CN114704624B - Control method, control device and electronic device for coaxial downshift of double-clutch transmission - Google Patents
Control method, control device and electronic device for coaxial downshift of double-clutch transmission Download PDFInfo
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- CN114704624B CN114704624B CN202210320787.4A CN202210320787A CN114704624B CN 114704624 B CN114704624 B CN 114704624B CN 202210320787 A CN202210320787 A CN 202210320787A CN 114704624 B CN114704624 B CN 114704624B
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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
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/02—Selector apparatus
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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
- F16H61/14—Control of torque converter lock-up clutches
- F16H61/143—Control of torque converter lock-up clutches using electric control means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H2061/0075—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by a particular control method
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Abstract
The invention discloses a control method, a control device and an electronic device for coaxial downshift of a double-clutch transmission. Wherein the method comprises the following steps: acquiring a power state and a clutch temperature before a vehicle downshifts, wherein the power state comprises a driving state and a non-driving state, and the clutch temperature is the maximum value of an odd clutch temperature and an even clutch temperature of the dual clutch transmission; determining a coaxial downshift strategy of the dual clutch transmission based on the power state and the clutch temperature, wherein the coaxial downshift strategy includes at least one of: a power downshift strategy, a fast power downshift strategy, and a power-off downshift strategy; control information is generated based on the on-axis downshift strategy, the control information being used to adjust a downshift schedule of the dual clutch transmission. The invention solves the technical problem that the temperature of the double-clutch transmission is too high when the vehicle downshifts.
Description
Technical Field
The invention relates to the technical field of clutch control, in particular to a control method, a control device and an electronic device for coaxial downshift of a double-clutch transmission.
Background
The double clutch transmission is based on odd and even double shaft control, and has the advantages of direct power transmission, rapid gear shifting and the like. The biaxial control power downshift is classified into a different-axis downshift and a coaxial downshift. Wherein, the abnormal shaft is quickly shifted down, and the heating value is less. The coaxial downshift is relatively slow, requiring an intermediate transition gear, and then a transition gear to a target gear. Because the coaxial downshift has long gear shifting time, large engine torque, large speed difference and large heating value, the continuous repeated coaxial downshift is extremely easy to cause overheat of the clutch surface, the transmission control system can carry out torque limiting according to the clutch surface temperature, and the heat generation is reduced by limiting the engine torque, so that the vehicle is limited to travel finally.
In the prior art, in order to solve the overheating problem of the clutch surface process, the following method is generally adopted: and comparing the clutch surface temperature value with a preset value, prohibiting coaxial downshift when the temperature exceeds a first preset value, and accelerating the gear shifting process by improving the engine speed change rate, increasing the gear shifting force and the like when the temperature exceeds a second preset value. The engine is in a large-speed-difference sliding state for a long time due to mismatching of the rotating speed adjusting process and the gear shifting process, so that the heating value is greatly increased, the problem that the gear shifting noise is generated due to overlarge gear shifting force is solved, the continuous rising of the surface temperature of the clutch cannot be completely avoided, and finally the driving is limited. The method limits the trial driving intention of the driver when the temperature does not exceed the first preset value, the problem of gear shifting noise and gear shifting impact can be caused when the temperature does not exceed the second preset value and the influence of the control method is controlled, and further increase of the temperature cannot be truly avoided.
Aiming at the problem that the temperature of the double clutch transmission is too high during vehicle downshift in the prior art, no effective solution is proposed at present.
Disclosure of Invention
The embodiment of the invention provides a control method, a control device and an electronic device for coaxial downshift of a double-clutch transmission, which are used for at least solving the technical problem that the temperature of the double-clutch transmission is too high during vehicle downshift.
According to an aspect of an embodiment of the present invention, there is provided a control method for a coaxial downshift of a dual clutch transmission, including: acquiring a power state and a clutch temperature before a vehicle downshifts, wherein the power state comprises a driving state and a non-driving state, and the clutch temperature is the maximum value of an odd clutch temperature and an even clutch temperature of the dual clutch transmission; determining a coaxial downshift strategy of the dual clutch transmission based on the power state and the clutch temperature, wherein the coaxial downshift strategy includes at least one of: a power downshift strategy, a fast power downshift strategy, and a power-off downshift strategy; control information is generated based on the on-axis downshift strategy, the control information being used to adjust a downshift schedule of the dual clutch transmission.
Optionally, determining a coaxial downshift strategy for the dual clutch transmission based on the power state and the clutch temperature includes: in response to the power state being a driving state, determining the on-axis downshift strategy as a power downshift strategy when the clutch temperature is less than or equal to a first temperature threshold; determining the on-axis downshift strategy as a fast-speed power downshift strategy when the clutch temperature is greater than the first temperature threshold and less than the second temperature threshold in response to the power state being the driven state; determining that the on-line downshift strategy is a power-off downshift strategy when the clutch temperature is greater than or equal to a second temperature threshold in response to the power state being the drive state, wherein the first temperature threshold is less than the second temperature threshold; in response to the power state being a non-driving state, the on-axis downshift strategy is determined to be a power-interrupt downshift strategy.
Optionally, the downshift schedule of the fast power downshift strategy includes a first adjustment period, the first adjustment period lasting a first preset duration, the generating control information based on the on-axis downshift strategy includes: under the condition that the coaxial downshift strategy is a fast power downshift strategy, acquiring the rotation speed of an engine, and acquiring a first rotation speed, a sliding friction difference, a first oil filling time and a preset oil filling time, wherein the first rotation speed is the clutch rotation speed corresponding to a transition gear of the dual clutch transmission, the first oil filling time is the clutch oil filling time corresponding to the transition gear, and the preset oil filling time is smaller than a first preset duration; and generating first control information based on the preset oil filling time in response to the engine speed being greater than the sum of the first speed and the sliding friction difference and the first oil filling time being greater than the preset oil filling time, wherein the first control information is used for determining that the preset oil filling time is a first preset duration.
