CN113864372A - Transmission predictive thermal protection method and automobile - Google Patents
Transmission predictive thermal protection method and automobile Download PDFInfo
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- CN113864372A CN113864372A CN202111282010.5A CN202111282010A CN113864372A CN 113864372 A CN113864372 A CN 113864372A CN 202111282010 A CN202111282010 A CN 202111282010A CN 113864372 A CN113864372 A CN 113864372A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
- F16D2066/001—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
- F16D2066/008—Arrangements for monitoring working conditions, e.g. wear, temperature of clutches
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Transmission Device (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
Abstract
The invention relates to the technical field of automobiles, in particular to a transmission predicative thermal protection method and an automobile, wherein the transmission predicative thermal protection method comprises the following steps of S1, collecting the temperature of a clutch plate at the current moment and the temperature of the clutch plate within the past set time; s2, fitting a relation curve of time and the temperature of the clutch plate according to the temperature of the clutch plate at the current moment and the temperature of the clutch plate in the past set time; s3, obtaining the predicted temperature of the clutch plate in the next set time period according to the relation curve; and S4, judging the size of the predicted temperature and the set temperature threshold, and sending a warning signal to a driver when the predicted temperature is greater than the temperature threshold. The temperature of the transmission can be accurately predicted, so that the transmission is effectively protected, and the driving experience is improved.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a transmission predicative thermal protection method and an automobile.
Background
Along with the development of the automobile industry, more and more automobiles enter the production and living field, and along with the popularization of the automobiles, the automobile production and production device brings great convenience to the life of people.
In automobiles, transmissions are important parts. The transmissions include an AT-type automatic transmission and a dual clutch transmission. In contrast to an AT-type automatic transmission, a dual clutch transmission does not have a hydrodynamic torque converter as a torque amplifying device. Therefore, under some severe conditions, especially when driving uphill or on a hill, the clutch of the dual clutch transmission needs to transmit large torque, and the clutch plate overtemperature and the transmission oil overtemperature are more easily generated than the AT transmission.
Currently, transmission thermal management focuses on two indicators, clutch plate temperature and transmission oil temperature. The clutch disc is made of metal materials, the specific heat capacity is low, the clutch disc is heated and heated quickly, the clutch disc is ablated and loses efficacy due to overhigh temperature of the clutch disc, and the valve body performance is reduced or even the function fails due to overhigh oil temperature of the transmission. The general thermal management mode is that thresholds are set for the clutch plate temperature and the transmission oil temperature respectively and are monitored, and when the monitored temperature exceeds the threshold, transmission overheating prevention protection measures such as lighting of an instrument fault lamp and reduction of transmission power input are adopted, so that the transmission is indirectly or directly protected from overheating.
To ensure that the clutch plate temperature is below its failure temperature, the overheat prevention threshold of the clutch plate is often set to be much lower than its failure temperature to avoid sudden temperature rise of the clutch plate and breakthrough of the failure temperature. Therefore, the clutch overheat protection is easy to trigger, and bad vehicle using experience is brought to customers.
Therefore, a transmission predictive thermal protection method and vehicle are needed to address the above technical problems.
Disclosure of Invention
The invention aims to provide a transmission predictive thermal protection method which can accurately predict the temperature of a transmission, so that the driving experience is improved while the transmission is effectively protected.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method of transmission predictive thermal protection comprising the steps of:
s1, collecting the temperature of the clutch plate at the current moment and the temperature of the clutch plate in the past set time;
s2, fitting a relation curve of time and the temperature of the clutch plate according to the temperature of the clutch plate at the current moment and the temperature of the clutch plate in the past set time;
s3, obtaining the predicted temperature of the clutch plate in the next set time period according to the relation curve;
and S4, judging the size of the predicted temperature and the set temperature threshold, and sending a warning signal to a driver when the predicted temperature is greater than the temperature threshold.
Optionally, in step S2, the temperature of the clutch plate is collected for three time points at intervals within a past set time.
Optionally, in step S2, the relationship curve is fit to the corresponding relationship between the temperature of the clutch plate and the time by using newton' S interpolation,
f(t)＝f(t0)+f[t0,t1]×(t0-t1)+f[t0,t1,t2]×(t0-t1)×(t0-t2)+f[t0,t1,t2,t3]×(t0-t1)×(t0-t2)×(t0-t3) (ii) a Wherein, f [ t ]0,t1]，f[t0,t1,t2]，f[t0,t1,t2,t3]Is a difference quotient;
f[t0,t1]＝[f(t0)-f(t1)]/(t0-t1)；
f[t0,t1,t2]＝[f[t1,t2]-f[t0,t1]]/(t1-t2)；
f[t0,t1,t2,t3]＝[f[t1,t2,t3]-f[t0,t1,t2]]/(t2-t3)；
f(t0) Temperature of the clutch plate at the present moment, f (t)1) Is t in the past1Temperature of the clutch plate at time f (t)2) Is t in the past2A temperature of the clutch plate at a time; f (t)3) Is t in the past3A temperature of the clutch plate at a time.
