CN110131400B - Transmission oil pressure control method and system and automobile - Google Patents
Transmission oil pressure control method and system and automobile Download PDFInfo
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- CN110131400B CN110131400B CN201810126833.0A CN201810126833A CN110131400B CN 110131400 B CN110131400 B CN 110131400B CN 201810126833 A CN201810126833 A CN 201810126833A CN 110131400 B CN110131400 B CN 110131400B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/0021—Generation or control of line pressure
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Abstract
Provided are a transmission oil pressure control method and system, and a vehicle, wherein the transmission oil pressure control method includes: dividing the steady-state working condition into a plurality of steady-state modes; obtaining a torque oil pressure curve for each steady state mode, comprising performing the following steps in each steady state mode: dividing a single steady-state mode into a plurality of torque intervals according to the torque, and judging whether a data point obtaining condition is met; increasing oil pressure to lock the hydraulic torque converter; gradually reducing the oil pressure until corresponding torque and oil pressure are recorded when the clutch slip is greater than a threshold value N1 to obtain data points; fitting the data points acquired in each torque interval into a torque oil pressure curve; and controlling the oil pressure in each steady mode according to the torque oil pressure curve in each steady mode. According to the transmission oil pressure control method and system and the automobile, the oil pressure control strategy can be made according to actual conditions, the control strategy can be updated, the oil pressure setting optimization is ensured, and the hydraulic loss is reduced.
Description
Technical Field
The invention relates to the field of oil pressure control of automobile transmissions, in particular to a transmission oil pressure control method and system and an automobile.
Background
The main oil pressure control system of the gearbox is a main component of the hydraulic automatic transmission, and enough main oil pressure can ensure the normal work of a hydraulic element, ensure that a hydraulic torque converter and a clutch can efficiently transmit torque, and ensure that the transmission has enough lubricating and cooling capacities. The main oil pressure of the gearbox is provided by a gearbox oil pump and is adjusted by a main oil pressure adjusting valve. The main oil pressure of the gearbox under the steady-state working condition is mainly determined by the gearbox torque needing to be transmitted by the clutch under each gear, and the main oil pressure also needs to be calculated in real time because the gearbox torque is changed in real time in the driving process.
In general, when designing an oil pressure strategy, a main oil pressure value is always set according to the requirement of a friction torque reserve coefficient, and the main oil pressure value is set at the time of automobile leaving a factory and is not changed.
Disclosure of Invention
It is an object of the present invention to solve or at least alleviate problems in the prior art.
According to some aspects, there is provided a transmission oil pressure control method, the method comprising:
dividing the steady-state working condition into a plurality of steady-state modes;
obtaining a torque oil pressure curve for each steady state mode, comprising performing the following steps in each steady state mode:
the single steady state mode is divided into a plurality of torque intervals according to the torque,
judging whether a data point acquisition condition is met;
increasing oil pressure to lock the hydraulic torque converter;
gradually reducing the oil pressure until corresponding torque and oil pressure are recorded when the clutch slip is greater than a threshold value N1 to obtain data points; and
fitting the data points acquired in each torque interval into a torque oil pressure curve;
and controlling the oil pressure in each steady mode according to the torque oil pressure curve in each steady mode.
Optionally, in the above method, the method further comprises: an initial torque oil pressure curve in each steady-state mode is preset empirically.
Optionally, in the above method, the method further comprises: the torque oil pressure curve in each steady-state mode is updated at intervals.
Optionally, in the above method, the method comprises: dividing a single steady-state mode into a high torque interval and a low torque interval;
determining a first data point and a second data point for a single steady-state mode, comprising:
gradually reducing oil pressure within the low torque interval of the single steady state mode until corresponding torque and oil pressure are recorded at a clutch slip greater than a threshold value N1 to obtain a first data point;
gradually reducing oil pressure within the high torque interval of the single steady state mode until corresponding torque and oil pressure are recorded at a clutch slip greater than a threshold value N1 to obtain a first data point; and
and fitting the first data point and the second data point of the single steady-state mode into a straight line to obtain the oil pressure gain and the oil pressure compensation under the single steady-state mode.
Optionally, in the method, the step of determining whether the condition for acquiring the data point is satisfied includes:
judging whether the current stability is kept to exceed a time threshold value;
judging whether the torque is in the plurality of torque intervals; and
and judging whether the rotating speed of the input shaft of the gearbox is in a rotating speed interval corresponding to the torque interval.
