CN108278151B - Opening degree estimation method of electric heating thermostat - Google Patents
Opening degree estimation method of electric heating thermostat Download PDFInfo
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- CN108278151B CN108278151B CN201711419657.1A CN201711419657A CN108278151B CN 108278151 B CN108278151 B CN 108278151B CN 201711419657 A CN201711419657 A CN 201711419657A CN 108278151 B CN108278151 B CN 108278151B
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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
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Abstract
The invention provides a method for estimating the opening degree of an electric heating thermostat, which comprises the following steps: determining the paraffin temperature at the ith calculation time based on the paraffin temperature change value at the ith calculation time and the cooling water temperature of the engine at the ith calculation time; determining the heat absorption power of the paraffin at the i +1 th calculation time based on the resistance wire heating duty ratio at the i +1 th calculation time, and determining the heat exchange power of the paraffin at the i +1 th calculation time based on the determined paraffin temperature at the i +1 th calculation time and the determined cooling water temperature at the i +1 th calculation time; determining a paraffin temperature change value at the i +2 th calculation time based on the specific heat capacity of the paraffin, the mass of the paraffin, the determined heat absorption power of the paraffin at the i +1 th calculation time, the heat exchange power of the paraffin at the i +1 th calculation time and a preset rule; and estimating the opening degree of the thermostat at the i +2 th calculation time according to the determined paraffin temperature change value at the i +2 th calculation time. The method provided by the invention can reduce the cost and has strong practicability.
Description
Technical Field
The invention relates to a method for estimating the opening degree of a thermostat, in particular to a method for estimating the opening degree of an electric heating thermostat of an engine.
Background
The thermostat is a very important part in the implementation of the current engine thermal management system, and the installation position and the function of the thermostat can be shown in fig. 1. As shown in fig. 1, the thermostat is located in the engine coolant circuit and is part of the distribution to the radiator and engine block to control the water pump discharge rate. In the traditional paraffin wax thermostat, under the condition that the cooling liquid is low, a thermostat valve closes a channel between an engine and a radiator under the action of a spring, and the cooling liquid returns to the engine through a water pump, namely, the cooling liquid is in small circulation. With the gradual increase of the temperature of the cooling liquid, the paraffin begins to melt into liquid, and the valve is opened finally under the action of the push rod. At this time, the cooling liquid flows back to the engine through the radiator and the thermostat valve and then through the water pump to perform large circulation.
However, the conventional paraffin wax thermostat has been difficult to satisfy the requirement of rapidity and accuracy of response of water temperature partition control to water temperature control. The electronic thermostat has high response speed, but the cost is higher at present, and the electronic thermostat cannot be popularized to low-end cars. The electric heating thermostat has a structure shown in fig. 2, and may include a housing, a large circulation valve, a connection plug, a pressure spring, a small circulation valve, paraffin placed in a rubber tube, an expansion element, a lift pin, a temperature adjusting unit, a heating resistor, and the like, which are mounted on the housing, and the operating principle is as follows: when the cooling temperature of the cooling liquid of the engine is lower than a specified value, the refined paraffin in the thermostat temperature sensing body is in a solid state, the thermostat valve closes a channel between the engine and the radiator under the action of the pressure spring, and the cooling liquid returns to the engine through the water pump to perform small circulation in the engine. When the temperature of the cooling liquid reaches a specified value, the paraffin begins to melt and gradually becomes liquid, the volume is increased along with the melting of the paraffin, and the rubber tube is pressed to shrink. When the rubber tube contracts, the upward thrust is acted on the lift pin, and the downward reverse thrust of the push rod to the large circulating valve opens the valve. At this time, the coolant flows through a radiator and a thermostat valve provided in the coolant circuit, and then flows back to the engine through a water pump, and is circulated.
However, the existing electric heating thermostat needs to be provided with a position sensor to detect the opening degree of the thermostat, and because the position sensor has higher cost, part of middle-class cars can be provided with a position feedback sensor for the electric heating thermostat, so that the electric heating thermostat cannot be popularized.
