CN115750777A - Downshift method and device for double-clutch transmission, vehicle and storage medium - Google Patents
Downshift method and device for double-clutch transmission, vehicle and storage medium Download PDFInfo
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- CN115750777A CN115750777A CN202310023410.7A CN202310023410A CN115750777A CN 115750777 A CN115750777 A CN 115750777A CN 202310023410 A CN202310023410 A CN 202310023410A CN 115750777 A CN115750777 A CN 115750777A
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Abstract
The invention discloses a downshift method and device for a double-clutch transmission, a vehicle and a storage medium. The method comprises the following steps: under the condition that the double-clutch transmission is in braking downshift, obtaining initial oil filling pressure and a set pressure deviation value of a target transmission, wherein the initial oil filling pressure is corresponding oil filling pressure when the target clutch is attached to a semi-linkage position, the set pressure deviation value is determined based on clutch pressure and brake master cylinder pressure corresponding to a torque deviation value, and the torque deviation value is torque deviation data corresponding to a current gear and the target gear; a target fill pressure for the target clutch is determined based on the initial fill pressure and the set pressure offset value. According to the invention, the consistency of the power transmission direction of the transmission system when the vehicle is in downshift is realized, the tooth surface switching noise caused by the target gear engaging process can be effectively avoided, and the user experience is improved.
Description
Technical Field
The invention relates to the field of vehicle control, in particular to a downshift method and device for a double-clutch transmission, a vehicle and a storage medium.
Background
Dual clutch transmissions are increasingly being used in vehicles. Under different gear shifting modes, particularly under the braking and gear-shifting working condition of a transmission, along with the continuous reduction of the gear and the current running speed of a vehicle, after a target gear shifting fork is pushed by a gear engaging force, the rotating speed of a target clutch is caused to be higher than the rotating speed of a current engine, at the moment, if oil is filled according to normal half-junction point pressure, the negative torque of the engine is transmitted by a corresponding shafting of the target clutch, an output module of the transmission is switched into reverse tooth surface meshing, and tooth surface switching noise and impact are generated due to the existence of a transmission system gap.
Disclosure of Invention
The invention provides a downshift method and device of a double-clutch transmission, a vehicle and a storage medium, and aims to solve the problem of tooth surface switching noise caused by the downshift process of the conventional double-clutch transmission.
According to one aspect of the present invention, there is provided a method of downshifting a dual clutch transmission, the method comprising:
under the condition that the double-clutch transmission is in braking downshift, obtaining initial oil filling pressure and a set pressure deviation value of a target transmission, wherein the initial oil filling pressure is corresponding oil filling pressure when the target clutch is attached to a semi-linkage position, the set pressure deviation value is determined based on clutch pressure and brake master cylinder pressure corresponding to a torque deviation value, and the torque deviation value is torque deviation data corresponding to a current gear and the target gear;
a target fill pressure for the target clutch is determined based on the initial fill pressure and the set pressure offset value.
According to another aspect of the present invention, there is provided a dual clutch transmission downshift device comprising:
the acquisition module is used for acquiring initial oil filling pressure and a set pressure deviation value of a target transmission under the condition that the double-clutch transmission is in braking downshift, wherein the initial oil filling pressure is corresponding oil filling pressure when the target clutch is attached to a semi-linkage position, the set pressure deviation value is determined based on clutch pressure and brake master cylinder pressure corresponding to a torque deviation value, and the torque deviation value is torque deviation data corresponding to a current gear and a target gear;
and the oil filling pressure determining module is used for determining the target oil filling pressure of the target clutch according to the initial oil filling pressure and the set pressure deviation value.
According to another aspect of the present invention, there is provided a vehicle including:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores a computer program executable by the at least one processor, the computer program being executable by the at least one processor to enable the at least one processor to perform the dual clutch transmission downshift method of any one of the embodiments of the invention.
According to another aspect of the present invention, there is provided a computer readable storage medium having stored thereon computer instructions for causing a processor to execute the method for downshifting a dual clutch transmission according to any one of the embodiments of the present invention.
