CN104049650A - Wet-type DCT clutch temperature control system based on fuzzy control and control method thereof - Google Patents

Abstract

The invention discloses a wet-type DCT clutch temperature control system based on fuzzy control and a control method of the wet-type DCT clutch temperature control system. The system is composed of a sensor detection module, a signal processing module and a master control module. The method comprises the steps that after the temperature of oil thrown out of an oil outlet of a wet-type DCT clutch, the rotating speed of an input shaft of a transmission, the rotating speed of a driven disk of a first clutch, the rotating speed of a driven disk of a second clutch, the pressure of the first clutch and the pressure of the second clutch are collected in real time, whether the temperature of the oil thrown out of the oil outlet of the wet-type DCT clutch is larger than or equal to a threshold is judged; if the temperature of the oil thrown out of the oil outlet of the wet-type DCT clutch is smaller than the threshold, a current constant control mode of a cooling solenoid valve is switched to; if the temperature of the oil thrown out of the oil outlet of the wet-type DCT clutch is larger than or equal to the threshold, calculated clutch temperature deviation delta Tc, clutch temperature deviation change rate d delta Tc/dt and sliding friction power P are used as input variables for fuzzy control, a three-input single-output fuzzy control mode is switched to, and the current of the cooling solenoid valve is obtained. The wet-type DCT clutch temperature control system based on fuzzy control is simple, convenient and fast to use and capable of achieving quick and accurate control over clutch temperature.

Description

Wet type DCT clutch temp control system and control method thereof based on fuzzy control

Technical field

The present invention relates to a kind of wet type DCT clutch temp control system and control method, especially a kind of wet type DCT clutch temp control system and control method thereof based on fuzzy control.

Background technology

At present, there is the speed change gear of two types to be widely used in traditional motor vehicles.Be a manual transmission, by the gear engagement position of stirring in shift lever switching variator, change ratio of gear, thereby reach the object of speed change; For this manual transmission, in driving procedure, driver needs controlled clutch pedal and shift lever frequently, easily makes driver produce sense of fatigue, thus the security of impact driving.Another kind is automatic transmission, can automatically change gear ratio according to vehicle-state, has alleviated driver's burden, has improved the security of driving, and automatic transmission can adapt to various road conditions and the driving styles of travelling simultaneously.Therefore, the vehicle of equipment automatic transmission becomes one of trend of China Automobile Industry gradually.

Common automatic gearbox can be divided into four kinds: hydraulic automatic speed variator (AT), electric control mechanical type automatic speed variator (AMT), buncher (CVT) and double-clutch automatic gearbox (DCT).Wherein, DCT is a kind of new type auto variator that recent domestic Automobile Enterprises and researcher pay close attention to, and its structure of controlling respectively odd number shelves and even number shelves by double clutch has realized power shift.Compare with other several automatic transmission, DCT had both inherited the high advantage of AMT fuel efficiency, had retained again AT, the smooth-going advantage of CVT gear shift, simultaneously due to the very short gearshift time, make it have good dynamic property, be therefore with a wide range of applications and good market outlook.

Different according to the type of the clutch coupling that in DCT, double clutch part adopts, can be divided into dry type DCT and the large class of wet type DCT two.Though dry type DCT has compact conformation, transmission efficiency high, because thermal capacity own is little, there is no forced cooling device, heat dispersion is poor, easily produces localized hyperthermia, causes shorten serviceable life.Comparatively speaking, though wet type DCT clutch coupling pressure distribution evenly, the transmitting torque of solenoidoperated cluthes accurately, allow the starting cunning of long period to rub and high tap position starting, technology comparative maturity, be widely used, but need to be equipped with cold oil forced heat radiation system, and thermal capacity own is larger.

