CN106907477A - Slide the control method of synchronizer pre-engagement, device and TCU under downshift operating mode - Google Patents
Slide the control method of synchronizer pre-engagement, device and TCU under downshift operating mode Download PDFInfo
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- CN106907477A CN106907477A CN201510979484.3A CN201510979484A CN106907477A CN 106907477 A CN106907477 A CN 106907477A CN 201510979484 A CN201510979484 A CN 201510979484A CN 106907477 A CN106907477 A CN 106907477A
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- axle
- speed
- rotating speed
- power transmission
- powered
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Classifications
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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
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/06—Control by electric or electronic means, e.g. of fluid pressure
- F16D48/10—Preventing unintentional or unsafe engagement
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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
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/02—Selector apparatus
- F16H59/0208—Selector apparatus with means for suppression of vibrations or reduction of noise
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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
- F16H2306/00—Shifting
- F16H2306/40—Shifting activities
- F16H2306/48—Synchronising of new gear
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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
- F16H2306/00—Shifting
- F16H2306/40—Shifting activities
- F16H2306/54—Synchronizing engine speed to transmission input speed
Abstract
It is a kind of slide downshift operating mode under synchronizer pre-engagement control method,Device and TCU,When the speed discrepancy of the axle that methods described is transmitted by the axle transmitted in power with non-powered is more than or equal to first threshold,The corresponding set amount of clutch separation first of axle that power is transmitted,The corresponding clutch of axle of non-powered transmission combines the second set amount,Ask engine that tachometer value is risen into the first rotating speed simultaneously to adjust the rotating speed of the axle of non-powered transmission,The wherein value of the first set amount and the second set amount is negatively correlated with the relative speed variation of the axle of power transmission,When the speed discrepancy after adjustment is less than Second Threshold,Request engine stop lifting rotating speed,The axle correspondence clutch of power transmission combines first set amount,And reduce the control pressure of the axle correspondence clutch that non-powered is transmitted until opening completely,When the control pressure of the axle correspondence clutch of non-powered transmission is less than three threshold values, synchronizer enters shelves,So as to avoid producing into a grade noise,Reduce DCT oil consumption.
Description
Technical field
The present invention relates to automotive field, more particularly to a kind of control for sliding synchronizer pre-engagement under downshift operating mode
Method processed, device and TCU.
Background technology
DCT (Dual Clutch Transmission, double-clutch speed changer) is a kind of automatic transmission, due to
It has shift process power uninterrupted, the low advantage of oil consumption, automatic as a kind of current popular automobile
Speed changer.
Similar with manual transmission, DCT also has synchronizer and shifting fork mechanism, and synchronizer can make to nibble
The gear of conjunction reaches consistent rotating speed and smoothly engages gearshift, shortens shift time.But in synchronizer two
When end speed discrepancy is larger, particularly in the case where downshift operating mode is slided, it is difficult to control through being commonly present the synchronization stage
The problem of system, so as to bring into a grade noise.If vertical once terminating in downshift operating mode clutch interactive controlling
Carry out pre-engagement, it may appear that have synchronizer in place when vehicle stabilization is travelled on odd even number axis simultaneously, so that
Cause DCT oil consumption higher.
The content of the invention
Present invention solves the technical problem that being to reduce to slide the possibility that synchronization in shifting down device enters shelves generation noise
Property, while reducing DCT oil consumption.
To solve the above problems, the present invention provide it is a kind of slide downshift operating mode under synchronizer pre-engagement control
Method, methods described includes：
When speed reaches downshift operating mode pre-engagement speed, the synchronizer pre-engagement sent into grade gear is controlled
Instruction；
Judge whether the axle of power transmission is more than or equal to the first threshold with the speed discrepancy of the axle of non-powered transmission
Value；
When the axle of power transmission is more than or equal to first threshold with the speed discrepancy of the axle of non-powered transmission
During value, the corresponding set amount of clutch separation first of axle of power transmission, the axle of non-powered transmission is corresponding
Clutch combines the second set amount, and engine speed is risen to the first rotating speed to adjust by request engine
The rotating speed of the axle of non-powered transmission；The value of wherein described first set amount and second set amount with it is described
The relative speed variation of the axle of power transmission is negatively correlated；
The axle of power transmission after adjustment is less than Second Threshold with the speed discrepancy of the axle of non-powered transmission
When, request engine stop lifting rotating speed, the corresponding clutch of axle of power transmission sets with reference to described first
It is quantitative, and reduce the control pressure of the axle correspondence clutch that non-powered is transmitted until opening completely；
When the control pressure of the axle correspondence clutch of non-powered transmission is less than three threshold values, synchronizer enters
Shelves.
Alternatively, first rotating speed is more than rotating speed of target.
Alternatively, the rotating speed of target exports rotating speed, enters grade gear gearratio and enters shelves shelves according to DCT
Position base ratio is calculated and obtained.
