CN113761656A - Method and device for estimating initial temperature of clutch during vehicle starting and storage medium - Google Patents
Method and device for estimating initial temperature of clutch during vehicle starting and storage medium Download PDFInfo
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Abstract
The invention discloses a method, a device and a storage medium for estimating the initial temperature of a clutch during vehicle starting, which relate to the technical field of estimation and judgment of the temperature of the clutch of a vehicle, and the method for estimating the initial temperature of the clutch during vehicle starting comprises the following steps: determining the interval time from the power-off of the vehicle to the power-on again and the flameout time; when the interval time is not less than the flameout time, taking the ambient temperature when the power is re-electrified as the initial temperature of the clutch; and when the interval time is less than the flameout time, determining the initial temperature of the clutch according to the difference between the clutch temperature and the ambient temperature when the power is off, the cooling coefficient of the clutch and the ambient temperature when the power is on again. The method can effectively solve the problem that the difference between the clutch temperature and the ambient temperature stored in the previous flameout process is used for calculating the error caused by the clutch initial temperature in the next starting process, and improves the estimation accuracy of the clutch initial temperature.
Description
Technical Field
The invention relates to the technical field of estimation and judgment of the temperature of a vehicle clutch, in particular to a method and a device for estimating the initial temperature of the clutch when a vehicle starts and a storage medium.
Background
The clutch is positioned in a flywheel shell between the engine and the gearbox, the clutch assembly is fixed on the rear plane of the flywheel by screws, and the output shaft of the clutch is the input shaft of the gearbox. During the running of the automobile, the driver can press or release the clutch pedal according to the requirement, so that the engine and the gearbox are temporarily separated and gradually jointed, and the power input by the engine to the gearbox is cut off or transmitted.
Clutches are common components in mechanical transmissions, and allow the transmission to be disengaged or engaged at any time. The basic requirements for it are: the joint is stable, and the separation is rapid and thorough; the adjustment and the repair are convenient; the overall size is small; the mass is small; good wear resistance and enough heat dissipation capability.
The existing commonly used double clutches are divided into a dry clutch and a wet clutch, the dry clutch only uses air cooling for heat dissipation, the heat capacity is low, and the clutches cannot be in a friction state for a long time.
Because the clutch is separated and combined for a short time, frequent separation and combination easily cause the local temperature of the clutch to be overhigh, and if the temperature is overhigh and exceeds the bearing capacity of the dry clutch, the phenomena of clutch ablation and the like easily occur. To prevent the clutch temperature from being too high, the clutch temperature must be monitored in real time.
However, in the prior art, the initial temperature of the clutch at the time of restarting the vehicle is determined, and is mainly calculated from the temperature difference between the clutch temperature stored at the last key-off and the ambient temperature, and the calculation error is large in this way. The initial temperature of the clutch is also related to the time elapsed since the last shutdown to restart, and if the time is too short, a large error will result.
Disclosure of Invention
Aiming at the defects in the prior art, the first aspect of the invention provides a method for estimating the initial temperature of the clutch during the starting of the vehicle, which can effectively solve the problem that the error caused by calculating the initial temperature of the clutch during the next starting by the difference between the clutch temperature stored during the previous flameout and the ambient temperature, and improves the estimation accuracy of the initial temperature of the clutch.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a method of estimating an initial clutch temperature at vehicle start, the method comprising the steps of:
determining the interval time from the power-off of the vehicle to the power-on again and the flameout time;
when the interval time is not less than the flameout time, taking the ambient temperature when the power is re-electrified as the initial temperature of the clutch;
and when the interval time is less than the flameout time, determining the initial temperature of the clutch according to the difference between the clutch temperature and the ambient temperature when the power is off, the cooling coefficient of the clutch and the ambient temperature when the power is on again.