Therefore, there is a high necessity for a solution that can realize the estimation of the opening degree of the electric heating thermostat at low cost.
Disclosure of Invention
In view of the above technical problems, the present invention provides a method for estimating an opening degree of an electric heating thermostat, and aims to solve the problem that on the premise of no position sensor feedback signal, a relatively accurate thermostat position is obtained by using an estimation model, so that the cost is reduced, the requirement of thermal management is met, and the purpose of reducing the oil consumption is finally achieved.
The technical scheme adopted by the invention is as follows:
the embodiment of the invention provides an opening degree estimation method of an electric heating thermostat, which is used for calculating the opening degree of the thermostat at each calculation time in a preset time period and comprises the following steps: determining the paraffin temperature at the ith calculation time based on the paraffin temperature change value at the ith calculation time and the cooling water temperature of the engine at the ith calculation time; wherein i is an integer greater than 0; determining the heat absorption power of the paraffin at the i +1 th calculation time based on the resistance wire heating duty ratio at the i +1 th calculation time, and determining the heat exchange power of the paraffin at the i +1 th calculation time based on the determined paraffin temperature at the i +1 th calculation time and the determined cooling water temperature at the i +1 th calculation time; determining a paraffin temperature change value at the i +2 th calculation time based on the specific heat capacity of the paraffin, the mass of the paraffin, the determined heat absorption power of the paraffin at the i +1 th calculation time, the heat exchange power of the paraffin at the i +1 th calculation time and a preset rule; and estimating the opening degree of the thermostat at the i +2 th calculation time according to the determined paraffin temperature change value at the i +2 th calculation time.
Optionally, the method further comprises: and if the heating duty ratio of the resistance wire at the ith calculation moment is continuously greater than the fully-opened minimum duty ratio corresponding to the cooling water temperature at the calculation moment within the preset time, setting the opening degree of the thermostat at the calculation moment to be 100%, and setting the paraffin temperature at the calculation moment to be the temperature corresponding to the 100% opening degree.
Optionally, the fully-open minimum duty ratio corresponding to the cooling water temperature at the ith calculation time is determined based on the cooling water temperature at the ith calculation time and a preset first characteristic table, and the preset first characteristic table represents the corresponding relationship between different cooling water temperatures and the resistance wire heating duty ratio.
Optionally, the paraffin temperature change value at the 1 st calculation time is determined based on the specific heat capacity of the paraffin, the mass of the paraffin, the heat absorption power of the paraffin at the 1 st calculation time, the heat exchange power of the paraffin at the 1 st calculation time and the preset rule, wherein the heat absorption power of the paraffin at the 1 st calculation time is determined based on the resistance wire heating duty ratio at the 1 st calculation time; and the heat exchange power of the paraffin at the 1 st calculation moment is determined based on the preset initial temperature of the paraffin and the cooling water temperature at the 1 st calculation moment.
Optionally, the determining, based on the resistance wire heating duty ratio at the 1 st calculation time, the endothermic power of the paraffin at the 1 st calculation time includes: and determining the heat absorption power of the paraffin at the 1 st calculation time based on the determined resistance wire heating duty ratio at the 1 st calculation time and a preset second characteristic table, wherein the preset second characteristic table represents the corresponding relation between different resistance wire heating duty ratios and the heat absorption power of the paraffin.
Optionally, the determining, based on the preset initial temperature of the paraffin and the cooling water temperature at the 1 st calculation time, the heat exchange power of the paraffin at the 1 st calculation time includes: determining the temperature deviation between the initial temperature and the cooling water temperature at the 1 st calculation time based on the preset initial temperature of the paraffin and the cooling water temperature at the 1 st calculation time; and determining the heat exchange power of the paraffin at the 1 st calculation moment based on the determined temperature deviation and a preset third characteristic table, wherein the preset third characteristic table represents the corresponding relation between different temperature deviations and the heat exchange power of the paraffin.
