Wet dual clutch temperature acquisition method and device

Abstract

The present invention discloses a wet dual clutch temperature acquisition method and device, which is used to improve the accuracy of the clutch-related temperature acquisition. The method part includes: acquiring vehicle operating parameters, the vehicle operating parameters including the vehicle initial operating state position; judging whether the initial operating state position meets the preset conditions; if the initial operating state position meets the preset conditions, acquiring the segment temperature of the target segment in the first clutch at the previous moment; acquiring the sliding power of the target segment, and acquiring the cooling power of the target segment at the current moment; acquiring the heat conduction power of the second clutch to the first clutch at the current moment; determining the temperature of the target segment at the current moment according to the segment temperature, sliding power, cooling power and heat conduction power at the previous moment.

Description

Technical Field

[0001] The present invention relates to the field of vehicle control technology, and in particular to a method and device for obtaining the temperature of a wet dual clutch. Background Art

[0002] Dual-clutch automatic transmission has the characteristics of fast shifting and no power interruption, which can provide good driving performance for the vehicle. Dual-clutch transmission can be divided into dry dual-clutch and wet dual-clutch according to the clutch type.

[0003] In order to prevent the clutch from burning and damaging due to excessive clutch temperature, the clutch-related temperature of the vehicle needs to be monitored. In the prior art, a method for obtaining the clutch temperature is proposed, which first calculates the actual lubrication flow into the clutch assembly, and calculates the surface temperatures of the two clutches based on the actual lubrication flow into the clutch assembly, the engine speed, the transmission oil temperature, and the sliding power of the two clutches. Then, the surface temperatures of the two clutches and the transmission oil temperature are used to determine whether the clutch is overheated, so as to perform the next control. It can be seen that the prior art does not consider the influence between the two clutches, resulting in a low accuracy of the clutch-related temperature finally obtained. Summary of the invention

[0004] The present invention provides a method and device for obtaining the temperature of a wet dual clutch, so as to solve the problem in the prior art that the accuracy of the finally obtained clutch-related temperature is low.

[0005] A first aspect provides a method for obtaining temperature of a wet dual clutch, comprising:

[0006] Acquiring vehicle operating parameters, wherein the vehicle operating parameters include an initial operating state of the vehicle;

[0007] Determining whether the initial operation status bit meets a preset condition;

[0008] If the initial operating state meets the preset condition, obtaining the segment temperature of the target segment in the first clutch at the last moment;

[0009] Acquire the sliding power of the target segment, and acquire the cooling power of the target segment at the current moment;

[0010] Obtaining heat transfer power from the second clutch to the first clutch at the current moment;

[0011] The temperature of the target segment at the current moment is determined according to the segment temperature, the sliding power, the cooling power and the heat conduction power at the previous moment.

[0012] Furthermore, the target fragment is determined by:

[0013] Divide each sleeve steel sheet of the first clutch into n equal steel sheet segments, and use the equal steel sheet segments as the target segments;

[0014] or,

[0015] Each friction plate of the first clutch is divided into n equal friction plate segments, and the equal friction plate segments are used as the target segments.

[0016] Furthermore, the method further comprises:

[0017] If the initial operation state does not meet the preset condition, obtaining the current ambient temperature, the storage segment temperature of the target segment stored when the vehicle was last turned off, and the last stop operation time of the vehicle;

[0018] The temperature of the target segment at the current moment is determined according to the current ambient temperature, the temperature of the storage segment and the stop operation time.

[0019] Further, the determining the temperature of the target segment at the current moment according to the current ambient temperature, the temperature of the storage segment and the stop operation time includes:

[0020] The temperature of the target segment at the current moment is calculated by the following formula:

[0021] T1(k)=T 1Saved -f(T Ambient ,t keyoff );

[0022] Wherein, T1(k) represents the temperature of the target segment at the current moment, T 1Saved represents the storage segment temperature, T Ambient Indicates the current ambient temperature, t keyoff represents the stopping time, f(T Ambient ,t keyoff ) is the attenuation function of the current ambient temperature and the duration of shutdown.

[0023] Further, the obtaining of the heat transfer power of the second clutch to the first clutch at the current moment includes:

[0024] obtaining an effective heat conduction contact area between the second clutch and the first clutch;

[0025] Obtaining the thermal conductivity of the steel sheet of the first clutch;

[0026] The heat conduction power is obtained according to the thermal conductivity of the steel sheet and the effective heat conduction contact area.

[0027] Further, the obtaining of the heat conduction power at the current moment according to the segment temperature of the target segment at the previous moment, the effective heat conduction contact area, the thermal conductivity of the steel sheet and the segment temperature of the reference segment at the previous moment comprises:

[0028] The heat transfer power of the second clutch to the first clutch at the current moment is obtained by the following formula:

[0029] P cond_2to1 (k) = λ Plate ·A 2to1 ·(T 2Plate (k-1)-T 1Plate (k-1));

[0030] Among them, P cond_2to1 (k) represents the heat conduction power, λ Plate Indicates the thermal conductivity of the steel sheet, A 2to1 represents the effective heat conduction contact area of ​​the second clutch to the first clutch, T 2Plate (k-1) represents the segment temperature of the steel plate segment on the second clutch at the last moment, T 1Plate (k-1) represents the segment temperature of the steel plate segment on the first clutch at the previous moment.

[0031] Further, the determining the temperature of the target segment at the current moment according to the segment temperature, sliding power, cooling power and heat conduction power at the previous moment includes:

[0032] The temperature of the target steel sheet segment at the current moment is calculated by:

[0033]

[0034] Wherein, T1(k) represents the temperature of the target segment at the current moment, T1(k-1) represents the segment temperature of the target segment at the previous moment, and P cond_2to1 (k) represents the heat conduction power, P 1conv (k) represents the cooling power, m represents the mass of the target segment, C represents the specific heat capacity corresponding to the target segment, and Δt represents the unit time.

[0035] Further, the obtaining the cooling power of the target segment at the current moment includes:

[0036] Acquiring the inlet oil temperature of the target segment at the previous moment;

[0037] Obtaining the Reynolds number, Prandtl number, thermal conductivity of lubricating oil and characteristic length corresponding to the target segment;

[0038] Determining the convective heat transfer coefficient of the target segment relative to the lubricating oil according to the Reynolds number, the Prandtl number, the thermal conductivity of the lubricating oil and the characteristic length;

[0039] The cooling power of the target segment at the current moment is determined according to the segment temperature, the inlet oil temperature and the convection heat transfer coefficient at the previous moment.

