Power downshift vehicle speed calibration method and device, virtual calibration test bench and medium

Abstract

The invention discloses a power downshift vehicle speed calibration method and device, a virtual calibration test bench and a medium. The method comprises the following steps: controlling a vehicle simulation model to run to a current rotating speed and a current gear based on a virtual calibration test bed, and fixing an accelerator pedal opening degree at a current accelerator pedal opening degree; in the power downshift process of the double-clutch gearbox at the current rotating speed in the vehicle simulation model, the current gear shifting impact degree is determined according to the current gear shifting vehicle speed; according to the current gear, the current accelerator pedal opening degree, the current gear shifting vehicle speed, the current gear shifting time and the current gear shifting impact degree, current rotating speed calibration data corresponding to the current rotating speed are generated; obtaining next rotating speed calibration data and next gear rotating speed calibration data; and the current accelerator pedal opening degree is adjusted, downshift vehicle speed calibration data of different accelerator pedal opening degrees of all gears are obtained, and a downshift curve of the double-clutch gearbox is generated. The development period is shortened, a large amount of time cost and labor cost are saved, and the development cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of virtual calibration, and in particular to a power downshift vehicle speed calibration method, a device, a virtual calibration test bench and a medium. Background Art

[0002] Dual clutch transmission (DCT) is gaining more and more attention due to its advantages such as fast shifting speed and high transmission efficiency. The automatic shifting of dual clutch transmission requires accurate judgment of driving needs and reasonable use of gears, which requires calibration of shifting rules. Shift point calibration is the calibration of shifting speed, which is one of the main factors affecting shifting quality. The quality of shifting rule calibration has a great impact on the driving performance of the whole vehicle. If the shift point calibration is unreasonable, it will affect the smoothness of shifting and further affect the comfort of the vehicle. Summary of the invention

[0003] The present invention provides a power downshift vehicle speed calibration method, device, virtual calibration test bench and medium to solve the problems of long calibration test cycle and high development cost of the current actual vehicle shifting law.

[0004] According to one aspect of the present invention, a power downshift vehicle speed calibration method is provided, the power downshift vehicle speed calibration method comprising:

[0005] Based on the virtual calibration test bench, the vehicle simulation model is controlled to run to the current speed and the current gear, and the accelerator pedal opening is fixed at the current accelerator pedal opening;

[0006] In the vehicle simulation model, when the dual-clutch transmission performs a power downshift at the current speed, obtaining a current shift vehicle speed and a current shift time, and determining a current shift impact degree according to the current shift vehicle speed;

[0007] generating current speed calibration data corresponding to the current speed according to the current gear position, the current accelerator pedal opening, the current gear shift vehicle speed, the current gear shift time, and the current gear shift impact degree;

[0008] Decreasing the current speed to obtain a next speed, and performing power downshift at the next speed to obtain next speed calibration data corresponding to the next speed;

[0009] Incrementally increase the current gear to obtain a next gear, and perform power downshifting at the next gear to obtain next gear speed calibration data corresponding to the next gear;

[0010] The current accelerator pedal opening is adjusted to obtain downshift vehicle speed calibration data of different accelerator pedal openings in each gear, and a downshift curve of the dual clutch transmission is generated according to the downshift vehicle speed calibration data.

[0011] Optionally, determining the current gear shift impact degree according to the current gear shift vehicle speed includes:

[0012] A plurality of the current gear shift vehicle speeds are acquired according to a set acquisition cycle, and a current gear shift impact degree is calculated based on the plurality of the current gear shift vehicle speeds.

[0013] Optionally, after determining the current gear shift impact degree according to the current gear shift vehicle speed, the method further includes:

[0014] If the current gear shift impact degree is less than or equal to the set impact degree threshold, then continue to perform the operation of generating the current speed calibration data corresponding to the current speed;

[0015] If the current gear shift impact degree is less than the set impact degree threshold, the current gear position is incremented to obtain the next gear position.

[0016] Optionally, after obtaining the current gear shifting vehicle speed and the current gear shifting time, it also includes:

[0017] If the current gear shift time is within the set gear shift time range, then continue to perform the operation of generating the current speed calibration data corresponding to the current speed;

[0018] If the current gear shift time is not within the set gear shift time range, the current gear is incremented to obtain the next gear.