Alternatively, it is described slide downshift operating mode under synchronizer pre-engagement control method, also include：
When the axle of power transmission is more than or equal to first threshold with the speed discrepancy of the axle of non-powered transmission, open
Beginning timing；
When the time that timing is obtained threshold time is exceeded, request engine stop lifting rotating speed, power is passed
The corresponding clutch of axle passed combine first set amount, and reduce non-powered transmission axle it is corresponding from
The control pressure of clutch until open completely.
Alternatively, it is described slide downshift operating mode under synchronizer pre-engagement control method, also include：
When the rotating speed rate of change of power transmission is more than or equal to relative speed variation threshold value, engine is asked
Stop lifting rotating speed, the corresponding clutch of axle of power transmission combines first set amount, and reduces non-
The corresponding clutch control pressure of axle of power transmission until open completely.
Alternatively, it is described slide downshift operating mode under synchronizer pre-engagement control method, also include：
When axle and the non-powered transmission of power transmission axle speed discrepancy more than or equal to the first threshold and
When the relative speed variation of the axle of power transmission is less than or equal to relative speed variation threshold value, the axle pair of power transmission
The set amount of clutch separation first answered, the corresponding clutch of axle of non-powered transmission combines the second set amount,
And engine speed is risen to the first rotating speed to adjust the rotating speed of the axle of non-powered transmission by request engine.
The embodiment of the present invention also provide it is a kind of slide downshift operating mode under synchronizer pre-engagement control device, institute
Stating device includes：
Instruction issue unit, is suitable to, when speed reaches downshift operating mode pre-engagement speed, send into a grade gear
Synchronizer pre-engagement control instruction；
First judging unit, is suitable in the premise for having the synchronizer pre-engagement control instruction into grade gear to send
Under, judge whether the axle of power transmission is more than or equal to first threshold with the speed discrepancy of the axle of non-powered transmission；
First control unit, is suitable to when the axle of power transmission is big with the speed discrepancy of the axle that non-powered is transmitted
When the first threshold, the corresponding set amount of clutch separation first of axle of power transmission is non-
The corresponding clutch of axle of power transmission combines the second set amount, and asks engine by engine speed
The first rotating speed is risen to adjust the rotating speed of the axle of non-powered transmission；Wherein described first set amount and described
The relative speed variation of the axle that the value of two set amounts is transmitted with the power is negatively correlated；
Second control unit, is suitable to the axle of power transmission after adjustment and the axle of non-powered transmission
Speed discrepancy be less than Second Threshold when, request engine stop lifting rotating speed, power transmission axle it is corresponding from
Clutch is straight with reference to first set amount, and the control pressure of the axle correspondence clutch of reduction non-powered transmission
To opening completely；
3rd control unit, is suitable to be less than when the control pressure of the axle correspondence clutch of non-powered transmission
Synchronizer enters shelves during three threshold values.
Alternatively, first rotating speed is more than rotating speed of target.
Alternatively, the rotating speed of target exports rotating speed, enters grade gear gearratio and enters shelves shelves according to DCT
Position base ratio is calculated and obtained.
Alternatively, second control unit is further adapted for：
When the axle of power transmission is more than or equal to first threshold with the speed discrepancy of the axle of non-powered transmission, start
Timing；When the time that timing is obtained threshold time is exceeded, request engine stop lifting rotating speed, power
The corresponding clutch of axle of transmission is corresponding with reference to first set amount, and the axle of reduction non-powered transmission
The control pressure of clutch until open completely.
Alternatively, second control unit is further adapted for：
When the rotating speed rate of change of power transmission is more than or equal to relative speed variation threshold value, engine is asked
Stop lifting rotating speed, the corresponding clutch of axle of power transmission combines first set amount, and reduces non-
The corresponding clutch control pressure of axle of power transmission until open completely.
Alternatively, first control unit is further adapted for：
When axle and the non-powered transmission of power transmission axle speed discrepancy more than or equal to the first threshold and
When the relative speed variation of the axle of power transmission is less than or equal to relative speed variation threshold value, the axle pair of power transmission
The set amount of clutch separation first answered, the corresponding clutch of axle of non-powered transmission combines the second set amount,
And engine speed is risen to the first rotating speed to adjust the rotating speed of the axle of non-powered transmission by request engine.
The embodiment of the present invention also provides a kind of TCU, including it is above-mentioned slide downshift operating mode under synchronizer nibble in advance
The control device of conjunction.
