CN104316316B - Testing method and system of speed changer - Google Patents

Testing method and system of speed changer Download PDF

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Publication number
CN104316316B
CN104316316B CN201410408692.3A CN201410408692A CN104316316B CN 104316316 B CN104316316 B CN 104316316B CN 201410408692 A CN201410408692 A CN 201410408692A CN 104316316 B CN104316316 B CN 104316316B
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China
Prior art keywords
clutch
pressure
current
electromagnetic valve
torque
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CN201410408692.3A
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Chinese (zh)
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CN104316316A (en
Inventor
郭伟
戴振坤
王书翰
鲁曦
范维栋
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盛瑞传动股份有限公司
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Priority to CN201410408692.3A priority Critical patent/CN104316316B/en
Publication of CN104316316A publication Critical patent/CN104316316A/en
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Publication of CN104316316B publication Critical patent/CN104316316B/en

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Abstract

The application discloses a testing method and system of a speed changer. The method is characterized in that an input torque of a testing motor and a speed changer structure parameter are obtained; a torque of a clutch is obtained by calculated according to the input torque of the testing motor and the speed changer structure parameter; a pressure signal of the clutch is obtained according to a pressure sensor at a pressure measuring port of the speed changer and a control current signal of the speed changer is obtained based on CAN communication, and a torque-pressure characteristic parameter, a pressure current characteristic parameter, and an oil charge characteristic parameter of the speed changer are obtained by calculation based on the signals; calculation is carried out to obtain a target current signal of a solenoid valve according to the characteristic parameters of the speed changer and the control torque of the clutch; and the opening degree of the solenoid valve is controlled based on the target current signal. Therefore, the clutch pressure is adjusted, thereby achieving an objective of reduction of a workload during the shifting quality improvement process.

Description

A kind of variator method of testing and system

Technical field

The application is related to transmission control technical field, more particularly, it relates to a kind of variator method of testing and system.

Background technology

Transmission system in automobile driving system is made up of mechanical part, hydraulic part and electric control part, in automobile life Produce in manufacture process it will usually described transmission system is carried out with eol detection (end of line test off-line test), to examine Survey function and the properties of variator, when described variator is after eol detection entrucking, even if the tcu in variator The Hardware & software system of (transmission control unit, transmission control unit) is all consistent, but due to Inevitably there is error because of parts quality and build-up tolerance in the hardware system of variator, be therefore typically required employing After tcu software carries out adaptive learning adjustment, just can obtain the target current value of variator, thus improving shift quality.

But need to carry out substantial amounts of experiment during adaptive learning, thus cause the labor when improving shift quality Fatigue resistance greatly enhances.

Content of the invention

In view of this, the application provides a kind of variator method of testing and system, to improve control accuracy and the speed change of tcu The shift quality of device.

To achieve these goals it is proposed that scheme as follows:

A kind of variator method of testing, be applied to variator offline during in characterisitic parameter Auto-Test System, comprising:

Obtain torque, the pressure signal of each clutch of variator of testing of electric motors;

It is calculated the torque of clutch according to described motor torque and clutch pressure signals;

Obtain the characterisitic parameter of variator;

Obtain the target current letter of electromagnetic valve according to the characterisitic parameter of described variator and the torque calculation of described clutch Number;

Control the aperture of electromagnetic valve according to described target current signal;

The described characterisitic parameter obtaining variator includes: obtains the pressure to current characterisitic parameter of clutch, obtains clutch Torque pressure characterisitic parameter, obtain clutch oil-filled characterisitic parameter.

Preferably, in above-mentioned variator method of testing, the described pressure to current characterisitic parameter obtaining clutch includes:

It is n that control input motor keeps rotating speed;

Increase the electromagnetic valve current of clutch to be measured every prefixed time interval according to the first predetermined current step-length, until by Till minimum electromagnetic valve current rises to the corresponding electric current of clutch binding site maximum pressure value, then every prefixed time interval according to Increase the electromagnetic valve current of clutch to be measured according to the second predetermined current step-length, until being corresponded to by clutch binding site maximum pressure value Electric current rise to maximum electromagnetic valve current till;

Reduce the electromagnetic valve current of clutch to be measured every prefixed time interval according to the second predetermined current step-length, until by Till maximum electromagnetic valve current is reduced to the corresponding electric current of clutch binding site maximum pressure value;Again every prefixed time interval according to Reduce the electromagnetic valve current of clutch to be measured according to the first predetermined current step-length, until being corresponded to by clutch binding site maximum pressure value Current reduction to minimum electromagnetic valve current;

Calculate electromagnetic valve current in uphill process electromagnetic valve current under each step-length electric current between last Preset Time Meansigma methodss pin1 every interior corresponding clutch pressure value;

Calculate last prefixed time interval under electromagnetic valve current electromagnetic valve current each step-length electric current in during declining Meansigma methodss pin2 of interior corresponding clutch pressure value;

Calculate electromagnetic valve current corresponding clutch pressure in each last prefixed time interval of step-length electromagnetic valve current Meansigma methodss pin1 of force value and meansigma methodss pinv of pin2, described pinv and the corresponding electric current of described pinv are clutch Pressure to current characterisitic parameter.

Preferably, in above-mentioned variator method of testing, the described torque pressure characterisitic parameter obtaining clutch includes:

Control under a certain gear, control the electromagnetic valve current of two clutches and converter lockout electromagnetic valve current to close Close, control the current value of the 3rd clutch to increase to maximum controlling current by minimum control electric current;

Control input motor speed is n, and output motor rotating speed is (n × λi-m)/λo, wherein m is fixing slippage of clutch, λiIt is the equivalent equivalent gearratio to clutch one end to be measured rotating speed of input shaft rotating speed from variator, λoFor output rotating speed etc. Imitate the equivalent gearratio of clutch other end rotating speed to be measured;

In the first pre-set interval that electromagnetic valve current increases to maximum controlling current by minimum control electric current, current value is adopted Increased with the first rate of change;The second rate of change is adopted to increase in the second pre-set interval, the motor torque instrument of record input simultaneously Torque tePressure p with clutchc, wherein said first rate of change is less than the second rate of change, and, in time relationship, described the One pre-set interval is adjacent and shifts to an earlier date in described second pre-set interval;

The moment corresponding clutch of first input motor increase 2nm in first pre-set interval described in electromagnetic valve current Pressure value is as combination pressure p of clutch systemkp