Because the friction pair number of wet type DCT is more, in frequently in conjunction with detachment process, can produce a large amount of heat energy.Because thermal capacity own is large, the speed of thermal change is slow in addition, shorter in conjunction with disengaging time in the situation that, because clutch friction pair can not get fully coolingly can causing accumulation of heat.Too high temperature can affect the control accuracy of clutch coupling, adds wearing and tearing and the thermal failure of speed clutch, affects the life-span of clutch coupling.Meanwhile, the too high cold oil that also can make of clutch temp exceeds temperature range and goes bad.Therefore, can effectively control most important to wet type DCT clutch temp.

At present, the vehicle of equipment wet type DCT is actual in look-up table solenoidoperated cluthes temperature, the clutch coupling oil-out recording according to clutch temp sensor throws away oil temperature, by inquiring about temperature-cool stream scale of artificial setting, obtain the uninterrupted of required cooling electric magnet valve, again according to the electric current-rating curve of cooling electric magnet valve itself, obtain corresponding cooling electric magnet valve current value, thus solenoidoperated cluthes temperature.Cooling electric magnet valve is electro-hydraulic proportional valve, electromagnetic valve current size and the cooling uninterrupted relation that is inversely proportional to.Yet, because the clutch temp sensor adopting is thermistor (temperature) sensor, its approximate transfer function is first order inertial loop, have compared with large time delay, be that Current Temperatures need could accurately be reflected by sensor after a period of time, be greater than 0.5s common retardation time, easily cause clutch coupling cooling not in time, insufficient, damage friction disc.In addition because clutch temp control system has the features such as non-linear, complicacy, dynamic, the control mode of above-mentioned look-up table causes control accuracy low, clutch temp rate of change is not had to inhibiting effect, can cause temperature fluctuation larger, affect the normal work of clutch coupling.

Therefore, this area need a kind of can realize clutch temp fast, the wet type DCT clutch temp control method accurately controlled, with solenoidoperated cluthes temperature rise, extend its life-span and promote the serviceability of DCT vehicle.

Summary of the invention

The technical problem to be solved in the present invention is to overcome response delay and the low deficiency of clutch temp control accuracy that in prior art, clutch oil temperature sensor exists, and a kind of wet type DCT clutch temp control system based on fuzzy control is provided.

Another technical matters that the present invention will solve is for providing a kind of control method of the above-mentioned wet type DCT clutch temp control system based on fuzzy control.

For solving technical matters of the present invention, the technical scheme adopting is: the wet type DCT clutch temp control system based on fuzzy control comprises that clutch coupling oil-out throws away the collection of oil temperature and the output of cooling electromagnetic valve current is controlled, particularly,

Consisting of of described control system,

Sensor detection module, throws away oil temperature, transmission input shaft rotating speed, clutch coupling 1 clutch plate rotating speed, clutch coupling 2 clutch plate rotating speeds, clutch coupling 1 pressure and clutch coupling 2 pressure for obtaining the clutch coupling oil-out of wet type DCT;

Signal processing module, carries out filter shape processing to suppress noise, to improve signal quality for the signal that sensor detection module is collected, and exports main control module to;

Main control module, it consists of computing module and control module, wherein,

Computing module, for the clutch coupling oil-out after processing according to described signal processing module, throw away oil temperature, transmission input shaft rotating speed, clutch coupling 1 clutch plate rotating speed, clutch coupling 2 clutch plate rotating speeds, clutch coupling 1 pressure and clutch coupling 2 calculation of pressure clutch temp deviations, clutch temp deviation variation rate and unit friction power

Control module, for the signal after processing according to described signal processing module and the result of calculation of described computing module, judges applicable control mode, and calculates and send corresponding current signal to cooling electric magnet valve.

Further improvement as the wet type DCT clutch temp control system based on fuzzy control:

Described sensor detection module is preferably comprised of clutch oil temperature sensor, transmission input shaft speed probe, clutch coupling 1 clutch plate speed probe, clutch coupling 2 clutch plate speed probes, clutch coupling 1 pressure transducer and clutch coupling 2 pressure transducers.