Optionally, the determining the heat absorption power of the paraffin at the i +1 th calculation time based on the resistance wire heating duty ratio at the i +1 th calculation time includes: and determining the heat absorption power of the paraffin at the i +1 th calculation time based on the determined resistance wire heating duty ratio at the i +1 th calculation time and a preset second characteristic table, wherein the preset second characteristic table represents the corresponding relation between different resistance wire heating duty ratios and the heat absorption power of the paraffin.
Optionally, the determining the heat exchange power of the paraffin at the i +1 th calculation time based on the determined paraffin temperature at the i th calculation time and the determined cooling water temperature at the i +1 th calculation time includes: determining a temperature deviation between the paraffin temperature at the ith calculation time and the cooling water temperature at the (i + 1) th calculation time based on the determined paraffin temperature at the ith calculation time and the cooling water temperature at the (i + 1) th calculation time; and determining the heat exchange power of the paraffin at the i +1 th calculation moment based on the determined temperature deviation and a preset third characteristic table, wherein the preset third characteristic table represents the corresponding relation between different temperature deviations and the heat exchange power of the paraffin.
Optionally, the estimating the opening degree of the thermostat at the i +2 th calculation time according to the paraffin temperature change value at the i +2 th calculation time includes: determining the paraffin temperature at the i +2 th calculation time according to the paraffin temperature change value at the i +2 th calculation time and the cooling water temperature of the engine at the i +2 th calculation time; and estimating the opening degree of the thermostat at the i +2 th calculation time based on the determined paraffin temperature at the i +2 th calculation time and a preset fourth characteristic table, wherein the preset fourth characteristic table represents the corresponding relation between different paraffin temperatures and the opening degree of the thermostat.
The method for estimating the opening of the electric heating thermostat provided by the embodiment of the invention can be realized only by an estimation model without increasing any cost, so that the electric heating thermostat has opening feedback information, the heat management of the whole vehicle is facilitated, and lower oil consumption is realized.
Drawings
FIG. 1 is a schematic diagram showing the installation location and operation of a thermostat of the prior art;
FIG. 2 is a schematic diagram of a prior art electric thermostat;
fig. 3 is a flowchart illustrating a method for estimating an opening degree of an electric heating thermostat according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The method for estimating the opening degree of the electric heating thermostat provided by the embodiment of the invention is used for estimating the opening degree of the existing electric heating thermostat, and in one example, the method can be used for estimating the opening degree of the electric heating thermostat shown in fig. 2.
The method for estimating the opening degree of the electric heating thermostat is used for calculating the opening degree of the thermostat at each calculation time in a preset time period and can be executed by an Engine Control Unit (ECU). The preset time period in the present embodiment may be a time period from the start of the vehicle to the stop of the vehicle, each calculation time may be set by actual conditions, and may be performed inside the ECU by a start timing mechanism, for example, the ECU may perform the estimation of the opening degree once every 10s, so that the interval between each calculation time is 10s, and at each calculation time, the ECU may automatically perform the calculation of the opening degree of the thermostat. In practical application, the ECU can control the opening degree of the thermostat by utilizing the estimated opening degree of the thermostat at any time.
When the method for estimating the opening degree of the electric heating thermostat provided in this embodiment is used to estimate the opening degree of the thermostat, 4 preset characteristic tables, namely, the first to fourth preset characteristic tables, are required, and the 4 characteristic tables are described first.
