Hybrid vehicle gear shifting control method and related equipment

Abstract

The invention discloses a hybrid power vehicle gear shifting control method and related equipment, and relates to the technical field of hybrid power vehicles, the method comprises the steps that if a vehicle is in a parking state and a gear shifting execution mechanism is in a neutral position, whether the vehicle meets a parking power generation condition or not is judged based on the electric quantity of a battery of the vehicle; if the vehicle meets the parking power generation condition, a gear shifting executing mechanism is controlled to be switched to a first joint position from a neutral gear position, so that the vehicle is parked to generate power; if the vehicle does not meet the parking power generation condition, the gear shifting executing mechanism is controlled to maintain the neutral gear position, and the vehicle is controlled to run in a pure electric mode; and if the vehicle speed reaches the preset threshold value in the running process of the vehicle, the gear shifting executing mechanism is controlled to be switched to the second joint position from the neutral gear position. By reasonably designing the gear shifting control logic, the hybrid power vehicle can complete switching in the optimal driving mode under different working conditions, and therefore self-adaptive gear shifting of the vehicle within the full vehicle speed range is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hybrid vehicles, and particularly relates to a hybrid vehicle gear shifting control method and related equipment. BACKGROUND

[0002] At present, a new energy gearbox is driven by pure electricity at a low speed stage and is driven by an engine at a medium and high speed stage. Therefore, during gear shifting, there is a large speed difference, and if the gear shifting control method is unreasonable, the synchronizer may be damaged and gear shifting cannot be performed. Especially in a full vehicle speed range operation scenario, related technologies lack dynamic regulation and control of gear shifting, so that full vehicle speed adaptive gear shifting cannot be achieved. SUMMARY

[0003] Embodiments of the present application provide a hybrid vehicle gear shifting control method and related equipment, so that gear shifting of a vehicle in a full vehicle speed range can be achieved at least to some extent.

[0004] A series of concepts in simplified form are introduced in the summary section, which will be further described in detail in the specific embodiments section. The summary section of the present application does not mean to attempt to limit the key features and necessary technical features of the claimed technical solution, and even less to determine the protection scope of the claimed technical solution.

[0005] The present application specifically includes the following aspects: In a first aspect, the present application provides a hybrid vehicle gear shifting control method, characterized by being applied to a hybrid gearbox system, wherein the hybrid gearbox system includes an engine, a generator, a drive motor, a planetary gear set and a gear shifting execution mechanism; the planetary gear set includes a carrier, a sun gear shaft and a ring gear shaft, the carrier is connected to the engine, and the sun gear shaft is connected to the generator; the gear shifting execution mechanism is arranged on the ring gear shaft, and the gear shifting execution mechanism has a neutral position, a first engagement position and a second engagement position, and the method includes: If the vehicle is in a parking state and the gear shifting execution mechanism is in the neutral position, it is determined whether the vehicle satisfies a parking power generation condition based on a battery power of the vehicle; If the vehicle satisfies the parking power generation condition, the gear shifting execution mechanism is controlled to switch from the neutral position to the first engagement position, so that the vehicle generates power in parking; If the vehicle does not satisfy the parking power generation condition, the gear shifting execution mechanism is controlled to maintain the neutral position, and the vehicle is controlled to travel in a pure electric mode; If the vehicle speed reaches a preset threshold during vehicle travel, the gear shifting execution mechanism is controlled to switch from the neutral position to the second engagement position.

[0006] In an implementation, the determining whether the vehicle meets the parked power generation condition based on the battery level of the vehicle comprises: If the battery level is less than a preset safety threshold, determining that the vehicle meets the parked power generation condition; If the battery level is greater than or equal to the preset safety threshold, determining that the vehicle does not meet the parked power generation condition.

[0007] In an implementation, the controlling the shift actuator to switch from the neutral position to the first engagement position if the vehicle meets the parked power generation condition comprises: If the vehicle meets the parked power generation condition, controlling the generator to adjust a first speed difference between the shift actuator and the first engagement position to be less than a preset speed; Based on the first speed difference, controlling the shift actuator to switch to the first engagement position and engage the shift actuator with the first engagement position.

[0008] In an implementation, the controlling the shift actuator to switch from the neutral position to the second engagement position if the vehicle speed reaches a preset threshold during driving comprises: If the vehicle speed reaches the preset threshold, controlling the shift actuator to retreat from the first engagement position to the neutral position; Controlling the generator to adjust a second speed difference between the shift actuator and the second engagement position to a preset range; Based on the second speed difference, controlling the shift actuator to switch to the second engagement position and engage the shift actuator with the second engagement position.

[0009] In an implementation, the shift actuator comprises a left engagement tooth and a right engagement tooth; the hybrid transmission system further comprises a direct drive gear and a housing; the left engagement tooth is arranged on the direct drive gear, and the right engagement tooth is arranged on the housing, wherein: The first engagement position is a position where the shift actuator engages with the left engagement tooth, and the second engagement position is a position where the shift actuator engages with the right engagement tooth.

[0010] In an implementation, the hybrid transmission system further comprises a differential and a one-way clutch, the one-way clutch is arranged between the direct drive gear and the differential, and the method further comprises: If the shift actuator is in the second engagement position and the wheel speed of the vehicle is greater than the rotational speed of the direct drive gear, the one-way clutch is controlled to be disconnected.