Record is in the second pre-set interval internal clutch maximum pressure value pmax, record initial in described second pre-set interval The pressure value of the clutch in moment is pt

Choose preferred linearly interval (p by described second pre-set intervalt2p_dn, pt2p_up), wherein pt2p_up=pmax- 0.4, pt2p_dn=pt+0.2;

Moment coefficient f according to clutch under each gear of variatorcDragging torque t with variatordragAccording to formula tc =fc·(te-tdrag) calculate the net torque t that clutch transmitsc

Linear fit is carried out using method of least square by corresponding clutch torque in described preferred linearly interval and pressure, Obtain the torque pressure characteristic curve of clutch: pc_10nm=kt2p×(tc-10);Wherein pc_10nmTransmit 10nm institute for clutch Corresponding clutch pressure, kt2pSlope for the torque pressure characterisitic parameter of clutch;

Combination pressure p by described clutch systemkp, clutch torque pressure characterisitic parameter slope kt2pAnd clutch Device transmits the clutch pressure p corresponding to 10nmc_10nmTorque pressure characterisitic parameter as described clutch.

Preferably, in above-mentioned variator method of testing, the described oil-filled characterisitic parameter obtaining clutch includes:

Combination pressure p by the pressure to current characterisitic parameter of described clutch and described clutch systemkpFill as regulation Oily control parameter, and control input motor speed is n;

Transmission control unit is according to the initial prime time t gettingftCarry out oil-filled control;

Described control unit presets oil-filled control parameter and the oil-filled control parameter of described regulation calculates target control pressure, and Pressure to current characterisitic parameter according to clutch controls electromagnetic valve current;

Calculate oil-filled time delay area sf(n);

Judge oil-filled time delay area sfN whether () be less than preset value, if it is, by described initial prime time tftAs The oil-filled characterisitic parameter of clutch, otherwise according to formula tft1=tft+κ(sf(n))sfN () adjusts the initial prime time, and will count The oil-filled time t obtainingft1As the initial prime time, re-start oil-filled control according to the initial prime time after adjustment, Until described oil-filled time delay area sfN () is less than preset value, by oil-filled time delay area sfCorresponding adjustment when () is less than preset value n The initial prime time afterwards is as the oil-filled characterisitic parameter of clutch.

A kind of speed changer test system, described system includes:

Transmission control unit, for obtaining the torque of testing of electric motors, the pressure signal of each clutch of variator, and foundation The pressure signal of the torque of described testing of electric motors and each clutch of described variator is calculated the torque of clutch, then foundation The torque calculation of the characterisitic parameter of variator and described clutch obtains the target current signal of electromagnetic valve, and according to described target Current signal controls the aperture of electromagnetic valve;

It is arranged on the memorizer on variator, described memorizer is used for storing the characterisitic parameter of variator, wherein said change The characterisitic parameter of fast device includes: the pressure to current characterisitic parameter of clutch, the torque pressure characterisitic parameter of clutch, clutch The memorizer of oil-filled characterisitic parameter.

Preferably, in above-mentioned variator method of testing, the pressure to current characterisitic parameter of the clutch in described memorizer It is the pressure to current characterisitic parameter of the clutch being got using following methods:

It is n that control input motor keeps rotating speed;

Increase the electromagnetic valve current of clutch to be measured every prefixed time interval according to the first predetermined current step-length, until by Till minimum electromagnetic valve current rises to the corresponding electric current of clutch binding site maximum pressure value, then every prefixed time interval according to Increase the electromagnetic valve current of clutch to be measured according to the second predetermined current step-length, until being corresponded to by clutch binding site maximum pressure value Electric current rise to maximum electromagnetic valve current till;

Reduce the electromagnetic valve current of clutch to be measured every prefixed time interval according to the second predetermined current step-length, until by Till maximum electromagnetic valve current is reduced to the corresponding electric current of clutch binding site maximum pressure value;Again every prefixed time interval according to Reduce the electromagnetic valve current of clutch to be measured according to the first predetermined current step-length, until being corresponded to by clutch binding site maximum pressure value Current reduction to minimum electromagnetic valve current;

Calculate electromagnetic valve current in uphill process electromagnetic valve current under each step-length electric current between last Preset Time Meansigma methodss pin1 every interior corresponding clutch pressure value;

Calculate last prefixed time interval under electromagnetic valve current electromagnetic valve current each step-length electric current in during declining Meansigma methodss pin2 of interior corresponding clutch pressure value;

Calculate electromagnetic valve current corresponding clutch pressure in each last prefixed time interval of step-length electromagnetic valve current Meansigma methodss pin1 of force value and meansigma methodss pinv of pin2, described pinv and the corresponding electric current of described pinv are clutch Pressure to current characterisitic parameter.

Preferably, in above-mentioned variator method of testing, the torque pressure characterisitic parameter of the clutch in described memorizer is The torque pressure characterisitic parameter of the clutch being got using following methods:

Control under a certain gear, control the electromagnetic valve current of two clutches and converter lockout electromagnetic valve current to close Close, control the current value of the 3rd clutch to increase to maximum controlling current by minimum control electric current;

Control input motor speed is n, and output motor rotating speed is (n × λi-m)/λo, wherein m is fixing slippage of clutch, λiIt is the equivalent equivalent gearratio to clutch one end to be measured rotating speed of input shaft rotating speed from variator, λoFor output rotating speed etc. Imitate the equivalent gearratio of clutch other end rotating speed to be measured;

In the first pre-set interval that electromagnetic valve current increases to maximum controlling current by minimum control electric current, current value is adopted Increased with the first rate of change;The second rate of change is adopted to increase in the second pre-set interval, the motor torque instrument of record input simultaneously Torque tePressure p with clutchc, wherein said first rate of change is less than the second rate of change, and, in time relationship, described the One pre-set interval is adjacent and shifts to an earlier date in described second pre-set interval;

The moment corresponding clutch of first input motor increase 2nm in first pre-set interval described in electromagnetic valve current Pressure value is as combination pressure p of clutch systemkp

Record is in the second pre-set interval internal clutch maximum pressure value pmax, record initial in described second pre-set interval The pressure value of the clutch in moment is pt

Choose preferred linearly interval (p by described second pre-set intervalt2p_dn, pt2p_up), wherein pt2p_up=pmax- 0.4, pt2p_dn=pt+0.2;

Moment coefficient f according to clutch under each gear of variatorcDragging torque t with variatordragAccording to formula tc =fc·(te-tdrag) calculate the net torque t that clutch transmitsc

Linear fit is carried out using method of least square by corresponding clutch torque in described preferred linearly interval and pressure, Obtain the torque pressure characteristic curve of clutch: pc_10nm=kt2p×(tc-10);Wherein pc_10nmTransmit 10nm institute for clutch Corresponding clutch pressure, kt2pSlope for the torque pressure characterisitic parameter of clutch;

Combination pressure p by described clutch systemkp, clutch torque pressure characterisitic parameter slope kt2pAnd clutch Device transmits the clutch pressure p corresponding to 10nmc_10nmTorque pressure characterisitic parameter as described clutch.