[0019] Optionally, decreasing the current rotation speed to obtain a next rotation speed includes:

[0020] The current gear-shifting vehicle speed is decremented with a set step length to obtain a next gear-shifting vehicle speed, and a next rotation speed is obtained according to the next gear-shifting vehicle speed.

[0021] Optionally, before generating the downshift curve of the dual clutch transmission according to the downshift vehicle speed calibration data, the method further includes:

[0022] Based on the current accelerator pedal opening, calibration data with a smaller current gear shift impact is selected as the downshift vehicle speed calibration data.

[0023] Optionally, the current gear position is 3rd gear, and the current gear shift time is the time for switching from 3rd gear to 2nd gear.

[0024] According to another aspect of the present invention, a power downshift vehicle speed calibration device is provided, the power downshift vehicle speed calibration device comprising:

[0025] A virtual vehicle operation module, used to execute the control of the vehicle simulation model based on the virtual calibration test bench to run to the current speed and the current gear, and fix the accelerator pedal opening at the current accelerator pedal opening;

[0026] a gear shift shock degree determination module, configured to obtain a current gear shift vehicle speed and a current gear shift time during a power downshift of a dual clutch transmission at the current speed in the vehicle simulation model, and determine a current gear shift shock degree according to the current gear shift vehicle speed;

[0027] A current speed calibration module, used for generating current speed calibration data corresponding to the current speed according to the current gear position, the current accelerator pedal opening, the current gear shift vehicle speed, the current gear shift time and the current gear shift impact degree;

[0028] A next speed calibration module, used for executing the decrement of the current speed to obtain a next speed, and performing power downshift at the next speed to obtain next speed calibration data corresponding to the next speed;

[0029] A next gear speed calibration module, used for executing the step of incrementing the current gear to obtain the next gear, and performing power downshifting at the next gear to obtain the next gear speed calibration data corresponding to the next gear;

[0030] The downshift curve generating module is used to adjust the current accelerator pedal opening, obtain downshift vehicle speed calibration data of different accelerator pedal openings of each gear, and generate a downshift curve of the dual clutch transmission according to the downshift vehicle speed calibration data.

[0031] According to another aspect of the present invention, a virtual calibration test bench is provided. The virtual calibration test bench comprises a vehicle simulation model and a power downshift vehicle speed calibration device as described in any embodiment of the present invention.

[0032] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the power downshift vehicle speed calibration method described in any embodiment of the present invention when executed.

[0033] The technical solution of the embodiment of the present invention is to control the vehicle simulation model to run to the current speed and the current gear position based on the virtual calibration test bench, and fix the accelerator pedal opening at the current accelerator pedal opening. In the process of power downshifting at the current speed in the dual-clutch transmission in the vehicle simulation model, the current gear shifting vehicle speed and the current gear shifting time are obtained, and the current gear shifting impact is determined according to the current gear shifting vehicle speed; the current speed calibration data corresponding to the current speed is generated according to the current gear position, the current accelerator pedal opening, the current gear shifting vehicle speed, the current gear shifting time and the current gear shifting impact; the current speed is decreased to obtain the next speed, and the power downshift is performed at the next speed to obtain the next speed calibration data corresponding to the next speed; the current gear position is increased to obtain the next gear position, and the power downshift is performed at the next gear to obtain the next gear speed calibration data corresponding to the next gear; the current accelerator pedal opening is adjusted to obtain the downshifting vehicle speed calibration data of different accelerator pedal openings of each gear, and the downshift curve of the dual-clutch transmission is generated according to the downshifting vehicle speed calibration data. The present invention solves the problem that the current calibration test cycle of the actual vehicle shifting law is long and the development cost is high, thereby greatly reducing the difficulty and workload of traditional calibration work, shortening the development cycle, saving a lot of time and labor costs, and reducing development costs.

