CN107191588B - Consider the big-powered tractor power upshift control method of diesel engine speed regulation characteristic - Google Patents

Consider the big-powered tractor power upshift control method of diesel engine speed regulation characteristic Download PDF

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Publication number
CN107191588B
CN107191588B CN201710533474.6A CN201710533474A CN107191588B CN 107191588 B CN107191588 B CN 107191588B CN 201710533474 A CN201710533474 A CN 201710533474A CN 107191588 B CN107191588 B CN 107191588B
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clutch
pressure
engagement
formula
act
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CN107191588A (en
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夏光
施信信
邹斌
闫瑞琦
郑友
滑杨莹
郭东云
杜克
谢海
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Hefei University of Technology
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Hefei University of Technology
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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
    • F16H61/04—Smoothing ratio shift
    • F16H61/0403—Synchronisation before shifting
    • 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
    • F16H59/50—Inputs being a function of the status of the machine, e.g. position of doors or safety belts
    • F16H59/56—Inputs being a function of the status of the machine, e.g. position of doors or safety belts dependent on signals from the main clutch
    • 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
    • F16H61/26—Generation or transmission of movements for final actuating mechanisms
    • 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
    • F16H61/04—Smoothing ratio shift
    • F16H61/0403—Synchronisation before shifting
    • F16H2061/0407—Synchronisation before shifting by control of clutch in parallel torque path
    • 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
    • F16H61/04—Smoothing ratio shift
    • F16H2061/0459—Smoothing ratio shift using map for shift parameters, e.g. shift time, slip or pressure gradient, for performing controlled shift transition and adapting shift parameters by learning

Abstract

The invention discloses a kind of big-powered tractor power upshift control methods for considering diesel engine speed regulation characteristic, comprising: 1, determine tractor dynamic power upshift control parameter；2, tractor dynamic power upshift control process is divided into shift preparation stage, gear stacking stage, revolving speed synchronous phase and gear strain, to realize that variable ratio drive system during power upshift remains the purpose of biggish output torque, guarantee that diesel engine does not stop working simultaneously, so that tractor is suitable for working resistance variation continuous operation, operating efficiency is ensured.

Description

Consider the big-powered tractor power upshift control method of diesel engine speed regulation characteristic
Technical field
The invention belongs to tractor dynamic power shift control fields, specifically a kind of to drag for Multi-clutch high-power Machine drawing power upshift control method.
Background technique
Tractor work has following characteristics: (1) by agronomy and machine and tool bearing capacity, general uniform motion；(2) in order to Productivity is improved, accelerator open degree is generally 80% or more；(3) working resistance can fluctuate, and traditional manual transmission is difficult to adapt to The variation of working resistance, need to stop shift；For the operating feature of tractor, foreign countries propose that ' (power changes Power Shift ' Gear) transmission system, the tractor cost for configuring this transmission system is also relatively high.The transmission system effectively expands tractor and holds The working resistance range of continuous work avoids conventional manual transmission because of shift of frequently stopping caused by working resistance variation, mentions The high production efficiency of tractor.How to avoid tractor stop during fluid drive because of power interruption be draw it is motor-driven One of the critical issue for needing to solve in power shifting control system R&D process.
So-called power shifting, also known as ' band carries shift ' are to guarantee shift under the premise of meeting certain shift quality requirement The unbroken shift of process power.Power upshift belongs to a part of power shifting technology, during power upshift, needs pair Separation, engagement clutch act pressure rationally control, and since diesel engine is generally operational in speed regulation region, cause when being become larger by load When diesel engine speed declines, diesel engine torque increases, and when diesel engine torque increases, diesel engine speed gos up, if shift control It is unreasonable, it will lead to that power loss is excessive or diesel motor flameout.
During clutch pressure control, it is especially desirable to avoid generating parasitic power, parasitic power is also referred to as following Ring power, the power can also cause very big damage other than causing unnecessary energy loss to transmission system components.
Therefore, big-powered tractor power upshift needs to complete in the loaded state, to guarantee tractor in upshift process In will not stop due to power loss is excessive or because engage clutch act pressure it is excessive due to cause diesel engine excess load flame-out, need Shift clutch is accurately controlled.