Preferably, in above-mentioned variator method of testing, the torque pressure characterisitic parameter of the clutch in described memorizer is The oil-filled characterisitic parameter of the clutch being got using following methods:

Combination pressure p by the pressure to current characterisitic parameter of described clutch and described clutch systemkpFill as regulation Oily control parameter, and control input motor speed is n;

Transmission control unit is according to the initial prime time t gettingftCarry out oil-filled control;

Described control unit presets oil-filled control parameter and the oil-filled control parameter of described regulation calculates target control pressure, and Pressure to current characterisitic parameter according to clutch controls electromagnetic valve current;

Calculate oil-filled time delay area sf(n);

Judge oil-filled time delay area sfN whether () be less than preset value, if it is, by described initial prime time tftAs The oil-filled characterisitic parameter of clutch, otherwise according to formula tft1=tft+κ(sf(n))sfN () adjusts the initial prime time, and will count The oil-filled time t obtainingft1As the initial prime time, re-start oil-filled control according to the initial prime time after adjustment, Until described oil-filled time delay area sfN () is less than preset value, by oil-filled time delay area sfCorresponding adjustment when () is less than preset value n The initial prime time afterwards is as the oil-filled characterisitic parameter of clutch.

It can be seen from above-mentioned technical scheme that, variator method of testing disclosed in the present application and system, by adopting State the pressure signal of the torque to described and described testing of electric motors of the characterisitic parameter of variator and each clutch of variator, and It is calculated the torque of clutch according to described motor torque and clutch pressure signals, finally the characterisitic parameter of described variator Obtain the target current signal of electromagnetic valve with the torque calculation of described clutch, and control electromagnetism according to described target current signal The aperture of valve is obviously reduced it is seen then that comparing with technical scheme workload of the prior art, simultaneously in test process using from Characterisitic parameter between the torque of clutch and pressure, the characterisitic parameter between pressure and electric current and oil-filled characterisitic parameter significantly carry The control accuracy of high variator, improves the shift quality of variator.

Brief description

In order to be illustrated more clearly that the embodiment of the present application or technical scheme of the prior art, below will be to embodiment or existing Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this Some embodiments of application, for those of ordinary skill in the art, on the premise of not paying creative work, acceptable Other accompanying drawings are obtained according to these accompanying drawings.

Fig. 1 is the flow chart of variator method of testing disclosed in the embodiment of the present application;

Fig. 2 is the flow chart of the disclosed pressure to current characterisitic parameter obtaining clutch of the embodiment of the present application;

Fig. 3 is clutch pressure disclosed in the present application, current relationship schematic diagram;

Fig. 4 a is clutch pressure ascent stage pressure, current relationship schematic diagram;

Fig. 4 b is clutch pressure decline stage pressure, current relationship schematic diagram;

Fig. 4 c is the average pressure value in clutch rise and fall stage, the schematic diagram of current relationship;

Fig. 5 is the flow chart of the disclosed torque pressure characterisitic parameter obtaining clutch of the embodiment of the present application;

Fig. 6 is the relation signal that clutch disclosed in embodiment inputs motor torque, electromagnetic valve current, clutch pressure Figure;

Fig. 7 is the flow chart of the disclosed oil-filled characterisitic parameter obtaining clutch of another embodiment of the application:

Fig. 8 is the schematic diagram of the different oil-filled result of three kinds of clutch;

Fig. 9 is the structure chart of speed changer test system disclosed in the embodiment of the present application.

Specific embodiment

It is directed in prior art and adopts adaptive learning to improve shift quality, and the worker workload causing is big Problem, this application discloses a kind of variator method of testing and system.

Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is carried out clear, complete Site preparation describes it is clear that described embodiment is only some embodiments of the present application, rather than whole embodiments.It is based on Embodiment in the application, it is every other that those of ordinary skill in the art are obtained under the premise of not making creative work Embodiment, broadly falls into the scope of the application protection.

Fig. 1 is the flow chart of variator method of testing disclosed in the embodiment of the present application.

Referring to Fig. 1, methods described includes:

Step s101: obtain torque, the pressure signal of each clutch of variator of testing of electric motors, the wherein each clutch of variator The pressure signal of device is the pressure signal obtaining clutch according to the pressure transducer of speed changer pressure tap;

Step s102: be calculated the torque of clutch according to described motor torque and clutch pressure signals;

Step s103: obtain the characterisitic parameter of variator, the characterisitic parameter of described variator includes: the pressure electricity of clutch Properties of flow parameter, the torque pressure characterisitic parameter of clutch, the oil-filled characterisitic parameter of clutch, wherein said pressure to current characteristic Parameter, torque pressure characterisitic parameter, the oil-filled characterisitic parameter pressure signal according to clutch, the speed change by can communication acquisition The signals such as the control electric current signal of device obtain;

Step s104: obtain the mesh of electromagnetic valve according to the characterisitic parameter of described variator and the torque calculation of described clutch Mark current signal;

Step s105: control the aperture of electromagnetic valve, the regulation of clutch pressure according to described target current signal.

With the pressure to current characterisitic parameter of the clutch in above-described embodiment, the torque pressure characterisitic parameter of clutch and from As a example the characterisitic parameter as described variator for the oil-filled characterisitic parameter of clutch, disclosed described variator in the above-described embodiments Before method of testing, can also include obtaining the characterisitic parameter of described variator in advance.

Fig. 2 is the flow chart of the disclosed pressure to current characterisitic parameter obtaining clutch of the embodiment of the present application.

