CN106907477B - Slide control method, device and the TCU of synchronizer pre-engagement under downshift operating mode - Google Patents
Slide control method, device and the TCU of synchronizer pre-engagement under downshift operating mode Download PDFInfo
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- CN106907477B CN106907477B CN201510979484.3A CN201510979484A CN106907477B CN 106907477 B CN106907477 B CN 106907477B CN 201510979484 A CN201510979484 A CN 201510979484A CN 106907477 B CN106907477 B CN 106907477B
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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
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Control Of Transmission Device (AREA)
- Mechanical Operated Clutches (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
Abstract
A kind of control method for sliding synchronizer pre-engagement under downshift operating mode,Device and TCU,When the method is greater than or equal to first threshold by the speed discrepancy of axis and the axis of non-powered transmission in power transmission,By corresponding the first set amount of clutch separation of the axis of power transmission,The corresponding clutch of axis of non-powered transmission combines the second set amount,Ask engine that tachometer value is risen to the first rotating speed to adjust the rotating speed of the axis of non-powered transmission at the same time,The wherein value of the first set amount and the second set amount and the relative speed variation of the axis of power transmission is negatively correlated,When the speed discrepancy after adjustment is less than second threshold,Ask engine stop lifting rotating speed,The axis of power transmission corresponds to clutch with reference to first set amount,And the axis of reduction non-powered transmission corresponds to the control pressure of clutch until opening completely,When the control pressure that the axis of the non-powered transmission corresponds to clutch is less than three threshold values, synchronizer is into shelves,So as to avoid producing into shelves noise,Reduce DCT oil consumption.
Description
Technical field
The present invention relates to automotive field, more particularly to it is a kind of slide the control method of synchronizer pre-engagement under downshift operating mode,
Device and TCU.
Background technology
DCT (Dual Clutch Transmission, double-clutch speed changer) is a kind of automatic transmission, since it has
Shift process power is uninterrupted, the advantages such as oil consumption is low, becomes a kind of current popular automatic gearbox.
Similar with manual transmission, DCT also has synchronizer and a shifting fork mechanism, synchronizer can make will meshed gears reach
Gearshift is smoothly engaged to consistent rotating speed, shortens shift time.But when synchronizer both ends speed discrepancy is larger, particularly exist
Slide under downshift operating mode, be frequently present of the synchronization stage it is unmanageable the problem of, so as to bring into shelves noise.If downshifting
Operating mode clutch interactive controlling is once terminating to carry out pre-engagement immediately, it may appear that vehicle stabilization has at the same time on odd even number axis when driving
Synchronizer is in place, so as to 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 produces noise into shelves, subtract at the same time
Small DCT oil consumption.
To solve the above problems, the present invention provides a kind of control method for sliding synchronizer pre-engagement under downshift operating mode, institute
The method of stating includes：
When speed reaches downshift operating mode pre-engagement speed, the synchronizer pre-engagement control instruction into shelves gear is sent；
Judge whether the speed discrepancy of the axis of power transmission and the axis of non-powered transmission is greater than or equal to first threshold；
When the speed discrepancy of the axis and the axis of non-powered transmission of the power transmission is greater than or equal to the first threshold, move
Corresponding the first set amount of clutch separation of axis of power transmission, the corresponding clutch of axis of non-powered transmission combine the second setting
Engine speed is risen to the first rotating speed to adjust the rotating speed of the axis of non-powered transmission by amount, and request engine；It is wherein described
The value of first set amount and second set amount and the relative speed variation of the axis of the power transmission are negatively correlated；
When the speed discrepancy of the axis and the axis of non-powered transmission of the power transmission after adjustment is less than second threshold, request
Engine stop lifts rotating speed, and the corresponding clutch of axis of power transmission is with reference to first set amount, and reduces non-powered and pass
The axis passed corresponds to the control pressure of clutch until opening completely；
When the control pressure that the axis of the non-powered transmission corresponds to clutch is less than three threshold values, synchronizer is into shelves.
Alternatively, first rotating speed is more than rotating speed of target.
Alternatively, the rotating speed of target exports rotating speed, into shelves gear gearratio and into shelves gear base ratio according to DCT
Calculate and obtain.
Alternatively, the control method for sliding synchronizer pre-engagement under downshift operating mode, further includes：
When the speed discrepancy of the axis and the axis of non-powered transmission of power transmission is greater than or equal to first threshold, start timing；
When the time that timing obtains exceeding threshold time, request engine stop lifting rotating speed, the axis pair of power transmission
The clutch answered is with reference to first set amount, and reduces the control pressure of the corresponding clutch of axis of non-powered transmission until complete
It is complete to open.
Alternatively, the control method for sliding synchronizer pre-engagement under downshift operating mode, further includes：
When the rotating speed change rate of power transmission is more than relative speed variation threshold value, request engine stop lifting rotating speed,
The corresponding clutch of axis of power transmission is with reference to first set amount, and reduces the corresponding clutch control of axis of non-powered transmission
Pressing pressure until open completely.
