CN111963676B - Automobile and control method and controller of wet type dual-clutch transmission of automobile - Google Patents
Automobile and control method and controller of wet type dual-clutch transmission of automobile Download PDFInfo
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- CN111963676B CN111963676B CN201910419489.9A CN201910419489A CN111963676B CN 111963676 B CN111963676 B CN 111963676B CN 201910419489 A CN201910419489 A CN 201910419489A CN 111963676 B CN111963676 B CN 111963676B
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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
- F16H61/06—Smoothing ratio shift by controlling rate of change of fluid pressure
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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
- F16H61/06—Smoothing ratio shift by controlling rate of change of fluid pressure
- F16H61/061—Smoothing ratio shift by controlling rate of change of fluid pressure using electric control means
- F16H2061/062—Smoothing ratio shift by controlling rate of change of fluid pressure using electric control means for controlling filling of clutches or brake servos, e.g. fill time, fill level or pressure during filling
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
Abstract
The invention discloses an automobile and a control method and a controller of a wet type double-clutch transmission thereof, wherein the control method specifically comprises the following steps: and when the stop time length of the engine before the engine is started is judged to be greater than or equal to the preset reference time length, after the odd-numbered clutch is completely combined and before the even-numbered clutch starts to be combined, controlling the electromagnetic valve of the even-numbered clutch to switch back and forth between the first conduction position and the second conduction position so that the hydraulic cylinder of the even-numbered clutch is repeatedly filled with oil and returned. The control method controls the hydraulic cylinders of the even-numbered clutches to repeatedly charge oil and return oil, so that air in oil pipes and oil cavities of the hydraulic cylinders is exhausted, and the gear shifting pause and contusion phenomenon when the 1 gear is shifted up to the 2 gear can be relieved. In addition, the control method leads the repeated oil filling and returning of the hydraulic cylinder to occur in the time period after the odd-numbered clutch is completely combined and before the even-numbered clutch starts to be combined in the running process of the vehicle, so that the influence on the normal starting time of the vehicle can be avoided on one hand, and the impact feeling caused when the even-numbered clutch is filled with oil can be avoided on the other hand.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a control method and a controller of a wet type double-clutch transmission.
Background
Double Clutch Transmission (DCT) has the advantages of high Transmission efficiency, low oil consumption, and the like, and is more and more favored by home and abroad automobile host factories in recent years. One mainstream dual clutch transmission is a wet dual clutch transmission.
The wet type double-clutch gearbox comprises two clutches which work independently, wherein one clutch is an odd clutch and used for transmitting power of an odd gear, and the other clutch is an even clutch and used for transmitting power of an even gear. When the engine is started, the odd-numbered clutch is firstly combined to realize 1-gear starting, when the vehicle speed reaches the gear shifting point of 1-gear upshifting 2-gear, the odd-numbered clutch is disengaged, and the even-numbered clutch is combined to realize 1-gear upshifting 2-gear.
The even number clutch comprises a hydraulic cylinder, an oil pipe and a three-position three-way electromagnetic valve, wherein one end of the oil pipe is connected with an oil hole of the hydraulic cylinder, and the other end of the oil pipe is connected with a valve port of the electromagnetic valve. When the electromagnetic valve is in the first conduction position, the oil pipe is communicated with the oil pump to realize oil feeding, when the electromagnetic valve is in the second conduction position, the oil pipe is communicated with the oil pan to realize oil return, when the electromagnetic valve is in the closing position, the oil pipe is closed, and at the moment, oil feeding and oil return are avoided.
In practical application, the finding that the vehicle type equipped with the wet type double-clutch transmission has a pause and frustration feeling when the engine is stopped for a period of time and then started to shift up to 2 gears influences the gear shifting comfort, and how to avoid the defect is the technical problem to be solved by the technical personnel in the field.