Referring to Fig. 2, the pressure to current characterisitic parameter of the described clutch of described acquisition includes may include that

Step s201: it is n that control input motor keeps rotating speed;Here it is pointed out that described input turning of motor Speed can be adjusted according to user's request, for example, described input motor speed can be 2000rpm, therefore the application not The rotating speed size of described input motor is specifically limited;

Step s202: increase the electromagnetic valve electricity of clutch to be measured according to the first predetermined current step-length every prefixed time interval Stream, when electromagnetic valve current rises to the corresponding electric current of clutch binding site maximum pressure value, every prefixed time interval foundation Second predetermined current step-length increases electromagnetic valve current, till rising to maximum electromagnetic valve current;

Step s203: reduce electromagnetic valve current every prefixed time interval according to the second predetermined current step-length, until reducing To the corresponding electric current of clutch binding site maximum pressure value;Again every prefixed time interval according to the first predetermined current step-length Reduce electromagnetic valve current, till being reduced to minimum electromagnetic valve current;

Step s204: calculate electromagnetic valve current electromagnetic valve current in uphill process finally pre- under each step-length electric current in If meansigma methodss pin1 of corresponding clutch pressure value in the time period (prefixed time interval);

Step s205: calculate electromagnetic valve current finally pre- under electromagnetic valve current each step-length electric current in during declining If meansigma methodss pin2 of corresponding clutch pressure value in the time period (prefixed time interval);

Step s206: calculate electromagnetic valve current corresponding in each last prefixed time interval of step-length electromagnetic valve current Meansigma methodss pin1 of clutch pressure value and meansigma methodss pinv of pin2, described pinv is in described pinv and described pinv The corresponding pressure to current characterisitic parameter compensating electric current as clutch.

Transmission pressure system can be effectively reduced using said method because parts difference, assembling difference are brought Variator pressure current characteristics difference, it is possible to increase variator tcu software control accuracy.

Fig. 3 is clutch pressure disclosed in the present application, current relationship schematic diagram.

Fig. 4 a is clutch pressure ascent stage pressure, current relationship schematic diagram.

Fig. 4 b is clutch pressure decline stage pressure, current relationship schematic diagram.

Fig. 4 c is the average pressure value in clutch rise and fall stage, the schematic diagram of current relationship.

Referring to Fig. 3, Fig. 3 be with the described input motor in above-described embodiment as 2000rpm, described prefixed time interval big In 50ms, fixing slippage be 40rpm, the corresponding electric current of clutch binding site maximum pressure value be 400ma, minimum electromagnetism valve test Electric current i_l_limit is 300ma, maximum electromagnetism valve test electric current i_h_limit is 1000ma, the first predetermined current step-length △ i_ Kp be 10ma, the second predetermined current step-length △ i_akp be 100ma, last prefixed time interval be clutch as a example 50ms Pressure, the relation schematic diagram of electric current.

Referring to Fig. 3-Fig. 4 c, the method obtaining clutch voltage-current characteristic parameter in the present embodiment includes:

Step 1, control input motor is to 2000rpm, and keeps constant rotational speed;

Step 2, the electromagnetic valve current value of clutch to be measured of according to the current control mode shown in Fig. 3, controlling, and according to The sample frequency of 1khz gathers the pressure value of target current value and clutch;

Step 3, calculating current raising and lowering stage each step-length electric current inThe corresponding clutch pressure of last 50ms down Meansigma methodss p of force valueinTeady state pressure value for this electric current;

Step 4, according to inWith the value of pin1, according to the method for Fig. 4 a and Fig. 4 b, draw respectively obtain electric current rise and under Clutch pressure during fall and the characteristic curve of current value;

Step 5, according to the clutch pressure during raising and lowering and current value characteristic curve, take same step-length electric current The meansigma methodss of the pressure value in lower raising and lowering stage, to obtain in the clutch pressure and current value characteristic curve in Fig. 4 c Between be worth curve;

Step 6, using the median curve of described clutch pressure and current value characteristic curve as described clutch pressure Power current characteristics parameter, wherein it should be noted that the pressure to current characterisitic parameter of described clutch can be complete clutch The median curve of pressure and current value characteristic curve or described median curve some coordinate points up.

Fig. 5 is the flow chart of the disclosed torque pressure characterisitic parameter obtaining clutch of the embodiment of the present application.

Torque pressure characterisitic parameter referring to Fig. 5, described acquisition clutch includes:

Step s501: control the electromagnetic valve current controlling two clutches under a certain gear and converter lockout electricity Magnet valve circuit closed, controls the current value of the 3rd clutch to increase to maximum controlling current by minimum control electric current;

Step s502: control input motor speed is n, output motor rotating speed is (n × λi-m)/λo, wherein m is clutch Fixing slippage, λiFrom the equivalent equivalent gearratio to clutch one end to be measured rotating speed of the input shaft rotating speed of variator, λoFor output shaft The equivalent equivalent gearratio to clutch other end rotating speed to be measured of rotating speed;

Step s503: the first pre-set interval of maximum controlling current is increased to by minimum control electric current in electromagnetic valve current Interior, current value adopts the first rate of change to increase;The second rate of change is adopted to increase in the second pre-set interval, the electricity of record input simultaneously The torque t of machine torquemeterePressure p with clutchc, wherein said first rate of change be less than the second rate of change, and, the time close Fasten, described first pre-set interval is adjacent and shifts to an earlier date in described second pre-set interval;

Step s504: in the first pre-set interval described in electromagnetic valve current, the moment of first input motor increase 2nm corresponds to Clutch pressure value as clutch system combination pressure pkp

Step s505: record is in the second pre-set interval internal clutch maximum pressure value pmax, record is in described second preset areas The pressure value of the clutch of interior initial time is pt

Step s506: choose preferred linearly interval (p by described second pre-set intervalt2p_dn, pt2p_up), wherein pt2p_up =pmax- 0.4, pt2p_dn=pt+0.2;

Step s507: according to the moment coefficient f of clutch under each gear of variatorcDragging torque t with variatordrag According to formula tc=fc·(te-tdrag) calculate the net torque t that clutch transmitsc

Step s508: carried out using method of least square by corresponding clutch torque in described preferred linearly interval and pressure Linear fit, obtains the torque pressure characteristic curve of clutch: pc_10nm=kt2p×(tc-10);Wherein pc_10nmPass for clutch Pass the clutch pressure corresponding to 10nm, kt2pSlope for the torque pressure characterisitic parameter of clutch;

Step s509: by combination pressure p of described clutch systemkp, clutch torque pressure characterisitic parameter slope kt2pTransmit the clutch pressure p corresponding to 10nm with clutchc_10nmTorque pressure characterisitic parameter as described clutch.