Optionally, the downshift timing of the fast power downshift strategy includes a rotational speed torque adjustment period, the rotational speed torque adjustment period lasting a second preset duration, the rotational speed torque adjustment period being located after the first rotational speed adjustment period, generating control information based on the coaxial downshift strategy, further including: under the condition that the coaxial downshift strategy is a fast power downshift strategy, acquiring a first temperature, wherein the first temperature is a clutch temperature of the dual clutch transmission in a preset time period of entering a rotating speed torque adjustment period; acquiring a first torque, wherein the first torque is clutch torque corresponding to a high gear of a dual clutch transmission; determining a first temperature coefficient based on the first temperature; determining a first torque exchange time based on the first torque; determining a first adjustment period based on the first temperature coefficient and the first torque exchange time; and generating second control information based on the first adjustment time length, wherein the second control information is used for determining that the first adjustment time length is a second preset time length.
Optionally, the downshift timing of the fast power downshift strategy includes a second speed adjustment period, the second speed adjustment period lasting a third preset duration, the second speed adjustment period being located after the speed torque adjustment period, the control information being generated based on the on-axis downshift strategy, further including: under the condition that the coaxial downshift strategy is a fast power downshift strategy, acquiring the rotation speed of an engine, and acquiring a second rotation speed, a sliding friction difference, a second oil filling time and a preset oil filling time, wherein the second rotation speed is the clutch rotation speed corresponding to a target gear of the dual clutch transmission, the second oil filling time is the clutch oil filling time corresponding to the target gear, and the preset oil filling time is smaller than a third preset duration; and generating third control information based on the preset oil filling time in response to the engine speed being greater than the sum of the second speed and the sliding friction difference and the second oil filling time being greater than the preset oil filling time, wherein the third control information is used for determining that the preset oil filling time is a third preset duration.
Optionally, the downshift schedule of the fast power downshift strategy includes a torque exchange period, the torque exchange period lasting a fourth preset duration, the torque exchange period being located after the second rotational speed adjustment period, the control information being generated based on the on-axis downshift strategy, further including: under the condition that the coaxial downshift strategy is a fast power downshift strategy, acquiring a second temperature, wherein the second temperature is a clutch temperature of the dual clutch transmission in a preset time period of a torque exchange period; acquiring a second torque, wherein the second torque is clutch torque corresponding to a transition gear; calculating a second temperature coefficient based on the second temperature; calculating a second torque exchange time according to the second torque; determining a second adjustment period based on a second temperature coefficient and a second torque exchange time; and generating fourth control information based on the second adjustment time length, wherein the fourth control information is used for determining that the second adjustment time length is a fourth preset time length.
Optionally, the downshift schedule of the power-interrupt downshift strategy includes a third speed adjustment period, generates control information based on the on-axis downshift strategy, and further includes: acquiring a first pressure value, a second pressure value and a third pressure value, wherein the first pressure value is a half-junction point spring pressure value, the second pressure value is a preset hysteresis pressure value, and the third pressure value is a clutch pressure value; calculating the absolute value of the difference value between the first pressure value and the second pressure value as an off-shift pressure value; and generating fifth control information in response to the third pressure value being equal to the off-shift pressure value, wherein the fifth control information is used for controlling the engine to execute off-shift actions.
Optionally, after generating the fifth control information, generating the control information based on the on-axis downshift strategy, further includes: acquiring a second rotating speed and a slip friction difference, wherein the second rotating speed is the clutch rotating speed corresponding to the target gear of the double-clutch transmission; calculating the sum of the second rotating speed and the sliding friction difference as a target rotating speed; collecting the rotation speed of an engine; and generating sixth control information in response to the engine speed being equal to the target speed, the sixth control information being used to control the engine to end the oil charging process of the third speed adjustment period.
According to another aspect of the embodiment of the present invention, there is also provided a control device for coaxial downshift of a dual clutch transmission, including: the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a power state and a clutch temperature before a vehicle downshifts, wherein the power state comprises a driving state and a non-driving state, and the clutch temperature is the maximum value of an odd clutch temperature and an even clutch temperature of a dual clutch transmission; a determination module for determining a coaxial downshift strategy for the dual clutch transmission based on the power state and the clutch temperature, wherein the coaxial downshift strategy includes at least one of: a power downshift strategy, a fast power downshift strategy, and a power-off downshift strategy; the generation module is used for generating control information based on the coaxial downshift strategy, wherein the control information is used for adjusting the downshift sequence of the dual clutch transmission.
According to still another aspect of the embodiment of the present invention, there is further provided an electronic device including a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the control method for coaxial downshift of a dual clutch transmission according to the above-mentioned computer program.
In the embodiment of the invention, a mode of acquiring the power state and the clutch temperature before the vehicle is downshifted is adopted, the coaxial downshift strategy of the dual-clutch transmission is determined through the power state and the clutch temperature, and control information is generated based on the coaxial downshift strategy and used for adjusting the downshift time sequence of the dual-clutch transmission, so that the purpose of determining the downshift strategy in combination with the power state and the clutch temperature before the downshift is achieved, the technical effects of using different downshift strategies for different power states and different clutch temperature states are realized, the downshift time in the downshift process is effectively shortened, the heating value in the downshift process is reduced, and the technical problem of overhigh temperature of the dual-clutch transmission in the vehicle downshift is further solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a block diagram of the hardware architecture of a computer terminal for a method of controlling a dual clutch transmission on-axis downshift according to an alternate embodiment of the present invention;
FIG. 2 is a flow chart of a method of controlling a dual clutch transmission on-axis downshift according to an alternative embodiment of the present invention;
FIG. 3 is a control flow chart of a method of controlling a dual clutch transmission on-axis downshift according to an alternative embodiment of the present invention;
FIG. 4 is a flow chart of a method of controlling a dual clutch transmission on-axis downshift according to an alternative embodiment of the present invention;
FIG. 5 is a phase diagram of a power downshift strategy according to an alternative embodiment of the present invention;
FIG. 6 is a phase diagram of a power-on, power-off downshift strategy according to an alternative embodiment of the present invention;
FIG. 7 is a phase diagram of a power-on, power-off downshift strategy according to an alternative embodiment of the present invention;
fig. 8 is a block diagram of a control apparatus for a dual clutch transmission coaxial downshift according to an alternative embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise 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.