In some embodiments, determining the initial temperature of the clutch based on the difference between the clutch temperature and the ambient temperature when powering down, the cooling coefficient of the clutch, and the ambient temperature when powering back up when the interval is less than the key-off time comprises:
obtaining clutch temperature T at power-offc_KeyOffAnd ambient temperature Tamb_KeyOff；
Determining the cooling coefficient b of the clutch according to the type of the vehicle and the type of the clutch materialc；
Obtaining an ambient temperature T at power-upamb_KeyOn；
According to the formula: t isc_KeyOn＝(Tc_KeyOff-Tamb_KeyOff)×exp(-time/bc)+Tamb_KeyOnCalculating the initial temperature T of the clutchc_KeyOn。
In some embodiments, the cooling coefficient bc∈[110，130]。
In some embodiments, the time interval that elapses after the vehicle is powered down to powered up again is determined by a clock or timer.
In some embodiments, the flameout time is 7000 to 9000 s.
According to the method for estimating the initial temperature of the clutch during vehicle starting, the initial temperature of the clutch is estimated again after short-time power-off by adopting the difference between the clutch temperature stored during last power-off and the environment temperature during power-on again, so that the error caused by calculating the initial temperature of the clutch during next starting by the difference between the clutch temperature stored during last power-off and the environment temperature can be effectively solved, and the estimation accuracy of the initial temperature of the clutch is improved. The initial temperature is estimated by utilizing the flameout time, when the interval time is longer, the initial temperature of the clutch after being electrified again is directly equal to the ambient temperature, the computation amount of a TCU (Transmission Control Unit) can be reduced, and the utilization rate of the running memory is improved.
A second aspect of the present invention provides a computer-readable storage medium for storing a computer program or instructions, which when executed on a computer, enables any one of the above methods to effectively solve the error caused by calculating the clutch initial temperature at the next start by using the difference between the clutch temperature stored at the previous shutdown and the ambient temperature, thereby improving the accuracy of estimating the clutch initial temperature.
The third aspect of the present invention provides a clutch initial temperature estimation device during vehicle start, which can effectively solve the problem that the difference between the clutch temperature stored during previous flameout and the ambient temperature is used to calculate the error caused by the clutch initial temperature during the next start, and improve the accuracy of clutch initial temperature estimation.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
an initial clutch temperature estimating apparatus at vehicle start-up, comprising:
the timing module is used for determining the interval time from the power-off of the vehicle to the power-on again and the flameout time;
a computing module to: when the interval time is not less than the flameout time, taking the ambient temperature when the power is re-electrified as the initial temperature of the clutch; and when the interval time is less than the flameout time, determining the initial temperature of the clutch according to the difference between the clutch temperature and the ambient temperature when the power is off, the cooling coefficient of the clutch and the ambient temperature when the power is on again.
In some embodiments, when the interval time is less than the flame-out time, the calculation module is to:
obtaining clutch temperature T at power-offc_KeyOffAnd ambient temperature Tamb_KeyOff；
Determining the cooling coefficient b of the clutch according to the type of the vehicle and the type of the clutch materialc；
Obtaining an ambient temperature T at power-upamb_KeyOn；
According to the formula: t isc_KeyOn＝(Tc_KeyOff-Tamb_KeyOff)×exp(-time/bc)+Tamb_KeyOnCalculating the initial temperature T of the clutchc_KeyOn。
In some embodiments, the cooling coefficient bc∈[110，130]。
In some embodiments, the time interval from the vehicle powering down to the vehicle powering up again is determined by the calculation module through a clock or a timer.
The device for estimating the initial temperature of the clutch during the vehicle starting adopts the difference between the clutch temperature stored during the last power-off and the environment temperature during the power-on again to estimate the initial temperature of the clutch after the power-on again in a short time, can effectively solve the problem that the error caused by the initial temperature of the clutch during the next starting is calculated by the difference between the clutch temperature stored during the previous power-off and the environment temperature, and improves the estimation accuracy of the initial temperature of the clutch. The initial temperature is estimated by utilizing the flameout time, and when the interval time is longer, the initial temperature of the clutch after being electrified again is directly equal to the ambient temperature, so that the calculation amount of the TCU can be reduced, and the utilization rate of the running memory is improved.
Drawings
FIG. 1 is a flow chart of a method for estimating clutch initial temperature at vehicle start-up in accordance with an embodiment of the present invention;
FIG. 2 is a logic diagram of a determination of the length of time a vehicle has been powered down in accordance with an embodiment of the present invention;
FIG. 3 is a logic diagram of an initial temperature estimate that is powered up again after a short power down period in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. 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.