Preset first character table
In the present embodiment, the preset first characteristic table represents the correspondence relationship between different cooling water temperatures and resistance wire heating duty ratios, that is, the thermostat heating duty ratio (FulOpn _ Thmst _ Percent) corresponding to the full thermostat opening from the current water temperature (ECT) of the cooling water of the engine. The characteristic table can be obtained as follows: placing flowmeters in front of and behind the electric heating thermostat, namely respectively arranging the flowmeters on a water inlet pipeline and a water outlet pipeline of the electric heating thermostat, and then loading control signals for increasing the duty ratio for the heating resistance wire at different paraffin temperatures, for example, at different paraffin temperatures with the paraffin temperature step length of 10 ℃, for example, loading the increasing duty ratio of 5 percent until the numerical values of the flowmeters in front of and behind are the same, so that the thermostat is proved to be completely opened. In one example, the resulting first characteristic table form may be as shown in table 1 below:
TABLE 1
Preset second character table
In this embodiment, the preset second characteristic table represents different resistance wire heating duty ratios (FulOpn _ Thmst _ Percent) and the heat absorption power of the paraffin
The corresponding relation between them. The characteristic table can be obtained as follows: in the insulated box, the cooling liquid and the paraffin are placed, the paraffin heating resistor is supplied with currents with different duty ratios, for example, the currents with the duty ratios at intervals of 10%, and then the heat absorption power of the cooling liquid, namely the heat absorption power of the paraffin can be converted by measuring the temperature change of the cooling liquid. In one example, the resulting second characterization form may be as shown in table 2 below:
TABLE 2
Preset third character table
In this embodiment, the preset third characteristic table represents a corresponding relationship between different temperature deviations and heat exchange power of the paraffin, that is, a deviation between a paraffin temperature (Wax _ Temp) and a water temperature and an external heat release power of the paraffin
The corresponding relation between them. The characteristic table can be obtained as follows: in the heat-insulating box, cooling liquid and paraffin are placed, under the condition of utilizing different water temperature deviations, the temperature change of the cooling liquid is measured and converted into cooling liquid heat exchange power, namely the heat exchange power of the paraffin, when the water temperature is higher than the paraffin temperature, the heat absorption power of the paraffin can be expressed by positive numbers, and when the water temperature is lower than the paraffin temperature, the heat exchange power of the paraffin can be expressed by negative numbersExpressed by numbers, can be determined by the formula E ═ c × m × δ T, where c is the specific heat capacity of the coolant, m is the mass of the coolant, and δ T is the change in temperature of the coolant. In one example, the resulting second profile may be as shown in table 3 below:
TABLE 3
Preset fourth character table
In the present embodiment, the preset fourth characteristic table represents the correspondence between different paraffin temperatures and the opening degree Thmst _ Pos of the thermostat. The characteristic table can be obtained as follows: the flow meters are arranged in front of and behind the electric heating thermostat, and the current thermostat opening value is determined by the flow rate ratio of the flow meters under different paraffin temperatures, for example, under different paraffin temperatures with the paraffin temperature step of 10 ℃, for example, two output flow meters, the measurement value of one flow meter is 5L/h, the measurement value of the other flow meter is 15L/h, and then the opening is 5/(5+15) ═ 40%. In one example, the resulting second profile may be as shown in table 4 below:
TABLE 4
Hereinafter, the method for estimating the opening degree of the electrically heated thermostat according to the embodiment of the present invention will be described with reference to the 4 preset characteristic tables and fig. 3.
Fig. 3 is a flowchart illustrating a method for estimating an opening degree of an electric heating thermostat according to an embodiment of the present invention. As shown in fig. 3, the method for estimating the opening degree of the electrically heated thermostat according to the embodiment of the present invention includes the following steps:
s101, determining the paraffin temperature at the ith calculation time based on the paraffin temperature change value at the ith calculation time and the cooling water temperature of the engine at the ith calculation time; wherein i is an integer greater than 0.
In this step, the paraffin temperature at the ith calculation time may be equal to the sum of the paraffin temperature variation value at the ith calculation time and the cooling water temperature of the engine at the ith calculation time.
S102, determining the heat absorption power of the paraffin at the i +1 th calculation moment based on the resistance wire heating duty ratio at the i +1 th calculation moment, and determining the heat exchange power of the paraffin at the i +1 th calculation moment based on the paraffin temperature at the i +1 th calculation moment and the cooling water temperature at the i +1 th calculation moment determined in the step S101.
