CN107741542B - Current pressure off-line learning method and test system of hydraulic automatic transmission - Google Patents
Current pressure off-line learning method and test system of hydraulic automatic transmission Download PDFInfo
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- CN107741542B CN107741542B CN201710950677.5A CN201710950677A CN107741542B CN 107741542 B CN107741542 B CN 107741542B CN 201710950677 A CN201710950677 A CN 201710950677A CN 107741542 B CN107741542 B CN 107741542B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a current pressure off-line learning method and a test system of a hydraulic automatic transmission, which meet learning conditions in the learning process and sequentially perform the following steps: current control is carried out on the clutch to be tested and other clutches to form a neutral gear; calculating torque converter slip n under neutralCV0(ii) a Setting a preset initial learning current; determining torque converter slip under current I output and torque converter slip under neutral nCV0Whether the difference value is greater than a set threshold value in a set time period; calculating the current pressure parameter deviation Delta I of the clutchP2C＝IR‑IKP(ii) a Calculating a characteristic parameter I of the current pressure of the clutchP2C＝Ideft+ΔIP2CAnd stored to the EEROM; the method has the advantages that the actual pressure sensor signal is not required to be directly obtained, the change of the load change of the clutch on the slip of the hydraulic torque converter is indirectly reflected, the final current pressure characteristic parameter of the clutch is obtained through comparison and indirect obtaining, the learning efficiency is high, interference factors from an engine and a transmission are eliminated, and the learning result is more true and stable.
Description
Technical Field
The invention relates to a current pressure off-line learning method of a hydraulic automatic transmission and a current pressure testing system of the hydraulic automatic transmission.
Background
The hydraulic automatic transmission is a complex system integrating mechanical, hydraulic and electric control into a whole, consists of more than 300 parts, and always performs rotary motion and linear motion in a life cycle. Therefore, with the driving mileage of the whole vehicle and the gear shifting times of the transmission, the gear shifting performance of the transmission will change, and the gear shifting quality will be poor. While the transmission control unit TCU will typically develop an adaptive strategy, it will also be self-regulating over a range of pressures. Otherwise, over-learning is easily caused, and the shift quality is also influenced. For individual transmissions with ultra-poor performance variation and large performance attenuation, the adaptive software of the TCU cannot be covered and good shift quality cannot be guaranteed. The technical method for the transmission is feasible if the current pressure characteristic parameters of the transmission are directly obtained again on the automatic transmission rack through the sensor device and written into TCU software, but the maintenance and test cost of the transmission is very high, the period is very long, and the operability of after-sale maintenance is not achieved.
Disclosure of Invention
In order to make up for the defects, the invention provides the current pressure off-line learning method of the hydraulic automatic transmission, which does not need to increase sensor testing equipment, does not need to disassemble and assemble the transmission, has shorter whole learning period, eliminates some interference factors from an engine and the transmission and can ensure that the learning result is more real and stable.
The technical scheme of the invention is as follows: a current pressure off-line learning method of a hydraulic automatic transmission needs to meet learning conditions in the learning process, and sequentially comprises the following steps:
the method comprises the following steps: current control is carried out on the clutch to be tested and other clutches to form a neutral gear;
step two: calculating torque converter slip n under neutralCV0；
Step three: setting a preset initial learning current to ensure the current I of initial learning0The clutch to be tested can not generate load and output I ═ I0Wherein I is a control current;
step four: controlling the current of the electromagnetic valve to make I equal to I0+ Δ I, where I is the control current;
step five: determining torque converter slip under current I output and torque converter slip under neutral nCV0If the difference is larger than the set threshold value, returning to the fourth step, if the difference is smaller than or equal to the threshold value, and if the difference is larger than the set threshold value, recording the control current I as IRI.e. IREntering the next step;
step six: calculating the current pressure parameter deviation Delta I of the clutchP2C＝IR-IKPIn which IKPThe current value of a preset critical point is calculated according to a preset current pressure characteristic parameter;
step seven: calculating a characteristic parameter I of the current pressure of the clutchP2C＝Ideft+ΔIP2CAnd stored in EEROM, wherein IdeftIs a current pressure characteristic parameter preset by TCU software.