Disclosure of Invention
In order to solve the above technical problems, the inventors first analyzed the reasons for the above drawbacks. The analysis finds that: after the engine stops for a period of time, oil in the oil cavity of the hydraulic cylinder of the even-numbered clutch leaks back to the oil bottom shell from the sealing part under the action of hydraulic potential energy, so that air enters the oil pipe and the oil cavity of the even-numbered clutch. When the engine is started again and then is shifted up by 2, the oil filling is slow due to the fact that air is filled in the oil pipe and the oil cavity of the even number clutch, and therefore the gear shifting pause and frustration phenomenon can occur. Therefore, before the even number of clutches are combined, air in the oil pipe and the oil cavity is exhausted, and the gear shifting pause and frustration phenomenon can be effectively relieved.
Therefore, the invention provides a control method of a wet type double-clutch gearbox, which specifically comprises the following steps: and when the stop time of the engine before the engine is started is judged to be greater than or equal to the preset reference time, after the odd-numbered clutch is completely combined and before the even-numbered clutch starts to be combined, controlling the electromagnetic valve of the even-numbered clutch to switch back and forth between the first conduction position and the second conduction position so that the hydraulic cylinder of the even-numbered clutch is repeatedly filled with oil and returned.
The control method controls the hydraulic cylinders of the even-numbered clutches to repeatedly charge oil and return oil, so that air in oil pipes of the even-numbered clutches and oil cavities of the hydraulic cylinders is exhausted, and the gear shifting pause and contusion phenomenon when the 1 gear is shifted up to the 2 gear can be relieved. In addition, the control method leads the repeated oil filling and returning of the hydraulic cylinder to occur in the time period after the odd-numbered clutch is completely combined and before the even-numbered clutch starts to be combined in the running process of the vehicle, so that the influence on the normal starting time of the vehicle can be avoided on one hand, and the impact feeling caused when the even-numbered clutch is filled with oil can be avoided on the other hand.
Further, in the process that the hydraulic cylinder is repeatedly filled with oil and returned with oil, the control method judges whether air in an oil cavity of the hydraulic cylinder is completely exhausted and whether the even number clutch is about to be combined, if any one of the air and the clutch is completely exhausted, the electromagnetic valve is controlled to be switched to a closed position, and the hydraulic cylinder is enabled not to be filled with oil and not to be returned with oil any more.
Further, the control method judges whether the air in the oil chamber of the hydraulic cylinder is exhausted according to the current pressure of the hydraulic cylinder and a preset target pressure.
Further, the control method judges whether the wet type dual-clutch gearbox is in a state that the odd number clutch is completely combined and the even number clutch is not combined according to the current vehicle speed and a preset reference vehicle speed, and judges whether the even number clutch is about to be combined according to the current vehicle speed and the preset reference vehicle speed.
In addition, the invention also provides a controller of the wet type double-clutch transmission, which specifically comprises the following components:
the storage module stores reference time length;
the calculation module is used for calculating the shutdown time length of the engine before the engine is started;
a first judging module and a second judging module,
the first judging module is in communication connection with the storage module, the calculating module and the second judging module, is used for judging whether the shutdown time length of the engine before the engine is started at the time is greater than or equal to the reference time length, and is configured to: if yes, sending a trigger instruction to the second judgment module;
the second judgment module is in communication connection with the electromagnetic valve of the even clutch, is used for judging whether the wet type dual-clutch gearbox is in a state that the odd clutch is completely combined and the even clutch is not combined, and is configured to: if so, sending a command of switching back and forth between the first conduction position and the second conduction position to the electromagnetic valve to enable the hydraulic cylinders of the even number clutches to repeatedly charge oil and return oil.
Further, the second determining module is further configured to determine whether air in an oil chamber of the hydraulic cylinder is completely exhausted and whether the even-numbered clutch is about to be engaged in a process of repeatedly filling oil and returning oil to the hydraulic cylinder, and is configured to: if either one of the two is true, an instruction of switching to the closing position is sent to the electromagnetic valve, so that the hydraulic cylinder is not filled with oil any more and is not returned with oil any more.