[0011] In an embodiment, the hybrid vehicle shift control method further comprises: If it is detected that the vehicle is in an acceleration overtake phase, the engine, the generator and the drive motor are controlled to drive the vehicle simultaneously.

[0012] In an embodiment, the hybrid vehicle shift control method further comprises: During the control of the shift actuator to switch gears, the engine is controlled to start and power is split through the planetary gear set.

[0013] In an embodiment, the hybrid vehicle shift control method further comprises: In the event of a failure of the drive motor, the shift actuator is controlled to switch from its current position to the second engagement position.

[0014] In a second aspect, the application further provides a hybrid vehicle shift control device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor is configured to execute the computer program stored in the memory to implement the steps of the hybrid vehicle shift control method according to any one of the first aspect.

[0015] In a third aspect, the application further provides a computer readable storage medium having a computer program stored thereon, wherein the computer program is executable by a processor to implement the steps of the hybrid vehicle shift control method according to any one of the first aspect.

[0016] In a fourth aspect, the application provides a hybrid transmission system, comprising an engine, a generator, a drive motor, a planetary gear set, a shift actuator, and a hybrid vehicle shift control device according to the second aspect, wherein: The planetary gear set comprises a carrier, a sun shaft and a ring shaft, the carrier is connected to the engine, and the sun shaft is connected to the generator; The shift actuator is arranged on the ring shaft, and the shift actuator has a neutral position, a first engagement position and a second engagement position; The hybrid vehicle shift control device is connected to the shift actuator, the generator and the drive motor, respectively.

[0017] The application provides a hybrid vehicle gear shifting control method and related device, and other advantages, objects and features of the application will be embodied in part by the following description, and will be understood by those skilled in the art through research and practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not intended to limit the scope of the present description. Moreover, like reference numerals designate similar parts throughout the several views in the drawings. In the drawings: Figure 1 A flowchart of a hybrid vehicle gear shifting control method provided by an embodiment of the application; Figure 2 A structural schematic diagram of a hybrid transmission system provided by an embodiment of the application; Figure 3 A structural schematic diagram of a hybrid vehicle gear shifting control device provided by an embodiment of the application; BRIEF DESCRIPTION OF DRAWINGS 1 - generator; 2 - drive motor; 3 - planetary gear set; 4 - gear shifting actuator; 5 - direct drive gear; 6 - intermediate shaft; 7 - one-way clutch; 300 - hybrid vehicle gear shifting control device; 310 - processor; 320 - memory; 321 - computer program. DETAILED DESCRIPTION

[0019] In order to better understand the technical solutions provided by the embodiments of the present application, the technical solutions of the embodiments of the present application will be described in detail below with reference to the drawings and specific embodiments. It should be understood that the specific features in the embodiments of the present application and the embodiments are detailed descriptions of the technical solutions of the embodiments of the present application, and are not limitations of the technical solutions of the present application. In the case of no conflict, the technical features in the embodiments of the present application and the embodiments can be combined with each other.

[0020] In this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element. The terms "two or more", "two or more than two", or "two or more than three" do not preclude distinct identification of individual members of a group or class.

[0021] At present, the new energy gearbox is driven by pure electricity at low speed stage, and is driven by engine at medium and high speed stages. Therefore, during the shifting process, there can be a large speed difference, and if the shifting control method is unreasonable, the synchronizer can be damaged and the shifting cannot be performed. Especially in the scene of running at full vehicle speed, the related technology lacks dynamic regulation and control of shifting, so that adaptive shifting at full vehicle speed cannot be achieved.

[0022] The shifting control method for a hybrid vehicle provided by the embodiments of the present application is applied to a hybrid gearbox system, as shown in the figure, the hybrid gearbox system comprises an engine, a generator 1 (such as EM2), a driving motor 2 (such as EM1), a planetary gear set 3, and a shifting execution mechanism 4 (such as a dog clutch S); the planetary gear set 3 comprises a carrier, a sun shaft, and a ring shaft, the carrier is connected to the engine, and the sun shaft is connected to the generator 1; the shifting execution mechanism 4 is arranged on the ring shaft, and the shifting execution mechanism 4 has a neutral position, a first engagement position, and a second engagement position. Figure 2

[0023] In some examples, the shifting execution mechanism 4 comprises a left engagement tooth and a right engagement tooth; the hybrid gearbox system further comprises a direct drive gear 5 and a housing; the left engagement tooth is arranged on the direct drive gear 5, and the right engagement tooth is arranged on the housing, wherein: The first engagement position is a position at which the shifting execution mechanism 4 is engaged with the left engagement tooth, and the second engagement position is a position at which the shifting execution mechanism 4 is engaged with the right engagement tooth.

[0024] ​For example, the shift actuator 4 is mounted on the gear ring shaft, and the gear hub of the shift actuator 4 is fixedly connected to the gear ring shaft via splines. When parking and generating electricity is required, the shift actuator 4 moves to the left and engages with the left engagement tooth on the direct drive gear 5; when engine direct drive is required, the shift actuator 4 moves to the right and engages with the right engagement tooth on the housing; in neutral, the shift actuator 4 is in the middle position and does not engage with any engagement tooth. Specifically, the direct drive gear 5 is constantly meshed with the gear on the intermediate shaft 6, responsible for transmitting engine power to the differential, and the differential is then responsible for transmitting power to the wheels, thereby realizing gear shifting.