Alternatively, the control method for sliding synchronizer pre-engagement under downshift operating mode, further includes：
When the axis of power transmission and the speed discrepancy of the axis of non-powered transmission are greater than or equal to the first threshold and power biography
When the relative speed variation for the axis passed is less than or equal to relative speed variation threshold value, the corresponding clutch separation first of axis of power transmission
Set amount, the corresponding clutch of axis of non-powered transmission combines the second set amount, and asks engine by engine speed liter
To the first rotating speed to adjust the rotating speed of the axis of non-powered transmission.
The embodiment of the present invention also provides a kind of control device for sliding synchronizer pre-engagement under downshift operating mode, described device bag
Include：
Instruction issue unit, suitable for when speed reaches downshift operating mode pre-engagement speed, sending the synchronizer into shelves gear
Pre-engagement control instruction；
First judging unit, suitable on the premise of thering is the synchronizer pre-engagement control instruction into shelves gear to send, judging
Whether the axis of power transmission and the speed discrepancy of the axis of non-powered transmission are greater than or equal to first threshold；
First control unit, suitable for being greater than or equal to when the speed discrepancy of the axis and the axis of non-powered transmission of the power transmission
During the first threshold, corresponding the first set amount of clutch separation of axis of power transmission, the axis of non-powered transmission it is corresponding from
Clutch combines the second set amount, and engine speed is risen to the first rotating speed to adjust the axis of non-powered transmission by request engine
Rotating speed；The value and the relative speed variation of the axis of the power transmission of wherein described first set amount and second set amount are born
It is related；
Second control unit, the speed discrepancy suitable for the axis and the axis of non-powered transmission of power transmission after adjustment are small
When second threshold, request engine stop lifting rotating speed, the corresponding clutch of axis of power transmission is with reference to the described first setting
Amount, and the axis of reduction non-powered transmission correspond to the control pressure of clutch until opening completely；
3rd control unit, is less than the 3rd threshold value suitable for corresponding to the control pressure of clutch when the axis of the non-powered transmission
When synchronizer into shelves.
Alternatively, first rotating speed is more than rotating speed of target.
Alternatively, the rotating speed of target exports rotating speed, into shelves gear gearratio and into shelves gear base ratio according to DCT
Calculate and obtain.
Alternatively, second control unit is further adapted for：
When the axis of power transmission and the speed discrepancy of the axis of non-powered transmission are greater than or equal to first threshold, beginning timing；When
When the time that timing obtains exceedes threshold time, request engine stop lifting rotating speed, the corresponding clutch of axis of power transmission
With reference to first set amount, and reduce the control pressure of the corresponding clutch of axis of non-powered transmission until opening completely.
Alternatively, second control unit is further adapted for：
When the rotating speed change rate of power transmission is more than relative speed variation threshold value, request engine stop lifting rotating speed,
The corresponding clutch of axis of power transmission is with reference to first set amount, and reduces the corresponding clutch control of axis of non-powered transmission
Pressing pressure until open completely.
Alternatively, first control unit is further adapted for：
When the axis of power transmission and the speed discrepancy of the axis of non-powered transmission are greater than or equal to the first threshold and power biography
When the relative speed variation for the axis passed is less than or equal to relative speed variation threshold value, the corresponding clutch separation first of axis of power transmission
Set amount, the corresponding clutch of axis of non-powered transmission combines the second set amount, and asks engine by engine speed liter
To the first rotating speed to adjust the rotating speed of the axis of non-powered transmission.
The embodiment of the present invention also provides a kind of TCU, including the above-mentioned control for sliding synchronizer pre-engagement under downshift operating mode
Device.
Compared with prior art, the technical solution of the embodiment of the present invention has the advantages that：
The technical solution of the embodiment of the present invention is more than by the speed discrepancy of axis and the axis of non-powered transmission in power transmission
Or during equal to first threshold, by corresponding the first set amount of clutch separation of the axis of power transmission, the axis of non-powered transmission corresponds to
Clutch combine the second set amount, while ask engine that tachometer value is risen to the first rotating speed to adjust the axis of non-powered transmission
Rotating speed, wherein the relative speed variation negative of the axis of the value of first set amount and second set amount and power transmission
Close, when the speed discrepancy after adjustment is less than second threshold, request engine stop lifting rotating speed, the axis of power transmission corresponds to clutch
Device corresponds to the control pressure of clutch until opening completely with reference to first set amount, and the axis of reduction non-powered transmission, when
Synchronizer is into shelves when the control pressure that the axis of the non-powered transmission corresponds to clutch is less than three threshold values, so that synchronizer
Rotating speed into synchronizer both ends during shelves is essentially identical, is more prone into shelves control, and then is not likely to produce into shelves noise, same with this
When, due to only when downshifting point nearby, just sending pre-engagement and instructing, the synchronizer in non-powered transmission axle can just engage, so that
DCT oil consumption is relatively low.