[0040] A second aspect provides a wet dual clutch temperature acquisition device, comprising:

[0041] A first acquisition module, used for acquiring vehicle operation parameters, wherein the vehicle operation parameters include an initial operation state of the vehicle;

[0042] A judging module, used to judge whether the initial operation status position meets a preset condition;

[0043] A second acquisition module, configured to acquire the segment temperature of the target segment in the first clutch at a previous moment if the initial operating state meets a preset condition;

[0044] A third acquisition module is used to acquire the sliding power of the target segment and acquire the cooling power of the target segment at a current moment;

[0045] A fourth acquisition module, used for acquiring the heat conduction power of the second clutch to the first clutch at the current moment;

[0046] The determination module is used to determine the temperature of the target segment at the current moment according to the segment temperature, sliding power, cooling power and heat conduction power at the previous moment.

[0047] The third aspect provides a wet dual clutch temperature acquisition device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above-mentioned wet dual clutch temperature acquisition method when executing the computer program.

[0048] In one solution provided by the above-mentioned wet dual-clutch temperature acquisition method and device, when the initial operating state of the vehicle meets the preset conditions, the sliding power and cooling power of the target segment on the clutch are obtained, and finally the temperature of the target segment of the clutch is calculated by comprehensively considering the sliding power, cooling power and heat conduction between the two clutches. When calculating the temperature of the clutch-related segments, not only factors such as the sliding power are considered, but also the influence of heat conduction between the inner and outer clutches when the clutches slip, so that the temperatures of the inner and outer clutch-related segments can be accurately calculated, thereby improving the accuracy of obtaining the clutch-related temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0050] Figure 1 is a schematic flow chart of a method for obtaining temperature of a wet dual clutch in one embodiment of the present invention;

[0051] Figure 2 It is a structure and an equally divided schematic diagram of a research object in one embodiment of the present invention;

[0052] Figure 3 is a structural schematic diagram of a wet dual clutch temperature acquisition device in one embodiment of the present invention;

[0053] Figure 4 1 is another schematic diagram of the structure of a wet dual clutch temperature acquisition device in one embodiment of the present invention. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] The wet dual clutch temperature acquisition method proposed in the present invention is applicable to various wet dual clutches, and the wet dual clutch includes a first clutch and a second clutch, wherein the first clutch refers to an odd clutch and the second clutch refers to an even clutch; or, the first clutch refers to an even clutch and the second clutch refers to an odd clutch. For the convenience of explanation and description of the scheme, especially in the formulas and related expressions below, the odd clutch is represented by C1 and the even clutch is represented by C2. It is also worth noting that the wet dual clutch includes peripheral components such as a sleeve steel plate, a sleeve friction plate and a gearbox. The specific structure of the wet dual clutch is not described in detail here.

[0056] In the present invention, the initial operating state of the vehicle is first obtained to determine whether the initial operating state meets the preset conditions; if the initial operating state meets the preset conditions, the segment temperature of the target segment in the first clutch at the previous moment is obtained; the sliding power of the target segment is obtained, and the cooling power of the target segment at the current moment is obtained; the heat conduction power of the second clutch to the first clutch at the current moment is obtained; the temperature of the target segment at the current moment is determined based on the segment temperature, sliding power, cooling power and heat conduction power at the previous moment. Among them, the above-mentioned target segment can refer to a complete sleeve steel plate, or a complete sleeve friction plate; of course, the target segment can also refer to a steel plate segment divided from a complete sleeve steel plate, or a friction plate segment divided from a complete sleeve friction plate, and the present invention does not make specific limitations.

[0057] The present invention can calculate the temperature of the steel plate segment and / or friction plate segment of the odd-numbered clutch, and can also calculate the temperature of the steel plate segment and / or friction plate segment of the even-numbered clutch. When calculating the temperature of the clutch-related segment, not only factors such as sliding power are considered, but also the influence of heat conduction between the inner and outer clutches during sliding between the clutches is considered. The temperature of the steel plate segment and / or friction plate segment of the inner and outer clutches can be accurately calculated, thereby improving the accuracy of the clutch-related temperature. The present invention is described in detail below.

[0058] In one embodiment, if Figure 1 As shown, a method for obtaining the temperature of a wet dual clutch is provided, comprising the following steps:

[0059] S100: Acquire vehicle operating parameters, where the vehicle operating parameters include an initial operating state of the vehicle.

[0060] In the embodiment of the present invention, when it is necessary to obtain the relevant temperature of the clutch, it is necessary to first obtain the vehicle operating parameters, wherein the vehicle operating parameters include the vehicle initial operating state bit B_FirstKeyon. The vehicle initial operating state bit B_FirstKeyon can be read through the vehicle bus and is not described in detail here.

[0061] S200: Determine whether the initial operation status meets a preset condition.

[0062] S300: If the initial operating state meets the preset condition, the segment temperature of the target segment in the first clutch at the last moment is obtained.

[0063] After obtaining the vehicle initial operation state bit B_FirstKeyon, different ways of obtaining clutch-related temperature are adopted according to different situations of the vehicle initial operation state bit B_FirstKeyon to obtain a temperature with higher accuracy. Specifically, in one embodiment, if it is determined that the initial operation state bit is in a non-set state, that is, B_FirstKeyon=0, it is determined that the initial operation state bit meets the preset condition; if it is determined that the initial operation state bit is in a set state, that is, B_FirstKeyon=1, it is determined that the initial operation state bit does not meet the preset condition.

[0064] When the initial operation state meets the preset conditions, the segment temperature of the target segment in the first clutch at the last moment is obtained. It should be noted that, as mentioned above, the target segment can refer to the steel plate segment on the first clutch, or the friction plate segment on the first clutch, that is, the target segment can refer to the steel plate segment and / or friction plate segment on the odd-numbered clutch, or the steel plate segment and / or friction plate segment on the even-numbered clutch, and the present invention does not limit this.

[0065] S400: Acquire the sliding power of the target segment, and acquire the cooling power of the target segment at the current moment.

[0066] When the initial operation state bit B_FirstKeyon meets the preset conditions, the sliding power of the target segment is further obtained, and the cooling power of the target segment at the current moment is obtained. For example, if the target segment is a steel segment, the sliding power of the steel segment on the first clutch can be obtained, and the cooling power of the steel segment of the first clutch at the current moment can be obtained; if the target segment is a friction segment, the sliding power of the friction segment on the first clutch can be obtained, and the cooling power of the friction segment on the first clutch at the current moment can be obtained.

[0067] S500: Obtaining the heat transfer power of the second clutch to the first clutch at the current moment.

[0068] It should be noted that during the shifting process using a wet dual clutch, the heat conduction between the two clutches affects the temperature of the clutch. In order to improve the accuracy of the obtained steel plate fragments and / or friction plate fragments, in the present invention, when the initial operating state position B_FirstKeyon meets the preset conditions, it is necessary to further obtain the heat conduction power between the first clutch and the first clutch at the current moment.

[0069] Among them, the heat conduction power between the first clutch and the first clutch includes two aspects of heat conduction power, one is the heat conduction power of the first clutch to the second clutch, and the other is the heat conduction power of the second clutch to the first clutch. In the present invention, since what is calculated is the temperature of the target segment of the first clutch, what is obtained at this time is the heat conduction power of the second clutch to the first clutch at the current moment.