Summary of the invention
The present invention considers from application of engineering project, proposes a kind of big-powered tractor power for considering diesel engine speed regulation characteristic Upshift control method to be able to satisfy the requirement of tractor dynamic power upshift, while reducing the complexity of control, so that dilatory Machine can continuous operation, improve productivity and operation quality.
The present invention adopts the following technical scheme that in order to solve the technical problem
The present invention it is a kind of consider diesel engine speed regulation characteristic big-powered tractor power upshift control method the characteristics of be by Following steps carry out:
Step 1, the control parameter for determining tractor dynamic power upshift, comprising: engagement clutch is maintained in the shift preparation stage Pressure pIt is quasi-, engagement clutch act pressure upper limit pIt closes, gear stacking stage engagement with separate clutch pressure increment close System, gear overlapping time tPointWith the pressure rise time t for engaging clutchIt closesIn relationship, the pressure of engagement clutch moment of torque transmitting Limit pEventually；
The process that tractor dynamic power upshift controls is divided by step 2: shift preparation stage, gear stacking stage, revolving speed are same Step section and engagement strain；
In the shift preparation stage, act pressure to the engagement clutch for increasing the engagement clutch is being shifted gears The pressure p that preparation stage maintainsIt is quasi-, so that engagement clutch is in torque transmitting critical state, to eliminate the null of engagement clutch Journey；
In the gear stacking stage, reduce the act pressure for separating clutch to gear stacking stage finish time Corresponding clutch pressure；The act pressure for increasing the engagement clutch simultaneously is overlapped to the separation clutch in gear The act pressure of clutch is engaged corresponding to finish time, so that the actuation of the separation clutch and the engagement clutch Pressure meet gear overlapping engagement with separate clutch pressure increment relation；
In the revolving speed synchronous phase, continue to increase the act pressure for engaging clutch to the engagement clutch Act pressure upper limit pIt closes, and the act pressure of the engagement clutch is kept until the driving and driven disk rotating speed of engagement clutch is same Until step, the pressure of the separation clutch is reduced to 0 in revolving speed synchronous phase start time, and remains unchanged, it is described separate from Clutch separates under action of reset spring；
In the engagement strain, act pressure to the engagement clutch for continuing to increase the engagement clutch is turned round The upper pressure limit p of square transmittingEventuallyUntil.
The characteristics of big-powered tractor power upshift control method of consideration diesel engine speed regulation characteristic of the present invention It is:
The pressure p that the engagement clutch is maintained in the preparation stage is calculated using formula (1)It is quasi-:
In formula (1), FpreFor the pretensioned spring power of the reset spring of the engagement clutch, FfFor piston friction power, Ah For piston effective active area.
The act pressure upper limit p of the engagement clutch is calculated using formula (2)It closes:
In formula (2), q is adjacent two gears transmission ratio ratio；TLFor the torque of the separation clutch transmitting；K is that friction is special Property coefficient is determined by friction plate the piece number, frictional contact surface internal-and external diameter and friction plate material；A is the coefficient greater than 1.
The engagement of gear stacking stage meets formula (3) with clutch pressure increment relation is separated:
In formula (3), Δ pPointFor the pressure increment of the separation clutch, Δ pIt closesPressure for the engagement clutch increases Amount.
The gear overlapping time tPointWith the pressure rise time t for engaging clutchIt closesRelationship meets formula (4):
tPoint=ctIt closes (4)
In formula (4), c is the coefficient less than 1, and c < 1/a, a are the coefficient greater than 1；
The upper pressure limit P of the engagement clutch moment of torque transmitting is calculated using formula (5)Eventually:
pEventually=η pIt closes (5)
In formula (5), η is the coefficient greater than 1.