Further, due to the first set amount of the corresponding clutch separation of the axis of power transmission and the axis of non-powered transmission
The second set amount that corresponding clutch combines, is set based on the rotating speed change rate of power transmission, when the axis of power transmission
Relative speed variation is smaller, and the value of first set amount and second set amount is bigger, so as to avoid vehicle deceleration different
The synchronization control effect brought 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 for stablizing laggard 2 gear of traveling；
Fig. 2 is a kind of flow for sliding the control method of synchronizer pre-engagement under downshift operating mode in the embodiment of the present invention
Figure；
Fig. 3 is that a kind of 4 grades in the embodiment of the present invention are down to 3 grades of process schematics for stablizing laggard 2 gear of traveling；
Fig. 4 is a kind of DCT structure principle charts in the embodiment of the present invention；
Fig. 5 is the structure diagram of TCU in the embodiment of the present invention a kind of.
Embodiment
At present, the synchronizer of DCT vehicles can make will meshed gears reach consistent rotating speed and smoothly engage gearshift.
But when synchronizer both ends speed discrepancy is larger, particularly in the case where sliding downshift operating mode, being frequently present of the synchronization stage is difficult to
The problem of control, so as to bring into shelves noise.If in downshift operating mode clutch interactive controlling once terminating to be nibbled in advance immediately
Close, it may appear that vehicle stabilization has that synchronizer is in place at the same time on odd even number axis when driving, so as to cause DCT oil consumption higher.
To cause those skilled in the art to more fully understand the above problem, Fig. 1 is shown is down to 2 for 4 grades in the prior art
The downshift process schematic of shelves.
Fig. 1 (a) is throttle signal change curve；Fig. 1 (b) is DCT rotation speed change curve maps, and wherein solid line represents to start
Machine rotating speed, solid dotted line represent the rotating speed of DCT power transmission, and dotted line represents the rotating speed of DCT non-powered transmission；Fig. 1 (c)
For DCT change in torque curve maps, wherein solid dotted line represents that the axis of power transmission corresponds to the transmission moment of torsion of clutch, dotted line table
Show that the axis of non-powered transmission corresponds to the transmission moment of torsion of clutch；Fig. 1 (d) is shift fork change in location curve map, and wherein solid line represents
Odd gear shift fork position, solid dotted line represent even gear shift fork position；Fig. 1 (e) is speed change curve.
Vehicle is from after 4 grades are down to 3 grades of clutch interactive controllings, t1Moment synchronizes device and moves back a grade control；t2Moment,
Synchronizer, which moves back shelves control, to be terminated, and is less than shafting dragging moment of torsion, axis, that is, even number of non-powered transmission at this time because clutch pulls moment of torsion
The rotating speed of axis can decline rapidly；t3At the moment, even number rotating speed keeps zero-turn speed, but is not up to synchronizer pre-engagement opportunity at this time；t4
At the moment, reach synchronizer pre-engagement opportunity, is controlled into synchronizer into shelves, and even number rotating speed rises until synchronizer engagement, complete
Into 2 grades into shelves.
As shown in fig. 1,3 grades are down to from 4 gears and stablize traveling, t3It is zero that even number rotating speed, which keeps rotating speed, from moment, but
Not up to synchronizer pre-engagement opportunity, unanimously continue to t4Moment just enters synchronizer pre-engagement opportunity, it is seen that this process continues
Time is longer, and in this process since the rotating speed difference at synchronizer both ends is larger so that in t4-t5It is easy when stage is into 2 grades
Send noise.
If after synchronizer moves back shelves, avoid enter into even number axis and pull down the stage rapidly and synchronize device in advance and nibble in advance
Close, i.e., synchronizer is moved back after grade control in t2Moment immediately enters synchronizer and controls the stage into shelves, can reduce and produce into shelves noise
The effect of possibility, but due to moving back grade control in synchronizer after carry out pre-engagement immediately, can cause DCT oil consumption increase.
In view of the above-mentioned problems, the technical solution of the embodiment of the present invention passes through the axis and the axis of non-powered transmission in power transmission
Speed discrepancy when being greater than or equal to first threshold, by corresponding the first set amount of clutch separation of the axis of power transmission, non-powered
The corresponding clutch of axis of transmission combines the second set amount, while it is non-to adjust to ask engine that tachometer value is risen to the first rotating speed
The rotating speed of the axis of power transmission, wherein the value of first set amount and second set amount and the rotating speed of the axis of power transmission
Change rate is negatively correlated, when the speed discrepancy after adjustment is less than second threshold, request engine stop lifting rotating speed, power transmission
Axis corresponds to clutch and corresponds to the control pressure of clutch until complete with reference to first set amount, and the axis of reduction non-powered transmission
It is complete to open, when the control pressure that the axis of the non-powered transmission corresponds to clutch is less than three threshold values synchronizer into shelves so that
So that rotating speed of the synchronizer into synchronizer both ends during shelves is essentially identical, it is more prone into shelves control, and then be not likely to produce into shelves and make an uproar
Sound, at the same time, due to only when downshifting point nearby, just sending pre-engagement and instructing, the synchronizer just meeting in non-powered transmission axle
Engagement, 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 to the present invention
Specific embodiment be described in detail.
