CN112013047B - Offline detection self-learning method and system for hydraulic system of hybrid power coupling box - Google Patents
Offline detection self-learning method and system for hydraulic system of hybrid power coupling box Download PDFInfo
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- CN112013047B CN112013047B CN202010791392.3A CN202010791392A CN112013047B CN 112013047 B CN112013047 B CN 112013047B CN 202010791392 A CN202010791392 A CN 202010791392A CN 112013047 B CN112013047 B CN 112013047B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/06—Control by electric or electronic means, e.g. of fluid pressure
- F16D48/066—Control of fluid pressure, e.g. using an accumulator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/70—Details about the implementation of the control system
- F16D2500/706—Strategy of control
- F16D2500/70605—Adaptive correction; Modifying control system parameters, e.g. gains, constants, look-up tables
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
Abstract
The application discloses a self-learning method and a system for offline detection of a hydraulic system of a hybrid power coupling box, which relate to the technical field of hydraulic control and comprise the following steps: acquiring a plurality of pressure values of the clutch in pressure-current characteristic self-learning, wherein two adjacent pressure values form a pressure interval; respectively applying each pressure value to the clutch at a first oil temperature, and obtaining the current value of the electromagnetic valve and the rotating speed of the first motor under each pressure value to obtain a pressure-current characteristic curve to be measured; when the difference value between the pressure-current characteristic curve to be measured and the standard pressure-current characteristic curve is smaller than or equal to a preset threshold value, obtaining a rotating speed-pressure correction coefficient of each pressure interval, and then obtaining a second motor rotating speed under each pressure value at a second temperature to obtain a temperature compensation curve; the speed-pressure correction factor and the temperature compensation curve are written into the electrically coupled tank controller. According to the method and the device, the fault screening efficiency is improved, and the segmented pressure interval can be utilized to realize pressure correction and temperature compensation.
Description
Technical Field
The application relates to the technical field of hydraulic control, in particular to an offline detection self-learning method and system for a hydraulic system of a hybrid power coupling box.
Background
At present, an electric coupling box hydraulic system for a hybrid electric vehicle, namely a transmission hydraulic system, is composed of a mechanical part, a hydraulic part and an electric control part, and in the manufacturing process of the vehicle, an End of Line (EOL) detection is usually performed on the electric coupling box hydraulic system to detect the functions and various performances of the transmission. The system pressure has the function of providing main pressure on a main line for the whole hydraulic system so as to meet the pressure requirements of each branch system. The accurate control of the system pressure is the basis for ensuring the normal operation of the whole hydraulic system.
In the related art, the hydraulic system of the electric coupling box is subjected to offline self-learning, and currents under different pressures are tested one by one according to preset pressure step lengths, so that a pressure-current curve is obtained. However, the self-learning process not only needs to measure the current under a plurality of pressures, but also has low detection efficiency, and the EOL data is only the corresponding relationship between the control current and the system pressure measured under specific oil temperature and mechanical pump rotating speed, and when the oil temperature or the mechanical pump rotating speed changes, the corresponding relationship between the current and the system pressure changes, which results in insufficient control accuracy.
Disclosure of Invention
Aiming at the defects in the prior art, the application aims to provide an offline detection self-learning method and system for a hydraulic system of a hybrid electric coupling box, so as to solve the problems of low detection efficiency and low self-learning accuracy in the related art.
The application provides an offline detection self-learning method for a hydraulic system of a hybrid electric coupling box, which comprises the following steps:
acquiring a plurality of pressure values of the clutch in pressure-current characteristic self-learning, wherein two adjacent pressure values form a pressure interval;
respectively applying each pressure value to the clutch at a first oil temperature, and obtaining the current value of the electromagnetic valve and the rotating speed of the first motor under each pressure value to obtain a pressure-current characteristic curve to be measured;
when the difference value between the pressure-current characteristic curve to be measured and the standard pressure-current characteristic curve is smaller than or equal to a preset threshold value, obtaining a rotating speed-pressure correction coefficient of each pressure interval according to each pressure value and the corresponding first motor rotating speed, then obtaining the second motor rotating speed under each pressure value at a second temperature, and obtaining a temperature compensation curve according to the pressure value, the first motor rotating speed and the second motor rotating speed;
and writing the rotation speed-pressure correction coefficient and the temperature compensation curve into an electric coupling box controller for controlling and compensating the rotation speed of the motor.
