Hybrid transmission flywheel unlocking unloading control strategy and electronic equipment and vehicle

Abstract

The present application relates to the technical field of vehicle hybrid transmission control, in particular to a single-planet-row hybrid transmission flywheel unlocking unloading control strategy, electronic equipment and vehicle. Through real-time control of the flywheel unlocking unloading process, combined with the calculation of forward and reverse unloading torque and the execution of the unloading program during the flywheel unlocking process, the successful unlocking of the hybrid transmission flywheel under different working conditions can be ensured, so as to smoothly exit the ECVT dual-motor pure electric driving mode and improve 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 conditions, the flywheel unloading completion can be accurately judged, so that the flywheel unlocking timing control can be smoothly carried out.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle hybrid transmission control, in particular to a single-planet-row hybrid transmission flywheel unlocking and unloading control strategy, an electronic device and a vehicle. BACKGROUND

[0002] In the prior art single-planet-row power-split multi-gear hybrid transmission, the engine (ICE) flywheel is connected with the planet carrier of the single-planet-row, the generator (EM2) is connected with the sun gear and is integrated with the entire planet row through the left and right sides of the S2 synchronizer and the sun gear-generator is static, the ring gear is connected to the wheels through the left and right sides of the S1 synchronizer and the two sets of gear trains with different gear ratios through the differential and half shaft, and the drive motor (EM1) is also connected to the wheels through the differential and half shaft. When the S2 synchronizer is in the middle position and the S1 synchronizer is to the left / right side, i.e. the transmission gear is in the ECVT dual-motor drive mode, based on the power kinematics principle of the single-planet-row, the engine output power is transmitted to the wheels through the planet carrier, part of the ring gear, the S1 synchronizer and the gear train, and the other part is transmitted to the generator for power generation, thus realizing the ECVT power-split mode.

[0003] In the prior art single-planet-row power-split multi-gear hybrid transmission, the flywheel is spaced apart at a fixed angle by a certain number of grooves, the hybrid transmission housing connected with the engine flywheel housing has two locking solenoid valves 1 and 2 fixed on the side, the vehicle virtual controller (VECU) sends an unlocking instruction to the locking controller, the locking controller controls the on-off of the solenoid valve coil and the action of the return spring to make the solenoid valve push rod extend and retract, thus realizing the locking and unlocking of the flywheel, realizing the entry and exit of the ECVT dual-motor pure electric mode, and the locking controller feeds back the unlocking state of the solenoid valve to the VECU.

[0004] In the prior art, the VECU application layer software requests to enter or exit the ECVT dual-motor drive mode based on the designed energy management strategy, as shown in Figure 1 The flywheel is in the locked state, and the vehicle drive mode is ECVT dual-motor pure electric drive. When the VECU requests to exit the dual-motor pure electric drive mode, the VECU sends an unlocking instruction, but when the locking control receives the unlocking instruction and makes the solenoid valve coil energized and the push rod retracted, two situations may occur: Figure 1 (a) the left solenoid valve 1 push rod is pushed to the left side of the flywheel groove, radial friction occurs between the push rod and the groove and hinders the retraction of the push rod, and the right push rod has a small gap with the groove and no friction, which will cause the left push rod to fail to retract; similarly, Figure 1(b) for the right electromagnetic valve 2 push rod to the flywheel groove right side, also make the right push rod received radial friction and can not be retracted; ultimately resulting in flywheel unlocking failure, the vehicle ECVT double motor pure electric drive mode can not exit, seriously affect the driving experience. SUMMARY

[0005] The technical problems to be solved by the present application are: in view of the deficiencies of the prior art, a hybrid transmission flywheel unlocking unloading control strategy is provided, which can ensure the successful unlocking of the hybrid transmission flywheel under different working conditions, so as to smoothly exit the ECVT double motor pure electric drive mode and improve the driving experience of the vehicle.

