Hybrid gearbox flywheel unlocking and unloading control strategy, electronic equipment and vehicle

Abstract

The invention relates to the technical field of vehicle hybrid gearbox control, in particular to a flywheel unlocking and unloading control strategy for a single planet row type hybrid gearbox, electronic equipment and a vehicle. By means of real-time control over the flywheel unlocking and unloading process, in combination with calculation of forward and reverse unloading torque and unloading program execution in the flywheel unlocking process, successful unlocking of the hybrid gearbox flywheel under different working conditions can be guaranteed, an ECVT dual-motor pure electric drive mode is successfully quitted, and the vehicle driving experience is improved; meanwhile, through a flywheel unlocking forward and reverse unloading completion judgment method and an unloading completion judgment method under the abnormal condition, flywheel unloading completion can be accurately judged, and flywheel unlocking time sequence control is smoothly carried out.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle hybrid transmission control, and in particular to a flywheel unlocking and unloading control strategy for a single planetary gearbox hybrid transmission, and electronic equipment and a vehicle. Background Art

[0002] In the prior art single planetary gearbox with power split multi-speed hybrid transmission, the flywheel of the engine (ICE) is connected to the planet carrier of the single planetary gearbox, the generator (EM2) is connected to the sun gear and is engaged on the left and right sides of the S2 synchronizer to realize the integration of the entire planetary gearbox and the stationary sun gear-generator. The ring gear is connected to the wheels through the left and right sides of the S1 synchronizer respectively with two sets of gear trains with different speed ratios through the differential and half-axles, and the drive motor (EM1) and another set of gear trains are also connected to the wheels through the differential and half-axles. Among them, when the S2 synchronizer is in the middle position and the S1 synchronizer is to the left / right side, that is, the gearbox gear is in the ECVT dual-motor drive mode. Based on the dynamic kinematics principle of the single planetary gearbox, the engine output power is transmitted to the wheels through a part of the planet carrier through the ring gear, S1 synchronizer and gear train, and the other part is transmitted to the generator through the sun gear for power generation, thus realizing the ECVT power split mode.

[0003] In the single planetary gearbox power-split multi-speed hybrid transmission of the prior art, a certain number of grooves are spaced apart on the flywheel at fixed angles. Two locking solenoid valves 1 and 2 are fixed on the hybrid transmission housing side connected to the engine flywheel housing. The vehicle virtual controller (VECU) sends an unlocking command to the locking controller, which controls the on and off of the solenoid valve coil and the action of the return spring, so that the solenoid valve push rod extends and retracts to achieve locking and unlocking of the flywheel, thereby achieving entry and exit of the ECVT dual-motor pure electric mode. At the same time, the locking controller feeds back the unlocking status of the solenoid valve to the VECU.

[0004] In the prior art, during vehicle driving, the VECU application layer software requests to enter or exit the ECVT dual-motor drive mode based on the designed energy management strategy, such as Figure 1 The figure shows the flywheel locked state. The corresponding vehicle driving mode is ECVT dual-motor pure electric drive. When the dual-motor pure electric drive mode is requested to exit, the VECU issues an unlock command. However, when the lock control receives the unlock command and retracts the solenoid valve energized push rod, two situations may occur: Figure 1 In (a), the push rod of the left solenoid valve 1 is pushed to the left side of the flywheel groove, and radial friction is generated between the push rod and the groove, which prevents the push rod from retracting. However, there is a small gap between the push rod and the groove on the right side and no friction, which makes the push rod on the left side unable to retract. Similarly, Figure 1(b) The push rod of the right solenoid valve 2 is pushed to the right side of the flywheel groove, which will also cause radial friction on the right push rod and make it unable to retract; eventually, the flywheel unlocking fails, making it impossible to exit the ECVT dual-motor pure electric drive mode of the vehicle, seriously affecting the driving experience. Summary of the invention

[0005] The technical problem to be solved by the present invention is: in view of the shortcomings of the existing technology, a hybrid transmission flywheel unlocking and unloading control strategy is provided, which can ensure the successful unlocking of the hybrid transmission flywheel under different working conditions, thereby smoothly exiting the ECVT dual-motor pure electric drive mode and improving the vehicle driving experience.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A hybrid transmission flywheel unlocking and unloading control strategy, comprising:

[0008] S1, after receiving the flywheel unlocking and unloading request, determine whether the current generator torque is lower than the flywheel unlocking and unloading allowable value, if so, continue to execute step S2;

[0009] S2, the generator outputs the forward flywheel unloading target torque and executes the flywheel forward unloading control;

[0010] S3, when the flywheel forward unloading control execution time exceeds the single-side flywheel unlocking unloading time t1, it is determined that the flywheel forward unloading is completed;

[0011] S4, when the flywheel forward unloading is completed, the generator outputs the reverse flywheel unloading target torque and executes the flywheel reverse unloading control;

[0012] S5, when the flywheel reverse unloading control execution time exceeds the single-side flywheel unlocking unloading time t1, it is determined that the flywheel reverse unloading is completed;

[0013] S6, when the flywheel reverse unloading is completed and the flywheel unlocking unloading request is completed, it is determined that the flywheel unlocking unloading control is executed;

[0014] S7, when the flywheel speed exceeds the preset speed threshold w under the flywheel locking condition and the duration exceeds the preset time t2, it is directly determined that the flywheel unlocking and unloading control is completed.