Optionally, in the above method, the method includes fitting the data points acquired in each torque interval to a straight line in a coordinate system with the torque as a horizontal axis and the oil pressure as a vertical axis.
Alternatively, in the above method, the step of increasing the oil pressure to lock up the torque converter includes increasing the oil pressure until the clutch slip is less than the threshold value N2.
Optionally, in the method above, the method further comprises dividing the steady state operating conditions into 2T steady state modes based on the number of gears T and the torque converter state on or off.
In another aspect, a transmission oil pressure control system is provided that controls transmission oil pressure according to the method described in various embodiments.
In another aspect, an automobile is provided that includes the transmission oil pressure control system according to each embodiment.
The oil pressure control method and the oil pressure control system of the transmission and the automobile can make an oil pressure control strategy according to actual conditions, can update the control strategy, ensure the optimization of oil pressure setting, reduce hydraulic loss and improve the transmission efficiency and the fuel economy.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Moreover, in the drawings, like numerals are used to indicate like parts, and in which:
fig. 1 shows a configuration diagram of a main oil pressure control system of a hydraulic automatic transmission;
FIG. 2 shows a schematic diagram of a clutch construction; and
fig. 3 to 5 show step diagrams of the method according to the invention.
Detailed Description
It is easily understood that according to the technical solution of the present invention, a person skilled in the art can propose various alternative structures and implementation ways without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical aspects of the present invention, and should not be construed as all of the present invention or as limitations or limitations on the technical aspects of the present invention.
The terms of orientation of up, down, left, right, front, back, top, bottom, and the like referred to or may be referred to in this specification are defined relative to the configuration shown in the drawings, and are relative terms, and thus may be changed correspondingly according to the position and the use state of the device. Therefore, these and other directional terms should not be construed as limiting terms.
Fig. 1 shows a configuration diagram of a main oil pressure control system of a hydraulic automatic transmission, which includes a main oil pump 1, a main oil pressure regulating valve 2, a clutch oil pressure regulating valve 3, a clutch 4, and a compensation oil pressure regulating valve 5, which are connected in this order.
Fig. 2 shows a schematic diagram of the clutch structure. The resultant force P of the oil pressure P1 and the resisting force P2 of the spring 7 acts on the clutch disk 6. The magnitude of the oil pressure P1 is controlled according to the method of the present invention, as described below.
As shown in fig. 3, a transmission oil pressure (P1) control method according to some embodiments of the invention includes:
s0 dividing the steady-state operating condition into a plurality of steady-state modes;
s1 obtaining a torque oil pressure curve for each steady state mode includes performing the following steps in each steady state mode:
s11 divides the single steady state mode into a plurality of torque intervals according to torque,
s12, judging whether the data point acquisition condition is met;
s13 increasing the oil pressure to lock the torque converter;
s14 obtaining data points about torque and oil pressure in the current torque interval; and
s15, fitting the data points acquired in each torque interval into a torque oil pressure curve;
s2 controls the oil pressure in each steady-state mode according to the torque oil pressure curve in each steady-state mode.
In some embodiments, step S0 includes dividing the steady-state operating conditions into 2T steady-state modes based on the number of gears T and the torque converter state on or off. For example, the torque converter on and off states for 6 gears, respectively, total 12 stable modes are divided.
In some embodiments, before the above-described control method is performed, an initial torque oil pressure curve in each steady-state mode is first empirically preset, and the oil pressure is controlled in accordance with the preset initial torque oil pressure curve.
In some embodiments, the method includes the step S3 of updating the torque oil pressure curve in each of the steady-state modes in the same manner at certain intervals and controlling the oil pressure in each of the steady-state modes according to the updated torque oil pressure curve in each of the steady-state modes.
The control method of the present invention determines an optimal oil pressure based on actual transmission conditions, thereby determining an oil pressure control strategy, and provides a self-learning control strategy that updates the oil pressure control strategy by constantly updating the pressure curve to vary with transmission conditions. As the parameters of the clutch are gradually changed along with the use and the abrasion of the vehicle, the initial set main oil pressure of the hydraulic automatic transmission is higher, the hydraulic loss is increased, the transmission efficiency is reduced, and the fuel economy is greatly influenced. And continuously updating the control strategy can avoid the disadvantages.