An embodiment of the present invention provides a kind of control method for sliding synchronizer pre-engagement under downshift operating mode, below by way of tool
Body step is described in detail.
S201：When speed reaches downshift operating mode pre-engagement speed, the synchronizer pre-engagement control sent into shelves gear refers to
Order.
In specific implementation, vehicle current working status can be obtained by gathering the signal of sensor.In the present invention
In embodiment, when TCU detects that vehicle reaches downshift operating mode pre-engagement speed, the synchronizer pre-engagement control into shelves gear is sent
System instruction.For example, vehicle stablizes traveling at 3 grades, when TCU detects that vehicle reaches the pre-engagement speed of 2 grades of drop, extension 2 is sent
The synchronizer pre-engagement control instruction of shelves gear.
S202：Judge whether the speed discrepancy of the axis of power transmission and the axis of non-powered transmission is greater than or equal to first threshold.
S203：When the speed discrepancy of the axis and the axis of non-powered transmission of the power transmission is greater than or equal to the first threshold
When, corresponding the first set amount of clutch separation of axis of power transmission, the corresponding clutch of axis of non-powered transmission combines second
Engine speed is risen to the first rotating speed to adjust the rotating speed of the axis of non-powered transmission by set amount, and request engine；Wherein
The value of first set amount and second set amount and the relative speed variation of the axis of the power transmission are negatively correlated.
In specific implementation, when the rotating speed of the axis of non-powered transmission pulls down rapidly, when power transmission axis tachometer value with it is non-
When the difference of the tachometer value of the axis of power transmission is greater than or equal to the first threshold, the corresponding clutch of axis of power transmission is from original
A little binding capacity separation come is the first set amount, and the corresponding clutch of axis of non-powered transmission is combined from complete relieving is a little
Second set amount, such as first set amount may be set in 1bar or so, and second set amount may be set in
1.6bar left and right.Meanwhile TCU can ask engine that rotating speed is promoted to the first rotating speed by sending request signal, to adjust
The rotating speed of the axis of whole non-powered transmission.First rotating speed is more than rotating speed of target, and the rotating speed of target can be according to DCT output shafts
Rotating speed, into shelves gear gearratio and into shelves gear base ratio calculate obtain so that the rotating speed of the axis of non-powered transmission obtains
With lifting, and then the speed discrepancy of the axis and the between centers of the non-powered transmission of power transmission can be made less and less.
In specific implementation, the first threshold can take 400rpm, to reach preferable implementation result.
In specific implementation, what the axis of separated first set amount of axis of the power transmission and the non-powered transmission combined
The value of second set amount is the relative speed variation of the axis based on power transmission and sets.Specifically, the relative speed variation becomes
Change is bigger, and the value of first set amount and second set amount is smaller, conversely, the relative speed variation changes smaller, institute
The value for stating the first set amount and second set amount is bigger.
S204：The axis of power transmission after adjustment and the speed discrepancy of the axis of non-powered transmission are less than second threshold
When, request engine stop lifting rotating speed, the corresponding clutch of axis of power transmission is with reference to first set amount, and reduces non-
The axis of power transmission corresponds to the control pressure of clutch until opening completely.
In specific implementation, the rotating speed of the axis of the power transmission and the rotating speed of the axis of the non-powered transmission increasingly connect
Closely, when both speed differences reach second threshold, TCU request engine stop lifting rotating speeds, the axis pair of the power transmission
The clutch answered is with reference to first set amount, to recover to former binding capacity, the corresponding clutch of axis of the non-powered transmission
Control pressure is gradually reduced, until decontroling completely.
In specific implementation, the second threshold can be set according to actual needs, be not limited herein.
S205：When the control pressure that the axis of the non-powered transmission corresponds to clutch is less than three threshold values synchronizer into
Shelves.
In specific implementation, when the control pressure of the corresponding clutch of axis of the non-powered transmission is less than three threshold values,
Controlled into synchronizer into shelves, synchronize device pre-engagement so that smoothly complete into shelves.
In specific implementation, the 3rd threshold value can be set according to actual needs, be not limited herein.
In specific implementation, first can be greater than or equal in the axis of power transmission and the speed discrepancy of the axis of non-powered transmission
During threshold value, start timing；When the time that timing obtains exceeding threshold time, request engine stop lifting speed, power passes
The corresponding clutch of axis passed is with reference to first set amount, and reduces the corresponding clutch control pressure of axis of non-powered transmission
Until open completely.