According to one embodiment of the present invention, there is provided an embodiment of a method of controlling a dual clutch transmission on-axis downshift, it being noted that the steps shown in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that although a logical sequence is shown in the flowchart, in some cases the steps shown or described may be performed in a different order than that shown.
The method embodiments may be performed in an electronic device or similar computing device in a vehicle that includes a memory and a processor. Taking an example of operation on an electronic device of a vehicle, as shown in fig. 1, the electronic device of the vehicle may include one or more processors 102 (the processors may include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processor (GPU), a Digital Signal Processing (DSP) chip, a Microprocessor (MCU), a programmable logic device (FPGA), a neural Network Processor (NPU), a Tensor Processor (TPU), an Artificial Intelligence (AI) type processor, etc., and a memory 104 for storing data. Optionally, the electronic apparatus of the automobile may further include a transmission device 106, an input/output device 108, and a display device 110 for communication functions. It will be appreciated by those skilled in the art that the configuration shown in fig. 1 is merely illustrative and is not intended to limit the configuration of the electronic device of the vehicle described above. For example, the electronic device of the vehicle may also include more or fewer components than the above structural description, or have a different configuration than the above structural description.
The memory 104 may be used to store a computer program, for example, a software program of an application software and a module, such as a computer program corresponding to a control method of a dual clutch transmission coaxial downshift in an embodiment of the present invention, and the processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, implements the control method of a dual clutch transmission coaxial downshift described above. Memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory remotely located relative to the processor 102, which may be connected to the mobile terminal via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The transmission means 106 is arranged to receive or transmit data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, simply referred to as NIC) that can connect to other network devices through a base station to communicate with the internet. In one example, the transmission device may be a Radio Frequency (RF) module, which is used to communicate with the internet wirelessly.
The display device 110 may be, for example, a touch screen type Liquid Crystal Display (LCD) and a touch display (also referred to as a "touch screen" or "touch display"). The liquid crystal display may enable a user to interact with a user interface of the mobile terminal. In some embodiments, the mobile terminal has a Graphical User Interface (GUI), and the user may interact with the GUI by touching finger contacts and/or gestures on the touch-sensitive surface, where the man-machine interaction functions optionally include the following interactions: executable instructions for performing the above-described human-machine interaction functions, such as creating web pages, drawing, word processing, making electronic documents, games, video conferencing, instant messaging, sending and receiving electronic mail, talking interfaces, playing digital video, playing digital music, and/or web browsing, are configured/stored in one or more processor-executable computer program products or readable storage media.
One of the methods for solving the problem of overheating the power-downshift clutch includes: disabling the on-axis power downshift when the clutch surface temperature does not exceed the first limit; the shift schedule is expedited when the clutch surface temperature exceeds a second limit. Wherein the first limit is less than the second limit. According to the technical scheme, the engine speed is not matched with the gear shifting process in the speed adjusting process, so that the engine is in a slip friction state with a large speed difference for a long time, the heating value is increased, the problem that the gear shifting noise is caused by overlarge gear shifting force and the like is solved, the continuous rising of the surface temperature of a clutch cannot be completely avoided, and finally the driving is limited.
Another method of addressing the overheating of a power-downshift clutch includes: after the coaxial downshift, the power interruption mode is directly adopted, so that the gear shifting process is quickened. The scheme can cause poor power-down driving feeling in the acceleration process, the phenomenon of power interruption can occur to the vehicle, the acceleration performance of the whole vehicle before and after the throttle is stepped on is opposite to the expected performance of the driver, and the driver is confused. Therefore, how to solve the problem of overheating of the surface of the coaxial power downshift clutch without intervening the intention of the driver and simultaneously give consideration to the drivability of the whole vehicle becomes a difficult problem to be solved.
A shift coordination control method of a double clutch automatic transmission is disclosed in the prior art (CN 105840808A), in which a shift sequence includes: an idle stage, a clutch oil filling preparation stage, a torque exchange stage, a rotating speed adjusting stage and a rotating speed and torque simultaneous control stage.
In this embodiment, a control method for a dual clutch transmission coaxial downshift of an electronic device operating in the vehicle is provided, and fig. 2 is a flowchart of a control method for a dual clutch transmission coaxial downshift according to one embodiment of the present invention, as shown in fig. 2, and the flowchart includes the following steps:
step S10, acquiring a power state and a clutch temperature before a vehicle downshifts, wherein the power state comprises a driving state and a non-driving state, and the clutch temperature is the maximum value of an odd clutch temperature and an even clutch temperature of the dual clutch transmission;
wherein the driving state includes an acceleration state and the non-driving state includes a constant-speed coasting state. Note that the non-drive state does not represent that the vehicle is stationary at the current position, and the power state before the downshift may be the vehicle-driving state in the period immediately before the downshift. The clutch temperature is the clutch surface temperature for the first cycle of the initiation of the on-axis downshift, which is typically a preset period of time (10 ms). When the calculated target gear of the vehicle is inconsistent with the current gear, the time when the controller sends out the coaxial downshift instruction is the time when the coaxial downshift is started.
The power state is calculated by the power state determination module based on the engine torque. In another embodiment, the method of determining the power state is as follows: first, if one of the following conditions is satisfied when the engine is in a non-driving state, it is determined that the engine is in a driving state: if the engine torque is greater than the drive torque threshold; and (II) if the engine torque is greater than the difference between the coasting torque threshold and the coasting torque hysteresis threshold, and the accelerator is greater than the opening threshold of one coasting variable drive. Second, if one of the following conditions is satisfied when the engine is in a driven state, it is determined that the engine is in a non-driven state: if the engine torque is less than or equal to the coasting torque threshold, and the engine is not in an overspeed protection state; and (II) if the engine torque is smaller than the driving torque threshold value and the accelerator is smaller than an opening threshold value for driving the vehicle to slide.