According to the technical scheme, under the condition that the double-clutch transmission is in braking downshift, the initial oil filling pressure and the set pressure deviation value of the target transmission are obtained, the initial oil filling pressure is the corresponding oil filling pressure when the target clutch is attached to the semi-linkage position, the set pressure deviation value is determined based on the clutch pressure and the brake master cylinder pressure corresponding to the torque deviation value, and the torque deviation value is the torque deviation data corresponding to the current gear and the target gear; the target oil charging pressure of the target clutch is determined according to the initial oil charging pressure and the set pressure deviation value, so that the consistency of the power transmission directions of the transmission system is realized when the vehicle is downshifted, the tooth surface switching noise caused by the target gear engaging process can be effectively avoided, and the user experience is improved.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method of downshifting a dual clutch transmission according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of a dual clutch transmission downshift method provided by the embodiment of the present invention;
FIG. 3 is a flow chart of another dual clutch transmission downshift method provided by the embodiment of the invention;
FIG. 4 is a block diagram of a dual clutch transmission downshift device provided by the embodiment of the invention;
fig. 5 is a block diagram of a vehicle according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is to be understood that the terms "target" and "initial" and the like in the description and claims of the invention and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a flowchart of a downshift method for a dual clutch transmission according to an embodiment of the present invention, where the embodiment is applicable to a downshift scenario of the dual clutch transmission, and particularly, the embodiment is more applicable to a case where the dual clutch transmission is in a brake downshift. The method may be performed by a dual clutch transmission downshift device, which may be implemented in hardware and/or software, or may be configured in a vehicle.
As shown in fig. 1, the dual clutch transmission downshift method includes the steps of:
s110, under the condition that the double-clutch transmission is in braking downshift, obtaining initial oil filling pressure and a set pressure deviation value of the target transmission, wherein the initial oil filling pressure is corresponding oil filling pressure when the target clutch is attached to a semi-linkage position, the set pressure deviation value is determined based on clutch pressure and brake master cylinder pressure corresponding to the torque deviation value, and the torque deviation value is torque deviation data corresponding to the current gear and the target gear.
A double clutch transmission (DSG) employs two clutches, which are respectively on odd and even shafts of the transmission, wherein the clutch of the odd shaft is responsible for odd gears (1, 3, 5, 7), and the clutch of the even shaft is responsible for even gears (2, 4, 6).
The downshift of the DSG is controlled by an Electronic Control Unit (ECU), which is also called a "traveling computer" or an "on-board computer". The ECU consists of a Microcontroller (MCU), a memory (ROM, RAM), an input/output interface (I/O), an analog-to-digital converter (A/D), a shaping circuit, a driving circuit and other large-scale integrated circuits. When stepping on an accelerator pedal, the ECU judges the process of upshifting; when the brake pedal is stepped on, the ECU determines a downshift process.
The current gear is the gear at the moment when the brake downshift of the dual clutch transmission occurs, and the current gear is larger than the target gear, for example, the target gear may be gear 2, and the current gear may be gear 3.
A master cylinder is an important component in a hydraulic brake system for an automobile for converting a control force into a hydraulic pressure. The change rate of the pressure of the brake master cylinder reflects the magnitude of the braking strength of the driver, and the larger the change rate is, the stronger the braking intention of the driver is. Furthermore, the master cylinder pressure of the brake downshift can be judged through a set threshold, and the master cylinder pressure is greater than the set threshold under the condition that the double-clutch transmission is in the brake downshift.
Wherein, the half-linkage position is at half of the whole range of the clutch pedal. When the target clutch is attached to the half-linked position, the engine starts to transmit power, and at the same time, the power of the engine is consumed, and the engine speed is reduced.
The set pressure deviation value is a pressure value which is required to be reduced when the target clutch brake is shifted down from the current gear to the target gear.
The torque offset value is the torque value that the target clutch brake downshift from the current gear to the target gear needs to be reduced.
Further, when the double-clutch transmission meets the following braking downshift conditions, the double clutch is judged to be in the braking downshift condition, and the braking downshift conditions comprise the following four conditions, specifically:
(1) And the rotating speed of the engine enters an idling interval, and the engine recovers oil supply.
Where idle refers to the engine speed operating in neutral. When the engine runs, the accelerator pedal is completely released, and the engine is in an idling state. The speed at which the engine idles is referred to as an idle speed.