In some embodiments, step S1 includes stepping down the oil pressure until a corresponding torque and oil pressure are recorded when the clutch slip is greater than the threshold N1 to obtain the data point. Clutch slip is expressed as the difference between the speed of the transmission input shaft and the speed of the engine. The threshold value N1 should be small enough to ensure proper operation of the clutch, and the corresponding oil pressure can be regarded as the minimum suitable oil pressure for ensuring proper operation of the clutch under the condition.
In some embodiments, the method includes fitting the data points acquired in each torque interval to a straight line in a coordinate system having torque as the horizontal axis and oil pressure as the vertical axis.
In some embodiments, the step S11 of dividing the single steady state mode into a plurality of torque intervals according to torque includes dividing the single steady state mode into two torque intervals according to torque, referred to as: a high torque interval and a low torque interval, and data points are obtained from the high torque interval and the low torque interval, respectively, including a first data point and a second data point. The high torque interval and the low torque interval are preferably sufficiently spaced apart, for example the lower limit of the high torque interval differs from the upper limit of the low torque interval by at least 200Nm, such that the first data point and the second data point are sufficiently spaced apart. Wherein acquiring the first data point comprises: gradually reducing oil pressure within the low torque interval of the single steady state mode until corresponding torque and oil pressure are recorded when clutch slip is greater than a threshold value to obtain a first data point. Acquiring the second data point includes: gradually reducing oil pressure within the high torque interval of the single steady state mode until corresponding torque and oil pressure are recorded when clutch slip is greater than a threshold value to obtain a first data point. And then fitting the first data point and the second data point of the single steady-state mode into a straight line to obtain the oil pressure gain and the oil pressure compensation under the single steady-state mode, wherein the oil pressure gain is the slope of the straight line, and the compensation is the oil pressure when the torque is zero. In an alternative embodiment, more data points may be selected so that the fitted curve is more accurate.
In some embodiments, as shown in fig. 5, the step S12 of determining whether the condition for acquiring the data point is satisfied includes:
s111, judging whether the current steady state exceeds a time threshold value, if so, continuing the following judgment, and if not, ending the judgment. This step is intended to judge whether the vehicle driving state is in a steady state.
S112, judging whether the torque is in the multiple torque intervals, if so, continuing the following judgment, and if not, ending the judgment; this step may include determining whether the torque is in a first torque interval, determining whether the torque is in a second torque interval, etc.
S113, judging whether the rotating speed of the input shaft of the gearbox is in a rotating speed interval corresponding to the torque interval or not, if so, entering a step S114, and starting to acquire data points, otherwise, ending. This determination further confirms that the vehicle is in a steady state by the rotation speed determination.
In alternative embodiments, any other necessary decision condition may be added.
In some embodiments, the step of increasing oil pressure to lock up the torque converter at S13 includes increasing oil pressure until transmission slip is less than threshold N2.
In addition, the invention also provides a transmission oil pressure control system and an automobile, which control the transmission oil pressure according to the method.
Advantages of various embodiments of the present invention include, but are not limited to:
the method has the advantages of simple steps and accurate control, successfully realizes the main oil pressure self-learning function of the hydraulic automatic transmission, and can learn for multiple times according to the service life of the transmission so as to adapt to the characteristics of clutches under different wear conditions. The method of the invention can ensure that the clutch can effectively transmit torque, can also ensure that the pressure of the main oil pressure is the lowest, reduces hydraulic loss and improves the transmission efficiency of the hydraulic automatic transmission.
The foregoing description of the specific embodiments has been presented only to illustrate the principles of the invention more clearly, and in which various features are shown or described in detail to facilitate an understanding of the principles of the invention. Various modifications or changes to the invention will be readily apparent to those skilled in the art without departing from the scope of the invention. It is to be understood that such modifications and variations are intended to be included within the scope of the present invention.