Compared with the prior art, the beneficial effects of the present invention are embodied in:
1, the present invention by establish during power upshift the separation of gear stacking stage with engage clutch act pressure Increment relation, make gear overlapping time and the oncoming clutch pressure rise time meet certain relationship, and separate, engage Clutch act pressure meets certain pressure increment relationship, so that clutch is positive always to transmit torque, avoids in upshift Generation parasitic power in the process；
2, the present invention determines the work of engagement clutch according to the torque for engaging clutch transmitting during power upshift The dynamic pressure upper limit has fully considered the governor control characteristics of diesel engine, avoids and leads because engagement clutch act pressure is excessive Diesel engine excess load is caused, thus it is flame-out, it ensure that operation quality；
3, it is more corresponding than its transmitting torque that the clutch act pressure upper limit is engaged during the power upshift of the invention by setting Clutch pressure it is big, to reduce shift time, reduce work of slipping loss, improve the power utilization of engine；
4, power upshift control method of the invention does not need to carry out the coordinated control of engine, and control is relatively easy, together When can satisfy tractor dynamic power shift requirement, avoid tractor parking upshift, enable tractor continuous operation, improve The productivity and operation quality of tractor.
Detailed description of the invention
Fig. 1 be separation of the invention with engage clutch act pressure schematic diagram；
Fig. 2 is the power transmission line schematic diagram of power-shift transmission of the invention；
Fig. 3 is output torque change curve during upshift of the invention；
Fig. 4 is input and output rotation speed change curve during upshift of the invention；
Fig. 5 is clutch state change curve of the invention.
Specific embodiment
In the present embodiment, a kind of big-powered tractor power upshift control method considering diesel engine speed regulation characteristic can not By the coordination feedback control to diesel engine, the power upshift of big-powered tractor is only realized by the control to shift clutch Control, and is able to satisfy the job requirements of tractor dynamic power upshift, enables tractor continuous operation, improves operation quality and life Yield, while the complexity of control is reduced, engineer application is stronger.
Since diesel engine is generally operational in speed regulation region, when being become larger by load causes diesel engine speed to decline, diesel engine Torque increases, and when diesel engine torque increases, diesel engine speed gos up.Therefore, diesel engine can be in speed regulation region energy steady operation.? Non- speed regulation region, when loading increase, diesel engine speed decline, diesel engine speed decline further causes diesel engine output to turn Square decline, it is flame-out to eventually lead to diesel engine, therefore diesel engine will avoid in non-speed regulation region.A kind of consideration diesel engine of the invention The big-powered tractor power upshift control method of governor control characteristics, by clutch act pressure during power upshift Control realizes that power does not interrupt, and avoids diesel engine and stop working during power upshift.
- Fig. 5 refering to fig. 1 is specifically to carry out as follows:
Step 1, when power upshift starts, it is first determined the control parameter of power upshift, according to control parameter determination connect Then the act pressure change curve of the luxuriant clutch of splitting or integrating completes power upshift, it is thus necessary to determine that the control of tractor dynamic power upshift Parameter includes: the pressure p for engaging clutch and maintaining in the shift preparation stageIt is quasi-, engagement clutch act pressure upper limit pIt closes, gear The engagement of stacking stage with separate clutch pressure increment relation, gear overlapping time tPointWhen rising with the pressure for engaging clutch Between tIt closesThe upper pressure limit p that relationship, engagement clutch moment of torque transmitEventually；
The calculation basis of the control parameter of tractor dynamic power upshift is illustrated below, as follows:
Since engagement clutch eliminates the pre-compression force and piston friction power that idle stroke needs to overcome reset spring, engagement The pressure p that clutch is maintained in the preparation stageIt is quasi-It is calculated using formula (1):
In formula (1), FpreFor the pretensioned spring power of the reset spring of the engagement clutch, FfFor piston friction power, Ah For piston effective active area.
When clutch rubs state in cunning, clutch transmission torque size is directly proportional to its act pressure, in order to avoid Clutch act pressure is excessive leads to diesel engine excess load for engagement, engages the act pressure upper limit p of clutchIt closesIt is counted using formula (2) It calculates:
In formula (2), q is adjacent two gears transmission ratio ratio；TLFor the torque of the separation clutch transmitting；K is that friction is special Property coefficient is determined by friction plate the piece number, frictional contact surface internal-and external diameter and friction plate material；A is the coefficient greater than 1, the value model of a It encloses and be easy to cause diesel engine to work overloadingly if the value of a is excessive for [1.1,1.2]；Conversely, then shift time is longer, from Clutch serious wear, power loss are excessive.