The idle speed interval refers to an interval from a target idle speed to a sum of a target idle speed and an offset value, wherein the target idle speed is preferably 800 rpm, the offset value is preferably 100 rpm, and the corresponding idle speed interval is 800-900 rpm.
(2) The vehicle is in a coasting state or a braking state.
When the vehicle with the double-clutch transmission is in a gear-shifting sliding state, the engine can not spray oil, and when the vehicle is shifted to an idling state and slides in a neutral gear, the engine can continuously spray oil.
The braking means that in the process of driving, service braking, namely foot braking, is adopted, so that the vehicle is decelerated and stopped in the process of advancing.
(3) The target gear is smaller than the current gear, and the target gear shifting fork is already at the meshing position.
The shifting fork is used for shifting gears of the clutch, is arranged in a structure for controlling the engagement and the disengagement of the clutch in the gear shifting process, is connected with a speed changing handle and is used for changing the input/output rotating speed ratio.
(4) And the ratio of the clutch rotating speed corresponding to the target gear to the output shaft rotating speed is in a set ratio range.
And S120, determining the target oil filling pressure of the target clutch according to the initial oil filling pressure and the set pressure deviation value.
The target fill pressure for the target clutch is the difference between the initial fill pressure and the set pressure offset value.
Further, after S120, the method further includes:
and controlling the target clutch to fill oil according to the target oil filling pressure until the transmission downshift operation is executed when the engine rotating speed is detected to be suitable for the target clutch rotating speed.
The target oil filling pressure is generated based on the set pressure deviation value, and the target oil filling pressure is reduced by introducing the set pressure deviation value (see fig. 2), so that the target oil filling pressure does not enable the system to be switched to a reverse driving state, under the condition that the gear is completely engaged, the target clutch is controlled to fill oil according to the target oil filling pressure, and when the target clutch rotating speed is detected to be matched with the engine rotating speed, the gear shifting operation of the transmission is executed, so that the tooth surface is kept in a forward torque transmission state consistently, and the impact of frequent switching of the tooth surface contact state caused by the target clutch oil filling torque transmission in the gear shifting process is prevented.
According to the technical scheme, the initial oil filling pressure and the set pressure deviation value of the target transmission are obtained under the condition that the double-clutch transmission is in the brake downshift state, the initial oil filling pressure is the corresponding oil filling pressure when the target clutch is attached to the semi-linkage position, the set pressure deviation value is determined based on the clutch pressure corresponding to the torque deviation value and the brake master cylinder pressure, the torque deviation value is the torque deviation data corresponding to the current gear and the target gear, the target oil filling pressure of the target clutch is determined according to the initial oil filling pressure and the set pressure deviation value, the consistency of the power transmission direction of the transmission system is achieved when the vehicle is in the downshift state, tooth surface switching noise caused by the target gear engaging process can be effectively avoided, and user experience is improved.
Fig. 3 is a flowchart of another downshift method for a dual clutch transmission according to an embodiment of the present invention, which belongs to the same inventive concept as the downshift method for a dual clutch transmission according to the above embodiment, and further describes a process of determining a set pressure offset value, a clutch pressure corresponding to a torque offset value, and a pressure offset value corresponding to a master cylinder pressure on the basis of the above embodiment.
As shown in fig. 3, the dual clutch transmission downshift method includes the steps of:
s210, under the condition that the double-clutch transmission is in a braking downshift state, obtaining initial oil filling pressure of the target transmission, wherein the initial oil filling pressure is corresponding oil filling pressure when the target clutch is attached to a semi-linkage position.
In one embodiment, the target transmission has an initial oil fill pressure of 2.5 Bar.
S220, linearly weighting the clutch pressure corresponding to the torque deviation value and the brake master cylinder pressure deviation value corresponding to the brake master cylinder pressure to obtain a set pressure deviation value.
The pressure offset value is set as the sum of the clutch pressure corresponding to the torque offset value and the master cylinder pressure offset value corresponding to the master cylinder pressure.