The flow diagrams depicted in the figures are merely illustrative and do not necessarily include all of the elements and operations/steps, nor do they necessarily have to be performed in the order depicted. For example, some operations/steps may be decomposed, combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject matter of the present application can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the application.
The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.
The flow charts shown in the drawings are merely illustrative and do not necessarily include all of the contents and operations/steps, nor do they necessarily have to be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.
It should be noted that: reference herein to "a plurality" means two or more. "and/or" describe the association relationship of the associated objects, meaning that there may be three relationships, e.g., A and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
It is noted that the terms first, second and the like in the description and claims of the present 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 is to be understood that the objects so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in other sequences than those illustrated or described herein.
Referring to fig. 1, an embodiment of the present invention provides a method for estimating an initial clutch temperature at vehicle start-up, including the steps of:
s1, determining the interval time from powering off of the vehicle to powering on again and the flameout time.
In the present embodiment, the time interval from when the vehicle is powered off to when it is powered on again may be obtained by a clock or a timer. Flameout time KeyOffTime is a standard quantity, and different values are marked in combination with the vehicle type and the clutch material, and for example, 7000-9000 s can be realized. The significance of this is to determine if the interval time is large enough to allow the clutch to cool sufficiently, as a preferred embodiment, KeyOffTime may be scaled to 8000 s.
And S2, when the interval time is not less than the flameout time, taking the environment temperature when the power is supplied again as the initial temperature of the clutch.
And S3, when the interval time is less than the flameout time, determining the initial temperature of the clutch according to the difference between the temperature of the clutch and the ambient temperature when the clutch is powered off, the cooling coefficient of the clutch and the ambient temperature when the clutch is powered on again.
In this embodiment, if the interval time is not less than the flameout time, which means that the clutch cooling time is very long, the initial temperature after the clutch is powered up again can be considered to be equal to the ambient temperature when the clutch is powered up again.
If the interval time is less than the flameout time, the cooling time of the clutch is not enough, and at the moment, the initial temperature of the clutch needs to be determined by comprehensively considering the difference between the clutch temperature and the ambient temperature when the power is off, the cooling coefficient of the clutch and the ambient temperature when the power is on again.
Specifically, in the present embodiment, it is necessary to: obtaining clutch temperature T at power-offc_KeyOffAnd ambient temperature Tamb_KeyOff(ii) a Determining the cooling coefficient b of the clutch according to the type of the vehicle and the type of the clutch materialc(ii) a Obtaining an ambient temperature T at power-upamb_KeyOn(ii) a According to the formula: t isc_KeyOn＝(Tc_KeyOff-Tamb_KeyOff)×exp(-time/bc)+Tamb_KeyOnCalculating the initial temperature T of the clutchc_KeyOn。
The following is a specific implementation:
(1) and (3) judging the power-off time of the vehicle:
referring to fig. 2, first, a logical determination of the length of time the vehicle is powered down is made:
when time > is KeyOffTime, outputting flag to be 1; when time < KeyOffTime, output flag ═ 0.
(2) Powering up again after long-time power down:
if flag is 1, time is specified>When KeyOffTime is reached, it can be assumed that the clutch has cooled sufficiently, and therefore the initial clutch temperature T after power-up is resumedc_KeyOnCan be considered as being equal to the ambient temperature T measured by the temperature sensoramb_KeyOnI.e. Tc_KeyOn＝Tamb_KeyOn。
(3) Powering up again after short time power down for initial temperature:
if flag is equal to 0, time is specified<Keyofttime, then need to be calculated according to the principle formula: t isc_KeyOn＝(Tc_KeyOff-Tamb_KeyOff)×exp(-time/bc)+Tamb_KeyOnTo estimate the initial temperature T of the clutchc_KeyOnThe specific implementation is shown in fig. 3.