The activating pressure characterisitic parameter of clutch can accurately be obtained by said method, speed change can be effectively reduced The property difference that device mechanical system is brought because of parts difference, assembling difference, it is possible to increase variator tcu software controls essence Degree.

Fig. 6 is the relation signal that clutch disclosed in embodiment inputs motor torque, electromagnetic valve current, clutch pressure Figure.

Referring to Fig. 6, Fig. 6 be with the described input motor speed in above-described embodiment as 2000rpm, fixing slippage be 40rpm, described maximum controlling current are 1000ma, described minimum control electric current value is 0ma, pre-set interval described in described first is (320ma, 400ma), described first rate of change be 1ma/200ms, the second pre-set interval be (400ma, 550ma), described first Rate of change is the input motor torque of clutch during 2ma/100ms, electromagnetic valve current, the graph of a relation between clutch pressure.

Referring to Fig. 6, the torque pressure characterisitic parameter process of the calculating clutch in this embodiment includes:

Step 1, the two of which under certain gear of controlling close electromagnetic valve current value and the converter lockout of clutch To maximum controlling current 1000ma, the electromagnetic valve current of clutch to be measured is 0ma to the current value of electromagnetic valve.Then control input electricity Machine is to 2000rpm, control output motor to (2000 × λi-40)/λoRpm, keeps clutch to be measured to be in the slippage of 40rpm;

Step 2, control clutch to be measured electromagnetic valve current according to shown in Fig. 5, in 320-400ma interval 1ma/ The rate of change of 200ms increases, and increases in the interval rate of change with 2ma/100ms of 400-550ma, the Motor torque of record input simultaneously The torque t of instrumentePressure p with clutchc

When step 3, clutch solenoid valve electric current are between 320-400ma, with the increase of electric current, the pressure of clutch by Cumulative plus, but the starting stage input motor torque be tdragKeep constant, wherein tdragDamage for transmission oil pump running torque Mistake, mechanical friction torque loss, fluid torque loss sum, the also referred to as dragging torque of variator, with clutch pressure Continue to increase, because friction plate to be measured starts to eliminate gap transmit torque, lead to the torque inputting motor to start to increase, definition the The clutch pressure in one input motor increase 2nm correspondence moment is the activating pressure p of this clutch systemkp

, in the range of 400-550ma, the pressure with clutch is linearly increasing for step 4, electromagnetic valve current, input motor The also linear increase of torque, the maximum pressure recording this section of current range internal clutch is pmax, clutch clutch in 400ma The pressure value of device is designated as pt, in order to improve the computational accuracy of the torque pressure characterisitic parameter of clutch, turning in matching clutch Can be only with region that pressure is the most linear during square pressure characteristic parameter: (pt2p_dn, pt2p_up), wherein pt2p_up=pmax- 0.4, pt2p_dn =pt+ 0.2, this pressure span corresponding input motor torque is (tt2p_dn, tt2p_up).

Step 5, according to clutch torque coefficient f under each gear of automatic transmissionc(turn from transmission input shaft torque Change to the conversion coefficient of clutch torque) and variator dragging torque tdragCalculate the net torque t of clutch transmissionc: tc= fc·(te-tdrag);

Step 6, by (tt2p_dn, tt2p_up) corresponding clutch torque and pressure adopt method of least square Linear Quasi in interval Close the straight line of the torque pressure characterisitic parameter obtaining clutch: pc_10nm=kt2p×(tc- 10), wherein pc_10nmPass for clutch Pass the clutch pressure corresponding to 10nm, kt2pSlope for the torque pressure characterisitic parameter of clutch;

Step 7, by combination pressure p of described clutch systemkp, clutch torque pressure characterisitic parameter slope kt2p Transmit the clutch pressure p corresponding to 10nm with clutchc_10nmTorque pressure characterisitic parameter as described clutch.

Fig. 7 is the flow chart of the disclosed oil-filled characterisitic parameter obtaining clutch of another embodiment of the application.

Fig. 8 is the schematic diagram of the different oil-filled result of three kinds of clutch.

Referring to Fig. 7, the flow process obtaining the oil-filled characterisitic parameter of described clutch in the present embodiment includes:

Step s701: by combination pressure p of the pressure to current characterisitic parameter of described clutch and described clutch systemkpMake For adjusting oil-filled control parameter, and control input motor speed is n;

Step s702: transmission control unit is according to the initial prime time t gettingftCarry out oil-filled control;

Step s703: described control unit presets oil-filled control parameter and the oil-filled control parameter of described regulation calculates target control Pressing pressure, and control electromagnetic valve current according to the pressure to current characterisitic parameter of clutch;

Step s704: calculate oil-filled time delay area sf(n);

Step s605: judge oil-filled time delay area sfN whether () be less than preset value, if it is, by described initial prime Time tftAs the oil-filled characterisitic parameter of clutch, otherwise according to formula tft1=tft+κ(sf(n))sfN () adjusts initial prime Time, and by calculated oil-filled time tft1As the initial prime time, again enter according to the initial prime time after adjustment Row oil-filled control execution step s702, until described oil-filled time delay area sfN () is less than preset value, by oil-filled time delay area sf(n) The initial prime time after the corresponding adjustment less than during preset value is as the oil-filled characterisitic parameter of clutch.

Wherein, calculate oil-filled time delay area sfN the process of () may include that

A, acquisition actual pressure psMaximum ps_maxAnd its corresponding time t2;

B, with ps_maxOn the basis of, obtain than described ps_maxFirst pressure value p of little 1.5bars_tAnd its corresponding time t1;

C, by the actual pressure p in time t1-t2sCarry out fitting a straight line with method of least square and obtain straight line l, its cathetus L represents psPreferable actual pressure, it represents the delay that there is not pressure in pressure ramp ascent stage;

D, by preferable actual pressure l and actual pressure psMathematic interpolation actual pressure psDelay size, and obtain Big value of delta pmaxCorresponding time tmax.

E, to time interval (tmax- 10, tmax+ 10) the pressure difference value l-p insIt is integrated being calculated pressure retarded face Long-pending sf(n), computing formula is:

Fig. 8 is the structure chart of speed changer test system disclosed in the embodiment of the present application.