Further, determining a clutch pressure corresponding to the torque offset value includes the steps of:
and b1, calculating a difference value between the gear speed ratio corresponding to the target gear and the current gear speed ratio corresponding to the current gear, and a ratio of the difference value to the target gear speed ratio.
In one embodiment, the gear ratios are as shown in Table 1:
TABLE 1 Gear ratio table
| Gear position | G1 | G2 | G3 | G4 | G5 | G6 | G7 |
| Speed ratio | 16.077 | 9.813 | 6.442 | 4.691 | 3.804 | 3.116 | 2.521 |
The gears comprise 7 gears, G1-G5 correspond to gears 1 to 5, G6 corresponds to a gear R, and G7 corresponds to a gear N. When the target gear is the 2-gear and the current gear is the 3-gear, the gear speed ratio corresponding to the current gear is 6.442, the gear speed ratio corresponding to the target gear is 9.813, the difference value between the gear speed ratio corresponding to the target gear and the current gear speed ratio corresponding to the current gear is 9.813-6.442=3.371, and the ratio value between the difference value and the target gear speed ratio is 3.371/9.813=0.34.
And b2, determining a torque offset value according to the current engine torque and the ratio.
The torque offset value is the current engine torque multiplied by the ratio.
In one embodiment, the current engine torque is 10Nm, and therefore, the torque offset value is the product of the current engine torque and the torque, specifically: 10 × 0.34=3.4nm.
And b3, determining the clutch pressure according to the torque deviation value and the corresponding relation between the pre-stored torque deviation value and the clutch pressure.
In one embodiment, the prestored torque offset value versus clutch pressure is shown in Table 2:
TABLE 2 Torque offset versus Clutch pressure
| Torque offset value (Nm) | 0 | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 |
| Clutch pressure (Bar) | 0 | 0.05 | 0.1 | 0.15 | 0.2 | 0.25 | 0.3 | 0.35 | 0.4 | 0.45 | 0.5 |
In one embodiment, the torque offset value is 3.4Nm. The torque offset values in Table 2 have values of 2 and 4,2 and 4 intermediate 3,3.4 greater than 3, thus rounding up to 4, and thus the torque offset value corresponds to a clutch pressure of 0.1Bar.
Further, the step of determining the pressure deviation value corresponding to the pressure of the brake master cylinder comprises the following steps:
and c1, acquiring the pressure of the brake master cylinder and the current oil temperature of the target transmission.
And c2, determining a brake master cylinder pressure deviation value corresponding to the brake master cylinder pressure according to the brake master cylinder pressure and the current oil temperature and the pre-established corresponding relationship among the oil temperature, the brake master cylinder pressure and the brake master cylinder pressure deviation value.
In one embodiment, the correspondence between the oil temperature, the master cylinder pressure, and the master cylinder pressure offset value is shown in the master cylinder pressure offset value configuration table of table 3, which includes at least one oil temperature field, at least one master cylinder pressure field, and the master cylinder pressure offset value corresponding to the master cylinder pressure field for each oil temperature field.
Further, before determining the master cylinder pressure offset value, the method further comprises:
and acquiring a vehicle running mode identifier, and determining the corresponding relation between the oil temperature corresponding to the vehicle running mode identifier, the pressure of the brake master cylinder and the pressure deviation value of the brake master cylinder.
In one embodiment, the vehicle is configured with at least two modes, each configured with a corresponding master cylinder pressure offset value configuration table.
TABLE 3 brake master cylinder pressure deviant configuration table
As can be seen from Table 3, when the oil temperature is 90 degrees Celsius, the brake master cylinder pressure offset value corresponding to the brake master cylinder pressure 25Bar is 0.5Bar. Therefore, the corresponding set pressure offset value is the sum of the clutch pressure 0.1Bar corresponding to the torque offset value and the brake master cylinder pressure offset value 0.5Bar corresponding to the brake master cylinder pressure, 0.5+0.1=0.6Bar.
And S230, determining the target oil filling pressure of the target clutch according to the initial oil filling pressure and the set pressure deviation value.
The target fill pressure for the target clutch is the difference between the initial fill pressure and the set pressure offset value.
In one embodiment, the target transmission initial oil fill pressure is 2.5 Bar and the target oil fill pressure is 2.5-0.6=1.9Bar.