In specific implementation, hair can also be asked when the rotating speed change rate of power transmission is more than relative speed variation threshold value
Motivation stops lifting speed, and the corresponding clutch of axis of power transmission is with reference to first set amount, and reduces non-powered transmission
The corresponding clutch control pressure of axis until completely open.
In specific implementation, the axis of power transmission and the speed discrepancy of the axis of non-powered transmission can also be worked as more than or equal to described
First threshold, and when the rotating speed change rate of power transmission is less than or equal to relative speed variation threshold value, the axis of power transmission is corresponding
The first set amount of clutch separation, the corresponding clutch of axis of non-powered transmission combine the second set amount, and request engine
Engine speed is risen into the first rotating speed to adjust the rotating speed of the axis of non-powered transmission.
The embodiment of the present invention is promoted to first also bigger than the rotating speed of target by calculating rotating speed of target, request engine
Rotating speed, so that the rotating speed that the rotating speed of the axis of non-powered transmission is able to be lifted without the axis of the non-powered transmission is fast
The situation of speed drop-down, and then make the speed discrepancy of the axis and the between centers of the non-powered transmission of power transmission less and less, when described
When speed discrepancy reaches second threshold, controlled into synchronizer into shelves, synchronizer can be smoothly since the rotating speed at both ends approaches at this time
Engagement, is not likely to produce noise.At the same time, due to only when downshifting point nearby, just sending pre-engagement instruction, non-powered transmission axle
On synchronizer can just engage so that DCT oil consumption is relatively low.
Fig. 3 is that a kind of 4 grades in the embodiment of the present invention are down to 3 grades of process schematics for stablizing laggard 2 gear of traveling.
As shown in the figure, Fig. 3 (a) is throttle signal change curve；Fig. 3 (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 the axis of DCT non-powered transmission
Rotating speed, hollow dotted line represent the rotating speed of target of engine；Fig. 3 (c) is DCT change in torque curve maps, wherein solid dotted line represents
The axis of power transmission corresponds to the transmission moment of torsion of clutch, and dotted line represents that the axis of non-powered transmission corresponds to the transmission torsion of clutch
Square；Fig. 3 (d) is shift fork change in location curve map, and 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 from 4 grades to 3 grades after downshift clutch interactive controlling, t1Moment carries out shift fork and moves back 4 grades of controls.
t2At the moment, synchronizer, which moves back shelves control, to be terminated, and 4 grades of shift forks disengage, and is turned round because clutch pulls moment of torsion less than shafting dragging
Square, the rotating speed of axis, that is, even number axis of non-powered transmission at this time can decline rapidly.
t3At the moment, 2 grades of gear synchronizer pre-engagement instructions are sent, request engine lifts speed to the first rotating speed to be lifted
The rotating speed of the axis (being at this time even number axis) of non-powered transmission is to rotating speed of target, reference can be made to the solid line in Fig. 3 (b)；At the same time, move
The corresponding odd number clutch of axis of power transmission opens the first set amount a little, and the corresponding even number clutch of axis of non-powered transmission is few
Perhaps the second set amount is combined, which can be found in the corresponding odd number clutch transmission torque of solid dotted line in Fig. 3 (c) and chain-dotted line
Corresponding even number clutch transmission torque.First rotating speed is more than rotating speed of target, and the rotating speed of target turns according to DCT output shafts
Speed, into shelves gear gearratio and into shelves gear base ratio calculate obtain.First set amount and the second set amount base
Set in the relative speed variation of the axis (being at this time odd number axis) of power transmission, it is described when the relative speed variation of odd number axis is bigger
The value of first set amount and second set amount is smaller, on the contrary.When the speed discrepancy of odd number axis and even number axis reaches second threshold
When, into t4Moment；
t4Moment, even number rotating speed have reached rotating speed of target, the corresponding clutch increase control pressure of odd number axis, with reference to institute
The first set amount is stated to return to former binding capacity, even number clutch reduces control pressure and opened to complete.
t5At the moment, when even number clutch pressure is less than three threshold values, control into synchronizer into shelves, due to synchronous at this time
The rotating speed difference at device both ends is smaller, and synchronizer is smoothed out engaging, and avoids the situation that the synchronization stage is difficult to control, also not
It is also easy to produce noise.
In specific implementation, first can be greater than or equal in the axis of power transmission and the speed discrepancy of the axis of non-powered transmission
During threshold value, start timing；When the time that timing obtains exceeding threshold time, request engine stop lifting speed, power passes
The corresponding clutch of axis passed is with reference to first set amount, and reduces the corresponding clutch control pressure of axis of non-powered transmission
Until open completely.
