CN111350773B - Pressure compensation control method and system of clutch and vehicle - Google Patents
Pressure compensation control method and system of clutch and vehicle Download PDFInfo
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- CN111350773B CN111350773B CN201811581429.9A CN201811581429A CN111350773B CN 111350773 B CN111350773 B CN 111350773B CN 201811581429 A CN201811581429 A CN 201811581429A CN 111350773 B CN111350773 B CN 111350773B
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H2061/0075—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by a particular control method
- F16H2061/0087—Adaptive control, e.g. the control parameters adapted by learning
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Transmission Device (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
Abstract
The invention provides a pressure compensation control method and system of a clutch and a vehicle, wherein the method comprises the following steps: acquiring vehicle running information, at least comprising: engine torque, rate of change of engine torque, engine speed, speed acceleration of the transmission output shaft; judging whether the vehicle is in a constant or acceleration working condition or not according to the vehicle running information; if so, calculating the time difference between the inflection point moment of the engine speed after gear shifting and the end moment of the preset target torque interaction stage during power upshift control; determining an engine torque value corresponding to the moment of the inflection point of the engine speed, and obtaining a pressure compensation value of the clutch according to the engine torque value and a time difference value; and performing pressure compensation control on the clutch according to the pressure compensation value. The method can compensate the pressure of the clutch, accurately correct the control data of the processing error of the clutch, and learn and optimize the gear shifting quality, thereby meeting the requirement of a driver on the gear shifting comfort.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a pressure compensation control method and system of a clutch and a vehicle.
Background
With the popularization of automatic transmission vehicles, the requirement of people on driving comfort is higher and higher. The host factory and the transmission manufacturer repeatedly calibrate the gear shifting quality in order to meet the requirements of drivers.
However, due to the processing error of hardware, the coverage capability of software data is poor, so that the problem of different gear shifting qualities of the same control data is caused, and the gear shifting comfort of the vehicle is influenced.
Disclosure of Invention
In view of the above, the present invention is directed to a pressure compensation control method for a clutch, which can perform pressure compensation on the clutch, so as to accurately correct control data of a processing error of the clutch, and perform learning optimization on shift quality, thereby meeting a driver's requirement for shift comfort.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a pressure compensation control method of a clutch, comprising the steps of: acquiring vehicle running information, wherein the vehicle running information at least comprises: engine torque, rate of change of engine torque, engine speed, speed acceleration of the transmission output shaft; judging whether the vehicle is in a constant or acceleration working condition or not according to the vehicle running information; if so, calculating the time difference between the inflection point moment of the engine speed after gear shifting and the end moment of the preset target torque interaction stage during power upshift control; determining an engine torque value corresponding to the engine speed inflection point moment, and obtaining a pressure compensation value of the clutch according to the engine torque value corresponding to the engine speed inflection point moment and the time difference value; and performing pressure compensation control on the clutch according to the pressure compensation value.
Further, obtaining a pressure compensation value of the clutch according to the engine torque value corresponding to the engine speed inflection point time and the time difference, further comprising: and obtaining a pressure compensation value of the clutch by inquiring a preset torque-time-pressure relation mapping table according to the engine torque value and the time difference value corresponding to the engine rotating speed inflection point moment, wherein the torque-time-pressure relation mapping table comprises a plurality of groups of mutual corresponding relations of torque, time and pressure, and the mutual corresponding relations of the plurality of groups of torque, time and pressure at least comprise corresponding relations among the engine torque value, the time difference and the pressure compensation value corresponding to the engine rotating speed inflection point moment.
Further, still include: judging whether the pressure compensation value is larger than a preset pressure compensation upper limit value or smaller than a preset pressure compensation lower limit value; if the pressure compensation value is larger than the pressure compensation upper limit value, performing pressure compensation control on the non-working clutch according to the pressure compensation upper limit value; and if the pressure compensation value is smaller than the lower pressure compensation limit value, performing pressure compensation control on the non-working clutch according to the lower pressure compensation limit value.
Further, before calculating a time difference between an inflection point time of the engine speed after the gear shifting and an end time of the preset target torque interaction phase, the method further comprises the following steps: and judging whether a clutch needing pressure compensation control exists or not according to the current gear information.