Compared with prior art, the technical scheme of the embodiment of the present invention has the advantages that：
The rotating speed of the axle that the technical scheme of the embodiment of the present invention is transmitted by the axle transmitted in power with non-powered
When difference is more than or equal to first threshold, the corresponding set amount of clutch separation first of axle that power is transmitted,
The corresponding clutch of axle of non-powered transmission combines the second set amount, while asking engine by tachometer value liter
To the first rotating speed with adjust non-powered transmission axle rotating speed, wherein first set amount and described second
The value of set amount is negatively correlated with the relative speed variation of the axle of power transmission, and speed discrepancy after adjustment is less than the
During two threshold values, request engine stop lifting rotating speed, the axle correspondence clutch of power transmission combines described the
One set amount, and reduce the control pressure of the axle correspondence clutch of non-powered transmission until opening completely, when
Synchronizer enters shelves when the control pressure of the axle correspondence clutch of the non-powered transmission is less than three threshold values, from
And the rotating speed at synchronizer two ends is essentially identical when causing that synchronizer enters grade, enters shelves control and be more prone to, and then
Be not likely to produce into a grade noise, at the same time, due to only downshift point nearby when, just send pre-engagement and instruct,
Synchronizer in non-powered transmission axle can just be engaged, so that DCT oil consumption is relatively low.
Further, first set amount and non-powered of the corresponding clutch separation of axle transmitted due to power
The second set amount that the corresponding clutch of the axle of transmission is combined, the rotating speed rate of change based on power transmission and
Setting, when the rotating speed rate of change of power transmission is smaller, first set amount and second set amount
Value it is bigger, so as to the synchronization control effect for avoiding vehicle deceleration different band from is different.
Brief description of the drawings
Fig. 1 is existing a kind of 4 grades and is down to 3 grades of process schematics of stabilization laggard 2 gear of traveling；
Fig. 2 is the control method that a kind of in the embodiment of the present invention slides synchronizer pre-engagement under downshift operating mode
Flow chart；
Fig. 3 is a kind of 4 grades in the embodiment of the present invention and is down to 3 grades of processes of stabilization laggard 2 gear of traveling
Schematic diagram；
Fig. 4 is a kind of DCT structure principle charts in the embodiment of the present invention；
Fig. 5 is a kind of structural representation of the TCU in the embodiment of the present invention.
Specific embodiment
At present, the synchronizer of DCT vehicles can make will meshed gears reach consistent rotating speed and smooth
Engagement gearshift.But when at synchronizer two ends, speed discrepancy is larger, particularly in the case where downshift operating mode is slided, warp
Synchronization stage unmanageable problem is commonly present, so as to bring into a grade noise.If in downshift operating mode
Clutch interactive controlling is once terminating to carry out pre-engagement immediately, it may appear that odd even number axis when vehicle stabilization is travelled
It is upper to have synchronizer in place simultaneously, so as to cause DCT oil consumption higher.
To cause that those skilled in the art more fully understands above mentioned problem, Fig. 1 shows in the prior art 4
Shelves are down to 2 grades of downshift process schematic.
Fig. 1 (a) is throttle signal change curve；Fig. 1 (b) is DCT rotation speed change curve maps, wherein in fact
Line represents engine speed, and solid dotted line represents the rotating speed of DCT power transmission, and dotted line represents DCT
The rotating speed of non-powered transmission；Fig. 1 (c) is DCT change in torque curve maps, wherein solid dotted line represents dynamic
The transmitting torque of the axle correspondence clutch of power transmission, dotted line represents the axle correspondence clutch of non-powered transmission
Transmitting torque；Fig. 1 (d) is shift fork change in location curve map, and wherein solid line represents odd gear shift fork position
Put, solid dotted line represents even gear shift fork position；Fig. 1 (e) is speed change curve.
Vehicle is down to after 3 grades of clutch interactive controllings terminate from 4 grades, t1Moment synchronizes device and moves back a grade control；
t2At the moment, synchronizer moves back shelves control to be terminated, and moment of torsion is pulled less than shafting because clutch pulls moment of torsion, now non-
The axle of power transmission is that the rotating speed of even number axle can decline rapidly；t3Moment, even number rotating speed keeps zero-turn speed,
But now it is not up to synchronizer pre-engagement opportunity；t4At the moment, synchronizer pre-engagement opportunity is reached, into synchronization
Device enters a grade control, even number rotating speed rises until synchronizer engagement, completes 2 grades and enters shelves.
As shown in fig. 1,3 grades of stabilization travelings, t are down to from 4 gears3Even number rotating speed keeps turning from moment
Speed is zero, but not up to synchronizer pre-engagement opportunity, unanimously lasts till t4Moment just nibbles in advance into synchronizer
Conjunction opportunity, it is seen that this process duration is more long, and turning due to synchronizer two ends in this process
Speed difference is larger so that in t4-t5Easily noise is sent when stage enters 2 grades.
If moved back after shelves terminate in synchronizer, it is to avoid carried out in advance same into the even number axle rapid drop-down stage
Step device pre-engagement, i.e. synchronizer are moved back after grade control in t2Moment immediately enters synchronizer and enters the shelves control stage,
Can reduce and produce into a grade effect for noise possibility, but be stood due to being moved back after shelves control terminates in synchronizer
Pre-engagement is carried out, DCT oil consumption can be caused to increase.