The calculating of frictional behavior coefficient k carries out in accordance with the following methods:
1, when clutch is dry clutch, frictional behavior coefficient k is calculated using formula (3):
In formula (3), μ, S, Z, R0、R1Respectively clutch friction coefficient, contact area, friction plate the piece number, friction plate outer diameter And internal diameter.
2, when clutch is wet clutch, frictional behavior coefficient k can be obtained by platform experiment, specifically according to following Experimental method carries out:
Wet clutch is accessed into clutch test stand, the output end of testing stand accesses load, the act pressure of clutch FsendWith load torque TloadIt is provided by electric hydraulic oil pump, it is Δ F that defining clutch act pressure, which adjusts step pitch,send, load It is Δ T that torque, which adjusts step pitch,load。
(1) apply clutch act pressure Fsend=Δ Fsend, and remain unchanged, while applying load torque is Δ Tload, And constantly adjustment load torque size until clutch starts, rub and the driven end uniform motion of clutch, record apply instantly by cunning Load torque size delta Tload1, save clutch act pressure Fsend=Δ FsendWith load torque Tload=Δ Tload1；
(2) step pitch Δ F is adjusted with clutch act pressuresendIncrease the act pressure F for adding clutchsend=2 Δ Fsend, And it remains unchanged, while applying load torque is Δ Tload, and constantly adjustment load torque size is until clutch starts cunning and rubs And the driven end uniform motion of clutch, record the load torque size delta T applied instantlyload2, save clutch act pressure Fsend=2 Δ FsendWith load torque Tload=Δ Tload1；
(3) above-mentioned test procedure is repeated, the act pressure for obtaining clutch is transmitted the scatter plot of torque with it, then used The act pressure of linear fit method fitting clutch transmits torque curve with it, and frictional behavior coefficient k can be obtained.
It being lost to reduce unnecessary sliding abrasion, separation clutch keeps bonding state in gear stacking stage, although point Clutch is still in engagement state, but divides because engagement clutch starts transmitting torque if total output torque is substantially constant It is gradually reduced from clutch transmission torque, power is gradually transitioned into engagement clutch from separation clutch, then gear stacking stage Engagement meet formula (4) with clutch pressure increment relation is separated:
In formula (4), Δ pPointFor the pressure increment for separating clutch, Δ pIt closesFor the pressure increment for engaging clutch.
In order to avoid the generation of parasitic power, gear overlapping time tPointWith the pressure rise time t for engaging clutchIt closesRelationship Meet formula (5):
tPoint=ctIt closes (5)
In formula (5), c is the coefficient less than 1, and c < 1/a, a are the coefficient greater than 1；
The value range of c is [0.6,0.9], if the value of c is too small, power loss is excessive；It is posted conversely, being then easy to produce Raw power.
Engage the upper pressure limit p of clutch moment of torque transmittingEventually；
pEventually=η pIt closes (6)
In formula (6), η is the coefficient greater than 1.
The value of η is depending on the fluctuation range of clutch transmission torque size, and value range is [1.1,1.5], if η Value it is excessive, then be easy to cause hydraulic pipeline leakage；Conversely, then easily causing engagement slipping of clutch.