Optionally, in step S1, it is further required to acquire an oil temperature of the transmission, and the relationship curve is corrected by using the oil temperature of the transmission.
Optionally, the relationship curve obtained by correcting the relationship curve by using the oil temperature of the transmission is as follows:
T(t)＝f(t)×exp[(Cltt0-Oilt0)/Oilt0×Ct]wherein f (t) is the temperature of the clutch plate at time t, Cltt0For the temperature of the clutch plates at the present moment, Oilt0For the oil temperature of the transmission at the present moment, CtIs a constant coefficient of temperature difference.
Optionally, a first temperature sensor is integrated on the transmission, and the first temperature sensor can acquire the oil temperature of the transmission in real time.
Optionally, a cooler is integrated on the transmission, and when the oil temperature of the transmission is higher than a set oil temperature value, the first temperature sensor can control the cooler to be turned on.
Optionally, a second temperature sensor is integrated on the clutch plate, and the second temperature sensor can acquire the temperature of the clutch plate in real time.
Optionally, in step S4, the warning signal includes, but is not limited to, a light reminding signal and/or a voice signal.
The invention also aims to provide an automobile, which adopts the following technical scheme:
an automobile is protected against a transmission using the transmission predictive thermal protection method as described above.
The invention has the beneficial effects that:
the invention provides a predictive thermal protection method for a transmission, which is characterized by collecting the temperature of a clutch plate at the current time and the temperature of the clutch plate within the past set time, fitting a relation curve between the time and the temperature of the clutch plate by using the temperature of the clutch plate at the current time and the temperature of the clutch plate within the past set time, calculating the predicted temperature of the clutch plate within the next set time by using the relation curve, and sending a warning signal to a driver when the predicted temperature is greater than a temperature threshold value. Since the temperature of the clutch plate in the next time period is predicted according to the temperature of the clutch plate in the past time period and the temperature of the clutch plate at the current time, whether the temperature of the clutch plate needs to be thermally managed or not can be accurately judged. When setting for the temperature threshold, can set for some highly to when effectively protecting the derailleur, clutch overheat protection is triggered by less easily, promotes to ride and experiences.
According to the automobile provided by the invention, the transmission is protected by using the transmission predictive thermal protection method, so that the transmission can be effectively protected, meanwhile, the clutch overheating protection is not easy to trigger, and the driving experience is improved.
Drawings
FIG. 1 is a flow chart of a transmission predictive thermal protection method of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings and the embodiment. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In automobiles, transmissions are important parts. The transmissions include an AT-type automatic transmission and a dual clutch transmission. In contrast to an AT-type automatic transmission, a dual clutch transmission does not have a hydrodynamic torque converter as a torque amplifying device.
Clutches in dual clutch transmissions are required to transmit significant torque during certain demanding conditions, particularly uphill driving or hill holding. Transmitting a greater torque means that the clutch generates more heat, and excessive heat generation may cause the clutch plates to ablate so that the clutch fails, so the temperature of the clutch plates cannot be higher than the failure critical temperature value under strict control in the transmission thermal management strategy. The existing clutch plate overheating prevention strategy is realized by monitoring the temperature of the clutch plate, and once the temperature of the clutch plate is higher than a set temperature threshold value, overheating prevention measures are taken for a transmission. Because the clutch plate has a fast temperature rise rate, a large temperature interval generally exists between a generally set temperature threshold and a critical failure temperature of the clutch plate in order to provide effective protection for the clutch plate. Therefore, the clutch overheat protection is easy to trigger, and bad vehicle using experience is brought to customers.
In order to solve the above problems and improve the riding experience while effectively protecting the transmission, as shown in fig. 1, the invention provides a transmission predictive thermal protection method. The predictive thermal protection method for the transmission comprises the following steps:
s1, collecting the temperature of the clutch plate at the current moment and the temperature of the clutch plate in the past set time;
s2, fitting a relation curve of time and the temperature of the clutch plate according to the temperature of the clutch plate at the current time and the temperature of the clutch plate in the past set time;
s3, obtaining the predicted temperature of the clutch plate in the next set time period according to the relation curve;
and S4, judging the size of the predicted temperature and the set temperature threshold, and sending a warning signal to the driver when the predicted temperature is greater than the temperature threshold.