[0006] To solve the above technical problems, the technical scheme adopted by the present application is:

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

[0008] S1, after receiving the flywheel unlocking unloading request, it is judged whether the current generator torque is lower than the flywheel unlocking unloading allowable value, if yes, step S2 is continued to execute;

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

[0010] S3, when the flywheel forward unloading control execution time exceeds the single-sided flywheel unlocking unloading time t1, it is judged 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 the flywheel reverse unloading control is executed;

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

[0013] S6, when the flywheel reverse unloading is completed and the flywheel unlocking unloading request is ended, it is judged that the flywheel unlocking unloading control execution is completed;

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

[0015] Further, when the flywheel forward unloading control is executed, the execution torque T 正 is calculated as follows:

[0016] T 正 = T p1 *(1+Z R / Z S )

[0017] In the formula, Tp1 Z is the target torque unloaded from the positive flywheel of the generator output. R and Z S These refer to the number of teeth on the gear ring and the number of teeth on the sun gear, respectively.

[0018] Furthermore, the single-sided 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 backlash after the generator torque is transmitted to the flywheel.

[0019] Furthermore, during the execution of the flywheel reverse unloading control, the flywheel's execution torque T 反 The calculation is as follows:

[0020] T 反 =-T p2 *(1+Z R / Z S )

[0021] In the formula, T p2 Z is used to unload the target torque from the reverse flywheel output by the generator. R and Z S These refer to the number of teeth on the gear ring and the number of teeth on the sun gear, respectively.

[0022] Furthermore, when the actual generator torque reaches n1 (n1 = 0.95) times the forward flywheel unloading target torque, and the duration exceeds the single-sided flywheel unlocking and unloading time t1, it is directly determined that the forward unloading of the flywheel is complete.

[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-sided flywheel unlocking and unloading time t1, it is directly determined that the flywheel reverse unloading is complete.

[0024] Furthermore, the preset speed threshold w under the flywheel lock-up condition is obtained based on the engine speed experimental calibration, and the preset time t2 is calculated by multiplying the average value of the flywheel speed signal jump by a correction coefficient.

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

[0026] This invention proposes a control strategy for unlocking and unloading the flywheel of a hybrid transmission. By controlling the flywheel unlocking and unloading process in real time, combined with the calculation of forward and reverse unloading torque and the execution of the unloading program during the flywheel unlocking process, the successful unlocking of the hybrid transmission flywheel under different operating conditions can be ensured, thereby smoothly exiting the ECVT dual-motor pure electric drive mode and improving the vehicle driving experience. At the same time, by using methods for judging the completion of forward and reverse unloading of the flywheel and methods for judging the completion of unloading under abnormal conditions, the completion of flywheel unloading can be accurately determined, ensuring the smooth execution of flywheel unlocking timing control. Attached Figure Description

[0027] Figure 1 A schematic diagram of the flywheel locking state of the single-planet-row hybrid transmission in the background of the present application;

[0028] Figure 2 A flowchart of the flywheel unlocking and unloading control strategy of the single-planet-row hybrid transmission in Embodiment One of the present application;

[0029] Figure 3 A principle block diagram of the flywheel unlocking and unloading control strategy of the single-planet-row hybrid transmission in Embodiment Two of the present application;

[0030] Figure 4 A schematic diagram of the change of the generator torque during the flywheel unloading process in Embodiment Two of the present application. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present application clearer and more comprehensible, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0032] It should be noted that, according to the needs of implementation, each step / component described in the present application can be split into more steps / components, or two or more steps / components or part of the operations of the steps / components can be combined into a new step / component to achieve the objectives of the present application.

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

[0034] Embodiment One, the present embodiment provides a flywheel unlocking and unloading control strategy of a hybrid transmission, as shown in Figure 2 mainly includes:

[0035] S1, after receiving the flywheel unlocking and unloading request, it is judged whether the current generator torque is lower than the flywheel unlocking and unloading allowable value, if yes, step S2 is continued to be executed;

[0036] S2, the generator outputs the positive flywheel unloading target torque, and the flywheel positive unloading control is executed;

[0037] S3, when the flywheel forward unloading control execution time exceeds the single-sided flywheel unlock unloading time t1, it is judged 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 the flywheel reverse unloading control is executed;

[0039] S5, when the flywheel reverse unloading control execution time exceeds the single-sided flywheel unlock unloading time t1, it is judged that the flywheel reverse unloading is completed;

[0040] S6, when the flywheel reverse unloading is completed and the flywheel unlock unloading request is ended, it is judged that the flywheel unlock unloading control execution is completed;

[0041] S7, when the flywheel speed exceeds the preset speed threshold w in the flywheel locking condition and the duration exceeds the preset time t2, it is directly judged that the flywheel unlock unloading control execution is completed.