[0070] For example, if the first clutch is an odd clutch and the second clutch is an even clutch, when calculating the temperature of the target segment on the odd clutch at the current moment, the heat transfer power of the even clutch to the odd clutch is obtained; on the contrary, if the first clutch is an even clutch and the second clutch is an odd clutch, when calculating the temperature of the target segment on the even clutch at the current moment, the heat transfer power of the odd clutch to the even clutch is obtained.

[0071] S600: Determine the temperature of the target segment at the current moment according to the segment temperature, sliding power, cooling power and heat conduction power at the previous moment.

[0072] After obtaining the segment temperature, sliding power, cooling power of the target segment of the first clutch at the previous moment, and the heat conduction power of the second clutch to the first clutch at the current moment, the temperature of the target segment at the current moment can be determined according to the segment temperature, sliding power, cooling power and heat conduction power at the previous moment. It can be seen that the present invention provides a method for obtaining the temperature of a wet dual clutch, which can calculate the temperature of the steel plate segment and / or friction plate segment of an odd-numbered clutch, and can also calculate the temperature of the steel plate segment and / or friction plate segment of an even-numbered clutch. When calculating the temperature of the clutch-related segments, not only factors such as sliding power are considered, but also the influence of heat conduction between the inner and outer clutches when the clutches slide, and the corresponding heat conduction power between the two clutches is calculated, so that the temperature of the steel plate and friction plate-related segments of the inner and outer clutches can be accurately calculated, which improves the accuracy of the clutch-related temperature and helps to provide accurate temperature data for other control functions of the vehicle.

[0073] It should be noted that, for the above process, the specific execution order of obtaining relevant parameters is not specifically limited, and the implementation of the present invention provides a more detailed implementation plan for each process, which is described in detail below.

[0074] Due to the temperature symmetry of the steel plate or friction plate on the clutch, it can be considered that the steel plate and the friction plate are insulated on both sides of the radial symmetry line. In one embodiment, combined with the above embodiment, the friction pair of the first clutch can be divided into n equal parts in the embodiment of the present invention, that is, the complete set of steel plates and the complete set of friction plates of the odd-numbered clutch and / or the even-numbered clutch can be divided into n segments with equal radial lengths along the radial direction, namely Segment1, Segment2, ..., Segment (n-1), Segmentn, and a pair of friction pairs are taken as the research object, which can be specifically as follows: Figure 2 As shown, at this time, the inner and outer diameters of the clutch are represented by r1 and r2, and T oil Indicates the temperature of the oil flowing into the clutch.

[0075] Taking the steel sheet segments divided into equal parts on an odd-numbered clutch as an example, the inner and outer diameters and areas of the nth steel sheet segment can be shown as follows:

[0076]

[0077]

[0078] A C1Seg(n) =π·(r C1outSeg(n) 2 -r C1inSeg(n) 2 );

[0079] Among them, r C1inSeg(n) Represents the inner diameter of the nth equal steel segment on the odd clutch, r C1outSeg(n) Indicates the outer diameter of the nth equal steel plate segment on the odd clutch, A C1Seg(n) Represents the area of ​​the nth equal steel segment on the odd clutch, r C1in Indicates the inner diameter of the complete set of steel plates on the odd-numbered clutch, r C1out Indicates the inner diameter of the complete set of steel plates on the odd-numbered clutch.

[0080] Taking the steel sheet segments divided into equal parts on an even-numbered clutch as an example, the inner and outer diameters and areas of the nth steel sheet segment can be shown as follows:

[0081]

[0082]

[0083] A C2Seg(n) =π·(r C2outSeg(n) 2 -r C2inSeg(n) 2 );

[0084] Among them, r C2inSeg(n)Represents the inner diameter of the nth equal steel plate segment on an even-numbered clutch, r C2outSeg(n) Indicates the outer diameter of the nth equal steel plate segment on an even-numbered clutch, A C2Seg(n) Represents the area of ​​the nth equal steel segment on an even clutch, r C2in Represents the inner diameter of the complete set of steel plates on the even-numbered clutch, r C2out Indicates the inner diameter of the complete set of steel plates on the even-numbered clutch.

[0085] It should be noted that, for the equal friction plate segments divided on the odd-numbered clutch or the even-numbered clutch, their inner and outer diameters and areas can refer to the calculation method of the equal steel plate segments mentioned above, which will not be described one by one here.

[0086] That is to say, the division method of this embodiment can divide each complete set of steel plates of the first clutch into n equal steel plate segments, and can divide each complete set of friction plates of the first clutch into n equal friction plate segments. In this embodiment, the target segments refer to the equal steel plate segments and / or equal friction plate segments divided on the odd-numbered clutch and / or the even-numbered clutch. It should be noted that the specific number of segments of n can be 5, 6, etc., which is not limited here. In this embodiment, the steel plates and friction plates on the odd-numbered clutch and / or the even-numbered clutch can be divided more finely, so as to obtain the segment temperature of each equal steel plate segment or friction plate segment, which can improve the calculation accuracy of the steel plate temperature on the odd-numbered clutch and the even-numbered clutch, so that the relevant temperature of the clutch obtained is more meaningful and valuable for reference.

[0087] In one embodiment, in S400, obtaining the sliding power of the target segment specifically includes the following steps:

[0088] S401a: Acquire the engine speed of the vehicle, the clutch speed corresponding to the first clutch, and the clutch transmission torque.

[0089] In the embodiment of the present invention, the acquired vehicle operating parameters may also include the vehicle engine speed n tin ; The clutch speed n corresponding to the first clutch clu , that is, the clutch speed n corresponding to the odd-numbered clutch clu1 , or the clutch speed n corresponding to the even-numbered clutch clu2 ; The clutch transmission torque T corresponding to the first clutch clu , that is, the clutch transmission torque T corresponding to the odd-numbered clutch clu1 , or the clutch torque T corresponding to the even-numbered clutch clu2 Among them, the engine speed, the clutch speed corresponding to the first clutch and the clutch transmission torque can all be directly read through the vehicle bus, or obtained by converting other parameters, which will not be described in detail here.

[0090] S402a: Determine a total slip power corresponding to the first clutch according to the engine speed, clutch speed and clutch transmission torque of the vehicle.

[0091] After obtaining the engine speed n tin , the clutch speed n corresponding to the first clutch clu and clutch transmission torque T clu After that, according to the engine speed n tin , the clutch speed n corresponding to the first clutch clu and clutch transmission torque T clu Determine the total slip power P corresponding to the first clutch SlideSeg(n) .

[0092] Assuming the first clutch is an odd-numbered clutch, the total slip power P corresponding to the odd-numbered clutch is C1SlideSeg(n) The specific calculation method can be shown as follows:

[0093] P C1SlideSeg(n) =(n tin -n clu1 )·T clu1 ;

[0094] Assuming the first clutch is an even-numbered clutch, the total slip power P corresponding to the even-numbered clutch is C2SlideSeg(n) The specific calculation method can be shown as follows:

[0095] P C2SlideSeg(n) =(n tin -n clu2 )·T clu2 .

