CN103821919A - Dual clutch automatic transmission cooling flow control method and system - Google Patents
Dual clutch automatic transmission cooling flow control method and system Download PDFInfo
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- CN103821919A CN103821919A CN201410098269.8A CN201410098269A CN103821919A CN 103821919 A CN103821919 A CN 103821919A CN 201410098269 A CN201410098269 A CN 201410098269A CN 103821919 A CN103821919 A CN 103821919A
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- flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0434—Features relating to lubrication or cooling or heating relating to lubrication supply, e.g. pumps ; Pressure control
Abstract
The invention discloses a dual clutch automatic transmission cooling flow control method and a system. The dual clutch automatic transmission cooling flow control method comprises the following steps that work of slipping of a first clutch, work of slipping of a second clutch, a transmission gear, a speed and a accelerator pedal opening are obtained at every set sampling period; expected cooling flow of cooling oil flowing through the dual clutch is obtained based on work of slipping of the first clutch, work of slipping of the second clutch, the transmission gear, the speed and the accelerator pedal opening; flow valve is adjusted and differential flow between the flow of cooling oil of the dual clutch and the expected cooling flow is made in the set error range. According to the dual clutch automatic transmission cooling flow control method and the system, expected dual clutch cooling flow is codetermined by adopting work of slipping of the clutch, oil temperature of the dual clutch, oil temperature of the transmission and a shifting state, balanced relation between the cooling flow control and lubrication of the system is fully considered, so that moderate cooling flow can be appropriately provided to the dual clutch based on actual condition and adverse effects caused by excessive cooling and insufficient lubrication can be avoided.
Description
Technical field
The present invention relates to automatic gearbox of vehicles technical field, relate in particular to a kind of cool stream amount control method and system of dual-clutch transmission.
Background technique
Typical wet-type double-clutch automatic speed-change case is mainly made up of hardware such as oil pump, wet-type dual-clutch, electronic control system, hydraulic system and gears.Wet-type double-clutch automatic speed-change case comprises first clutch (also referred to as outer clutch), second clutch (also referred to as internal clutch), outer input shaft and interior input shaft, the outer input shaft control odd number shelves gear being wherein connected with first clutch, the interior input shaft control even number shelves gear and the reverse gear that are connected with second clutch, by the combination of electronic control system and the each gear of HYDRAULIC CONTROL SYSTEM with separate.When gear shift, clutch runs out of steam meshed gears, and another clutch makes the gear of pre-engagement obtain power simultaneously.Realize continuous transferring power by the alternation of first clutch and second clutch, have advantages of that gear shift is smooth-going, efficiency is high, travelling comfort is good.
Wet-type double-clutch automatic speed-change case the function of not carrying out cooling flow control for double clutch at present, can not consider the operating mode of car load actual motion.But, in the normal running process of car load, in the time that engine speed is stabilized in a certain rotating speed, the fuel-displaced total amount of oil pump is certain, the cooling oil of double clutch and the total amount of cooling oil of the gear of flowing through of flowing through is certain, in the time that the flow of the cooling oil of the double clutch of flowing through increases, the flow of cooling oil of gear of flowing through will reduce relatively, just carry out assignment of traffic if do not consider the operating mode of car load actual motion, just probably cause and distribute to that the cold oil liquid measure of double clutch is very few or to distribute to the cold oil liquid measure of gear very few, thereby cause the sliding wear degree of first clutch or second clutch driving disc and driven disc larger, or gear is lubricated insufficient, when affecting the working life of clutch and gear, reduce the Security that car load is driven.
Summary of the invention
The object of the invention is to overcome deficiency of the prior art, a kind of cool stream amount control method and system of dual-clutch transmission is provided.
For achieving the above object, technological scheme of the present invention is:
A cool stream amount control method for dual-clutch transmission, comprising:
Obtain the work of slipping of first clutch, work of slipping, gearbox-gear, the speed of a motor vehicle and the gas pedal aperture of second clutch every the sampling period of setting;
According to the work of slipping of the work of slipping of described first clutch, second clutch, gearbox-gear, the speed of a motor vehicle and gas pedal aperture, obtain the cooling flow of expectation of the cooling oil of the described double clutch of flowing through;
Adjust flux valve, and make the flow of cooling oil of described double clutch and the difference of the cooling flow of described expectation in the margin of error of setting.
