CN113530659B - Fan control method and device, electronic equipment and medium - Google Patents
Fan control method and device, electronic equipment and medium Download PDFInfo
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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
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- F01P7/02—Controlling of coolant flow the coolant being cooling-air
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Abstract
The application discloses a fan control method, a fan control device, electronic equipment and a medium, which relate to the technical field of automotive electronics, and are characterized in that when the duration of a vehicle in a stable state exceeds a preset time threshold, a target rotating speed of a fan is determined according to a reference rotating speed and a reference torque; in a stable state, the fluctuation range of the real-time rotating speed of the vehicle relative to the reference rotating speed does not exceed a preset first fluctuation threshold value, and the fluctuation range of the real-time torque of the vehicle relative to the reference torque does not exceed a preset second fluctuation threshold value; the reference rotating speed is the rotating speed when the vehicle enters a stable state; the reference torque is the torque when the vehicle enters a steady state; the fan is adjusted based on the target speed. According to the method, the rotating speed of the fan is controlled according to the load of the vehicle in the stable state based on the monitored duration of the vehicle in the stable state, the rotating speed of the fan can be controlled according to the stable heat dissipation requirement of the vehicle, the frequent starting and stopping of the rotating speed of the fan in the running process of the actual vehicle can be reduced, and the power consumption of the fan is reduced.
Description
Technical Field
The present disclosure relates to the field of automotive electronics, and in particular, to a method and an apparatus for controlling a fan, an electronic device and a medium.
Background
During the running process of the vehicle, the engine can generate a large amount of heat, and the engine needs to be cooled by cooling liquid in the engine so as to ensure the normal running of the vehicle.
At present, a vehicle control system can cool an engine through cooling liquid by fan control according to the temperature of the engine. The existing fan control generally takes actual water temperature as a target for control, but the fluctuation of the rotation speed of the fan is large due to large fluctuation of the water temperature, and the power consumption of the fan is high.
Disclosure of Invention
The embodiment of the application provides a fan control method, a fan control device, electronic equipment and a medium, which can control the rotating speed of a fan according to the load of a vehicle in a stable state based on the duration of the vehicle in the stable state, so that the occurrence of frequent starting and stopping of the rotating speed of the fan in the running process of a real vehicle is reduced, and the power consumption of the fan is reduced.
In a first aspect, an embodiment of the present application provides a fan control method, where the method includes:
if the duration of the vehicle in the stable state exceeds a preset time threshold, determining the target rotating speed of the fan according to the reference rotating speed and the reference torque; in the steady state, the fluctuation range of the real-time rotating speed of the vehicle relative to the reference rotating speed does not exceed a preset first fluctuation threshold value, and the fluctuation range of the real-time torque of the vehicle relative to the reference torque does not exceed a preset second fluctuation threshold value; the reference rotation speed is a rotation speed of the vehicle when the vehicle enters the steady state; the reference torque is a torque at which the vehicle enters the steady state;
adjusting the fan based on the target speed.
The method comprises the steps that when the time length of a vehicle in a stable state exceeds a preset time threshold value, the target rotating speed of a fan is determined according to the reference rotating speed and the reference torque; in a stable state, the fluctuation range of the real-time rotating speed of the vehicle relative to the reference rotating speed does not exceed a preset first fluctuation threshold value, and the fluctuation range of the real-time torque of the vehicle relative to the reference torque does not exceed a preset second fluctuation threshold value; the reference rotating speed is the rotating speed when the vehicle enters a stable state; the reference torque is the torque when the vehicle enters a steady state; the fan is adjusted based on the target speed. According to the method, the rotating speed of the fan is controlled according to the load of the vehicle in the stable state based on the monitored duration of the vehicle in the stable state, the rotating speed of the fan can be controlled according to the stable heat dissipation requirement of the vehicle, the frequent starting and stopping of the rotating speed of the fan in the actual running process can be reduced, and the power consumption of the fan is reduced.
In one possible implementation, the determining a target rotation speed of the fan according to the reference rotation speed and the reference torque includes:
and determining the target rotating speed corresponding to the reference rotating speed and the reference torque according to a first corresponding relation of a preset rotating speed value, a preset torque value and a preset fan rotating speed.
According to the method, the target rotating speed corresponding to the reference rotating speed and the reference torque is determined according to the first corresponding relation of the preset rotating speed value, the preset torque value and the preset fan rotating speed, the target rotating speed can be determined more quickly and efficiently, the duration of the vehicle in the stable state based on monitoring is realized, the fan rotating speed is controlled according to the load of the vehicle in the stable state, the fan rotating speed can be controlled according to the stable heat dissipation requirement of the vehicle, the frequent starting and stopping of the fan rotating speed in the actual vehicle running process can be reduced, and the power consumption of the fan is reduced.
In a possible implementation manner, the first corresponding relationship is obtained by the following method:
determining a plurality of sets of calibrated operating parameters of the vehicle; the calibration operation parameters comprise a calibration rotating speed, a calibration torque and a calibration vehicle speed of the vehicle when the fluctuation of the rotating speed of the fan exceeds a preset third fluctuation threshold;
according to the finished automobile resistance parameter obtained through simulation and a second corresponding relation of a preset rotating speed value, a preset torque value and a preset heat dissipation capacity, determining the calibrated rotating speed of the fan corresponding to each calibrated operating parameter;
and obtaining the first corresponding relation according to the calibration operation parameters and the calibration rotating speed.