In this step, the determining the endothermic power of the paraffin at the i +1 th calculation time based on the resistance wire heating duty ratio at the i +1 th calculation time may include: and determining the heat absorption power of the paraffin at the i +1 th calculation time based on the determined resistance wire heating duty ratio at the i +1 th calculation time and the preset second characteristic table, and looking up the table 2 through the resistance wire heating duty ratio at the i +1 th calculation time to obtain the corresponding heat absorption power of the paraffin.
The determining of the heat exchange power of the paraffin at the i +1 th calculation time based on the determined paraffin temperature at the i th calculation time and the determined cooling water temperature at the i +1 th calculation time may include: determining a temperature deviation between the paraffin temperature at the ith calculation time and the cooling water temperature at the (i + 1) th calculation time based on the determined paraffin temperature at the ith calculation time and the cooling water temperature at the (i + 1) th calculation time; and determining the heat exchange power of the paraffin at the i +1 th calculation moment based on the determined temperature deviation and a preset third characteristic table, namely looking up the table 3 through the calculated temperature deviation to obtain the corresponding heat exchange power of the paraffin.
S103, determining a paraffin temperature change value at the i +2 th calculation time based on the specific heat capacity of the paraffin, the mass of the paraffin, the heat absorption power of the paraffin at the i +1 th calculation time determined in the step S102, the heat exchange power of the paraffin at the i +1 th calculation time and a preset rule.
In the embodiment of the present invention, the paraffin temperature change value at each calculation time may be calculated by the following formula (1):
wherein, cwaxAnd mwaxRespectively representing stoneThe specific heat capacity and mass of the wax can be calibrated by tests,
the paraffin temperature change value is the paraffin temperature change value from the last calculation time to the current calculation time,
the heat absorption power of the paraffin may be obtained by referring to the second characteristic table on the basis of a deviation between the temperature of the paraffin determined at the last calculation time and the temperature of the cooling water at the present calculation time,
the heat exchange power of the paraffin can be obtained by referring to the third characteristic table based on the measured resistance ratio heating duty ratio at the current calculation time.
After the paraffin temperature change value at each calculation time is determined through the formula (1), the paraffin temperature at the current calculation time can be further determined based on the calculated paraffin temperature change value and the currently measured cooling water temperature of the engine, and finally, the corresponding thermostat opening can be obtained by utilizing the fourth characteristic table.
Specifically, the paraffin temperature change value at the i +2 th calculation time can be determined by the above equation (1), and specifically, the specific heat capacity of the paraffin, the mass of the paraffin, the determined endothermic power of the paraffin at the i +1 th calculation time, and the determined heat exchange power of the paraffin at the i +1 th calculation time are respectively substituted into the above equation (1) to obtain the paraffin temperature change value at that time.
And S104, estimating the opening degree of the thermostat at the i +2 th calculation time according to the paraffin temperature change value at the i +2 th calculation time determined in the step S103.
The steps may specifically include: determining the paraffin temperature at the i +2 th calculation time according to the paraffin temperature change value at the i +2 th calculation time and the cooling water temperature of the engine at the i +2 th calculation time; and estimating the opening degree of the thermostat at the i +2 th calculation time based on the determined paraffin temperature at the i +2 th calculation time and a preset fourth characteristic table.
Specifically, after determining the paraffin temperature variation value at the i +2 th calculation time according to the formula (1) in step S130, the calculated paraffin temperature variation value may be added to the cooling water temperature at the time to obtain the paraffin temperature at the time, and then the opening degree of the thermostat corresponding to the time may be obtained by referring to the above table 4.