Preferably, the cooling flow of expectation that obtains the cooling oil of the described double clutch of flowing through described in comprises:
According to the work of slipping of the work of slipping of described first clutch and second clutch, obtain the first cooling flow of the cooling oil of the described double clutch of flowing through;
According to described gearbox-gear, the speed of a motor vehicle and gas pedal aperture, obtain the second cooling flow of the cooling oil of the described double clutch of flowing through;
Determine the cooling flow of quasiexpectation, and to make the cooling flow of described quasiexpectation be the maximum value in described the first cooling flow and described the second cooling flow;
The cooling flow of described quasiexpectation is carried out to limit value processing, and flow through described in the being cooling flow of expectation of cooling oil of described double clutch of the cooling flow of definite limit value quasiexpectation after treatment.
Preferably, the second cooling flow that obtains the cooling oil of the described double clutch of flowing through described in comprises:
According to the described speed of a motor vehicle and gas pedal aperture, obtain the target gear of gearbox;
Judge whether described gearbox-gear equals described target gear;
If not, carry out gear-change operation, and determine that described the second cooling flow is 0;
If so,, according to all the second cooling flows of determining in the time period of setting before current sampling instant and the time dependent relation curve of flow of setting, determine described the second cooling flow.
Preferably, described according to all the second cooling flows of determining in the time period of setting before current sampling instant and the time dependent relation curve of flow of setting, determine that described the second cooling flow comprises:
According to the second all cooling flow in the time period of setting before current sampling instant, on described relation curve, find the first moment of the second cooling flow that the last sampling instant of corresponding current sampling instant determines;
Determined for the second moment, and make described the second moment equal the sampling period that described the first moment adds the above setting;
Determine that described the second cooling flow equals the flow in corresponding described the second moment on described relation curve.
Preferably, described relation curve is trapezoidal wave.
Preferably, described definite quasiexpectation cool stream measurer body comprises:
Obtain the temperature of cooling oil of the double clutch of flowing through and the temperature of the cooling oil of the gearbox gear of flowing through every the sampling period of described setting;
According to the temperature of the cooling oil of the temperature of the cooling oil of the described double clutch of flowing through and the gearbox gear of flowing through, obtain the 3rd cooling flow of the cooling oil of the described double clutch of flowing through;
Determine that the cooling flow of described quasiexpectation is the maximum value in described the first cooling flow, described the second cooling flow and described the 3rd cooling flow.
A cool stream amount control system for dual-clutch transmission, comprising:
Data acquisition unit, for obtaining the work of slipping of first clutch, work of slipping, gearbox-gear, the speed of a motor vehicle and the gas pedal aperture of second clutch every the sampling period of setting;
Expect cooling flow determining unit, for according to the work of slipping of the work of slipping of described first clutch, second clutch, gearbox-gear, the speed of a motor vehicle and gas pedal aperture, obtain the cooling flow of expectation of the cooling oil of the described double clutch of flowing through;
Regulon, for adjust flux valve, and makes the flow of cooling oil of described double clutch and the difference of the cooling flow of described expectation in the margin of error of setting.
Preferably, the cooling flow determining unit of described expectation comprises:
The first cooling flow determining unit, for according to the work of slipping of the work of slipping of described first clutch and second clutch, obtains the first cooling flow of the cooling oil of the described double clutch of flowing through;
The second cooling flow determining unit, for according to described gearbox-gear, the speed of a motor vehicle and gas pedal aperture, obtains the second cooling flow of the cooling oil of the described double clutch of flowing through;
The cooling flow determining unit of quasiexpectation, for determining the cooling flow of quasiexpectation, and to make the cooling flow of described quasiexpectation be the maximum value in described the first cooling flow and the second cooling flow;
Limit value processing unit, for the cooling flow of described quasiexpectation is carried out to limit value processing, and flow through described in the being cooling flow of expectation of cooling oil of described double clutch of the cooling flow of definite limit value quasiexpectation after treatment.
Preferably, described the second cooling flow determining unit comprises:
Target gear determining unit, for according to the described speed of a motor vehicle and gas pedal aperture, obtains the target gear of gearbox;
Gear shift judging unit, for judging whether described gearbox-gear equals described target gear;
The first determining unit, in described gearbox-gear and the unequal situation of described target gear, determines that described the second cooling flow is 0;
The second determining unit, for in the situation that described gearbox-gear equates with described target gear, carry out gear-change operation, and according to all the second cooling flows of determining in the time period of setting before current sampling instant and the time dependent relation curve of flow of setting, determine described the second cooling flow.
Preferably, described the second determining unit comprises:
The first moment determining unit for according to the second all cooling flow in the time period of setting before current sampling instant, finds the first moment of the second cooling flow that the last sampling instant of corresponding current sampling instant determines on described relation curve;
The second moment determining unit, for determining for the second moment, and makes described the second moment equal the sampling period that described the first moment adds the above setting;
The 3rd determining unit, for determining that described the second cooling flow equals the flow in corresponding described the second moment on described relation curve.