For solving another technical matters of the present invention, another technical scheme adopting is: the control method of the above-mentioned wet type DCT clutch temp control system based on fuzzy control comprises that clutch coupling oil-out throws away the Real-time Collection of oil temperature and the output of cooling electromagnetic valve current is controlled, and particularly key step is as follows:

Step 1, the threshold value of setpoint clutch temperature is >=70 ℃;

Step 2, the clutch coupling oil-out of Real-time Collection wet type DCT throws away oil temperature, transmission input shaft rotating speed, clutch coupling 1 clutch plate rotating speed, clutch coupling 2 clutch plate rotating speeds, clutch coupling 1 pressure and clutch coupling 2 pressure, do you and judge whether clutch coupling oil-out throws away oil temperature >=threshold value? if clutch coupling oil-out throws away oil temperature < threshold value, turn cooling electric magnet valve current constant control mode, if clutch coupling oil-out throws away oil temperature >=threshold value, turn three input list output fuzzy control methods;

Step 3, three input single processes of exporting fuzzy control methods is,

Step 3.1, throws away oil temperature, transmission input shaft rotating speed, clutch coupling 1 clutch plate rotating speed, clutch coupling 2 clutch plate rotating speeds, clutch coupling 1 pressure and clutch coupling 2 pressure by the clutch coupling oil-out of Real-time Collection in step 2 and draws as calculated clutch temp deviation delta T _c, clutch temp deviation variation rate d Δ T _c/ dt and unit friction power P, and by clutch temp deviation delta T _c, clutch temp deviation variation rate d Δ T _c/ dt and unit friction power P are as input variable, and cooling electric magnet valve electric current I, as output variable, is set fuzzy set and the domain scope thereof of each input/output variable simultaneously,

Step 3.2, first by clutch temp deviation delta T _c, clutch temp deviation variation rate d Δ T _c/ dt and unit friction power P, as the input variable of fuzzy control, arrive domain scope separately through change of scale, then obtain fuzzy value separately by the membership function of normal distribution,

Step 3.3, first by the fuzzy value of input variable and the fuzzy control rule of setting, by Mamdani rationalistic method, carry out fuzzy reasoning, and by MIN-MAX method, carry out fuzzy composition computing and draw output variable, again output variable is converted to after accurate amount by gravity model appoach, through change of scale, transformed to actual output area, obtained cooling electromagnetic valve current.

Further improvement as the control method of the wet type DCT clutch temp control system based on fuzzy control:

Preferably, the electric current of the cooling electric magnet valve of cooling electric magnet valve current constant control mode is 1100mA.

Preferably, calculate clutch temp deviation delta T _cformula be Δ T _c=T _c-T _o, the T in formula _cfor clutch coupling oil-out throws away oil temperature, T _ofor temperature threshold.

Preferably, calculate clutch temp deviation variation rate d Δ T _cthe formula of/dt is

Δ T in formula _c(k-1) be clutch temp deviation, the Δ T gathering for the k-1 time _c(k) be that clutch temp deviation, the Δ t gathering for the k time is the sampling period of clutch temp deviation.

Preferably, the formula of calculating unit friction power P is

$P=|T_{q1}\&CenterDot;\frac{2\mathrm{\&pi;}}{60}(n_i-n_{c1})|+|T_{q2}\&CenterDot;\frac{2\mathrm{\&pi;}}{60}(n_i-n_{c2})|,$ T in formula _q1, T _q2for moment of torsion, the n that under the sliding state that rubs, clutch coupling 1,2 transmits _ifor transmission input shaft rotating speed, n _c1, n _c2for clutch coupling 1,2 clutch plate rotating speeds; Wherein, under the sliding state that rubs of calculating, the formula of clutch transmission torque is

Δ ω in formula _crspeed discrepancy, sign (Δ ω for transmission input shaft and clutch driven plate _cr) be sign function, $\mathrm{sign}\left({\mathrm{\&Delta;\&omega;}}_{\mathrm{cr}}\right)=\left\{\begin{array}{cc}1,& {\mathrm{\&Delta;\&omega;}}_{\mathrm{cr}}>0\\ -1,& {\mathrm{\&Delta;\&omega;}}_{\mathrm{cr}}\&le;0\end{array}\right.,$ μ _dfor kinetic friction coefficient, the S of friction of wet clutch is clutch plunger active area, P _nfor the applied pressure in the piston unit area of clutch coupling, Z are the secondary number of clutch friction, R ₀, R ₁be respectively friction disc external diameter, the internal diameter of clutch coupling.