Further, in the process of calculating the opening degree, the paraffin temperature change value at the 1 st calculation time when i is 1 can be determined based on the specific heat capacity of the paraffin, the mass of the paraffin, the heat absorption power of the paraffin at the 1 st calculation time, the heat exchange power of the paraffin at the 1 st calculation time and the preset rule, wherein the heat absorption power of the paraffin at the 1 st calculation time is determined based on the resistance wire heating duty ratio at the 1 st calculation time; and the heat exchange power of the paraffin at the 1 st calculation moment is determined based on the preset initial temperature of the paraffin and the cooling water temperature at the 1 st calculation moment. Wherein, the determination of the heat absorption power of the paraffin at the 1 st calculation time based on the resistance wire heating duty ratio at the 1 st calculation time may include: and determining the heat absorption power of the paraffin at the 1 st calculation moment based on the determined resistance wire heating duty ratio at the 1 st calculation moment and a preset second characteristic table. The determining of the heat exchange power of the paraffin at the 1 st calculation time based on the preset initial temperature of the paraffin and the cooling water temperature at the 1 st calculation time may include: determining the temperature deviation between the initial temperature and the cooling water temperature at the 1 st calculation time based on the preset initial temperature of the paraffin and the cooling water temperature at the 1 st calculation time; and determining the heat exchange power of the paraffin at the 1 st calculation moment based on the determined temperature deviation and a preset third characteristic table.
The initial temperature of paraffin in the embodiment of the invention may be determined based on the engine stall state. For example, when the ECU determines that the engine stall time reaches a preset time, which is determined according to vehicle types, and the required preset time is different for different vehicle types, in one example, when the engine stall time exceeds 1h, the initial paraffin temperature may be set to the cooling water temperature measured at the 1 st calculation time, at which the endothermic power of paraffin may be 0, and when the ECU determines that the engine stall time does not reach the preset time, the paraffin temperature calculated in the previous calculation cycle may be used as the initial paraffin temperature.
After the paraffin temperature change value at the 1 st calculation time is determined, the cooling water temperature at that time may be added to the paraffin temperature change value to obtain the paraffin temperature at that time, and the opening degree of the thermostat at that time may be obtained based on the fourth characteristic table. Accordingly, the calculation of the opening degree of the thermostat at each subsequent calculation time (i is 2 or more) can be determined with reference to the opening degree calculation method of the thermostat at the 1 st calculation time.
In addition, in order to eliminate an accumulated error generated by the calculation of the paraffin temperature in the calculation process, the method for estimating the opening degree of the electric heating thermostat provided by the embodiment of the invention further comprises the following steps: if the heating duty ratio of the resistance wire at the ith calculation time is continuously larger than the fully-opened minimum duty ratio corresponding to the cooling water temperature at the calculation time within a preset time (for example, 30s), the opening degree of the thermostat at the calculation time is set to be 100%, the paraffin temperature at the calculation time is set to be the temperature corresponding to the 100% opening degree, the paraffin temperature at the time is updated, and in the calculation of the paraffin temperature change value at the next time, the updated paraffin temperature is used for determining the heat absorption power of the corresponding paraffin. The fully-open minimum duty ratio corresponding to the cooling water temperature at the ith calculation time may be determined based on the cooling water temperature at the ith calculation time and the preset first characteristic table, that is, the corresponding fully-open minimum duty ratio is obtained by referring to the table 1 by using the cooling water temperature at the current calculation time.
In summary, the method for estimating the opening degree of the electric heating thermostat provided by the embodiment of the invention adopts a pure software mode to calculate the opening degree of the electric heating thermostat, so that the method has great economic benefit on cost. Compared with the traditional thermostat without position feedback, the thermostat has the advantages of higher accuracy and higher responsiveness for the heat management of the automobile. On the premise that the correlation characteristic table can be calibrated accurately, the estimation precision can be ensured.