Preferably, the slip n of the torque converter under neutral is calculated in the second stepCV0Time Tck0Slip n of internal torque converterCVIs taken as nCV0。
As a preferred technical scheme, in the third step: current I required to ensure initial learning0The clutch to be tested cannot be loaded, by nCV-nCV0Can characterize the initial current I0Influence on the load if nCV-nCV0Is greater than a set threshold value nthr1Then, the initial current I is described0A load is generated, when the initial current I needs to be reduced0Then reconfirming, i.e. making the initial current I0Decrease in value of Δ I0Then as a new initial current I0Up to an initial current I0The requirement that the clutch to be tested does not generate load is met.
Preferably, in step five, when judging whether the difference between the slip of the torque converter under the control current I output and the slip of the torque converter under the neutral gear is larger than a set threshold value in a set time period, calculating the slip of the torque converter under the control current I output in the set time period Tck1Maximum value n of internal torque converter slipCV_maxAnd nCV0Difference n ofCV_max-nCV0Is less than a set threshold value nthr2According to time Tck1Exit step sizeOtherwise, according to the maximum time TStepExit, at time period TStepLast period of time T inck2Calculating the average value n of the slip of the hydraulic torque converterCV_aveIf the average value n isCV_aveAnd nCV0Difference n ofCV_ave-nCV0Is greater than a set threshold value nthr3If the control current is the critical value of the slip change of the hydraulic torque converter, the control current I is recorded as IROtherwise, returning to the step four.
As a preferred technical solution, the learning condition includes the following:
a. the rotating speed of the output shaft of the transmission is 0;
b. the ATF oil temperature is between 60 and 100 ℃;
c. the throttle is 0;
d. the idle speed of the engine is 700 and 900 rpm;
e. the fluctuation of the engine speed is less than 80 rpm;
f. the TCU has no fault;
g. no brake signal is applied.
Preferably, the shift lever is in the P-range position.
As a preferred embodiment,. DELTA.IP2CThe value of (A) should be within a safe range to avoid the quality being affected by abnormal results.
The invention also provides a current pressure test system of the hydraulic automatic transmission, which does not need to increase sensor test equipment or disassemble and assemble the transmission, has shorter whole learning period, eliminates some interference factors from the engine and the transmission and can ensure that the learning result is more real and stable.
The technical scheme of the invention is as follows: the current pressure test system of the hydraulic automatic transmission comprises a diagnostic instrument with UDS service, wherein an UDS-CAN data line is arranged between the diagnostic instrument and a TCU (transmission control unit), the TCU receives a learning starting request from the diagnostic instrument through the UDS-CAN data line, and the TCU feeds back a process state and a result of learning test to the diagnostic instrument through the UDS-CAN data line; the TCU controls the current of an electromagnetic valve of the transmission through a hard wire, and collects a rotating speed signal, a gear signal and a temperature signal of the transmission in the learning process through the hard wire; the TCU obtains an engine rotating speed signal from an engine control unit through a CAN bus of the whole vehicle.
Due to the adoption of the technical scheme, the current pressure offline learning method of the hydraulic automatic transmission needs to meet learning conditions in the learning process, and sequentially comprises the following steps: the method comprises the following steps: current control is carried out on the clutch to be tested and other clutches to form a neutral gear; step two: calculating torque converter slip n under neutralCV0(ii) a Step three: setting a preset initial learning current to ensure the current I of initial learning0The clutch to be tested can not generate load and output I ═ I0(ii) a Step four: controlling the current of the electromagnetic valve to make I equal to I0+ Δ I; step five: determining torque converter slip under current I output and torque converter slip under neutral nCV0If the difference is larger than the set threshold value, returning to the fourth step, if the difference is smaller than or equal to the threshold value, and if the difference is larger than the set threshold value, recording the control current I as IRI.e. IREntering the next step; step six: calculating the current pressure parameter deviation Delta I of the clutchP2C＝IR-IKPIn which IKPThe current value of a preset critical point is calculated according to a preset current pressure characteristic parameter; step seven: calculating a characteristic parameter I of the current pressure of the clutchP2C＝Ideft+ΔIP2CAnd stored in EEROM, wherein IdeftIs a current pressure characteristic parameter preset by TCU software; sensor test equipment does not need to be added, the speed changer does not need to be disassembled and assembled, the whole learning period is short, interference factors from the engine and the speed changer are eliminated, and the learning result is more real and stable. The actual pressure sensor signal is not required to be directly obtained, and the current pressure characteristic parameter of the clutch is indirectly obtained through comparison by reflecting the load change of the clutch on the change of the slip of the hydraulic torque converter. By adopting the off-line learning method, the learning efficiency is high, the gear shifting performance of the transmission can be directly and truly reflected, and the test method and the result are stable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a current pressure test system of a hydraulic automatic transmission according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for offline learning of current pressure for a hydraulic automatic transmission in accordance with an embodiment of the present invention;
FIG. 3 is a diagram of a clutch current pressure learning process of C1/C2/C3 in an embodiment of the present invention;
FIG. 4 shows the clutch current pressure learning process of B1/C4 in an embodiment of the present invention.