By the method, a plurality of groups of calibrated operating parameters of the vehicle with large fluctuation of the rotating speed of the fan can be found; acquiring a finished automobile resistance parameter through simulation; determining the calibrated rotating speed of the fan corresponding to each calibrated operating parameter through the resistance parameter of the whole vehicle and the second corresponding relation between the preset rotating speed value, the preset torque value and the heat dissipating capacity; and obtaining the first corresponding relation according to the calibration operation parameters and the calibration rotating speed. According to the method, in the process of obtaining the first corresponding relation, the calibrated rotating speed of the fan corresponding to each calibrated operating parameter is determined based on a plurality of groups of calibrated operating parameters of the vehicle with larger fluctuation of the rotating speed of the fan, so that the first corresponding relation of the preset rotating speed value, the preset torque value and the rotating speed of the fan has stronger pertinence to the fluctuation of the rotating speed of the fan, the rotating speed of the fan is controlled according to the load of the vehicle in a stable state based on the duration that the monitored vehicle is in the stable state, the rotating speed of the fan can be more effectively controlled according to the stable heat dissipation requirement of the vehicle, the frequent starting and stopping of the rotating speed of the fan in the actual vehicle operation process is reduced, and the power consumption of the fan is effectively reduced.
In a possible implementation manner, determining the calibrated rotational speed of the fan corresponding to each calibrated operating parameter according to the entire vehicle resistance parameter and the second corresponding relationship between the preset rotational speed value, the preset torque value and the heat dissipation capacity includes:
determining a calibration heat dissipation amount corresponding to the calibration operation parameter according to a second corresponding relation between a preset rotating speed value, a preset torque value and the heat dissipation amount; the calibrated heat dissipation capacity represents the total heat dissipation capacity required by the vehicle;
determining calibrated natural heat dissipation according to the finished automobile resistance parameter and the calibrated speed; the calibrated natural heat dissipation capacity represents the heat dissipation capacity of the wind flowing through the surface of the vehicle on the cooling liquid;
determining the heat dissipation capacity of the fan according to the calibrated heat dissipation capacity and the calibrated natural heat dissipation capacity; the heat dissipation capacity of the fan represents the heat dissipation capacity of the wind of the fan on the cooling liquid;
and determining the calibrated fan rotating speed corresponding to the calibrated operating parameter according to the heat dissipating capacity of the fan.
According to the method, the heat dissipation capacity of the cooling liquid generated by the wind of the fan is obtained by determining the total heat dissipation capacity required by the vehicle and the heat dissipation capacity of the cooling liquid generated by the wind flowing through the surface of the vehicle, and then the calibrated fan rotating speed corresponding to the calibrated operation parameter is determined. According to the method, the wind flowing through the surface of the vehicle is determined by combining the calibrated vehicle speed, and the heat dissipation capacity generated by the wind of the fan is corrected by the heat dissipation capacity of the wind flowing through the surface of the vehicle, so that the rotating speed of the fan can be controlled according to the stable heat dissipation requirement of the vehicle, the frequent starting and stopping of the rotating speed of the fan in the running process of the actual vehicle are reduced, the control accuracy of the rotating speed of the fan can be enhanced, and the power consumption of the fan is further reduced.
In one possible implementation, the method further includes:
and if the fluctuation range of the real-time rotating speed of the vehicle relative to the reference rotating speed exceeds a preset first fluctuation threshold value, or the fluctuation range of the real-time torque of the vehicle relative to the reference torque exceeds a preset second fluctuation threshold value, re-determining the stable state of the vehicle according to the real-time rotating speed and the real-time torque.
In the method, if the fluctuation range of the real-time rotating speed of the vehicle relative to the reference rotating speed exceeds a preset first fluctuation threshold value, or the fluctuation range of the real-time torque of the vehicle relative to the reference torque exceeds a preset second fluctuation threshold value, the stable state of the vehicle is determined again according to the real-time rotating speed and the real-time torque. The method can continuously monitor the stable state of the vehicle, and control the rotating speed of the fan according to the current stable state by re-determining the stable state of the vehicle, so that the real-time performance of the rotating speed control of the fan is improved.
In a possible implementation manner, before the adjusting the fan based on the target rotation speed, the method further includes:
and if the duration of the vehicle in the stable state does not exceed a preset time threshold, taking the current rotating speed of the fan as the target rotating speed.
According to the method, if the time length of the vehicle in the stable state does not exceed the preset time threshold, the current rotating speed of the fan is taken as the target rotating speed. The method enables the fan to keep the previous rotating speed when the duration of the vehicle in the stable state does not exceed the preset time threshold, so that the fan can be continuously controlled according to the target rotating speed, the method is simple and easy to implement, the calculated amount of the fan in the rotating speed control is reduced, the rotating speed of the fan is prevented from being controlled by taking the actual water temperature as the target, the rotating speed of the fan is controlled according to the monitored duration of the vehicle in the stable state and the stable heat dissipation requirement of the vehicle by adopting a mode of controlling the rotating speed of the fan according to the load of the vehicle in the stable state, the frequent starting and stopping of the rotating speed of the fan in the actual vehicle running process can be reduced, and the power consumption of the fan is reduced.
In a second aspect, an embodiment of the present application provides a fan control apparatus, including:
the target rotating speed determining unit is used for determining the target rotating speed of the fan according to the reference rotating speed and the reference torque when the time length of the vehicle in the stable state exceeds a preset time threshold; in the steady state, the fluctuation range of the real-time rotating speed of the vehicle relative to the reference rotating speed does not exceed a preset first fluctuation threshold value, and the fluctuation range of the real-time torque of the vehicle relative to the reference torque does not exceed a preset second fluctuation threshold value; the reference rotation speed is a rotation speed of the vehicle when the vehicle enters the steady state; the reference torque is a torque when the vehicle enters the steady state;
and the fan adjusting unit is used for adjusting the fan based on the target rotating speed.
