A method and system for improving the power performance of a vehicle in an ECVT mode with low battery

Abstract

The embodiment provides a low-battery performance vehicle power improvement method and system in an ECVT mode, and relates to the technical field of vehicle power control. The method first calculates the maximum available power of an engine based on the vehicle power balance principle, then obtains the maximum available power generation of a P1 generator in combination with planetary gear set motion and a kinematic equation, further determines the maximum power generation of the P1 generator by fusing the actual power of a P3 drive motor and the maximum charging power of a battery, and finally calculates the maximum drive torque of the engine and the P3 drive motor to a wheel end respectively and comprehensively obtains the maximum drive torque of the wheel end of the vehicle through the Newton iteration algorithm and the planetary gear set dynamics relationship. The application breaks the vicious cycle of power torque limit, fully releases the engine torque capacity, improves the vehicle driving ability and power performance in the ECVT mode under the low battery performance, and maximizes the advantages of the ECVT power split hybrid configuration.

Description

Technical Field

[0001] This invention relates to the field of vehicle power control technology, and in particular to a method and system for improving the overall vehicle power performance under low battery performance in ECVT mode. Background Technology

[0002] With the development of new energy vehicle technology, multi-speed hybrid transmissions integrating ECVT (Electric Continuously Variable Transmission) power-split mode are widely used in PHEV models due to their advantages such as superior power performance and low fuel consumption. The core configuration of this type of transmission is as follows: the engine flywheel is connected to the planetary carrier of a single planetary gear set; the P1 generator is coaxially connected to the S2 synchronizer hub and sun gear; the ring gear is connected to the wheels via the left and right sides of the S1 synchronizer, respectively, to two sets of gear trains with different speed ratios, a differential, and half-shafts; the P3 drive motor is also connected to the wheels via a differential and half-shafts to another set of gear trains. When the S2 synchronizer is in the middle position and the left / right sides of the S1 synchronizer are engaged, two ECVT gears with different speed ratios are formed. Based on the kinematic characteristics of a single planetary gear set, in ECVT gears, engine speed and wheel speed are decoupled, while engine torque and wheel torque are not decoupled. Engine torque can be split, with one part directly transmitted to the wheel ends via the ring gear, and the other part driving the P1 generator to generate electricity, forming the ECVT power-split mode.

[0003] However, in practical applications, when PHEV models equipped with the aforementioned multi-speed hybrid electric drive are driving in ECVT power split mode, the wheel-end driving capability of the entire vehicle will be severely limited if they encounter low battery performance conditions (such as low temperature conditions) where both battery charging / discharging power is low. The reason for this is that the wheel-end driving force comes from two parts: the direct torque transmission from the engine and the drive from the P3 drive motor. The engine's output torque is limited by the maximum charging torque of the P1 motor, which in turn is limited by the maximum charging power of the P1 motor. At the same time, the maximum charging power of the P1 motor also depends on the actual positive power of the P3 motor, and the driving power of the P3 motor comes from the maximum discharge power of the battery and the actual charging power of the P1 motor, which further depends on the engine's output torque / power, forming a cyclical relationship between power and torque limits.

[0004] In existing technologies, the power and torque algorithm logic of different actuators in a vehicle power controller is distributed across different software modules, and the module scheduling follows a fixed order. This causes the aforementioned cyclical correlation of power and torque limits to evolve into a vicious cycle: under low battery performance, the maximum charging power of the P1 motor cannot be further increased, resulting in a strict limitation on the engine's output torque / power. Consequently, the driving power of the P3 motor is also limited, ultimately leading to insufficient wheel-end driving capability. The engine's power capability cannot be fully utilized, the vehicle's acceleration performance is limited, and the core advantages of the ECVT power-split mode cannot be realized. Therefore, it is urgent to design a targeted control strategy to break the vicious cycle of power and torque limits, fully release the engine's power capability under low battery performance conditions, and improve the overall vehicle dynamics of the ECVT mode. Summary of the Invention

[0005] This invention aims to solve at least one of the technical problems existing in the prior art, and proposes a method and system for improving the overall vehicle power performance under low battery performance in ECVT mode.

[0006] In a first aspect, embodiments of the present invention provide a method for improving the overall vehicle power performance under low battery performance in ECVT mode, including:

[0007] Based on the principle of vehicle power balance and the limitations of the engine's own external characteristics, the maximum available power of the engine is calculated.