According to the technical scheme of the embodiment of the invention, the initial oil charging pressure of the target transmission is obtained under the condition that the double-clutch transmission is in braking downshift, and the initial oil charging pressure is the corresponding oil charging pressure when the target clutch is attached to the semi-linkage position; linearly weighting the clutch pressure and the brake master cylinder pressure corresponding to the torque deviation value to obtain a set pressure deviation value; a target fill pressure for the target clutch is determined based on the initial fill pressure and the set pressure offset value. According to the technical scheme of the embodiment of the invention, the consistency of the power transmission direction of the transmission system when the vehicle is downshifted is realized, the tooth surface switching noise caused by the target gear engaging process can be effectively avoided, and the user experience is improved.
Fig. 4 is a structural block diagram of a downshift device of a dual clutch transmission according to an embodiment of the present invention, where the embodiment is applicable to a scenario of dual clutch downshift, and in particular, the embodiment is more applicable to a situation where the dual clutch transmission is in a brake downshift. The device can be implemented in hardware and/or software, and can also be configured in a vehicle.
As shown in fig. 4, the downshift device of a dual clutch transmission includes:
the obtaining module 410 is configured to obtain an initial oil filling pressure and a set pressure offset value of the target transmission when the dual clutch transmission is in a brake downshift state, where the initial oil filling pressure is an oil filling pressure corresponding to a half-linkage position to which the target clutch is attached, the set pressure offset value is determined based on a clutch pressure and a brake master cylinder pressure corresponding to the torque offset value, and the torque offset value is torque offset data corresponding to a current gear and the target gear;
a fill pressure determination module 420 determines a target fill pressure for the target clutch based on the initial fill pressure and the set pressure offset value.
Optionally, the obtaining module 410 is further configured to:
and linearly weighting the clutch pressure corresponding to the torque deviation value and the brake master cylinder pressure deviation value corresponding to the brake master cylinder pressure to obtain the set pressure deviation value.
Optionally, the obtaining module 410 is further configured to:
calculating a difference value of a gear speed ratio corresponding to the target gear and a current gear speed ratio corresponding to the current gear, and a ratio of the difference value to the target gear speed ratio;
determining a torque offset value based on the current engine torque and the ratio;
and determining the clutch pressure according to the torque offset value and the corresponding relation between the pre-stored torque offset value and the clutch pressure.
Optionally, the obtaining module 410 is further configured to:
acquiring the pressure of a brake master cylinder and the current oil temperature of a target transmission;
and determining a brake master cylinder pressure deviation value corresponding to the brake master cylinder pressure according to the brake master cylinder pressure and the current oil temperature and the pre-established corresponding relationship among the oil temperature, the brake master cylinder pressure and the brake master cylinder pressure deviation value.
Optionally, the brake downshift condition comprises:
the rotating speed of the engine enters an idling interval, and the engine recovers oil supply;
the vehicle is in a sliding state or a braking state;
the target gear is smaller than the current gear, and the target gear shifting fork is already at the meshing position;
the ratio of the corresponding clutch rotating speed of the target gear to the output shaft rotating speed is within a set ratio range.
Optionally, the oil charge pressure determination module 420 is further configured to:
and controlling the target clutch to fill oil according to the target oil filling pressure until the transmission downshift operation is executed when the engine rotating speed is detected to be suitable for the rotating speed of the target clutch.
Optionally, the oil charge pressure determination module 420 is further configured to:
and acquiring a vehicle running mode identifier, and determining the corresponding relation between the oil temperature corresponding to the vehicle running mode identifier, the pressure of the brake master cylinder and the pressure deviation value of the brake master cylinder.
According to the technical scheme, the initial oil filling pressure and the set pressure deviation value of the target transmission are obtained under the condition that the double-clutch transmission is in the brake downshift state, the initial oil filling pressure is the corresponding oil filling pressure when the target clutch is attached to the semi-linkage position, the set pressure deviation value is determined based on the clutch pressure corresponding to the torque deviation value and the brake master cylinder pressure, the torque deviation value is the torque deviation data corresponding to the current gear and the target gear, the target oil filling pressure of the target clutch is determined according to the initial oil filling pressure and the set pressure deviation value, the consistency of the power transmission direction of the transmission system is achieved when the vehicle is in the downshift state, tooth surface switching noise caused by the target gear engaging process can be effectively avoided, and user experience is improved.