In a possible implementation manner, the target rotation speed determination unit is specifically configured to:
and determining the target rotating speed corresponding to the reference rotating speed and the reference torque according to a first corresponding relation of a preset rotating speed value, a preset torque value and a preset fan rotating speed.
In a possible implementation manner, the system further includes a relationship building unit, where the relationship building unit is configured to:
determining a plurality of sets of calibrated operating parameters of the vehicle; the calibration operation parameters comprise a calibration rotating speed, a calibration torque and a calibration vehicle speed of the vehicle when the fluctuation of the rotating speed of the fan exceeds a preset third fluctuation threshold;
according to the finished automobile resistance parameter obtained through simulation and a second corresponding relation of a preset rotating speed value, a preset torque value and a preset heat dissipation amount, determining the calibrated rotating speed of the fan corresponding to each calibrated operating parameter;
and obtaining the first corresponding relation according to the calibration operation parameters and the calibration rotating speed.
In a possible implementation manner, the relationship building unit is specifically configured to:
determining a calibration heat dissipation capacity corresponding to the calibration operation parameter according to a second corresponding relation between a preset rotating speed value, a preset torque value and the heat dissipation capacity; the calibrated heat dissipation capacity represents the total heat dissipation capacity required by the vehicle;
determining the calibrated natural heat dissipating capacity according to the whole vehicle resistance parameter and the calibrated vehicle speed; the calibrated natural heat dissipation capacity represents the heat dissipation capacity of the wind flowing through the surface of the vehicle on the cooling liquid;
determining the heat dissipating capacity of the fan according to the calibrated heat dissipating capacity and the calibrated natural heat dissipating capacity; the heat dissipation capacity of the fan represents the heat dissipation capacity of the wind of the fan on the cooling liquid;
and determining the calibrated fan rotating speed corresponding to the calibrated operating parameter according to the heat dissipating capacity of the fan.
In a possible implementation manner, the mobile terminal further includes a steady state monitoring unit, where the steady state monitoring unit is configured to:
and if the fluctuation range of the real-time rotating speed of the vehicle relative to the reference rotating speed exceeds a preset first fluctuation threshold value, or the fluctuation range of the real-time torque of the vehicle relative to the reference torque exceeds a preset second fluctuation threshold value, re-determining the stable state of the vehicle according to the real-time rotating speed and the real-time torque.
In a possible implementation manner, the target rotation speed determination unit is further configured to:
and if the time length of the vehicle in the stable state does not exceed a preset time threshold, taking the current rotating speed of the fan as the target rotating speed.
In a third aspect, an electronic device is provided, comprising a processor and a memory, wherein the memory stores program code, which when executed by the processor, causes the processor to perform the steps of any of the above fan control methods.
In a fourth aspect, a computer-readable storage medium is provided, in which a computer program is stored, and the computer program, when executed by a processor, implements the fan control method of any one of the above.
For technical effects brought by any one implementation manner of the second aspect to the fourth aspect, reference may be made to the technical effects brought by the implementation manner of the first aspect, and details are not described here.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic diagram of fan speed fluctuations of the related art;
fig. 2 is a schematic flowchart of a fan control method according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram illustrating fan speed fluctuations of a fan control method according to an embodiment of the present disclosure;
FIG. 4 is a flow chart illustrating another fan control method according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a fan control device according to an embodiment of the present disclosure;
FIG. 6 is a schematic structural diagram of another fan control apparatus according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of another fan control apparatus according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the present application clearer, the present application will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Some terms in the embodiments of the present application are explained below to facilitate understanding by those skilled in the art.
(1) An ECU: (Electronic Control Unit ): the ECU, also called an "engine electronic control unit", is a controller that performs calculation, processing, and judgment based on signals input from various sensors, and then outputs commands to control the operation of an actuator.
(2) Loading: the load is the proportion of the actual torque of the engine in the running speed to the maximum torque, namely the ratio of the torque emitted under a part of throttle valves to the maximum torque emitted when the throttle valves are fully opened under the same engine speed.
(3) A rack: the test equipment for calibrating the engine is used for calibrating various performance parameters of the engine, including the engine speed, the engine torque, the fuel injection quantity, the emission and the like.
(4) CFD (Computational Fluid Dynamics): CFD is the product of a combination of modern hydrodynamics, numerical mathematics and computer science, a powerful cross-science. The method is characterized in that integral and differential terms in a fluid mechanics control equation are approximately expressed into a discrete algebraic form to form an algebraic equation set, and then the discrete algebraic equation set is solved through a computer to obtain a numerical solution on discrete time/space points.
In order to reduce the occurrence of frequent starting and stopping of the rotating speed of the fan in the running process of a real vehicle and reduce the power consumption of the fan, the embodiment of the application provides a fan control method, a device, electronic equipment and a medium. In order to better understand the technical solutions provided by the embodiments of the present application, the basic principles of the solutions are briefly described here.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be implemented in sequences other than those illustrated or described herein. The implementations described in the following exemplary examples do not represent all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the application, as detailed in the appended claims.
The technical solutions provided by the embodiments of the present application are described below with reference to the accompanying drawings.
In the running process of the vehicle, the engine can generate a large amount of heat, and the engine needs to be cooled by cooling liquid in the engine so as to ensure the normal running of the vehicle.
At present, a vehicle control system can cool an engine through a coolant by controlling a fan according to the temperature of the engine. The conventional fan control is generally performed with the actual water temperature as a target, and as shown in fig. 1, since the fluctuation of the water temperature is large, when the fan control is performed with the actual water temperature as a target, the fluctuation of the rotation speed of the fan is also large, and the power consumption of the fan is high.