[0008] The maximum available power of generator P1 is calculated based on the engine’s maximum available power and the target engine speed.

[0009] The actual maximum power output of generator P1 is calculated based on the maximum available power output of generator P1 and the actual power consumed by drive motor P3.

[0010] Based on the actual maximum power output of the P1 generator, calculate the maximum drive torque from the engine to the wheel end in ECVT mode; based on the maximum available drive power of the P3 drive motor, calculate the maximum drive torque from the P3 drive motor to the wheel end at the current P3 drive motor speed; based on the maximum drive torque from the engine and the P3 drive motor to the wheel end, obtain the maximum drive torque of the entire vehicle wheel end in ECVT mode.

[0011] Furthermore, based on the principle of vehicle power balance and the limitations of the engine's own external characteristics, the maximum usable power of the engine is calculated. The specific method includes: subtracting the maximum discharge power of the battery from the sum of the power required by the driver and the power consumed by vehicle accessories to obtain the basic power that the engine needs to provide, and then determining the maximum usable power of the engine by combining the limitations of the engine's own external characteristics.

[0012] Furthermore, based on the engine's maximum available power and the target engine speed, the maximum available generating power of the P1 generator is calculated. Specifically, this includes: calculating the engine's maximum available torque in ECVT mode based on the obtained maximum available power and target engine speed; solving for the target P1 generator's maximum negative torque to meet the driver's driving needs based on the planetary gear set dynamics equations; determining the planetary gear set ring speed based on the current vehicle speed and calculating the target P1 generator speed under the current operating conditions using the planetary gear set kinematic equations; and calculating the maximum available generating power of the P1 generator based on the target P1 generator's maximum negative torque and target P1 generator speed.

[0013] Furthermore, based on the maximum available generating power of generator P1 and the actual power consumed by drive motor P3, the actual maximum generating power of generator P1 is calculated. The specific method includes: inverting the actual positive power consumed by drive motor P3 and taking the minimum value with the obtained maximum available generating power of generator P1, adding the maximum charging power of battery to obtain the basic generating power, and combining the power limitation of generator P1's external characteristics to determine the maximum generating power of generator P1.

[0014] Furthermore, after inverting the actual positive power consumed by the P3 drive motor, the minimum value is obtained by taking the minimum value between the P3 drive motor and the P1 generator's maximum available power. The specific implementation method includes: taking the negative value of the actual positive power of the P3 drive motor to obtain the P3 drive motor power compensation value, and taking the smaller value between the compensation value and the P1 generator's maximum available power as the core limit value of the P1 generator's power.

[0015] Furthermore, based on the actual maximum power output of the P1 generator, the maximum driving torque from the engine to the wheel end in ECVT mode is calculated. The specific method includes: based on the quadratic equation of motor torque and power, the maximum power output torque of the P1 generator at the current P1 generator speed is calculated using the Newton iteration algorithm; based on the planetary gear set dynamics, the maximum engine torque is solved from the maximum power output torque of the P1 generator, and the maximum driving torque from the engine to the wheel end in ECVT mode is calculated.

[0016] Furthermore, based on the maximum available drive power of the P3 drive motor, the maximum drive torque from the P3 drive motor to the wheel end at the current P3 drive motor speed is calculated. The specific method includes: summing the actual power generated by the P1 generator with the maximum discharge power of the battery to obtain the maximum available drive power of the P3 drive motor, and calculating the maximum drive torque from the P3 drive motor to the wheel end at the current P3 drive motor speed based on the maximum available drive power of the P3 drive motor.

[0017] Furthermore, the method is applied to vehicles equipped with multi-speed hybrid transmissions that integrate ECVT power split mode. In the multi-speed hybrid transmission that integrates ECVT power split mode, the engine flywheel is connected to the planet carrier of a single planetary gear set, the P1 generator is coaxially connected to the S2 synchronizer hub and the sun gear, the ring gear is connected to the wheel via the S1 synchronizer, the gear system, the differential, and the half-shaft, and the P3 drive motor is connected to the wheel via another set of gear systems, the differential, and the half-shaft. When the S2 synchronizer is in the middle position and the left / right side of the S1 synchronizer is engaged, ECVT gears with different speed ratios are formed.