Preferably, described relation curve is trapezoidal wave.
Preferably, described data acquisition unit is also for the temperature of cooling oil and the temperature of cooling oil of the gearbox gear of flowing through of obtaining the double clutch of flowing through every the sampling period of described setting;
Described system also comprises the 3rd cooling flow determining unit, for the temperature of cooling oil of the double clutch of flowing through described in basis and the temperature of the cooling oil of the gearbox gear of flowing through, obtains the 3rd cooling flow of the cooling oil of the described double clutch of flowing through;
The cooling flow determining unit of described quasiexpectation specifically for: determine that the cooling flow of described quasiexpectation is the maximum value in described the first cooling flow, the second cooling flow and the 3rd cooling flow.
Beneficial effect of the present invention is, the cool stream amount control method of embodiment of the present invention dual-clutch transmission:
(1) utilize clutch work of slipping, double clutch oil temperature and TOT Transmission Oil Temperature and gearshift three aspects: jointly to determine the cooling flow of double clutch of expecting, the cooling flow control of system and lubricated equilibrium relation are considered all sidedly, be conducive to according to actual conditions, for double clutch provides appropriate cooling flow, supercooling and lubricated inadequate adverse effect are avoided rightly;
(2) be conducive to possess enough gear shift pressure in gearshift procedure, avoid the impact of the cooling flow control of clutch on gear shift pressure in gearshift procedure;
(3) extended double clutch working life, increased gearbox and car load drive safety.
Accompanying drawing explanation
Fig. 1 shows the flow chart of the cool stream amount control method of embodiment of the present invention dual-clutch transmission;
Fig. 2 shows the flow chart that obtains the flow of the cooling oil of the described double clutch of flowing through in the embodiment of the present invention;
Fig. 3 shows the flow chart of the second cooling flow of the cooling oil that obtains the described double clutch of flowing through in the embodiment of the present invention;
Fig. 4 shows the schematic diagram of relation curve in the embodiment of the present invention;
Fig. 5 shows the flow chart of determining described the second cooling flow in the embodiment of the present invention;
Fig. 6 shows the flow chart of determining the cooling flow of quasiexpectation in the embodiment of the present invention;
Fig. 7 shows the structural representation of the cool stream amount control system of embodiment of the present invention dual-clutch transmission;
Fig. 8 shows the structural representation of expecting cool stream amount determining unit in the embodiment of the present invention;
Fig. 9 shows the structural representation of the second cooling flow determining unit in the embodiment of the present invention;
Figure 10 shows the structural representation of the second determining unit in the embodiment of the present invention.
Embodiment
Describe embodiments of the invention below in detail, described embodiment's example is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Be exemplary below by the embodiment who is described with reference to the drawings, only for explaining the present invention, and can not be interpreted as limitation of the present invention.
The cool stream amount control method of embodiment of the present invention dual-clutch transmission, utilize clutch work of slipping, double clutch oil temperature and TOT Transmission Oil Temperature and gearshift three aspects: jointly to determine the cooling flow of double clutch of expecting, the cooling flow control of system and lubricated equilibrium relation are considered all sidedly, be conducive to according to actual conditions, for double clutch provides appropriate cooling flow, supercooling and lubricated inadequate adverse effect are avoided rightly.
As shown in Figure 1, be the flow chart of the cool stream amount control method of embodiment of the present invention dual-clutch transmission, the cool stream amount control method of described dual-clutch transmission, comprises the following steps:
Step 101: obtain the work of slipping of first clutch, work of slipping, gearbox-gear, the speed of a motor vehicle and the gas pedal aperture of second clutch every the sampling period of setting.
Particularly, first, the formula of the work of slipping of clutch is known by those skilled in the art, belongs to prior art, repeats no more in this article.In addition, gearbox-gear can directly read from gearbox control, and the speed of a motor vehicle can read from entire car controller, and gas pedal aperture can obtain by the position transducer that is arranged on gas pedal place.
Step 102: according to the work of slipping of the work of slipping of described first clutch, second clutch, gearbox-gear, the speed of a motor vehicle and gas pedal aperture, obtain the cooling flow of expectation of the cooling oil of the described double clutch of flowing through.
Particularly, five parameters such as the work of slipping of the first clutch that above-mentioned basis gets, obtain the method for the cooling flow of expectation of the cooling oil of the double clutch of flowing through, and will at length set forth in conjunction with Fig. 2 hereinafter.
Step 103: adjust flux valve, and make the flow of cooling oil of described double clutch and the difference of the cooling flow of described expectation in the margin of error of setting.