Further, whether the vehicle is in a constant or acceleration condition is judged according to the vehicle running information, and the method further comprises the following steps: and if the engine torque is in a preset torque range, the engine torque change rate is in a preset torque change rate range, the engine rotating speed is in a preset rotating speed range, and the rotating speed acceleration of the output shaft of the transmission is in a preset acceleration range, judging that the vehicle is in a constant or acceleration working condition.
Compared with the prior art, the pressure compensation control method of the clutch has the following advantages:
the pressure compensation control method of the clutch obtains vehicle running information, judges whether the vehicle is in a constant or accelerating working condition according to the vehicle running information, when the vehicle is in the constant or accelerating working condition, calculates the time difference value between the inflection point moment of the engine rotating speed after gear shifting and the preset target torque interaction stage ending moment during power upshift control, obtains the pressure compensation value of the clutch according to the engine torque value and the time difference value corresponding to the inflection point moment of the engine rotating speed, and performs pressure compensation control on the clutch according to the pressure compensation value, thereby accurately correcting the control data of the processing error of the clutch, learning and optimizing the gear shifting quality, and further meeting the requirement of a driver on the gear shifting comfort.
Another objective of the present invention is to provide a pressure compensation control system for a clutch, which can perform pressure compensation on the clutch, so as to accurately correct the control data of the processing error of the clutch, and perform learning optimization on the gear shifting quality, thereby meeting the requirement of the driver on the gear shifting comfort.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a pressure compensating control system for a clutch, comprising: an obtaining module, configured to obtain vehicle driving information, where the vehicle driving information at least includes: engine torque, rate of change of engine torque, engine speed, speed acceleration of the transmission output shaft; the judging module is used for judging whether the vehicle is in a constant or acceleration working condition or not according to the vehicle running information; the calculation module is used for calculating the time difference between the inflection point moment of the engine speed after gear shifting and the end moment of the preset target torque interaction stage when the vehicle is in a constant or acceleration working condition and the power is subjected to gear shifting control; the determining module is used for determining an engine torque value corresponding to the engine speed inflection point moment and obtaining a pressure compensation value of the clutch according to the engine torque value corresponding to the engine speed inflection point moment and the time difference value; and the control module is used for carrying out pressure compensation control on the clutch according to the pressure compensation value.
Further, the determination module is to: and obtaining a pressure compensation value of the clutch by inquiring a preset torque-time-pressure relation mapping table according to the engine torque value and the time difference value corresponding to the engine rotating speed inflection point moment, wherein the torque-time-pressure relation mapping table comprises a plurality of groups of mutual corresponding relations of torque, time and pressure, and the mutual corresponding relations of the plurality of groups of torque, time and pressure at least comprise corresponding relations among the engine torque value, the time difference and the pressure compensation value corresponding to the engine rotating speed inflection point moment.
Further, the control module is further configured to: judging whether the pressure compensation value is larger than a preset pressure compensation upper limit value or smaller than a preset pressure compensation lower limit value; when the pressure compensation value is larger than the pressure compensation upper limit value, performing pressure compensation control on the non-working clutch according to the pressure compensation upper limit value; and when the pressure compensation value is smaller than the lower pressure compensation limit value, performing pressure compensation control on the non-working clutch according to the lower pressure compensation limit value.
Further, the determining module is further configured to: and judging whether a clutch needing pressure compensation control exists or not according to the current gear information.
Compared with the prior art, the pressure compensation control system of the clutch and the pressure compensation control method of the clutch have the same advantages, and the detailed description is omitted.
Another object of the present invention is to provide a vehicle, which can perform pressure compensation on a clutch, so as to accurately correct control data of a clutch machining error, and perform learning optimization on gear shifting quality, thereby meeting the requirement of a driver on gear shifting comfort.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a vehicle is provided with a pressure compensation control system of a clutch as described in the above embodiments.