[0034] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 is a flow chart of a power downshift vehicle speed calibration method provided according to an embodiment of the present invention;

[0037] Figure 2 is a schematic diagram of the principle of determining the shift time applicable to an embodiment of the present invention;

[0038] Figure 3 is a flow chart of a power downshift vehicle speed calibration method provided according to an embodiment of the present invention;

[0039] Figure 4 is a schematic diagram of a downshift curve of a dual clutch transmission provided according to an embodiment of the present invention;

[0040] Figure 5 It is a structural schematic diagram of a power downshift vehicle speed calibration device provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0042] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0043] Figure 1 A flowchart of a power downshift speed calibration method is provided for an embodiment of the present invention. This embodiment can be applied to the case of virtual calibration of power downshift speed of a dual clutch transmission based on simulation modeling. The power downshift speed calibration method can be executed by a power downshift speed calibration device. The power downshift speed calibration device can be implemented in the form of hardware and / or software. The power downshift speed calibration device can be configured in a virtual calibration test bench. Figure 1 As shown, the power downshift vehicle speed calibration method includes:

[0044] S110, based on the virtual calibration test bench, controlling the vehicle simulation model to run to the current speed and the current gear, and fixing the accelerator pedal opening at the current accelerator pedal opening.

[0045] Among them, the virtual calibration test bench builds a dual-clutch transmission through the I / O interface of the dSPACE simulation system. In this embodiment, the power downshift vehicle speed is virtually calibrated through the virtual calibration test bench. The virtual calibration test bench includes three simulation modes, namely model in the loop simulation (Model in the Loop, MIL), software in the loop simulation (Software in the Loop, SIL) and hardware in the loop simulation (Hardware in the Loop, HIL). The virtual calibration test bench of this embodiment is implemented by hardware-in-the-loop simulation.

[0046] The vehicle simulation model is used to simulate the operation of the dual-clutch transmission to achieve closed-loop control of the dual-clutch transmission. In addition, the simulation process of the vehicle simulation model can be controlled and observed in real time, the visual management of the power downshift speed calibration can be achieved, and various operating parameters can be collected.

[0047] The current speed, current gear position and current accelerator pedal opening are all quantities involved in performing virtual calibration of the power downshift vehicle speed of the dual-clutch transmission based on the virtual calibration test bench, that is, the current speed is the speed corresponding to each gear position, and the current gear position can be any gear from 2nd gear to 7th gear. The current speed is the speed corresponding to when the current gear position is 2nd gear to 7th gear respectively. In this embodiment, the gear positions are selected in sequence as the current gear position.

[0048] The current accelerator pedal opening can be selected in sequence as 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 95% for calibration.

[0049] S120. In the vehicle simulation model, when the dual-clutch transmission performs a power downshift at the current speed, obtain a current gear shifting speed and a current gear shifting time, and determine a current gear shifting impact degree according to the current gear shifting speed.

[0050] The main evaluation index of the speed of the gear shift process is the gear shift time. The current gear shift time in this embodiment refers to the time required for the entire process from the start of the gear shift to the end of the gear shift process. Figure 2 As shown, the current shift time refers to the time interval from the start time t1 of the shift to the complete end time t4 of the shift process. For example, taking the current gear position as the 3rd gear as an example, the current shift time is the time to switch from the 3rd gear to the 2nd gear. Similarly, taking the current gear position as the 4th gear as an example, the current shift time is the time to switch from the 4th gear to the 3rd gear, and so on. This embodiment will not be repeated here.

[0051] The shifting process of the dual-clutch transmission requires that the shifting time should be shortened as much as possible. In the vehicle simulation model, when the dual-clutch transmission performs power downshifting at the current speed, it is determined whether the shifting time is within the set shifting time range. Optionally, the set shifting time range can be set to 0.5s-0.8s.

[0052] Specifically, if the current shift time is within the set shift time range, that is, the current shift time at this time can meet the dual-clutch transmission shift process requirements, then continue to execute the operation of generating the current speed calibration data corresponding to the current speed; if the current shift time is not within the set shift time range, that is, the current shift time at this time cannot meet the dual-clutch transmission shift process requirements, then increase the current gear to obtain the next gear.

[0053] It can be seen that the impact degree is generally used to measure the smoothness of gear shifting. In the vehicle simulation model, when the dual-clutch transmission performs power downshifting at the current speed, multiple current gear shifting vehicle speeds are obtained according to the set acquisition cycle, and the current gear shift impact degree is calculated based on the multiple current gear shifting vehicle speeds, which is specifically:

[0054]

[0055] Wherein, j is the current gear shift impact degree; T is the set sampling period, which is optional and is set to 10ms; v0, v1, and v2 are three consecutive sampling values ​​of the current gear shift vehicle speed, respectively.

[0056] Furthermore, it is determined whether the current gear shift shock degree meets the requirements. If the current gear shift shock degree is less than or equal to the set shock degree threshold, the operation of generating the current speed calibration data corresponding to the current speed is continued; if the current gear shift shock degree is less than the set shock degree threshold, the current gear is incremented to obtain the next gear.