Further, the storage module also stores a reference vehicle speed; the second judgment module is also in communication connection with the storage module and the vehicle speed sensor so as to judge whether the wet type dual-clutch gearbox is in a state that the odd number clutch is completely combined and the even number clutch is not combined according to the current vehicle speed and the reference vehicle speed and judge whether the even number clutch is about to be combined according to the current vehicle speed and the reference vehicle speed.
Further, the storage module also stores a target pressure; the second judgment module is also in communication connection with a pressure sensor for detecting the current pressure of the hydraulic cylinder so as to judge whether the air in the oil cavity is exhausted or not according to the current pressure of the hydraulic cylinder and the target pressure.
In addition, the invention also provides an automobile which comprises the wet type double-clutch transmission and a controller of the wet type double-clutch transmission.
Further, the automobile is a pure oil automobile or an oil-electric hybrid automobile.
Drawings
FIG. 1 is a schematic flow chart diagram illustrating a control method according to an embodiment of the present invention;
FIG. 2 is a schematic block diagram of an embodiment of a control mechanism according to the present invention.
Wherein the reference numerals in fig. 2 are explained as follows:
the device comprises a storage module 1, a calculation module 2, a first judgment module 3 and a second judgment module 4;
01 starting a signal collector, 02 timers, 03 vehicle speed sensors and 04 pressure sensors.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution of the present invention is further described in detail below with reference to the accompanying drawings and the detailed description.
Referring to fig. 1, fig. 1 is a schematic flow chart of a control method according to an embodiment of the present invention.
As shown in fig. 1, the control method includes steps S1, S2, S3, S4, and S5, specifically:
and S1, calculating the shutdown time length of the engine before the next starting when the engine is started.
Specifically, the engine stop time before the engine is started is equal to the engine start time minus the last engine stop time.
And S2, judging whether the shutdown time length of the engine before the engine is started at the time is larger than or equal to a preset reference time length.
Specifically, the reference time length t is within a range that t is less than or equal to 5min and is more than or equal to 3 min.
S3 is executed only when it is determined at S2 that the stop time period of the engine before the next start is greater than or equal to the preset reference time period, because when the engine stop time is short, only a small amount of air enters the oil pipe and the oil chambers of the even-numbered clutches, and there is little influence on shifting comfort.
And S3, judging whether the wet type double-clutch gearbox is in a state that the odd number clutch is completely combined and the even number clutch is not combined.
Specifically, the determination may be performed according to the current vehicle speed and a preset reference vehicle speed. The specific judgment method is as follows: presetting a first reference vehicle speed and a second reference vehicle speed, wherein the range of the first reference vehicle speed v1 is that t is more than or equal to 5km/h and less than or equal to 6km/h, and the second reference vehicle speed is slightly less than the vehicle speed of a gear shifting point corresponding to 1 gear and 2 gears. If the current vehicle speed is greater than or equal to the first reference vehicle speed and less than the second reference vehicle speed, the dual clutch transmission is determined to be in a state where the odd clutch is completely engaged and the even clutch is not yet engaged (hereinafter referred to as an intermediate state).
When it is determined that the wet dual clutch transmission is in the neutral state, S4 is executed.
And S4, controlling the electromagnetic valve of the even-numbered clutch to switch back and forth between the first conduction position and the second conduction position, and enabling the hydraulic cylinder of the even-numbered clutch to repeatedly charge oil and return oil.
In the process of repeatedly filling oil and returning oil to the hydraulic cylinders of the even-numbered clutches, the oil pipes and the oil cavities of the hydraulic cylinders are controlled to be gradually discharged to an oil pan along with the hydraulic oil, so that the gear shifting pause and contusion phenomenon when the 1 gear is raised to the 2 gear can be relieved.