[0025] Please see Figure 1 This is a flowchart illustrating a hybrid vehicle shift control method provided in an embodiment of this application, which may specifically include: S110. If the vehicle is in a parked state and the shift actuator 4 is in neutral, then determine whether the vehicle meets the conditions for parking and generating electricity based on the vehicle's battery charge.

[0026] For example, when the vehicle is parked and the shift actuator 4 is in neutral, the vehicle's control system will determine whether the parking power generation conditions are met based on the vehicle's battery charge. This intelligent charge assessment ensures timely replenishment of power when the battery is low, preventing the vehicle from being unable to start or drive normally due to low charge; simultaneously, it prevents the engine from starting when the battery is fully charged, reducing unnecessary fuel consumption and emissions.

[0027] In some examples, the determination of whether a vehicle meets the conditions for generating electricity while parked is based on the vehicle's battery charge level, including: If the battery charge is less than the preset safety threshold, the vehicle is deemed to meet the conditions for parking and generating electricity. If the battery charge is greater than or equal to the preset safety threshold, the vehicle is determined not to meet the conditions for generating electricity while parked.

[0028] For example, see Figure 2 When the vehicle is parked and the shift actuator 4 is in neutral, the vehicle's control system determines whether the conditions for parking power generation are met based on the vehicle's battery charge. This intelligent assessment of battery charge ensures timely replenishment of power when the battery is low, preventing issues with normal vehicle starting and driving due to low charge. Simultaneously, when the battery is fully charged, the engine is not started, reducing unnecessary fuel consumption and emissions.

[0029] For example, when a driver parks the vehicle in a parking lot and places the gear shift lever in the long-term parking position, the gear shift actuator 4 is in the neutral position. The vehicle monitors the battery level in real time, and if the battery level is detected to be lower than a preset safety threshold, it determines that parking power generation is required.

[0030] Specifically, when the vehicle is parked and the shift actuator 4 is in neutral, the control system compares the current battery charge with a preset safety threshold. If the battery charge is less than the preset safety threshold (e.g., 20%), the vehicle meets the conditions for parking and generating electricity, and the engine is started to generate power. If the battery charge is greater than or equal to the preset safety threshold, the vehicle does not meet the conditions for parking and generating electricity, and the pure electric mode is maintained. For example, the preset safety threshold is set to 20%. When the driver stops the vehicle, if the battery charge is 15%, the control system determines that parking and generating electricity is needed; if the battery charge is 25%, generating electricity is not needed, and the pure electric mode is maintained in standby mode.

[0031] S120. If the vehicle meets the conditions for parking and generating electricity, control the shift actuator 4 to switch from the neutral position to the first engaged position so that the vehicle can generate electricity while parked.

[0032] For example, if the parking power generation conditions are met, the shift actuator 4 is controlled to switch from the neutral position to the first engagement position to achieve parking power generation. When the vehicle's battery charge is lower than a preset safety threshold (e.g., 20%), the control system controls the generator 1 (P1 motor) to adjust its speed, keeping the speed difference between the shift actuator 4 and the left engagement tooth below 20 rpm. Then, the shift actuator 4 (e.g., a dog clutch S) moves to the left and engages with the left engagement tooth on the direct drive gear 5. After engagement, the generator 1 starts the engine, which drives the generator 1 to generate electricity through the planetary gear set 3, charging the battery. Smooth engagement is achieved by precisely controlling the speed difference, avoiding shift shock and mechanical damage; the parking power generation function can replenish the battery without affecting vehicle use, improving the vehicle's range.

[0033] In some examples, if the vehicle meets the conditions for parking and generating electricity, the shift actuator 4 is controlled to switch from the neutral position to the first engagement position, including: If the vehicle meets the conditions for parking and generating electricity, the generator 1 is controlled to adjust the first speed difference between the shift actuator 4 and the first engagement position to be less than the preset speed. Based on the first speed difference, the shift actuator 4 is controlled to switch to the first engagement position and engage with the first engagement position.

[0034] For example, when the vehicle's battery charge is below a preset safety threshold (e.g., 20%), the control system determines that parking and power generation are required. At this time, the control system controls the generator 1 to adjust its speed so that the first speed difference between the shift actuator 4 and the first engagement position (left engagement tooth) is less than a preset speed (e.g., 20 rpm). After the first speed difference meets the requirement, the control system moves the shift actuator 4 to the left and engages with the first engagement position on the direct drive gear 5. After engagement, the generator 1 starts the engine, and the engine drives the generator 1 to generate electricity through the planetary gear set 3, charging the vehicle's battery.

[0035] By precisely controlling the first speed difference, not only is shift shock and noise significantly reduced, improving driving comfort, but also impact wear between mechanical parts is reduced, extending the service life of the transmission, thereby improving the success rate of shifting and avoiding shift failure or synchronizer damage caused by speed mismatch.