[0057] The impact threshold can be set according to the restrictions of different countries and regions. Optionally, the impact threshold can be set to 10m / s 3 .

[0058] S130, generating current speed calibration data corresponding to the current speed according to the current gear position, the current accelerator pedal opening, the current gear shifting vehicle speed, the current gear shifting time and the current gear shifting impact degree.

[0059] S140, decreasing the current speed to obtain a next speed, and performing power downshift at the next speed to obtain next speed calibration data corresponding to the next speed.

[0060] The next gear shifting speed is obtained by decreasing the current gear shifting speed by a set step length, and the next speed is obtained according to the next gear shifting speed, that is, the next speed is the speed corresponding to the next gear shifting speed relative to the current speed.

[0061] Set the step size to the decrement speed selected by the vehicle speed, optionally, set the step size to 0.5km / h.

[0062] For example, taking the power downshift process of the dual clutch transmission switching from 3rd gear to 2nd gear as an example, the current speed is the speed of 3rd gear, and the next speed is the speed corresponding to 2nd gear after downshifting, and so on.

[0063] Specifically, after executing steps S110 to S130 at the current vehicle speed, the current speed calibration data corresponding to the current speed is obtained, the current vehicle speed is reduced to obtain the next vehicle speed, and after repeating steps S110 to S130 at the next vehicle speed, the next speed calibration data corresponding to the next speed is obtained, and so on, to complete the speed calibration data of all selected power downshift speeds.

[0064] S150, incrementing the current gear to obtain a next gear, and performing a power downshift at the next gear to obtain next gear speed calibration data corresponding to the next gear.

[0065] Among them, if the current gear is 2nd gear, the next gear is 3rd gear, if the current gear is 3rd gear, the next gear is 4th gear, and so on, until the power downshift vehicle speed data calibration is completed when the current gear is 7th gear.

[0066] Specifically, if the current gear position is the 2nd gear, after executing steps S110 to S140, the speed calibration data corresponding to the current gear position of the 2nd gear can be obtained. Similarly, if the current gear position is the 3rd gear, after executing steps S110 to S140, the speed calibration data corresponding to the current gear position of the 3rd gear can be obtained, and so on, until the speed calibration data corresponding to the current gear position of the 7th gear is completed.

[0067] S160: Adjust the current accelerator pedal opening to obtain downshift vehicle speed calibration data for different accelerator pedal openings for each gear, and generate a downshift curve for the dual clutch transmission according to the downshift vehicle speed calibration data.

[0068] On the basis of the above, based on the current accelerator pedal opening, the calibration data with a smaller current gear shift impact is selected as the downshift vehicle speed calibration data.

[0069] Furthermore, different throttle pedal openings are selected to obtain downshift vehicle speed calibration data for different throttle pedal openings for each gear, that is, after executing steps S110 to S150, the downshift vehicle speed calibration data for the current throttle pedal opening can be obtained, and the current throttle pedal opening is further adjusted to the next throttle pedal opening. After repeating steps S110 to S150, the downshift vehicle speed calibration data for the next throttle pedal opening can be obtained, and so on, until the downshift vehicle speed calibration data for different throttle pedal openings for all gears is completed.

[0070] For example, if the current throttle pedal opening is selected to be 30%, then after executing steps S110 to S150, the downshift vehicle speed calibration data for the current throttle pedal opening of 30% can be obtained; if the next throttle pedal opening is selected to be 40%, then after executing steps S110 to S150, the downshift vehicle speed calibration data for the next throttle pedal opening of 40% can be obtained; and so on, the downshift vehicle speed calibration data corresponding to all selected throttle pedal openings can be obtained.

[0071] The shifting rule calibration is required for the automatic shifting of dual clutch transmission. The shifting curve is the most important calibration content in the shifting strategy control, which determines the driving performance and comfort. Based on the above, the downshifting speed calibration data of different accelerator pedal openings in each gear can be obtained with the downshifting speed as the horizontal coordinate and the accelerator pedal opening as the vertical coordinate.