Step S20, determining a coaxial downshift strategy of the dual clutch transmission according to the power state and the clutch temperature, wherein the coaxial downshift strategy comprises at least one of the following: a power downshift strategy, a fast power downshift strategy, and a power-off downshift strategy;
step S30, generating control information based on a coaxial downshift strategy, wherein the control information is used for adjusting the downshift sequence of the dual clutch transmission;
Through the steps, the mode of acquiring the power state and the clutch temperature before the vehicle is shifted down is adopted, the coaxial shift-down strategy of the double-clutch transmission is determined through the power state and the clutch temperature, and control information is generated based on the coaxial shift-down strategy and used for adjusting shift-down time sequence of the double-clutch transmission, so that the purpose of determining the shift-down strategy in combination with the power state and the clutch temperature before the shift-down is achieved, the technical effects of using different shift-down strategies for different power states and different clutch temperature states are achieved, the shift-down time in the shift-down process is effectively shortened, the heating value in the shift-down process is reduced, and the technical problem of overhigh temperature of the double-clutch transmission in the shift-down process of the vehicle is solved. The downshift schedule includes the duration and progress of each phase of the on-axis downshift strategy.
In an alternative embodiment, the coaxial downshift strategy is determined by two factors of the power state before downshift and the clutch temperature, and the control information for adjusting the downshift sequence is generated according to the selected coaxial downshift strategy, namely, the technical scheme of the application is adopted to change the internal stage duration of each downshift strategy, so that the problem that the use of users is limited due to the fact that the coaxial downshift is prevented only by setting a temperature threshold in the prior art is effectively solved. Further, the internal stage duration of each downshift strategy is shortened, the heating value of the surface temperature of the clutch can be obviously reduced, the gear shifting speed of the vehicle is improved, the defect that the surface temperature of the clutch is too high due to the increase of the gear shifting force in the prior art is avoided, and the technical effects of rapid gear shifting and reduced heating value are achieved. Optionally, the gear shifting sequence of the power downshift strategy is idle, rotation speed adjustment, rotation speed and torque simultaneous adjustment, rotation speed adjustment, torque exchange and idle in sequence. Power is input from the transmission high range and is ultimately output from the target range through the transitional range, as shown in fig. 5 as a 7-range down 3-range shift schedule in a coaxial downshift strategy.
Optionally, the gear shifting sequence of the power interruption downshift strategy is idle, rotation speed adjusting, torque exchanging and idle in sequence. Power is input from the high range and finally output from the target range, as shown in fig. 6, which illustrates the shift schedule for a 7-gear downshift 6 in a power-interrupt downshift strategy. The shift sequence for a 7-gear downshift 5-gear in a power-interrupt downshift strategy is shown in fig. 7.
The control method of the double clutch transmission coaxial downshift before acquiring the power state and the clutch temperature before the downshift of the vehicle further comprises the following steps: the gear shifting coordination module determines a target gear (to-be-shifted gear) according to the current vehicle speed, the current gear, the opening degree of an accelerator pedal and the gear shifting rule. The vehicle speed is acquired by a vehicle speed sensor; the current gear is obtained by a gear sensor; the accelerator pedal opening is obtained by a pedal opening sensor; the gear shifting rule is a standard quantity, and different vehicle speeds and gear shifting vehicle speeds related to the opening degree of an accelerator are output according to different driving modes. Optionally, the shift schedule is a look-up table pre-stored in a memory class.
In step S20, a coaxial downshift strategy for the dual clutch transmission is determined based on the power state and clutch temperature, comprising:
step S201, determining the coaxial downshift strategy as the power downshift strategy when the clutch temperature is less than or equal to the first temperature threshold in response to the power state being the driving state;
Wherein the odd and even clutch surface temperatures are output by the system temperature model, that is, clutch surface temperature t=max { odd clutch surface temperature, even clutch surface temperature }.
The first limit value T1 (first temperature threshold) is a calibration value, and a clutch friction material temperature allowable limit value-a safety residual value 1, wherein the friction material allowable limit value is provided by a material provider, and the safety residual value 1 is a calibration value, and is generally between 100 ℃ and 120 ℃.
Step S202, determining that the coaxial downshift strategy is a fast dynamic downshift strategy when the clutch temperature is greater than a first temperature threshold and less than a second temperature threshold in response to the power state being a driving state;
step S203, determining the coaxial downshift strategy as a power interruption downshift strategy when the clutch temperature is greater than or equal to a second temperature threshold in response to the power state being the driving state, wherein the first temperature threshold is less than the second temperature threshold;
wherein the second limit value 2 (second temperature threshold value) is a standard value, and the allowable limit value of the friction difference material temperature of the clutch is generally taken to be the safety residual value 2, and the allowable limit value of the friction difference material is provided by a material supplier, wherein the safety residual value 2 is a standard value, and the temperature is generally 50-70 ℃.
In step S204, in response to the power state being the non-driving state, the on-axis downshift strategy is determined to be a power-off downshift strategy.
By adopting the technical scheme of the embodiment, the judgment is carried out according to the driving state (power state) of the vehicle before stepping on the accelerator (before entering into the downshift) and in real time by combining the clutch surface temperature. In the coaxial downshift process, when the surface temperature exceeds a first temperature threshold, reducing the heating value by accelerating the gear shifting speed; when the surface temperature exceeds the second temperature threshold, the power-off downshift is used to avoid the surface temperature from continuing to rise. According to the technical scheme, the whole vehicle drivability experience is considered, different downshift modes are selected according to the driving state before coaxial downshift is entered, the acceleration performance of the whole vehicle before and after the throttle is stepped on is guaranteed to meet the expectations of a driver, the problem of overheat of a clutch is effectively solved, the limitation of driving caused by continuous rising of the surface temperature is avoided, and meanwhile the whole vehicle drivability performance is considered.