In specific implementation, hair can also be asked when the rotating speed change rate of power transmission is more than relative speed variation threshold value
Motivation stops lifting speed, and the corresponding clutch of axis of power transmission is with reference to first set amount, and reduces non-powered transmission
The corresponding clutch control pressure of axis until completely open.
In specific implementation, can also work as the axis of power transmission tachometer value and the tachometer value of the axis of non-powered transmission it is initial
Speed difference is more than the first threshold, and when the rotating speed change rate of power transmission is less than or equal to relative speed variation threshold value, power
Corresponding the first set amount of clutch separation of axis of transmission, the corresponding clutch of axis of non-powered transmission combine the second set amount,
And engine speed is risen to the first rotating speed to adjust the rotating speed of the axis of non-powered transmission by request engine.
The setting of first rotating speed described in technical solution of the present invention for convenience of description, the DCT structural principles with reference to shown in Fig. 4
Figure, and illustrated with reference to Fig. 3.
As shown in figure 4,1 is odd number clutch, 2 be even number clutch, and 3 be DCT, and 4 be wheel.Equally with 4 downshifts to 3 grades
Stabilization is travelled into exemplified by 2 grades, and the corresponding clutch of axis of power transmission is 1, and the corresponding clutch of axis of non-powered transmission is 2,
Work as t3Moment, the instruction of synchronizer pre-engagement are sent, and TCU request engine raising speed to the first rotating speed, first rotating speeds is more than mesh
Mark rotating speed.The rotating speed of target is by engine raising speed it is expected the speed reached, can be by calculating the value of rotating speed of target
To determine first rotating speed.The rotating speed of target exports rotating speed according to DCT, subtracts into shelves gear gearratio and into shelves gear master
Speed is obtained than calculating.
Specifically, it is assumed that 3 grades of gearratio i3, odd number shelves base ratio i10,2 grades of gearratio i2, even gear base ratio
The rotating speed of i20, DCT output shaft is Nout, then the rotating speed of the axis (being at this time even number axis) of the non-powered transmission is Nout*
I20*i2, the rotating speed of target Ntarget using this speed as engine, send the signal of the lifting rotating speed of request engine, institute
State the speed that reaches of semaphore request engine rise and be more than Nout*i20*i2, in this way, the rotating speed of even number axis can gradually be lifted with
Reach Nout*i20*i2, so that the rotating speed of synchronizer drive end and driven end approaches, so as to be not easy when synchronizer is into shelves
Produce noise.
Fig. 5 is that a kind of structure for sliding the control device of synchronizer pre-engagement under downshift operating mode in the embodiment of the present invention is shown
It is intended to.Described device 50 can include：Instruction issue unit 51, the first judging unit 52, the control of the first control unit 53, second
Unit 54, the 3rd control unit 55
Instruction issue unit 51, suitable for when speed reaches downshift operating mode pre-engagement speed, sending the synchronization into shelves gear
Device pre-engagement control instruction；
First judging unit 52, suitable on the premise of thering is the synchronizer pre-engagement control instruction into shelves gear to send, sentencing
Whether the speed discrepancy of the axis and the axis of non-powered transmission of disconnected power transmission is greater than or equal to first threshold；
First control unit 53, suitable for when the axis of the power transmission and the speed discrepancy of the axis of non-powered transmission are more than or wait
When the first threshold, corresponding the first set amount of clutch separation of axis of power transmission, the axis of non-powered transmission is corresponding
Clutch combines the second set amount, and engine speed is risen to the first rotating speed to adjust non-powered transmission by request engine
The rotating speed of axis；The value of wherein described first set amount and second set amount and the relative speed variation of the axis of the power transmission
It is negatively correlated；
Second control unit 54, suitable for the speed discrepancy of the axis and the axis of non-powered transmission of power transmission after adjustment
During less than second threshold, request engine stop lifting rotating speed, the corresponding clutch of axis of power transmission is set with reference to described first
Quantify, and the axis of reduction non-powered transmission corresponds to the control pressure of clutch until opening completely；
3rd control unit 55, is less than the 3rd threshold suitable for corresponding to the control pressure of clutch when the axis of the non-powered transmission
Synchronizer is into shelves during value.
In specific implementation, first rotating speed is more than rotating speed of target.
In specific implementation, the rotating speed of target exports rotating speed, into shelves gear gearratio and into shelves gear master according to DCT
Speed reducing ratio, which calculates, to be obtained.
In specific implementation, second control unit 54 is further adapted for：When the axis and the axis of non-powered transmission of power transmission
Speed discrepancy be greater than or equal to first threshold, start timing；When the time that timing obtains exceeding threshold time, engine is asked
Stop lifting rotating speed, the corresponding clutch of axis of power transmission is with reference to first set amount, and reduces the axis of non-powered transmission
The control pressure of corresponding clutch until open completely.