Since the temperature of the clutch plate in the next time period is predicted according to the temperature of the clutch plate in the past time period and the temperature of the clutch plate at the current time, whether the temperature of the clutch plate needs to be thermally managed or not can be accurately judged. When setting for the temperature threshold, can set for some highly to when effectively protecting the derailleur, clutch overheat protection is triggered by less easily, promotes to ride and experiences.
Alternatively, in step S2, the temperatures of the clutch plates are collected for three times at intervals within a past set time. In engineering, the temperature change of the clutch plate in the past set time can be accurately reflected at three moments, and sampling is facilitated. When the calculation is carried out, the calculation complexity can be reduced, so that the temperature change of the clutch plate can be rapidly analyzed, the clutch plate is thermally managed when needed, and the clutch plate is prevented from being burnt out or excessively worn. In other embodiments, the number of sampling time instants may be set according to actual needs, and is not limited herein. For convenience of sampling, in this embodiment, the intervals between the three time instants are equal intervals, and in other embodiments, the sampling may not be equal intervals, which is not limited herein.
Alternatively, in step S2, the relationship curve is fit to the corresponding relationship between the temperature and the time of the clutch plate by calculation using newton' S interpolation method,
f(t)＝f(t0)+f[t0,t1]×(t0-t1)+f[t0,t1,t2]×(t0-t1)×(t0-t2)+f[t0,t1,t2,t3]×(t0-t1)×(t0-t2)×(t0-t3) (ii) a Wherein, f [ t ]0,t1]，f[t0,t1,t2]，f[t0,t1,t2,t3]Is a difference quotient;
f[t0,t1]＝[f(t0)-f(t1)]/(t0-t1)；
f[t0,t1,t2]＝[f[t1,t2]-f[t0,t1]]/(t1-t2)；
f[t0,t1,t2,t3]＝[f[t1,t2,t3]-f[t0,t1,t2]]/(t2-t3)；
f(t0) Temperature of clutch plate at present time, f (t)1) Is t in the past1Temperature of clutch plate at time f (t)2) Is t in the past2The temperature of the clutch plate at the time; f (t)3) Is t in the past3The temperature of the clutch plates at the moment. The corresponding relation between the temperature and the time of the clutch plate can be accurately calculated and fitted by adopting a Newton interpolation method, and the variation trend of the relation curve can be pre-estimated, so that the temperature of the clutch plate can be judged in advanceAnd therefore, a data basis is provided for thermal management of the transmission, and driving experience is improved while effective play of the thermal management of the transmission is guaranteed.
Since the oil of the transmission can effectively cool the clutch plates, the temperature of the clutch plates has a great correlation with the temperature difference between the clutch plates and the temperature of the transmission oil, and the influence of the oil temperature of the transmission must be considered when estimating the temperature of the clutch plates. Further, in step S1, it is necessary to acquire the oil temperature of the transmission, and correct the relationship curve by using the oil temperature of the transmission. The temperature of the clutch plate can be predicted more accurately by correcting the relation curve.
Specifically, the relationship curve obtained by correcting the relationship curve by using the oil temperature of the transmission is as follows:
T(t)＝f(t)×exp[(Cltt0-Oilt0)/Oilt0×Ct]wherein f (t) is the temperature of the clutch plate at time t, Cltt0For the temperature of the clutch plates at the present moment, Oilt0The oil temperature of the transmission at the present moment, CtIs a constant coefficient of temperature difference. By adopting the formula for calculation, the relationship curve of the corrected time and the temperature of the clutch plate can be ensured to reflect the temperature change of the clutch plate in the transmission more truly.
Optionally, a first temperature sensor is integrated on the transmission, and the first temperature sensor can acquire the oil temperature of the transmission in real time. The oil temperature of the transmission can be collected in real time by arranging the first temperature sensor, so that real-time and accurate data are provided for calculating the predicted temperature of the clutch plate.
Furthermore, a cooler is integrated on the transmission, and when the oil temperature of the transmission is higher than a set oil temperature value, the first temperature sensor can control the cooler to be started. The oil temperature value of the transmission is detected in real time through the first temperature sensor, and the cooler is started when needed, so that heat in the transmission oil is rapidly discharged to the outside, the transmission oil is effectively cooled to the clutch disc, and the clutch disc can still effectively work under certain harsh working conditions, particularly during uphill driving or slope stopping working conditions.