The dual clutch transmission downshift device provided by the embodiment of the invention can execute the downshift method of the dual clutch transmission provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
Fig. 5 is a block diagram of a vehicle according to an embodiment of the present invention, and as shown in fig. 5, the vehicle 10 includes at least one processor 11, and a memory communicatively connected to the at least one processor 11, such as a Read Only Memory (ROM) 12, a Random Access Memory (RAM) 13, and the like, wherein the memory stores a computer program executable by the at least one processor, and the processor 11 can execute various suitable actions and processes according to the computer program stored in the Read Only Memory (ROM) 12 or the computer program loaded from the storage unit 18 into the Random Access Memory (RAM) 13. In the RAM 13, various programs and data necessary for the operation of the electronic apparatus 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other via a bus 14. An input/output (I/O) interface 15 is also connected to the bus 14.
Various components in the vehicle 10 are connected to the I/O interface 15, including: an input unit 16 such as a keyboard or a mouse; an output unit 17 such as various types of displays or speakers; a storage unit 18 such as a magnetic disk or an optical disk; and a communication unit 19 such as a network card, modem, or wireless communication transceiver. The communication unit 19 allows the vehicle 10 to exchange information/data with other devices via a computer network such as the internet and/or various telecommunication networks.
In some embodiments, the dual clutch transmission downshift method may be implemented as a computer program tangibly embodied on a computer readable storage medium, such as the memory unit 18. In some embodiments, part or all of the computer program may be loaded and/or installed on the vehicle 10 via the ROM 12 and/or the communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the dual clutch transmission downshift method described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform the dual clutch transmission downshift method in any other suitable manner (e.g., by way of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuitry, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), system on a chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs that are executable and/or interpretable on a programmable system including at least one programmable processor, which may be special or general purpose, receiving data and instructions from, and transmitting data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be performed. A computer program can execute entirely on a machine or partly on a machine, partly on a machine and partly on a remote machine or entirely on a remote machine or server as a stand-alone software package.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. A computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described herein may be implemented on a vehicle 10 having: a Display device (e.g., a CRT (Cathode Ray Tube) or LCD (Liquid Crystal Display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) by which a user may provide input to the vehicle 10. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic, speech, or tactile input.
It should be understood that various forms of the flows shown above, reordering, adding or deleting steps, may be used. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method of downshifting a dual clutch transmission, comprising:
under the condition that the double-clutch transmission is in braking downshift, acquiring initial oil charging pressure and a set pressure deviation value of a target transmission, wherein the initial oil charging pressure is corresponding oil charging pressure when a target clutch is attached to a semi-linkage position, the set pressure deviation value is determined based on clutch pressure and brake master cylinder pressure corresponding to a torque deviation value, and the torque deviation value is torque deviation data corresponding to a current gear and a target gear;
and determining the target oil filling pressure of the target clutch according to the initial oil filling pressure and the set pressure deviation value.
2. The method of claim 1, wherein determining the set pressure offset value comprises:
and linearly weighting the clutch pressure corresponding to the torque deviation value and the brake master cylinder pressure deviation value corresponding to the brake master cylinder pressure to obtain a set pressure deviation value.
3. The method of claim 2, wherein determining the clutch pressure for the torque offset value comprises:
calculating a difference value between a gear speed ratio corresponding to the target gear and a current gear speed ratio corresponding to a current gear, and a ratio of the difference value to the target gear speed ratio;
determining the torque offset value based on a current engine torque and the ratio;
and determining the clutch pressure according to the torque deviation value and the corresponding relation between the pre-stored torque deviation value and the clutch pressure.
4. The method of claim 2, wherein determining the pressure offset value for the master cylinder pressure by:
acquiring the pressure of a brake master cylinder and the current oil temperature of a target transmission;
and determining the pressure deviation value of the brake master cylinder corresponding to the pressure of the brake master cylinder according to the pressure of the brake master cylinder and the current oil temperature as well as the pre-established corresponding relationship among the oil temperature, the pressure of the brake master cylinder and the pressure deviation value of the brake master cylinder.