Regarding to the issue above, the technical scheme of the embodiment of the present invention is by the axle and non-powered that are transmitted in power
When the speed discrepancy of the axle of transmission is more than or equal to first threshold, the corresponding clutch point of axle that power is transmitted
From the first set amount, the corresponding clutch of axle of non-powered transmission combines the second set amount, while asking hair
Tachometer value is risen to the first rotating speed to adjust the rotating speed of the axle of non-powered transmission, wherein described first sets by motivation
The value of quantitative and described second set amount is negatively correlated with the relative speed variation of the axle of power transmission, after adjustment
Speed discrepancy be less than Second Threshold when, request engine stop lifting rotating speed, power transmission axle correspondence from
Clutch is straight with reference to first set amount, and the control pressure of the axle correspondence clutch of reduction non-powered transmission
To opening completely, when the control pressure of the axle correspondence clutch of non-powered transmission is less than three threshold values
Synchronizer enters shelves, so that the rotating speed at synchronizer two ends is essentially identical when synchronizer enters grade, enters a grade control
Be more prone to, and then be not likely to produce into a grade noise, at the same time, due to only downshift point nearby when,
Pre-engagement instruction is sent, the synchronizer in non-powered transmission axle can just be engaged, so that DCT oil consumption is relatively low.
It is understandable to enable the above objects, features and advantages of the present invention to become apparent, below in conjunction with the accompanying drawings
Specific embodiment of the invention is described in detail.
The embodiment of the invention provides it is a kind of slide downshift operating mode under synchronizer pre-engagement control method, with
It is described in detail by specific steps down.
S201：When speed reaches downshift operating mode pre-engagement speed, the synchronizer sent into grade gear is nibbled in advance
Close control instruction.
In specific implementation, vehicle current operating state can be obtained by gathering the signal of sensor.
In embodiments of the present invention, when TCU detect vehicle reach downshift operating mode pre-engagement speed when, send into
The synchronizer pre-engagement control instruction of shelves gear.For example, vehicle is in 3 grades of stabilization travelings, when TCU detections
When reaching the pre-engagement speed of 2 grades of drop to vehicle, the synchronizer pre-engagements control for sending 2 grades of gears of extension refers to
Order.
S202：Judge the speed discrepancy of axle of axle and the non-powered transmission of power transmission whether more than or equal to the
One threshold value.
S203：When the axle of power transmission and the speed discrepancy of the axle of non-powered transmission are more than or equal to described
During first threshold, the corresponding set amount of clutch separation first of axle of power transmission, the axle of non-powered transmission
Corresponding clutch combines the second set amount, and engine speed is risen to the first rotating speed by request engine
To adjust the rotating speed of the axle of non-powered transmission；The value of wherein described first set amount and second set amount
The relative speed variation of the axle transmitted with the power is negatively correlated.
In specific implementation, when non-powered transmission axle rotating speed it is drop-down rapidly, when power transmission axle turn
When the difference of the tachometer value of speed value and the axle of non-powered transmission is more than or equal to the first threshold, power transmission
The corresponding clutch of axle to be separated from original binding capacity be a little the first set amount, the axle of non-powered transmission
To combine be a little the second set amount from decontroling completely for corresponding clutch, such as described first set amount can be with
1bar or so is set in, second set amount may be set in 1.6bar or so.Meanwhile, TCU can be with
Ask engine that rotating speed is promoted into the first rotating speed by sending request signal, to adjust non-powered transmission
Axle rotating speed.First rotating speed is more than rotating speed of target, and the rotating speed of target can be exported according to DCT
Rotating speed, enter grade gear gearratio and enter grade gear base ratio and calculate to obtain, so that non-powered is transmitted
The rotating speed of axle lifted, and then the between centers that the axle that power is transmitted transmits with the non-powered can be made
Speed discrepancy is less and less.
In specific implementation, the first threshold can take 400rpm, to reach preferable implementation result.
In specific implementation, what the first set amount and the non-powered that the axle that the power is transmitted is separate were transmitted
The value of the second set amount that axle is combined is to be based on the relative speed variation of the axle that power is transmitted and set.Specifically
Ground, the relative speed variation change is bigger, and the value of first set amount and second set amount is smaller,
Conversely, the relative speed variation change is smaller, the value of first set amount and second set amount is got over
Greatly.
S204：The speed discrepancy of the axle of axle and the non-powered transmission of power transmission after adjustment is less than the
During two threshold values, request engine stop lifting rotating speed, the corresponding clutch combination of axle of power transmission is described
First set amount, and reduce the control pressure of the axle correspondence clutch that non-powered is transmitted until opening completely.
In specific implementation, the rotating speed of the axle that the rotating speed of the axle of power transmission is transmitted with the non-powered is got over
Come closer to, when both speed differences reach Second Threshold, TCU request engine stop lifting rotating speed,
The corresponding clutch of axle of the power transmission combines first set amount, to recover to former binding capacity,
The corresponding clutch of axle of the non-powered transmission is gradually reduced control pressure, until decontroling completely.