[0072] Based on the same inventive concept, Figure 3 This is a flow chart of a power downshift vehicle speed calibration method provided by an embodiment of the present invention. Based on the above embodiment, this embodiment takes the power downshift process of a dual clutch transmission switching from 3rd gear to 2nd gear as an example to provide an optional implementation method. Figure 3 As shown, the power downshift vehicle speed calibration method includes:

[0073] S210: Based on the virtual calibration test bench, control the vehicle simulation model to run to the current speed and the current gear, and fix the accelerator pedal opening at the current accelerator pedal opening.

[0074] Specifically, the vehicle simulation model is controlled to run to the current gear position 3rd gear, the accelerator pedal opening is fixed at 30% of the current accelerator pedal opening, and a power downshift is performed at the current speed.

[0075] S211. In the vehicle simulation model, when the dual-clutch transmission performs a power downshift at the current speed, obtain a current gear shifting speed and a current gear shifting time, and determine a current gear shifting impact degree according to the current gear shifting speed.

[0076] S212: Determine whether the current gear shift impact degree is less than or equal to a set impact degree threshold value. If so, execute step S213; if not, execute step S215.

[0077] S213, determining whether the current gear shift time is within the set gear shift time range, if so, executing step S214, if not, executing step S215.

[0078] S214, generating current speed calibration data corresponding to the current speed according to the current gear position, the current accelerator pedal opening, the current gear shifting vehicle speed, the current gear shifting time and the current gear shifting impact degree.

[0079] S215, decreasing the current speed to obtain the next speed, and performing power downshift at the next speed to obtain the next speed calibration data corresponding to the next speed, and returning to step S210.

[0080] S216, increment the current gear to obtain the next gear, and perform power downshifting in the next gear to obtain the next gear speed calibration data corresponding to the next gear, and return to step S210.

[0081] S217: adjusting the current accelerator pedal opening to obtain downshift vehicle speed calibration data for different accelerator pedal openings for each gear, and generating a downshift curve for the dual clutch transmission according to the downshift vehicle speed calibration data.

[0082] It should be noted that the downshift curve of the dual clutch transmission is based on the upshift curve, and the downshift curve and the upshift curve maintain a certain vehicle speed interval. In order to ensure that the vehicle does not shift gears cyclically, the selection of the downshift point of the downshift curve should meet the condition that the throttle opening remains unchanged. Therefore, before step S216, the current throttle pedal opening is fixed.

[0083] For example, see Figure 4 As shown in the figure, the downshift curve of the dual clutch transmission is generated according to the downshift vehicle speed calibration data. The horizontal axis is the vehicle speed and the vertical axis is the accelerator pedal opening. The corresponding vehicle speed is calculated during the power downshift process after the accelerator pedal opening is fixed. In addition, continue to refer to Figure 4 As shown, in this embodiment, taking into account the running performance of the vehicle, it is preferred that the vehicle runs in the comprehensive area, and the current accelerator pedal opening is calibrated to 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 95% of the accelerator pedal opening in sequence.

[0084] The technical solution of the embodiment of the present invention uses a virtual calibration test bench to control a vehicle simulation model based on a simulation modeling method to virtually calibrate the power downshift speed of a dual-clutch transmission. The provided calibration method optimizes the power downshift speed value based on the gear shift shock degree, reduces the shock degree, improves the gear shift quality, and improves the ride comfort. It also greatly reduces the difficulty and workload of traditional calibration work, shortens the development cycle, saves a lot of time and labor costs, and reduces development costs.

[0085] Based on the same inventive concept, Figure 5 The schematic diagram of the structure of a power downshift vehicle speed calibration device provided by an embodiment of the present invention. Figure 5 As shown, the power downshift vehicle speed calibration device comprises:

[0086] A virtual vehicle operation module 310 is used to execute the control of the vehicle simulation model to run to the current speed and the current gear based on the virtual calibration test bench, and fix the accelerator pedal opening at the current accelerator pedal opening;

[0087] The gear shift shock degree determination module 320 is used to obtain the current gear shift vehicle speed and the current gear shift time during the power downshift process of the dual clutch transmission at the current speed in the vehicle simulation model, and determine the current gear shift shock degree according to the current gear shift vehicle speed;

[0088] The current speed calibration module 330 is used to generate current speed calibration data corresponding to the current speed according to the current gear position, the current accelerator pedal opening, the current gear shifting vehicle speed, the current gear shifting time and the current gear shifting impact degree;

[0089] The next speed calibration module 340 is used to execute the decrement of the current speed to obtain the next speed, and to perform power downshift at the next speed to obtain the next speed calibration data corresponding to the next speed;

[0090] The next gear speed calibration module 350 is used to execute the stepwise increase of the current gear to obtain the next gear, and to perform power downshift at the next gear to obtain the next gear speed calibration data corresponding to the next gear;

[0091] The downshift curve generating module 360 ​​is used to adjust the current accelerator pedal opening, obtain downshift vehicle speed calibration data for different accelerator pedal openings of each gear, and generate a downshift curve of the dual clutch transmission according to the downshift vehicle speed calibration data.