In some embodiments, the pressure values include the clutch from small to largePressure value P in semi-bonding state1The pressure value P of the clutch in the combined state2The combined pressure value P when the output of the clutch is at the maximum transmission torque3And the maximum allowable pressure value P when the clutch is in the engaged state4。
In some embodiments, after obtaining the pressure-current characteristic curve to be measured, the method further includes:
obtaining a plurality of current standard values corresponding to the pressure values according to the stored standard pressure-current characteristics;
and respectively calculating the difference value between the current value and the current standard value under each pressure value, and comparing the difference value with the preset threshold value.
In some embodiments, when the difference between the pressure-current characteristic curve to be measured and the standard pressure-current characteristic curve is greater than a preset threshold, it is determined that the hydraulic system of the hybrid electric coupling box is abnormal.
In some embodiments, obtaining the rotation speed-pressure correction coefficient of each pressure interval according to each pressure value and the corresponding first motor rotation speed includes:
taking the difference value between the maximum pressure value and the minimum pressure value of a certain pressure interval as the pressure difference of the pressure interval, and taking the difference value between the first motor rotating speed corresponding to the maximum pressure value and the first motor rotating speed corresponding to the minimum pressure value of the pressure interval as the rotating speed difference of the pressure interval;
and taking the ratio of the pressure difference to the rotating speed difference of the pressure interval as the rotating speed-pressure correction coefficient of the pressure interval.
In some embodiments, obtaining the temperature compensation curve according to the pressure value, the first motor speed, and the second motor speed specifically includes:
taking the difference value of the rotating speed of the second motor and the rotating speed of the first motor under any pressure value as the rotating speed difference of the pressure value, and taking the ratio of the pressure value to the corresponding rotating speed difference as the temperature compensation coefficient corresponding to the second oil temperature under the pressure value;
calculating to obtain a temperature compensation slope and a temperature compensation offset of a corresponding pressure interval according to the temperature compensation coefficients under two adjacent pressure values;
and obtaining the temperature compensation curve according to the temperature compensation slope and the temperature compensation offset of each pressure interval.
In some embodiments, after applying each of the pressure values to the clutch, the method further includes: and keeping the pressure value for a preset time.
The application provides in a second aspect an offline detection self-learning system for a hybrid electric coupling box hydraulic system, comprising:
the clutch is connected with a motor of the oil pump;
an electromagnetic valve provided in the clutch, the electromagnetic valve being configured to control a pressure value of the clutch;
the memory is used for accessing a plurality of acquired pressure values of the self-learning clutch pressure-current characteristic and a pressure interval formed by two adjacent pressure values;
the electric coupling box controller is respectively connected with the clutch, the electromagnetic valve, the memory and the motor, and is used for respectively applying each pressure value to the clutch at a first oil temperature to obtain the current value of the electromagnetic valve and the rotating speed of the first motor at each pressure value so as to obtain a pressure-current characteristic curve to be measured; the temperature compensation device is also used for obtaining a rotating speed-pressure correction coefficient of each pressure interval according to each pressure value and the corresponding first motor rotating speed when the difference value of the pressure-current characteristic curve to be measured and the standard pressure-current characteristic curve is smaller than or equal to a preset threshold value, then obtaining the second motor rotating speed under each pressure value at a second oil temperature, and obtaining a temperature compensation curve according to the pressure value, the first motor rotating speed and the second motor rotating speed;
the electric coupling box controller is also used for storing the rotating speed-pressure correction coefficient and the temperature compensation curve and carrying out control compensation on the rotating speed of the motor.