The vehicle and the pressure compensation control system of the clutch have the same advantages compared with the prior art, and the detailed description is omitted.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of clutch pressure on the engagement side versus engine speed during an ideal shift;
FIG. 2 is a schematic diagram of an engine speed inflection point coinciding with an end point of a target clutch torque interaction phase in an ideal state;
FIG. 3 is a schematic diagram of an engine speed inflection point earlier than an end of a target on-coming clutch torque interaction phase;
FIG. 4 is a schematic diagram of an engine speed inflection point later than an end of a target apply-side clutch torque interaction phase;
FIG. 5 is a flow chart of a method of pressure compensation control of a clutch according to one embodiment of the present invention;
fig. 6 is a block diagram of a pressure compensation control system for a clutch according to an embodiment of the present invention.
Description of reference numerals:
the system includes a pressure compensation control system 100 for a clutch, an acquisition module 110, a determination module 120, a calculation module 130, a determination membrane 140, and a control module 150.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The basic principle of power on upshift is first described with reference to fig. 1. Specifically, power upshift control belongs to a condition of clutch overlap control (clutch to clutch), which means that one of the operating clutches is opened during an upshift and a non-operating clutch is engaged instead of the opened clutch, thereby achieving the purpose of an upshift. As shown in fig. 1, a power upshift is mainly divided into three phases: a clutch application preparation phase (kiss point); a torque interaction stage; an inertia torque phase. Wherein the clutch on the disengagement side is completely disengaged at the end of the torque interaction phase and no more torque is transmitted.
Next, the basic principle of the present invention for self-learning the clutch during an upshift is described with reference to FIG. 2. As shown in fig. 2, when the vehicle is in a power upshift stage (accelerator upshift power upshift), that is, when the transmission gear is subjected to upshift control according to the vehicle speed and the accelerator size, the current actual stage of the engagement-side clutch is determined according to an inflection point at which the engine speed rises and then falls after the start of gear shifting (the torque interaction stage is transitioned to the inertia torque stage). The machining error of the engaging clutch is calculated by comparing the target control time and the actual execution time of the torque interaction phase, and an appropriate self-learning value is obtained. The learned value is applied when the next engagement point (kiss point) pressure of the clutch is calculated, and finally an ideal shift control state is achieved. This is shown in fig. 2, which is the case where the engine speed inflection point coincides with the target torque interaction phase end point. Further, as shown in fig. 3, a case where the engine speed inflection point is earlier than the end point of the target torque interaction phase is demonstrated, i.e., the engine speed inflection point is too early. As shown in fig. 4, a case where the engine speed inflection point is later than the end point of the target torque interaction phase, that is, the engine speed inflection point is too late, is demonstrated. According to the clutch overlapping control principle, when the pressure control of the clutch on the separation side is determined (the clutch on the separation side is completely separated and no torque is transmitted at the end point of the target torque interaction phase), if the inflection point of the engine speed is earlier than the end point of the target torque interaction phase (namely the inflection point of the engine speed is too early), the pressure of the clutch on the engagement side is proved to be overlarge, and the pressure learning value of the clutch on the engagement side is negative; otherwise, if the engine speed inflection point is later than the target torque interaction phase end point (i.e., if the engine speed inflection point is too late), it is verified that the engaging side clutch pressure is too small, and the engaging side clutch pressure learning value is positive.
Based on this, fig. 5 is a flowchart of a pressure compensation control method of a clutch according to one embodiment of the invention.
As shown in fig. 5, a pressure compensation control method of a clutch according to an embodiment of the present invention includes the steps of:
step S1: acquiring vehicle running information, wherein the vehicle running information at least comprises: engine torque, rate of change of engine torque, engine speed, rotational speed acceleration of the transmission output shaft.
Step S2: and judging whether the vehicle is in a constant or acceleration working condition or not according to the vehicle running information.
Step S3: if yes (namely the vehicle is in a constant or acceleration condition), calculating the time difference value between the inflection point moment of the engine speed after gear shifting and the end moment of the preset target torque interaction phase in the power upshift control. Specifically, the time difference is the engine speed inflection point time-the target torque interaction phase end time.
Step S4: and determining an engine torque value corresponding to the engine speed inflection point moment, and obtaining a pressure compensation value of the clutch according to the engine torque value corresponding to the engine speed inflection point moment and a time difference value.