[0018] Furthermore, the formula for the planetary dynamics equations is as follows: ;in: Where P1 is the motor speed, and K is the planetary gear set characteristic parameter. The rotational speed of the gear ring is... The engine speed is given; the gear ring speed and the wheel speed are in a fixed proportional relationship.

[0019] Furthermore, the formula for the kinematic equations of the planetary displacement is as follows: =1:K: (1+K); where, For the sun gear torque, For gear ring torque, Where is the planetary carrier torque, and K is the planetary gear set characteristic parameter; when the engine torque is input to the planetary carrier, the engine torque Te = -(1+K)×TP1, where Te is the engine torque and TP1 is the P1 motor torque.

[0020] Secondly, this invention also discloses a vehicle power performance enhancement system for low battery performance in ECVT mode, comprising: an engine maximum available power calculation unit, a P1 generator maximum available power calculation unit, a P1 generator actual maximum power calculation unit, and a vehicle wheel-end maximum drive torque calculation unit; wherein:

[0021] The engine's maximum available power calculation unit is used to calculate the engine's maximum available power based on the vehicle power balance principle and the engine's own external characteristic limitations.

[0022] The P1 generator maximum available power generation calculation unit is used to calculate the P1 generator maximum available power generation based on the engine maximum available power and the target engine speed.

[0023] The P1 generator actual maximum power generation calculation unit is used to calculate the actual maximum power generation of the P1 generator based on the available maximum power generation of the P1 generator and the actual power consumed by the P3 drive motor.

[0024] The whole vehicle wheel-end maximum drive torque calculation unit is used to calculate the maximum drive torque from the engine to the wheel end in ECVT mode based on the actual maximum power output of the P1 generator; to calculate the maximum drive torque from the P3 drive motor to the wheel end at the current P3 drive motor speed based on the maximum available drive power of the P3 drive motor; and to obtain the whole vehicle wheel-end maximum drive torque in ECVT mode based on the maximum drive torque from the engine and the P3 drive motor to the wheel end.

[0025] Thirdly, the present invention also discloses an electronic device, comprising:

[0026] One or more processors;

[0027] Memory, used to store one or more programs;

[0028] When the one or more programs are executed by the one or more processors, the one or more processors implement the method.

[0029] This invention provides a method and system for improving vehicle power performance under low battery performance in ECVT mode. It addresses the technical problem of PHEV models equipped with multi-speed hybrid electric drive systems, where a vicious cycle of power and torque limitations prevents the engine from fully utilizing its capabilities and restricts wheel-end drive performance under ECVT power-split mode and low battery performance conditions. The method first calculates the maximum usable engine power based on the vehicle power balance principle. Then, it combines planetary gearing and kinematic equations to obtain the maximum usable generator power of generator P1. Further, it integrates the actual power of drive motor P3 and the maximum charging power of the battery to determine the maximum generator power of generator P1. Finally, using Newton's iterative algorithm and planetary gearing dynamics, it calculates the maximum drive torque from the engine and drive motor P3 to the wheels, and synthesizes the maximum wheel-end drive torque of the entire vehicle. This invention breaks the vicious cycle of power and torque limitations, fully releases the engine's torque capacity, improves the vehicle's drive performance and power performance in ECVT mode under low battery performance, and maximizes the advantages of the ECVT power-split hybrid configuration.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. Based on the principle of vehicle power balance and planetary gearing and kinematic characteristics, this invention starts from the driver's power requirements and derives the maximum available power of the engine, the maximum power output of the P1 generator, and the maximum driving torque at the wheel ends step by step. This breaks the vicious cycle of power and torque limits in the prior art and solves the problem of engine capacity being limited under low battery performance conditions from the root, thus fully releasing the engine's torque and power capabilities.

[0032] When calculating the maximum power output of the P1 generator, this invention integrates the actual power output of the P3 drive motor, the maximum charging power of the battery, and the external characteristic limitations of the P1 generator itself, so that the power output of the P1 generator matches the actual driving requirements of the vehicle, ensuring both power performance and safe operation of system components.

[0033] This invention uses Newton's iterative algorithm to calculate the maximum torque of the motor, adapting to the nonlinear characteristics of motor power-torque-speed, with high calculation accuracy and good real-time performance, which can meet the dynamic requirements of vehicle power control; at the same time, it integrates the driving torque from the engine and P3 drive motor to the wheel end, maximizing the wheel end drive potential of ECVT power split mode. Attached Figure Description

[0034] Figure 1 This is a flowchart illustrating a method for improving vehicle power performance under low battery performance in ECVT mode, provided by an embodiment of the present invention.