In some embodiments, the memory is further configured to store a clutch reference pressure-current characteristic;
the electric coupling box controller is also used for comparing the pressure-current characteristic curve to be measured with a standard pressure-current characteristic curve.
In some embodiments, the system further includes a rotation speed sensor for acquiring a rotation speed of the motor, and a current sensor for acquiring a current value of the solenoid valve.
The beneficial effect that technical scheme that this application provided brought includes:
according to the offline detection self-learning method and system for the hybrid power electric coupling box hydraulic system, a plurality of pressure values for self-learning of the pressure-current characteristic of a clutch in the electric coupling box hydraulic system are obtained in advance to form a plurality of pressure intervals, each pressure value is applied to the clutch at a first oil temperature to obtain the current value of an electromagnetic valve and the rotating speed of a first motor at each pressure value, a pressure-current characteristic curve to be detected can be obtained quickly, the obtained pressure-current characteristic curve to be detected is compared with a standard pressure-current characteristic curve, and whether the clutch has a fault or not can be determined; when no fault exists, the rotating speed-pressure correction coefficient of each pressure interval can be obtained according to each pressure value and the corresponding rotating speed of the first motor, then the rotating speed of the second motor under each pressure value at a second temperature is obtained, the temperature compensation curve for clutch pressure control is obtained according to the pressure value, the rotating speed of the first motor and the rotating speed of the second motor, after the rotating speed-pressure correction coefficient and the temperature compensation curve are written into the electric coupling box controller, the electric coupling box controller can obtain the reference rotating speed through the rotating speed-pressure correction coefficient, and then the reference rotating speed is compensated through the temperature compensation curve.
Drawings
FIG. 1 is a first flowchart of an offline detection self-learning method for a hybrid electric coupling box hydraulic system according to an embodiment of the present application;
FIG. 2 is a second flowchart of an offline detection self-learning method for a hydraulic system of a hybrid electric coupling box according to an embodiment of the present application.
Detailed Description
The present application will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1, an embodiment of the present application provides an offline detection self-learning method for a hydraulic system of a hybrid electric coupling box, where the method includes the following steps:
s1, obtaining a plurality of pressure values of self-learning of pressure-current characteristics of a clutch in the electric coupling box hydraulic system, wherein two adjacent pressure values form a pressure interval.
And S2, respectively applying the pressure values to the clutch at a first oil temperature, and obtaining the current value of the electromagnetic valve and the rotating speed of the first motor under the pressure values to obtain a pressure-current characteristic curve to be measured.
And S3, when the difference value between the pressure-current characteristic curve to be measured and the standard pressure-current characteristic curve is smaller than or equal to a preset threshold value, obtaining a rotating speed-pressure correction coefficient of each pressure interval according to each pressure value and the corresponding first motor rotating speed, then obtaining the second motor rotating speed under each pressure value at a second temperature, and obtaining a temperature compensation curve according to the pressure value, the first motor rotating speed and the second motor rotating speed.
And S4, writing the rotating speed-pressure correction coefficient and the temperature compensation curve into an electric coupling box controller for controlling and compensating the rotating speed of the motor. Specifically, the electric coupling box controller can obtain the reference rotating speed of the motor through the current pressure and the rotating speed-pressure correction coefficient of the clutch, and then compensate the reference rotating speed through a temperature compensation curve to obtain the output rotating speed of the motor.