Step S5: and performing pressure compensation control on the clutch according to the pressure compensation value.
That is, the method comprises the steps of obtaining vehicle running information, judging whether a vehicle is in a constant or accelerating working condition according to the vehicle running information, calculating a time difference value between an engine rotating speed inflection point moment after gear shifting and a preset target torque interaction phase ending moment when the vehicle is in the constant or accelerating working condition during power upshift control, obtaining a pressure compensation value of a clutch according to an engine torque value and the time difference value corresponding to the engine rotating speed inflection point moment, and performing pressure compensation control on the clutch according to the pressure compensation value, so that control data of a clutch processing error are accurately corrected, the gear shifting quality is learned and optimized, and the requirement of a driver on gear shifting comfort is further met.
Specifically, in an embodiment of the present invention, obtaining a pressure compensation value of the clutch according to an engine torque value corresponding to an inflection point of an engine speed and a time difference value, further includes: and obtaining a pressure compensation value of the clutch by inquiring a preset torque-time-pressure relation mapping table according to the engine torque value and the time difference value corresponding to the engine rotating speed inflection point moment, wherein the torque-time-pressure relation mapping table comprises a plurality of groups of mutual corresponding relations of torque, time and pressure, and the mutual corresponding relations of the plurality of groups of torque, time and pressure at least comprise the corresponding relations among the engine torque value, the time difference and the pressure compensation value corresponding to the engine rotating speed inflection point moment. In a particular embodiment, an exemplary set of predetermined torque-time-pressure maps is shown in Table 1, for example.
TABLE 1
As shown in table 1, that is, a plurality of time difference values are used as an abscissa of the table, a plurality of engine torque values are used as an ordinate of the table, and the content of elements in the table is a plurality of pressure compensation values, and then the corresponding pressure compensation values can be obtained by inputting the time difference values and the engine torque values corresponding to the inflection point time of the engine speed. For example, if the time difference is-200, and the engine torque value corresponding to the engine speed inflection point time is 100, the corresponding pressure compensation value obtained by the lookup table 1 is-0.1; for another example, if the time difference is 100, and the engine torque value corresponding to the engine speed inflection point time is 150, the corresponding pressure compensation value obtained by the lookup table 1 is 0.1, which is not described herein again.
It should be noted that, when the time difference is positive, the corresponding pressure compensation value is also a positive value; when the time difference is negative, the corresponding pressure compensation value is also negative.
In one embodiment of the invention, the method further comprises: judging whether the pressure compensation value is greater than a preset pressure compensation upper limit value or less than a preset pressure compensation lower limit value; if the pressure compensation value is larger than the pressure compensation upper limit value, performing pressure compensation control on the non-working clutch according to the pressure compensation upper limit value; if the pressure compensation value is smaller than the pressure compensation lower limit value, pressure compensation control is carried out on the non-working clutch according to the pressure compensation lower limit value, and therefore accuracy and reliability of pressure compensation control of the clutch can be improved through comparison of the preset pressure compensation limit value and the actual pressure compensation value.
In a specific embodiment, the preset upper pressure compensation limit value and the preset lower pressure compensation limit value are calibrated according to actual requirements, and specific examples are shown in table 2.
| Pressure compensation value | Upper limit value of pressure compensation | Lower limit value of pressure compensation |
| Unit/mbar | 300 | -300 |
TABLE 2
As shown in table 2, when the calculated pressure compensation value exceeds the preset pressure compensation upper limit value 300, the pressure compensation control is performed according to the pressure compensation upper limit value 300, or when the pressure compensation value is less than the preset pressure compensation lower limit value-300, the pressure compensation control is performed according to the pressure compensation lower limit value-300. Otherwise, namely the pressure compensation value is less than or equal to the pressure compensation upper limit value 300 and is greater than or equal to the pressure compensation lower limit value-300, pressure compensation control is carried out according to the pressure compensation value.
