CN114658841B - Power upshift rotating speed adjusting method and vehicle - Google Patents
Power upshift rotating speed adjusting method and vehicle Download PDFInfo
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- CN114658841B CN114658841B CN202210417437.XA CN202210417437A CN114658841B CN 114658841 B CN114658841 B CN 114658841B CN 202210417437 A CN202210417437 A CN 202210417437A CN 114658841 B CN114658841 B CN 114658841B
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 230000009467 reduction Effects 0.000 claims abstract description 45
- 230000005540 biological transmission Effects 0.000 claims abstract description 18
- 230000003213 activating effect Effects 0.000 claims abstract description 6
- 230000001105 regulatory effect Effects 0.000 claims abstract description 4
- 230000006870 function Effects 0.000 claims description 27
- 230000001133 acceleration Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 abstract description 8
- 230000001276 controlling effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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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
- F16H61/04—Smoothing ratio shift
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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
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
Abstract
The invention discloses a power upshift rotating speed adjusting method and a vehicle, and belongs to the technical field of double-clutch automatic transmissions. Judging whether the gear shifting stage is in a rotating speed adjusting stage or not; if the gear shifting stage is in the rotating speed adjusting stage, closing the clutch closed-loop control sliding function, and activating the engine speed-reducing turn-off loop adjusting function; when the engine speed-reducing turn-off ring regulating function is activated, an engine speed-reducing basic value is obtained according to a speed difference value between the estimated engine speed and the target engine speed, the engine torque without intervention and the target gear table; according to the engine torque without intervention and the target gear, searching an engine torque reduction adjustment coefficient table to obtain an engine torque reduction adjustment coefficient; the engine torque reduction is requested, and the torque reduction value is the product of the engine torque reduction basic value and the engine torque reduction adjustment coefficient. The engine rotating speed synchronization in the rotating speed adjusting process is realized, the stability of the torque transmission of the clutch is ensured, and the smoothness of the whole vehicle in the rotating speed adjusting process is improved.
Description
Technical Field
The invention relates to the technical field of double-clutch automatic transmissions, in particular to a power upshift rotating speed adjusting method and a vehicle.
Background
The double clutch automatic transmission comprises two sets of gear transmission systems, wherein an odd clutch controls the power transmission of odd gears, such as 1 gear, 3 gear, 5 gear and 7 gear; the even clutch controls the power transmission of even gears, such as 2, 4, 6, and R. After the proper gear is selected by a control program in the transmission control unit and gear engagement is completed, the combination and separation of the odd clutch and the even clutch are respectively controlled to realize gear switching. The gear shifting time sequence of the power upshift is as follows: idle, clutch oil charge, torque exchange, speed adjustment, idle.
The engine speed is calculated according to a low gear to carry out sliding control, and the engine speed is calculated according to a high gear to carry out sliding control after the speed is adjusted.
The conventional power upshift rotational speed adjustment method is to request engine torque reduction according to a target gear, a vehicle speed, or an engine torque, and simultaneously adjust the engine rotational speed in a closed loop by controlling clutch pressure, but the method may cause the clutch pressure to increase or decrease during the rotational speed adjustment, thereby causing a shift irregularity.
For this reason, it is desirable to provide a power upshift rotational speed adjustment method and a vehicle to solve the above-described problems.
Disclosure of Invention
The invention aims to provide a power upshift rotating speed adjusting method and a vehicle, which replace a mode of adjusting the rotating speed of an engine by adjusting the pressure of a clutch, can ensure the stability of torque transmission of the clutch and improve the smoothness of the whole vehicle in the rotating speed adjusting process.
In order to achieve the above object, the following technical scheme is provided:
A power upshift rotating speed adjusting method comprises the following steps:
acquiring and confirming that the gear shifting type judged by the gear shifting coordination module is a power upshift;
judging whether the gear shifting stage is in a rotating speed adjusting stage or not;
If the gear shifting stage is in the rotating speed adjusting stage, closing the clutch closed-loop control sliding function, and activating the engine speed-reducing turn-off loop adjusting function; when the engine speed-reducing turn-off ring regulating function is activated, an engine speed-reducing basic value is obtained according to a speed difference value between the estimated engine speed and the target engine speed, the engine torque without intervention and the target gear table; according to the engine torque without intervention and the target gear, searching an engine torque reduction adjustment coefficient table to obtain an engine torque reduction adjustment coefficient; the engine torque reduction is requested, and the torque reduction value is the product of the engine torque reduction basic value and the engine torque reduction adjustment coefficient.
As an alternative to the power upshift rotational speed adjustment method,
Judging whether the difference value between the estimated engine speed and the high-gear clutch speed is smaller than the speed limit value;
when the estimated engine speed and the high gear clutch speed are smaller than the speed limit value, the engine speed-reducing turn-off loop adjusting function is closed, the clutch closed-loop control sliding function is opened, and the speed adjusting stage is exited.
