CN110375011A - A kind of control method avoiding power-shift transmission upshift power cycle - Google Patents

A kind of control method avoiding power-shift transmission upshift power cycle Download PDF

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Publication number
CN110375011A
CN110375011A CN201910673285.8A CN201910673285A CN110375011A CN 110375011 A CN110375011 A CN 110375011A CN 201910673285 A CN201910673285 A CN 201910673285A CN 110375011 A CN110375011 A CN 110375011A
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China
Prior art keywords
power
clutch
oil pressure
upshift
gear
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CN201910673285.8A
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Chinese (zh)
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CN110375011B (en
Inventor
夏光
张亮
石鹏
许立平
赵名卓
张洋
高军
杨猛
李嘉诚
纵华宇
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合肥工业大学
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Priority to CN201910673285.8A priority Critical patent/CN110375011B/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D48/00External control of clutches
    • F16D48/06Control by electric or electronic means, e.g. of fluid pressure
    • F16D48/066Control of fluid pressure, e.g. using an accumulator

Abstract

The invention discloses a kind of control methods of power-shift transmission upshift, it is intended to avoid the vehicle for carrying power-shift transmission emergent power circulation and deceleration phenomenon in upshift, it is taken in shift process and only controls a clutch in sliding state of rubbing, another clutch is only in combination or discrete state, with this under the conditions of equally realizing that power is unbroken, so that the control of power shifting process is easier to be accurate, the power cycle phenomenon occurred in power upshift control process is can simultaneously be effectively avoided.

Description

A kind of control method avoiding power-shift transmission upshift power cycle

Technical field

The present invention relates to a kind of control methods of power-shift transmission upshift, it is intended to realize and carry power upshift speed changer Vehicle avoid the occurrence of power cycle and deceleration phenomenon while power upshift.

Background technique

Power-shift transmission is widely used in engineering truck and agri-vehicle, becomes in used mechanical changeover before Fast device causes vehicle operation gear to working rig due to that must interrupt engine power by separation main clutch in shift process Response lag, the operation quality of group working resistance variation fluctuate, while being also unfavorable for giving full play to effective engine power, Affect the production efficiency of vehicle and Complete working unit.Power-shift transmission based on double clutch, not only in power shifting mistake The obvious power interruption phenomenon of Cheng Zhongwu also has many characteristics, such as that shift response is fast, has obtained widely promoting the use of.

It is commonly used in several schemes currently based on the control strategy of double-clutch power gear shift transmission, after clutch first divides There are longer power interruption processes for conjunction scheme, are unsatisfactory for the unbroken requirement of power shifting process power;And clutch is double sliding The scheme of rubbing is to be rubbed, realized by cunning while two clutches of control using a kind of relatively broad shift control strategy at present Power does not interrupt, but the shift control strategy of this form is not only needed simultaneously in shift process to the oil pressure of two clutches Accurately controlled, it is also contemplated that due in shift process oil pressure cntrol it is unreasonable and generate power cycle phenomenon.

Summary of the invention

The present invention is to make up above-mentioned existing deficiencies in the technology, proposes that one kind avoids power-shift transmission liter Keep off power cycle control method, to by control clutch pressure and engine output power, realize upshift during Power do not interrupt and avoid the occurrence of power cycle problem.

The present invention to achieve the above object of the invention, adopts the following technical scheme that

A kind of the characteristics of control method avoiding power-shift transmission upshift power cycle of the invention is as follows It carries out:

Step 1, under conditions of low range clutch oil pressure remains unchanged, increase high gear clutch on oil pressure, make its gram It takes idle stroke and enters the torque transfer stage;

Step 2, in the torque transfer stage, reduce oil pressure to the critical cunning on low range clutch and rub oil pressure, while not The disconnected oil pressure increased on high gear clutch makes it do sliding rub and moves and in sliding state of rubbing;

It rubs in state in the cunning, improves the output power of engine, to compensate the unit friction work loss of high gear clutch, and The oil pressure of the low range clutch still maintains constant;

When step 3, oil pressure at the end of the oil pressure of high gear clutch reaches the torque transfer stage, quickly reduce described low The oil pressure for keeping off clutch is 0, and the low range clutch is made to be in discrete state, while controlling turning for the high gear clutch transmitting Square is equal to the moment of resistance to avoid power cycle phenomenon is generated;

Step 4 continues to increase the oil pressure of the high gear clutch, so that the revolving speed of the master and slave movable plate of clutch reaches phase Meanwhile the high gear clutch becomes bonding state from the sliding state of rubbing, to complete power upshift;

Step 5 is completed the moment in power upshift, and the oil pressure of control high gear clutch rises to, to increase high gear clutch In conjunction with nargin, while reducing the output power of engine.