Particularly, after the cooling flow of expectation of cooling oil that gets the double clutch of flowing through, system can regulate the Flow valve of the cooling oil flow for controlling the double clutch of flowing through, progressively the flow of the cooling oil of the double clutch of flowing through (can read by flowmeter) is adjusted to the cooling flow of described expectation, concrete regulating method can regulate by adoption rate, integral adjustment, differential regulates, PID regulating method etc., above-mentioned regulating method is the conventional controlling methods that adopt of those skilled in the art, repeat no more in this article, the parameter relating in controlling method can be adjusted according to concrete requirement.In addition, those skilled in the art can set corresponding margin of error according to concrete requirement.
As shown in Figure 2, be the flow chart that obtains the flow of the cooling oil of the described double clutch of flowing through in the embodiment of the present invention, described in obtain the cooling flow of expectation of the cooling oil of the described double clutch of flowing through, comprise the following steps:
Step 201: according to the work of slipping of the work of slipping of described first clutch and second clutch, obtain the first cooling flow of the cooling oil of the described double clutch of flowing through.
Particularly, the first cooling flow is preferably by the acquisition of tabling look-up, wherein comprise the bivariate table of the work of slipping of first clutch and the work of slipping of second clutch and the first cooling flow corresponding relation, known by those skilled in the art, can test and demarcate by limited number of time, repeat no more in this article.
Step 202: according to described gearbox-gear, the speed of a motor vehicle and gas pedal aperture, obtain the second cooling flow of the cooling oil of the described double clutch of flowing through.
Particularly, above-mentioned according to gearbox-gear, the speed of a motor vehicle and gas pedal aperture, obtain the method for the second cooling flow of the cooling oil of the described double clutch of flowing through, will at length set forth in conjunction with Fig. 3 to Fig. 5 hereinafter.
Step 203: determine the cooling flow of quasiexpectation, and to make the cooling flow of described quasiexpectation be the maximum value in described the first cooling flow and the second cooling flow.
Step 204: the cooling flow of described quasiexpectation is carried out to limit value processing, and flow through described in the being cooling flow of expectation of cooling oil of described double clutch of the cooling flow of definite limit value quasiexpectation after treatment.
Particularly, first, the method for quasiexpectation cool stream amount being carried out to limit value processing comprises:
Judge whether the cooling flow of described quasiexpectation is more than or equal to the cooling flux lower limit of setting and is less than or equal to the cooling flow upper limit of setting, if so, determine that the cooling flow of described quasiexpectation is the cooling flow of described limit value quasiexpectation after treatment;
And, in the time that the cooling flow of described quasiexpectation is greater than the cooling flow upper limit of setting, determine that the cooling flow of limit value quasiexpectation after treatment is the cooling flow upper limit;
In the time that the cooling flow of quasiexpectation is less than the cooling flux lower limit of setting, determine that the cooling flow of limit value quasiexpectation after treatment is cooling flux lower limit.Especially, the described cooling flow upper limit is preferably 23L/min, and described cooling flux lower limit is preferably 0L/min.
At the cooling flow of definite limit value quasiexpectation after treatment, the cooling flow of expectation of the cooling oil of the described double clutch of flowing through described in by the cooling flow of limit value quasiexpectation after treatment being.
In the present embodiment, get maximum value among the first cooling flow and the second cooling flow as the cooling flow of quasiexpectation, can fully guarantee like this sliding wear degree of driving disc and the driven disc of first clutch or second clutch, also consider the operating mode of car load actual motion simultaneously.
As shown in Figure 3, be the flow chart that obtains the second cooling flow of the cooling oil of the described double clutch of flowing through in the embodiment of the present invention, described in obtain the cooling oil of the described double clutch of flowing through the second cooling flow comprise the following steps:
Step 301: according to the described speed of a motor vehicle and gas pedal aperture, obtain the target gear of gearbox.
Particularly, the target gear of gearbox, preferably by the acquisition of tabling look-up, wherein comprises the bivariate table of the target gear corresponding relation of the speed of a motor vehicle and gas pedal aperture and gearbox, is known by those skilled in the art, can test and demarcate by limited number of time, repeat no more in this article.
Step 302: judge whether described gearbox-gear equals described target gear.
Particularly, judge whether double clutch gearbox needs gear shift will consider the state of two clutches, is responsible for transmitting torque if current by first clutch, the gear that the gear of determining first clutch is double clutch gearbox, i.e. described gearbox-gear; In like manner, be responsible for transmitting torque if current by second clutch, the gear that the gear of determining second clutch is double clutch gearbox, i.e. described gearbox-gear.
Step 303: if described gearbox-gear and described target gear are unequal, carry out gear-change operation, and determine that described the second cooling flow is 0.