[0035] Figure 2 This is a structural diagram of a multi-speed hybrid transmission that integrates ECVT power split mode, as provided in the embodiments of the present invention.

[0036] Figure 3 This is a schematic diagram of the overall control algorithm logic for the maximum power output of generator P1 provided in an embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram of the logic for calculating the maximum driving torque at the wheel end provided in an embodiment of the present invention;

[0038] Figure 5 This is a structural block diagram of a vehicle power performance enhancement system with low battery performance in ECVT mode, provided by an embodiment of the present invention.

[0039] Figure 6 This is a structural block diagram of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0040] To enable those skilled in the art to better understand the technical solutions of the present invention, exemplary embodiments of the present invention are described below in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to aid understanding. These should be considered merely exemplary. Therefore, those skilled in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0041] Where there is no conflict, the various embodiments of the present invention and the features thereof may be combined with each other.

[0042] As used herein, the term “and / or” includes any and all combinations of one or more related enumerated entries.

[0043] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used herein, the singular forms “a” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that when the terms “comprising” and / or “made of” are used in this specification, the presence of the stated feature, integral, step, operation, element, and / or component is specified, but the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof is not excluded. Terms such as “connected” or “linked” are not limited to physical or mechanical connections but can include electrical connections, whether direct or indirect.

[0044] Unless otherwise specified, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having the meaning consistent with their meaning in the context of the relevant art and the invention, and will not be interpreted as having an idealized or overly formal meaning unless expressly so defined herein.

[0045] In the technical solution of this invention, the collection, storage, use, processing, transmission, provision, and disclosure of user personal information all comply with relevant laws and regulations and do not violate public order and good morals. The use of user data in this technical solution follows relevant national laws and regulations (e.g., the "Information Security Technology - Personal Information Security Specification"). For example: appropriate measures are taken for personal information access control; restrictions are imposed on the display of personal information; the purpose of using personal information does not exceed the scope of direct or reasonable association; and explicit identity targeting is eliminated when using personal information to avoid precisely locating a specific individual.

[0046] To address at least one of the technical problems existing in the aforementioned related technologies, the present invention provides a method and system for improving vehicle power performance under low battery performance in ECVT mode.

[0047] This implementation discloses a method for improving the overall vehicle power performance in ECVT mode when the battery performance is low, such as Figure 1 ,include:

[0048] S100. Calculate the maximum available power of the engine based on the vehicle power balance principle and the engine's own external characteristic capabilities. In this embodiment, the calculation of the maximum available power of the engine is based on the vehicle power balance principle and the engine's own external characteristic capabilities. The specific method includes: subtracting the maximum discharge power of the battery from the sum of the driver's required power and the power consumed by vehicle accessories to obtain the basic power that the engine needs to provide, and determining the maximum available power of the engine by combining the engine's own external characteristic capabilities.

[0049] Specifically, to better understand this implementation, such as Figure 2 The aforementioned power enhancement method is applied to vehicles equipped with a multi-speed hybrid transmission that integrates ECVT power split mode. In the multi-speed hybrid transmission that integrates ECVT power split mode, the engine flywheel is connected to the planet carrier of a single planetary gear set, the P1 generator is coaxially connected to the S2 synchronizer hub and the sun gear, the ring gear is connected to the wheel via the S1 synchronizer, the gear system, the differential, and the half-shaft, and the P3 drive motor is connected to the wheel via another set of gear systems, the differential, and the half-shaft. When the S2 synchronizer is in the middle position and the left / right side of the S1 synchronizer is engaged, ECVT gears with different speed ratios are formed.

[0050] In this embodiment, according to the principle of vehicle power balance, the power required by the driver and the power consumed by vehicle accessories to drive the vehicle are provided by the power battery and the engine. Therefore, the sum of the power required by the driver and the power consumed by the accessories, excluding the maximum discharge power of the battery, is the maximum power that the engine can provide for the vehicle, while taking into account the limitations of the engine's own external characteristics.