5. The method of claim 1, wherein the dual clutch is determined to be in a brake downshift condition when the dual clutch transmission meets a brake downshift condition comprising:
the engine speed enters an idle speed interval, and the engine recovers oil supply;
the vehicle is in a sliding state or a braking state;
the target gear is smaller than the current gear, and the target gear shifting fork is already at an engagement position;
and the ratio of the clutch rotating speed corresponding to the target gear to the output shaft rotating speed is within a set ratio range.
6. The method of any of claims 1-5, wherein after determining the target fill pressure for the target clutch based on the initial fill pressure and the set pressure offset value, further comprising:
and controlling the target clutch to fill oil according to the target oil filling pressure until the transmission downshift operation is executed when the engine rotating speed is detected to be matched with the rotating speed of the target clutch.
7. The method of claim 4, prior to determining the master cylinder pressure offset value, further comprising:
and acquiring a vehicle running mode identifier, and determining the corresponding relation between the oil temperature corresponding to the vehicle running mode identifier, the pressure of the brake master cylinder and the pressure deviation value of the brake master cylinder.
8. A downshift device for a dual clutch transmission, comprising:
the device comprises an acquisition module, a judgment module and a control module, wherein the acquisition module is used for acquiring initial oil filling pressure and a set pressure deviation value of a target transmission under the condition that the double-clutch transmission is in brake downshift, the initial oil filling pressure is corresponding oil filling pressure when a target clutch is attached to a semi-linkage position, the set pressure deviation value is determined based on clutch pressure and brake master cylinder pressure corresponding to a torque deviation value, and the torque deviation value is torque deviation data corresponding to a current gear and a target gear;
and the oil filling pressure determining module is used for determining the target oil filling pressure of the target clutch according to the initial oil filling pressure and the set pressure deviation value.
9. A vehicle, characterized in that the vehicle comprises:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the dual clutch transmission downshift method of any one of claims 1-7.
10. A computer readable storage medium storing computer instructions for causing a processor to perform the dual clutch transmission downshift method of any one of claims 1-7 when executed.
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| CN202310023410.7A CN115750777B (en) | 2023-01-09 | 2023-01-09 | Method, device, vehicle and storage medium for downshifting double clutch transmission |
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| CN202310023410.7A CN115750777B (en) | 2023-01-09 | 2023-01-09 | Method, device, vehicle and storage medium for downshifting double clutch transmission |
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| CN115750777B CN115750777B (en) | 2023-04-25 |
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| CN105570448A (en) * | 2016-01-15 | 2016-05-11 | 上海汽车变速器有限公司 | Low-temperature gear shifting optimized control method of wet type double-clutch transmission |
| CN113187891A (en) * | 2021-05-20 | 2021-07-30 | 中国第一汽车股份有限公司 | Gear shifting method of brake compensation strategy of automatic transmission |
| CN113236768A (en) * | 2021-05-25 | 2021-08-10 | 盛瑞传动股份有限公司 | Vehicle control method, vehicle control device, computer equipment and storage medium |
| CN114962632A (en) * | 2022-05-27 | 2022-08-30 | 中国第一汽车股份有限公司 | Gear engaging and disengaging force determining method and device, electronic equipment and storage medium |
| CN115143277A (en) * | 2022-06-17 | 2022-10-04 | 中国第一汽车股份有限公司 | Gear shifting control method, shifting fork control method and system for double-clutch transmission, double-clutch transmission and automobile with double-clutch transmission |
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| CN105570448A (en) * | 2016-01-15 | 2016-05-11 | 上海汽车变速器有限公司 | Low-temperature gear shifting optimized control method of wet type double-clutch transmission |
| CN113187891A (en) * | 2021-05-20 | 2021-07-30 | 中国第一汽车股份有限公司 | Gear shifting method of brake compensation strategy of automatic transmission |
| CN113236768A (en) * | 2021-05-25 | 2021-08-10 | 盛瑞传动股份有限公司 | Vehicle control method, vehicle control device, computer equipment and storage medium |
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| CN115750777B (en) | 2023-04-25 |
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