In specific implementation, second control unit 54 is further adapted for：Turn when the rotating speed change rate of power transmission is more than
During fast change rate threshold value, request engine stop lifting rotating speed, the corresponding clutch of axis of power transmission is set with reference to described first
It is quantitative, and reduce the corresponding clutch control pressure of axis of non-powered transmission until opening completely.
In specific implementation, first control unit 51 is further adapted for：When the axis and the axis of non-powered transmission of power transmission
Speed discrepancy be greater than or equal to the relative speed variation of the first threshold and the axis of power transmission and be less than or equal to relative speed variation
During threshold value, corresponding the first set amount of clutch separation of axis of power transmission, the corresponding clutch of axis of non-powered transmission combines
Engine speed is risen to the first rotating speed to adjust the rotating speed of the axis of non-powered transmission by the second set amount, and request engine.
The embodiment of the present invention also provides a kind of TCU, and the TCU can include that above-mentioned to slide synchronizer under downshift operating mode pre-
The control device 50 of engagement.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment is can
To instruct relevant hardware to complete by program, which can be stored in computer-readable recording medium, to store
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, are not departing from this
In the spirit and scope of invention, it can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the scope of restriction.
Claims (13)
- A kind of 1. control method for sliding synchronizer pre-engagement under downshift operating mode, it is characterised in that including：When speed reaches downshift operating mode pre-engagement speed, the synchronizer pre-engagement control instruction into shelves gear is sent；Judge whether the speed discrepancy of the axis of power transmission and the axis of non-powered transmission is greater than or equal to first threshold；When the speed discrepancy of the axis and the axis of non-powered transmission of the power transmission is greater than or equal to the first threshold, power passes Corresponding the first set amount of clutch separation of axis passed, the corresponding clutch of axis of non-powered transmission combine the second set amount, with And engine speed is risen to the first rotating speed to adjust the rotating speed of the axis of non-powered transmission by request engine；Wherein described first sets The value of quantitative and described second set amount and the relative speed variation of the axis of the power transmission are negatively correlated；When the speed discrepancy of the axis and the axis of non-powered transmission of the power transmission after adjustment is less than second threshold, request is started Machine stops lifting rotating speed, and the corresponding clutch of axis of power transmission is with reference to first set amount, and reduces non-powered transmission Axis corresponds to the control pressure of clutch until opening completely；When the control pressure that the axis of the non-powered transmission corresponds to clutch is less than three threshold values, synchronizer is into shelves.
- 2. the control method according to claim 1 for sliding synchronizer pre-engagement under downshift operating mode, it is characterised in that described First rotating speed is more than rotating speed of target.
- 3. the control method according to claim 2 for sliding synchronizer pre-engagement under downshift operating mode, it is characterised in that described Rotating speed of target exports rotating speed according to DCT, calculates acquisition into shelves gear gearratio and into shelves gear base ratio.
- 4. the control method according to claim 1 for sliding synchronizer pre-engagement under downshift operating mode, it is characterised in that also wrap Include：When the speed discrepancy of the axis and the axis of non-powered transmission of power transmission is greater than or equal to first threshold, start timing；When the time that timing obtains exceeding threshold time, request engine stop lifts rotating speed, and the axis of power transmission is corresponding Clutch is with reference to first set amount, and reduces the control pressure of the corresponding clutch of axis of non-powered transmission until beating completely Open.
- 5. the control method according to claim 1 for sliding synchronizer pre-engagement under downshift operating mode, it is characterised in that also wrap Include：When the rotating speed change rate of power transmission is more than relative speed variation threshold value, request engine stop lifting rotating speed, power The corresponding clutch of axis of transmission is with reference to first set amount, and reduces the corresponding clutch control pressure of axis of non-powered transmission Power until open completely.
- 6. the control method according to claim 1 for sliding synchronizer pre-engagement under downshift operating mode, it is characterised in that also wrap Include：When the speed discrepancy of the axis of axis and the non-powered transmission of power transmission is greater than or equal to the first threshold and power transmission When the relative speed variation of axis is less than or equal to relative speed variation threshold value, the corresponding clutch separation of axis first of power transmission is set Amount, the corresponding clutch of axis of non-powered transmission combine the second set amount, and ask engine that engine speed is risen to the One rotating speed is to adjust the rotating speed of the axis of non-powered transmission.