In one embodiment of the present invention, before calculating the time difference between the inflection point of the engine speed after the gear shift and the end of the preset target torque interaction phase in step S3, the method further includes: and judging whether a clutch needing pressure compensation control exists or not according to the current gear information. In other words, in the power upshift control, it is first determined whether or not the engaged clutch self-learning is possible, that is, whether or not there is a clutch that needs to be pressure compensation controlled. In a specific embodiment, whether a clutch requiring pressure compensation control exists can be judged through the current gear information. For example, as shown in table 3, wherein the upshift code number is set as: 1 represents 1 gear up and 2 gears; 2 represents 2 steps up and 3 steps up; 3 represents 3 gear up and 4 gear; 4 represents 4 steps up and 5 steps down; 5 represents 5 steps up to 6 steps; and 6 represents a 6-gear seven-gear upshift.
| Number of up-shift | 1 | 2 | 3 | 4 | 5 | 6 |
| If not, carrying out comparison on the obtained product; is-1 | 1 | 1 | 1 | 0 | 0 | 0 |
TABLE 3
In the example shown in table 3, it is explained that when the upshift numbers are 1 (i.e., 1 st upshift, 2 nd upshift, 3 rd upshift, and 3 (i.e., 3 rd upshift, 4 th upshift), the clutch requiring the pressure compensation control is present, that is, the engagement-side clutch self-learning can be performed, and when the upshift numbers are 4 (i.e., 4 th upshift, 5 th upshift, 6 th upshift, and 6 (i.e., 6 th upshift, 7 th upshift), the clutch requiring the pressure compensation control is not present, that is, the engagement-side clutch self-learning cannot be performed. The pressure compensation control of the clutch, i.e. the self-learning process of the clutch on the engaging side, can only be carried out if a clutch is present which requires pressure compensation control.
Further, in particular embodiments, the number of times each clutch is allowed to self-learn is limited, for example, each clutch is set to allow self-learn no more than a preset number of times, such as 6. That is, the number of pressure compensation controls performed on each clutch does not exceed a preset number, i.e., 6. In a specific example, for example, the clutch codes are respectively set as: 0 represents no clutch; 1 shows a clutch A; 2 shows the clutch B; 3 shows the C clutch; 4 shows the D clutch; e clutches are shown at 5, then the number of times each clutch is allowed to perform pressure compensation control in this example is shown in table 4.
TABLE 4
In one embodiment of the present invention, determining whether the vehicle is in a constant or acceleration condition according to the vehicle driving information further comprises: and if the engine torque is in a preset torque range, the engine torque change rate is in a preset torque change rate range, the engine rotating speed is in a preset rotating speed range, and the rotating speed acceleration of the output shaft of the transmission is in a preset acceleration range, judging that the vehicle is in a constant or acceleration working condition.
The preset torque range can be calibrated according to actual requirements. Table 5 exemplarily lists the upper limit value and the lower limit value of the preset torque range.
| Value of engine torque | Upper limit value of torque | Lower limit value of torque |
| Torque/unit NM | 200 | 50 |
TABLE 5
The predetermined torque rate range may be calibrated based on actual demand (e.g., gear information). Table 6 exemplarily lists the upper limit value and the lower limit value of the preset torque change rate range.
TABLE 6
The preset rotating speed range can be calibrated according to actual requirements. Table 7 exemplarily lists the upper limit value and the lower limit value of the preset rotation speed range.
| Rotational speed of engine | Upper limit value of rotation speed | Lower limit of rotation speed |
| Speed of rotation/unit rpm | 2000 | 1000 |
TABLE 7
The preset acceleration range can be calibrated according to actual requirements. Table 8 exemplarily lists the upper limit value and the lower limit value of the preset acceleration range.
| Acceleration of output shaft speedDegree of rotation | Upper limit value of acceleration | Lower limit of acceleration |
| Acceleration/unit rpm/s | 50 | 0 |
TABLE 8
In summary, according to the pressure compensation control method of the clutch provided by the embodiment of the invention, the vehicle running information is obtained, whether the vehicle is in a constant or acceleration working condition is judged according to the vehicle running information, when the vehicle is in the constant or acceleration working condition, the time difference between the inflection point moment of the engine speed after gear shifting and the end moment of the preset target torque interaction phase is calculated during power upshift control, the pressure compensation value of the clutch is obtained according to the engine torque value and the time difference corresponding to the inflection point moment of the engine speed, and the pressure compensation control is performed on the clutch according to the pressure compensation value, so that the control data of the processing error of the clutch is accurately corrected, the gear shifting quality is learned and optimized, and the requirement of a driver on the gear shifting comfort is further met.