In view of this, embodiments of the present application provide a fan control method, apparatus, electronic device, and medium, wherein when a duration that a vehicle is in a steady state exceeds a preset time threshold, a target rotation speed of a fan is determined according to a reference rotation speed and a reference torque; in a stable state, the fluctuation range of the real-time rotating speed of the vehicle relative to the reference rotating speed does not exceed a preset first fluctuation threshold value, and the fluctuation range of the real-time torque of the vehicle relative to the reference torque does not exceed a preset second fluctuation threshold value; the reference rotating speed is the rotating speed when the vehicle enters a stable state; the reference torque is the torque when the vehicle enters a stable state; the fan is adjusted based on the target speed. According to the method, the rotating speed of the fan is controlled according to the load of the vehicle in the stable state based on the monitored duration of the vehicle in the stable state, the rotating speed of the fan can be controlled according to the stable heat dissipation requirement of the vehicle, the frequent starting and stopping of the rotating speed of the fan in the running process of the actual vehicle can be reduced, and the power consumption of the fan is reduced.
The preferred embodiments of the present application will be described below with reference to the accompanying drawings of the specification, it should be understood that the preferred embodiments described herein are merely for illustrating and explaining the present application, and are not intended to limit the present application, and that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The fan control method provided in the embodiments of the present application is further explained below. As shown in fig. 2, the method comprises the following steps:
s201, if the time length of the vehicle in the stable state exceeds a preset time threshold, determining the target rotating speed of the fan according to the reference rotating speed and the reference torque.
In a stable state, the fluctuation range of the real-time rotating speed of the vehicle relative to the reference rotating speed does not exceed a preset first fluctuation threshold value, and the fluctuation range of the real-time torque of the vehicle relative to the reference torque does not exceed a preset second fluctuation threshold value; the reference rotating speed is the rotating speed when the vehicle enters a stable state; the reference torque is a torque at which the vehicle enters a steady state.
In particular, the first fluctuation threshold and the second fluctuation threshold may be the same or different. For example, the first fluctuation threshold and the second fluctuation threshold may both be 10%; it is also possible that the first fluctuation threshold and the second fluctuation threshold are 10% and 5%, respectively. It is to be understood that the present application does not specifically limit the specific values of the first fluctuation threshold and the second fluctuation threshold.
The steady state Wi can be represented by a reference rotation Speed _ i, a reference Torque _ i and a system Time Time _ i for entering the steady state Wi corresponding to the steady state Wi.
For example, assuming that the preset time threshold is 5 seconds, and the first fluctuation threshold and the second fluctuation threshold are both 10%, in particular implementation, the ECU of the vehicle may continuously monitor the steady state Wi of the vehicle, and if the vehicle is in the current steady state Wn for a period of time longer than 5 seconds, determine the target rotation Speed of the fan according to the reference rotation Speed _ n and the reference Torque _ n corresponding to the current steady state Wn. In the current stable state, the fluctuation amplitude of the real-time rotating Speed of the vehicle relative to the reference rotating Speed _ n is not more than 10%, and the fluctuation amplitude of the real-time Torque of the vehicle relative to the reference Torque Speed _ n is not more than 10%; the reference rotating Speed Speed _ n is the rotating Speed when the vehicle enters a stable state Torque _ n; the reference Torque _ n is a load when the vehicle enters the steady state Torque _ n.
In one possible implementation manner, the target rotation speed of the fan is determined according to the reference rotation speed and the reference torque, specifically: and determining a target rotating speed corresponding to the reference rotating speed and the reference torque according to a preset first corresponding relation between the rotating speed value and the torque value and the rotating speed of the fan.
The preset first corresponding relationship between the rotation speed value and the rotation speed of the fan is a pre-established corresponding relationship table of the rotation speed, the torque and the rotation speed of the fan, and is shown in table 1.
For example, the first corresponding relationship may be a corresponding relationship table as shown in table 1, and assuming that the reference rotation speed is 800r/min and the reference torque is 600Nm, the target rotation speed 2126r/min corresponding to the reference rotation speed 800r/min and the reference torque 600Nm is determined according to the preset first corresponding relationship between the rotation speed value, the torque value and the fan rotation speed shown in table 1.
TABLE 1
| Rotation speed value (r/min) | Torque value (Nm) | Fan speed (r/min) |
| … | … | … |
| 800 | 600 | 2126 |
| 1200 | 1000 | 2650 |
| … | … | … |
In one possible implementation, if the fluctuation range of the real-time rotation speed of the vehicle relative to the reference rotation speed exceeds a preset first fluctuation threshold value, or the fluctuation range of the real-time torque of the vehicle relative to the reference torque exceeds a preset second fluctuation threshold value, the stable state of the vehicle is determined again according to the real-time rotation speed and the real-time torque.
Illustratively, the ECU of the vehicle continuously monitors the vehicle's steady state Wi, real-Time speed _ N _ t, real-Time Torque _ N _ t, current system Time _ N _ t, assuming that the preset Time threshold is 5 seconds; the first fluctuation threshold and the second fluctuation threshold are both 10%; the current stable state is Wn; the reference rotating Speed corresponding to the current stable state Wn is Speed _ n, the reference Torque is Torque _ n, and the system Time Time _ n for entering the stable state Wn is obtained; and if the fluctuation amplitude of the real-time rotating Speed _ N _ t of the vehicle relative to the reference rotating Speed _ N exceeds 10 percent, or the fluctuation amplitude of the real-time Torque Speed _ N _ t of the vehicle relative to the reference Torque Speed _ N exceeds 10 percent, re-determining the stable state Wn +1 of the vehicle according to the real-time rotating Speed _ N _ t and the real-time Torque Speed _ N _ t. Taking the stable state Wn +1 as the current stable state, wherein the reference rotating speed corresponding to the stable state Wn +1 is speed _ N _ t, the reference Torque is Torque _ N _ t, and the system Time for entering the stable state Wn +1 is Time _ N _ t.