[0096] S403a: Determine the ratio of the sliding power of the target segment to the total sliding power.

[0097] In this embodiment, the purpose is to obtain the sliding power of the target segment, that is, the steel plate segment or the friction plate segment. Therefore, it is also necessary to determine the proportion of the sliding power of the target segment to the total sliding power. It should be noted that the proportion ε of the steel plate segment and the friction plate segment on the clutch to the total sliding power is calculated as follows:

[0098]

[0099] Among them, λ plate Indicates the thermal conductivity of steel sheet, p plate Indicates the density of steel sheet, c plate represents the specific heat capacity of steel sheet, λ lining represents the thermal conductivity of the friction plate, p lining Indicates the friction plate density, clining Indicates the specific heat capacity of the friction plate.

[0100] S404a: Determine the sliding friction power of the target segment according to the total sliding friction power and the ratio.

[0101] After determining the total friction power of the first clutch and the ratio of the target segment, the friction power of the target segment can be determined according to the total friction power and the ratio. The calculation methods are as follows:

[0102] For an odd number of clutches, the sliding power P corresponding to the nth equal steel plate segment on a single complete set of steel plates C1SlidePlateSeg(n) for:

[0103]

[0104] For an odd number of clutches, the sliding power P corresponding to the nth equal friction plate segment on a single complete set of friction plates is C1SlideLiningSeg(n) for:

[0105]

[0106] For an even-numbered clutch, the sliding friction power P corresponding to the nth equal steel plate segment on a single complete set of steel plates C2SlidePlateSeg(n) for:

[0107]

[0108] For an even-numbered clutch, the sliding power P corresponding to the nth equal friction plate segment on a single complete set of friction plates is C2SlideLiningSeg(n) for:

[0109]

[0110] It should be noted that in the above formula, S C1 Indicates the number of complete sets of friction plates on odd-numbered clutches, S C2 Indicates the number of complete sets of friction plates on an even-numbered clutch.

[0111] It can be seen that in this embodiment, a method for specifically obtaining the sliding power of a target steel plate segment or a target friction plate segment is proposed, which improves the feasibility of the solution.

[0112] In one embodiment, in S400, obtaining the cooling power of the target segment at the current moment specifically includes the following steps:

[0113] S401b: Obtaining the inlet oil temperature of the target segment at the previous moment.

[0114] It should be noted that the previous moment is equivalent to the current moment, and in the embodiment of the present invention, the vehicle operation parameters obtained also include the inlet oil temperature of the target segment at the previous moment. In other words, the inlet oil temperature of the steel plate segment at the previous moment and / or the inlet oil temperature of the friction plate segment at the previous moment can be obtained.

[0115] For the convenience of describing the scheme, in the present invention, each relevant temperature is expressed in the following manner:

[0116] T C1PlateSeg(n) (k) represents the segment temperature of the nth equal steel segment on the odd clutch at the current moment;

[0117] T C1PlateSeg(n) (k-1) represents the segment temperature of the nth equal steel segment on the odd clutch at a certain moment;

[0118] T C2PlateSeg(n) (k) represents the segment temperature of the nth equal steel segment on the even-numbered clutch at the current moment;

[0119] T C2PlateSeg(n) (k-1) represents the segment temperature of the nth equal steel segment on the even clutch at a certain moment;

[0120] T C1LiningSeg(n) (k) represents the segment temperature of the nth friction plate segment on the odd-numbered clutch at the current moment;

[0121] T C1LiningSeg(n) (k-1) represents the segment temperature of the nth friction plate segment on the odd-numbered clutch at a previous moment;

[0122] T C2LiningSeg(n) (k) represents the segment temperature of the nth friction plate segment on the even-numbered clutch at the current moment;

[0123] T C2LiningSeg(n) (k-1) represents the segment temperature of the nth friction plate segment on the even-numbered clutch at a previous moment;

[0124] T C1Seg(n)oillin (k-1) represents the inlet oil temperature of the nth equal steel plate segment or friction plate segment on the odd-numbered clutch at a certain moment;

[0125] T C2Seg(n)oillin (k-1) represents the inlet oil temperature of the nth equal steel plate segment or friction plate segment on the even-numbered clutch at a certain moment.

[0126] S302b: Obtain the Reynolds number, Prandtl number, thermal conductivity of lubricating oil and characteristic length corresponding to the target segment.

[0127] In this embodiment, the Reynolds number, Prandtl number, thermal conductivity of lubricating oil and characteristic length corresponding to the target segment are further obtained. The specific acquisition process or method is introduced one by one below.

[0128] Reynolds number Re corresponding to the target segment on the odd clutch clu1 It can be calculated as follows:

[0129] Among them, u clu1 Indicates the oil flow rate on the odd-numbered clutch, l clu1 represents the characteristic length corresponding to the target fragment on the odd clutch, v oil Indicates the kinematic viscosity of lubricating oil.

[0130] Reynolds number corresponding to the target segment on the even clutch clu2 It can be calculated as follows:

[0131] Among them, u clu2 Indicates the oil flow rate on the even-numbered clutch, l clu2 represents the characteristic length corresponding to the target fragment on the even clutch, v oil Indicates the kinematic viscosity of lubricating oil.

[0132] It should be noted that the lubricating oil flow rate u on the odd or even clutch clu It can be obtained by converting the clutch speed and cooling lubrication flow of the corresponding clutch, which will not be described in detail here.

[0133] Prandtl number Rr corresponding to the target segment on the odd clutch clu1 It can be calculated as follows:

[0134]

[0135] Prandtl number Rr corresponding to the target segment on the even clutch clu2 It can be calculated as follows:

[0136]

[0137] Among them, v oil Indicates the kinematic viscosity of lubricating oil, p oil Indicates the density of lubricating oil, c oil represents the specific heat capacity of lubricating oil, λ oil It represents the thermal conductivity of lubricating oil. It should be noted that the above parameters can be obtained when obtaining vehicle operating parameters. The specific acquisition method and way are not limited here and will not be described in detail.

[0138] S403b: Determine the convective heat transfer coefficient of the target segment relative to the lubricating oil according to the Reynolds number, the Prandtl number, the thermal conductivity of the lubricating oil and the characteristic length.

[0139] After obtaining the corresponding Reynolds number, Prandtl number, thermal conductivity of lubricating oil and characteristic length of the target segment, the convective heat transfer coefficient of the target segment relative to the lubricating oil can be determined according to the corresponding Reynolds number, Prandtl number, thermal conductivity of lubricating oil and characteristic length of the target segment, which are described below.

[0140] For odd-numbered clutches, the convective heat transfer coefficient h of the target segment relative to the lubricating oil is clu1 for:

[0141]

[0142] For an even number of clutches, the convective heat transfer coefficient h of the target segment relative to the lubricating oil is clu2 for:

[0143]

[0144] S304b: Determine the cooling power of the target segment at the current moment according to the segment temperature, the inlet oil temperature and the convection heat transfer coefficient at the previous moment.