S5 is also executed during the repeated oil-charging and oil-returning of the hydraulic cylinder.
And S5, judging whether the air in the oil cavity of the hydraulic cylinder is completely discharged or not and whether the even number clutch is about to be combined or not, and executing S6 when either one of the air and the even number clutch is judged to be combined.
And S6, controlling the even-numbered clutches to be switched to the closing position, so that the even-numbered clutches are not filled with oil any more and are not returned with oil any more.
Because the electromagnetic valve needs to be switched to the first conduction position when the vehicle speed reaches the gear shifting point vehicle speed corresponding to 1 gear up-shift and 2 gears up, the even-numbered clutch is combined with oil filling, and the problems that when the even-numbered clutch needs to be combined, the electromagnetic valve is still in the second conduction position, oil filling is delayed, and gear shifting time is missed can be prevented through S5 and S6.
Specifically, in S5, it may be determined whether the even-numbered clutch is about to be engaged based on the current vehicle speed and a preset reference vehicle speed. More specifically, it may be determined according to the second reference vehicle speed that the even-numbered clutch is about to be engaged if the current vehicle speed is greater than or equal to the second reference vehicle speed, and at this time, the solenoid valve of the even-numbered clutch is controlled to switch to the closed position.
Specifically, in S5, it may be determined whether or not the air in the oil chamber is purged based on the current pressure of the hydraulic cylinder (hereinafter referred to as the current pressure) and a preset target pressure. The specific judgment method is as follows: a target pressure is preset that is slightly less than the pressure of the hydraulic cylinder when the even-numbered clutch is fully engaged. If the current pressure is larger than or equal to the target pressure, the air in the oil cavity of the hydraulic cylinder is judged to be exhausted, and at the moment, the electromagnetic valve of the even-numbered clutch is controlled to be switched to the closed position, so that the redundant action of the electromagnetic valve can be avoided.
In addition, the invention also provides a controller of the wet type double-clutch transmission. Referring to fig. 2, fig. 2 is a block diagram of a controller according to an embodiment of the present invention.
The controller specifically comprises a storage module 1, a calculation module 2, a first judgment module 3 and a second judgment module 4.
The storage module stores the reference time length.
The calculation module is used for calculating the shutdown time length of the engine before the engine is started. Specifically, the calculation module may be in communication connection with a start signal collector 01 that collects an engine start signal, starts calculation when receiving the start signal of the engine, and may also be in communication connection with a timer 02 that detects the stop time and the start time of the engine.
The first judging module is in communication connection with the storage module, the calculating module and the second judging module. The first judging module is used for judging whether the shutdown time length of the engine before the engine is started at the time is larger than or equal to the reference time length or not, and is configured to: if yes, a trigger instruction is sent to the second judgment module.
The second judgment module is in communication connection with the electromagnetic valve of the even clutch, is used for judging whether the wet dual-clutch transmission is in a state (hereinafter referred to as an intermediate state) that the odd clutch is completely combined and the even clutch is not combined, and is configured to: if so, sending a command of switching back and forth between the first conduction position and the second conduction position to the electromagnetic valve to enable the hydraulic cylinders of the even-numbered clutches to repeatedly charge oil and return oil.
It is understood that the communication connection may be a wired connection, a wireless connection, etc., and the two components can transmit information data to each other in a communication state.
Furthermore, the storage module further stores a reference vehicle speed, and the second judgment module is further in communication connection with the storage module and a vehicle speed sensor 03 for collecting the current vehicle speed in real time so as to judge whether the wet-type dual-clutch transmission is in the intermediate state according to the current vehicle speed and the reference vehicle speed.
Specifically, the storage module stores a first reference vehicle speed and a second reference vehicle speed, the range of the first reference vehicle speed v1 is that t is more than or equal to 5km/h and less than or equal to 6km/h, and the second reference vehicle speed is slightly less than the vehicle speed of a gear shifting point corresponding to 1 gear and 2 gears. And if the current vehicle speed is greater than or equal to the first reference vehicle speed and less than the second reference vehicle speed, determining that the double-clutch gearbox is in the intermediate state.