May be appreciated and correspond to said method, disclosed herein as well is a kind of transmission system, referring to Fig. 8, described Transmission system may include that

Transmission control unit 1, for obtaining input torque, the speed changer structure parameter of testing of electric motors, and variator Characterisitic parameter, and it is calculated the torque of clutch according to described testing of electric motors input torque and described speed changer structure parameter, Then the target current signal of electromagnetic valve is obtained according to the characterisitic parameter of described variator and the torque calculation of described clutch, and Control the aperture of the electromagnetic valve on variator according to described target current signal;

It is arranged on the memorizer on variator, for storing the characterisitic parameter of variator.

Wherein, described memorizer 1 is the be stored with pressure to current characterisitic parameter of clutch, the torque pressure characteristic of clutch Parameter, the memorizer of the oil-filled characterisitic parameter of clutch, and described memorizer can be subrom memorizer.

It is understood that, in the described memorizer 1 pressure to current characteristic of the clutch of storage corresponding with said method Parameter be the clutch being got using following methods pressure to current characterisitic parameter:

It is n that control input motor keeps rotating speed;

Increase the electromagnetic valve current of clutch to be measured every prefixed time interval according to the first predetermined current step-length, until by Till minimum electromagnetic valve current rises to the corresponding electric current of clutch binding site maximum pressure value, then every prefixed time interval according to Increase the electromagnetic valve current of clutch to be measured according to the second predetermined current step-length, until being corresponded to by clutch binding site maximum pressure value Electric current rise to maximum electromagnetic valve current till;

Reduce the electromagnetic valve current of clutch to be measured every prefixed time interval according to the second predetermined current step-length, until by Till maximum electromagnetic valve current is reduced to the corresponding electric current of clutch binding site maximum pressure value;Again every prefixed time interval according to Reduce the electromagnetic valve current of clutch to be measured according to the first predetermined current step-length, until being corresponded to by clutch binding site maximum pressure value Current reduction to minimum electromagnetic valve current;

Calculating electromagnetic valve current last Preset Time under each step-length electric current in electromagnetic valve current in uphill process Meansigma methodss pin1 of corresponding clutch pressure value in interval;

Calculating electromagnetic valve current is under electromagnetic valve current each step-length electric current in during declining between last Preset Time Meansigma methodss pin2 every interior corresponding clutch pressure value;

Calculate electromagnetic valve current corresponding clutch pressure in each last prefixed time interval of step-length electromagnetic valve current Meansigma methodss pin1 of force value and meansigma methodss pinv of pin2, described pinv and described pinv corresponding step-length electric current are clutch The pressure to current characterisitic parameter of device.

Corresponding with methods described, in described memorizer, the torque pressure characterisitic parameter of clutch is to be obtained using following methods The torque pressure characterisitic parameter of the clutch got:

Control under a certain gear, control the electromagnetic valve current of two clutches and converter lockout electromagnetic valve current to close Close, control the current value of the 3rd clutch to increase to maximum controlling current by minimum control electric current;

Control input motor speed is n, and output motor rotating speed is (n × λi-m)/λo, wherein m is fixing slippage of clutch, λiIt is the equivalent equivalent gearratio to clutch one end to be measured rotating speed of input shaft rotating speed from variator, λoFor output rotating speed etc. Imitate the equivalent gearratio of clutch other end rotating speed to be measured;

In the first pre-set interval that electromagnetic valve current increases to maximum controlling current by minimum control electric current, current value is adopted Increased with the first rate of change;The second rate of change is adopted to increase in the second pre-set interval, the motor torque instrument of record input simultaneously Torque tePressure p with clutchc, wherein said first rate of change is less than the second rate of change, and, in time relationship, described the One pre-set interval is adjacent and shifts to an earlier date in described second pre-set interval;

The moment corresponding clutch of first input motor increase 2nm in first pre-set interval described in electromagnetic valve current Pressure value is as combination pressure p of clutch systemkp

Record is in the second pre-set interval internal clutch maximum pressure value pmax, record initial in described second pre-set interval The pressure value of the clutch in moment is pt

Choose preferred linearly interval (p by described second pre-set intervalt2p_dn, pt2p_up), wherein pt2p_up=pmax- 0.4, pt2p_dn=pt+0.2;

Moment coefficient f according to clutch under each gear of variatorcDragging torque t with variatordragAccording to formula tc =fc·(te-tdrag) calculate the net torque t that clutch transmitsc

Linear fit is carried out using method of least square by corresponding clutch torque in described preferred linearly interval and pressure, Obtain the torque pressure characteristic curve of clutch: pc_10nm=kt2p×(tc-10);Wherein pc_10nmTransmit 10nm institute for clutch Corresponding clutch pressure, kt2pSlope for the torque pressure characterisitic parameter of clutch;

Combination pressure p by described clutch systemkp, clutch torque pressure characterisitic parameter slope kt2pAnd clutch Device transmits the clutch pressure p corresponding to 10nmc_10nmTorque pressure characterisitic parameter as described clutch.

Corresponding with methods described, the oil-filled characterisitic parameter of the clutch in described memorizer is to be obtained using following methods The oil-filled characterisitic parameter of the clutch arriving:

Combination pressure p by the pressure to current characterisitic parameter of described clutch and described clutch systemkpFill as regulation Oily control parameter, and control input motor speed is n;

Transmission control unit is according to the initial prime time t gettingftCarry out oil-filled control;

Described control unit presets oil-filled control parameter and the oil-filled control parameter of described regulation calculates target control pressure, and Pressure to current characterisitic parameter according to clutch controls electromagnetic valve current;

Calculate oil-filled time delay area sf(n);

Judge oil-filled time delay area sfN whether () be less than preset value, if it is, by described initial prime time tftAs The oil-filled characterisitic parameter of clutch, otherwise according to formula tft1=tft+κ(sf(n))sfN () adjusts the initial prime time, and will count The oil-filled time t obtainingft1As the initial prime time, re-start oil-filled control according to the initial prime time after adjustment, Until described oil-filled time delay area sfN () is less than preset value, by oil-filled time delay area sfCorresponding adjustment when () is less than preset value n The initial prime time afterwards is as the oil-filled characterisitic parameter of clutch.

Last in addition it is also necessary to explanation, herein, such as first and second or the like relational terms be used merely to by One entity or operation are made a distinction with another entity or operation, and not necessarily require or imply these entities or operation Between there is any this actual relation or order.And, term " inclusion ", "comprising" or its any other variant meaning Covering comprising of nonexcludability, so that including a series of process of key elements, method, article or equipment not only include that A little key elements, but also include other key elements being not expressly set out, or also include for this process, method, article or The intrinsic key element of equipment.In the absence of more restrictions, the key element being limited by sentence "including a ...", does not arrange Remove and also there is other identical element in the process including described key element, method, article or equipment.