[0145] After obtaining the segment temperature of the target segment at the last moment, the inlet oil temperature at the last moment, and the convection heat transfer coefficient, the cooling power of the target segment at the current moment can be determined according to the segment temperature of the target segment at the last moment, the inlet oil temperature at the last moment, and the convection heat transfer coefficient. The following describes how to calculate the corresponding cooling power for the steel segment and the friction plate segment.

[0146] The cooling power P of the nth steel segment at the current moment on the odd-numbered clutch C1conv_Plate(n) (k) is:

[0147] P C1conv_Plate(n) (k) = h clu1 ·A clu1Plate(n) ·(T C1PlateSeg(n) (k-1)-T C1Seg(n)oillin (k-1));

[0148] On an even-numbered clutch, the cooling power P of the nth steel segment at the current moment C2conv_Plate(n) (k) is:

[0149] P C2conv_Plate(n) (k) = h clu2 ·A clu2Plate(n) ·(T C2PlateSeg(n) (k-1)-T C2Seg(n)oillin (k-1));

[0150] The cooling power P of the nth friction plate segment at the current moment on the odd-numbered clutch C1conv_Lining(n) (k) is:

[0151] P C1conv_Lining(n) (k) = h clu1 ·A clu1Lining(n) ·(T C1LiningSeg(n) (k-1)-T C1Seg(n)oillin (k-1));

[0152] On an even-numbered clutch, the cooling power P of the nth friction plate segment at the current moment C2conv_Lining(n) (k) is:

[0153] P C2conv_Lining(n) (k) = h clu2 ·A clu2Lining(n) ·(T C2LiningSeg(n) (k-1)-T C2Seg(n)oillin (k-1)).

[0154] Among them, A clu1Plate(n) , A clu2Plate(n) represents the convection heat transfer area of ​​the nth steel plate segment of the odd-numbered clutch and the even-numbered clutch respectively, A clu1Lining(n) , A clu1Lining(n) Respectively represent the convection heat transfer area of ​​the nth friction plate segment of the odd-numbered clutch and the even-numbered clutch. It can be seen that in the embodiment of the present invention, a specific method for obtaining the cooling power of the steel plate segment or the friction plate segment is proposed, which improves the feasibility of the scheme.

[0155] In one embodiment, step S500, that is, obtaining the heat transfer power of the second clutch to the first clutch at the current moment, specifically includes the following steps:

[0156] S501: Obtaining an effective heat conduction contact area of ​​the second clutch to the first clutch.

[0157] In the present invention, when calculating the heat conduction power of the second clutch to the first clutch at the current moment, it is necessary to first obtain the effective heat conduction contact area of ​​the second clutch to the first clutch. The effective heat conduction contact area of ​​the second clutch to the first clutch includes the effective heat conduction contact area A of the odd-numbered clutch to the even-numbered clutch. C1toC2 , and the effective heat transfer contact area A of the even-numbered clutch to the odd-numbered clutch C2toC1 , where the effective heat conduction contact area can be obtained from the vehicle operating parameters, which will not be described in detail here.

[0158] S502: Obtain the thermal conductivity of the steel plate of the first clutch.

[0159] S503: Obtaining the heat conduction power according to the thermal conductivity of the steel sheet and the effective heat conduction contact area.

[0160] The heat conduction power is obtained according to the thermal conductivity of the steel sheet and the effective heat conduction contact area, which specifically refers to obtaining the heat conduction power of the second clutch to the first clutch at the current moment through the following formula:

[0161] P cond_2to1 (k) = λ Plate ·A 2to1 ·(T 2Plate (k-1)-T 1Plate (k-1));

[0162] Among them, P cond_2to1 (k) represents the heat transfer power of the second clutch to the first clutch at the current moment, λ Plate Indicates the thermal conductivity of steel sheet, A 2to1 represents the effective heat conduction contact area of ​​the second clutch to the first clutch, T 2Plate (k-1) represents the segment temperature of the steel plate segment on the second clutch at the last moment, T 1Plate (k-1) represents the segment temperature of the steel plate segment on the first clutch at the previous moment.

[0163] In the present invention, taking the target segment as the nth steel segment of an odd-numbered clutch as an example, the thermal conductivity coefficient λ of the steel segment is further obtained. plate , and obtain the segment temperature T of the nth steel segment corresponding to the even clutch at the previous moment C2PlateSeg(n) (k-1)). Taking the target segment as the nth friction segment of the odd-numbered clutch as an example, the friction plate thermal conductivity λ of the friction plate segment will be further obtained. lining , and obtain the segment temperature T of the nth friction plate segment corresponding to the even clutch at the previous moment C2LiningSeg(n) (k-1)).

[0164] Therefore, after being divided equally, the heat transfer power P of the odd-numbered clutch to the even-numbered clutch can be obtained respectively. cond_C1toC2 (k), or the heat transfer power P of the even-numbered clutch to the odd-numbered clutch cond_C2toC1 (k), the specific calculation method is as follows:

[0165] Heat transfer power P of odd-numbered clutch to even-numbered clutch cond_C1toC2 (k) is:

[0166] P cond_C1toC2 (k) = λ plate ·A Plate_C1toC2 ·(T C1PlateSeg(n) (k-1)-TC2PlateSeg(n) (k-1));

[0167] P cond_C1toC2 (k) represents the heat transfer power of the odd-numbered clutch to the even-numbered clutch at the current moment;

[0168] A Plate_C1toC2 It represents the effective heat transfer contact area of ​​the odd clutch to the even clutch;

[0169] T C1PlateSeg(n) (k-1) represents the segment temperature of the nth equal steel segment on the odd clutch at a certain moment;

[0170] T C2PlateSeg(n) (k-1)) represents the segment temperature of the nth equal steel plate segment on the even-numbered clutch at a certain moment.

[0171] Heat transfer power P of even clutch to odd clutch cond_C2toC1 (k) is:

[0172] P cond_C2toC1 (k) = λ plate ·A Plate_C2toC1 ·(T C2PlateSeg(n) (k-1)-T C1PlateSeg(n) (k-1));

[0173] P cond_C2toC1 (k) represents the heat transfer power of the even-numbered clutch to the odd-numbered clutch at the current moment;

[0174] A Plate_C2toC1 It represents the effective heat transfer contact area of ​​the even clutch to the odd clutch;

[0175] T C2PlateSeg(n) (k-1) represents the segment temperature of the nth equal steel segment on the even clutch at a certain moment;

[0176] T C1PlateSeg(n) (k-1) represents the segment temperature of the nth equal steel plate segment on the odd-numbered clutch at a certain moment.

[0177] It can be seen that this embodiment proposes a specific implementation method for obtaining the heat conduction power between the first clutch and the second clutch, which improves the feasibility of the solution.