[0036] Specifically, during parking-based power generation, the control system first starts generator 1 and adjusts its speed by regulating the output torque of generator 1, synchronizing the speed of shift actuator 4 with the left engagement gear. After speed synchronization, shift actuator 4 moves to the left and engages with the left engagement gear on the direct drive gear 5. After engagement, generator 1 starts the engine, which drives generator 1 to generate electricity via planetary gear set 3, charging the battery. Smooth engagement is achieved through precise control of the speed difference, avoiding shift shocks and mechanical damage. Simultaneously, the parking-based power generation function can replenish electricity without affecting vehicle use, improving the vehicle's range.

[0037] S130. If the vehicle does not meet the conditions for parking and generating electricity, control the shift actuator 4 to maintain the neutral position and control the vehicle to drive in pure electric mode.

[0038] For example, when the battery charge is higher than a preset safety threshold, the shift actuator 4 remains in neutral, and the vehicle is driven solely by the drive motor 2. At this time, the engine is not operating, and the planetary gear set 3 idles, reducing unnecessary power loss. The vehicle operates in pure electric mode without engine involvement, achieving zero emissions and low noise. Simultaneously, the neutral position reduces the drag torque of the transmission system, improving energy efficiency and increasing the pure electric driving range.

[0039] S140. If the vehicle speed reaches a preset threshold during driving, the shift actuator 4 is controlled to switch from the neutral position to the second engagement position.

[0040] For example, during vehicle operation, when the vehicle speed reaches a preset threshold, the shift actuator 4 is controlled to switch from the neutral position to the second engagement position. After the vehicle accelerates from a pure electric start, when the vehicle speed reaches 80km / h (the preset threshold), the control system first controls the shift actuator 4 to shift back to neutral from its current position. Then, the generator 1 adjusts the speed to keep the speed difference between the shift actuator 4 and the right engagement tooth within a preset range. Finally, the shift actuator 4 moves to the right and engages with the right engagement tooth on the housing, switching to engine direct drive mode. The drive mode is intelligently switched according to the vehicle speed. Engine direct drive is used at medium and high speeds to improve transmission efficiency; the shifting process uses motor speed control to adjust the speed difference, achieving smooth shifting and ensuring driving comfort.

[0041] In some examples, if the vehicle speed reaches a preset threshold while driving, the shift actuator 4 is controlled to switch from the neutral position to the second engagement position, including: If the vehicle speed reaches the preset threshold, the shift actuator 4 is controlled to return from the first engagement position to the neutral position; The generator 1 is controlled to adjust the second speed difference between the shift actuator 4 and the second engagement position to a preset range; Based on the second speed difference, the shift actuator 4 is controlled to switch to the second engagement position and engage with the second engagement position.

[0042] For example, when the vehicle speed reaches a preset threshold, the control system first controls the shift actuator 4 to return from its current position (such as the first engagement position) to the neutral position. Secondly, it controls the generator 1 to adjust its speed so that the second speed difference between the shift actuator 4 and the second engagement position (right engagement tooth) is within a preset range. Based on the required second speed difference, it controls the shift actuator 4 to switch to the second engagement position and complete the engagement.

[0043] For example, when the vehicle accelerates after starting in pure electric mode, and the speed reaches a preset threshold (e.g., 80 km / h), the control system begins to perform a gear shift: first, it controls the gear shift actuator 4 to return to the neutral position, cutting off power transmission; then, the generator 1 adjusts the speed to keep the second speed difference between the gear shift actuator 4 and the right engagement tooth within a preset range (e.g., 10-20 rpm); finally, it pushes the gear shift actuator 4 to move to the right, engaging with the right engagement tooth on the housing, completing the gear shift. Simultaneously, the drive motor 2 provides torque filling to ensure uninterrupted power during the gear shift process.

[0044] As can be seen, the drive mode is intelligently switched according to vehicle speed, with engine direct drive used at medium and high speeds to improve transmission efficiency. At the same time, the speed difference is controlled by generator 1 during gear shifting to reduce shift shock and achieve smooth shifting, which not only protects the transmission components but also ensures driving comfort.

[0045] In summary, the hybrid vehicle shift control method provided in this application adopts a simple structure of planetary gear set and single-set dog clutch, which can flexibly switch between multiple modes such as power split drive, engine direct drive, parking generator, and pure electric drive, so that the engine always operates in the high-efficiency range, significantly improving the vehicle's fuel economy. By precisely controlling the speed difference between the shift actuator and the engagement teeth through the generator, combined with the torque filling technology of the drive motor, smooth shifting without power interruption is achieved, effectively avoiding synchronizer damage and reducing shift shock. The parking generator mode can automatically start when the battery power is low to ensure sufficient power, while the neutral position design and the application of the one-way clutch reduce the drag torque during pure electric driving and improve the driving range. Under rapid acceleration, the engine, generator and drive motor output power in a coordinated manner, significantly enhancing the vehicle's power performance. At the same time, through multi-mode optimization and efficient energy recovery, it takes into account energy saving, environmental protection and driving comfort, and is applicable to a variety of vehicle models.

[0046] In some examples, the shift actuator 4 includes a left engagement tooth and a right engagement tooth; the hybrid transmission system also includes a direct drive gear 5 and a housing; the left engagement tooth is disposed on the direct drive gear 5, and the right engagement tooth is disposed on the housing, wherein: The first engagement position is the position where the shift actuator 4 engages with the left engagement tooth, and the second engagement position is the position where the shift actuator 4 engages with the right engagement tooth.