Particularly, when described gearbox-gear and described target gear are when unequal, when current double clutch gearbox needs gear shift, carry out gear-change operation, make gearbox-gear switch to target gear, described the second cooling flow is set to 0 simultaneously.Due to needs gear shift, consider that the driving disc of first clutch or second clutch and the sliding wear degree of driven disc increase, so now system is considered sliding wear degree completely, cooling oil is delivered to the cooling branch road of double clutch in large quantities, the heat that effectively reduces sliding wear degree and produced by sliding wear, has extended working life of double clutch; Meanwhile, be conducive to possess enough gear shift pressure in gearshift procedure, avoid the impact of the cooling flow control of clutch on gear shift pressure in gearshift procedure.
Step 304: if described gearbox-gear equates with described target gear,, according to all the second cooling flows of determining in the time period of setting before current sampling instant and the time dependent relation curve of flow of setting, determine described the second cooling flow.
Particularly, in the time that gearbox-gear equates with described target gear, system can suitably reduce the flow of the cooling oil of the cooling branch road of double clutch, thereby can suitably increase the flow of the cooling oil of the gearbox gear of flowing through, thereby guaranteeing, on the basis of clutch sliding wear degree, to guarantee the lubrication effect of gearbox gear.In addition, determine the method for described the second cooling flow, will at length set forth in conjunction with Fig. 4 and Fig. 5 hereinafter.
As shown in Figure 4, be the schematic diagram of relation curve in the embodiment of the present invention, this relation curve passes through long time test by inventor and obtains, and object is to obtain the cooling flow of suitable expectation, to meet system requirements.Particularly, described relation curve is one group of trapezoidal wave, and abscissa represents, y coordinate represents flow, the t moment is 0L/min for the minimum value of flow, rise time from minimum value to maximum value 4L/min is 1.5s, then maintains maximum value 1s, then drops to 0L/min from maximum value 4L/min, be 1.5s fall time, minimum value maintains 1s, and then carry out above-mentioned from minimum value to peaked rising, by that analogy.
As shown in Figure 5, it is the flow chart of determining described the second cooling flow in the embodiment of the present invention, described according to all the second cooling flows of determining in the time period of setting before current sampling instant and the time dependent relation curve of flow of setting, determine that described the second cooling flow comprises the following steps:
Step 401: according to the second all cooling flow in the time period of setting before current sampling instant, find the first moment of the second cooling flow that the last sampling instant of corresponding current sampling instant determines on described relation curve.Especially, the time period of described setting should be greater than relation curve and maintain the time of same value.
Step 402: determined for the second moment, and make described the second moment equal the sampling period that described the first moment adds the above setting;
Step 403: determine that described the second cooling flow equals the flow in corresponding described the second moment on described relation curve.
Illustrate definite process of the second cooling flow below, for example setting the described time period is 1.5s, the setting sampling period is 0.5s, if interior all the second cooling flows determined of 1.5s are 0 before obtaining current sampling instant, from the relation curve shown in Fig. 4, can find out, the t moment in a upper sampling instant corresponding relation curve of current sampling instant, thereby can infer the t+0.5 moment in current sampling instant corresponding relation curve, and then can to obtain the flow in corresponding t+0.5 moment in relation curve according to the correlation computations formula of similar triangles be 4/3L/min, the second cooling flow of determining current sampling instant is 4/3L/min.
In another embodiment of the present invention, in the process of the cooling flow of calculation expectation, not only consider the impact of clutch work of slipping and gearshift, also consider the impact of double clutch temperature and temp. of gear-shifting box, thereby made the cooling flow of expectation getting more meet the actual conditions of car load operation.
As shown in Figure 6, be the flow chart of determining the cooling flow of quasiexpectation in another preferred embodiment of the present invention, the method for the cooling flow of described definite quasiexpectation specifically comprises and step:
Step 501: obtain the temperature of cooling oil of the double clutch of flowing through and the temperature of the cooling oil of the gearbox gear of flowing through every the sampling period of described setting.
At length, for obtaining the temperature of cooling oil of the double clutch of flowing through, temperature transducer is arranged on the external casing that double clutch lower-left side margin (from gearbox toward motor axial direction) is corresponding, the outside one week uniform small pores that distributed of double clutch, when rotation in work,, the flow through cooling oil of double clutch can sputter on temperature transducer, temperature transducer collects the temperature of the cooling oil of the double clutch of flowing through thus, also referred to as double clutch temperature; In like manner, for obtaining the temperature of cooling oil of the gearbox gear of flowing through, temperature transducer is arranged on the main casing inwall of gear box oil housing bottom (from gearbox toward motor axial direction, oil sump is positioned at gearbox left side), this temperature transducer is immersed in fluid always, temperature transducer can collect the temperature of the cooling oil of the gearbox gear of flowing through thus, also referred to as temp. of gear-shifting box.