Optionally, a second temperature sensor is integrated on the clutch plate, and the second temperature sensor can acquire the temperature of the clutch plate in real time. The temperature of the clutch plate can be collected in real time by arranging the second temperature sensor, so that real-time and accurate data are provided for calculating the predicted temperature of the clutch plate.
Optionally, in step S4, the warning signal includes, but is not limited to, a light reminding signal and/or a voice signal. In this embodiment, when the predicted temperature of the clutch disc is greater than the temperature threshold, firstly, the fault lamp arranged on the dashboard of the vehicle flashes to remind the driver, when the driver does not take measures within a certain time, the voice reminding is performed, and after the voice reminding is set for time, if the driver does not take action, the transmission performs torque limiting operation, so that the clutch disc is protected, and the clutch disc is prevented from being burnt.
The embodiment also provides an automobile, and the transmission is protected by using the transmission predictive thermal protection method, so that the temperature of the transmission can be accurately predicted, and the driving experience is improved while the transmission is effectively protected.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A method of predictive thermal protection of a transmission, comprising the steps of:
s1, collecting the temperature of the clutch plate at the current moment and the temperature of the clutch plate in the past set time;
s2, fitting a relation curve of time and the temperature of the clutch plate according to the temperature of the clutch plate at the current moment and the temperature of the clutch plate in the past set time;
s3, obtaining the predicted temperature of the clutch plate in the next set time period according to the relation curve;
and S4, judging the size of the predicted temperature and the set temperature threshold, and sending a warning signal to a driver when the predicted temperature is greater than the temperature threshold.
2. A method of predictive thermal protection for a transmission according to claim 1, wherein in step S2, the temperature of the clutch plates is collected at three points in time at intervals set in the past.
3. A predictive thermal protection method for a transmission according to claim 2, wherein in step S2, the relationship curve is calculated and fitted to the corresponding relationship between the temperature of the clutch plates and the time by Newton' S interpolation,
f(t)＝f(t0)+f[t0,t1]×(t0-t1)+f[t0,t1,t2]×(t0-t1)×(t0-t2)+f[t0,t1,t2,t3]×(t0-t1)×(t0-t2)×(t0-t3) (ii) a Wherein, f [ t ]0,t1]，f[t0,t1,t2]，f[t0,t1,t2,t3]Is a difference quotient;
f[t0,t1]＝[f(t0)-f(t1)]/(t0-t1)；
f[t0,t1,t2]＝[f[t1,t2]-f[t0,t1]]/(t1-t2)；
f[t0,t1,t2,t3]＝[f[t1,t2,t3]-f[t0,t1,t2]]/(t2-t3)；
f(t0) Temperature of the clutch plate at the present moment, f (t)1) Is t in the past1Temperature of the clutch plate at time f (t)2) Is t in the past2A temperature of the clutch plate at a time; f (t)3) Is t in the past3A temperature of the clutch plate at a time.
4. The predictive thermal protection method for a transmission according to claim 1, wherein in step S1, an oil temperature of the transmission is further acquired, and the relationship curve is corrected by using the oil temperature of the transmission.
5. A predictive thermal protection method for a transmission according to claim 4, wherein said relationship curve modified by said transmission oil temperature is:
T(t)＝f(t)×exp[(Cltt0-Oilt0)/Oilt0×Ct]wherein f (t) is the temperature of the clutch plate at time t, Cltt0For the temperature of the clutch plates at the present moment, Oilt0For the oil temperature of the transmission at the present moment, CtIs a constant coefficient of temperature difference.
6. The predictive thermal protection method for a transmission of claim 4, wherein a first temperature sensor is integrated with the transmission, and the first temperature sensor is capable of acquiring the oil temperature of the transmission in real time.
7. The predictive thermal protection method for a transmission of claim 6, wherein a desuperheater is integrated with the transmission, and the first temperature sensor is capable of controlling the desuperheater to be turned on when the temperature of the oil in the transmission is higher than a set oil temperature value.
8. The predictive thermal protection method for a transmission of claim 1, wherein a second temperature sensor is integrated with the clutch plate, wherein the second temperature sensor is capable of acquiring the temperature of the clutch plate in real time.
9. A method of transmission predictive thermal protection according to claim 1, wherein in step S4, said warning signal includes but is not limited to a light warning signal and/or a voice signal.
10. A motor vehicle, characterized in that the transmission is safeguarded using the transmission predictive thermal protection method according to any of claims 1 to 9.
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| CN202111282010.5A CN113864372A (en) | 2021-11-01 | 2021-11-01 | Transmission predictive thermal protection method and automobile |
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Cited By (1)
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