[0178] In one embodiment, in step 600, determining the temperature of the target segment at the current moment according to the segment temperature, sliding power, cooling power and heat conduction power at the previous moment means:

[0179] The temperature of the target steel sheet segment at the current moment is calculated by:

[0180]

[0181] Wherein, T1(k) represents the temperature of the target segment on the first clutch at the current moment, T1(k-1) represents the segment temperature of the target segment on the first clutch at the previous moment, and P cond_2to1 (k) represents the heat transfer power of the second clutch to the first clutch at the current moment, P 1conv (k) represents the cooling power of the target segment on the first clutch, m represents the mass of the target segment, C represents the specific heat capacity corresponding to the target segment, and Δt represents the unit time.

[0182] Correspondingly, when the target segment is an equal number of steel segments, the temperature of the steel segments on the odd-numbered clutch and the even-numbered clutch at the current moment can be calculated by the following formulas:

[0183] The current temperature T of the nth steel segment on the odd clutch C1PlateSeg(n) (k) is:

[0184]

[0185] Among them, represents m C1PlateSeg(n) and C C1Plate It represents the mass and specific heat capacity of the nth steel plate segment on the odd-numbered clutch.

[0186] The current temperature T of the nth steel segment on the odd clutch C2PlateSeg(n) (k) is:

[0187]

[0188] Among them, represents m C2PlateSeg(n) and C C2Plate It represents the mass and specific heat capacity of the nth steel plate segment on an even-numbered clutch.

[0189] Similarly, the temperature of the friction plate segments on the odd-numbered clutch and the even-numbered clutch at the current moment can be calculated by the following formulas:

[0190] The current temperature T of the nth friction plate segment on the odd clutch C1PlateSeg(n) (k) is:

[0191]

[0192] Among them, represents m C1LiningSeg(n) and C C1Lining Represents the mass and specific heat capacity of the nth friction plate segment on an odd-numbered clutch.

[0193] The current temperature T of the nth friction plate segment on the odd clutch C2PlateSeg(n) (k) is:

[0194]

[0195] Among them, represents m C2LiningSeg(n) and C C2Lining Represents the mass and specific heat capacity of the nth friction plate segment on an even-numbered clutch.

[0196] In one embodiment, if Figure 3 As shown, after step S200, if the initial operating state does not meet the preset condition, the method further includes the following steps:

[0197] S700: Acquire the current ambient temperature, the stored segment temperature of the target segment stored when the vehicle was last turned off, and the last stoppage time of the vehicle.

[0198] S800: Determine the temperature of the target segment at the current moment according to the current environment temperature, the temperature of the storage segment and the stop operation time.

[0199] In the embodiment of the present invention, when it is determined that the initial operation state does not meet the preset condition, if the temperature of the target segment at the current moment is calculated based on the sliding power and the heat conduction power, it is verified that the temperature will be inaccurate. Therefore, in the embodiment of the present invention, another method for obtaining the temperature of the target segment at the current moment is provided. Specifically, after it is determined that the initial operation state does not meet the preset condition, the current ambient temperature, the stored segment temperature of the target segment stored when the vehicle was shut down last time, and the last time the vehicle stopped running are obtained.

[0200] Specifically, determining the temperature of the target segment at the current moment according to the current environment temperature, the temperature of the storage segment, and the stop operation time refers to:

[0201] The temperature of the target segment at the current moment is calculated by the following formula:

[0202] T1(k)=T 1Saved -f(T Ambient ,t keyoff );

[0203] Where T1(k) represents the temperature of the target segment on the first clutch at the current moment, T 1Saved represents the storage segment temperature, T Ambient Indicates the current ambient temperature, t keyoff represents the stopping time, f(T Ambient ,t keyoff ) is the attenuation function of the current ambient temperature and the duration of shutdown.

[0204] At this time, after being divided into n equal parts, the temperature T of the nth steel sheet segment on the odd clutch at the current moment is C1PlateSeg(n) (k) is:

[0205] T C1PlateSeg(n) (k) = T C1SavedPlateSeg(n) -f C1Plate (T Ambient ,t keyoff );

[0206]

[0207] The current temperature T of the nth steel segment on the even clutch C2PlateSeg(n) (k) is:

[0208] T C2PlateSeg(n) (k) = T C2SavedPlateSeg(n) -f C2Plate (T Ambient ,t keyoff );

[0209]

[0210] Similarly, after being divided into n equal parts, the temperature T of the nth friction segment on the odd clutch at the current moment is C1LiningSeg(n) (k) is:

[0211] T C1LiningSeg(n) (k) = T C1SavedLiningSeg(n) -f C1Lining (T Ambient ,t keyoff );

[0212]

[0213] The current temperature T of the nth steel segment on the even clutch C2LiningSeg(n) (k) is:

[0214] T C2LiningSeg(n) (k) = T C2SavedLiningSeg(n) -f C2Lining (T Ambient ,t keyoff );

[0215]

[0216] Among them, in the above formula, A air_convIt is a parameter obtained by fitting the test data, and the specific fitting process is not described in detail here. It can be seen that in this embodiment, a method of obtaining the temperature of the steel plate segment or the friction plate segment on the odd-numbered clutch or the even-numbered clutch when judging that the initial operating state does not meet the preset condition is proposed, so that the scheme can adapt to different scenarios with corresponding calculation methods, effectively improving the accuracy of the temperature.

[0217] It should be noted that, in the aforementioned embodiment, the process of how to obtain the temperature of the steel plate and friction plate of the wet dual clutch is further performed to obtain the oil temperature on the target segment in the embodiment of the present invention, specifically, as shown below:

[0218] Oil temperature T of the nth steel plate segment on the odd clutch C1oil_PlateSeg(n) (k) is:

[0219]

[0220] Oil temperature T of the nth friction segment on the odd-numbered clutch C1oil_LiningSeg(n) (k) is:

[0221]

[0222] Among them, m C1PlateSeg(n) 、m C1LiningSeg(n) They represent the mass of the nth steel plate segment and the nth friction plate segment on the odd clutch, respectively, C C1Plate , C C1Lining They respectively represent the specific heat capacity of the nth steel plate segment and the nth friction plate segment on the odd-numbered clutch.

[0223] Similarly, the oil temperature T of the nth steel plate segment on the even-numbered clutch C2oil_PlateSeg(n) (k) is:

[0224]

[0225] Oil temperature T of the nth friction segment on the even-numbered clutch C2oil_LiningSeg(n) (k) is:

[0226]

[0227] Among them, m C2PlateSeg(n) 、m C2LiningSeg(n) They represent the mass of the nth steel plate segment and the nth friction plate segment on the even clutch, respectively, C C2Plate , C C2Lining They respectively represent the specific heat capacity of the nth steel plate segment and the nth friction plate segment on the even-numbered clutch.