[0042] Further, when the flywheel forward unloading control is executed, the execution torque T 正 is calculated as follows:

[0043] T 正 = T p1 *(1+Z R / Z S )

[0044] In the formula, T p1 is the forward flywheel unloading target torque output by the generator, Z R and Z S are the gear ring tooth number and the sun gear tooth number in the gearbox respectively.

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

[0046] Further, when the flywheel reverse unloading control is executed, the execution torque T 反 is calculated as follows:

[0047] T 反 =-T p2 *(1+Z R / Z S )

[0048] In the formula, T p2 is the reverse flywheel unloading target torque output by the generator, Z R and Z S are the gear ring tooth number and the sun gear tooth number in the gearbox respectively.

[0049] Further, when the actual generator torque reaches n1 times the positive flywheel unloading target torque, and the duration exceeds the single-sided flywheel unlocking unloading time t1, it is directly judged that the flywheel positive 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-sided flywheel unlocking unloading time t1, it is directly judged that the flywheel reverse unloading is completed.

[0051] Further, the preset speed threshold w in the flywheel locking working condition is obtained according to engine speed experiment calibration, and the preset time t2 is calculated according to the average value of flywheel speed signal jump multiplied by a correction coefficient.

[0052] Embodiment two, the hybrid transmission flywheel unlocking unloading control strategy provided by the embodiment, as shown in Figure 3 The specific control strategy includes:

[0053] I. Flywheel unlocking unloading target generator torque calculation

[0054] 1) Positive flywheel unloading target generator torque value calculation and execution:

[0055] After receiving the flywheel unlocking unloading request, it is further judged whether the current generator torque is lower than the flywheel unlocking unloading allowable value (such as 5 Nm), so as to ensure that the generator driving torque exits when the ECVT double motor pure electric driving mode is used before the flywheel is unlocked. Generally, the vehicle driving demand is relatively small before the flywheel is unlocked, and the generator does not need to participate in driving, so the generator torque is 0 Nm. Then the flywheel positive unloading is triggered, that is, the generator outputs a positive target torque (such as 2 Nm), and the torque acting on the flywheel is 2 Nm*(1+Z R / Z S ) until the single-sided flywheel unlocking unloading time (such as 500 ms) is exceeded, and it is considered that the flywheel positive unloading is completed. The single-sided flywheel unlocking unloading time is calibrated according to the actual situation, and needs to follow two principles: ① actual generator torque response time; ② actual time required for generator output torque to be transmitted to the flywheel to eliminate 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 to realize that the actual generator torque exceeds 95% of the target torque) and reaches the single-sided flywheel unlocking unloading torque confirmation time (such as 300 ms), and the flywheel positive unloading is considered to be completed.

[0056] 2) Reverse flywheel unloading target generator torque value calculation and execution:

[0057] After determining that the flywheel forward unloading is completed, reverse unloading is triggered, the target generator torque is the opposite of the above-mentioned forward unloading target torque, and when the reverse unloading reaches the same one-way flywheel unlocking unloading time as the forward unloading, it is considered that the flywheel reverse unloading is completed. Similarly, it is also considered that the flywheel reverse unloading is completed after determining that the actual negative generator torque approaches the target generator torque (the software strategy is to realize that the actual generator torque is lower than 95% of the target torque) and reaches the same one-way flywheel unlocking unloading torque confirmation time. The generator torque during the flywheel unloading process is as shown in Figure 4

[0058] II. Flywheel unlocking unloading completion determination

[0059] After determining that the flywheel reverse unloading is completed, it is considered that the entire flywheel unlocking unloading is completed, and the flywheel unlocking unloading completion flag is reset until the flywheel unloading request is 0. There is another abnormal condition: the speed exceeds the threshold (such as 100 rpm) in the flywheel locking condition, according to the flywheel unlocking timing control strategy, it will directly enter the unlocking timing state control, and the flywheel unlocking unloading request is issued. At this time, it is also considered that the unlocking unloading is completed, in order to filter out the short-term speed signal abnormal jump and misjudge, the speed needs to exceed the threshold for a certain time (such as 50 ms).

[0060] Embodiment three, based on the same inventive concept, the embodiment further provides a vehicle electronic device, comprising a memory, a processor and a program stored in the memory and executable on the processor, and the processor executes the program to realize the hybrid transmission flywheel unlocking unloading control strategy as described above.