As an alternative to the power upshift rotational speed adjustment method, when exiting the rotational speed adjustment phase, activating the rotational speed adjustment phase total duration learning function;
When the total duration learning function of the rotating speed adjusting stage is activated, calculating the total duration of the rotating speed adjusting stage, increasing the torque reducing adjustment coefficient in the engine torque reducing adjustment coefficient table according to a first preset adjustment step length when the total duration of the rotating speed adjusting stage is larger than the preset upper limit of the rotating speed adjusting stage, reducing the torque reducing adjustment coefficient in the engine torque reducing adjustment coefficient table according to a second preset adjustment step length when the total duration of the rotating speed adjusting stage is smaller than the preset lower limit of the rotating speed adjusting stage, and not adjusting the torque reducing adjustment coefficient in the engine torque reducing adjustment coefficient table when the total duration of the rotating speed adjusting stage is between the preset upper limit of the rotating speed adjusting stage and the preset lower limit of the rotating speed adjusting stage.
As an alternative scheme of the power upshift rotating speed adjusting method, when the whole vehicle is powered down, the engine torque reducing adjusting coefficient is stored in a nonvolatile memory.
As an alternative to the power upshift rotational speed adjustment method, the engine rotational speed acceleration is calculated from the engine rotational speed, wherein the engine rotational speed is acquired by a rotational speed sensor.
As an alternative to the power upshift rotational speed adjustment method, the estimated engine rotational speed is obtained from the current engine rotational speed, the engine rotational speed acceleration, and the preset duration.
As an alternative to the power upshift rotational speed adjustment method, the preset time period is set to 25ms-85ms.
As an alternative to the power upshift rotational speed adjustment method, the engine target rotational speed is calculated by the engine target rotational speed calculation module according to a preset smoothing curve based on the high clutch rotational speed, the low clutch rotational speed, and the target slip, the target slip being set to 0-105rpm.
As an alternative to the power upshift rotational speed adjustment method, the rotational speed limit value is set to 15rpm-105rpm.
A vehicle comprises a double clutch automatic transmission and the technical scheme of the power upshift rotational speed adjustment method, wherein the double clutch automatic transmission is controlled by adopting the power upshift rotational speed adjustment method.
Compared with the prior art, the invention has the beneficial effects that:
According to the power upshift rotating speed adjusting method provided by the invention, when a gear shifting stage is in a rotating speed adjusting stage, a clutch closed-loop control sliding grinding function is closed, and an engine torque reducing basic value is obtained according to a rotating speed difference value between a predicted engine rotating speed and an engine target rotating speed, an engine torque without intervention and a target gear table lookup; according to the engine torque without intervention and the target gear, searching an engine torque reduction adjustment coefficient table to obtain an engine torque reduction adjustment coefficient; the torque reduction of the engine is requested, the torque reduction value is the product of the torque reduction basic value of the engine and the torque reduction adjustment coefficient of the engine, namely, the torque reduction of the engine is dynamically adjusted according to the estimated rotational speed difference value of the engine rotational speed and the target rotational speed of the engine, so that the engine rotational speed synchronization in the rotational speed adjustment process is realized.
According to the vehicle provided by the invention, the double clutch automatic transmission is controlled by adopting the rotating speed adjusting method, so that the stability of torque transmission of the clutch is ensured, and the smoothness of the whole vehicle in the rotating speed adjusting process is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the drawings needed in the description of the embodiments of the present invention, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the contents of the embodiments of the present invention and these drawings without inventive effort for those skilled in the art.
FIG. 1 is a flowchart of a method for adjusting a power upshift rotational speed according to an embodiment of the present invention;
FIG. 2 is a flowchart of another method for adjusting rotational speed according to an embodiment of the present invention;
fig. 3 is a flowchart of a transfer adjustment stage total duration learning function according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; either mechanically or electrically. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
The conventional power upshift rotational speed adjustment method is to request engine torque reduction according to a target gear, a vehicle speed, or an engine torque, and simultaneously adjust the engine rotational speed in a closed loop by controlling clutch pressure, but the method may cause the clutch pressure to increase or decrease during the rotational speed adjustment, thereby causing a shift irregularity.
In order to replace a mode of adjusting the rotation speed of an engine by adjusting the pressure of a clutch, to ensure the stability of torque transmission of the clutch and improve the smoothness of the whole vehicle in the rotation speed adjusting process, the embodiment provides a power upshift rotation speed adjusting method. The controller can be connected with an accelerator pedal position sensor to acquire the position of the accelerator pedal and further acquire the accelerator opening. The details of the present embodiment are described in detail below with reference to fig. 1 to 3.