[0228] It can be seen that in the present invention, the oil temperature on each equally divided steel plate or friction plate can be further accurately obtained, and the relevant temperature of the clutch can be fully obtained, providing valuable temperature data for subsequent vehicle control. In practical applications, the above acquisition method can be integrated into a transmission controller for application on a real vehicle, and the steel plate segment and / or friction plate segment of the clutch calculated in real time can be used to formulate a more accurate clutch thermal protection control strategy, prevent the clutch thermal protection strategy from being triggered in advance, and prevent clutch ablation, effectively improving vehicle performance.

[0229] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0230] In one embodiment, a wet dual clutch temperature acquisition device is provided, and the wet dual clutch temperature acquisition device corresponds to the wet dual clutch temperature acquisition method in the above embodiment. Figure 3 As shown, the wet dual clutch temperature acquisition device includes a first acquisition module 101, a judgment module 102, a second acquisition module 103, a third acquisition module 104, a fourth acquisition module 105 and a determination module 107. The functional modules are described in detail as follows:

[0231] A first acquisition module 101 is used to acquire vehicle operating parameters, wherein the vehicle operating parameters include an initial operating state of the vehicle;

[0232] A judging module 102 is used to judge whether the initial operation state position meets a preset condition;

[0233] A second acquisition module, configured to acquire the segment temperature of the target segment in the first clutch at a previous moment if the initial operating state meets a preset condition;

[0234] The third acquisition module 103 is used to acquire the sliding power of the target segment and acquire the cooling power of the target segment at the current moment;

[0235] A fourth acquisition module 104, used to acquire the heat conduction power of the second clutch to the first clutch at the current moment;

[0236] The determination module 105 is used to determine the temperature of the target segment at the current moment according to the segment temperature, sliding power, cooling power and heat conduction power at the previous moment.

[0237] In one embodiment, the target segment is a steel plate segment or a friction plate segment.

[0238] In one embodiment, the target fragment is determined by:

[0239] Divide each sleeve steel sheet of the first clutch into n equal steel sheet segments, and use the equal steel sheet segments as the target segments;

[0240] or,

[0241] Each friction plate of the first clutch is divided into n equal friction plate segments, and the equal friction plate segments are used as the target segments.

[0242] In one embodiment, the apparatus further comprises a fifth acquisition module;

[0243] The fifth acquisition module is used to acquire the current ambient temperature, the storage segment temperature of the target segment stored when the vehicle was last turned off, and the last stop operation time of the vehicle if the initial operation state does not meet the preset condition;

[0244] The determination module is used to determine the temperature of the target segment at a current moment according to the current ambient temperature, the temperature of the storage segment and the stop operation time.

[0245] In one embodiment, the determining module is specifically configured to:

[0246] The temperature of the target segment at the current moment is calculated by the following formula:

[0247] T1(k)=T 1Saved -f(T Ambient ,t keyoff );

[0248] Wherein, T1(k) represents the temperature of the target segment at the current moment, T 1Saved represents the storage segment temperature, T Ambient Indicates the current ambient temperature, t keyoff represents the stopping time, f(T Ambient ,t keyoff ) is the attenuation function of the current ambient temperature and the duration of shutdown.

[0249] In one embodiment, the fourth acquisition module is specifically used to:

[0250] obtaining an effective heat conduction contact area between the second clutch and the first clutch;

[0251] Obtaining the thermal conductivity of the steel sheet of the first clutch;

[0252] The heat conduction power is obtained according to the thermal conductivity of the steel sheet and the effective heat conduction contact area.

[0253] In one embodiment, the fourth acquisition module is specifically used to:

[0254] The heat transfer power of the second clutch to the first clutch at the current moment is obtained by the following formula:

[0255] P cond_2to1 (k) = λ Plate ·A 2to1 ·(T 2Plate (k-1)-T 1Plate (k-1));

[0256] Among them, P cond_2to1 (k) represents the heat conduction power, λ Plate Indicates the thermal conductivity of the steel sheet, A 2to1 represents the effective heat conduction contact area of ​​the second clutch to the first clutch, T 2Plate (k-1) represents the segment temperature of the steel plate segment on the second clutch at the last moment, T 1Plate (k-1) represents the segment temperature of the steel plate segment on the first clutch at the previous moment.

[0257] In one embodiment, the determining module is further specifically configured to:

[0258] The temperature of the target steel sheet segment at the current moment is calculated by:

[0259]

[0260] Wherein, T1(k) represents the temperature of the target segment at the current moment, T1(k-1) represents the segment temperature of the target segment at the previous moment, and P cond_2to1 (k) represents the heat conduction power, P 1conv (k) represents the cooling power, m represents the mass of the target segment, C represents the specific heat capacity corresponding to the target segment, and Δt represents the unit time.

[0261] In one embodiment, the third acquisition module is specifically used to:

[0262] Acquiring an engine speed of the vehicle, a clutch speed corresponding to the first clutch, and a clutch transmission torque;

[0263] Determining a total slip power corresponding to the first clutch according to an engine speed, a clutch speed, and a clutch transmission torque of the vehicle;

[0264] Determining the ratio of the sliding friction power of the target segment to the total sliding friction power;

[0265] The sliding friction power of the target segment is determined according to the total sliding friction power and the ratio.

[0266] In one embodiment, the third acquisition module is further specifically used for:

[0267] Acquiring the inlet oil temperature of the target segment at the previous moment;

[0268] Obtaining the Reynolds number, Prandtl number, thermal conductivity of lubricating oil and characteristic length corresponding to the target segment;

[0269] Determining the convective heat transfer coefficient of the target segment relative to the lubricating oil according to the Reynolds number, the Prandtl number, the thermal conductivity of the lubricating oil and the characteristic length;

[0270] The cooling power of the target segment at the current moment is determined according to the segment temperature, the inlet oil temperature and the convection heat transfer coefficient at the previous moment.

[0271] It can be seen that the present invention provides a wet dual-clutch temperature acquisition device, which can calculate the temperature of the steel plate segments and / or friction plate segments of the odd-numbered clutches, and can also calculate the temperature of the steel plate segments and / or friction plate segments of the even-numbered clutches. When calculating the temperature of the clutch-related segments, not only factors such as sliding power are considered, but also the influence of heat conduction between the inner and outer clutches when sliding between the clutches is further considered, and the corresponding heat conduction power between the two clutches is calculated, so that the temperatures of the inner and outer clutch steel plates and friction plate-related segments can be accurately calculated, thereby improving the accuracy of the clutch-related temperatures and helping to provide accurate temperature data for other control functions of the vehicle.

[0272] The specific definition of the wet dual clutch temperature acquisition device can be found in the definition of the wet dual clutch temperature acquisition method above, which will not be repeated here. Each module in the above-mentioned wet dual clutch temperature acquisition device can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0273] In one embodiment, a wet dual clutch temperature acquisition device is provided, and its internal structure diagram can be as follows: Figure 4 As shown. The wet dual clutch temperature acquisition device includes a processor, a memory, a network interface and a database connected through a system bus. Among them, the processor of the wet dual clutch temperature acquisition device is used to provide computing and control capabilities. The memory of the computer device includes a storage medium and an internal memory. The storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the storage medium. When the computer program in the wet dual clutch temperature acquisition device is executed by the processor, a wet dual clutch temperature acquisition method is implemented.