In a possible implementation manner, the first corresponding relationship may be obtained by the following steps:
step A01, a plurality of sets of calibrated operating parameters of the vehicle are determined.
The calibration operation parameters comprise a calibration rotating speed, a calibration torque and a calibration vehicle speed of the vehicle when the fluctuation of the rotating speed of the fan exceeds a preset third fluctuation threshold value.
And the third fluctuation threshold is the same as or different from the first fluctuation threshold and the second fluctuation threshold. In the embodiment of the present application, the third fluctuation threshold may be flexibly set as required.
For example, in some embodiments, in order to obtain the preset first corresponding relationship between the rotation speed value and the torque value and the fan rotation speed, the torque and the rotation speed of the engine and the vehicle speed of the vehicle at the time of the large fan rotation speed fluctuation are firstly found through big data analysis, so as to obtain multiple sets of calibrated operating parameters of the vehicle.
And A02, determining the calibrated rotating speed of the fan corresponding to each calibrated operating parameter according to the finished automobile resistance parameter obtained by simulation and the second corresponding relation of the preset rotating speed value, the preset torque value and the heat dissipation capacity.
The second preset corresponding relation among the rotating speed value, the torque value and the heat dissipation capacity is a data curve chart of the heat dissipation capacity of the engine.
The engine heat dissipation capacity has a data curve chart, and is concrete data with the X axis as the engine rotating speed, the Y axis as the engine torque and the Z axis as the heat dissipation capacity. Therefore, as long as the data of the engine rotating speed and the engine torque exist, the heat dissipation capacity of the engine can be checked to obtain the current heat dissipation capacity.
Illustratively, acquiring a whole vehicle resistance parameter of the vehicle through CFD simulation; the heat dissipation capacity of the engine needing to be dissipated by cooling liquid is obtained through a universal data curve chart of the heat dissipation capacity of the engine, and the wind speed and the fan rotating speed required by the target water temperature are obtained through simulation of a whole vehicle system.
And step A03, obtaining a first corresponding relation according to the calibration operation parameters and the calibration rotating speed.
Illustratively, a corresponding relation table of the rotating speed, the torque and the fan is obtained by combining the torque and the rotating speed of the engine, the rotating speed of the engine and the vehicle speed when the fluctuation of the rotating speed of the fan is large, which are found through big data analysis, and the rotating speed of the fan, which is obtained through simulation of a whole vehicle system and is required to reach a target water temperature, and the corresponding relation table is written into an engine ECU.
In a possible implementation manner, the calibrated rotating speed of the fan corresponding to each calibrated operating parameter is determined according to the second corresponding relationship between the vehicle resistance parameter and the preset rotating speed value, the preset torque value and the heat dissipation capacity, and the method can be specifically implemented by the following steps:
and B01, determining the calibrated heat dissipation capacity corresponding to the calibrated operation parameters according to the preset second corresponding relation among the rotating speed value, the torque value and the heat dissipation capacity.
Wherein the calibrated heat dissipation represents a total heat dissipation required by the vehicle.
Specifically, the second corresponding relationship between the preset rotation speed value, the preset torque value and the heat dissipation capacity is a data curve of the heat dissipation capacity of the engine.
The engine heat dissipation capacity universal data curve chart is a concrete data with the X axis as the engine rotating speed, the Y axis as the engine torque and the Z axis as the heat dissipation capacity. Therefore, if the engine speed and the engine torque are provided, the heat dissipation capacity of the engine can be checked to obtain a data curve graph, and the current heat dissipation capacity is used as the total heat dissipation capacity HDC _ T _ j required by the vehicle.
And B02, determining the calibrated natural heat dissipation according to the whole vehicle resistance parameter and the calibrated vehicle speed.
And the calibrated natural heat dissipation capacity represents the heat dissipation capacity of the wind flowing through the surface of the vehicle on the cooling liquid.
The vehicle speed influences the air inlet speed of the front side of the whole vehicle, and the higher the vehicle speed is, the higher the air inlet speed of the front side of the whole vehicle is, and the slower the fan can rotate.
During specific implementation, the whole vehicle system simulation is carried out according to the whole vehicle resistance parameter and the calibrated vehicle speed obtained by the CFD simulation, the heat dissipation capacity of the cooling liquid generated by the wind flowing through the surface of the vehicle can be determined, and the calibrated natural heat dissipation capacity HDC _ N _ j is obtained.
B03, determining the heat dissipation capacity of the fan according to the calibrated heat dissipation capacity and the calibrated natural heat dissipation capacity; the heat dissipation capacity of the fan represents the heat dissipation capacity of the wind of the fan on the cooling liquid.
During specific implementation, the heat dissipation capacity of the cooling liquid generated by the wind of the fan is determined according to the calibrated heat dissipation capacity and the calibrated natural heat dissipation capacity, and the heat dissipation capacity HDC _ P _ j of the fan is obtained. The fan heat dissipation HDC _ P _ j can be calculated by the following formula:
HDC_P_j＝HDC_T_j-HDC_N_j，
wherein,
HDC _ T _ j is the total heat dissipation required by the vehicle;
HDC _ N _ j is the calibrated natural heat dissipation.
And B04, determining the calibrated fan rotating speed corresponding to the calibrated operation parameter according to the heat dissipation capacity of the fan.
Specifically, according to the heat dissipation capacity of the fan, the rotating speed of the fan required by the heat dissipation capacity of the fan is obtained through simulation of the whole vehicle system.