In specific implementation, the Second Threshold can be set according to actual needs, be not limited herein.
S205：It is same when the control pressure of the axle correspondence clutch of non-powered transmission is less than three threshold values
Step device enters shelves.
In specific implementation, when the control pressure of the corresponding clutch of axle of non-powered transmission is less than the 3rd
During threshold value, a grade control is entered into synchronizer, synchronize device pre-engagement so that entered shelves and smoothly complete.
In specific implementation, the 3rd threshold value can be set according to actual needs, is not limited herein.
In specific implementation, can be more than in the speed discrepancy of the axle of axle and the non-powered transmission of power transmission or
During equal to first threshold, start timing；When the time that timing is obtained threshold time is exceeded, request is started
Machine stops lifting speed, and the corresponding clutch of axle of power transmission combines first set amount, and reduces
The corresponding clutch control pressure of axle of non-powered transmission until open completely.
In specific implementation, it is also possible to when the rotating speed rate of change of power transmission is more than relative speed variation threshold value,
Request engine stop lifting speed, the corresponding clutch of axle of power transmission combines first set amount,
And reduce the corresponding clutch control pressure of axle of non-powered transmission until opening completely.
In specific implementation, can also work as the axle of axle and the non-powered transmission of power transmission speed discrepancy be more than or
When rotating speed rate of change equal to the first threshold, and power transmission is less than or equal to relative speed variation threshold value,
The corresponding set amount of clutch separation first of axle of power transmission, the corresponding clutch of axle of non-powered transmission
Engine speed is risen to the first rotating speed to adjust non-powered with reference to the second set amount, and request engine
The rotating speed of the axle of transmission.
The embodiment of the present invention is promoted to than the rotating speed of target also by calculating rotating speed of target, request engine
The first big rotating speed, so that the rotating speed of the axle of non-powered transmission is able to be lifted without described non-
The rapid drop-down situation of rotating speed of the axle of power transmission, and then the axle that power is transmitted is passed with the non-powered
The speed discrepancy of the between centers passed is less and less, when the speed discrepancy reaches Second Threshold, enters into synchronizer
Shelves are controlled, and now synchronizer can be engaged smoothly because the rotating speed at two ends is close, be not likely to produce noise.With
This simultaneously as only downshift point nearby when, just send pre-engagement instruct, it is same in non-powered transmission axle
Step device can just be engaged, so that DCT oil consumption is relatively low.
Fig. 3 is a kind of 4 grades in the embodiment of the present invention and is down to 3 grades of processes of stabilization laggard 2 gear of traveling
Schematic diagram.
As illustrated, Fig. 3 (a) is throttle signal change curve；Fig. 3 (b) is DCT rotation speed change curves
Figure, wherein solid line represent engine speed, and solid dotted line represents the rotating speed of DCT power transmission, strokes and dots
Line represents the rotating speed of DCT non-powered transmission, and hollow dotted line represents the rotating speed of target of engine；Fig. 3 (c)
It is DCT change in torque curve maps, wherein solid dotted line represents the transmission of the axle correspondence clutch of power transmission
Moment of torsion, dotted line represents the transmitting torque of the axle correspondence clutch of non-powered transmission；Fig. 3 (d) is shift fork position
Change curve is put, wherein solid line represents odd gear shift fork position, and solid dotted line represents even gear shift fork
Position；Fig. 3 (e) is speed change curve.
Vehicle is after from 4 grades to 3 grades, downshift clutch interactive controlling terminates, t1Moment carries out shift fork and moves back 4 grades of controls
System.
t2At the moment, synchronizer moves back shelves control to be terminated, and 4 grades of shift forks are disengaged, and axle is less than because clutch pulls moment of torsion
System pulls moment of torsion, and the axle that now non-powered is transmitted is that the rotating speed of even number axle can decline rapidly.
t3At the moment, 2 grades of gear synchronizer pre-engagement instructions are sent, request engine lifts speed to first turn
Speed with lifted non-powered transmission axle (being now even number axle) rotating speed to rotating speed of target, reference can be made to Fig. 3
Solid line in (b)；At the same time, the corresponding odd number clutch of axle of power transmission is opened first and is set a little
Quantitative, the corresponding even number clutch of axle of non-powered transmission combines the second set amount a little, and the process can join
See the corresponding odd number clutch transmission torque of solid dotted line and the corresponding even number clutch of chain-dotted line in Fig. 3 (c)
Transmitting torque.First rotating speed be more than rotating speed of target, the rotating speed of target according to DCT export rotating speed,
Enter grade gear gearratio and enter grade gear base ratio and calculate acquisition.First set amount and described second
Set amount is based on the relative speed variation of the axle (being now odd number axle) of power transmission and sets, when odd number axle
Relative speed variation it is bigger, the value of first set amount and second set amount is smaller, otherwise.When
When odd number axle reaches Second Threshold with the speed discrepancy of even number axle, into t4Moment；
t4Moment, even number rotating speed has reached rotating speed of target, and the corresponding clutch of odd number axle increases control pressure,
With reference to first set amount to return to former binding capacity, even number clutch reduces control pressure to beating completely
Open.