The process that tractor dynamic power upshift controls is divided by step 2: shift preparation stage, gear stacking stage, revolving speed are same Step section and engagement strain, refering to fig. 1, specifically:
In the shift preparation stage, i.e. t1~t2Stage, act pressure to the engagement clutch for increasing engagement clutch are being shifted gears The pressure p that preparation stage maintainsIt is quasi-, so that engagement clutch is in torque transmitting critical state, to eliminate the null of engagement clutch Journey, the pressure p that engagement clutch is maintained in the preparation stageIt is quasi-It is calculated using formula (1), separates clutch at this stage and keep pressure It is constant, it is in engagement state；
In gear stacking stage, i.e. t2~tPointStage reduces the act pressure of separation clutch to gear stacking stage knot Clutch pressure corresponding to the beam moment；The act pressure for increasing engagement clutch simultaneously, which is overlapped to separation clutch in gear, to be tied The act pressure of clutch is engaged corresponding to the beam moment, so that the act pressure of separation clutch and engagement clutch meets gear The engagement of position overlapping with separate clutch pressure increment relation, engage clutch with separate the pressure increment relationship of clutch by formula (4) it calculates, the torque capacity which separates clutch is greater than the torque of its transmitting, is in bonding state, unnecessary to reduce Cunning abrasion lose, oncoming clutch pressure gradually rises at this stage so that transmitting torque gradually from separation clutch transition It to engagement clutch, is completed the moment in gear stacking stage, completely release separation clutch pressure pDivide 1To 0, posted to avoid generation Raw power, the act pressure for engaging clutch at this time is pDivide 3。
In revolving speed synchronous phase, i.e. tPoint~tEventuallyStage, in tPoint~tIt closesStage continues to increase the act pressure of engagement clutch pDivide 3To the act pressure upper limit p of engagement clutchIt closes, and in tIt closes~tEventuallyStage remains engaged with the act pressure of clutch until connecing Until the driving and driven disk rotating speed of conjunction clutch is synchronous, the pressure for separating clutch is reduced to 0 in revolving speed synchronous phase start time, And remain unchanged, separation clutch separates under action of reset spring.
In revolving speed synchronous phase, engages the clutch act pressure upper limit and determined according to the size of transmitting torque；Engage clutch The device act pressure upper limit is bigger, shorter the time required to revolving speed is synchronous, and sliding abrasion mistake is fewer, but if excessive, is easy to cause diesel oil Engine stops working because of excess load, and the engagement clutch act pressure upper limit is calculated by formula (2).
In engagement strain, i.e. tEventually~t3Stage, the act pressure for continuing to increase the engagement clutch connect to described Close the upper pressure limit p of clutch moment of torque transmittingEventuallyUntil, so that it keeps bonding state to have certain nargin, avoid due to transmitting Torque ripple and cause its cunning to be rubbed.
Embodiment: the present embodiment is using tractor upshift control method of the invention to certain model big-powered tractor power Gear shift transmission carries out 3 gears and rises 4 gear controls.
Referring to Fig.2, C1、C2、C3And C4Respectively shift clutch, as clutch C1、C4Engagement, clutch C2、C3Separation When, power-shift transmission gear is 3 gears；As clutch C1、C2Separation, clutch C3、C4When engagement, power-shift transmission Gear is 4 gears；When transmission gear rises 4 gear from 3 gears, clutch C1Become discrete state, clutch C from engagement state3From point From state is become as engagement state, power flow is gradually from clutch C1It is transitioned into clutch C3；
Big-powered tractor power system parameter is as follows: the peak torque of clutch transmitting is 380N.m；Engine is bavin Oil turbine, rated power 100kw, accelerator open degree 80%；K is 0.098N.m/pa, q 1.2；A is 1.1；Clutch C3Make The dynamic pressure rise time is 0.5s, clutch C1Pressure drop rate is 6400pa/s, and it is 0.4s that power, which joins phases-time,.
Fig. 3 is clutch state change curve, wherein 1 indicates clutch C1In conjunction with, clutch C3Cunning is rubbed；2 indicate clutch C1It is sliding rub, clutch C3Cunning is rubbed；3 indicate clutch C1It is sliding rub, clutch C3In conjunction with；Fig. 4 is output torque change curve；Fig. 5 is Input and output shaft rotation speed change curve, wherein ωeFor input shaft rotating speed, ωvFor output shaft revolving speed.
It is gear stacking stage in 10~10.4s refering to Fig. 3, separates clutch at this stage and keep bonding state, engagement Clutch slipping consumes Partial Power, the output rotational speed omega of output torque and Fig. 5 refering to Fig. 4vCurve, the stage output torque Declined with output shaft revolving speed；It is revolving speed synchronous phase, at this stage clutch C in 10.4~10.8s1It is sliding rub, clutch C3 Cunning is rubbed；Refering to the output torque curve of Fig. 4, the stage output torque is bigger than the load torque that clutch transmits, and is conducive to shorten Revolving speed synchronization time；Refering to Fig. 5 morning input speed ωeCurve, since engine load is bigger, diesel engine at this stage Machine revolving speed suppression ratio is very fast, but without departing from the speed adjustable range of diesel engine；The clutch C after 10.8s3In conjunction with, from Clutch C1Separation, so far, entire power upshift process are completed, and big-powered tractor power-shift transmission rises up into 4 gears in 3 gears Power drive system remains in the process gos up after biggish power output, speed are slightly declined, not because in power Break and be reduced to 0, realizes smooth shift, ensure that tractor continuous operation.