In another alternative embodiment, determining a coaxial downshift strategy for a dual clutch transmission based on power conditions and clutch temperatures includes: in response to the power state being a driving state, determining the on-axis downshift strategy as a power downshift strategy when the clutch temperature is less than a first temperature threshold; in response to the power state being a driving state, determining that the on-axis downshift strategy is a fast power downshift strategy when the clutch temperature is greater than or equal to the first temperature threshold while less than or equal to the second temperature threshold; and determining that the on-axis downshift strategy is a power-off downshift strategy when the clutch temperature is greater than a second temperature threshold in response to the power state being the drive state, wherein the first temperature threshold is less than the second temperature threshold. That is to say that the downshift strategy determined at both the first temperature threshold and the second temperature threshold can be flexibly set.
Optionally, the downshift schedule of the fast power downshift strategy includes a first speed adjustment period, a speed torque adjustment period, a second speed adjustment period, and a torque exchange period without interval engagement.
In step S30, a downshift timing of the fast power downshift strategy includes a first rotational adjustment period, the first rotational adjustment period lasting for a first preset duration, generating control information based on the on-axis downshift strategy, including:
under the condition that the coaxial downshift strategy is a fast power downshift strategy, acquiring the rotation speed of an engine, and acquiring a first rotation speed, a sliding friction difference, a first oil filling time and a preset oil filling time, wherein the first rotation speed is the clutch rotation speed corresponding to a transition gear of the dual clutch transmission, the first oil filling time is the clutch oil filling time corresponding to the transition gear, and the preset oil filling time is smaller than a first preset duration;
and generating first control information based on the preset oil filling time in response to the engine speed being greater than the sum of the first speed and the sliding friction difference and the first oil filling time being greater than the preset oil filling time, wherein the first control information is used for determining that the preset oil filling time is a first preset duration.
In an alternative embodiment, the downshift is performed during a first rotational speed adjustment period of the fast power downshift strategy, if the engine rotational speed is greater than a sum of the clutch rotational speed (first rotational speed) and the slip friction difference corresponding to the transition gear, and the corresponding clutch oil charge time (first oil charge time) > t0 (preset oil charge time) of the transition gear directly exits the oil charge process, and then enters a subsequent rotational speed torque adjustment period, otherwise, the step is performed until the first preset duration is completed. The oil filling process is to fill oil into the driving oil cylinder of the double clutch, so that the compression degree of the double clutch is adjusted. The engine speed is acquired by an engine speed sensor; the rotating speed of the transition gear clutch is obtained by a clutch rotating speed sensor; the slip friction difference is a standard value, and the value is generally 20rpm-50 rpm; t0 is a standard value, and the value is generally between 0.08s and 0.12 s.
For example, when the first preset duration is 0.3s and the preset oil filling time is 0.1s, and when the first oil filling time is 0.2s, the engine speed is greater than the sum of the first speed and the sliding friction difference while the first oil filling time is 0.2s, the first preset duration is determined to be 0.2s, so that the purpose of shortening the first rotational speed adjustment period is achieved, and the technical effect of reducing the heating value is achieved.
In step S30, the downshift timing of the fast power downshift strategy includes a rotational speed torque adjustment period, the rotational speed torque adjustment period lasting a second preset duration, the rotational speed torque adjustment period being located after the first rotational speed adjustment period, generating control information based on the on-axis downshift strategy, further including:
under the condition that the coaxial downshift strategy is a fast power downshift strategy, acquiring a first temperature, wherein the first temperature is a clutch temperature of the dual clutch transmission in a preset time period of entering a rotating speed torque adjustment period; acquiring a first torque, wherein the first torque is clutch torque corresponding to a high gear of a dual clutch transmission; determining a first temperature coefficient based on the first temperature; determining a first torque exchange time based on the first torque; determining a first adjustment period based on the first temperature coefficient and the first torque exchange time;
Optionally, the product of the first temperature coefficient and the first torque exchange time is calculated as the first adjustment period.
And generating second control information based on the first adjustment time length, wherein the second control information is used for determining that the first adjustment time length is a second preset time length.
In an alternative embodiment, the downshift is during a speed-torque adjustment period of the fast power downshift strategy, and the system determines the execution time of the speed-torque adjustment period based on the clutch surface temperature value and the high clutch torque for a predetermined period of time to enter that period, the speed-torque adjustment time (first adjustment period) t=t1×f. If the actual adjustment time length of the rotating speed torque is longer than the first adjustment time length, the rotating speed torque adjustment period is completed and the second rotating speed adjustment period is entered.
Wherein clutch surface temperature t=max { odd clutch surface temperature, even clutch surface temperature }. t1 (first torque exchange time) is a calibrated value, which is generally between 0.15s and 0.4s, in relation to the torque of the high clutch. f (first temperature coefficient) is a calibrated value, related to clutch surface temperature, f <1.
In step S30, the downshift timing of the fast power downshift strategy includes a second speed adjustment period, the second speed adjustment period lasting a third preset duration, the second speed adjustment period being located after the speed torque adjustment period, generating control information based on the on-axis downshift strategy, and further including:
Under the condition that the coaxial downshift strategy is a fast power downshift strategy, acquiring the rotation speed of an engine, and acquiring a second rotation speed, a sliding friction difference, a second oil filling time and a preset oil filling time, wherein the second rotation speed is the clutch rotation speed corresponding to a target gear of the dual clutch transmission, the second oil filling time is the clutch oil filling time corresponding to the target gear, and the preset oil filling time is smaller than a third preset duration;
and generating third control information based on the preset oil filling time in response to the engine speed being greater than the sum of the second speed and the sliding friction difference and the second oil filling time being greater than the preset oil filling time, wherein the third control information is used for determining that the preset oil filling time is a third preset duration.
In an alternative embodiment, the downshift is during a second speed adjustment period of the fast power downshift strategy, when the high clutch pressure is half-engagement point pressure, the upshift is performed directly and the target gear is pre-engaged. That is, the shift-off action is performed while the preset engagement pressure is still present in the high-range clutch, so that the technical effect of shortening the second rotation speed adjustment period can be achieved, and the shift-down process is not affected.