t5At the moment, when even number clutch pressure is less than three threshold values, a grade control is entered into synchronizer, due to
Now the rotating speed difference at synchronizer two ends is smaller, and synchronizer is smoothed out engagement, it is to avoid synchronization rank
The unmanageable situation of section, is not easy to produce noise.
In specific implementation, can be more than in the speed discrepancy of the axle of axle and the non-powered transmission of power transmission or
During equal to first threshold, start timing；When the time that timing is obtained threshold time is exceeded, request is started
Machine stops lifting speed, and the corresponding clutch of axle of power transmission combines first set amount, and reduces
The corresponding clutch control pressure of axle of non-powered transmission until open completely.
In specific implementation, it is also possible to when the rotating speed rate of change of power transmission is more than relative speed variation threshold value,
Request engine stop lifting speed, the corresponding clutch of axle of power transmission combines first set amount,
And reduce the corresponding clutch control pressure of axle of non-powered transmission until opening completely.
In specific implementation, the rotating speed of the tachometer value of the axle of power transmission and the axle of non-powered transmission can also be worked as
The initial velocity difference of value is more than the first threshold, and the rotating speed rate of change of power transmission is less than or equal to turn
During fast rate of change threshold value, the corresponding set amount of clutch separation first of axle of power transmission, non-powered transmission
The corresponding clutch of axle combine the second set amount, and request engine engine speed is risen to first
Rotating speed with adjust non-powered transmission axle rotating speed.
The setting of the first rotating speed described in technical solution of the present invention, the DCT shown in reference picture 4 for convenience of description
Structure principle chart, and illustrated with reference to Fig. 3.
As shown in figure 4,1 is odd number clutch, 2 is even number clutch, and 3 is DCT, and 4 is wheel.
It is same that the corresponding clutch of axle of power transmission is 1 so that 4 downshifts are travelled into 2 grades to 3 grades of stabilizations as an example,
The corresponding clutch of axle of non-powered transmission is 2, works as t3Moment, synchronizer pre-engagement instruction sends, TCU
Request engine raising speed to the first rotating speed, first rotating speed is more than rotating speed of target.The rotating speed of target is
The speed for reaching is expected by engine raising speed, can be determined by calculating the value of rotating speed of target described
First rotating speed.The rotating speed of target exports rotating speed, enters grade gear gearratio and enters a grade gear according to DCT
Base ratio is calculated and obtained.
Specifically, it is assumed that 3 grades of gearratio i3, odd number shelves base ratio i10,2 grades of gearratio i2, even number
The rotating speed of shelves base ratio i20, DCT output shaft is Nout, then axle (this of the non-powered transmission
When be even number axle) rotating speed be Nout*i20*i2, using this speed as the rotating speed of target Ntarget of engine,
The signal of the lifting rotating speed of request engine is sent, it is big that the semaphore request engine raises the speed for reaching
In Nout*i20*i2, so, the rotating speed of even number axle can be lifted gradually to reach Nout*i20*i2,
So that the rotating speed of synchronizer drive end and driven end is approached, so as to be not likely to produce when synchronizer enters grade
Noise.
Fig. 5 is the control device that a kind of in the embodiment of the present invention slides synchronizer pre-engagement under downshift operating mode
Structural representation.Described device 50 can include：Instruction issue unit 51, the first judging unit 52,
First control unit 53, the second control unit 54, the 3rd control unit 55
Instruction issue unit 51, is suitable to, when speed reaches downshift operating mode pre-engagement speed, send into shelves shelves
The synchronizer pre-engagement control instruction of position；
First judging unit 52, is suitable to before having the synchronizer pre-engagement control instruction into grade gear to send
Put, judge whether the axle of power transmission is more than or equal to the first threshold with the speed discrepancy of the axle of non-powered transmission
Value；
First control unit 53, is suitable to the speed discrepancy of the axle and the axle of non-powered transmission when power transmission
During more than or equal to the first threshold, the corresponding set amount of clutch separation first of axle of power transmission,
The corresponding clutch of axle of non-powered transmission combines the second set amount, and request engine turns engine
Speed rises to the first rotating speed to adjust the rotating speed of the axle of non-powered transmission；Wherein described first set amount and described
The relative speed variation of the axle that the value of the second set amount is transmitted with the power is negatively correlated；
Second control unit 54, is suitable to the axle of power transmission after adjustment and the axle of non-powered transmission
Speed discrepancy be less than Second Threshold when, request engine stop lifting rotating speed, power transmission axle it is corresponding
Clutch combines first set amount, and the control pressure for reducing the axle correspondence clutch of non-powered transmission
Until opening completely；
3rd control unit 55, is suitable to when the control pressure of the axle correspondence clutch of non-powered transmission is small
Synchronizer enters shelves when three threshold values.