Step 502: according to the temperature of the cooling oil of the temperature of the cooling oil of the described double clutch of flowing through and the gearbox gear of flowing through, obtain the 3rd cooling flow of the cooling oil of the described double clutch of flowing through.
Particularly, first the temperature of cooling oil of double clutch of flowing through described in calculating and the temperature difference of the cooling oil temperature of the gearbox gear of flowing through, then preferably obtain the 3rd cooling flow by tabling look-up, wherein comprise the one dimension table of described temperature difference and the 3rd cooling flow corresponding relation, known by those skilled in the art, can test and demarcate by limited number of time, repeat no more in this article.
Step 503: determine that the cooling flow of described quasiexpectation is the maximum value in described the first cooling flow, the second cooling flow and the 3rd cooling flow.
In the present embodiment, get maximum value among the first cooling flow, the second cooling flow and the 3rd cooling flow as the cooling flow of quasiexpectation, can fully guarantee like this sliding wear degree of driving disc and the driven disc of first clutch or second clutch, also the operating mode of considering car load actual motion, specifically comprises gearshift and double clutch temperature and temp. of gear-shifting box simultaneously.
To sum up, the cool stream amount control method of embodiment of the present invention wet-type double-clutch automatic speed-change case, utilize clutch work of slipping, double clutch oil temperature and TOT Transmission Oil Temperature, gearshift three aspects: jointly to determine the cooling flow of double clutch of expecting, the cooling flow control of system and lubricated equilibrium relation are considered all sidedly, be conducive to according to actual conditions, just right for double clutch provides appropriate cooling flow, avoid supercooling and lubricated inadequate adverse effect.
Particularly, the cooling flow of double clutch need to regulate according to actual conditions, under the operating mode such as starting, long-time upward slope under heavy load, double clutch is often in sliding wear working state, can produce a large amount of heats, now need to strengthen cooling flow, protection double clutch; And under the operating mode of suburb, gear shift frequency is low, it is low that double clutch produces heat, now can suitably reduce the cooling flow for double clutch.Therefore, according to actual conditions, the cooling flow of double clutch is controlled, be conducive to extend clutch and gearbox working life.
In addition, the cool stream amount control method of wet-type double-clutch automatic speed-change case of the present invention, determine the cooling flow of clutch by gear detected state, be conducive to possess enough gear shift pressure in gearshift procedure, avoid the impact of the cooling flow control of clutch on gear shift pressure in gearshift procedure.
Have again, the cool stream amount control method of wet-type double-clutch automatic speed-change case of the present invention, extended double clutch working life, increased gearbox and car load drive safety.
Correspondingly, the embodiment of the present invention also provides a kind of cool stream amount control system of dual-clutch transmission, as shown in Figure 7, is the structural representation of this system.
In this embodiment, the cool stream amount control system of described dual-clutch transmission comprises:
Expect cooling flow determining unit 602, for according to the work of slipping of the work of slipping of described first clutch, second clutch, gearbox-gear, the speed of a motor vehicle and gas pedal aperture, obtain the cooling flow of expectation of the cooling oil of the described double clutch of flowing through;
As shown in Figure 8, be the structural representation of expecting cool stream amount determining unit 602 in the embodiment of the present invention.The cooling flow determining unit 602 of described expectation comprises:
The first cooling flow determining unit 701, for according to the work of slipping of the work of slipping of described first clutch and second clutch, obtains the first cooling flow of the cooling oil of the described double clutch of flowing through;
The second cooling flow determining unit 702, for according to described gearbox-gear, the speed of a motor vehicle and gas pedal aperture, obtains the second cooling flow of the cooling oil of the described double clutch of flowing through;
The cooling flow determining unit 703 of quasiexpectation, for determining the cooling flow of quasiexpectation, and to make the cooling flow of described quasiexpectation be the maximum value in described the first cooling flow and the second cooling flow;
Limit value processing unit 704, for the cooling flow of described quasiexpectation is carried out to limit value processing, and flow through described in the being cooling flow of expectation of cooling oil of described double clutch of the cooling flow of definite limit value quasiexpectation after treatment.
As shown in Figure 9, be the structural representation of the second cooling flow determining unit 702 in the embodiment of the present invention, described the second cooling flow determining unit 702 comprises:
Target gear determining unit 801, for according to the described speed of a motor vehicle and gas pedal aperture, obtains the target gear of gearbox;
Gear shift judging unit 802, for judging whether described gearbox-gear equals described target gear;
The first determining unit 803, in described gearbox-gear and the unequal situation of described target gear, determines that described the second cooling flow is 0;
The second determining unit 804, for in the situation that described gearbox-gear equates with described target gear, carry out gear-change operation, and according to all the second cooling flows of determining in the time period of setting before current sampling instant and the time dependent relation curve of flow of setting, determine described the second cooling flow.