Optionally, the rotation speed condition is that the rotation speed of the engine is greater than the sum of the rotation speed (second rotation speed) of the clutch corresponding to the target gear and the slip friction difference, the transition gear corresponds to the oil filling time (first oil filling time) > t0 (preset oil filling time), the oil filling process is directly exited, a next torque exchange period is further entered, and otherwise, the period is required to be continuously executed until the original third preset duration is ended. The half-engagement point pressure is a clutch spring pressure value at the time of half-linkage. The engine speed is acquired by an engine speed sensor. The speed of the transition gear clutch is obtained by a clutch speed sensor. The slip difference is a calibrated value, typically between 20rpm and 50 rpm. t0 is a standard value, and the value is generally between 0.08s and 0.12 s.
In step S30, the downshift schedule of the fast power downshift strategy includes a torque exchange period, the torque exchange period lasting a fourth preset duration, the torque exchange period being located after the second rotational speed adjustment period, generating control information based on the on-axis downshift strategy, further including: under the condition that the coaxial downshift strategy is a fast power downshift strategy, acquiring a second temperature, wherein the second temperature is a clutch temperature of the dual clutch transmission in a preset time period of a torque exchange period; acquiring a second torque, wherein the second torque is clutch torque corresponding to a transition gear; calculating a second temperature coefficient based on the second temperature; calculating a second torque exchange time according to the second torque; determining a second adjustment period based on a second temperature coefficient and a second torque exchange time; and generating fourth control information based on the second adjustment time length, wherein the fourth control information is used for determining that the second adjustment time length is a fourth preset time length.
In an alternative embodiment, the downshift is performed during a torque exchange period of a fast power downshift strategy, and the system determines the current stage execution time based on the clutch surface temperature value and the transitional shift clutch torque for a predetermined period of time to enter that stage, and the rotational speed torque adjustment time (second adjustment period) t=t1×f. And if the actual torque exchange time is longer than the second adjustment time, completing the torque exchange period. Wherein clutch surface temperature t=max { odd clutch surface temperature, even clutch surface temperature }. t1 (second torque exchange time) is a calibrated value, which is generally between 0.15s and 0.4s, in relation to the torque of the high clutch. f (second temperature coefficient) is a calibrated value, related to clutch surface temperature, f <1.
Optionally, the downshift schedule of the power-interrupt downshift strategy includes a third speed adjustment period, generates control information based on the on-axis downshift strategy, and further includes: acquiring a first pressure value, a second pressure value and a third pressure value, wherein the first pressure value is a half-junction point spring pressure value, the second pressure value is a preset hysteresis pressure value, and the third pressure value is a clutch pressure value; calculating the absolute value of the difference value between the first pressure value and the second pressure value as an off-shift pressure value; and generating fifth control information in response to the third pressure value being equal to the off-shift pressure value, wherein the fifth control information is used for controlling the engine to execute off-shift actions.
That is, the engine performs the off-shift action when the clutch pressure value is reduced to the off-shift pressure value without waiting for the clutch pressure value to be reduced to zero, effectively shortening the duration of the third rotation speed adjustment period. The gear-picking action is to control the shifting fork to pick up the high gear and to hang the coaxial target gear. After the gear is removed, the clutch starts to be filled with oil.
Optionally, after generating the fifth control information, generating the control information based on the on-axis downshift strategy, further includes: acquiring a second rotating speed and a slip friction difference, wherein the second rotating speed is the clutch rotating speed corresponding to the target gear of the double-clutch transmission; calculating the sum of the second rotating speed and the sliding friction difference as a target rotating speed; collecting the rotation speed of an engine; and generating sixth control information in response to the engine speed being equal to the target speed, the sixth control information being used to control the engine to end the oil charging process of the third speed adjustment period.
Optionally, the engine enters a torque exchange period after the oil filling process of the third rotating speed adjustment period is finished, the target gear clutch torque is obtained, and the target gear clutch torque is increased to the target torque according to a calibrated rule, so that the coaxial power interruption downshift is realized.
In an alternative embodiment, the power-interrupt downshift strategy basically comprises the steps of: (1) a rotation speed adjustment stage: the clutch pressure in a torque transmission state is quickly reduced to a smaller value P0 (P0= Pks-Phst) when the rotational speed adjustment stage is entered, meanwhile, the gear-off action is executed, the high gear is removed, the coaxial target gear is engaged, and the oil filling process is started after the gear is engaged; the engine target rotating speed=target gear clutch rotating speed+slip friction difference in the whole speed regulating process, and the response process is automatically controlled by the engine; if the engine speed reaches the target speed, and the clutch oil filling is finished, the torque exchange stage is started. Wherein Pks is the half junction spring pressure value. Phst is a standard quantity, and is a hysteresis pressure value, and generally 0.2bar to 0.5bar is adopted. (2) a torque exchange phase: at the moment, the torque of the high gear clutch is 0, the torque of the target gear clutch is increased to the target torque according to a calibrated rule, and the coaxial power interruption downshift is completed.
FIG. 3 is a general control flow diagram of a method of controlling a dual clutch transmission on-axis downshift according to an alternative embodiment of the present invention.
FIG. 4 is a control flow diagram of a fast power downshift strategy for a dual clutch transmission in-line downshift according to an alternative embodiment of the present invention.
Fig. 8 is a block diagram of a control apparatus for a double clutch transmission coaxial downshift according to one embodiment of the present invention, as shown in fig. 8, comprising:
an obtaining module 51, configured to obtain a power state and a clutch temperature before a downshift of the vehicle, where the power state includes a driving state and a non-driving state, and the clutch temperature is a maximum value of an odd clutch temperature and an even clutch temperature of the dual clutch transmission;
a determination module 52 for determining a coaxial downshift strategy for the dual clutch transmission based on the power state and the clutch temperature, wherein the coaxial downshift strategy includes at least one of: a power downshift strategy, a fast power downshift strategy, and a power-off downshift strategy;
the generation module 53 is configured to generate control information based on the on-axis downshift strategy, the control information being used to adjust a downshift schedule of the dual clutch transmission.