As shown in fig. 1, the present embodiment provides a power upshift rotational speed adjustment method including the steps of:
step 1, acquiring and confirming that the gear shifting type judged by a gear shifting coordination module is a power upshift;
step 2, judging whether a gear shifting stage is in a rotating speed adjusting stage or not;
Step 3, if the gear shifting stage is in the rotating speed adjusting stage, closing the clutch closed-loop control sliding function, and activating the engine speed-reducing turn-off loop adjusting function; when the engine drop turn-off ring adjusting function is activated, the steps 31, 32 and 33 are executed.
Step 31, obtaining an engine torque reduction basic value according to a rotational speed difference value between the estimated engine rotational speed and the target engine rotational speed, the non-interference engine torque and the target gear table; the engine target rotating speed is calculated and obtained by an engine target rotating speed calculating module according to a preset smooth curve according to the rotating speed of the high-gear clutch, the rotating speed of the low-gear clutch and the target slip difference; the high gear clutch rotating speed and the low gear clutch rotating speed are obtained through a rotating speed sensor; the target slip is obtained by calibration and is set to 0rpm-105rpm. Preferably, the target slip setting is generally set to 0rpm-100rpm. The engine torque without intervention is calculated and obtained by an engine torque calculation module.
Step 32, searching an engine torque reduction adjustment coefficient table according to the engine torque without intervention and the target gear to obtain an engine torque reduction adjustment coefficient; the engine torque reduction adjustment coefficient table is obtained through self-learning of gear shifting time and stored in a nonvolatile memory of the controller.
And step 33, requesting the engine to reduce the torque, wherein the torque reduction value is the product of the engine torque reduction basic value and the engine torque reduction adjustment coefficient.
Specifically, before step 31 is performed, engine rotational speed acceleration is calculated from the engine rotational speed, which is acquired by a rotational speed sensor. And estimating the engine speed after the preset time according to the current engine speed and the engine speed acceleration, namely estimating the engine speed. The preset time length is obtained through calibration and combined with the engine torque reduction response time, and the preset time length is set to be 25ms-85ms. Preferably, the preset time period is generally set to 30ms-80ms.
Further, as shown in fig. 2, step 4, judging whether the difference between the estimated engine speed and the high clutch speed is smaller than the speed limit; wherein the rotation speed limit value is obtained through calibration, and the rotation speed limit value is set to 15rpm-105rpm. Preferably, the rotational speed limit is set at 20rpm-100rpm.
And 5, when the estimated engine speed and the high-gear clutch speed are smaller than the speed limit value, closing the engine speed-reducing turn-off loop regulating function.
And step 6, opening a clutch closed-loop control sliding function.
And step 7, exiting the rotation speed adjustment stage. And exiting the rotation speed adjusting stage, namely ending the rotation speed adjusting stage.
Step 8, when the rotational speed adjustment stage is exited, activating a total duration learning function of the rotational speed adjustment stage; the total duration learning function in the rotational speed adjustment stage in this embodiment is also called shift time self-learning.
When the function of learning the total duration of the rotational speed adjustment stage is activated, as shown in fig. 3, step 81 is executed to calculate the total duration of the rotational speed adjustment stage. The total time length of the rotating speed adjusting stage is the time length from the beginning of the rotating speed adjusting stage to the ending of the rotating speed adjusting stage, which is acquired by the timer module.
As shown in fig. 3, step 82 is executed to increase the torque reduction adjustment coefficient in the engine torque reduction adjustment coefficient table according to the first preset adjustment step when the total time of the rotational speed adjustment phase is greater than the preset upper limit of the rotational speed adjustment phase. And when the total duration of the rotating speed adjusting stage is smaller than the preset lower limit of the rotating speed adjusting stage, reducing the torque reducing adjusting coefficient in the engine torque reducing adjusting coefficient table according to the second set adjusting step length. When the total duration of the rotation speed adjusting stage is between the preset upper limit of the rotation speed adjusting stage and the preset lower limit of the rotation speed adjusting stage, the torque reducing adjusting coefficient in the engine torque reducing adjusting coefficient table is not adjusted, and the engine torque reducing adjusting coefficient table is kept unchanged. The preset upper limit of the rotating speed adjusting stage is larger than the preset lower limit of the rotating speed adjusting stage.
And step 9, when the whole vehicle is powered down, saving the engine torque reduction adjustment coefficient into a nonvolatile memory.