A further embodiment of the present invention is directed to a pressure compensated control system for a clutch.
Fig. 6 is a block diagram of a pressure compensation control system for a clutch according to an embodiment of the present invention.
As shown in fig. 6, a pressure compensation control system 100 for a clutch according to an embodiment of the present invention includes: an acquisition module 110, a determination module 120, a calculation module 130, a determination module 140, and a control module 150.
The obtaining module 110 is configured to obtain vehicle driving information, where the vehicle driving information at least includes: engine torque, rate of change of engine torque, engine speed, rotational speed acceleration of the transmission output shaft.
The determining module 120 is configured to determine whether the vehicle is in a constant or acceleration condition according to the vehicle driving information.
The calculating module 130 is configured to calculate a time difference between an inflection point of the engine speed after the shift and an end of the preset target torque interaction phase when the vehicle is in a constant or acceleration condition and the power upshift control. Specifically, the time difference is the engine speed inflection point time-the target torque interaction phase end time.
The determining module 140 is configured to determine an engine torque value corresponding to an engine speed inflection point time, and obtain a pressure compensation value of the clutch according to the engine torque value corresponding to the engine speed inflection point time and a time difference.
The control module 150 is configured to perform pressure compensated clutch control based on the pressure compensated value.
That is to say, the system judges whether the vehicle is in a constant or accelerating working condition according to the vehicle running information by acquiring the vehicle running information, when the vehicle is in the constant or accelerating working condition, in the power upshift control, the time difference value between the engine rotating speed inflection point moment after the gear shifting and the preset target torque interaction phase ending moment is calculated, the pressure compensation value of the clutch is obtained according to the engine torque value and the time difference value corresponding to the engine rotating speed inflection point moment, the pressure compensation control is carried out on the clutch according to the pressure compensation value, so that the control data of the processing error of the clutch is accurately corrected, the gear shifting quality is learned and optimized, and the requirement of a driver on the gear shifting comfort is further met.
Specifically, in one embodiment of the present invention, the determination module 140 is configured to: and obtaining a pressure compensation value of the clutch by inquiring a preset torque-time-pressure relation mapping table according to the engine torque value and the time difference value corresponding to the engine rotating speed inflection point moment, wherein the torque-time-pressure relation mapping table comprises a plurality of groups of mutual corresponding relations of torque, time and pressure, and the mutual corresponding relations of the plurality of groups of torque, time and pressure at least comprise the corresponding relations among the engine torque value, the time difference and the pressure compensation value corresponding to the engine rotating speed inflection point moment. It should be noted that, when the time difference is positive, the corresponding pressure compensation value is also a positive value; when the time difference is negative, the corresponding pressure compensation value is also negative.
In one embodiment of the present invention, the control module 150 is further configured to: judging whether the pressure compensation value is greater than a preset pressure compensation upper limit value or less than a preset pressure compensation lower limit value; when the pressure compensation value is larger than the pressure compensation upper limit value, performing pressure compensation control on the non-working clutch according to the pressure compensation upper limit value; when the pressure compensation value is smaller than the pressure compensation lower limit value, the pressure compensation control is carried out on the non-working clutch according to the pressure compensation lower limit value, so that the accuracy and the reliability of the pressure compensation control of the clutch can be improved through the comparison of the preset pressure compensation limit value and the actual pressure compensation value.
In an embodiment of the present invention, before the calculating module 130 calculates the time difference between the inflection point of the engine speed after the gear shift and the end of the preset target torque interaction phase, the determining module 120 is further configured to: and judging whether a clutch needing pressure compensation control exists or not according to the current gear information. In other words, in the power upshift control, it is first determined whether or not the engaged clutch self-learning is possible, that is, whether or not there is a clutch that needs to be pressure compensation controlled. In a specific embodiment, whether a clutch requiring pressure compensation control exists can be judged through the current gear information.