Further, the second judging module is further configured to judge whether air in an oil chamber of the hydraulic cylinder is completely exhausted and whether the even-numbered clutch is about to be engaged in a process of repeatedly filling oil and returning oil to the hydraulic cylinder, and is configured to: if the air in the oil cavity is completely exhausted or the even number of clutches are about to be combined, an instruction of switching to a closing position is sent to the electromagnetic valve, so that the hydraulic cylinder is not filled with oil any more and is not returned with oil any more.
Specifically, the second judgment module judges whether the even-numbered clutch is about to be combined or not according to the current vehicle speed and the reference vehicle speed. More specifically, if the current vehicle speed is greater than or equal to the second reference vehicle speed, it is determined that the even-numbered clutch is about to be engaged.
Specifically, the storage module further stores a target pressure, and the second judgment module is further in communication connection with a pressure sensor 04 for detecting the current pressure of the hydraulic cylinder, so as to judge whether the air in the oil chamber is completely discharged according to the current pressure and the target pressure of the hydraulic cylinder. More specifically, the target pressure is slightly less than the pressure of the hydraulic cylinder when the even-numbered clutch is fully engaged. If the current pressure of the hydraulic cylinder is greater than or equal to the target pressure, determining that the air in the oil chamber of the hydraulic cylinder is exhausted,
in addition, the invention also provides an automobile which comprises the wet type double-clutch transmission and the controller.
Specifically, the automobile can be a pure oil automobile or an oil-electric hybrid automobile.
The present invention provides an automobile and a control method and a controller for a wet type dual clutch transmission thereof. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A control method of a wet type double-clutch transmission is characterized in that when the stop time of an engine before starting is judged to be larger than or equal to the preset reference time, after an odd clutch is completely combined and before an even clutch starts to be combined, an electromagnetic valve of the even clutch is controlled to be switched back and forth between a first conduction position and a second conduction position, so that a hydraulic cylinder of the even clutch is repeatedly filled with oil and returned.
2. The control method according to claim 1, wherein during the process of repeatedly filling and returning the oil to the hydraulic cylinder, whether air in an oil chamber of the hydraulic cylinder is completely discharged and whether the even number of clutches are about to be combined are judged, and if one of the air and the clutches is about to be combined, the electromagnetic valve is controlled to be switched to a closed position, so that the hydraulic cylinder is not filled with oil any more and is not returned oil any more.
3. The control method according to claim 2, characterized in that it is judged whether or not air in the oil chamber thereof is purged based on the current pressure of the hydraulic cylinder and a preset target pressure.
4. The control method according to claim 2, characterized in that it is judged whether the wet dual clutch transmission is in a state where the odd clutch has been fully engaged and the even clutch has not started to be engaged, based on the current vehicle speed and a preset reference vehicle speed, and it is judged whether the even clutch is about to be engaged, based on the current vehicle speed and the preset reference vehicle speed.
5. A controller for a wet dual clutch transmission, comprising:
the storage module stores reference time length;
the calculation module is used for calculating the shutdown time length of the engine before the engine is started;
a first judging module and a second judging module,
the first judging module is in communication connection with the storage module, the calculating module and the second judging module, is used for judging whether the shutdown time length of the engine before the engine is started at the time is greater than or equal to the reference time length, and is configured to: if yes, sending a trigger instruction to the second judgment module;
the second judgment module is in communication connection with the electromagnetic valve of the even clutch, is used for judging whether the wet type dual-clutch gearbox is in a state that the odd clutch is completely combined and the even clutch is not combined, and is configured to: if so, sending a command of switching back and forth between the first conduction position and the second conduction position to the electromagnetic valve to enable the hydraulic cylinders of the even number clutches to repeatedly charge oil and return oil.