Preferably, clutch temp deviation delta T _cfuzzy set be { VST, ST, RST, MT, RBT, BT, VBT}, clutch temp deviation variation rate d Δ T _cthe fuzzy set of/dt be NB, NM, NS, O, PS, PM, PB}, the fuzzy set of unit friction power P be VSP, SP, MP, RBP, BP, VBP}, the fuzzy set of cooling electric magnet valve electric current I be VSI, SI, MI, RBI, BI, VBI},

Clutch temp deviation delta T _cbasic domain be [0,70], domain is [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14], quantizing factor k ₁=14/70=0.2, clutch temp deviation variation rate d Δ T _cthe basic domain of/dt is [20,20], and domain is [6 ,-5 ,-4 ,-3 ,-2 ,-1,0,1,2,3,4,5,6], quantizing factor k ₂=6/20=0.3, the basic domain of unit friction power P is [0,20], domain is [0,1,2,3,4,5,6,7,8,9,10], quantizing factor k ₃=10/20=0.5, the basic domain of cooling electric magnet valve electric current I is [0,1200], domain is [0,1,2,3,4,5,6,7,8,9,10,11,12], scale factor k ₄=1200/12=100.

Preferably, the membership function of normal distribution is

Preferably, fuzzy control rule is as shown in the table,

, regular sentence connectives and wherein adopts cap, sentence connectives also to adopt cup.

Beneficial effect with respect to prior art is:

Control through using the present invention to carry out the temperature of wet type DCT clutch coupling under stand environment, confirmed that the present invention has overcome the response delay that in prior art, clutch oil temperature sensor exists and the low deficiency of clutch temp control accuracy, has realized the control fast and accurately to wet type DCT clutch temp.

Accompanying drawing explanation

Fig. 1 is a kind of basic structure schematic diagram of control system in the present invention.

Fig. 2 is a kind of basic step procedure chart of control method in the present invention.

Fig. 3 is the procedure chart of fuzzy control in control method in the present invention.

Fig. 4 is used the present invention to carry out one of design sketch after management and control to the clutch coupling of wet type DCT.Wherein, Fig. 4 a is clutch temp deviation curve; Fig. 4 b is clutch slipping powertrace; Fig. 4 c is clutch temp change of error rate curve; Fig. 4 d is cooling electric magnet valve current curve.

Embodiment

Below in conjunction with accompanying drawing, describe the specific embodiment of the present invention in detail, the embodiment describing by reference to accompanying drawing is exemplary, only for explaining the present invention, and can not be interpreted as limitation of the present invention.

Referring to Fig. 1, wet type DCT clutch temp control system based on fuzzy control is placed in the outside of automatic transmission electronic control unit (TCU), it comprises sensor detection module, signal processing module, main control module, and main control module wherein contains computing module and control module.Wherein,

Sensor detection module, throws away oil temperature, transmission input shaft rotating speed, clutch coupling 1 clutch plate rotating speed, clutch coupling 2 clutch plate rotating speeds, clutch coupling 1 pressure and clutch coupling 2 pressure for obtaining the clutch coupling oil-out of wet type DCT; Generally, this sensor detection module is used clutch oil temperature sensor, transmission input shaft speed probe, clutch coupling 1 clutch plate speed probe, clutch coupling 2 clutch plate speed probes, clutch coupling 1 pressure transducer and clutch coupling 2 pressure transducer obtaining informations.Or, clutch coupling oil-out throws away oil temperature, transmission input shaft rotating speed, clutch coupling 1 clutch plate rotating speed, clutch coupling 2 clutch plate rotating speeds, clutch coupling 1 pressure and clutch coupling 2 pressure and also can for example, by communication bus (CAN bus), obtain at other module place by vehicle, in such cases, the communication module that is applicable to this bus can be embedded in TCU inside.