In this specification, each embodiment is described by the way of going forward one by one, and what each embodiment stressed is and other The difference of embodiment, between each embodiment identical similar portion mutually referring to.

Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the application. Multiple modifications to these embodiments will be apparent from for those skilled in the art, as defined herein General Principle can be realized in the case of without departing from spirit herein or scope in other embodiments.Therefore, the application It is not intended to be limited to the embodiments shown herein, and be to fit to and principles disclosed herein and features of novelty phase one The scope the widest causing.

Claims (8)

1. a kind of variator method of testing, be applied to variator offline during in characterisitic parameter Auto-Test System, its feature It is, comprising:
Obtain torque, the pressure signal of each clutch of variator of testing of electric motors;
It is calculated the torque of clutch according to the pressure signal of the torque of described testing of electric motors, each clutch of variator;
Obtain the characterisitic parameter of variator;
Obtain the target current signal of electromagnetic valve according to the characterisitic parameter of described variator and the torque calculation of described clutch;
Control the aperture of electromagnetic valve according to described target current signal;
The described characterisitic parameter obtaining variator includes: obtains the pressure to current characterisitic parameter of clutch, obtains turning of clutch Square pressure characteristic parameter, the oil-filled characterisitic parameter of acquisition clutch.
2. according to the variator method of testing in claim 1 it is characterised in that the pressure to current characteristic of described acquisition clutch Parameter includes:
It is n that control input motor keeps rotating speed;
Increase the electromagnetic valve current of clutch to be measured every prefixed time interval according to the first predetermined current step-length, until by minimum Till electromagnetic valve current rises to the corresponding electric current of clutch binding site maximum pressure value, then every prefixed time interval according to the Two predetermined current step-lengths increase the electromagnetic valve current of clutch to be measured, until by the corresponding electricity of clutch binding site maximum pressure value Till stream rises to maximum electromagnetic valve current;
Reduce the electromagnetic valve current of clutch to be measured every prefixed time interval according to the second predetermined current step-length, until by maximum Till electromagnetic valve current is reduced to the corresponding electric current of clutch binding site maximum pressure value;Again every prefixed time interval according to the One predetermined current step-length reduces the electromagnetic valve current of clutch to be measured, until by the corresponding electricity of clutch binding site maximum pressure value Till stream is reduced to minimum electromagnetic valve current;
Calculate in electromagnetic valve current electromagnetic valve current last prefixed time interval under each step-length electric current in uphill process Meansigma methodss pin1 of corresponding clutch pressure value;
Calculate in electromagnetic valve current electromagnetic valve current last prefixed time interval under each step-length electric current in during declining Meansigma methodss pin2 of corresponding clutch pressure value;
Calculate electromagnetic valve current corresponding clutch pressure value in each last prefixed time interval of step-length electromagnetic valve current Meansigma methodss pin1 and pin2 meansigma methodss pinv, described pinv and the corresponding electric current of described pinv are the pressure of clutch Current characteristics parameter.
3. according to the variator method of testing in claim 2 it is characterised in that the torque pressure characteristic of described acquisition clutch Parameter includes:
Control under a certain gear, control electromagnetic valve current and the converter lockout electromagnetic valve current closure of two clutches, The current value controlling the 3rd clutch increases to maximum controlling current by minimum control electric current;
Control input motor speed is n, and output motor rotating speed is (n × λi-m)/λo, wherein m is fixing slippage of clutch, λiFor From the equivalent equivalent gearratio to clutch one end to be measured rotating speed of the input shaft rotating speed of variator, λoIn order to export, rotating speed is equivalent to be arrived The equivalent gearratio of clutch other end rotating speed to be measured;
In the first pre-set interval that electromagnetic valve current increases to maximum controlling current by minimum control electric current, current value adopts One rate of change increases;The second rate of change is adopted to increase in the second pre-set interval, the torque of the motor torque instrument of record input simultaneously tePressure p with clutchc, wherein said first rate of change be less than the second rate of change, and, in time relationship, described first is pre- If interval is adjacent and shifts to an earlier date in described second pre-set interval;
The pressure of the moment corresponding clutch of first input motor increase 2nm in first pre-set interval described in electromagnetic valve current Value is as combination pressure p of clutch systemkp
Record is in the second pre-set interval internal clutch maximum pressure value pmax, record initial time in described second pre-set interval Clutch pressure value be pt
Choose preferred linearly interval (p by described second pre-set intervalt2p_dn, pt2p_up), wherein pt2p_up=pmax- 0.4, pt2p_dn=pt+0.2;
Moment coefficient f according to clutch under each gear of variatorcDragging torque t with variatordragAccording to formula tc= fc·(te-tdrag) calculate the net torque t that clutch transmitsc
Linear fit is carried out using method of least square by corresponding clutch torque in described preferred linearly interval and pressure, obtains The torque pressure characteristic curve of clutch: pc_10nm=kt2p×(tc-10);Wherein pc_10nmCorresponding to clutch transmission 10nm Clutch pressure, kt2pSlope for the torque pressure characterisitic parameter of clutch;
Combination pressure p by described clutch systemkp, clutch torque pressure characterisitic parameter slope kt2pPass with clutch Pass the clutch pressure p corresponding to 10nmc_10nmTorque pressure characterisitic parameter as described clutch.
4. according to the variator method of testing in claim 3 it is characterised in that the oil-filled characterisitic parameter of described acquisition clutch Including:
Combination pressure p by the pressure to current characterisitic parameter of described clutch and described clutch systemkpAs the oil-filled control of regulation Parameter processed, and control input motor speed is n;
Transmission control unit is according to the initial prime time t gettingftCarry out oil-filled control;
Described control unit presets oil-filled control parameter and the oil-filled control parameter of described regulation calculates target control pressure, and foundation The pressure to current characterisitic parameter of clutch controls electromagnetic valve current;
Calculate oil-filled time delay area sf(n);
Judge oil-filled time delay area sfN whether () be less than preset value, if it is, by described initial prime time tftAs clutch The oil-filled characterisitic parameter of device, otherwise according to formula tft1=tft+κ(sf(n))sfN () adjusts the initial prime time, and will calculate The oil-filled time t arrivingft1As the initial prime time, re-start oil-filled control according to the initial prime time after adjustment, until Described oil-filled time delay area sfN () is less than preset value, by oil-filled time delay area sfN () is less than corresponding adjustment during preset value after The initial prime time is as the oil-filled characterisitic parameter of clutch.