[0274] In one embodiment, a wet dual clutch temperature acquisition device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the following steps are implemented:

[0275] Acquiring vehicle operating parameters, wherein the vehicle operating parameters include an initial operating state of the vehicle;

[0276] Determining whether the initial operation status bit meets a preset condition;

[0277] If the initial operating state meets the preset condition, obtaining the segment temperature of the target segment in the first clutch at the last moment;

[0278] Acquire the sliding power of the target segment, and acquire the cooling power of the target segment at the current moment;

[0279] Obtaining heat transfer power from the second clutch to the first clutch at the current moment;

[0280] The temperature of the target segment at the current moment is determined according to the segment temperature, the sliding power, the cooling power and the heat conduction power at the previous moment.

[0281] In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0282] Acquiring vehicle operating parameters, wherein the vehicle operating parameters include an initial operating state of the vehicle;

[0283] Determining whether the initial operation status bit meets a preset condition;

[0284] If the initial operating state meets the preset condition, obtaining the segment temperature of the target segment in the first clutch at the last moment;

[0285] Acquire the sliding power of the target segment, and acquire the cooling power of the target segment at the current moment;

[0286] Obtaining heat transfer power from the second clutch to the first clutch at the current moment;

[0287] The temperature of the target segment at the current moment is determined according to the segment temperature, the sliding power, the cooling power and the heat conduction power at the previous moment.

[0288] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0289] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0290] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A method for obtaining temperature of a wet dual clutch, characterized in that: include: Acquiring vehicle operating parameters, wherein the vehicle operating parameters include an initial operating state of the vehicle; Determining whether the initial operation status bit meets a preset condition; If the initial operating state meets the preset condition, obtaining the segment temperature of the target segment in the first clutch at the last moment; Acquire the sliding power of the target segment, and acquire the cooling power of the target segment at the current moment; Obtaining heat transfer power from the second clutch to the first clutch at the current moment; Determining the temperature of the target segment at the current moment according to the segment temperature, sliding power, cooling power and heat conduction power at the previous moment; The determining the temperature of the target segment at the current moment according to the segment temperature, sliding power, cooling power and heat conduction power at the previous moment comprises: The temperature of the target segment at the current moment is calculated as follows: ； in, represents the temperature of the target segment at the current moment, The fragment temperature of the target fragment at the last moment, represents the heat conduction power, represents the cooling power, represents the quality of the target fragment, represents the specific heat capacity corresponding to the target fragment, Indicates unit duration.

2. The method for obtaining the temperature of a wet dual clutch according to claim 1, characterized in that: The target fragment is determined by: Divide each sleeve steel sheet of the first clutch into n equal steel sheet segments, and use the equal steel sheet segments as the target segments; or, Each friction plate of the first clutch is divided into n equal friction plate segments, and the equal friction plate segments are used as the target segments.

3. The wet dual clutch temperature acquisition method according to claim 2, characterized in that: The method further comprises: If the initial operation state does not meet the preset condition, obtaining the current ambient temperature, the storage segment temperature of the target segment stored when the vehicle was last turned off, and the last stop operation time of the vehicle; The temperature of the target segment at the current moment is determined according to the current ambient temperature, the temperature of the storage segment and the stop operation time.

4. The method for obtaining the temperature of a wet dual clutch according to claim 3, characterized in that: The determining the temperature of the target segment at the current moment according to the current ambient temperature, the temperature of the storage segment and the stop operation time includes: The temperature of the target segment at the current moment is calculated by the following formula: ； in, represents the temperature of the target segment at the current moment, represents the storage segment temperature, represents the current ambient temperature, Indicates the duration of the stop operation. is a decay function associated with the current ambient temperature and the duration of shutdown.

5. The method for obtaining the temperature of a wet dual clutch according to any one of claims 1 to 4, characterized in that: The obtaining of the heat transfer power of the second clutch to the first clutch at the current moment includes: obtaining an effective heat conduction contact area between the second clutch and the first clutch; Obtaining the thermal conductivity of the steel sheet of the first clutch; The heat conduction power is obtained according to the thermal conductivity of the steel sheet and the effective heat conduction contact area.

6. The method for obtaining the temperature of a wet dual clutch according to claim 5, characterized in that: The obtaining of the heat conduction power according to the thermal conductivity of the steel sheet and the effective heat conduction contact area comprises: The heat transfer power of the second clutch to the first clutch at the current moment is obtained by the following formula: ； in, represents the heat conduction power, represents the thermal conductivity of the steel sheet, represents the effective heat conduction contact area of ​​the second clutch to the first clutch, represents the segment temperature of the steel plate segment on the second clutch at the last moment, Indicates the segment temperature of the steel plate segment on the first clutch at the previous moment.

7. The method for obtaining the temperature of a wet dual clutch according to any one of claims 1 to 4, characterized in that: The obtaining of the cooling power of the target segment at the current moment includes: Acquiring the inlet oil temperature of the target segment at the previous moment; Obtaining the Reynolds number, Prandtl number, thermal conductivity of lubricating oil and characteristic length corresponding to the target segment; Determining the convective heat transfer coefficient of the target segment relative to the lubricating oil according to the Reynolds number, the Prandtl number, the thermal conductivity of the lubricating oil and the characteristic length; The cooling power of the target segment at the current moment is determined according to the segment temperature, the inlet oil temperature and the convection heat transfer coefficient at the previous moment.

8. A wet dual clutch temperature acquisition device, characterized in that: include: A first acquisition module, used for acquiring vehicle operation parameters, wherein the vehicle operation parameters include an initial operation state of the vehicle; A judging module, used to judge whether the initial operation status position meets a preset condition; A second acquisition module, configured to acquire the segment temperature of the target segment in the first clutch at a previous moment if the initial operating state meets a preset condition; A third acquisition module is used to acquire the sliding power of the target segment and acquire the cooling power of the target segment at a current moment; A fourth acquisition module, used for acquiring the heat conduction power of the second clutch to the first clutch at the current moment; A determination module, used to determine the temperature of the target segment at a current moment according to the segment temperature, sliding power, cooling power and heat conduction power at the previous moment; The determining the temperature of the target segment at the current moment according to the segment temperature, sliding power, cooling power and heat conduction power at the previous moment comprises: The temperature of the target segment at the current moment is calculated as follows: ； in, represents the temperature of the target segment at the current moment, The fragment temperature of the target fragment at the last moment, represents the heat conduction power, represents the cooling power, represents the quality of the target fragment, represents the specific heat capacity corresponding to the target fragment, Indicates unit duration.

9. A wet dual clutch temperature acquisition device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the wet dual clutch temperature acquisition method as described in any one of claims 1-7 is implemented.

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