[0047] For example, the shift actuator 4 (such as the dog clutch S) includes a left engagement tooth and a right engagement tooth: the left engagement tooth is disposed on the direct drive gear 5, and the right engagement tooth is fixed to the housing of the hybrid transmission system. The first engagement position refers to the position where the shift actuator 4 engages with the left engagement tooth, and the second engagement position refers to the position where the shift actuator 4 engages with the right engagement tooth. Specifically, the shift actuator 4 is mounted on the gear ring shaft and fixed to the gear ring shaft via splines. When parking and generating electricity is required, the shift actuator 4 moves to the left and engages with the left engagement tooth on the direct drive gear 5; when engine direct drive is required, the shift actuator 4 moves to the right and engages with the right engagement tooth on the housing; in neutral, the shift actuator 4 is in the intermediate position and does not engage with any engagement tooth.

[0048] The shift actuator provided in this application has a simple and compact structure. It achieves switching between multiple drive modes through a set of clutches, and the engagement teeth are rationally designed to ensure a short power transmission path and high transmission efficiency. At the same time, the right engagement tooth design fixed on the housing provides stable support for direct engine drive.

[0049] In some examples, the hybrid transmission system also includes a differential and a one-way clutch 7, the one-way clutch 7 being disposed between the direct drive gear 5 and the differential, and the method further includes: If the shift actuator 4 is in the second engaged position and the vehicle wheel speed is greater than the speed of the direct drive gear 5, then the one-way clutch 7 is disengaged.

[0050] For example, when the shift actuator 4 is in the second engaged position and the vehicle's wheel speed is greater than the speed of the direct drive gear 5, the control system controls the one-way clutch 7 to disengage. For instance, during high-speed driving, if the driver releases the accelerator pedal, the vehicle enters a coasting state, at which point the wheel speed may be higher than the speed of the direct drive gear 5. Upon detecting this situation, the control system controls the one-way clutch 7 to disengage, separating the wheels from the direct drive gear 5 and preventing engine drag. During vehicle coasting, the control system can promptly cut off power transmission, effectively reducing energy loss due to engine resistance and lowering drag torque, allowing the vehicle to coast a longer distance and significantly improving fuel economy. Furthermore, this method also protects the engine and hybrid transmission system from damage caused by overspeeding.

[0051] In some examples, the hybrid vehicle shift control method provided in this application further includes: If the vehicle is detected to be accelerating and overtaking, the engine, generator 1, and drive motor 2 are controlled to drive the vehicle simultaneously.

[0052] For example, when the control system detects that the vehicle is accelerating to overtake, it simultaneously controls the engine, generator 1, and drive motor 2 to drive the vehicle. For instance, if the vehicle is traveling at 80 km / h on a highway and the driver presses the accelerator pedal to overtake, the control system, upon detecting the acceleration demand, simultaneously starts the engine, generator 1, and drive motor 2. These three components work together to output power: the engine transmits power through the planetary gear set 3 and the direct-drive gear 5, while generator 1 and drive motor 2 directly provide electric drive force. The combined force of these three components rapidly accelerates the vehicle to the speed required for overtaking. When the vehicle is in special operating conditions such as acceleration and overtaking, the coordinated drive of the engine, generator 1, and drive motor 2 provides maximum power output, significantly improving the vehicle's acceleration performance and meeting the power demands under special conditions, thereby enhancing driving safety. Furthermore, this drive method fully utilizes the advantages of each power source, achieving optimal power distribution.

[0053] In some examples, the hybrid vehicle shift control method provided in this application further includes: During the process of controlling the shift actuator 4 to switch gears, the engine is started and power is split through the planetary gear set 3; wherein, the power split includes: driving the generator 1 to generate electricity based on the first output power of the engine, and transmitting the second output power of the engine to the wheels of the vehicle through the gear ring shaft to drive the vehicle.

[0054] For example, when the vehicle's control system receives a shift request or predicts that a shift is about to occur, it first controls the engine to start and run at a preset target speed. Then, by coordinating the control of the engine throttle opening and the generator load, the engine's output power is actively distributed into two parts (i.e., the first output power and the second output power). One part of the power (the first output power) is transmitted to the generator 1 through the sun gear shaft of the planetary gear set 3, driving the generator 1 to generate electricity and charge the energy storage device. The other part of the power (the second output power) is coupled to the ring gear shaft through the planet carrier of the planetary gear set 3, output through the ring gear shaft, and then transmitted to the wheels through the gears of the intermediate shaft 6 and the differential. Thus, the vehicle is continuously provided with driving force throughout the entire time interval during which the shift actuator 4 performs position switching.