In one possible implementation, to adjust the fan based on the target speed, if the vehicle is in a steady state for a period of time that does not exceed a preset time threshold, the current speed of the fan is taken as the target speed.
For example, assuming that the preset time threshold is 5 seconds and the current rotation speed of the fan is 2650r/min, if the vehicle is in the current steady state for no more than 5 seconds, the current rotation speed of the fan 2650r/min is taken as the target rotation speed.
And S202, adjusting the fan based on the target rotating speed.
In particular implementations, the vehicle ECU adjusts the speed of the fan to the determined target speed.
Illustratively, assuming that the determined target rotational speed is 2126r/min, the vehicle ECU adjusts the rotational speed of the fan to 2126r/min according to the value of the target rotational speed.
According to the fan control method, the rotating speed of the fan is controlled according to the load of the vehicle in the stable state, the rotating speed of the fan can be controlled according to the stable heat dissipation requirement of the vehicle, the frequent starting and stopping of the rotating speed of the fan in the running process of the actual vehicle can be reduced, the improved fluctuation curve of the rotating speed of the fan is shown in figure 3, and the power consumption of the fan can be obviously reduced.
The fan control method shown in fig. 2 determines the target rotation speed of the fan according to the reference rotation speed and the reference torque when the duration that the vehicle is in the steady state exceeds the preset time threshold; in a stable state, the fluctuation range of the real-time rotating speed of the vehicle relative to the reference rotating speed does not exceed a preset first fluctuation threshold value, and the fluctuation range of the real-time torque of the vehicle relative to the reference torque does not exceed a preset second fluctuation threshold value; the reference rotating speed is the rotating speed when the vehicle enters a stable state; the reference torque is the torque when the vehicle enters a steady state; the fan is adjusted based on the target speed. According to the method, the rotating speed of the fan is controlled according to the load of the vehicle in the stable state based on the monitored duration of the vehicle in the stable state, the rotating speed of the fan can be controlled according to the stable heat dissipation requirement of the vehicle, the frequent starting and stopping of the rotating speed of the fan in the running process of the actual vehicle can be reduced, and the power consumption of the fan is reduced.
Another fan control method provided in the embodiment of the present application is described below. As shown in fig. 4, the fan control method includes the following steps:
step S401, determining multiple groups of calibrated operating parameters of the vehicle.
The calibration operation parameters comprise a calibration rotating speed, a calibration torque and a calibration vehicle speed of the vehicle when the fluctuation of the rotating speed of the fan exceeds a preset third fluctuation threshold value.
In some embodiments, multiple sets of calibrated operating parameters of the vehicle are determined by a method of big data analysis.
And S402, obtaining the finished automobile resistance parameter through simulation.
Wherein, the simulation of the whole vehicle resistance parameter can be CFD simulation.
And S403, determining the calibrated rotating speed of the fan corresponding to each calibrated operating parameter through the whole vehicle system simulation according to the preset second corresponding relation between the rotating speed value, the torque value and the heat dissipating capacity.
The second corresponding relation between the preset rotating speed value, the preset torque value and the heat dissipation capacity is a data curve graph of the heat dissipation capacity of the engine.
Specifically, a universal data curve graph of the heat dissipation capacity of the engine is inquired, heat dissipation capacity information required for reaching a preset target water temperature is obtained through whole vehicle system simulation, and the calibration rotating speed of the fan corresponding to each calibration operating parameter is determined.
And S404, obtaining a first corresponding relation according to the calibration operation parameters and the calibration rotating speed.
The first corresponding relation is the corresponding relation between the preset rotating speed value, the preset torque value and the rotating speed of the fan.
Step S405, monitoring the stable state of the vehicle according to the real-time rotating speed and the real-time torque of the vehicle, determining the target rotating speed of the fan according to the reference rotating speed and the reference torque, and determining that the time length of the vehicle in the stable state exceeds a preset time threshold. If yes, go to step S406; if not, go to step S407.
Specifically, the stable state of the vehicle is monitored according to the real-time rotating speed and the real-time torque of the vehicle, the target rotating speed of the fan is determined according to the reference rotating speed and the reference torque, and the time length of the vehicle in the stable state is determined to exceed a preset time threshold. In a stable state, the fluctuation range of the real-time rotating speed of the vehicle relative to the reference rotating speed does not exceed a preset first fluctuation threshold value, and the fluctuation range of the real-time torque of the vehicle relative to the reference torque does not exceed a preset second fluctuation threshold value; the reference rotating speed is the rotating speed when the vehicle enters a stable state; the reference torque is a torque at which the vehicle enters a steady state. And if the fluctuation range of the real-time rotating speed of the vehicle relative to the reference rotating speed exceeds a preset first fluctuation threshold value, or the fluctuation range of the real-time torque of the vehicle relative to the reference torque exceeds a preset second fluctuation threshold value, re-determining the stable state of the vehicle according to the real-time rotating speed and the real-time torque.
Optionally, the preset time threshold is 5 s.
In step S406, the rotation speed of the fan is adjusted to the target rotation speed.
Specifically, when the system detects that the whole vehicle runs at the set rotating speed and the set torque for more than a preset time threshold, the whole vehicle is considered to have a constant heat dissipation requirement, the rotating speed of the fan is adjusted to the set rotating speed, and sudden rising and sudden falling of the rotating speed of the fan caused only by water temperature change are avoided.
In step S407, the fan is maintained at the rotational speed before the fan.
Specifically, the fan is maintained at the rotation speed before the fan, and the rotation speed of the fan is maintained.
The process of controlling the fans in steps S401 to S407 may be executed by referring to the specific process of the foregoing embodiment, and the same parts are not described herein again.
The fan control method is simple and easy to implement, achieves the purpose of fan control through ECU program setting, optimizes the control rotating speed of the fan and can reduce the power consumption of the fan by 50 percent.