Detailed Description
As shown in fig. 1, the current pressure test system of the hydraulic automatic transmission comprises a diagnostic instrument with UDS service, a UDS-CAN data line is arranged between the diagnostic instrument and the TCU, the TCU receives a request for starting learning from the diagnostic instrument through the UDS-CAN data line, and the TCU feeds back a process state and a result of the learning to the diagnostic instrument through the UDS-CAN data line; the TCU controls the current of an electromagnetic valve of the transmission through a hard wire, and collects a rotating speed signal, a gear signal and a temperature signal of the transmission in the learning process through the hard wire; the TCU obtains an engine rotating speed signal from an engine control unit through a CAN bus of the whole vehicle. Relevant control software is added in a transmission control unit TCU so as to operate the current pressure off-line learning method of the hydraulic automatic transmission.
The off-line learning method of the current pressure of the hydraulic automatic transmission is based on the fact that when an engine is in an idle speed and the transmission is in a neutral gear, the difference between the rotating speed of the engine and the rotating speed of an input shaft of the transmission and the slip of a hydraulic torque converter are in a relatively stable small slip stage, and when the load of the transmission is gradually increased, the slip is also gradually increased. And defining a critical point of the increase of the load of the transmission by searching the critical point of the change of the slip, and comparing the critical point of the load of the transmission with a critical point preset in software to obtain a deviation value of the current pressure characteristic parameter of the clutch. The control process in the learning process of different automatic hydraulic transmissions is different due to different shifting logics of the clutches, but the learning process of each test clutch is the same, so that the method can be applied to all automatic hydraulic transmissions with different structures. In the present embodiment, a clutch shift logic of an 8-speed automatic transmission is described, and table 1 shows current control of the transmission current pressure learning process. The transmission has five shifting clutches B1, C1, C2, C3, C4, and the lockup clutch CV of the torque converter is out of the scope of this study. The transmission can form a fixed gear by combining three clutches, and the combination of less than three clutches is neutral. Learning is required for each shift clutch, and the lockup clutch of the hydraulic transmission must be in an open state during learning, so the CV control current is 0. When B1 is tested and learned, the C2 and C4 clutches are controlled to be in a locking state, namely the control current is 1000mA, the transmission is in a neutral gear state, then the load of the transmission is increased when the current of B1 is gradually increased to a certain value, the slip of the hydraulic torque converter is increased, and the current pressure characteristic parameters of the B1 clutch are learned through the characteristic. When learning C1, C2 and C3, the clutches B1 and C4 are controlled to be in a locking state, namely the control current is 1000mA, when learning C4, the clutches B1 and C2 are controlled to be in a locking state, the control current is 1000mA, and the learning processes of the to-be-tested clutches are the same.
Watch 1
As shown in fig. 2, a method for learning current pressure offline of an automatic hydraulic transmission needs to satisfy learning conditions during learning, and the learning conditions include the following:
a. the rotating speed of the output shaft of the transmission is 0;
b. the ATF oil temperature is between 60 and 100 ℃;
c. the throttle is 0;
d. the idle speed of the engine is 700 and 900 rpm;
e. the fluctuation of the engine speed is less than 80 rpm;
f. the TCU has no fault;
g. no brake signal is stepped on;
h. the shift lever is in the P-range.