[0055] Furthermore, the power splitting process relies on coordinated control between the engine controller, generator controller, and vehicle control system to ensure smooth power transmission and precise energy management. The vehicle control system calculates in real time the total torque required to maintain the current driving force demanded by the vehicle, and deduces the required output power of the engine (this output power is the total power required by the engine). Then, based on the current state of the energy storage device and the principle of optimal system efficiency, it calculates the allocation ratio of the engine's output power for driving generator 1 (i.e., the first output power allocation ratio) and the allocation ratio for directly driving the vehicle (i.e., the second output power allocation ratio), and generates corresponding control commands, which are sent to the engine controller and generator controller respectively. The engine controller adjusts the engine operating conditions according to the control commands to output the required output power, while the generator controller precisely controls the magnitude of the first output power allocated to generator 1 by adjusting the generator load, so that the second output power ultimately transmitted to the gear shaft for driving the vehicle remains stable, achieving seamless connection of driving force during gear shifting.

[0056] By introducing an engine power split mode during the brief period of gear shifting, the energy output by the engine is cleverly used to drive the vehicle and generate electricity simultaneously. This ensures that while the original power transmission path is disconnected by the gear shifting actuator 4, there is still a mechanical path through the ring gear shaft of the planetary gear set 3 to continuously output power to the wheels. This completely avoids the power interruption that is unavoidable in traditional gear shifting, which not only significantly improves the driving smoothness and ride comfort of the vehicle, but also achieves efficient energy utilization, improving the vehicle's economy and the reliability of the gear shifting process.

[0057] In some examples, the hybrid vehicle shift control method provided in this application further includes: In the event of a failure of the drive motor 2, the shift actuator 4 is controlled to switch from its current position to the second engagement position.

[0058] For example, the vehicle's control system continuously monitors the operating status of the drive motor 2. When it determines that the drive motor 2 has malfunctioned and cannot provide drive torque, it immediately triggers a fault operation mode. Subsequently, the vehicle's control system sends a control command to the shift actuator 4, controlling it to move to the second engagement position regardless of whether it is currently in neutral or the first engagement position. During this movement, if there is a speed difference between the shift actuator 4 and the second engagement position, the generator 1 is controlled to adjust its speed to eliminate the speed difference, creating conditions for the smooth engagement of the shift actuator 4 with the right engagement tooth fixed on the housing. After the shift actuator 4 successfully switches to the second engagement position, the engine's power can be transmitted to the differential and wheels through the planetary carrier, ring gear shaft, shift actuator 4, direct drive gear 5, and intermediate shaft 6, thereby establishing an engine direct drive path that does not rely on the drive motor 2.

[0059] Specifically, when the vehicle's control system issues a shift command, it coordinates the engine controller and the generator controller to control the generator 1 to precisely adjust the speed of the gear ring shaft, so that the speeds at both ends of the shift actuator 4 are synchronized. After confirming that the speed difference has reached the preset range for allowable engagement, the system controls the shift actuator 4 to complete the final engagement. After that, the vehicle's control system completely hands over the drive torque request to the engine controller. By adjusting the engine throttle opening and fuel injection quantity, the engine outputs torque that meets the vehicle's driving needs, so that even in the special condition where the drive motor 2 completely fails, the vehicle can still maintain basic driving capability by relying on the engine.

[0060] By introducing a dedicated fault-tolerant control strategy for drive motor 2 failures, in the extreme case where drive motor 2 fails and loses its driving function, the vehicle's control system can automatically and quickly switch the power source from the failed drive motor 2 to the normal engine, and use the existing shift actuator 4 to construct a mechanical engine direct drive path, thereby ensuring that the vehicle continues to drive in the most basic driving mode, greatly improving the reliability and safety of the vehicle, and effectively avoiding the risk of the vehicle completely breaking down due to a sudden failure of drive motor 2.

[0061] It should be noted that the above embodiments are merely best examples and are not intended to limit the implementation of this application.

[0062] Furthermore, such as Figure 3 As shown, this application embodiment also provides a hybrid vehicle shift control device 300, including a processor 310, a memory 320, and a computer program 321 stored in the memory 320 and executable on the processor. When the processor 310 executes the computer program 321, it implements the steps of any of the above-described hybrid vehicle shift control methods.

[0063] Since the electronic device described in this embodiment is the device used to implement a hybrid vehicle shift control method in the embodiments of this application, those skilled in the art can understand the specific implementation method and various variations of the electronic device in this embodiment based on the method described in the embodiments of this application. Therefore, how the electronic device implements the method in the embodiments of this application will not be described in detail here. Any device used by those skilled in the art to implement the method in the embodiments of this application falls within the scope of protection of this application.

[0064] In practical implementation, when the computer program 321 is executed by the processor, it can achieve the following: Figure 1 Any of the corresponding implementation methods in the embodiments.

[0065] Furthermore, this application also proposes a hybrid power transmission system, specifically as follows: Figure 2 As shown, it includes an engine, a generator 1, a drive motor 2, a planetary gear set 3, a shift actuator 4, and the aforementioned hybrid vehicle shift control device, wherein: Planetary gear set 3 includes a planet carrier, a sun gear shaft, and a ring gear shaft. The planet carrier is connected to the engine, and the sun gear shaft is connected to the generator 1. The gear shifting actuator 4 is mounted on the gear ring shaft, and the gear shifting actuator 4 has a neutral position, a first engagement position, and a second engagement position; The gear shift control device of the hybrid vehicle is connected to the gear shift actuator 4, the generator 1 and the drive motor 2 respectively.