[0051] S200. Calculate the maximum available power output of the P1 generator based on the engine's maximum available power and the target engine speed. In this embodiment, the calculation of the maximum available power output of the P1 generator based on the engine's maximum available power and the target engine speed includes the following methods: calculating the maximum available torque of the engine in ECVT mode based on the obtained maximum available power and target engine speed; solving for the target P1 generator's maximum negative torque that meets the driver's driving needs based on the planetary gear set dynamics equations; determining the planetary gear set ring speed based on the current vehicle speed and calculating the target P1 generator speed under the current operating condition based on the planetary gear set kinematic equations; and calculating the maximum available power output of the P1 generator based on the target P1 generator's maximum negative torque and target P1 generator speed.

[0052] Specifically, based on the maximum available generating power of generator P1 and the actual power consumed by drive motor P3, the actual maximum generating power of generator P1 is calculated. The specific method includes: inverting the actual positive power consumed by drive motor P3 and taking the minimum value with the obtained maximum available generating power of generator P1, and adding the maximum charging power of battery to obtain the basic generating power. Combined with the power limitation of generator P1's external characteristics, the maximum generating power of generator P1 is determined.

[0053] In this embodiment, the formula for the planetary dynamics equation is: ;in: Where P1 is the motor speed, and K is the planetary gear set characteristic parameter. The rotational speed of the gear ring is... The engine speed is given; the gear ring speed and the wheel speed are in a fixed proportional relationship. The formula for the kinematic equations of the planetary gear set is: =1:K: (1+K); where, For the sun gear torque, For gear ring torque, Where is the planetary carrier torque, and K is the planetary gear set characteristic parameter; when the engine torque is input to the planetary carrier, the engine torque Te = -(1+K)×TP1, where Te is the engine torque and TP1 is the P1 motor torque.

[0054] S300. Calculate the actual maximum power output of generator P1 based on the maximum available power output of generator P1 and the actual power consumed by drive motor P3. In this embodiment, the calculation of the actual maximum power output of generator P1 based on the maximum available power output of generator P1 and the actual power consumed by drive motor P3 includes the following method: invert the actual positive power consumed by drive motor P3, take the minimum value with the obtained maximum available power output of generator P1, add the maximum charging power of battery to obtain the basic power output, and combine the power output limitation of generator P1 to determine the maximum power output of generator P1.

[0055] Specifically, such as Figure 3 According to the hybrid system configuration principle, in ECVT mode, the P1 generator can directly power the P3 drive motor and charge the battery. Therefore, the maximum power output of the P1 generator can be obtained by inverting the actual positive power consumed by the P3 drive motor and subtracting it from the calculated maximum power output of the P1 generator, and then adding it to the maximum charging power of the battery. At the same time, the power limitation of the P1 generator's external characteristics must be considered.

[0056] S400. Based on the actual maximum power output of generator P1, calculate the maximum drive torque from the engine to the wheel end in ECVT mode; based on the maximum available drive power of drive motor P3, calculate the maximum drive torque from drive motor P3 to the wheel end at the current speed of drive motor P3; based on the maximum drive torque from the engine and drive motor P3 to the wheel end, obtain the maximum drive torque of the entire vehicle wheel end in ECVT mode.

[0057] In this embodiment, the maximum driving torque from the engine to the wheel end in ECVT mode is calculated based on the actual maximum power output of the P1 generator. The specific method includes: using the quadratic equation of motor torque and power, Newton's iterative algorithm is used to calculate the maximum power output torque of the P1 generator at the current P1 generator speed; based on the planetary gear set dynamics, the maximum engine torque is solved from the maximum power output torque of the P1 generator, and the maximum driving torque from the engine to the wheel end in ECVT mode is calculated.

[0058] In this embodiment, the maximum driving torque from the P3 drive motor to the wheel end at the current P3 drive motor speed is calculated based on the maximum available driving power of the P3 drive motor. The specific method includes: summing the actual power generated by the P1 generator with the maximum discharge power of the battery to obtain the maximum available driving power of the P3 drive motor, and calculating the maximum driving torque from the P3 drive motor to the wheel end at the current P3 drive motor speed based on the maximum available driving power of the P3 drive motor.