The initial temperature of the electric clutch is stored when the electric power is cut off last timec_KeyOffAnd ambient temperature Tamb_KeyOffAs a function of the temperature difference, i.e. the temperature difference (T)c_KeyOff-Tamb_KeyOff) And an exponential function exp (-time/b)c) Multiplying by the ambient temperature Tamb_KeyOnSumming to obtain the initial clutch temperature T after power-upc_KeyOn. Wherein b iscFor the cooling coefficient, it can be obtained by fitting according to the vehicle type in combination with the type of clutch material and experimental data, generally speaking, the cooling coefficient bc∈[110，130]B in this example obtained by fittingc＝120。
That is to say, in the embodiment, in order to determine the initial temperature of the clutch when the vehicle is started more accurately and efficiently, the flameout time is taken as a reference, and the situation is analyzed according to whether the interval time from the vehicle powering-off to the powering-on again exceeds the flameout time, so that on one hand, the situation is more suitable for the actual situation, and on the other hand, the calculation is simplified to a certain extent because the accurate calculation is required only when the interval time is not less than the flameout time.
In summary, according to the method for estimating the initial temperature of the clutch during the vehicle starting, the initial temperature of the clutch is re-electrified after being powered off for a short time is estimated by adopting the difference between the clutch temperature stored during the last powering off and the environment temperature during the re-powering on, so that the error caused by calculating the initial temperature of the clutch during the next starting by the difference between the clutch temperature stored during the last powering off and the environment temperature can be effectively solved, and the estimation accuracy of the initial temperature of the clutch is improved. The initial temperature is estimated by utilizing the flameout time, and when the interval time is longer, the initial temperature of the clutch after being electrified again is directly equal to the ambient temperature, so that the calculation amount of the TCU can be reduced, and the utilization rate of the running memory is improved.
Meanwhile, the embodiment of the invention also provides a device for estimating the initial temperature of the clutch when the vehicle starts, which comprises a timing module and a calculating module.
The timing module is used for determining the time interval from the power-off of the vehicle to the power-on of the vehicle again and the flameout time.
A computing module to: when the interval time is not less than the flameout time, taking the ambient temperature when the power is re-electrified as the initial temperature of the clutch; and when the interval time is less than the flameout time, determining the initial temperature of the clutch according to the difference between the clutch temperature and the ambient temperature when the power is off, the cooling coefficient of the clutch and the ambient temperature when the power is on again.
In some embodiments, when the interval time is less than the flame-out time, the calculation module is to:
obtaining clutch temperature T at power-offc_KeyOffAnd ambient temperature Tamb_KeyOff；
Determining the cooling coefficient b of the clutch according to the type of the vehicle and the type of the clutch materialc；
Obtaining an ambient temperature T at power-upamb_KeyOn；
According to the formula: t isc_KeyOn＝(Tc_KeyOff-Tamb_KeyOff)×exp(-time/bc)+Tamb_KeyOnCalculating the initial temperature T of the clutchc_KeyOn。
It is understood that the above-mentioned decision logic consists in: if the interval time is not less than the flameout time, which means that the clutch cooling time is very long, the initial temperature after the clutch is powered up again can be considered to be equal to the ambient temperature when the clutch is powered up again.
If the interval time is less than the flameout time, the cooling time of the clutch is not enough, and at the moment, the initial temperature of the clutch needs to be determined by comprehensively considering the difference between the clutch temperature and the ambient temperature when the power is off, the cooling coefficient of the clutch and the ambient temperature when the power is on again.
In some embodiments, the cooling coefficient bc∈[110，130]Preferably, bc＝120。
That is to say, in the embodiment, in order to determine the initial temperature of the clutch when the vehicle is started more accurately and efficiently, the flameout time is taken as a reference, and the situation is analyzed according to whether the interval time from the vehicle powering-off to the powering-on again exceeds the flameout time, so that on one hand, the situation is more suitable for the actual situation, and on the other hand, the calculation is simplified to a certain extent because the accurate calculation is required only when the interval time is not less than the flameout time.
In summary, the clutch initial temperature estimation device during vehicle starting in the invention estimates the clutch initial temperature again after short-time power-off by adopting the difference between the clutch temperature stored during last power-off and the environment temperature during power-on again, can effectively solve the error caused by calculating the clutch initial temperature during next starting by the difference between the clutch temperature stored during last power-off and the environment temperature, and improves the accuracy of clutch initial temperature estimation. The initial temperature is estimated by utilizing the flameout time, and when the interval time is longer, the initial temperature of the clutch after being electrified again is directly equal to the ambient temperature, so that the calculation amount of the TCU can be reduced, and the utilization rate of the running memory is improved.