Signal processing module, carries out filter shape processing to suppress noise, to improve signal quality for the signal that sensor detection module is collected, and exports main control module to.

Computing module in main control module, throws away oil temperature, transmission input shaft rotating speed, clutch coupling 1 clutch plate rotating speed, clutch coupling 2 clutch plate rotating speeds, clutch coupling 1 pressure and clutch coupling 2 calculation of pressure clutch temp deviations, clutch temp deviation variation rate and unit friction power for the clutch coupling oil-out after processing according to signal processing module.In the present embodiment, the sampling period of clutch temp deviation is 10ms.

Control module in main control module, relates generally to two kinds of control modes, is respectively cooling electric magnet valve current constant control mode and the single output of three inputs fuzzy control method.Three inputs refer to clutch temp deviation, clutch temp deviation variation rate and unit friction power, and single output refers to cooling electromagnetic valve current.Above-mentioned two kinds of control modes are meeting under certain condition and can mutually change.

Referring to Fig. 2 and Fig. 3, control method of the present invention comprises that clutch coupling oil-out throws away the Real-time Collection of oil temperature and the output of cooling electromagnetic valve current is controlled, and its key step is as follows:

Step 1, the threshold value of setpoint clutch temperature is >=70 ℃.

Step 2, the clutch coupling oil-out of Real-time Collection wet type DCT throws away oil temperature, transmission input shaft rotating speed, clutch coupling 1 clutch plate rotating speed, clutch coupling 2 clutch plate rotating speeds, clutch coupling 1 pressure and clutch coupling 2 pressure, do you and judge whether clutch coupling oil-out throws away oil temperature >=threshold value? if clutch coupling oil-out throws away oil temperature < threshold value, turn cooling electric magnet valve current constant control mode, the electric current of setting cooling electric magnet valve is 1100mA.If clutch coupling oil-out throws away oil temperature >=threshold value, turn three input list output fuzzy control methods.

Step 3, three input single processes of exporting fuzzy control methods is,

Step 3.1, throws away oil temperature, transmission input shaft rotating speed, clutch coupling 1 clutch plate rotating speed, clutch coupling 2 clutch plate rotating speeds, clutch coupling 1 pressure and clutch coupling 2 pressure by the clutch coupling oil-out of step 2 Real-time Collection and draws as calculated clutch temp deviation delta T _c, clutch temp deviation variation rate d Δ T _c/ dt and unit friction power P; Wherein,

Calculate clutch temp deviation delta T _cformula be Δ T _c=T _c-T _o, the T in formula _cfor clutch coupling oil-out throws away oil temperature, T _ofor temperature threshold.

Calculate clutch temp deviation variation rate d Δ T _cthe formula of/dt is

Δ T in formula _c(k-1) be clutch temp deviation, the Δ T gathering for the k-1 time _c(k) be that clutch temp deviation, the Δ t gathering for the k time is the sampling period of clutch temp deviation.

The formula that calculates unit friction power P is

$P=|T_{q1}\&CenterDot;\frac{2\mathrm{\&pi;}}{60}(n_i-n_{c1})|+|T_{q2}\&CenterDot;\frac{2\mathrm{\&pi;}}{60}(n_i-n_{c2})|,$ T in formula _q1, T _q2for moment of torsion, the n that under the sliding state that rubs, clutch coupling 1,2 transmits _ifor transmission input shaft rotating speed, n _c1, n _c2for clutch coupling 1,2 clutch plate rotating speeds; Wherein, under the sliding state that rubs of calculating, the formula of clutch transmission torque is

Δ ω in formula _crspeed discrepancy, sign (Δ ω for transmission input shaft and clutch driven plate _cr) be sign function, $\mathrm{sign}\left({\mathrm{\&Delta;\&omega;}}_{\mathrm{cr}}\right)=\left\{\begin{array}{cc}1,& {\mathrm{\&Delta;\&omega;}}_{\mathrm{cr}}>0\\ -1,& {\mathrm{\&Delta;\&omega;}}_{\mathrm{cr}}\&le;0\end{array}\right.,$ μ _dfor kinetic friction coefficient, the S of friction of wet clutch is clutch plunger active area, P _nfor the applied pressure in the piston unit area of clutch coupling, Z are the secondary number of clutch friction, R ₀, R ₁be respectively friction disc external diameter, the internal diameter of clutch coupling.