[0015] Furthermore, when the flywheel forward unloading control is executed, the execution torque T of the flywheel 正 The calculation is as follows:

[0016] T 正 =T p1 *(1+Z R / Z S )

[0017] Where, Tp1 The forward flywheel unloading target torque output by the generator, Z R and Z S They are the number of teeth on the ring gear and the number of teeth on the sun gear in the gearbox respectively.

[0018] Furthermore, the single-side flywheel unlocking and unloading time t1 is calculated and determined based on the actual generator torque response time plus the time required to eliminate the gear clearance after the generator torque is transmitted to the flywheel.

[0019] Furthermore, when the flywheel reverse unloading control is executed, the execution torque T of the flywheel 反 The calculation is as follows:

[0020] T 反 =-T p2 *(1+Z R / Z S )

[0021] Where, T p2 The reverse flywheel unloading target torque output by the generator, Z R and Z S They are the number of teeth on the ring gear and the number of teeth on the sun gear in the gearbox respectively.

[0022] Further, when the actual generator torque reaches n1 (n1=0.95) times the forward flywheel unloading target torque, and the duration exceeds the single-side flywheel unlocking unloading time t1, it is directly determined that the flywheel forward unloading is completed;

[0023] Furthermore, when the actual generator torque reaches n2 (n2=0.95) times the reverse flywheel unloading target torque and the duration exceeds the single-side flywheel unlocking unloading time t1, it is directly determined that the flywheel reverse unloading is completed.

[0024] Furthermore, the preset speed threshold w under the flywheel locking condition is obtained according to the engine speed experimental calibration, and the preset time t2 is calculated and obtained by multiplying the average value of the flywheel speed signal jump by the correction coefficient.

[0025] Compared with the prior art, the present invention has the following main advantages:

[0026] The present invention proposes a hybrid transmission flywheel unlocking and unloading control strategy. Through real-time control of the flywheel unlocking and unloading process, combined with the calculation of the forward and reverse unloading torque during the flywheel unlocking process and the execution of the unloading program, it can ensure the successful unlocking of the hybrid transmission flywheel under different working conditions, thereby smoothly exiting the ECVT dual-motor pure electric drive mode and improving the vehicle driving experience; at the same time, through the flywheel unlocking forward and reverse unloading completion judgment method and the unloading completion judgment method under abnormal circumstances, it can accurately judge that the flywheel unloading is completed, so that the flywheel unlocking timing control can proceed smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the locked state of the flywheel of a single planetary gearbox hybrid transmission in the background technology of the present invention;

[0028] Figure 2 This is a flow chart of a flywheel unlocking and unloading control strategy for a single planetary gearbox hybrid transmission in Embodiment 1 of the present invention;

[0029] Figure 3 It is a principle block diagram of the flywheel unlocking and unloading control strategy of the single planetary gearbox hybrid transmission in the second embodiment of the present invention;

[0030] Figure 4 Schematic diagram of the change of generator torque during flywheel unloading in the second embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, and two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically limited.

[0034] Embodiment 1: This embodiment provides a hybrid transmission flywheel unlocking and unloading control strategy, such as Figure 2 As shown, it mainly includes:

[0035] S1, after receiving the flywheel unlocking and unloading request, determine whether the current generator torque is lower than the flywheel unlocking and unloading allowable value, if so, continue to execute step S2;

[0036] S2, the generator outputs the forward flywheel unloading target torque and executes the flywheel forward unloading control;

[0037] S3, when the flywheel forward unloading control execution time exceeds the single-side flywheel unlocking unloading time t1, it is determined that the flywheel forward unloading is completed;

[0038] S4, when the flywheel forward unloading is completed, the generator outputs the reverse flywheel unloading target torque and executes the flywheel reverse unloading control;

[0039] S5, when the flywheel reverse unloading control execution time exceeds the single-side flywheel unlocking unloading time t1, it is determined that the flywheel reverse unloading is completed;

[0040] S6, when the flywheel reverse unloading is completed and the flywheel unlocking unloading request is completed, it is determined that the flywheel unlocking unloading control is executed;

[0041] S7, when the flywheel speed exceeds the preset speed threshold w under the flywheel locking condition and the duration exceeds the preset time t2, it is directly determined that the flywheel unlocking and unloading control is completed.