A kind of the characteristics of control method avoiding power-shift transmission upshift power cycle of the present invention, lies also in,

In the step 1 and step 2, oil pressure when low range clutch is remained unchanged is that low range clutch keeps synchronous knot The locking oil pressure p of resultant motion6, and obtained by formula (1):

In formula (1): iLFor the transmission ratio of low gear before upshift;kLFor the ratio of low range clutch static friction torque before upshift Coefficient, TLThe torque transmitted for low gear before upshift.

Oil pressure p in the step 3, at the end of the torque handover stage2It is to be obtained by formula (2):

In formula (2): iLFor the transmission ratio of low gear before upshift, iHFor the transmission ratio of high gear after upshift, kHIt is high after upshift Keep off the proportionality coefficient of static friction of clutch torque, TLThe torque transmitted for low gear before upshift.

The critical cunning oil pressure that rubs is determining according to the following procedure in the step 2:

Step a, input speed is n when setting the transmission of power-shift transmission low gear1, output revolving speed is n2, then low gear Have when transmission

Low range clutch oil pressure is p when low gear being enabled to be driven6, the unit change difference of experimental test clutch pressure is Δ P, then the m times reduction low range clutch oil pressure value is p6-m·Δp;

Step b, control power-shift transmission input speed is n1It remains unchanged, when the m times reduction low range clutch oil Pressure value is p6When-m Δ p, it is n that power-shift transmission, which exports revolving speed,2It remains unchanged;When the m+1 times reduction low range clutch oil Pressure value is p6When (m+1) Δ p, it is not n that power-shift transmission, which exports revolving speed,2;When the m+2 times reduction low range clutch oil pressure Value is p6When (m+2) Δ p, it is not also n that power-shift transmission, which exports revolving speed,2, then the m times reduction low range clutch oil pressure value p6- m Δ p is that the critical cunning of low range clutch is rubbed oil pressure.

In the step 2, the improved output power of engine to PBIt is to be obtained by formula (3):

PB=PA+PS (3)

In formula (3), PAFor the output power of upshift front engine, PSIt is high gear clutch at the end of torque synchronous phase The sliding wasted power that rubs, and obtained by formula (4):

In formula (4): iLFor the transmission ratio of low gear before upshift, iHFor the transmission ratio after upshift when high gear, PABefore upshift The output power of engine.

The output power P that engine described in the step 5 is reducedCFor the resistance power P of tractorfWith engine Stand-by power PbThe sum of.

Compared with the prior art, the invention has the advantages that:

1, power-shift transmission of the present invention controls a clutch and is in sliding state of rubbing during upshift, another Clutch is only in combination or discrete state, so that the control of power shifting process is easier to be accurate.

2, power-shift transmission of the present invention is during upshift, by controlling the oil pressure of clutch, and in high gear clutch Engine output is improved in device pressurization, the unit friction work loss of clutch is compensated, realizes that power does not interrupt upshift process.

3, the present invention is separated by controlling the state of high and low gear clutch and the torque of transmitting at low range clutch When high gear clutch slipping, the torque of control high gear clutch transmitting is equal to the moment of resistance, can be effectively prevented from due to being widely used The power cycle phenomenons that occur during upshift of double sliding power shifting control programs of rubbing.

Detailed description of the invention

Fig. 1 is power shifting section kinetic model figure of the present invention;

Fig. 2 is power upshift high to low gear clutch pressure control law figure of the present invention;

Fig. 3 is power upshift engine output control law figure of the present invention.

Specific embodiment

In the present embodiment, a kind of control method avoiding power-shift transmission upshift power cycle, in shift process It takes and only controls a clutch in the presence of sliding state of rubbing, another clutch only exists combination or discrete state, with this same Under the conditions of realizing that power is unbroken, so that the control of power shifting process is easier to be accurate, can simultaneously be effectively avoid Double cunnings are rubbed the power cycle phenomenon that scheme occurs in power upshift control process.Specifically, refering to fig. 1, it is kept off with L and rises H gear For, it is carried out in conjunction with Fig. 2 and Fig. 3, and as follows:

Oil pressure keeps p in step 1, low range clutch A6It is constant, increase the oil pressure on high gear clutch B to p1, make high gear from Clutch B overcomes idle stroke and enters the torque transfer stage;

Oil pressure when low range clutch A is remained unchanged is known as low range clutch A and keeps the synchronous locking oil for combining movement Press p6, and obtained by formula (1):

In formula (1): iLFor the transmission ratio of L gear;kAFor the proportionality coefficient of static friction torque on low range clutch A, TAFor clutch The torque transmitted on device A.