And by clutch temp deviation delta T _c, clutch temp deviation variation rate d Δ T _c/ dt and unit friction power P are as input variable, and cooling electric magnet valve electric current I, as output variable, is set fuzzy set and the domain scope thereof of each input/output variable simultaneously.Wherein,

Clutch temp deviation delta T _cfuzzy set be { VST, ST, RST, MT, RBT, BT, VBT}, clutch temp deviation variation rate d Δ T _cthe fuzzy set of/dt be NB, NM, NS, O, PS, PM, PB}, the fuzzy set of unit friction power P be VSP, SP, MP, RBP, BP, VBP}, the fuzzy set of cooling electric magnet valve electric current I be VSI, SI, MI, RBI, BI, VBI},

Clutch temp deviation delta T _cbasic domain be [0,70], domain is [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14], quantizing factor k ₁=14/70=0.2, clutch temp deviation variation rate d Δ T _cthe basic domain of/dt is [20,20], and domain is [6 ,-5 ,-4 ,-3 ,-2 ,-1,0,1,2,3,4,5,6], quantizing factor k ₂=6/20=0.3, the basic domain of unit friction power P is [0,20], domain is [0,1,2,3,4,5,6,7,8,9,10], quantizing factor k ₃=10/20=0.5, the basic domain of cooling electric magnet valve electric current I is [0,1200], domain is [0,1,2,3,4,5,6,7,8,9,10,11,12], scale factor k ₄=1200/12=100.

Step 3.2, first by clutch temp deviation delta T _c, clutch temp deviation variation rate d Δ T _c/ dt and unit friction power P, as the input variable of fuzzy control, arrive domain scope separately through change of scale; Membership function by normal distribution obtains fuzzy value separately again; Wherein, the membership function of normal distribution is $\mathrm{\&mu;}\left(x\right)=\exp [-\frac{{(x-a)}^2}{2{\mathrm{\&sigma;}}^2}].$

Step 3.3, first by the fuzzy value of input variable and the fuzzy control rule of setting, carries out fuzzy reasoning by Mamdani rationalistic method, and by MIN-MAX method, carries out fuzzy composition computing and draw output variable; Wherein, fuzzy control rule is as shown in the table,

, regular sentence connectives and wherein adopts cap, sentence connectives also to adopt cup, and the fuzzy implication relation of Mamdani rationalistic method is represented by cartesian product.

Output variable is converted to after accurate amount by gravity model appoach again, through change of scale, to actual output area, obtain cooling electromagnetic valve current, non-Defuzzication adopts gravity model appoach, finally tries to achieve the exact value of output quantity, then is multiplied by the k of scale factor described in step 3.1 ₄, obtain the current value of cooling electric magnet valve.

For verifying implementation result of the present invention, under stand environment, by the control system being embedded in TCU, carried out the checking that wet type DCT clutch temp is controlled.Obtained control design sketch as shown in Figure 4, from this figure, can find out that control method of the present invention had both had good inhibiting effect to the variation of clutch temp rate of change and unit friction power, robustness is stronger, can realize again clutch temp and control fast and accurately simultaneously.

Embodiment shown in above foundation is graphic describes structure of the present invention, feature and action effect in detail; it described in it, is only preferred embodiment of the present invention; but the present invention does not limit practical range with shown in drawing; every change of doing according to conception of the present invention; or be revised as the equivalent embodiment of equivalent variations; when not exceeding yet instructions and illustrating contain spiritual, all should be in protection scope of the present invention.