5. a kind of speed changer test system is it is characterised in that described system includes:
Transmission control unit, for obtaining the torque of testing of electric motors, the pressure signal of each clutch of variator, and according to described The pressure signal of the torque of testing of electric motors and each clutch of described variator is calculated the torque of clutch, then according to speed change The torque calculation of the characterisitic parameter of device and described clutch obtains the target current signal of electromagnetic valve, and according to described target current Signal controls the aperture of electromagnetic valve;
It is arranged on the memorizer on variator, described memorizer is used for storing the characterisitic parameter of variator, wherein said variator Characterisitic parameter include: the pressure to current characterisitic parameter of clutch, the torque pressure characterisitic parameter of clutch, clutch oil-filled The memorizer of characterisitic parameter.
6. according to the speed changer test system in claim 5 it is characterised in that the pressure electricity of clutch in described memorizer Properties of flow parameter be the clutch being got using following methods pressure to current characterisitic parameter:
It is n that control input motor keeps rotating speed;
Increase the electromagnetic valve current of clutch to be measured every prefixed time interval according to the first predetermined current step-length, until by minimum Till electromagnetic valve current rises to the corresponding electric current of clutch binding site maximum pressure value, then every prefixed time interval according to the Two predetermined current step-lengths increase the electromagnetic valve current of clutch to be measured, until by the corresponding electricity of clutch binding site maximum pressure value Till stream rises to maximum electromagnetic valve current;
Reduce the electromagnetic valve current of clutch to be measured every prefixed time interval according to the second predetermined current step-length, until by maximum Till electromagnetic valve current is reduced to the corresponding electric current of clutch binding site maximum pressure value;Again every prefixed time interval according to the One predetermined current step-length reduces the electromagnetic valve current of clutch to be measured, until by the corresponding electricity of clutch binding site maximum pressure value Till stream is reduced to minimum electromagnetic valve current;
Calculate in electromagnetic valve current electromagnetic valve current last prefixed time interval under each step-length electric current in uphill process Meansigma methodss pin1 of corresponding clutch pressure value;
Calculate in electromagnetic valve current electromagnetic valve current last prefixed time interval under each step-length electric current in during declining Meansigma methodss pin2 of corresponding clutch pressure value;
Calculate electromagnetic valve current corresponding clutch pressure value in each last prefixed time interval of step-length electromagnetic valve current Meansigma methodss pin1 and pin2 meansigma methodss pinv, described pinv and the corresponding electric current of described pinv are the pressure of clutch Current characteristics parameter.
7. according to the speed changer test system in claim 6 it is characterised in that the torque pressure of clutch in described memorizer Force characteristic parameter is the torque pressure characterisitic parameter of the clutch being got using following methods:
Control under a certain gear, control electromagnetic valve current and the converter lockout electromagnetic valve current closure of two clutches, The current value controlling the 3rd clutch increases to maximum controlling current by minimum control electric current;
Control input motor speed is n, and output motor rotating speed is (n × λi-m)/λo, wherein m is fixing slippage of clutch, λiFor From the equivalent equivalent gearratio to clutch one end to be measured rotating speed of the input shaft rotating speed of variator, λoIn order to export, rotating speed is equivalent to be arrived The equivalent gearratio of clutch other end rotating speed to be measured;
In the first pre-set interval that electromagnetic valve current increases to maximum controlling current by minimum control electric current, current value adopts One rate of change increases;The second rate of change is adopted to increase in the second pre-set interval, the torque of the motor torque instrument of record input simultaneously tePressure p with clutchc, wherein said first rate of change be less than the second rate of change, and, in time relationship, described first is pre- If interval is adjacent and shifts to an earlier date in described second pre-set interval;
The pressure of the moment corresponding clutch of first input motor increase 2nm in first pre-set interval described in electromagnetic valve current Value is as combination pressure p of clutch systemkp
Record is in the second pre-set interval internal clutch maximum pressure value pmax, record initial time in described second pre-set interval Clutch pressure value be pt
Choose preferred linearly interval (p by described second pre-set intervalt2p_dn, pt2p_up), wherein pt2p_up=pmax- 0.4, pt2p_dn=pt+0.2;
Moment coefficient f according to clutch under each gear of variatorcDragging torque t with variatordragAccording to formula tc= fc·(te-tdrag) calculate the net torque t that clutch transmitsc
Linear fit is carried out using method of least square by corresponding clutch torque in described preferred linearly interval and pressure, obtains The torque pressure characteristic curve of clutch: pc_10nm=kt2p×(tc-10);Wherein pc_10nmCorresponding to clutch transmission 10nm Clutch pressure, kt2pSlope for the torque pressure characterisitic parameter of clutch;
Combination pressure p by described clutch systemkp, clutch torque pressure characterisitic parameter slope kt2pPass with clutch Pass the clutch pressure p corresponding to 10nmc_10nmTorque pressure characterisitic parameter as described clutch.
8. the speed changer test system in claim 7 is it is characterised in that the torque pressure of clutch in described memorizer is special Property parameter is the oil-filled characterisitic parameter of the clutch being got using following methods:
Combination pressure p by the pressure to current characterisitic parameter of described clutch and described clutch systemkpAs the oil-filled control of regulation Parameter processed, and control input motor speed is n;
Transmission control unit is according to the initial prime time t gettingftCarry out oil-filled control;
Described control unit presets oil-filled control parameter and the oil-filled control parameter of described regulation calculates target control pressure, and foundation The pressure to current characterisitic parameter of clutch controls electromagnetic valve current;
Calculate oil-filled time delay area sf(n);
Judge oil-filled time delay area sfN whether () be less than preset value, if it is, by described initial prime time tftAs clutch The oil-filled characterisitic parameter of device, otherwise according to formula tft1=tft+κ(sf(n))sfN () adjusts the initial prime time, and will calculate The oil-filled time t arrivingft1As the initial prime time, re-start oil-filled control according to the initial prime time after adjustment, until Described oil-filled time delay area sfN () is less than preset value, by oil-filled time delay area sfN () is less than corresponding adjustment during preset value after The initial prime time is as the oil-filled characterisitic parameter of clutch.
CN201410408692.3A 2014-08-19 2014-08-19 Testing method and system of speed changer CN104316316B (en)

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