In one embodiment of the present invention, the determining module 120 determines whether the vehicle is in a constant or acceleration condition according to the vehicle driving information, including: and if the engine torque is in a preset torque range, the engine torque change rate is in a preset torque change rate range, the engine rotating speed is in a preset rotating speed range, and the rotating speed acceleration of the output shaft of the transmission is in a preset acceleration range, judging that the vehicle is in a constant or acceleration working condition.
It should be noted that a specific implementation manner of the pressure compensation control system of the clutch according to the embodiment of the present invention is similar to a specific implementation manner of the pressure compensation control method of the clutch according to the embodiment of the present invention, and please refer to the description of the method part specifically, and details are not repeated here in order to reduce redundancy.
According to the pressure compensation control system of the clutch, the vehicle running information is obtained, whether the vehicle is in a constant or accelerating working condition is judged according to the vehicle running information, when the vehicle is in the constant or accelerating working condition and power upshifting control is carried out, the time difference value between the engine rotating speed inflection point moment after gear shifting and the preset target torque interaction stage ending moment is calculated, the pressure compensation value of the clutch is obtained according to the engine torque value and the time difference value corresponding to the engine rotating speed inflection point moment, pressure compensation control is carried out on the clutch according to the pressure compensation value, therefore, control data of processing errors of the clutch are accurately corrected, gear shifting quality is learned and optimized, and the requirement of a driver on gear shifting comfort is further met.
Further, an embodiment of the invention discloses a vehicle provided with a pressure compensation control system of the clutch as described in any one of the above embodiments. This vehicle can carry out pressure compensation to the clutch to carry out accurate correction to clutch machining error's control data, study the optimization to the quality of shifting, and then satisfy the driver to the demand of the travelling comfort that shifts.
In addition, other configurations and functions of the vehicle according to the embodiment of the present invention are known to those skilled in the art, and are not described herein in detail in order to reduce redundancy.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A pressure compensation control method of a clutch, comprising the steps of:
acquiring vehicle running information, wherein the vehicle running information at least comprises: engine torque, rate of change of engine torque, engine speed, speed acceleration of the transmission output shaft;
judging whether the vehicle is in a constant or acceleration working condition or not according to the vehicle running information;
if so, calculating the time difference between the inflection point moment of the engine speed after gear shifting and the end moment of the preset target torque interaction stage during power upshift control;
determining an engine torque value corresponding to the engine speed inflection point moment, and obtaining a pressure compensation value of the clutch according to the engine torque value corresponding to the engine speed inflection point moment and the time difference value;
and performing pressure compensation control on the clutch according to the pressure compensation value.
2. The pressure compensation control method of a clutch according to claim 1, wherein the pressure compensation value of the clutch is obtained from the engine torque value corresponding to the inflection point of the engine speed and the time difference value, and further comprising:
and obtaining a pressure compensation value of the clutch by inquiring a preset torque-time-pressure relation mapping table according to the engine torque value and the time difference value corresponding to the engine rotating speed inflection point moment, wherein the torque-time-pressure relation mapping table comprises a plurality of groups of mutual corresponding relations of torque, time and pressure, and the mutual corresponding relations of the plurality of groups of torque, time and pressure at least comprise corresponding relations among the engine torque value, the time difference and the pressure compensation value corresponding to the engine rotating speed inflection point moment.
3. The pressure compensation control method of a clutch according to claim 1 or 2, characterized by further comprising:
judging whether the pressure compensation value is larger than a preset pressure compensation upper limit value or smaller than a preset pressure compensation lower limit value;
if the pressure compensation value is larger than the pressure compensation upper limit value, performing pressure compensation control on the non-working clutch according to the pressure compensation upper limit value;
and if the pressure compensation value is smaller than the lower pressure compensation limit value, performing pressure compensation control on the non-working clutch according to the lower pressure compensation limit value.
4. The pressure compensation control method of a clutch according to claim 1, wherein before calculating a time difference between a moment of inflection point of engine speed after shifting and a moment of ending a preset target torque interaction phase, further comprising:
and judging whether a clutch needing pressure compensation control exists or not according to the current gear information.