And the following steps are carried out in sequence:
the method comprises the following steps: current control is carried out on the clutch to be tested and other clutches to form a neutral gear; in P-range idle, the B1 and C4 are closed, and the other clutches are opened. When the C1/C2/C3 clutch enters the learning process, the B1 and the C4 are in the locking state, so the learning state can be directly entered without the need of switching control of the clutch, as shown in FIG. 3. The B1 and C4 clutches need to be switched, and when the learning process of the B1 clutch is started, the current of the B1 clutch needs to be gradually reduced to 0, and the current of the C2 clutch needs to be gradually increased to 1000mA, as shown in fig. 4. Upon entering the learning process for the C4 clutch, it is desirable to gradually decrease the current to the C4 clutch to 0 while gradually increasing the current to the C2 clutch to 1000 mA. And when the current conversion control is finished, the corresponding neutral gear state of each clutch is entered.
Step two: calculating torque converter slip n under neutralCV0(ii) a In step two, the slip n of the torque converter under neutral gear is calculatedCV0When it is, T will beck0Slip n of internal torque converterCVIs taken as nCV0。
Slip n of torque converterCVCalculating the slip of the converter in neutral for the difference between the engine speed and the speed of the input shaft of the transmission in order to find the base value of the slip break point of the converter, and selecting the time T for the stability of the calculation resultck0Slip n of internal torque converterCVAverage value n ofCV0As shown in fig. 3 and 4.
Step three: setting a preset initial learning current to ensure the current I of initial learning0Can not make the clutch to be tested generate negativeCarry and output I ═ I0(ii) a In step three: current I required to ensure initial learning0The clutch to be tested cannot be loaded, by nCV-nCV0Can characterize the initial current I0Influence on the load if nCV-nCV0Is greater than a set threshold value nthr1Then, the initial current I is described0A load is generated, when the initial current I needs to be reduced0Then reconfirming, i.e. making the initial current I0＝I0-ΔI0Up to an initial current I0The requirement that the clutch to be tested does not generate load is met; in this embodiment,. DELTA.I0And was 20 mA.
Step four: controlling the current of the electromagnetic valve to make I equal to I0+ Δ I; Δ I is 5mA in this example;
step five: determining torque converter slip under current I output and torque converter slip under neutral nCV0Whether the difference value of (A) is greater than a set threshold value n within a set time periodthrIf the threshold value is less than or equal to the threshold value, returning to the step four, if the threshold value is greater than the set threshold value nthrRecording the control current I as IRI.e. IREntering the next step;
in step five, when judging whether the difference value of the slip of the torque converter under the current I output and the slip of the torque converter under the neutral gear is larger than a set threshold value in a set time period, calculating the slip in the set time period Tck1Maximum value n of internal torque converter slipCV_maxAnd nCV0Difference n ofCV_max-nCV0Is less than a set threshold value nthr2According to time Tck1Exiting the step, otherwise according to a maximum time TStepExit, at time period TStepLast period of time T inck2Calculating the average value n of the slip of the hydraulic torque converterCV_aveIf the average value n isCV_aveAnd nCV0Difference n ofCV_ave-nCV0Is greater than a set threshold value nthr3If the current is the critical value of the slip change of the hydraulic torque converter, the control current I is recorded as IROtherwise, returning to the step four.
Step six: calculating the current pressure parameter deviation Delta I of the clutchP2C＝IR-IKPIn which IKPThe current value of a preset critical point is calculated according to a preset current pressure characteristic parameter; delta IP2CThe value of (A) should be within a safe range to avoid the quality being affected by abnormal results.
Step seven: calculating a characteristic parameter I of the current pressure of the clutchP2C＝Ideft+ΔIP2CAnd stored in EEROM, wherein IdeftIs a current pressure characteristic parameter preset by TCU software.
According to the current pressure off-line learning method of the hydraulic automatic transmission, sensor testing equipment does not need to be added, the transmission does not need to be disassembled and assembled, the whole learning period can be completed within three minutes, the function is triggered completely through the function predefined by the diagnostic instrument, and the function is realized through a control strategy developed by a TCU.
The actual pressure sensor signal is not required to be directly obtained, and the current pressure characteristic parameter of the clutch is indirectly obtained through comparison by reflecting the load change of the clutch on the change of the slip of the hydraulic torque converter. By adopting the off-line learning method, the learning efficiency is high, the gear shifting performance of the transmission can be directly and truly reflected, and the test method and the result are stable.