6. The controller of claim 5, wherein the second determining module is further configured to determine whether air in the oil chamber of the hydraulic cylinder is completely exhausted and whether the even clutch is about to be engaged during repeated oil-filling and oil-returning of the hydraulic cylinder, and is configured to: if either one of the two is true, an instruction of switching to the closing position is sent to the electromagnetic valve, so that the hydraulic cylinder is not filled with oil any more and is not returned with oil any more.
7. The controller of claim 6, wherein the memory module further stores a reference vehicle speed; the second judgment module is also in communication connection with the storage module and the vehicle speed sensor so as to judge whether the wet type dual-clutch gearbox is in a state that the odd number clutch is completely combined and the even number clutch is not combined according to the current vehicle speed and the reference vehicle speed and judge whether the even number clutch is about to be combined according to the current vehicle speed and the reference vehicle speed.
8. The controller of claim 6, wherein the memory module further stores a target pressure; the second judgment module is also in communication connection with a pressure sensor for detecting the current pressure of the hydraulic cylinder so as to judge whether the air in the oil cavity is exhausted or not according to the current pressure of the hydraulic cylinder and the target pressure.
9. An automobile comprising a wet dual clutch transmission, characterized by further comprising a controller of the wet dual clutch transmission according to any one of claims 5 to 8.
10. The vehicle of claim 9, wherein the vehicle is a pure oil vehicle or a hybrid oil-electric vehicle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910419489.9A CN111963676B (en) | 2019-05-20 | 2019-05-20 | Automobile and control method and controller of wet type dual-clutch transmission of automobile |
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| CN201910419489.9A CN111963676B (en) | 2019-05-20 | 2019-05-20 | Automobile and control method and controller of wet type dual-clutch transmission of automobile |
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| CN111963676B true CN111963676B (en) | 2022-02-01 |
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Citations (4)
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|---|---|---|---|---|
| US5902344A (en) * | 1996-06-27 | 1999-05-11 | Case Corporation | Manifold apparatus for calibrating clutch fill times |
| CN102753864A (en) * | 2010-02-10 | 2012-10-24 | 本田技研工业株式会社 | Hydraulic control device for automatic transmission |
| CN205745259U (en) * | 2016-04-14 | 2016-11-30 | 上海汽车集团股份有限公司 | The hydraulic control system of wet-type dual-clutch change speed gear box, change speed gear box, TCU and automobile |
| CN108426025A (en) * | 2018-03-12 | 2018-08-21 | 安徽江淮汽车集团股份有限公司 | Double-clutch automatic gearbox method of controlling exhaust gas and control system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4875384B2 (en) * | 2006-02-28 | 2012-02-15 | 本田技研工業株式会社 | Vehicle transmission |
| ITUB20153377A1 (en) * | 2015-09-03 | 2017-03-03 | Ferrari Spa | CONTROL METHOD FOR THE EXECUTION OF A GEAR CHANGE IN A TRANSMISSION PROVIDED WITH A DOUBLE CLUTCH CHANGE |
-
2019
- 2019-05-20 CN CN201910419489.9A patent/CN111963676B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5902344A (en) * | 1996-06-27 | 1999-05-11 | Case Corporation | Manifold apparatus for calibrating clutch fill times |
| CN102753864A (en) * | 2010-02-10 | 2012-10-24 | 本田技研工业株式会社 | Hydraulic control device for automatic transmission |
| CN205745259U (en) * | 2016-04-14 | 2016-11-30 | 上海汽车集团股份有限公司 | The hydraulic control system of wet-type dual-clutch change speed gear box, change speed gear box, TCU and automobile |
| CN108426025A (en) * | 2018-03-12 | 2018-08-21 | 安徽江淮汽车集团股份有限公司 | Double-clutch automatic gearbox method of controlling exhaust gas and control system |
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