[0042] Furthermore, when the flywheel forward unloading control is executed, the execution torque T of the flywheel 正 The calculation is as follows:

[0043] T 正 =T p1 *(1+Z R / Z S )

[0044] Where, T p1 The forward flywheel unloading target torque output by the generator, Z R and Z S They are the number of teeth on the ring gear and the number of teeth on the sun gear in the gearbox respectively.

[0045] Furthermore, the single-sided flywheel unlocking and unloading time t1 is determined according to the actual generator torque response time and the time required to eliminate the gear clearance after the generator torque is transmitted to the flywheel.

[0046] Furthermore, when the flywheel reverse unloading control is executed, the execution torque T of the flywheel 反 The calculation is as follows:

[0047] T 反 =-T p2 *(1+Z R / Z S )

[0048] Where, T p2 The reverse flywheel unloading target torque output by the generator, Z R and Z S They are the number of teeth on the ring gear and the number of teeth on the sun gear in the gearbox respectively.

[0049] Further, when the actual generator torque reaches n1 times the forward flywheel unloading target torque and the duration exceeds the single-side flywheel unlocking unloading time t1, it is directly determined that the flywheel forward unloading is completed;

[0050] Further, when the actual generator torque reaches n2 times the reverse flywheel unloading target torque and the duration exceeds the single-side flywheel unlocking unloading time t1, it is directly determined that the flywheel reverse unloading is completed.

[0051] Furthermore, the preset speed threshold w under the flywheel locking condition is obtained according to the engine speed experimental calibration, and the preset time t2 is calculated and obtained by multiplying the average value of the flywheel speed signal jump by the correction coefficient.

[0052] Embodiment 2: This embodiment provides a hybrid transmission flywheel unlocking and unloading control strategy, such as Figure 3 As shown, the specific control strategies include:

[0053] 1. Calculation of target generator torque when flywheel is unlocked and unloaded

[0054] 1) Calculation and execution of the target generator torque value for forward flywheel unloading:

[0055] After receiving the flywheel unlocking and unloading request, it is necessary to further determine whether the current generator torque is lower than the flywheel unlocking and unloading allowable value (such as 5Nm) to ensure that the generator driving torque exits in the ECVT dual-motor pure electric driving mode before the flywheel is unlocked. Under normal circumstances, the vehicle driving demand is relatively small before the flywheel is unlocked, and the generator does not need to participate in the driving, and the generator torque is 0Nm. Then the flywheel positive unloading is triggered first, that is, the generator outputs the positive target torque (such as 2Nm), and the corresponding torque acting on the flywheel is 2Nm*(1+Z R / Z S ) until the single-sided flywheel unlocking and unloading time (such as 500ms) is exceeded, the flywheel forward unloading is considered to be completed. The single-sided flywheel unlocking and unloading time is calibrated according to the actual situation and must follow two principles: ① the actual generator torque response time; ② the actual time required for the generator output torque to be transmitted to the flywheel to eliminate the gear clearance; in addition, it can also be judged that the actual generator torque is close to the target generator torque (the software strategy is achieved by the actual generator torque exceeding 95% of the target torque) and the single-sided flywheel unlocking and unloading torque confirmation time (such as 300ms) is reached. It is also considered that the flywheel forward unloading is completed.

[0056] 2) Calculation and execution of the target generator torque value for reverse flywheel unloading:

[0057] After it is determined that the flywheel forward unloading is completed, the reverse unloading is triggered, and the target generator torque is the opposite of the forward unloading target torque. When the reverse unloading reaches the same single-sided flywheel unlocking unloading time as the forward unloading, the flywheel reverse unloading is considered to be completed. Similarly, the flywheel reverse unloading can also be considered to be completed after the actual negative generator torque is close to the target generator torque (the software strategy is implemented with the actual generator torque being lower than 95% of the target torque) and reaching the same single-sided flywheel unlocking unloading torque confirmation time. During the flywheel unloading process, the generator torque is as follows: Figure 4 shown.

[0058] 2. Judgment of flywheel unlocking and unloading completion

[0059] After the above judgment that the flywheel reverse unloading is completed, the entire flywheel unlocking and unloading is considered to be completed, until the flywheel unloading request is set to 0 and the flywheel unlocking and unloading completion flag is reset. There is another abnormal situation: when the speed exceeds the threshold (such as 100rpm) when the flywheel is locked, according to the flywheel unlocking timing control strategy, it will directly enter the unlocking timing state control and issue a flywheel unlocking and unloading request. At this time, it is also considered that the unlocking and unloading is completed. Among them, in order to filter out the misjudgment caused by the abnormal jump of the short-term speed signal, the speed needs to exceed the threshold for a certain time (such as 50ms).