Based on the same inventive concept, the embodiment of the application also provides a fan control device. As shown in fig. 5, the apparatus includes:
a target rotation speed determination unit 501, configured to determine a target rotation speed of the fan according to the reference rotation speed and the reference torque when a duration that the vehicle is in the steady state exceeds a preset time threshold; in a stable state, the fluctuation range of the real-time rotating speed of the vehicle relative to the reference rotating speed does not exceed a preset first fluctuation threshold value, and the fluctuation range of the real-time torque of the vehicle relative to the reference torque does not exceed a preset second fluctuation threshold value; the reference rotating speed is the rotating speed when the vehicle enters a stable state; the reference torque is the torque when the vehicle enters a steady state;
a fan adjusting unit 502 for adjusting the fan based on the target rotation speed.
In a possible implementation manner, the target rotation speed determining unit 501 is specifically configured to:
and determining a target rotating speed corresponding to the reference rotating speed and the reference torque according to a preset first corresponding relation between the rotating speed value and the torque value and the rotating speed of the fan.
In a possible implementation manner, as shown in fig. 6, the method further includes a relationship building unit 601, where the relationship building unit 601 is configured to:
determining a plurality of groups of calibrated operating parameters of the vehicle; the calibration operation parameters comprise a calibration rotating speed, a calibration torque and a calibration vehicle speed of the vehicle when the fluctuation of the rotating speed of the fan exceeds a preset third fluctuation threshold;
according to the finished automobile resistance parameter obtained through simulation and a second corresponding relation of a preset rotating speed value, a preset torque value and a preset heat dissipation amount, determining the calibrated rotating speed of the fan corresponding to each calibrated operating parameter;
and obtaining a first corresponding relation according to the calibration operation parameters and the calibration rotating speed.
In a possible implementation manner, the relationship building unit 601 is specifically configured to:
determining a calibration heat dissipation amount corresponding to the calibration operation parameter according to a second corresponding relation between the preset rotating speed value, the preset torque value and the heat dissipation amount; calibrating the heat dissipation capacity to represent the total heat dissipation capacity required by the vehicle;
determining the calibrated natural heat dissipating capacity according to the resistance parameter of the whole vehicle and the calibrated speed; calibrating natural heat dissipation capacity to represent the heat dissipation capacity of the cooling liquid generated by the wind flowing through the surface of the vehicle;
determining the heat dissipating capacity of the fan according to the calibrated heat dissipating capacity and the calibrated natural heat dissipating capacity; the heat dissipation capacity of the fan represents the heat dissipation capacity of the cooling liquid generated by the wind of the fan;
and determining the calibrated fan rotating speed corresponding to the calibrated operating parameter according to the heat dissipation capacity of the fan.
In a possible implementation manner, as shown in fig. 7, the system further includes a stable state monitoring unit 701, where the stable state monitoring unit 701 is configured to:
and if the fluctuation range of the real-time rotating speed of the vehicle relative to the reference rotating speed exceeds a preset first fluctuation threshold value, or the fluctuation range of the real-time torque of the vehicle relative to the reference torque exceeds a preset second fluctuation threshold value, re-determining the stable state of the vehicle according to the real-time rotating speed and the real-time torque.
In one possible implementation, the target rotation speed determination unit 501 is further configured to:
and if the duration of the vehicle in the stable state does not exceed the preset time threshold, taking the current rotating speed of the fan as the target rotating speed.
Based on the same technical concept, embodiments of the present application further provide an electronic device, as shown in fig. 8, the electronic device is configured to implement the methods described in the above method embodiments, for example, implement the method shown in fig. 2, and the electronic device may include a memory 801, a processor 802, an input unit 803, and a display panel 804.
A memory 801 for storing computer programs executed by the processor 802. The memory 801 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function, and the like; the storage data area may store data created according to use of the electronic device, and the like. The processor 802 may be a Central Processing Unit (CPU), a digital processing unit, or the like. An input unit 803 may be used to obtain a user instruction input by a user. The display panel 804 is configured to display information input by a user or information provided to the user, and in this embodiment of the present application, the display panel 804 is mainly used to display a display interface of each application program in the terminal device and a control entity displayed in each display interface. Alternatively, the display panel 804 may be configured in the form of a Liquid Crystal Display (LCD) or an organic light-emitting diode (OLED), and the like.
The embodiment of the present application does not limit the specific connection medium among the memory 801, the processor 802, the input unit 803, and the display panel 804. In the embodiment of the present application, the memory 801, the processor 802, the input unit 803, and the display panel 804 are connected by the bus 805 in fig. 8, the bus 805 is shown by a thick line in fig. 8, and the connection manner between the other components is merely illustrative and not limited thereto. The bus 805 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 8, but that does not indicate only one bus or one type of bus.
The memory 801 may be a volatile memory (volatile memory), such as a random-access memory (RAM); the memory 801 may also be a non-volatile memory (non-volatile memory) such as, but not limited to, a read-only memory (rom), a flash memory (flash memory), a hard disk (HDD) or a solid-state drive (SSD), or the memory 801 may be any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory 801 may be a combination of the above memories.
A processor 802 for invoking a computer program stored in the memory 801 to perform the embodiment as shown in fig. 2.
The embodiment of the present application further provides a computer-readable storage medium, which stores computer-executable instructions required to be executed by the processor, and includes a program required to be executed by the processor.
In some possible embodiments, aspects of a fan control method provided by the present application may also be implemented in the form of a program product including program code for causing a terminal device to perform the steps of a fan control method according to various exemplary embodiments of the present application described above in this specification when the program product is run on the terminal device. For example, the electronic device may perform the embodiment as shown in fig. 2.
