space equation of the water temperature of the diesel engine if the water temperature is higher than a set temperature threshold;
the target temperature determining module is used for establishing a first corresponding relation among water temperature, energy consumption and heat efficiency; determining a target temperature of the diesel engine according to the first corresponding relation by taking the lowest oil consumption as a target;
the control variable determining module is used for determining a control variable of the water temperature according to the target temperature and the state space equation, wherein the control variable comprises a fan rotating speed control variable, an electric control water pump rotating speed control variable and a thermostat opening degree control variable;
and the water temperature control module is used for controlling the water temperature of the diesel engine according to the control variable.
8. A vehicle thermal management system, comprising: the system comprises a diesel engine, a smart fan, an electric control water pump, a controllable thermostat and a water temperature controller, wherein the water temperature controller is used for executing the water temperature control method according to any one of claims 1-6.
9. A storage medium containing computer executable instructions for performing a method of controlling water temperature according to any one of claims 1-6 when executed by a computer processor.
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