Furthermore, an embodiment of the present invention also provides a computer-readable storage medium for storing a computer program or instructions which, when run on a computer, cause the computer to execute the above-described vehicle start-time clutch initial temperature estimation method.
Namely, executing: determining the interval time from the power-off of the vehicle to the power-on again and the flameout time;
when the interval time is not less than the flameout time, taking the ambient temperature when the power is re-electrified as the initial temperature of the clutch;
and when the interval time is less than the flameout time, determining the initial temperature of the clutch according to the difference between the clutch temperature and the ambient temperature when the power is off, the cooling coefficient of the clutch and the ambient temperature when the power is on again.
And performing: when the interval time is less than the flame-out time,
obtaining clutch temperature T at power-offc_KeyOffAnd ambient temperature Tamb_KeyOff；
Determining the cooling coefficient b of the clutch according to the type of the vehicle and the type of the clutch materialc；
Obtaining an ambient temperature T at power-upamb_KeyOn；
According to the formula: t isc_KeyOn＝(Tc_KeyOff-Tamb_KeyOff)×exp(-time/bc)+Tamb_KeyOnCalculating the initial temperature T of the clutchc_KeyOn。
In some embodiments, the cooling coefficient bc∈[110，130]。
Further, the time interval from when the vehicle is powered down to when it is powered up again is determined by a clock or timer.
Further, the flameout time is 7000-9000 s. Preferably, the flame-out time is 8000 s.
In particular, according to embodiments of the application, the processes described above with reference to the flow diagrams may be implemented as computer software programs. For example, embodiments of the present application include a computer program product comprising a computer program embodied on a computer readable medium, the computer program comprising program code for performing the method illustrated by the flow chart. In such an embodiment, the computer program may be downloaded and installed from a network via the communication section, and/or installed from a removable medium. The computer program, when executed by a Central Processing Unit (CPU), performs various functions defined in the apparatus of the present application.
It should be noted that the computer readable medium shown in the embodiments of the present application may be a computer readable signal medium or a computer readable storage medium or any combination of the two. A computer 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 of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a Read-Only Memory (ROM), an Erasable Programmable Read-Only Memory (EPROM), a 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. In the present application, a computer 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. In this application, however, a computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer 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 computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wired, etc., or any suitable combination of the foregoing.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. Each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams or flowchart illustration, and combinations of blocks in the block diagrams or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units described in the embodiments of the present application may be implemented by software, or may be implemented by hardware, and the described units may also be disposed in a processor. Wherein the names of the elements do not in some way constitute a limitation on the elements themselves.
As another aspect, the present application also provides a computer program product or computer program comprising computer instructions stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the video data processing method described in the above embodiments.
As another aspect, the present application also provides a computer-readable medium, which may be contained in the electronic device described in the above embodiments; or may exist separately without being assembled into the electronic device. The computer-readable medium carries one or more programs which, when executed by the electronic device, cause the electronic device to implement the video data processing method described in the above embodiments.
It should be noted that although in the above detailed description several modules or units of the device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit, according to embodiments of the application. Conversely, the features and functions of one module or unit described above may be further divided into embodiments by a plurality of modules or units.
Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein may be implemented by software, or by software in combination with necessary hardware. Therefore, the technical solution according to the embodiments of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a usb disk, a removable hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which can be a personal computer, a server, a touch terminal, or a network device, etc.) to execute the method according to the embodiments of the present application.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (10)
1. A method for estimating an initial clutch temperature at vehicle start-up, comprising the steps of:
determining the interval time from the power-off of the vehicle to the power-on again and the flameout time;
when the interval time is not less than the flameout time, taking the ambient temperature when the power is re-electrified as the initial temperature of the clutch;
and when the interval time is less than the flameout time, determining the initial temperature of the clutch according to the difference between the clutch temperature and the ambient temperature when the power is off, the cooling coefficient of the clutch and the ambient temperature when the power is on again.