Step 2, in the torque transfer stage, reduce oil pressure to the critical cunning on low range clutch A and rub oil pressure p5, while constantly Increase the oil pressure on high gear clutch B, so that it is done sliding rub and move and in sliding state of rubbing;

Wherein, the critical cunning oil pressure that rubs is determining according to the following procedure:

Step a, input speed is n when setting the transmission of power-shift transmission low gear1, output revolving speed is n2, then low gear Have when transmission

Low range clutch oil pressure is p when low gear being enabled to be driven6, the unit change difference of experimental test clutch pressure is Δ P, then the m times reduction low range clutch oil pressure value is p6-m·Δp;

Step b, control power-shift transmission input speed is n1It remains unchanged, when the m times reduction low range clutch oil Pressure value is p6When-m Δ p, it is n that power-shift transmission, which exports revolving speed,2It remains unchanged;When the m+1 times reduction low range clutch oil Pressure value is p6When (m+1) Δ p, it is not n that power-shift transmission, which exports revolving speed,2;When the m+2 times reduction low range clutch oil pressure Value is p6When (m+2) Δ p, it is not also n that power-shift transmission, which exports revolving speed,2, then the m times reduction low range clutch oil pressure value p6- m Δ p is that the critical cunning of low range clutch is rubbed oil pressure.

In sliding state of rubbing, the output power of engine is improved by PATo PB, to compensate the unit friction work on high gear clutch B Loss, and the oil pressure on low range clutch A still maintains as p5

The output power P that engine is improved is obtained by formula (2)B:

PB=PA+PS (2)

In formula (2), PAFor the output power of upshift front engine, PSIt is high gear clutch at the end of torque synchronous phase The sliding wasted power that rubs, and obtained by formula (3):

In formula (3): iLFor the transmission ratio of L gear, iHFor the transmission ratio of H gear, PAFor the output power of upshift front engine;

Step 3, the oil pressure p at the end of the oil pressure on high gear clutch B reaches the torque handover stage2When, quickly reduce Oil pressure on low range clutch A is 0, low range clutch A is made to be in discrete state, while controlling and transmitting on high gear clutch B Torque is equal to the moment of resistance to avoid power cycle phenomenon is generated;

Wherein, the oil pressure p at the end of the torque handover stage2It is to be obtained by formula (4):

In formula (4): iLFor the transmission ratio of L gear, iHFor the transmission ratio of H gear, kBFor static friction torque on high gear clutch B Proportionality coefficient, TATo keep out the torque transmitted on clutch A.

At the end of the torque handover stage, there is the relational expression as shown in formula (5):

Continue to increase the oil pressure on high gear clutch B in the revolving speed handover stage, there is the relational expression as shown in formula (6):

I.e. revolving speed handover stage control high gear clutch B continues growing oil pressure, the output torque T of speed changeroutConstantly increase Greatly, rotational speed omega is exportedvIt is continuously increased, tractor is not compromised by the separation of low range clutch A and power interruption occurs or subtract Fast phenomenon.

In formula (5) and (6): iL、iHThe transmission ratio of respectively L gear, H gear, TA、TBTransmitting on respectively clutch A, B turns Square, ToutFor the output torque of speed changer.

Step 4 continues to increase oil pressure on high gear clutch B to p3, so that master and slave movable plate on high gear clutch B When revolving speed reaches identical, high gear clutch B becomes bonding state from the sliding state of rubbing, to complete power upshift;

Step 5 completes the moment in power upshift, controls the oil pressure on high gear clutch B by p3Rise to p4, to increase height The combination nargin on clutch B is kept off, while reducing the output power of engine to PC

Wherein, engine reduces output power to PCIt is to be obtained by formula (7):

PC=Pf+Pb (7)

In formula (7): PfFor the resistance power of tractor, PbThe stand-by power of engine.

Claims (6)