[0060] Embodiment 3: Based on the same inventive concept, this embodiment also provides a vehicle electronic device, including a memory, a processor, and a program stored in the memory and executable on the processor, wherein when the processor executes the program, the hybrid transmission flywheel unlocking and unloading control strategy as described above is implemented.

[0061] Embodiment 4: Based on the same inventive concept, this embodiment further provides a hybrid vehicle, wherein the vehicle is provided with the vehicle electronic device as described above.

[0062] Furthermore, all parts involved in this application that are not described in detail are the same as the prior art or are implemented using the prior art.

[0063] In summary:

[0064] The present invention proposes a hybrid transmission flywheel unlocking and unloading control strategy. Through real-time control of the flywheel unlocking and unloading process, combined with the calculation of the forward and reverse unloading torque during the flywheel unlocking process and the execution of the unloading program, it can ensure the successful unlocking of the hybrid transmission flywheel under different working conditions, thereby smoothly exiting the ECVT dual-motor pure electric drive mode and improving the vehicle driving experience; at the same time, through the flywheel unlocking forward and reverse unloading completion judgment method and the unloading completion judgment method under abnormal circumstances, it can accurately judge that the flywheel unloading is completed, so that the flywheel unlocking timing control can proceed smoothly.

[0065] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0066] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0067] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0068] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0069] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hybrid transmission flywheel unlocking and unloading control strategy, characterized in that: include: After receiving the flywheel unlocking and unloading request, if it is determined that the current generator torque is lower than the flywheel unlocking and unloading allowable value, the generator speed is increased to the positive flywheel unloading target torque, and the flywheel positive unloading control is executed; When the flywheel forward unloading control execution time exceeds the single-side flywheel unlocking unloading time t1, it is judged that the flywheel forward unloading is completed, and the generator is controlled to reverse and output the reverse flywheel unloading target torque, and the flywheel reverse unloading control is executed; When the flywheel reverse unloading control execution time exceeds the single-side flywheel unlocking unloading time t1, it is judged that the flywheel reverse unloading is completed, and until the flywheel unlocking unloading request is completed, it is judged that the flywheel unlocking unloading control execution is completed; When the flywheel speed exceeds the preset speed threshold w and lasts for more than the preset time t2 under the flywheel locking condition, it is directly determined that the flywheel unlocking and unloading control is completed.

2. A hybrid transmission flywheel unlocking and unloading control strategy according to claim 1, characterized in that: When the flywheel forward unloading control is executed, the flywheel execution torque T 正 According to the positive flywheel unloading target torque T output by the generator p1 , combined with the number of teeth Z in the gearbox ring R and the number of sun gear teeth Z S Calculated to determine.

3. A hybrid transmission flywheel unlocking and unloading control strategy according to claim 1, characterized in that: The single-side flywheel unlocking and unloading time t1 is calculated and determined based on the actual generator torque response time plus the time required to eliminate gear clearance after the generator torque is transmitted to the flywheel.

4. A hybrid transmission flywheel unlocking and unloading control strategy according to claim 1, characterized in that: When the flywheel reverse unloading control is executed, the flywheel execution torque T 反 According to the reverse flywheel unloading target torque T output by the generator p2 , combined with the number of teeth Z in the gearbox ring R and the number of sun gear teeth Z S Calculated to determine.

5. A hybrid transmission flywheel unlocking and unloading control strategy according to claim 2, characterized in that: When the actual generator torque reaches n1 times the forward flywheel unloading target torque T p1 , and the duration exceeds the single-side flywheel unlocking and unloading time t1, it is directly determined that the flywheel forward unloading is completed.

6. A hybrid transmission flywheel unlocking and unloading control strategy according to claim 4, characterized in that: When the actual generator torque reaches n2 times the reverse flywheel unloading target torque T p2 , and the duration exceeds the single-side flywheel unlocking and unloading time t1, it is directly determined that the flywheel reverse unloading is completed.

7. A hybrid transmission flywheel unlocking and unloading control strategy according to claim 1, characterized in that: The preset speed threshold w under the flywheel locking condition is obtained according to the engine speed experimental calibration, and the preset time t2 is calculated and obtained by multiplying the average value of the flywheel speed signal jump by the correction coefficient.

8. A vehicle electronic device, comprising a memory, a processor, and a program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the flywheel unlocking and unloading control strategy of the single planetary gearbox hybrid transmission as described in any one of claims 1 to 7 is implemented.

9. A non-transitory readable storage medium having a program stored thereon, characterized in that: When the program is executed by the vehicle electronic device, the flywheel unlocking and unloading control strategy of the single planetary gear hybrid transmission as claimed in any one of claims 1 to 7 is implemented.

10. A hybrid vehicle, characterized in that: The vehicle electronic device comprising the vehicle electronic device as claimed in claim 8.

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