As shown in figure 10, be the structural representation of the second determining unit 804 in the embodiment of the present invention, described the second determining unit 804 comprises:
The first moment determining unit 901 for according to the second all cooling flow in the time period of setting before current sampling instant, finds the first moment of the second cooling flow that the last sampling instant of corresponding current sampling instant determines on described relation curve;
The second moment determining unit 902, for determining for the second moment, and makes described the second moment equal the sampling period that described the first moment adds the above setting;
The 3rd determining unit 903, for determining that described the second cooling flow equals the flow in corresponding described the second moment on described relation curve.
Preferably, described relation curve is trapezoidal wave.
In another preferred embodiment of the present invention, described data acquisition unit 601 is also for the temperature of cooling oil and the temperature of cooling oil of the gearbox gear of flowing through of obtaining the double clutch of flowing through every the sampling period of described setting.
Described system also comprises the 3rd cooling flow determining unit, for the temperature of cooling oil of the double clutch of flowing through described in basis and the temperature of the cooling oil of the gearbox gear of flowing through, obtains the 3rd cooling flow of the cooling oil of the described double clutch of flowing through.
The cooling flow determining unit 703 of described quasiexpectation specifically for: determine that the cooling flow of described quasiexpectation is the maximum value in described the first cooling flow, the second cooling flow and the 3rd cooling flow.
The concrete processing procedure of above-mentioned each unit can, with reference to the description in the method for the embodiment of the present invention above, not repeat them here.
It should be noted that, system embodiment described above is only schematic, the wherein said unit as separating component explanation can or can not be also physically to separate, the parts that show as unit can be or can not be also physical locations, can be positioned at a place, or also can be distributed on multiple NEs.Can select according to the actual needs some or all of module wherein to realize the object of the present embodiment scheme.Those of ordinary skills, in the situation that not paying creative work, are appreciated that and implement.
Describe structure of the present invention, feature and action effect in detail according to the embodiment shown in graphic above; the foregoing 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 specification and illustrating contain spiritual, all should be in protection scope of the present invention.
Claims (12)
1. a cool stream amount control method for dual-clutch transmission, is characterized in that, comprising:
Obtain the work of slipping of first clutch, work of slipping, gearbox-gear, the speed of a motor vehicle and the gas pedal aperture of second clutch every the sampling period of setting;
According to the work of slipping of the work of slipping of described first clutch, second clutch, gearbox-gear, the speed of a motor vehicle and gas pedal aperture, obtain the cooling flow of expectation of the cooling oil of the described double clutch of flowing through;
Adjust flux valve, and make the flow of cooling oil of described double clutch and the difference of the cooling flow of described expectation in the margin of error of setting.
2. cool stream amount control method according to claim 1, is characterized in that, described in obtain the cooling oil of the described double clutch of flowing through the cooling flow of expectation comprise:
According to the work of slipping of the work of slipping of described first clutch and second clutch, obtain the first cooling flow of the cooling oil of the described double clutch of flowing through;
According to described gearbox-gear, the speed of a motor vehicle and gas pedal aperture, obtain the second cooling flow of the cooling oil of the described double clutch of flowing through;
Determine the cooling flow of quasiexpectation, and to make the cooling flow of described quasiexpectation be the maximum value in described the first cooling flow and described the second cooling flow;
The cooling flow of described quasiexpectation is carried out to limit value processing, and flow through described in the being cooling flow of expectation of cooling oil of described double clutch of the cooling flow of definite limit value quasiexpectation after treatment.
3. cool stream amount control method according to claim 2, is characterized in that, described in obtain the cooling oil of the described double clutch of flowing through the second cooling flow comprise:
According to the described speed of a motor vehicle and gas pedal aperture, obtain the target gear of gearbox;
Judge whether described gearbox-gear equals described target gear;
If not, carry out gear-change operation, and determine that described the second cooling flow is 0;
If so,, according to all the second cooling flows of determining in the time period of setting before current sampling instant and the time dependent relation curve of flow of setting, determine described the second cooling flow.
4. cool stream amount control method according to claim 3, it is characterized in that, described according to all the second cooling flows of determining in the time period of setting before current sampling instant and the time dependent relation curve of flow of setting, determine that described the second cooling flow comprises:
According to the second all cooling flow in the time period of setting before current sampling instant, on described relation curve, find the first moment of the second cooling flow that the last sampling instant of corresponding current sampling instant determines;
Determined for the second moment, and make described the second moment equal the sampling period that described the first moment adds the above setting;
Determine that described the second cooling flow equals the flow in corresponding described the second moment on described relation curve.