Claims (10)

1. the wet type DCT clutch temp control system based on fuzzy control, comprises that clutch coupling oil-out throws away the collection of oil temperature and the output of cooling electromagnetic valve current is controlled, and it is characterized in that:

Consisting of of described control system,

Sensor detection module, throws away oil temperature, transmission input shaft rotating speed, clutch coupling 1 clutch plate rotating speed, clutch coupling 2 clutch plate rotating speeds, clutch coupling 1 pressure and clutch coupling 2 pressure for obtaining the clutch coupling oil-out of wet type DCT;

Signal processing module, carries out filter shape processing to suppress noise, to improve signal quality for the signal that sensor detection module is collected, and exports main control module to;

Main control module, it consists of computing module and control module, wherein,

Computing module, for the clutch coupling oil-out after processing according to described signal processing module, throw away oil temperature, transmission input shaft rotating speed, clutch coupling 1 clutch plate rotating speed, clutch coupling 2 clutch plate rotating speeds, clutch coupling 1 pressure and clutch coupling 2 calculation of pressure clutch temp deviations, clutch temp deviation variation rate and unit friction power

Control module, for the signal after processing according to described signal processing module and the result of calculation of described computing module, judges applicable control mode, and calculates and send corresponding current signal to cooling electric magnet valve.

2. the wet type DCT clutch temp control system based on fuzzy control according to claim 1, is characterized in that sensor detection module is comprised of clutch oil temperature sensor, transmission input shaft speed probe, clutch coupling 1 clutch plate speed probe, clutch coupling 2 clutch plate speed probes, clutch coupling 1 pressure transducer and clutch coupling 2 pressure transducers.

3. a control method for the wet type DCT clutch temp control system based on fuzzy control described in claim 1, comprises that clutch coupling oil-out throws away the control of Real-time Collection and the cooling electromagnetic valve current of oil temperature, is characterized in that key step is as follows:

Step 1, the threshold value of setpoint clutch temperature is >=70 ℃;

Step 2, the clutch coupling oil-out of Real-time Collection wet type DCT throws away oil temperature, transmission input shaft rotating speed, clutch coupling 1 clutch plate rotating speed, clutch coupling 2 clutch plate rotating speeds, clutch coupling 1 pressure and clutch coupling 2 pressure, do you and judge whether clutch coupling oil-out throws away oil temperature >=threshold value? if clutch coupling oil-out throws away oil temperature < threshold value, turn cooling electric magnet valve current constant control mode, if clutch coupling oil-out throws away oil temperature >=threshold value, turn three input list output fuzzy control methods;

Step 3, three input single processes of exporting fuzzy control methods is,

Step 3.1, throws away oil temperature, transmission input shaft rotating speed, clutch coupling 1 clutch plate rotating speed, clutch coupling 2 clutch plate rotating speeds, clutch coupling 1 pressure and clutch coupling 2 pressure by the clutch coupling oil-out of Real-time Collection in step 2 and draws as calculated clutch temp deviation delta T _c, clutch temp deviation variation rate d Δ T _c/ dt and unit friction power P, and by clutch temp deviation delta T _c, clutch temp deviation variation rate d Δ T _c/ dt and unit friction power P are as input variable, and cooling electric magnet valve electric current I, as output variable, is set fuzzy set and the domain scope thereof of each input/output variable simultaneously,

Step 3.2, first by clutch temp deviation delta T _c, clutch temp deviation variation rate d Δ T _c/ dt and unit friction power P, as the input variable of fuzzy control, arrive domain scope separately through change of scale, then obtain fuzzy value separately by the membership function of normal distribution,

Step 3.3, first by the fuzzy value of input variable and the fuzzy control rule of setting, by Mamdani rationalistic method, carry out fuzzy reasoning, and by MIN-MAX method, carry out fuzzy composition computing and draw output variable, again output variable is converted to after accurate amount by gravity model appoach, through change of scale, to actual output area, obtain cooling electromagnetic valve current.