- A kind of 7. control device for sliding synchronizer pre-engagement under downshift operating mode, it is characterised in that including：Instruction issue unit, suitable for when speed reaches downshift operating mode pre-engagement speed, the synchronizer sent into shelves gear is nibbled in advance Close control instruction；First judging unit, suitable on the premise of thering is the synchronizer pre-engagement control instruction into shelves gear to send, judging power Whether the axis of transmission and the speed discrepancy of the axis of non-powered transmission are greater than or equal to first threshold；First control unit, described in being greater than or equal to when the speed discrepancy of the axis of the power transmission and the axis of non-powered transmission During first threshold, corresponding the first set amount of clutch separation of axis of power transmission, the corresponding clutch of axis of non-powered transmission Engine speed is risen into the first rotating speed to adjust turning for the axis of non-powered transmission with reference to the second set amount, and request engine Speed；The value of wherein described first set amount and second set amount and the relative speed variation negative of the axis of the power transmission Close；Second control unit, is less than the suitable for the speed discrepancy of the axis of axis and the non-powered transmission of power transmission after adjustment During two threshold values, request engine stop lifting rotating speed, the corresponding clutch of axis of power transmission with reference to first set amount, and The axis for reducing non-powered transmission corresponds to the control pressure of clutch until opening completely；3rd control unit, it is same when the control pressure of clutch is less than three threshold values suitable for being corresponded to when the axis of the non-powered transmission Device is walked into shelves.
- 8. the control device according to claim 7 for sliding synchronizer pre-engagement under downshift operating mode, it is characterised in that described First rotating speed is more than rotating speed of target.
- 9. the control device according to claim 8 for sliding synchronizer pre-engagement under downshift operating mode, it is characterised in that described Rotating speed of target exports rotating speed according to DCT, calculates acquisition into shelves gear gearratio and into shelves gear base ratio.
- 10. the control device according to claim 7 for sliding synchronizer pre-engagement under downshift operating mode, it is characterised in that institute The second control unit is stated to be further adapted for：When the axis of power transmission and the speed discrepancy of the axis of non-powered transmission are greater than or equal to first threshold, beginning timing；Work as timing When the obtained time exceedes threshold time, request engine stop lifting rotating speed, the corresponding clutch of axis of power transmission combines First set amount, and reduce the control pressure of the corresponding clutch of axis of non-powered transmission until opening completely.
- 11. the control device according to claim 7 for sliding synchronizer pre-engagement under downshift operating mode, it is characterised in that institute The second control unit is stated to be further adapted for：When the rotating speed change rate of power transmission is more than relative speed variation threshold value, request engine stop lifting rotating speed, power The corresponding clutch of axis of transmission is with reference to first set amount, and reduces the corresponding clutch control pressure of axis of non-powered transmission Power until open completely.
- 12. the control device according to claim 7 for sliding synchronizer pre-engagement under downshift operating mode, it is characterised in that institute The first control unit is stated to be further adapted for：When the speed discrepancy of the axis of axis and the non-powered transmission of power transmission is greater than or equal to the first threshold and power transmission When the relative speed variation of axis is less than or equal to relative speed variation threshold value, the corresponding clutch separation of axis first of power transmission is set Amount, the corresponding clutch of axis of non-powered transmission combine the second set amount, and ask engine that engine speed is risen to the One rotating speed is to adjust the rotating speed of the axis of non-powered transmission.
- 13. a kind of TCU, including claim 7-12 any one of them slide the control dress of synchronizer pre-engagement under downshift operating mode Put.
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| CN201510979484.3A CN106907477B (en) | 2015-12-23 | 2015-12-23 | Slide control method, device and the TCU of synchronizer pre-engagement under downshift operating mode |
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| CN201510979484.3A CN106907477B (en) | 2015-12-23 | 2015-12-23 | Slide control method, device and the TCU of synchronizer pre-engagement under downshift operating mode |
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| CN107218385B (en) * | 2017-07-21 | 2019-02-26 | 中国第一汽车股份有限公司 | Slide the power downshift control method in downshift |
| CN109519530B (en) * | 2017-09-19 | 2020-08-04 | 上海汽车集团股份有限公司 | Method and device for controlling synchronizer in double-clutch transmission |
| CN111963678B (en) * | 2019-05-20 | 2022-02-01 | 上海汽车集团股份有限公司 | Method and device for determining shifting fork synchronization point |
| CN111963585B (en) * | 2019-05-20 | 2021-11-09 | 上海汽车集团股份有限公司 | Clutch control method and clutch control system |
| CN112392945B (en) * | 2020-12-07 | 2021-09-28 | 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH1182721A (en) * | 1997-09-05 | 1999-03-26 | Toyota Motor Corp | Shift control device of automatic transmission |
| EP1507103B1 (en) * | 2003-08-14 | 2006-04-05 | Getrag Ford Transmissions GmbH | Method for shifting dual clutches |
| JP2006029476A (en) * | 2004-07-16 | 2006-02-02 | Nissan Motor Co Ltd | Driving force transmitting device |
| JP4945903B2 (en) * | 2005-02-03 | 2012-06-06 | トヨタ自動車株式会社 | transmission |
| JP5292782B2 (en) * | 2007-11-27 | 2013-09-18 | 日産自動車株式会社 | Vehicle shift control device |
| CN104595477B (en) * | 2015-02-04 | 2017-03-08 | 安徽江淮汽车集团股份有限公司 | Two grades of control methods drop in a kind of wet-type dual-clutch change speed gear box positive-torque that is used for |
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