[0092] Optionally, the current gear shift impact degree is determined according to the current gear shift vehicle speed, specifically for:

[0093] A plurality of current gear shift vehicle speeds are acquired according to a set acquisition cycle, and a current gear shift impact degree is calculated based on the plurality of current gear shift vehicle speeds.

[0094] Optionally, the power downshift vehicle speed calibration device further includes:

[0095] A gear shift impact judgment module, used to execute the operation of continuing to generate current speed calibration data corresponding to the current speed if the current gear shift impact is less than or equal to a set impact threshold;

[0096] If the current gear shift impact degree is less than the set impact degree threshold, the current gear is incremented to obtain the next gear.

[0097] Optionally, the power downshift vehicle speed calibration device further includes:

[0098] A shift time judgment module, used to execute the operation of continuing to generate current speed calibration data corresponding to the current speed if the current shift time is within the set shift time range;

[0099] If the current gear shift time is not within the set gear shift time range, the current gear is incremented to obtain the next gear.

[0100] Optionally, the current speed is reduced to obtain the next speed, which is specifically used for:

[0101] The current gear-shifting vehicle speed is decremented by a set step length to obtain the next gear-shifting vehicle speed, and the next rotation speed is obtained according to the next gear-shifting vehicle speed.

[0102] Optionally, the power downshift vehicle speed calibration device further includes:

[0103] The downshift vehicle speed calibration data determination module is used to select the calibration data with smaller current gear shift impact as the downshift vehicle speed calibration data based on the current accelerator pedal opening.

[0104] Optionally, if the current gear position is 3rd gear, the current gear shift time is the time to switch from 3rd gear to 2nd gear.

[0105] The power downshift vehicle speed calibration device provided in the embodiment of the present invention can execute the power downshift vehicle speed calibration method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects for executing the power downshift vehicle speed calibration method.

[0106] Based on the same inventive concept, the virtual calibration test bench includes a vehicle simulation model and a power downshift vehicle speed calibration device as in the embodiment of the present invention. The vehicle simulation model is used to simulate the operation of a dual-clutch transmission to control the dual-clutch transmission in a closed loop. The vehicle simulation model implements virtual calibration of the power downshift vehicle speed based on the calibration test software. In the calibration test software, the test sequence is written according to the preset conditions and operation steps of the downshift vehicle speed calibration test case, and the real-time control of the vehicle simulation model is realized together with the ControlDesk control platform, and the test action execution is simulated. At the same time, CANape is called to collect TCU data, and the test script is written to obtain the required downshift vehicle speed calibration data. At the same time, a downshift vehicle speed calibration test sequence is built in the calibration test software, and a parameterized design is performed. The test parameters of the specific downshift vehicle speed calibration test case are imported through Excel, and the test script is called through Excel to automatically execute the downshift vehicle speed calibration test case.

[0107] In some embodiments, the power downshift vehicle speed calibration method can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium. Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include: being implemented in one or more computer programs, which can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a dedicated or general-purpose programmable processor, which can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0108] Computer programs 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, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0109] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, 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 portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0110] To provide interaction with a user, the systems and techniques described herein may be implemented on a virtual calibration test bench 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), through which a user may provide input to the virtual calibration test bench. Other types of devices may also be used to provide interaction with a user; for example, the feedback provided to the user may 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 input, voice input, or tactile input).