4. the control method of the wet type DCT clutch temp control system based on fuzzy control according to claim 3, is characterized in that the electric current of the cooling electric magnet valve of cooling electric magnet valve current constant control mode is 1100mA.

5. the control method of the wet type DCT clutch temp control system based on fuzzy control according to claim 3, is characterized in that calculating clutch temp deviation delta T _cformula be Δ T _c=T _c-T _o, the T in formula _cfor clutch coupling oil-out throws away oil temperature, T _ofor temperature threshold.

6. the control method of the wet type DCT clutch temp control system based on fuzzy control according to claim 3, is characterized in that calculating clutch temp deviation variation rate d Δ T _cthe formula of/dt is

Δ T in formula _c(k-1) be clutch temp deviation, the Δ T gathering for the k-1 time _c(k) be that clutch temp deviation, the Δ t gathering for the k time is the sampling period of clutch temp deviation.

7. the control method of the wet type DCT clutch temp control system based on fuzzy control according to claim 3, is characterized in that the formula that calculates unit friction power P is

$P=|T_{q1}\&CenterDot;\frac{2\mathrm{\&pi;}}{60}(n_i-n_{c1})|+|T_{q2}\&CenterDot;\frac{2\mathrm{\&pi;}}{60}(n_i-n_{c2})|,$ T in formula _q1, T _q2for moment of torsion, the n that under the sliding state that rubs, clutch coupling 1,2 transmits _ifor transmission input shaft rotating speed, n _c1, n _c2for clutch coupling 1,2 clutch plate rotating speeds; Wherein, under the sliding state that rubs of calculating, the formula of clutch transmission torque is

Δ ω in formula _crspeed discrepancy, sign (Δ ω for transmission input shaft and clutch driven plate _cr) be sign function, $\mathrm{sign}\left({\mathrm{\&Delta;\&omega;}}_{\mathrm{cr}}\right)=\left\{\begin{array}{cc}1,& {\mathrm{\&Delta;\&omega;}}_{\mathrm{cr}}>0\\ -1,& {\mathrm{\&Delta;\&omega;}}_{\mathrm{cr}}\&le;0\end{array}\right.,$ μ _dfor kinetic friction coefficient, the S of friction of wet clutch is clutch plunger active area, P _nfor the applied pressure in the piston unit area of clutch coupling, Z are the secondary number of clutch friction, R ₀, R ₁be respectively friction disc external diameter, the internal diameter of clutch coupling.

8. the control method of the wet type DCT clutch temp control system based on fuzzy control according to claim 3, is characterized in that

Clutch temp deviation delta T _cfuzzy set be { VST, ST, RST, MT, RBT, BT, VBT}, clutch temp deviation variation rate d Δ T _cthe fuzzy set of/dt be NB, NM, NS, O, PS, PM, PB}, the fuzzy set of unit friction power P be VSP, SP, MP, RBP, BP, VBP}, the fuzzy set of cooling electric magnet valve electric current I be VSI, SI, MI, RBI, BI, VBI},

Clutch temp deviation delta T _cbasic domain be [0,70], domain is [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14], quantizing factor k ₁=14/70=0.2, clutch temp deviation variation rate d Δ T _cthe basic domain of/dt is [20,20], and domain is [6 ,-5 ,-4 ,-3 ,-2 ,-1,0,1,2,3,4,5,6], quantizing factor k ₂=6/20=0.3, the basic domain of unit friction power P is [0,20], domain is [0,1,2,3,4,5,6,7,8,9,10], quantizing factor k ₃=10/20=0.5, the basic domain of cooling electric magnet valve electric current I is [0,1200], domain is [0,1,2,3,4,5,6,7,8,9,10,11,12], scale factor k ₄=1200/12=100.

9. the control method of the wet type DCT clutch temp control system based on fuzzy control according to claim 3, is characterized in that the membership function of normal distribution is

10. the control method of the wet type DCT clutch temp control system based on fuzzy control according to claim 3, is characterized in that fuzzy control rule is as shown in the table,

, regular sentence connectives and wherein adopts cap, sentence connectives also to adopt cup.