2. The method of estimating clutch initial temperature at vehicle start-up according to claim 1, wherein determining the clutch initial temperature based on the clutch temperature and ambient temperature difference at power-down, the cooling coefficient of the clutch, and the ambient temperature at power-up again when the interval time is less than the key-off time comprises:
obtaining clutch temperature T at power-offc_KeyOffAnd ambient temperature Tamb_KeyOff；
Determining the cooling coefficient b of the clutch according to the type of the vehicle and the type of the clutch materialc；
Obtaining an ambient temperature T at power-upamb_KeyOn；
According to the formula: t isc_KeyOn＝(Tc_KeyOff-Tamb_KeyOff)×exp(-time/bc)+Tamb_KeyOnCalculating the initial temperature T of the clutchc_KeyOn。
3. The method of estimating initial clutch temperature at vehicle start-up according to claim 2, characterized in that said cooling coefficient bc∈[110，130]。
4. The method of estimating initial clutch temperature at vehicle start-up according to claim 1, characterized in that: the time interval from the vehicle powering down to the vehicle powering up again is determined by a clock or timer.
5. The method of estimating initial clutch temperature at vehicle start-up according to claim 1, characterized in that: the flameout time is 7000-9000 s.
6. A computer-readable storage medium storing a computer program or instructions for causing a computer to perform the method of any one of claims 1 to 5 when the computer program or instructions is run on the computer.
7. An initial clutch temperature estimating apparatus at the time of starting a vehicle, comprising:
the timing module is used for determining the interval time from the power-off of the vehicle to the power-on again and the flameout time;
a computing module to: when the interval time is not less than the flameout time, taking the ambient temperature when the power is re-electrified as the initial temperature of the clutch; and when the interval time is less than the flameout time, determining the initial temperature of the clutch according to the difference between the clutch temperature and the ambient temperature when the power is off, the cooling coefficient of the clutch and the ambient temperature when the power is on again.
8. The vehicle start-time clutch initial temperature estimation apparatus of claim 7, wherein when the interval time is less than the flameout time, the calculation module is configured to:
obtaining clutch temperature T at power-offc_KeyOffAnd ambient temperature Tamb_KeyOff；
Determining the cooling coefficient b of the clutch according to the type of the vehicle and the type of the clutch materialc；
Obtaining an ambient temperature T at power-upamb_KeyOn；
According to the formula: t isc_KeyOn＝(Tc_KeyOff-Tamb_KeyOff)×exp(-time/bc)+Tamb_KeyOnCalculating the initial temperature T of the clutchc_KeyOn。
9. The vehicle startup clutch initial temperature estimation apparatus of claim 8, wherein the cooling coefficient bc∈[110，130]。
10. The vehicle startup clutch initial temperature estimation device according to claim 7, characterized in that: the time interval from the power-off of the vehicle to the power-on of the vehicle is determined by the computing module through a clock or a timer.
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| CN102777589A (en) * | 2011-05-10 | 2012-11-14 | 通用汽车环球科技运作有限责任公司 | Method for determining initial temperatures in dry dual clutch transmissions |
| CN110953263A (en) * | 2019-12-04 | 2020-04-03 | 珠海华粤传动科技有限公司 | Control method and device based on surface temperature of wet-type double clutch |
| DE102019114962A1 (en) * | 2019-06-04 | 2020-12-10 | Schaeffler Technologies AG & Co. KG | Method for determining an initial value of a temperature model of a mechatronic system, mechatronic system and motor vehicle with a mechatronic system |
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- 2021-08-31 CN CN202111014546.9A patent/CN113761656A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102777589A (en) * | 2011-05-10 | 2012-11-14 | 通用汽车环球科技运作有限责任公司 | Method for determining initial temperatures in dry dual clutch transmissions |
| DE102019114962A1 (en) * | 2019-06-04 | 2020-12-10 | Schaeffler Technologies AG & Co. KG | Method for determining an initial value of a temperature model of a mechatronic system, mechatronic system and motor vehicle with a mechatronic system |
| CN110953263A (en) * | 2019-12-04 | 2020-04-03 | 珠海华粤传动科技有限公司 | Control method and device based on surface temperature of wet-type double clutch |
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