[0059] This embodiment provides a method and system for improving vehicle power performance under low battery performance in ECVT mode, solving the technical problem of limited engine capacity and wheel-end drive capability caused by a vicious cycle of power and torque limitations in PHEV models equipped with multi-speed hybrid electric drive systems under ECVT power split mode and low battery performance conditions. The method first calculates the maximum available engine power based on the vehicle power balance principle, then obtains the maximum available generator power of P1 generator by combining planetary gear set and kinematic equations. Further, it integrates the actual power of P3 drive motor and the maximum charging power of the battery to determine the maximum generator power of P1 generator. Finally, it calculates the maximum drive torque from the engine and P3 drive motor to the wheels using Newton's iterative algorithm and planetary gear set dynamics, and then synthesizes the maximum wheel-end drive torque of the entire vehicle. This invention breaks the vicious cycle of power and torque limitations, fully releases the engine torque capability, improves the vehicle's drive capability and power performance in ECVT mode under low battery performance, and maximizes the advantages of the ECVT power split hybrid configuration.

[0060] Based on the same inventive concept, embodiments of the present invention also provide a system for improving vehicle power performance under low battery performance in ECVT mode. The above method is a method for improving vehicle power performance under low battery performance in ECVT mode, such as... Figure 5It includes: a calculation unit for the engine's maximum available power, a calculation unit for the P1 generator's maximum available generating power, a calculation unit for the P1 generator's actual maximum generating power, and a calculation unit for the maximum driving torque at the wheel end of the entire vehicle; wherein:

[0061] The engine's maximum available power calculation unit is used to calculate the engine's maximum available power based on the vehicle power balance principle and the engine's own external characteristic limitations.

[0062] The P1 generator maximum available power generation calculation unit is used to calculate the P1 generator maximum available power generation based on the engine maximum available power and the target engine speed.

[0063] The P1 generator actual maximum power generation calculation unit is used to calculate the actual maximum power generation of the P1 generator based on the available maximum power generation of the P1 generator and the actual power consumed by the P3 drive motor.

[0064] The whole vehicle wheel-end maximum drive torque calculation unit is used to calculate the maximum drive torque from the engine to the wheel end in ECVT mode based on the actual maximum power output of the P1 generator; to calculate the maximum drive torque from the P3 drive motor to the wheel end at the current P3 drive motor speed based on the maximum available drive power of the P3 drive motor; and to obtain the whole vehicle wheel-end maximum drive torque in ECVT mode based on the maximum drive torque from the engine and the P3 drive motor to the wheel end.

[0065] The specific working methods of the engine's maximum available power calculation unit, the P1 generator's maximum available power generation calculation unit, the P1 generator's actual maximum power generation calculation unit, and the whole vehicle wheel's maximum driving torque calculation unit have been described in detail in the above-mentioned power improvement method, and will not be repeated here in this embodiment.

[0066] Based on the same inventive concept, embodiments of the present invention also provide an electronic device. Figure 6 This is a structural block diagram of an electronic device provided in an embodiment of the present invention. Figure 6 As shown, an embodiment of the present invention provides an electronic device including: one or more processors 101, a memory 102, and one or more I / O interfaces 103. The memory 102 stores one or more programs, which, when executed by the one or more processors, cause the one or more processors to implement any of the performance enhancement methods described in the above embodiments; the one or more I / O interfaces 103 are connected between the processor and the memory, configured to enable information interaction between the processor and the memory.

[0067] The processor 101 is a device with data processing capabilities, including but not limited to a central processing unit (CPU); the memory 102 is a device with data storage capabilities, including but not limited to random access memory (RAM, more specifically SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), and flash memory (FLASH); the I / O interface (read / write interface) 103 is connected between the processor 101 and the memory 102, and can realize information interaction between the processor 101 and the memory 102, including but not limited to a data bus (Bus).

[0068] In some embodiments, the processor 101, memory 102, and I / O interface 103 are interconnected via bus 104, and thus connected to other components of the computing device.

[0069] In some embodiments, the one or more processors 101 include a field-programmable gate array.

[0070] This invention also provides a computer-readable medium. The computer-readable medium stores a computer program, which, when executed by a processor, implements the steps of any of the power enhancement methods described in the above embodiments. The computer-readable storage medium may be a volatile or non-volatile computer-readable storage medium.

[0071] This invention also provides a computer program product, including computer-readable code, or a non-volatile computer-readable storage medium carrying computer-readable code. When the computer-readable code is run in the processor of an electronic device, the processor in the electronic device executes the above-described power enhancement method.

[0072] Those skilled in the art will understand that all or some of the steps, systems, and apparatuses disclosed above, and their functional modules / units, can be implemented as software, firmware, hardware, or suitable combinations thereof. In hardware implementations, the division between functional modules / units mentioned above does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed collaboratively by several physical components. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit (ASIC). Such software can be distributed on a computer-readable storage medium, which may include computer storage media (or non-transitory media) and communication media (or transient media).