1. a kind of control method for avoiding power-shift transmission upshift power cycle, it is characterized in that carrying out as follows:
Step 1, under conditions of low range clutch oil pressure remains unchanged, increase high gear clutch on oil pressure, so that it is overcome sky Stroke simultaneously enters the torque transfer stage;
Step 2, in the torque transfer stage, reduce oil pressure to the critical cunning on low range clutch and rub oil pressure, while constantly increasing Oil pressure on big high gear clutch makes it do sliding rub and moves and in sliding state of rubbing;
It rubs in state in the cunning, improves the output power of engine, to compensate the unit friction work loss of high gear clutch, and it is described The oil pressure of low range clutch still maintains constant;
When step 3, oil pressure at the end of the oil pressure of high gear clutch reaches the torque transfer stage, quickly reduce the low gear from The oil pressure of clutch is 0, and the low range clutch is made to be in discrete state, while controlling the torque etc. of the high gear clutch transmitting In the moment of resistance to avoid generation power cycle phenomenon;
Step 4 continues to increase the oil pressure of the high gear clutch, when so that the revolving speed of the master and slave movable plate of clutch reaching identical, The high gear clutch becomes bonding state from the sliding state of rubbing, to complete power upshift;
Step 5 is completed the moment in power upshift, and the oil pressure of control high gear clutch rises to, to increase the combination of high gear clutch Nargin, while reducing the output power of engine.
2. a kind of control method for avoiding power-shift transmission upshift power cycle, feature exist according to claim 1 In in the step 1 and step 2, oil pressure when low range clutch is remained unchanged is that low range clutch keeps synchronous combine to transport Dynamic locking oil pressure p6, and obtained by formula (1):
In formula (1): iLFor the transmission ratio of low gear before upshift;kLFor the proportionality coefficient of low range clutch static friction torque before upshift, TLThe torque transmitted for low gear before upshift.
3. a kind of control method for avoiding power-shift transmission upshift power cycle, feature exist according to claim 1 In oil pressure p in the step 3, at the end of the torque handover stage2It is to be obtained by formula (2):
In formula (2): iLFor the transmission ratio of low gear before upshift, iHFor the transmission ratio of high gear after upshift, kHFor high gear after upshift from The proportionality coefficient of clutch static friction torque, TLThe torque transmitted for low gear before upshift.
4. a kind of control method for avoiding power-shift transmission upshift power cycle, feature exist according to claim 1 In the critical cunning oil pressure that rubs is determining according to the following procedure in the step 2:
Step a, input speed is n when setting the transmission of power-shift transmission low gear1, output revolving speed is n2, then low gear is driven Shi You
Low range clutch oil pressure is p when low gear being enabled to be driven6, the unit change difference of experimental test clutch pressure is Δ p, then The m times reduction low range clutch oil pressure value is p6-m·Δp;
Step b, control power-shift transmission input speed is n1It remains unchanged, when the m times reduction low range clutch oil pressure value is p6When-m Δ p, it is n that power-shift transmission, which exports revolving speed,2It remains unchanged;When the m+1 times reduction low range clutch oil pressure value is p6When (m+1) Δ p, it is not n that power-shift transmission, which exports revolving speed,2;When the m+2 times reduction low range clutch oil pressure value is p6When (m+2) Δ p, it is not also n that power-shift transmission, which exports revolving speed,2, then the m times reduction low range clutch oil pressure value p6- M Δ p is that the critical cunning of low range clutch is rubbed oil pressure.
5. a kind of control method for avoiding power-shift transmission upshift power cycle, feature exist according to claim 1 In, in the step 2, the improved output power of engine to PBIt is to be obtained by formula (3):
PB=PA+PS (3)
In formula (3), PAFor the output power of upshift front engine, PSFor high gear clutch, cunning is rubbed at the end of torque synchronous phase Wasted power, and obtained by formula (4):
In formula (4): iLFor the transmission ratio of low gear before upshift, iHFor the transmission ratio after upshift when high gear, PATo start before upshift The output power of machine.
6. a kind of control method for avoiding power-shift transmission upshift power cycle, feature exist according to claim 1 In the output power P that engine described in the step 5 is reducedCFor the resistance power P of tractorfWith the standby function of engine Rate PbThe sum of.
CN201910673285.8A 2019-07-24 2019-07-24 Control method for avoiding power-shifting transmission gear-up power circulation CN110375011B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102278465A (en) * 2011-05-20 2011-12-14 北京理工大学 Method for calibrating control parameters during gear shifting process
JP2012241888A (en) * 2011-05-24 2012-12-10 Suzuki Motor Corp Control apparatus for twin-clutch automatic transmission
CN103671898A (en) * 2013-12-25 2014-03-26 盛瑞传动股份有限公司 Gear-shifting control method for automatic hydraulic speed changer
CN105485323A (en) * 2014-09-19 2016-04-13 西安双特智能传动有限公司 Automatic transmission and gear shifting control method thereof
CN106931157A (en) * 2017-03-13 2017-07-07 合肥工业大学 A kind of double-clutch speed changer shift control method for avoiding dual-clutch gear-shifting power cycle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102278465A (en) * 2011-05-20 2011-12-14 北京理工大学 Method for calibrating control parameters during gear shifting process
JP2012241888A (en) * 2011-05-24 2012-12-10 Suzuki Motor Corp Control apparatus for twin-clutch automatic transmission
CN103671898A (en) * 2013-12-25 2014-03-26 盛瑞传动股份有限公司 Gear-shifting control method for automatic hydraulic speed changer
CN105485323A (en) * 2014-09-19 2016-04-13 西安双特智能传动有限公司 Automatic transmission and gear shifting control method thereof
CN106931157A (en) * 2017-03-13 2017-07-07 合肥工业大学 A kind of double-clutch speed changer shift control method for avoiding dual-clutch gear-shifting power cycle

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