Claims (9)
1. A transmission oil pressure control method, the method comprising:
dividing the steady-state working conditions into 2T steady-state modes according to the gear number T and the combination or separation state of the hydraulic torque converter;
obtaining a torque oil pressure curve for each steady state mode, comprising performing the following steps in each steady state mode:
a single steady-state mode is divided into two torque intervals based on torque,
judging whether the data point acquisition condition is met or not, comprising the following steps: judging whether the current steady state is kept over a time threshold value;
increasing oil pressure to lock the hydraulic torque converter;
gradually reducing the oil pressure until corresponding torque and oil pressure are recorded when the clutch slip is greater than a threshold value N1 to obtain data points; and
fitting the data points acquired in each torque interval into a torque oil pressure curve;
and controlling the oil pressure in each steady mode according to the torque oil pressure curve in each steady mode.
2. The oil pressure control method according to claim 1, characterized by further comprising: an initial torque oil pressure curve in each steady-state mode is preset empirically.
3. The oil pressure control method according to claim 2, characterized by further comprising: the torque oil pressure curve in each steady-state mode is updated at intervals.
4. The oil pressure control method according to claim 1, characterized by comprising: dividing a single steady-state mode into a high torque interval and a low torque interval;
determining a first data point and a second data point for a single steady-state mode, comprising:
gradually reducing oil pressure within the low torque interval of the single steady state mode until corresponding torque and oil pressure are recorded at a clutch slip greater than a threshold value N1 to obtain a first data point;
gradually reducing oil pressure within the high torque interval of the single steady state mode until corresponding torque and oil pressure are recorded when clutch slip is greater than a threshold value N1 to obtain a second data point; and
and fitting the first data point and the second data point of the single steady-state mode into a straight line to obtain the oil pressure gain and the oil pressure compensation under the single steady-state mode.
5. The oil pressure control method according to any one of claims 1 to 4, characterized in that the step of determining whether the condition for acquiring the data point is satisfied further comprises:
judging whether the torque is in the two torque intervals; and
and judging whether the rotating speed of the input shaft of the transmission is in a rotating speed range corresponding to the torque range.
6. An oil pressure control method according to any one of claims 1 to 3, characterized in that the method includes fitting the data points acquired in each torque interval to a straight line in a coordinate system having the torque as a horizontal axis and the oil pressure as a vertical axis.
7. The oil pressure control method according to any one of claims 1 to 4, wherein the step of increasing the oil pressure to lock up the torque converter includes increasing the oil pressure until the clutch slip is less than a threshold value N2.
8. A transmission oil pressure control system, characterized in that it controls transmission oil pressure according to the method of any one of claims 1-7.
9. A vehicle comprising the transmission oil pressure control system according to claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810126833.0A CN110131400B (en) | 2018-02-08 | 2018-02-08 | Transmission oil pressure control method and system and automobile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810126833.0A CN110131400B (en) | 2018-02-08 | 2018-02-08 | Transmission oil pressure control method and system and automobile |
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| CN110131400A CN110131400A (en) | 2019-08-16 |
| CN110131400B true CN110131400B (en) | 2021-01-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810126833.0A Active CN110131400B (en) | 2018-02-08 | 2018-02-08 | Transmission oil pressure control method and system and automobile |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111043298A (en) * | 2019-12-29 | 2020-04-21 | 盛瑞传动股份有限公司 | Control method for preventing clutch from slipping during action of hydraulic torque converter of automatic transmission |
| CN113586621B (en) * | 2021-06-10 | 2022-11-01 | 东风汽车集团股份有限公司 | Vehicle, gearbox and clutch torque control method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010052337A1 (en) * | 2010-11-25 | 2012-05-31 | Voith Patent Gmbh | Method for adjusting the working pressure of a gearbox |
| CN104662340A (en) * | 2012-09-26 | 2015-05-27 | 加特可株式会社 | Automatic transmission equipped with friction element having locking mechanism attached thereto, and control method therefor |
| CN106662244A (en) * | 2014-07-09 | 2017-05-10 | 加特可株式会社 | Lock-up-clutch control device |
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2018
- 2018-02-08 CN CN201810126833.0A patent/CN110131400B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010052337A1 (en) * | 2010-11-25 | 2012-05-31 | Voith Patent Gmbh | Method for adjusting the working pressure of a gearbox |
| CN104662340A (en) * | 2012-09-26 | 2015-05-27 | 加特可株式会社 | Automatic transmission equipped with friction element having locking mechanism attached thereto, and control method therefor |
| CN106662244A (en) * | 2014-07-09 | 2017-05-10 | 加特可株式会社 | Lock-up-clutch control device |
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| CN110131400A (en) | 2019-08-16 |
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