[0073] As is known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable program instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), static random access memory (SRAM), flash memory or other memory technologies, portable compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, it is known to those skilled in the art that communication media typically contain computer-readable program instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0074] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0075] The computer program instructions used to perform the operations of this invention may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing state information from the computer-readable program instructions. This electronic circuitry can execute the computer-readable program instructions to implement various aspects of the invention.

[0076] The computer program product described herein can be implemented specifically through hardware, software, or a combination thereof. In one alternative embodiment, the computer program product is specifically embodied in a computer storage medium; in another alternative embodiment, the computer program product is specifically embodied in a software product, such as a software development kit (SDK), etc.

[0077] Various aspects of the present invention are described herein with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should 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-readable program instructions.

[0078] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that, when executed by the processor of the computer or other programmable data processing apparatus, they create means for implementing the functions / actions specified in one or more blocks of the flowchart and / or block diagram. These computer-readable program instructions can also be stored in a computer-readable storage medium that causes a computer, programmable data processing apparatus, and / or other device to operate in a particular manner; thus, the computer-readable medium storing the instructions comprises an article of manufacture that includes instructions for implementing aspects of the functions / actions specified in one or more blocks of the flowchart and / or block diagram.

[0079] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions executed on the computer, other programmable data processing apparatus, or other device to perform the functions / actions specified in one or more boxes of a flowchart and / or block diagram.

[0080] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of an instruction, which contains one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than those shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0081] Example embodiments have been disclosed herein, and while specific terminology has been used, it is for illustrative purposes only and should be construed as such, and is not intended to be limiting. In some instances, it will be apparent to those skilled in the art that features, characteristics, and / or elements described in conjunction with particular embodiments may be used alone, or in combination with features, characteristics, and / or elements described in conjunction with other embodiments, unless otherwise expressly indicated. Therefore, those skilled in the art will understand that various changes in form and detail may be made without departing from the scope of the invention as set forth in the appended claims.

Claims

1. A method for improving vehicle power performance under low battery performance in ECVT mode, characterized in that, include: Based on the principle of vehicle power balance and the limitations of the engine's own external characteristics, the maximum available power of the engine is calculated. The maximum available power of generator P1 is calculated based on the engine’s maximum available power and the target engine speed. The actual maximum power output of generator P1 is calculated based on the maximum available power output of generator P1 and the actual power consumed by drive motor P3. Calculate the maximum drive torque from the engine to the wheel end in ECVT mode based on the actual maximum power output of generator P1; Based on the maximum available drive power of the P3 drive motor, calculate the maximum drive torque from the P3 drive motor to the wheel end at the current speed of the P3 drive motor. The maximum drive torque at the wheel ends of the entire vehicle in ECVT mode is obtained based on the maximum drive torque from the engine and P3 drive motor to the wheel ends.

2. The method according to claim 1, characterized in that, Based on the principle of vehicle power balance and the limitations of the engine's own external characteristics, the maximum usable power of the engine is calculated. The specific method includes: subtracting the maximum discharge power of the battery from the sum of the power required by the driver and the power consumed by the vehicle accessories to obtain the basic power that the engine needs to provide. Combined with the limitations of the engine's own external characteristics, the maximum usable power of the engine is determined.

3. The method according to claim 1, characterized in that, The maximum available power of the P1 generator is calculated based on the engine's maximum available power and the target engine speed. The specific method includes: calculating the engine's maximum available torque in ECVT mode based on the obtained maximum available power and target engine speed; solving for the target P1 generator's maximum negative torque to meet the driver's driving needs based on the planetary gear set dynamics equations; determining the planetary gear set ring speed based on the current vehicle speed and calculating the target P1 generator speed under the current operating conditions using the planetary gear set kinematic equations; and calculating the maximum available power of the P1 generator based on the target P1 generator's maximum negative torque and target P1 generator speed.

4. The method according to claim 1, characterized in that, Based on the maximum available generating power of generator P1 and the actual power consumed by drive motor P3, the actual maximum generating power of generator P1 is calculated. The specific method includes: inverting the actual positive power consumed by drive motor P3 and taking the minimum value with the obtained maximum available generating power of generator P1, and adding the maximum charging power of battery to obtain the basic generating power. Combined with the power limitation of generator P1's external characteristics, the maximum generating power of generator P1 is determined.