[0061] Embodiment four, based on the same inventive concept, the embodiment further provides a hybrid vehicle, the vehicle is provided with the vehicle electronic device as described above.

[0062] Further, the parts not described in detail in the present application are the same as or realized by the prior art.

[0063] In summary:

[0064] The present application proposes a hybrid transmission flywheel unlocking unloading control strategy, through real-time control of the flywheel unlocking unloading process, combined with calculation of forward and reverse unloading torques during flywheel unlocking and unloading program execution, the successful unlocking of the flywheel of the hybrid transmission under different working conditions can be ensured, so as to smoothly exit the ECVT double-motor pure electric driving mode, and improve the vehicle driving experience. At the same time, through the flywheel unlocking forward and reverse unloading completion determination method and the unloading completion determination method under abnormal conditions, the flywheel unloading completion can be accurately determined, and the flywheel unlocking timing control can be smoothly performed.

[0065] ​Those skilled in the art will appreciate that embodiments of the present application can be readily used as software, hardware, or a combination of software and hardware. In a software embodiment, the methods can be tangibly embodied in a machine-readable storage medium with instructions to implement the embodiments of the present application. Alternatively, the present application can be implemented as a machine-readable storage medium comprising a computer program product, which, when executed by a machine, is configured to carry out the methods of the present application.

[0066] The present application is described in reference to the flowchart illustrations and / or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams.

[0067] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams.

[0068] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams.

[0069] Those skilled in the art will readily recognize that the above description has been presented only for the purposes of illustration and description and is not intended to be limiting. The present application is limited only by the claims.

Claims

1. A hybrid transmission flywheel unlocking and unloading control strategy, characterized in that, include: Upon receiving a 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 forward flywheel unloading target torque, and forward flywheel unloading control is executed. When the flywheel forward unloading control execution time exceeds the single-side flywheel unlocking and unloading time t1, it is determined that the flywheel forward unloading is complete, and the generator is controlled to reverse to output the reverse flywheel unloading target torque, and the flywheel reverse unloading control is executed. If the flywheel reverse unloading control execution time exceeds the single-sided flywheel unlocking unloading time t1, it is determined that the flywheel reverse unloading is complete. The flywheel unlocking unloading control execution is determined to be complete after the flywheel unlocking unloading request ends. If the flywheel speed exceeds the preset speed threshold w and the duration exceeds the preset time t2 under the flywheel locking condition, it is directly determined that the flywheel unlocking and unloading control has been completed.

2. The hybrid transmission flywheel unlocking and unloading control strategy according to claim 1, characterized in that, When the flywheel is subjected to forward unloading control, the flywheel's execution torque T 正 Based on the target torque T of the positive flywheel unloading from the generator output. p1 Combined with the number of teeth Z of the gear ring inside the gearbox R And the number of teeth Z of the sun gear S Calculation determined.

3. The hybrid transmission flywheel unlocking and unloading control strategy according to claim 1, characterized in that, The single-sided 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 backlash after the generator torque is transmitted to the flywheel.

4. The 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's execution torque T 反 Based on the target torque T of the reverse flywheel unloading from the generator output. p2 Combined with the number of teeth Z of the gear ring inside the gearbox R And the number of teeth Z of the sun gear S Calculation determined.

5. The hybrid transmission flywheel unlocking and unloading control strategy according to claim 2, characterized in that, When the actual generator torque reaches n1 times the target torque T for forward flywheel unloading... p1 If the duration exceeds the single-sided flywheel unlocking and unloading time t1, then the flywheel is directly judged to have completed forward unloading.

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

7. The hybrid transmission flywheel unlocking and unloading control strategy according to claim 1, characterized in that, The preset speed threshold w under the flywheel lock-up condition is obtained by engine speed test calibration, and the preset time t2 is calculated by multiplying the average value of the flywheel speed signal jump by a 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, it implements the hybrid transmission flywheel unlocking and unloading control strategy as described in any one of claims 1 to 7.

9. A non-transitory readable storage medium having a program stored thereon, characterized in that, When executed by the vehicle's electronic equipment, the program implements the hybrid transmission flywheel unlocking and unloading control strategy as described in any one of claims 1 to 7.

10. A hybrid vehicle, characterized in that: Includes the vehicle electronic equipment as described in claim 8.

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