[0066] For example, such as Figure 2 As shown, the hybrid transmission system includes an engine, a generator 1, a drive motor 2, a planetary gear set 3, and a shift actuator 4. The planetary gear set 3 includes a planet carrier, a sun gear shaft, and a ring gear shaft. The planet carrier is connected to the engine, and the sun gear shaft is connected to the generator 1. The shift actuator 4 is mounted on the ring gear shaft and has a neutral position, a first engagement position, and a second engagement position. The shift actuator 4 is mounted on the ring gear shaft, and its hub is fixed to the ring gear shaft via a spline. The shift actuator 4 includes a left engagement tooth and a right engagement tooth. The hybrid transmission system also includes a direct drive gear 5 and a housing. The left engagement tooth is located on the direct drive gear 5, and the right engagement tooth is located on the housing. When parking and generating electricity is required, the shift actuator 4 moves to the left and engages with the left engagement tooth on the direct drive gear 5. When engine direct drive is required, the shift actuator 4 moves to the right and engages with the right engagement tooth on the housing. In the neutral position, the shift actuator 4 is in the middle position and does not engage with any engagement tooth. Specifically, the direct drive gear 5 and the intermediate shaft 6 are constantly meshed, which is responsible for transmitting engine power to the differential. The differential is then responsible for transmitting power to the wheels, thereby achieving gear shifting.

[0067] Specifically, when parking for power generation is required, the shift actuator 4 moves to the left and engages with the left engagement tooth on the direct drive gear 5; when engine direct drive is required, the shift actuator 4 moves to the right and engages with the right engagement tooth on the housing; in neutral, the shift actuator 4 is in the middle position and does not engage with any engagement tooth. As shown in Table 1 below, the shift actuator 4 can correspond to different states in different driving modes.

[0068]

[0069] Table 1 For example, Table 1 above shows that the hybrid transmission system achieves multiple driving modes by controlling the switching of the shift actuator 4 between different engagement positions. When the shift actuator 4 is in the left engagement position, the engine power is input through the planetary carrier of the planetary gear set 3, transmitted through the ring gear shaft to the direct drive gear 5 which is fixed to the left engagement gear, and finally drives the wheels through the intermediate shaft 6 gear. At the same time, part of the power drives the generator to generate electricity through the sun gear shaft, realizing the parking power generation mode. When the shift actuator 4 is in the right engagement position, the ring gear shaft is fixed to the housing through the shift actuator 4, and the engine power is directly transmitted to the wheels through the planetary carrier and the ring gear shaft, realizing the engine direct drive mode. When the shift actuator 4 is in the neutral position, the ring gear shaft is disconnected from both the left and right engagement gears. At this time, the vehicle can be driven by the drive motor 2 alone to realize the pure electric mode, or the generator 1 can be driven by the engine to generate electricity and drive the vehicle through the drive motor 2 to realize the series mode.

[0070] When the vehicle needs to switch modes, the vehicle's control system first calculates the target mode based on the vehicle's state parameters, sends a shift command to the hybrid transmission system, and controls the shift actuator 4 to move towards the target position. If there is a speed difference at the target engagement position, the system controls the generator 1 to adjust the speed so that the speed difference between the two ends of the shift actuator 4 is less than the preset allowable engagement threshold. When the speed synchronization condition is met, the system controls the shift actuator 4 to complete the final engagement. At the same time, the control system redistributes the torque output of the engine and the generator 1 to complete the smooth transition of the driving mode.

[0071] By switching between three positions using a single shift actuator, multiple operating modes such as pure electric drive, series drive, parallel drive, power split, and engine direct drive are cleverly achieved, ensuring that the engine always operates in its high-efficiency range and significantly improving the vehicle's fuel economy. Simultaneously, during mode switching, the active synchronization of the generator and drive motor, along with the coordinated management of the control system, ensures smooth and continuous power transmission, avoiding shift shocks and power interruptions, thus enhancing driving quality and ride comfort. Furthermore, this hybrid transmission system boasts a simple and reliable configuration, effectively controlling manufacturing costs and system complexity while achieving multiple modes, demonstrating significant engineering application value.

[0072] In summary, the hybrid vehicle shift control method and related equipment provided in this application adopt a simple structure of planetary gear set and single-set dog-tooth clutch, which can flexibly switch between multiple modes such as power split drive, engine direct drive, parking generator, and pure electric drive, so that the engine always works in the high-efficiency range, significantly improving the fuel economy of the vehicle. By precisely controlling the speed difference between the shift actuator and the engagement teeth through the generator, combined with the torque filling technology of the drive motor, smooth shifting without power interruption is achieved, effectively avoiding synchronizer damage and reducing shift shock. The parking generator mode can automatically start when the battery power is low to ensure sufficient power, while the neutral position design and the application of one-way clutch reduce the drag torque during pure electric driving and improve the driving range. Under rapid acceleration, the engine, generator and drive motor output power in a coordinated manner, which significantly enhances the vehicle's power performance. At the same time, through multi-mode optimization and efficient energy recovery, it takes into account energy saving, environmental protection and driving comfort, and is suitable for a variety of vehicle models.

[0073] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0074] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-readable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-readable program code.

[0075] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this 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 computer, 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 a machine for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0076] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0077] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0078] This application also provides a computer program product including computer software instructions that, when executed on a processing device, cause the processing device to execute a hybrid vehicle shift control method.