5. The pressure compensation control method of a clutch according to claim 1, wherein determining whether a vehicle is in a constant or acceleration condition according to the vehicle travel information, further comprises:
and if the engine torque is in a preset torque range, the engine torque change rate is in a preset torque change rate range, the engine rotating speed is in a preset rotating speed range, and the rotating speed acceleration of the output shaft of the transmission is in a preset acceleration range, judging that the vehicle is in a constant or acceleration working condition.
6. A pressure compensating control system for a clutch, comprising:
an obtaining module, configured to obtain vehicle driving information, where the vehicle driving information at least includes: engine torque, rate of change of engine torque, engine speed, speed acceleration of the transmission output shaft;
the judging module is used for judging whether the vehicle is in a constant or acceleration working condition or not according to the vehicle running information;
the calculation module is used for calculating the time difference between the inflection point moment of the engine speed after gear shifting and the end moment of the preset target torque interaction stage when the vehicle is in a constant or acceleration working condition and the power is subjected to gear shifting control;
the determining module is used for determining an engine torque value corresponding to the engine speed inflection point moment and obtaining a pressure compensation value of the clutch according to the engine torque value corresponding to the engine speed inflection point moment and the time difference value;
and the control module is used for carrying out pressure compensation control on the clutch according to the pressure compensation value.
7. The pressure compensation control system of a clutch of claim 6, wherein the determination module is configured to:
and obtaining a pressure compensation value of the clutch by inquiring a preset torque-time-pressure relation mapping table according to the engine torque value and the time difference value corresponding to the engine rotating speed inflection point moment, wherein the torque-time-pressure relation mapping table comprises a plurality of groups of mutual corresponding relations of torque, time and pressure, and the mutual corresponding relations of the plurality of groups of torque, time and pressure at least comprise corresponding relations among the engine torque value, the time difference and the pressure compensation value corresponding to the engine rotating speed inflection point moment.
8. The pressure compensating control system of a clutch of claim 6 or 7, wherein the control module is further configured to:
judging whether the pressure compensation value is larger than a preset pressure compensation upper limit value or smaller than a preset pressure compensation lower limit value;
when the pressure compensation value is larger than the pressure compensation upper limit value, carrying out pressure compensation control on the non-working clutch according to the pressure compensation upper limit value;
and when the pressure compensation value is smaller than the lower pressure compensation limit value, performing pressure compensation control on the non-working clutch according to the lower pressure compensation limit value.
9. The pressure compensation control system of a clutch of claim 6, wherein the determination module is further configured to:
and judging whether a clutch needing pressure compensation control exists or not according to the current gear information.
10. A vehicle, characterized in that a pressure compensation control system of a clutch according to any one of claims 6-9 is provided.
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| CN113944560B (en) * | 2020-07-17 | 2024-01-19 | 上海汽车集团股份有限公司 | Self-adaptive control method and device for clutch |
| CN112161050B (en) * | 2020-10-31 | 2021-12-31 | 重庆青山工业有限责任公司 | Clutch pressure compensation control method of wet DCT |
| CN112303226B (en) * | 2020-11-27 | 2022-04-19 | 重庆青山工业有限责任公司 | Pressure and torque curve correction method for wet-type double clutches |
| CN113790225B (en) * | 2021-07-07 | 2023-04-07 | 重庆青山工业有限责任公司 | Pressure control method for clutch of hybrid power transmission |
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| CN114382797B (en) * | 2022-01-14 | 2023-07-25 | 湘潭大学 | Clutch reliability compensation control system and method under different working conditions |
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| CN114922972B (en) * | 2022-05-18 | 2024-03-26 | 中国第一汽车股份有限公司 | Self-adaptive control method for upshift of double-clutch automatic transmission and automatic transmission |
| CN115095653A (en) * | 2022-06-15 | 2022-09-23 | 中国第一汽车股份有限公司 | Downshift control method and device for double clutches, electronic equipment and medium |
| CN115217962B (en) * | 2022-07-15 | 2023-11-14 | 奇瑞商用车（安徽）有限公司 | Engine torque compensation control method and system in gear shifting torque interaction stage |
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