5. The method according to claim 4, characterized in that, After inverting the actual positive power consumed by the P3 drive motor, the minimum value is obtained by taking the minimum value between the P3 drive motor and the P1 generator's maximum available power. The specific implementation method includes: taking the negative value of the actual positive power of the P3 drive motor to obtain the P3 drive motor power compensation value, and taking the smaller value between the compensation value and the P1 generator's maximum available power as the core limit value of the P1 generator's power.

6. The method according to claim 1, characterized in that, Based on the actual maximum power output of the P1 generator, the maximum driving torque from the engine to the wheel end in ECVT mode is calculated. The specific method includes: based on the quadratic relationship between motor torque and power, Newton's iterative algorithm is used to calculate the maximum power output torque of the P1 generator at the current P1 generator speed; based on the planetary gear set dynamics, the maximum engine torque is solved from the maximum power output torque of the P1 generator, and the maximum driving torque from the engine to the wheel end in ECVT mode is calculated.

7. The method according to claim 1, characterized in that, Based on the maximum available drive power of the P3 drive motor, calculate the maximum drive torque from the P3 drive motor to the wheel end at the current P3 drive motor speed. The specific method includes: summing the actual power generated by the P1 generator with the maximum discharge power of the battery to obtain the maximum available drive power of the P3 drive motor, and then calculating the maximum drive torque from the P3 drive motor to the wheel end at the current P3 drive motor speed based on the maximum available drive power of the P3 drive motor.

8. The method according to claim 1, characterized in that, The method is applied to vehicles equipped with a multi-speed hybrid transmission with integrated ECVT power split mode. In the multi-speed hybrid transmission with integrated ECVT power split mode, the engine flywheel is connected to the planet carrier of a single planetary gear set, the P1 generator is coaxially connected to the S2 synchronizer hub and the sun gear, the ring gear is connected to the wheel via the S1 synchronizer, the gear system, the differential, and the half-shaft, and the P3 drive motor is connected to the wheel via another set of gear system, the differential, and the half-shaft. When the S2 synchronizer is in the middle position and the left / right side of the S1 synchronizer is engaged, ECVT gears with different speed ratios are formed.

9. The method according to claim 3, characterized in that, The formula for the planetary dynamics equation is: ;in: Where P1 is the motor speed, and K is the planetary gear set characteristic parameter. The rotational speed of the gear ring is... The engine speed is given; the gear ring speed and the wheel speed are in a fixed proportional relationship.

10. The method according to claim 3, characterized in that, The formula for the kinematic equations of the planetary displacement is: =1:K: (1+K); where, For the sun gear torque, For gear ring torque, Where is the planetary carrier torque, and K is the planetary gear set characteristic parameter; when the engine torque is input to the planetary carrier, the engine torque Te = -(1+K)×TP1, where Te is the engine torque and TP1 is the P1 motor torque.

11. A system for improving vehicle dynamics in ECVT mode with low battery performance, employing the method of any one of claims 1-9, characterized in that, include: The calculation units include: engine maximum available power calculation unit, P1 generator maximum available generating power calculation unit, P1 generator actual maximum generating power calculation unit, and wheel-end maximum drive torque calculation unit; among which: The engine's maximum available power calculation unit is used to calculate the engine's maximum available power based on the vehicle power balance principle and the engine's own external characteristic limitations. The P1 generator maximum available power generation calculation unit is used to calculate the P1 generator maximum available power generation based on the engine maximum available power and the target engine speed. The P1 generator actual maximum power generation calculation unit is used to calculate the actual maximum power generation of the P1 generator based on the available maximum power generation of the P1 generator and the actual power consumed by the P3 drive motor. The whole vehicle wheel-end maximum drive torque calculation unit is used to calculate the maximum drive torque from the engine to the wheel end in ECVT mode based on the actual maximum power output of the P1 generator; to calculate the maximum drive torque from the P3 drive motor to the wheel end at the current P3 drive motor speed based on the maximum available drive power of the P3 drive motor; and to obtain the whole vehicle wheel-end maximum drive torque in ECVT mode based on the maximum drive torque from the engine and the P3 drive motor to the wheel end.

12. An electronic device, characterized in that, include: One or more processors; Memory, used to store one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the method as described in any one of claims 1 to 10.

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