5. cool stream amount control method according to claim 4, is characterized in that, described relation curve is trapezoidal wave.
6. according to the cool stream amount control method described in claim 2 to 5 any one, it is characterized in that, described definite quasiexpectation cool stream measurer body comprises:
Obtain the temperature of cooling oil of the double clutch of flowing through and the temperature of the cooling oil of the gearbox gear of flowing through every the sampling period of described setting;
According to the temperature of the cooling oil of the temperature of the cooling oil of the described double clutch of flowing through and the gearbox gear of flowing through, obtain the 3rd cooling flow of the cooling oil of the described double clutch of flowing through;
Determine that the cooling flow of described quasiexpectation is the maximum value in described the first cooling flow, described the second cooling flow and described the 3rd cooling flow.
7. a cool stream amount control system for dual-clutch transmission, is characterized in that, comprising:
Data acquisition unit, for obtaining the work of slipping of first clutch, work of slipping, gearbox-gear, the speed of a motor vehicle and the gas pedal aperture of second clutch every the sampling period of setting;
Expect cooling flow determining unit, for according to the work of slipping of the work of slipping of described first clutch, second clutch, gearbox-gear, the speed of a motor vehicle and gas pedal aperture, obtain the cooling flow of expectation of the cooling oil of the described double clutch of flowing through;
Regulon, for adjust flux valve, and makes the flow of cooling oil of described double clutch and the difference of the cooling flow of described expectation in the margin of error of setting.
8. cool stream amount control system according to claim 7, is characterized in that, the cooling flow determining unit of described expectation comprises:
The first cooling flow determining unit, for according to the work of slipping of the work of slipping of described first clutch and second clutch, obtains the first cooling flow of the cooling oil of the described double clutch of flowing through;
The second cooling flow determining unit, for according to described gearbox-gear, the speed of a motor vehicle and gas pedal aperture, obtains the second cooling flow of the cooling oil of the described double clutch of flowing through;
The cooling flow determining unit of quasiexpectation, for determining the cooling flow of quasiexpectation, and to make the cooling flow of described quasiexpectation be the maximum value in described the first cooling flow and the second cooling flow;
Limit value processing unit, for the cooling flow of described quasiexpectation is carried out to limit value processing, and flow through described in the being cooling flow of expectation of cooling oil of described double clutch of the cooling flow of definite limit value quasiexpectation after treatment.
9. cool stream amount control system according to claim 8, is characterized in that, described the second cooling flow determining unit comprises:
Target gear determining unit, for according to the described speed of a motor vehicle and gas pedal aperture, obtains the target gear of gearbox;
Gear shift judging unit, for judging whether described gearbox-gear equals described target gear;
The first determining unit, in described gearbox-gear and the unequal situation of described target gear, determines that described the second cooling flow is 0;
The second determining unit, for in the situation that described gearbox-gear equates with described target gear, carry out gear-change operation, and according to all the second cooling flows of determining in the time period of setting before current sampling instant and the time dependent relation curve of flow of setting, determine described the second cooling flow.
10. cool stream amount control system according to claim 9, is characterized in that, described the second determining unit comprises:
The first moment determining unit for according to the second all cooling flow in the time period of setting before current sampling instant, finds the first moment of the second cooling flow that the last sampling instant of corresponding current sampling instant determines on described relation curve;
The second moment determining unit, for determining for the second moment, and makes described the second moment equal the sampling period that described the first moment adds the above setting;
The 3rd determining unit, for determining that described the second cooling flow equals the flow in corresponding described the second moment on described relation curve.
11. cool stream amount control systems according to claim 10, is characterized in that, described relation curve is trapezoidal wave.
Cool stream amount control system described in 12. according to Claim 8 to 11 any one, is characterized in that,
Described data acquisition unit is also for the temperature of cooling oil and the temperature of cooling oil of the gearbox gear of flowing through of obtaining the double clutch of flowing through every the sampling period of described setting;
Described system also comprises the 3rd cooling flow determining unit, for the temperature of cooling oil of the double clutch of flowing through described in basis and the temperature of the cooling oil of the gearbox gear of flowing through, obtains the 3rd cooling flow of the cooling oil of the described double clutch of flowing through;
The cooling flow determining unit of described quasiexpectation specifically for: determine that the cooling flow of described quasiexpectation is the maximum value in described the first cooling flow, the second cooling flow and the 3rd cooling flow.
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