The above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. An opening degree estimation method for an electrically heated thermostat, the method being used for calculating an opening degree of the thermostat at each calculation time within a preset time period, and comprising:
determining the paraffin temperature at the ith calculation time based on the paraffin temperature change value at the ith calculation time and the cooling water temperature of the engine at the ith calculation time; wherein i is an integer greater than 0;
different resistance wire heating duty ratios and paraffin heat absorption power are represented by a preset second characteristic table
The heat absorption power of the paraffin at the i +1 th calculation time is determined based on the resistance wire heating duty ratio at the i +1 th calculation time, a preset third characteristic table represents the corresponding relation between the temperature deviation of the paraffin temperature and the water temperature and the heat exchange power of the paraffin, and the heat exchange power of the paraffin at the i +1 th calculation time is determined based on the determined paraffin temperature at the i +1 th calculation time and the cooling water temperature at the i +1 th calculation time;
determining a paraffin temperature change value at the i +2 th calculation time based on the specific heat capacity of the paraffin, the mass of the paraffin, the determined heat absorption power of the paraffin at the i +1 th calculation time, the heat exchange power of the paraffin at the i +1 th calculation time and a preset rule;
according to the determined paraffin temperature change value at the i +2 th calculation time, representing the corresponding relation between different paraffin temperatures and the opening of the thermostat through a preset fourth characteristic table, and predicting the opening of the thermostat at the i +2 th calculation time;
the preset rule is that the paraffin temperature change value at each calculation moment is calculated by the following formula:
wherein, cwaxAnd mwaxRespectively represents the specific heat capacity and the mass of the paraffin, can be calibrated by tests,
the paraffin temperature change value is the paraffin temperature change value from the last calculation time to the current calculation time,
is the heat absorption power of the paraffin wax,
heat exchange power for paraffin;
if the heating duty ratio of the resistance wire at the ith calculation moment is continuously greater than the fully-opened minimum duty ratio corresponding to the cooling water temperature at the calculation moment within the preset time, setting the opening degree of the thermostat at the calculation moment to be 100%, and setting the paraffin temperature at the calculation moment to be the temperature corresponding to 100% of the opening degree;
the fully-open minimum duty ratio corresponding to the cooling water temperature at the ith calculation moment is determined based on the cooling water temperature at the ith calculation moment and a preset first characteristic table, and the preset first characteristic table represents the corresponding relation between different cooling water temperatures and the resistance wire heating duty ratio.
2. The method according to claim 1, wherein the paraffin temperature variation value at the 1 st calculation time is determined based on the specific heat capacity of the paraffin, the mass of the paraffin, the endothermic power of the paraffin at the 1 st calculation time, the heat exchange power of the paraffin at the 1 st calculation time, and the preset rule,
the heat absorption power of the paraffin at the 1 st calculation moment is determined based on the resistance wire heating duty ratio at the 1 st calculation moment;
and the heat exchange power of the paraffin at the 1 st calculation moment is determined based on the preset initial temperature of the paraffin and the cooling water temperature at the 1 st calculation moment.
3. The method as claimed in claim 2, wherein the determination of the endothermic power of the paraffin at the 1 st calculation time based on the resistance wire heating duty ratio at the 1 st calculation time comprises:
and determining the heat absorption power of the paraffin at the 1 st calculation time based on the determined resistance wire heating duty ratio at the 1 st calculation time and a preset second characteristic table, wherein the preset second characteristic table represents the corresponding relation between different resistance wire heating duty ratios and the heat absorption power of the paraffin.
4. The method according to claim 2, wherein the determining of the heat exchange power of the paraffin at the 1 st calculation time based on the preset paraffin initial temperature and the cooling water temperature at the 1 st calculation time comprises:
determining the temperature deviation between the initial temperature and the cooling water temperature at the 1 st calculation time based on the preset initial temperature of the paraffin and the cooling water temperature at the 1 st calculation time;
and determining the heat exchange power of the paraffin at the 1 st calculation moment based on the determined temperature deviation and a preset third characteristic table, wherein the preset third characteristic table represents the corresponding relation between different temperature deviations and the heat exchange power of the paraffin.
5. The method as claimed in claim 1, wherein the determining the endothermic power of the paraffin at the i +1 th calculation time based on the resistance wire heating duty ratio at the i +1 th calculation time comprises:
and determining the heat absorption power of the paraffin at the i +1 th calculation time based on the determined resistance wire heating duty ratio at the i +1 th calculation time and a preset second characteristic table, wherein the preset second characteristic table represents the corresponding relation between different resistance wire heating duty ratios and the heat absorption power of the paraffin.