Claims (1)

1. a kind of big-powered tractor power upshift control method for considering diesel engine speed regulation characteristic, it is characterised in that by following step It is rapid to carry out:
Step 1, the control parameter for determining tractor dynamic power upshift, comprising: the pressure that engagement clutch is maintained in the shift preparation stage Power pIt is quasi-, engagement clutch act pressure upper limit pIt closes, gear stacking stage engagement with separate clutch pressure increment relation, gear Position overlapping time tPointWith the pressure rise time t for engaging clutchIt closesThe upper pressure limit p that relationship, engagement clutch moment of torque transmitEventually；
The pressure p that the engagement clutch is maintained in the preparation stage is calculated using formula (1)It is quasi-:
In formula (1), FpreFor the pretensioned spring power of the reset spring of the engagement clutch, FfFor piston friction power, AhFor work Fill in effective active area；
The act pressure upper limit p of the engagement clutch is calculated using formula (2)It closes:
In formula (2), q is adjacent two gears transmission ratio ratio；TLFor the torque of the separation clutch transmitting；K is frictional behavior system Number, is determined by friction plate the piece number, frictional contact surface internal-and external diameter and friction plate material；A is the coefficient greater than 1；
The engagement of gear stacking stage meets formula (3) with clutch pressure increment relation is separated:
In formula (3), Δ pPointFor the pressure increment of the separation clutch, Δ pIt closesFor the pressure increment of the engagement clutch；
The gear overlapping time tPointWith the pressure rise time t for engaging clutchIt closesRelationship meets formula (4):
tPoint=ctIt closes (4)
In formula (4), c is the coefficient less than 1, and c < 1/a, a are the coefficient greater than 1；
The upper pressure limit P of the engagement clutch moment of torque transmitting is calculated using formula (5)Eventually:
pEventually=η pIt closes (5)
In formula (5), η is the coefficient greater than 1；
The process that tractor dynamic power upshift controls is divided by step 2: the shift preparation stage, gear stacking stage, the same step of revolving speed Section and engagement strain；
In the shift preparation stage, the act pressure for increasing the engagement clutch prepares to the engagement clutch in shift The pressure p that stage maintainsIt is quasi-, so that engagement clutch is in torque transmitting critical state, to eliminate the idle stroke of engagement clutch；
In the gear stacking stage, the act pressure for reducing the separation clutch is right to gear stacking stage finish time institute The clutch pressure answered；The act pressure for increasing the engagement clutch simultaneously terminates to the separation clutch in gear overlapping The act pressure of clutch is engaged corresponding to moment, so that the act pressure of the separation clutch and the engagement clutch Meet gear overlapping engagement with separate clutch pressure increment relation；
In the revolving speed synchronous phase, continue to increase the act pressure of the engagement clutch to the actuation of the engagement clutch Upper pressure limit pIt closes, and the act pressure of the engagement clutch is kept until the driving and driven disk rotating speed of engagement clutch synchronizes and is Only, the pressure of the separation clutch is reduced to 0 in revolving speed synchronous phase start time, and remains unchanged, the separation clutch It is separated under action of reset spring；
In the engagement strain, act pressure to the engagement clutch moment of torque for continuing to increase the engagement clutch is passed The upper pressure limit p passedEventuallyUntil.
CN201710533474.6A 2017-07-03 2017-07-03 Consider the big-powered tractor power upshift control method of diesel engine speed regulation characteristic Active CN107191588B (en)

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CN112324906A (en) * 2020-11-09 2021-02-05 江苏悦达智能农业装备有限公司 Vehicle transmission system and clutch switching control method thereof
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纯电动客车三挡行星传动自动变速系统关键技术研究;齐国巍;《中国优秀硕士学位论文电子期刊网》;20150831;正文第46-49页

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