According to the offline detection self-learning method for the hydraulic system of the hybrid power electric coupling box, under the first oil temperature, each pressure value is applied to the clutch respectively, the current value of the electromagnetic valve and the rotating speed of the first motor under each pressure value are obtained, the pressure-current characteristic curve to be detected can be obtained quickly, the obtained pressure-current characteristic curve to be detected is compared with the standard pressure-current characteristic curve, and whether the clutch has a fault or not can be determined; when no fault exists, the rotating speed-pressure correction coefficient of each pressure interval can be obtained according to each pressure value and the corresponding rotating speed of the first motor, then the rotating speed of the second motor under each pressure value at a second temperature is obtained, the temperature compensation curve for clutch pressure control is obtained according to the pressure value, the rotating speed of the first motor and the rotating speed of the second motor, after the rotating speed-pressure correction coefficient and the temperature compensation curve are written into the electric coupling box controller, the electric coupling box controller can obtain the reference rotating speed through the rotating speed-pressure correction coefficient, and then the reference rotating speed is compensated through the temperature compensation curve.
Preferably, the plurality of pressure values includes four pressure values, specifically including a half-engagement point pressure value at which the clutch is in a half-engaged state, an engagement pressure value at an engaged state at which the clutch is fully closed, an engagement pressure value at which the clutch is at a maximum transmission torque, and a maximum allowable pressure value at which the clutch is in an engaged state. The four pressure values are all within the allowable pressure range of the clutch design.
In step S2, the method further includes, after applying the pressure values to the clutches, respectively: and keeping the pressure value for a preset time, and then reading a current value corresponding to the pressure value and the rotating speed of the motor. Optionally, the preset holding time is 5 s.
In this embodiment, after the to-be-tested electric coupling box hydraulic system enters the offline detection table, a self-learning process at room temperature is performed according to the plurality of pressure values, and the oil temperature at this time is taken as the first oil temperature T0And respectively obtaining current values corresponding to the four pressure values and the first motor rotating speed, wherein the results are shown in the following table 1.
TABLE 1
In this embodiment, after obtaining the pressure-current characteristic curve to be measured in step S2, the method further includes:
firstly, obtaining a plurality of current standard values corresponding to the pressure values according to standard pressure-current characteristics stored in a database standard component.
And then, respectively calculating the difference value between the current value and the current standard value under each pressure value, and comparing the difference value between the current value and the current standard value with the preset threshold value one by one. When any difference value is larger than a preset threshold value, the difference value between the pressure-current characteristic curve to be tested and the standard pressure-current characteristic curve is larger than the preset threshold value, an abnormal sample is screened, and the abnormal situation of the hydraulic system of the hybrid electric coupling box to be tested is judged, and an abnormal sample processing flow needs to be entered.
And when the difference value between each current value and the corresponding current standard value is less than or equal to the preset threshold value, judging that the tested hydraulic system is normal, and entering a rotating speed-pressure correction self-learning process.
Preferably, in step S3, obtaining the rotation speed-pressure correction coefficient for each pressure interval according to each pressure value and the corresponding first motor rotation speed includes:
first, the difference between the maximum pressure value and the minimum pressure value in a certain pressure interval is used as the pressure difference in the pressure interval.
Then, the difference value between the first motor rotating speed corresponding to the maximum pressure value and the first motor rotating speed corresponding to the minimum pressure value in the pressure interval is used as the rotating speed difference of the pressure interval.
And finally, taking the ratio of the pressure difference to the rotating speed difference as a rotating speed-pressure correction coefficient of the pressure interval.
In this embodiment, the pressure interval includes P1-P2、P2-P3And P3-P4And the rotating speed and the pressure of each pressure interval are in a linear relation. Wherein, P1-P2Pressure interval (clutch current pressure not less than P)1And is less than P2) Speed-pressure correction coefficient K of1Comprises the following steps:
P2-P3pressure interval (clutch current pressure not less than P)2And is less than P3) Speed-pressure correction coefficient K of2Comprises the following steps:
P3-P4pressure interval (clutch current pressure not less than P)3And is not greater than P4) Speed-pressure correction coefficient K of3Comprises the following steps:
respectively apply the correction coefficients K1、K2And K3And writing the reference point into the electric coupling box controller for storage, namely obtaining the reference point of PID control regulation under the rotating speed-pressure of the section oil pressure request section of the electric coupling box controller, namely obtaining the reference rotating speed of the motor according to the current pressure and the corresponding rotating speed-pressure correction coefficient after determining the pressure section of the current pressure of the clutch.