In specific implementation, first rotating speed is more than rotating speed of target.
In specific implementation, the rotating speed of target according to DCT export rotating speed, enter grade gear gearratio and
Enter grade gear base ratio and calculate acquisition.
In specific implementation, second control unit 54 is further adapted for：When the axle and non-powered of power transmission
The speed discrepancy of the axle of transmission is more than or equal to first threshold, starts timing；When the time that timing is obtained exceedes
During threshold time, request engine stop lifting rotating speed, the corresponding clutch combination institute of axle of power transmission
The first set amount is stated, and reduces the control pressure of the corresponding clutch of axle that non-powered is transmitted until beating completely
Open.
In specific implementation, second control unit 54 is further adapted for：When the rotating speed change of power transmission
When rate is more than or equal to relative speed variation threshold value, request engine stop lifting rotating speed, the axle of power transmission
Corresponding clutch combines first set amount, and the corresponding clutch control of axle for reducing non-powered transmission
Pressing pressure until open completely.
In specific implementation, first control unit 51 is further adapted for：When the axle and non-powered of power transmission
The speed discrepancy of the axle of transmission is small more than or equal to the relative speed variation of the axle that the first threshold and power are transmitted
When relative speed variation threshold value, the corresponding set amount of clutch separation first of axle of power transmission,
The corresponding clutch of axle of non-powered transmission combines the second set amount, and request engine turns engine
Speed rises to the first rotating speed to adjust the rotating speed of the axle of non-powered transmission.
The embodiment of the present invention also provides a kind of TCU, and the TCU can slide downshift operating mode including above-mentioned
The control device 50 of lower synchronizer pre-engagement.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment
Rapid to can be by program to instruct the hardware of correlation to complete, the program can be stored in can with computer
Read in storage medium, storage medium can include：ROM, RAM, disk or CD etc..
Although present disclosure is as above, the present invention is not limited to this.Any those skilled in the art,
Without departing from the spirit and scope of the present invention, can make various changes or modifications, therefore guarantor of the invention
Shield scope should be defined by claim limited range.
Claims (13)
1. it is a kind of slide downshift operating mode under synchronizer pre-engagement control method, it is characterised in that including：
When speed reaches downshift operating mode pre-engagement speed, the synchronizer pre-engagement control sent into grade gear refers to
Order；
Judge whether the axle of power transmission is more than or equal to first threshold with the speed discrepancy of the axle of non-powered transmission；
When the axle of power transmission is more than or equal to the first threshold with the speed discrepancy of the axle of non-powered transmission
When, the corresponding set amount of clutch separation first of axle of power transmission, the axle of non-powered transmission is corresponding
Clutch combines the second set amount, and engine speed is risen to the first rotating speed to adjust by request engine
The rotating speed of the axle of whole non-powered transmission；The value of wherein described first set amount and second set amount with
The relative speed variation of the axle of the power transmission is negatively correlated；
The axle of power transmission after adjustment is less than Second Threshold with the speed discrepancy of the axle of non-powered transmission
When, request engine stop lifting rotating speed, the corresponding clutch of axle of power transmission combines described first
Set amount, and reduce the control pressure of the axle correspondence clutch that non-powered is transmitted until opening completely；
When the control pressure of the axle correspondence clutch of non-powered transmission is less than three threshold values, synchronizer enters
Shelves.
2. it is according to claim 1 slide downshift operating mode under synchronizer pre-engagement control method, its feature
It is that first rotating speed is more than rotating speed of target.
3. it is according to claim 2 slide downshift operating mode under synchronizer pre-engagement control method, its feature
It is that the rotating speed of target exports rotating speed, enters grade gear gearratio and enter a grade gear master according to DCT
Speed reducing ratio is calculated and obtained.
4. it is according to claim 1 slide downshift operating mode under synchronizer pre-engagement control method, its feature
It is also to include：
When the axle of power transmission is more than or equal to first threshold with the speed discrepancy of the axle of non-powered transmission, start
Timing；
When the time that timing is obtained threshold time is exceeded, request engine stop lifting rotating speed, power transmission
The corresponding clutch of axle combine first set amount, and reduce non-powered transmission axle it is corresponding from
The control pressure of clutch until open completely.
5. it is according to claim 1 slide downshift operating mode under synchronizer pre-engagement control method, its feature
It is also to include：
When the rotating speed rate of change of power transmission is more than or equal to relative speed variation threshold value, request engine stops
Rotating speed is only lifted, the corresponding clutch of axle of power transmission combines first set amount, and reduces non-
The corresponding clutch control pressure of axle of power transmission until open completely.