6. The method according to claim 1, wherein the determining the heat exchange power of the paraffin at the i +1 th calculation time based on the determined paraffin temperature at the i +1 th calculation time and the determined cooling water temperature at the i +1 th calculation time comprises:
determining a temperature deviation between the paraffin temperature at the ith calculation time and the cooling water temperature at the (i + 1) th calculation time based on the determined paraffin temperature at the ith calculation time and the cooling water temperature at the (i + 1) th calculation time;
and determining the heat exchange power of the paraffin at the i +1 th calculation moment based on the determined temperature deviation and a preset third characteristic table, wherein the preset third characteristic table represents the corresponding relation between different temperature deviations and the heat exchange power of the paraffin.
7. The method according to claim 1, wherein the estimating the opening degree of the thermostat at the i +2 th calculation time according to the paraffin temperature variation value at the i +2 th calculation time comprises:
determining the paraffin temperature at the i +2 th calculation time according to the paraffin temperature change value at the i +2 th calculation time and the cooling water temperature of the engine at the i +2 th calculation time;
and estimating the opening degree of the thermostat at the i +2 th calculation time based on the determined paraffin temperature at the i +2 th calculation time and a preset fourth characteristic table, wherein the preset fourth characteristic table represents the corresponding relation between different paraffin temperatures and the opening degree of the thermostat.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FR3086989B1 (en) * | 2018-10-05 | 2020-10-23 | Novares France | THERMOSTATIC VALVE AND VEHICLE INCLUDING THIS VALVE |
| CN112163270B (en) * | 2020-09-04 | 2022-09-13 | 中国第一汽车股份有限公司 | CFD automatic modeling and analyzing system and method based on ANSA and StarCCM + platform |
| CN113027591B (en) * | 2021-03-31 | 2022-10-25 | 潍柴动力股份有限公司 | Equipment and method for controlling movement of main valve of electronic thermostat |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102493863A (en) * | 2011-12-26 | 2012-06-13 | 潍柴动力股份有限公司 | Thermostat and engine cooling system |
| CN202351063U (en) * | 2011-11-07 | 2012-07-25 | 玉柴联合动力股份有限公司 | Detector for thermostat |
| DE102011114308A1 (en) * | 2011-09-23 | 2013-03-28 | Audi Ag | Valve device for drive device, has non-return valve allowing flow only from direction of supply line, and switching element controlling thermostat valve and arranged in or at intersection of lines in which valves are provided |
| CN103670656A (en) * | 2012-09-13 | 2014-03-26 | 北京汽车动力总成有限公司 | Thermostat |
| CN203809097U (en) * | 2014-04-02 | 2014-09-03 | 广西玉柴机器股份有限公司 | Intelligent thermal management system of diesel engine |
| CN106285907A (en) * | 2016-10-19 | 2017-01-04 | 潍柴动力股份有限公司 | The control method of a kind of engine temperature, Apparatus and system |
-
2017
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011114308A1 (en) * | 2011-09-23 | 2013-03-28 | Audi Ag | Valve device for drive device, has non-return valve allowing flow only from direction of supply line, and switching element controlling thermostat valve and arranged in or at intersection of lines in which valves are provided |
| CN202351063U (en) * | 2011-11-07 | 2012-07-25 | 玉柴联合动力股份有限公司 | Detector for thermostat |
| CN102493863A (en) * | 2011-12-26 | 2012-06-13 | 潍柴动力股份有限公司 | Thermostat and engine cooling system |
| CN103670656A (en) * | 2012-09-13 | 2014-03-26 | 北京汽车动力总成有限公司 | Thermostat |
| CN203809097U (en) * | 2014-04-02 | 2014-09-03 | 广西玉柴机器股份有限公司 | Intelligent thermal management system of diesel engine |
| CN106285907A (en) * | 2016-10-19 | 2017-01-04 | 潍柴动力股份有限公司 | The control method of a kind of engine temperature, Apparatus and system |
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