Through the steps, the mode of acquiring the power state and the clutch temperature before the vehicle is shifted down is adopted, the coaxial shift-down strategy of the double-clutch transmission is determined through the power state and the clutch temperature, and control information is generated based on the coaxial shift-down strategy and used for adjusting shift-down time sequence of the double-clutch transmission, so that the purpose of determining the shift-down strategy in combination with the power state and the clutch temperature before the shift-down is achieved, the technical effects of using different shift-down strategies for different power states and different clutch temperature states are achieved, the shift-down time in the shift-down process is effectively shortened, the heating value in the shift-down process is reduced, and the technical problem of overhigh temperature of the double-clutch transmission in the shift-down process of the vehicle is solved.
It should be noted that each of the above modules may be implemented by software or hardware, and for the latter, it may be implemented by, but not limited to: the modules are all located in the same processor; alternatively, the above modules may be located in different processors in any combination.
An embodiment of the invention also provides a storage medium having a computer program stored therein, wherein the computer program is arranged to perform the steps of any of the method embodiments described above when run.
Alternatively, in the present embodiment, the above-described storage medium may be configured to store a computer program for performing the steps of:
step S1, acquiring a power state and a clutch temperature before a vehicle downshifts, wherein the power state comprises a driving state and a non-driving state, and the clutch temperature is the maximum value of an odd clutch temperature and an even clutch temperature of a dual clutch transmission;
step S2, determining a coaxial downshift strategy of the dual clutch transmission according to the power state and the clutch temperature, wherein the coaxial downshift strategy comprises at least one of the following steps: a power downshift strategy, a fast power downshift strategy, and a power-off downshift strategy;
Step S3, generating control information based on a coaxial downshift strategy, wherein the control information is used for adjusting the downshift sequence of the dual clutch transmission;
embodiments of the invention also provide a processor arranged to run a computer program to perform the steps of any of the method embodiments described above.
Alternatively, in the present embodiment, the above-described processor may be configured to execute the following steps by a computer program:
step S1, acquiring a power state and a clutch temperature before a vehicle downshifts, wherein the power state comprises a driving state and a non-driving state, and the clutch temperature is the maximum value of an odd clutch temperature and an even clutch temperature of a dual clutch transmission;
step S2, determining a coaxial downshift strategy of the dual clutch transmission according to the power state and the clutch temperature, wherein the coaxial downshift strategy comprises at least one of the following steps: a power downshift strategy, a fast power downshift strategy, and a power-off downshift strategy;
step S3, generating control information based on a coaxial downshift strategy, wherein the control information is used for adjusting the downshift sequence of the dual clutch transmission;
an embodiment of the invention also provides an electronic device comprising a memory in which a computer program is stored and a processor arranged to run the computer program to perform the steps of any of the method embodiments described above.
Alternatively, in the present embodiment, the above-described processor may be configured to execute the following steps by a computer program:
step S1, acquiring a power state and a clutch temperature before a vehicle downshifts, wherein the power state comprises a driving state and a non-driving state, and the clutch temperature is the maximum value of an odd clutch temperature and an even clutch temperature of a dual clutch transmission;
step S2, determining a coaxial downshift strategy of the dual clutch transmission according to the power state and the clutch temperature, wherein the coaxial downshift strategy comprises at least one of the following steps: a power downshift strategy, a fast power downshift strategy, and a power-off downshift strategy;
step S3, generating control information based on a coaxial downshift strategy, wherein the control information is used for adjusting the downshift sequence of the dual clutch transmission;
alternatively, specific examples in this embodiment may refer to examples described in the foregoing embodiments and optional implementations, and this embodiment is not described herein.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
In the foregoing embodiments of the present invention, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed technology content may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of units may be a logic function division, and there may be another division manner in actual implementation, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (9)
1. A control method for a coaxial downshift of a dual clutch transmission, comprising:
acquiring a power state and a clutch temperature before a vehicle downshifts, wherein the power state comprises a driving state and a non-driving state, and the clutch temperature is the maximum value of an odd clutch temperature and an even clutch temperature of the dual clutch transmission;
determining a coaxial downshift strategy for the dual clutch transmission based on the power state and the clutch temperature, wherein the coaxial downshift strategy includes at least one of: a power downshift strategy, a rapid power downshift strategy and a power interruption downshift strategy, wherein a downshift time sequence of the rapid power downshift strategy comprises a first rotating speed adjustment period, a rotating speed torque adjustment period, a second rotating speed adjustment period and a torque exchange period; the gear shifting time sequence of the power downshift strategy sequentially comprises idle, rotation speed adjustment, rotation speed and torque simultaneous adjustment, rotation speed adjustment, torque exchange and idle; the gear shifting time sequence of the power interruption gear-down strategy sequentially comprises idle, rotation speed adjustment, torque exchange and idle;
generating control information based on the on-axis downshift strategy, the control information being used to adjust the downshift schedule of the dual clutch transmission;
Determining a coaxial downshift strategy for the dual clutch transmission based on the power state and the clutch temperature, comprising:
determining the on-line downshift strategy as the power downshift strategy when the clutch temperature is less than or equal to a first temperature threshold in response to the power state being the drive state;
determining the on-line downshift strategy as the fast-speed power downshift strategy in response to the power state being the driven state with the clutch temperature being greater than the first temperature threshold and less than a second temperature threshold;
determining that the on-line downshift strategy is the power-interrupt downshift strategy when the clutch temperature is greater than or equal to the second temperature threshold in response to the power state being the driven state, wherein the first temperature threshold is less than the second temperature threshold;
in response to the power state being the non-driving state, determining the on-line downshift strategy as the power-interrupt downshift strategy.
2. The method of claim 1, wherein the first rotational speed adjustment period lasts for a first preset duration, generating control information based on the on-axis downshift strategy, comprising:
Under the condition that the coaxial downshift strategy is the rapid power downshift strategy, acquiring an engine rotating speed, and acquiring a first rotating speed, a sliding friction difference, a first oil filling time and a preset oil filling time, wherein the first rotating speed is a clutch rotating speed corresponding to a transition gear of the dual-clutch transmission, the first oil filling time is a clutch oil filling time corresponding to the transition gear, and the preset oil filling time is smaller than the first preset duration;
and generating first control information based on the preset oil filling time in response to the engine speed being greater than the sum of the first speed and the slip difference and the first oil filling time being greater than the preset oil filling time, wherein the first control information is used for determining that the preset oil filling time is the first preset duration.