In step S3, obtaining a temperature compensation curve according to the pressure value, the first motor speed, and the second motor speed, specifically including:
firstly, the difference value of the second motor rotating speed and the first motor rotating speed at any pressure value is used as the rotating speed difference of the pressure value, and the ratio of the pressure value to the corresponding rotating speed difference is used as the temperature compensation coefficient corresponding to the second oil temperature at the pressure value.
Then, because the oil temperature and the temperature compensation coefficient are in a linear relationship in each pressure interval, the temperature compensation slope and the temperature compensation offset of the pressure interval can be calculated according to the linear relationship and the temperature compensation coefficients at two adjacent pressure values.
And finally, obtaining the temperature compensation curve according to the temperature compensation slope and the temperature compensation offset of each pressure interval.
In this embodiment, the first oil temperature T0Is oil temperature in room temperature environment, and the second oil temperature T1Is greater than the first oil temperature T0。
Referring to Table 2 below, the second oil temperature T1Lower, pressure value P1Corresponding second motor speed N5Pressure value P2Corresponding second motor speed N6Pressure value P3Corresponding second motor speed N7Pressure value P4Corresponding second motor speed N8。
TABLE 2
Wherein, P1-P2Temperature compensation slope a of the pressure interval of1And a temperature compensation offset b1Respectively as follows:
ΔN1＝N5-N1
ΔN2＝N6-N2
P2-P3temperature compensation slope a of the pressure interval of2And a temperature compensation offset b2Respectively as follows:
ΔN3＝N7-N3
P3-P4temperature compensation slope a of the pressure interval of3And a temperature compensation offset b3Respectively as follows:
ΔN4＝N8-N4
in this embodiment, each of the temperature compensation slopes and the temperature compensation offsets is written into the electric coupling box controller to be used as a temperature compensation linear equation during the clutch pressure control. Namely, the temperature compensation curve of the clutch pressure control is as follows:
wherein y is a temperature compensation coefficient, x is an oil temperature, and P is a current clutch pressure.
After the electric coupling box controller determines the pressure interval of the current pressure of the clutch, the reference rotating speed can be compensated according to the corresponding temperature compensation curve, and the output rotating speed of the motor is obtained.
Referring to fig. 2, the offline detection self-learning method of the embodiment specifically includes:
A1. acquiring a plurality of pressure values of clutch pressure-current characteristic self-learning to form a plurality of pressure intervals;
A2. respectively applying each pressure value to the clutch at a first oil temperature, and obtaining the current value of the electromagnetic valve and the rotating speed of the first motor under each pressure value to obtain a pressure-current characteristic curve to be measured;
A3. judging whether the difference value between the pressure-current characteristic curve to be detected and the standard pressure-current characteristic curve is smaller than or equal to a preset threshold value, if so, turning to A4, otherwise, turning to A7;
A4. calculating a rotating speed-pressure correction coefficient of each pressure interval;
A5. acquiring the rotating speed of a second motor corresponding to the minimum value of each pressure interval at a second oil temperature;
A6. a temperature compensation curve for clutch pressure control is obtained, and the speed-pressure correction factor and the temperature compensation curve are written into an electrically coupled tank controller.
A7. And entering an abnormal sample processing flow.
The embodiment of the application also provides an offline detection self-learning system of the hydraulic system of the hybrid electric coupling box.
The clutch is connected with a motor of the oil pump. The electromagnetic valve is arranged in the clutch and used for controlling the pressure value of the clutch through oil filling/draining.
The memory is used for accessing a plurality of acquired pressure values of the self-learning clutch pressure-current characteristic and a plurality of pressure intervals formed by the pressure values.