In short, according to the rotating speed adjusting method provided by the invention, when the gear shifting stage is in the rotating speed adjusting stage, the clutch closed-loop control sliding function is closed, and the engine torque reduction basic value is obtained according to the rotating speed difference between the estimated engine rotating speed and the target engine rotating speed, the non-interference engine torque and the target gear table lookup; according to the engine torque without intervention and the target gear, searching an engine torque reduction adjustment coefficient table to obtain an engine torque reduction adjustment coefficient; the torque reduction of the engine is requested, the torque reduction value is the product of the torque reduction basic value of the engine and the torque reduction adjustment coefficient of the engine, namely, the torque reduction of the engine is dynamically adjusted according to the estimated rotational speed difference value of the engine rotational speed and the target rotational speed of the engine, so that the engine rotational speed is synchronous in the rotational speed adjustment process, the rotational speed adjustment duration meets the requirements through the total duration learning function of the rotational speed adjustment stage, the control method can effectively avoid adjusting the rotational speed of the engine by adjusting the clutch pressure, ensure the stability of torque transmission of the clutch, and improve the smoothness of the whole vehicle in the rotational speed adjustment process.
The present embodiment also provides a vehicle including the double clutch automatic transmission and the power upshift rotational speed adjustment method as described above, the double clutch automatic transmission being controlled by the power upshift rotational speed adjustment method.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (7)
1. The power upshift rotating speed adjusting method is characterized by comprising the following steps of:
acquiring and confirming that the gear shifting type judged by the gear shifting coordination module is a power upshift;
judging whether the gear shifting stage is in a rotating speed adjusting stage or not;
if the gear shifting stage is in the rotating speed adjusting stage, closing the clutch closed-loop control sliding function, and activating the engine speed-reducing turn-off loop adjusting function; when the engine speed-reducing turn-off ring regulating function is activated, an engine speed-reducing basic value is obtained according to a speed difference value between the estimated engine speed and the target engine speed, the engine torque without intervention and the target gear table; according to the engine torque without intervention and the target gear, searching an engine torque reduction adjustment coefficient table to obtain an engine torque reduction adjustment coefficient; requesting the engine to reduce the torque, wherein the torque reduction value is the product of the engine torque reduction basic value and the engine torque reduction adjustment coefficient;
calculating engine rotational speed acceleration according to the engine rotational speed, wherein the engine rotational speed is acquired by a rotational speed sensor;
Obtaining a predicted engine speed according to the current engine speed, the engine speed acceleration and the preset duration;
Judging whether the difference value between the estimated engine speed and the high-gear clutch speed is smaller than the speed limit value;
when the estimated engine speed and the high gear clutch speed are smaller than the speed limit value, the engine speed-reducing turn-off loop adjusting function is closed, the clutch closed-loop control sliding function is opened, and the speed adjusting stage is exited.
2. The power upshift rotation speed adjustment method according to claim 1, wherein when a rotation speed adjustment phase is exited, a rotation speed adjustment phase total duration learning function is activated;
When the total duration learning function of the rotating speed adjusting stage is activated, calculating the total duration of the rotating speed adjusting stage, increasing the torque reducing adjustment coefficient in the engine torque reducing adjustment coefficient table according to a first preset adjustment step length when the total duration of the rotating speed adjusting stage is larger than the preset upper limit of the rotating speed adjusting stage, reducing the torque reducing adjustment coefficient in the engine torque reducing adjustment coefficient table according to a second preset adjustment step length when the total duration of the rotating speed adjusting stage is smaller than the preset lower limit of the rotating speed adjusting stage, and not adjusting the torque reducing adjustment coefficient in the engine torque reducing adjustment coefficient table when the total duration of the rotating speed adjusting stage is between the preset upper limit of the rotating speed adjusting stage and the preset lower limit of the rotating speed adjusting stage.
3. The power upshift rotational speed adjustment method according to claim 2, wherein when the whole vehicle is powered down, an engine torque down adjustment coefficient is stored in a nonvolatile memory.
4. The power upshift rotation speed adjustment method according to claim 1, wherein the preset time period is set to 25ms to 85ms.
5. The power upshift rotational speed adjustment method according to claim 1, wherein the engine target rotational speed is obtained by calculation by the engine target rotational speed calculation module according to a preset smooth curve based on the high clutch rotational speed, the low clutch rotational speed, and the target slip, the target slip being set to 0 to 105rpm.
6. The power upshift rotation speed adjustment method according to claim 1, wherein the rotation speed limit value is set to 15rpm-105rpm.
7. A vehicle comprising a double clutch automatic transmission controlled by the power upshift rotational speed adjustment method according to any one of claims 1 to 6.
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| CN202210417437.XA CN114658841B (en) | 2022-04-20 | 2022-04-20 | Power upshift rotating speed adjusting method and vehicle |
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| CN117841970A (en) * | 2022-09-30 | 2024-04-09 | 广州汽车集团股份有限公司 | Gear shifting control method, gear shifting control system and dual-motor vehicle |
| CN116279497B (en) * | 2023-02-20 | 2024-03-26 | 中国第一汽车股份有限公司 | Torque control method, device, equipment, vehicle and medium |
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