The current pressure learning condition of the clutch provided by the invention is easy to meet, and interference factors from an engine and a transmission are eliminated, so that the learning result is more real and stable. In the learning process, the duration time of each current step is flexibly set based on the slip state of the hydraulic torque converter, so that the learning time can be saved on the premise of ensuring the accuracy of the result.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A current pressure off-line learning method of a hydraulic automatic transmission is characterized in that learning conditions are required to be met in the learning process, and the following steps are sequentially carried out:
the method comprises the following steps: current control is carried out on the clutch to be tested and other clutches to form a neutral gear;
step two: calculating torque converter slip n under neutralCV0；
Step three: setting a preset initial learning current to ensure the current I of initial learning0The clutch to be tested can not generate load and output I ═ I0Wherein I is a control current;
step four: controlling the current of the electromagnetic valve to make I equal to I0+ Δ I, where I is the control current;
step five: determining torque converter slip under current I output and torque converter slip under neutral nCV0If the difference is larger than the set threshold value, returning to the fourth step, if the difference is smaller than or equal to the threshold value, and if the difference is larger than the set threshold value, recording the control current I as IRI.e. IREntering the next step;
step six: calculating the current pressure parameter deviation Delta I of the clutchP2C＝IR-IKPIn which IKPThe current value of a preset critical point is calculated according to a preset current pressure characteristic parameter;
step seven: calculating a characteristic parameter I of the current pressure of the clutchP2C＝Ideft+ΔIP2CAnd stored in EEROM, wherein IdeftIs a current pressure characteristic parameter preset by TCU software.
2. The method for learning current pressure offline of automatic hydraulic transmission according to claim 1, wherein in step two, slip n of the torque converter in neutral is calculatedCV0When in use, willTime Tck0Slip n of internal torque converterCVIs taken as nCV0。
3. The offline learning method of current pressure of a hydraulic automatic transmission according to claim 1, characterized in that in step three: current I required to ensure initial learning0The clutch to be tested cannot be loaded, by nCV-nCV0Can characterize the initial current I0Influence on the load if nCV-nCV0Is greater than a set threshold value nthr1Then, the initial current I is described0A load is generated, when the initial current I needs to be reduced0Then reconfirming, i.e. making the initial current I0Decrease in value of Δ I0Then as a new initial current I0Up to an initial current I0The requirement that the clutch to be tested does not generate load is met.
4. The offline learning method of current pressure of hydraulic automatic transmission according to claim 1, characterized in that, in step five, when judging whether the difference between the slip of the torque converter under control current iout and the slip of the torque converter under neutral is larger than the set threshold value within the set time period, it is calculated for the set time period Tck1Maximum value n of internal torque converter slipCV_maxAnd nCV0Difference n ofCV_max-nCV0Is less than a set threshold value nthr2According to time Tck1Exiting the step, otherwise according to a maximum time TStepExit, at time period TStepLast period of time T inck2Calculating the average value n of the slip of the hydraulic torque converterCV_aveIf the average value n isCV_aveAnd nCV0Difference n ofCV_ave-nCV0Is greater than a set threshold value nthr3If the control current is the critical value of the slip change of the hydraulic torque converter, the control current I is recorded as IROtherwise, returning to the step four.
5. The offline learning method of current pressure of a hydraulic automatic transmission according to claim 1, characterized in that the learning conditions include the following:
a. the rotating speed of the output shaft of the transmission is 0;
b. the ATF oil temperature is between 60 and 100 ℃;
c. the throttle is 0;
d. the idle speed of the engine is 700 and 900 rpm;
e. the fluctuation of the engine speed is less than 80 rpm;
f. the TCU has no fault;
g. no brake signal is applied.
6. The method for learning current pressure offline of a hydraulic automatic transmission according to claim 1, wherein the shift lever position is in P range.
7. The offline learning method of current pressure of a hydraulic automatic transmission according to claim 1, wherein Δ IP2CThe value of (A) should be within a safe range to avoid the quality being affected by abnormal results.
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| CN111473100B (en) * | 2019-01-24 | 2021-12-28 | 联合汽车电子有限公司 | Self-learning method of lockup clutch in hydraulic torque converter |
| CN112362211B (en) * | 2020-10-27 | 2022-02-01 | 北京航空航天大学宁波创新研究院 | Engine predicted torque precision detection method and device and traffic equipment |
| CN113267334A (en) * | 2021-07-19 | 2021-08-17 | 盛瑞传动股份有限公司 | Method and device for judging hydraulic automatic transmission fault, vehicle and storage medium |
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