The electric coupling box controller is respectively connected with the clutch, the solenoid valve, the memory and the motor of the oil pump. And the electric coupling box controller is used for applying each pressure value to the clutch respectively at a first oil temperature, obtaining the current value of the electromagnetic valve and the rotating speed of the first motor under each pressure value, and obtaining a pressure-current characteristic curve to be measured. The electric coupling box controller is also used for obtaining a rotating speed-pressure correction coefficient of each pressure interval according to each pressure value and the corresponding first motor rotating speed when the difference value of the pressure-current characteristic curve to be measured and the standard pressure-current characteristic curve is smaller than or equal to a preset threshold value, then obtaining a second motor rotating speed under each pressure value at a second oil temperature, and obtaining a temperature compensation curve according to the pressure value, the first motor rotating speed and the second motor rotating speed.
The electric coupling box controller is also used for storing a rotating speed-pressure correction coefficient and a temperature compensation curve and carrying out control compensation on the rotating speed of the motor.
In this embodiment, the memory is further configured to store a clutch reference pressure-current characteristic. The electric coupling box controller is also used for comparing the pressure-current characteristic curve to be measured with a standard pressure-current characteristic curve so as to judge whether the electric coupling box hydraulic system is normal or not.
In this embodiment, the system further includes a rotation speed sensor and a current sensor, the rotation speed sensor is configured to acquire a rotation speed of the motor, and the current sensor is configured to acquire a current value of the electromagnetic valve.
The offline detection self-learning system is suitable for the methods, a pressure-current characteristic curve to be detected of the clutch, a rotating speed-pressure correction coefficient and a temperature compensation curve in different pressure intervals can be obtained through fitting by selecting the pressure values of the four key pressure points, on one hand, the troubleshooting efficiency can be improved, on the other hand, control of different parameters in different pressure intervals can be achieved, and further the clutch can be controlled more accurately.
The present application is not limited to the above embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present application, and such modifications and improvements are also considered to be within the scope of the present application.
Claims (10)
1. An offline detection self-learning method for a hydraulic system of a hybrid electric coupling box is characterized by comprising the following steps of:
acquiring a plurality of pressure values of the clutch in pressure-current characteristic self-learning, wherein two adjacent pressure values form a pressure interval;
respectively applying each pressure value to the clutch at a first oil temperature, and obtaining the current value of the electromagnetic valve and the rotating speed of the first motor under each pressure value to obtain a pressure-current characteristic curve to be measured;
when the difference value between the pressure-current characteristic curve to be measured and the standard pressure-current characteristic curve is smaller than or equal to a preset threshold value, obtaining a rotating speed-pressure correction coefficient of each pressure interval according to each pressure value and the corresponding first motor rotating speed, then obtaining the second motor rotating speed under each pressure value at a second temperature, and obtaining a temperature compensation curve according to the pressure value, the first motor rotating speed and the second motor rotating speed;
and writing the rotation speed-pressure correction coefficient and the temperature compensation curve into an electric coupling box controller for controlling and compensating the rotation speed of the motor.
2. The off-line detection self-learning method of a hybrid electric coupling box hydraulic system of claim 1, wherein: the pressure values from small to large comprise the pressure value P of the clutch in a semi-combined state1Pressure value P of the clutch in the engaged state2A combined pressure value P at which the clutch output is at maximum transmission torque3And a maximum allowable pressure value P when the clutch is in an engaged state4。
3. The offline detection self-learning method for the hydraulic system of the hybrid electric coupling box according to claim 1, wherein after obtaining the pressure-current characteristic curve to be measured, the method further comprises the following steps:
obtaining current standard values corresponding to a plurality of pressure values according to the stored standard pressure-current characteristics;
and respectively calculating the difference value between the current value and the current standard value under each pressure value, and comparing the difference value with the preset threshold value.