The program product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
A fan control program product for an embodiment of the present application may employ a portable compact disk read-only memory (CD-ROM) and include program code, and may be run on a computing device. However, the program product of the present application is not so limited, and in this document, a readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A readable signal medium may include a propagated data signal with readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A readable signal medium may also be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Program code for carrying out operations of the present application may be written in any combination of one or more programming languages, including a physical oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server. In situations involving remote computing devices, the remote computing devices may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to external computing devices (e.g., through the internet using an internet service provider).
It should be noted that although several units or sub-units of the apparatus are mentioned in the above detailed description, such division is merely exemplary and not mandatory. Indeed, the features and functions of two or more units described above may be embodied in one unit, according to embodiments of the application. Conversely, the features and functions of one unit described above may be further divided into embodiments by a plurality of units.
Further, while the operations of the methods of the present application are depicted in the drawings in a particular order, this does not require or imply that these operations must be performed in this particular order, or that all of the illustrated operations must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable document processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable document processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable document processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable document processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A method of controlling a fan, the method comprising:
if the duration of the vehicle in the stable state exceeds a preset time threshold, determining the target rotating speed of the fan according to the reference rotating speed and the reference torque; in the steady state, the fluctuation range of the real-time rotating speed of the vehicle relative to the reference rotating speed does not exceed a preset first fluctuation threshold value, and the fluctuation range of the real-time torque of the vehicle relative to the reference torque does not exceed a preset second fluctuation threshold value; the reference rotation speed is a rotation speed of the vehicle when the vehicle enters the steady state; the reference torque is a torque at which the vehicle enters the steady state;
adjusting the fan based on the target speed.
2. The method of claim 1, wherein determining a target speed of the fan based on the reference speed and the reference torque comprises:
and determining the target rotating speed corresponding to the reference rotating speed and the reference torque according to a first corresponding relation of a preset rotating speed value, a preset torque value and a preset fan rotating speed.
3. The method of claim 2, wherein the first correspondence is obtained by:
determining a plurality of sets of calibrated operating parameters of the vehicle; the calibration operation parameters comprise a calibration rotating speed, a calibration torque and a calibration vehicle speed of the vehicle when the fluctuation of the rotating speed of the fan exceeds a preset third fluctuation threshold;
according to the finished automobile resistance parameter obtained through simulation and a second corresponding relation of a preset rotating speed value, a preset torque value and a preset heat dissipation amount, determining the calibrated rotating speed of the fan corresponding to each calibrated operating parameter; the heat dissipating capacity is the total heat dissipating capacity required by the whole vehicle;
and obtaining the first corresponding relation according to the calibration operation parameters and the calibration rotating speed.
4. The method according to claim 3, wherein determining the calibrated rotational speed of the fan corresponding to each of the calibrated operating parameters according to the vehicle resistance parameter and the second corresponding relationship between the preset rotational speed value, the preset torque value and the preset heat dissipation capacity comprises:
determining a calibration heat dissipation amount corresponding to the calibration operation parameter according to a second corresponding relation between a preset rotating speed value, a preset torque value and the heat dissipation amount; the calibrated heat dissipation capacity represents the total heat dissipation capacity required by the vehicle;
determining calibrated natural heat dissipation according to the finished automobile resistance parameter and the calibrated speed; the calibrated natural heat dissipation capacity represents the heat dissipation capacity of the wind flowing through the surface of the vehicle on the cooling liquid;
determining the heat dissipation capacity of the fan according to the calibrated heat dissipation capacity and the calibrated natural heat dissipation capacity; the heat dissipation capacity of the fan represents the heat dissipation capacity of the wind of the fan on the cooling liquid;
and determining the calibrated fan rotating speed corresponding to the calibrated operating parameter according to the heat dissipating capacity of the fan.
5. The method according to any one of claims 1-4, further comprising:
and if the fluctuation range of the real-time rotating speed of the vehicle relative to the reference rotating speed exceeds a preset first fluctuation threshold value, or the fluctuation range of the real-time torque of the vehicle relative to the reference torque exceeds a preset second fluctuation threshold value, re-determining the stable state of the vehicle according to the real-time rotating speed and the real-time torque.
6. The method of claim 5, wherein prior to said adjusting said fan based on said target speed, further comprising:
and if the time length of the vehicle in the stable state does not exceed a preset time threshold, taking the current rotating speed of the fan as the target rotating speed.
7. A fan control apparatus, the apparatus comprising:
the target rotating speed determining unit is used for determining the target rotating speed of the fan according to the reference rotating speed and the reference torque when the time length of the vehicle in the stable state exceeds a preset time threshold; in the steady state, the fluctuation range of the real-time rotating speed of the vehicle relative to the reference rotating speed does not exceed a preset first fluctuation threshold value, and the fluctuation range of the real-time torque of the vehicle relative to the reference torque does not exceed a preset second fluctuation threshold value; the reference rotation speed is a rotation speed of the vehicle when the vehicle enters the steady state; the reference torque is a torque at which the vehicle enters the steady state;
a fan adjustment unit for adjusting the fan based on the target rotation speed.
8. The apparatus according to claim 7, wherein the target rotational speed determination unit is specifically configured to:
and determining the target rotating speed corresponding to the reference rotating speed and the reference torque according to a first corresponding relation of a preset rotating speed value, a preset torque value and a preset fan rotating speed.
9. An electronic device, comprising a processor and a memory, wherein the memory stores program code which, when executed by the processor, causes the processor to perform the steps of the method of any of claims 1-6.
10. A computer-readable storage medium having a computer program stored therein, the computer program characterized by: the computer program, when executed by a processor, implements the method of any of claims 1-6.
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