6. it is according to claim 1 slide downshift operating mode under synchronizer pre-engagement control method, its feature
It is also to include：
When the axle of power transmission is more than or equal to the first threshold and moves with the speed discrepancy of the axle of non-powered transmission
When the relative speed variation of the axle of power transmission is less than or equal to relative speed variation threshold value, the axle pair of power transmission
The set amount of clutch separation first answered, the corresponding clutch of axle of non-powered transmission combines the second setting
Engine speed is risen to the first rotating speed to adjust the axle that non-powered is transmitted by amount, and request engine
Rotating speed.
7. it is a kind of slide downshift operating mode under synchronizer pre-engagement control device, it is characterised in that including：
Instruction issue unit, is suitable to, when speed reaches downshift operating mode pre-engagement speed, send into grade gear
Synchronizer pre-engagement control instruction；
First judging unit, is suitable on the premise of having the synchronizer pre-engagement control instruction into grade gear to send,
Judge whether the axle of power transmission is more than or equal to first threshold with the speed discrepancy of the axle of non-powered transmission；
First control unit, the speed discrepancy for being suitable to the axle transmitted with non-powered when the axle of power transmission is more than
Or during equal to the first threshold, the corresponding set amount of clutch separation first of axle of power transmission is non-
The corresponding clutch of axle of power transmission combines the second set amount, and request engine turns engine
Speed rises to the first rotating speed to adjust the rotating speed of the axle of non-powered transmission；Wherein described first set amount and institute
The relative speed variation for stating the axle that the value of the second set amount is transmitted with the power is negatively correlated；
Second control unit, is suitable to the axle of power transmission after adjustment and turning for the axle of non-powered transmission
Speed difference be less than Second Threshold when, request engine stop lifting rotating speed, power transmission axle it is corresponding from
Clutch combines first set amount, and the control pressure for reducing the axle correspondence clutch of non-powered transmission
Until opening completely；
3rd control unit, is suitable to the control pressure when the axle correspondence clutch of non-powered transmission less than the
Synchronizer enters shelves during three threshold values.
8. it is according to claim 7 slide downshift operating mode under synchronizer pre-engagement control device, its feature
It is that first rotating speed is more than rotating speed of target.
9. it is according to claim 8 slide downshift operating mode under synchronizer pre-engagement control device, its feature
It is that the rotating speed of target exports rotating speed, enters grade gear gearratio and enter a grade gear master according to DCT
Speed reducing ratio is calculated and obtained.
10. it is according to claim 7 slide downshift operating mode under synchronizer pre-engagement control device, its feature
It is that second control unit is further adapted for：
When the axle of power transmission is more than or equal to first threshold with the speed discrepancy of the axle of non-powered transmission, start meter
When；When the time that timing is obtained threshold time is exceeded, request engine stop lifting rotating speed, power
The corresponding clutch of axle of transmission combines first set amount, and the axle correspondence for reducing non-powered transmission
Clutch control pressure until open completely.
11. it is according to claim 7 slide downshift operating mode under synchronizer pre-engagement control device, its feature
It is that second control unit is further adapted for：
When the rotating speed rate of change of power transmission is more than or equal to relative speed variation threshold value, request engine stops
Rotating speed is only lifted, the corresponding clutch of axle of power transmission combines first set amount, and reduces non-
The corresponding clutch control pressure of axle of power transmission until open completely.
12. it is according to claim 7 slide downshift operating mode under synchronizer pre-engagement control device, its feature
It is that first control unit is further adapted for：
When the axle of power transmission is more than or equal to the first threshold and moves with the speed discrepancy of the axle of non-powered transmission
When the relative speed variation of the axle of power transmission is less than or equal to relative speed variation threshold value, the axle pair of power transmission
The set amount of clutch separation first answered, the corresponding clutch of axle of non-powered transmission combines the second setting
Engine speed is risen to the first rotating speed to adjust the axle that non-powered is transmitted by amount, and request engine
Rotating speed.
A kind of 13. TCU, including slide synchronizer pre-engagement under downshift operating mode described in claim any one of 7-12
Control device.
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| CN111963585A (en) * | 2019-05-20 | 2020-11-20 | 上海汽车集团股份有限公司 | Clutch control method and clutch control system |
| CN111963678A (en) * | 2019-05-20 | 2020-11-20 | 上海汽车集团股份有限公司 | Method and device for determining shifting fork synchronization point |
| CN112392945A (en) * | 2020-12-07 | 2021-02-23 | 安徽江淮汽车集团股份有限公司 | Gear shifting control method, gear shifting control device, gear shifting control equipment and storage medium |
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| CN112392945A (en) * | 2020-12-07 | 2021-02-23 | 安徽江淮汽车集团股份有限公司 | Gear shifting control method, gear shifting control device, gear shifting control equipment and storage medium |
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