4. The off-line detection self-learning method of a hybrid electric coupling box hydraulic system of claim 1, wherein: and when the difference value between the pressure-current characteristic curve to be measured and the standard pressure-current characteristic curve is larger than a preset threshold value, judging that the hydraulic system of the hybrid electric coupling box is abnormal.
5. The offline detection self-learning method for the hydraulic system of the hybrid electric coupling box according to claim 1, wherein the step of obtaining the speed-pressure correction coefficient of each pressure interval according to each pressure value and the corresponding first motor speed specifically comprises the following steps:
taking the difference value between the maximum pressure value and the minimum pressure value of a certain pressure interval as the pressure difference of the pressure interval, and taking the difference value between the first motor rotating speed corresponding to the maximum pressure value and the first motor rotating speed corresponding to the minimum pressure value of the pressure interval as the rotating speed difference of the pressure interval;
and taking the ratio of the pressure difference to the rotating speed difference of the pressure interval as the rotating speed-pressure correction coefficient of the pressure interval.
6. The offline detection self-learning method for the hydraulic system of the hybrid electric coupling box according to claim 1, wherein obtaining a temperature compensation curve according to the pressure value, the first motor speed and the second motor speed specifically comprises:
taking the difference value of the rotating speed of the second motor and the rotating speed of the first motor under any pressure value as the rotating speed difference of the pressure value, and taking the ratio of the pressure value to the corresponding rotating speed difference as the temperature compensation coefficient corresponding to the second oil temperature under the pressure value;
calculating to obtain a temperature compensation slope and a temperature compensation offset of a corresponding pressure interval according to the temperature compensation coefficients under two adjacent pressure values;
and obtaining the temperature compensation curve according to the temperature compensation slope and the temperature compensation offset of each pressure interval.
7. The off-line detection self-learning method of a hybrid electric coupling box hydraulic system of claim 1, further comprising, after applying each of the pressure values to the clutch, respectively:
and keeping the pressure value for a preset time.
8. An offline detection self-learning system for a hydraulic system of a hybrid electric coupling box, comprising:
the clutch is connected with a motor of the oil pump;
the electromagnetic valve is arranged in the clutch and used for controlling the pressure value of the clutch;
the memory is used for accessing a plurality of acquired pressure values of the self-learning clutch pressure-current characteristic and a pressure interval formed by two adjacent pressure values;
the electric coupling box controller is respectively connected with the clutch, the electromagnetic valve, the memory and the motor, and is used for respectively applying each pressure value to the clutch at a first oil temperature to obtain the current value of the electromagnetic valve and the rotating speed of the first motor at each pressure value so as to obtain a pressure-current characteristic curve to be measured; the temperature compensation device is also used for obtaining a rotation speed-pressure correction coefficient of each pressure interval according to each pressure value and the corresponding first motor rotation speed when the difference value between the pressure-current characteristic curve to be detected and the standard pressure-current characteristic curve is smaller than or equal to a preset threshold value, then obtaining the second motor rotation speed under each pressure value at a second oil temperature, and obtaining a temperature compensation curve according to the pressure value, the first motor rotation speed and the second motor rotation speed;
the electric coupling box controller is also used for storing the rotating speed-pressure correction coefficient and the temperature compensation curve and carrying out control compensation on the rotating speed of the motor.
9. The hybrid electric coupling box hydraulic system offline detection self-learning system of claim 8, wherein:
the memory is also used for storing a standard pressure-current characteristic of the clutch;
the electric coupling box controller is also used for comparing the pressure-current characteristic curve to be measured with a standard pressure-current characteristic curve.
10. The hybrid electric coupling box hydraulic system offline detection self-learning system of claim 8, wherein: the system further comprises a rotating speed sensor and a current sensor, wherein the rotating speed sensor is used for collecting the rotating speed of the motor, and the current sensor is used for collecting the current value of the electromagnetic valve.
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