[0111] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0112] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0113] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0114] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A power downshift vehicle speed calibration method, characterized in that: include: Based on the virtual calibration test bench, the vehicle simulation model is controlled to run to the current speed and the current gear, and the accelerator pedal opening is fixed at the current accelerator pedal opening; In the vehicle simulation model, when the dual-clutch transmission performs a power downshift at the current speed, obtaining a current shift vehicle speed and a current shift time, and determining a current shift impact degree according to the current shift vehicle speed; generating current speed calibration data corresponding to the current speed according to the current gear position, the current accelerator pedal opening, the current gear shift vehicle speed, the current gear shift time, and the current gear shift impact degree; Decreasing the current speed to obtain a next speed, and performing power downshift at the next speed to obtain next speed calibration data corresponding to the next speed; Incrementally increase the current gear to obtain a next gear, and perform power downshifting at the next gear to obtain next gear speed calibration data corresponding to the next gear; The current accelerator pedal opening is adjusted to obtain downshift vehicle speed calibration data of different accelerator pedal openings in each gear, and a downshift curve of the dual clutch transmission is generated according to the downshift vehicle speed calibration data.

2. The power downshift vehicle speed calibration method according to claim 1, characterized in that: Determining a current gear shift impact degree according to the current gear shift vehicle speed includes: A plurality of the current gear shift vehicle speeds are acquired according to a set acquisition cycle, and a current gear shift impact degree is calculated based on the plurality of the current gear shift vehicle speeds.

3. The power downshift vehicle speed calibration method according to claim 1, characterized in that: After determining the current gear shift impact degree according to the current gear shift vehicle speed, the method further includes: If the current gear shift impact degree is less than or equal to the set impact degree threshold, then continue to perform the operation of generating the current speed calibration data corresponding to the current speed; If the current gear shift impact degree is less than the set impact degree threshold, the current gear position is incremented to obtain the next gear position.

4. The power downshift vehicle speed calibration method according to claim 1, characterized in that: After obtaining the current gear shifting speed and the current gear shifting time, it also includes: If the current gear shift time is within the set gear shift time range, then continue to perform the operation of generating the current speed calibration data corresponding to the current speed; If the current gear shift time is not within the set gear shift time range, the current gear is incremented to obtain the next gear.

5. The power downshift vehicle speed calibration method according to claim 1, characterized in that: Decreasing the current speed to obtain a next speed includes: The current gear-shifting vehicle speed is decremented with a set step length to obtain a next gear-shifting vehicle speed, and a next rotation speed is obtained according to the next gear-shifting vehicle speed.

6. The power downshift vehicle speed calibration method according to claim 1, characterized in that: Before generating the downshift curve of the dual clutch transmission according to the downshift vehicle speed calibration data, the method further includes: Based on the current accelerator pedal opening, calibration data with a smaller current gear shift impact is selected as the downshift vehicle speed calibration data.

7. The power downshift vehicle speed calibration method according to claim 1, characterized in that: The current gear position is the 3rd gear, and the current gear shift time is the time for switching from the 3rd gear to the 2nd gear.

8. A power downshift vehicle speed calibration device, characterized in that: include: A virtual vehicle operation module, used to execute the control of the vehicle simulation model based on the virtual calibration test bench to run to the current speed and the current gear, and fix the accelerator pedal opening at the current accelerator pedal opening; a gear shift shock degree determination module, configured to obtain a current gear shift vehicle speed and a current gear shift time during a power downshift of a dual clutch transmission at the current speed in the vehicle simulation model, and determine a current gear shift shock degree according to the current gear shift vehicle speed; A current speed calibration module, used for generating current speed calibration data corresponding to the current speed according to the current gear position, the current accelerator pedal opening, the current gear shift vehicle speed, the current gear shift time and the current gear shift impact degree; A next speed calibration module, used for executing the decrement of the current speed to obtain a next speed, and performing power downshift at the next speed to obtain next speed calibration data corresponding to the next speed; A next gear speed calibration module, used for executing the step of incrementing the current gear to obtain the next gear, and performing power downshifting at the next gear to obtain the next gear speed calibration data corresponding to the next gear; The downshift curve generating module is used to adjust the current accelerator pedal opening, obtain downshift vehicle speed calibration data of different accelerator pedal openings of each gear, and generate a downshift curve of the dual clutch transmission according to the downshift vehicle speed calibration data.

9. A virtual calibration test bench, characterized in that: The virtual calibration test bench includes a vehicle simulation model and the power downshift vehicle speed calibration device as claimed in claim 8; The vehicle simulation model is used to simulate the operation of a dual-clutch transmission to perform closed-loop control on the dual-clutch transmission.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the power downshift vehicle speed calibration method according to any one of claims 1 to 7 when executed.

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