[0079] A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state disk (SSD)).

[0080] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0081] In the several embodiments provided in this application, it should be understood that the disclosed devices, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between devices or units, and may be electrical, mechanical, or other forms.

[0082] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0083] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0084] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0085] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

[0086] Although preferred embodiments have been described in this specification, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this specification.

[0087] Obviously, those skilled in the art can make various modifications and variations to this specification without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, this specification is also intended to include such modifications and variations.

Claims

1. A method for shifting gears in a hybrid vehicle, characterized in that, This invention relates to a hybrid power transmission system, which includes an engine, a generator, a drive motor, a planetary gear set, and a shift actuator. The planetary gear set includes a planet carrier, a sun gear shaft, and a ring gear shaft. The planet carrier is connected to the engine, and the sun gear shaft is connected to the generator. The gear shifting actuator is mounted on the gear ring shaft, and the gear shifting actuator has a neutral position, a first engaged position, and a second engaged position. The method includes: If the vehicle is in a parked state and the gear shifting actuator is in the neutral position, then it is determined whether the vehicle meets the conditions for parking and generating electricity based on the vehicle's battery charge. If the vehicle meets the parking power generation conditions, the shift actuator is controlled to switch from the neutral position to the first engagement position so that the vehicle can generate power while parked. If the vehicle does not meet the parking power generation conditions, the shift actuator is controlled to maintain the neutral position, and the vehicle is controlled to drive in pure electric mode. If the vehicle speed reaches a preset threshold during driving, the shift actuator is controlled to switch from the neutral position to the second engagement position.

2. The hybrid vehicle shift control method according to claim 1, characterized in that, The step of determining whether the vehicle meets the conditions for generating electricity while parked based on the vehicle's battery charge includes: If the battery charge is less than a preset safety threshold, then the vehicle is determined to meet the parking power generation conditions. If the battery charge is greater than or equal to the preset safety threshold, then the vehicle is determined not to meet the parking power generation conditions.

3. The hybrid vehicle shift control method according to claim 1, characterized in that, If the vehicle meets the parking power generation conditions, controlling the shift actuator to switch from the neutral position to the first engaged position includes: If the vehicle meets the parking power generation conditions, the generator is controlled to adjust the first speed difference between the shift actuator and the first engagement position to be less than the preset speed. Based on the first speed difference, the shift actuator is controlled to switch to the first engagement position, and the shift actuator is engaged with the first engagement position.

4. The hybrid vehicle shift control method according to claim 1, characterized in that, If the vehicle speed reaches a preset threshold during driving, controlling the shift actuator to switch from the neutral position to the second engagement position includes: If the vehicle speed reaches the preset threshold, the shift actuator is controlled to retract from the first engagement position to the neutral position; The generator is controlled to adjust the second speed difference between the shift actuator and the second engagement position to a preset range; Based on the second speed difference, the shift actuator is controlled to switch to the second engagement position, and the shift actuator is engaged with the second engagement position.

5. The hybrid vehicle shift control method according to claim 1, characterized in that, The shift actuator includes a left engagement tooth and a right engagement tooth; the hybrid transmission system also includes a direct drive gear and a housing; the left engagement tooth is disposed on the direct drive gear, and the right engagement tooth is disposed on the housing, wherein: The first engagement position is the position where the shift actuator engages with the left engagement tooth, and the second engagement position is the position where the shift actuator engages with the right engagement tooth.

6. The hybrid vehicle shift control method according to claim 5, characterized in that, The hybrid power transmission system further includes a differential and a one-way clutch, the one-way clutch being disposed between the direct drive gear and the differential, and the method further includes: If the shift actuator is in the second engaged position and the vehicle's wheel speed is greater than the speed of the direct drive gear, then the one-way clutch is controlled to disengage.

7. The hybrid vehicle shift control method according to claim 1, characterized in that, Also includes: If the vehicle is detected to be accelerating to overtake, the engine, generator, and drive motor are controlled to drive the vehicle simultaneously.

8. The hybrid vehicle shift control method according to claim 1, characterized in that, Also includes: During the process of controlling the shift actuator to switch gears, the engine is started and power is split through the planetary gear set.

9. The hybrid vehicle shift control method according to claim 1, characterized in that, Also includes: In the event of a failure of the drive motor, the shift actuator is controlled to switch from its current position to the second engagement position.

10. A shift control device for a hybrid vehicle, comprising: The memory and processor are characterized in that the processor is used to implement the steps of the hybrid vehicle shift control method as described in any one of claims 1 to 9 when executing a computer program stored in the memory.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the hybrid vehicle shift control method as described in any one of claims 1 to 9.

12. A hybrid power transmission system, characterized in that, Includes an engine, a generator, a drive motor, a planetary gear set, a shift actuator, and a hybrid vehicle shift control device according to claim 10, wherein: The planetary gear set includes a planet carrier, a sun gear shaft, and a ring gear shaft. The planet carrier is connected to the engine, and the sun gear shaft is connected to the generator. The gear shifting actuator is mounted on the gear ring shaft, and the gear shifting actuator has a neutral position, a first engagement position, and a second engagement position; The hybrid vehicle shift control device is connected to the shift actuator, the generator, and the drive motor, respectively.

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