3. The method of claim 2, wherein the rotational speed torque adjustment period is for a second preset duration, the rotational speed torque adjustment period being located after the first rotational speed adjustment period, generating control information based on the on-axis downshift strategy, further comprising:
acquiring a first temperature under the condition that the coaxial downshift strategy is the rapid power downshift strategy, wherein the first temperature is the clutch temperature of the dual clutch transmission in a preset time period of the rotating speed torque adjustment period;
Acquiring a first torque, wherein the first torque is clutch torque corresponding to a high gear of the dual clutch transmission;
determining a first temperature coefficient based on the first temperature;
determining a first torque exchange time based on the first torque;
determining a first adjustment duration based on the first temperature coefficient and the first torque exchange time;
generating second control information based on the first adjustment duration, wherein the second control information is used for determining that the first adjustment duration is the second preset duration.
4. The method of claim 3, wherein the second rotational speed adjustment period is for a third preset duration, the second rotational speed adjustment period being located after the rotational speed torque adjustment period, generating control information based on the on-axis downshift strategy, further comprising:
under the condition that the coaxial downshift strategy is the rapid dynamic downshift strategy, acquiring the engine rotating speed, and acquiring a second rotating speed, the sliding friction difference, a second oil filling time and the preset oil filling time, wherein the second rotating speed is the clutch rotating speed corresponding to the target gear of the dual-clutch transmission, the second oil filling time is the clutch oil filling time corresponding to the target gear, and the preset oil filling time is smaller than the third preset duration;
And generating third control information based on the preset oil filling time in response to the engine speed being greater than the sum of the second speed and the slip difference and the second oil filling time being greater than the preset oil filling time, wherein the third control information is used for determining that the preset oil filling time is the third preset duration.
5. The method of claim 4, wherein the torque exchange period continues for a fourth preset period of time, the torque exchange period being located after the second rotational speed adjustment period, generating control information based on the on-axis downshift strategy, further comprising:
acquiring a second temperature when the on-axis downshift strategy is the fast power downshift strategy, wherein the second temperature is the clutch temperature of the dual clutch transmission during the preset time period for the torque exchange period;
acquiring a second torque, wherein the second torque is clutch torque corresponding to the transition gear;
calculating a second temperature coefficient based on the second temperature;
calculating a second torque exchange time according to the second torque;
determining a second adjustment period based on the second temperature coefficient and the second torque exchange time;
And generating fourth control information based on the second adjustment time length, wherein the fourth control information is used for determining that the second adjustment time length is the fourth preset time length.
6. The method of claim 1, wherein the downshift schedule of the power-interrupt downshift strategy includes a third speed adjustment period, generating control information based on the on-line downshift strategy, further comprising:
acquiring a first pressure value, a second pressure value and a third pressure value, wherein the first pressure value is a half-junction point spring pressure value, the second pressure value is a preset hysteresis pressure value, and the third pressure value is a clutch pressure value;
calculating the absolute value of the difference value between the first pressure value and the second pressure value as an off-shift pressure value;
and generating fifth control information in response to the third pressure value being equal to the off-shift pressure value, wherein the fifth control information is used for controlling the engine to execute off-shift actions.
7. The method of claim 6, wherein generating control information based on the on-axis downshift strategy after generating fifth control information, further comprising:
acquiring a second rotating speed and a slip friction difference, wherein the second rotating speed is the clutch rotating speed corresponding to the target gear of the double-clutch transmission;
Calculating the sum of the second rotating speed and the sliding friction difference as a target rotating speed;
collecting the rotation speed of an engine;
and generating sixth control information in response to the engine speed being equal to the target speed, wherein the sixth control information is used for controlling the engine to end the oil charging process of the third speed adjustment period.
8. A control device for a coaxial downshift of a double clutch transmission, comprising:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a power state and a clutch temperature before a vehicle downshifts, the power state comprises a driving state and a non-driving state, and the clutch temperature is the maximum value of an odd clutch temperature and an even clutch temperature of a double-clutch transmission;
a determination module for determining a coaxial downshift strategy for the dual clutch transmission based on the power state and the clutch temperature, wherein the coaxial downshift strategy includes at least one of: a power downshift strategy, a rapid power downshift strategy and a power interruption downshift strategy, wherein a downshift time sequence of the rapid power downshift strategy comprises a first rotating speed adjustment period, a rotating speed torque adjustment period, a second rotating speed adjustment period and a torque exchange period; the gear shifting time sequence of the power downshift strategy sequentially comprises idle, rotation speed adjustment, rotation speed and torque simultaneous adjustment, rotation speed adjustment, torque exchange and idle; the gear shifting time sequence of the power interruption gear-down strategy sequentially comprises idle, rotation speed adjustment, torque exchange and idle;
The generation module is used for generating control information based on the coaxial downshift strategy, wherein the control information is used for adjusting the downshift sequence of the dual clutch transmission;
wherein determining a coaxial downshift strategy for the dual clutch transmission based on the power state and the clutch temperature comprises:
determining the on-line downshift strategy as the power downshift strategy when the clutch temperature is less than or equal to a first temperature threshold in response to the power state being the drive state;
determining the on-line downshift strategy as the fast-speed power downshift strategy in response to the power state being the driven state with the clutch temperature being greater than the first temperature threshold and less than a second temperature threshold;
determining that the on-line downshift strategy is the power-interrupt downshift strategy when the clutch temperature is greater than or equal to the second temperature threshold in response to the power state being the driven state, wherein the first temperature threshold is less than the second temperature threshold;
in response to the power state being the non-driving state, determining the on-line downshift strategy as the power-interrupt downshift strategy.
9. An electronic device comprising a memory and a processor, characterized in that the memory has stored therein a computer program, the processor being arranged to run the computer program to perform the method of any of the claims 1 to 7.
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