A method and system for starting a series hybrid electric vehicle under full load conditions

Abstract

This invention relates to the field of hybrid vehicle power control technology, and discloses a full-load driving start method and system for a series hybrid vehicle. The full-load driving start method dynamically adjusts the power limit of the drive motor by obtaining the smaller of the maximum instantaneous available power of the battery and the current actual power of the drive motor. This ensures that the drive motor operates within the battery's power supply capacity, avoiding excessive battery discharge due to excessive drive motor power. It also compensates for insufficient drive motor power and torque drops caused by the starter motor occupying additional battery power during startup, thus preventing vehicle vibration issues. Simultaneously, it avoids unexpected acceleration problems caused by excessive maximum instantaneous available battery power. By calculating the torque limit of the drive motor based on its final power limit and adjusting its torque output, the method ensures that the vehicle maintains optimal energy utilization under various operating conditions.

Description

Technical Field

[0001] This invention belongs to the field of power control technology for hybrid vehicles, specifically relating to a method and system for starting a series hybrid vehicle under full load conditions. Background Technology

[0002] Existing series hybrid vehicle start-up methods primarily follow a strategy of starting the engine when the drive power approaches the maximum continuous drive power limit allowed by the battery. This method provides relatively stable power output under most normal driving conditions, ensuring the vehicle's operating efficiency under different driving conditions. In practice, the timing of engine start-up is closely related to the use of battery power, aiming to balance power demand and energy consumption.

[0003] However, this existing starting method has a significant problem: because the starter motor has a higher priority in power allocation than the drive motor, it consumes additional battery power during engine startup. This directly results in a reduction in the drive motor's power output. Specifically, when the battery needs to meet the power demands of both the starter and drive motors simultaneously, the starter motor, with its higher priority, will utilize the battery's power resources first, thus reducing the available power for the drive motor.

[0004] This imbalance in power distribution can trigger a series of drivability issues. Due to insufficient power in the drive motor, its torque output is affected, resulting in a so-called "torque dip." This manifests as a sudden drop in drive motor torque, leading to unstable drive motor speed and consequently causing noticeable shaking and impact on the vehicle upon startup. This not only affects driving comfort but may also pose a potential threat to the vehicle's overall performance and safety. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned problems and provide a method and system for starting a series hybrid vehicle under full load conditions. This solves the problem of insufficient short-term drive power during startup, which causes the drive motor torque to drop and the vehicle to vibrate and shake. It also avoids the problem of acceleration shock and vibration caused by the sudden upward change in drive motor torque due to excessively high maximum instantaneous available power of the battery.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a method for starting a series hybrid electric vehicle under full load conditions, comprising the following steps:

[0008] Obtain the battery's maximum instantaneous available power, the current actual power consumption of the drive motor, and the actual power consumption of the starter motor;

[0009] The remaining battery power is obtained based on the maximum instantaneous available power and the actual power consumed by the starter motor;

[0010] Compare the remaining battery power with the current actual power consumption of the drive motor, and take the smaller of the two as the final power limit of the drive motor;

[0011] Calculate the torque limit of the drive motor based on its final power limit, and adjust the torque output of the drive motor accordingly.

[0012] A further improvement of the present invention is that the specific method for taking the smaller of the two values ​​as the final power limit of the drive motor is as follows:

[0013] Calculate the actual power consumed by the starter motor, and subtract the actual power consumed by the starter motor from the maximum instantaneous available power of the battery to obtain the remaining power of the battery;

[0014] The remaining battery power is compared with the current actual power consumption of the drive motor, and the smaller of the two values ​​is taken as the final power limit of the drive motor.

[0015] A further improvement of the present invention is that it also includes the following steps: after the starter motor starts, the power distribution of the drive motor is dynamically adjusted according to the remaining power of the battery and the power demand of the drive motor.

[0016] A further improvement of the present invention is that, in the step of dynamically adjusting the power distribution of the drive motor, the remaining battery charge, temperature and the power demand of the drive motor are monitored, and the power distribution strategy is adjusted according to the monitoring results.

[0017] A further improvement of the present invention is that it also includes the following steps: during the start-up process of the starter motor, the instantaneous maximum available power of the battery is preferentially allocated to the starter motor, and the remaining power is used to drive the motor.

[0018] A further improvement of the present invention is that the calculation formula for the torque limit is: torque limit = 9550 * final power limit / motor speed.

[0019] Secondly, the present invention also provides a full-load driving start system for a series hybrid vehicle, comprising the following modules:

[0020] The power acquisition module is used to acquire the battery's maximum instantaneous available power, the current actual power consumption of the drive motor, and the actual power consumption of the starter motor;

[0021] The power calculation module is used to obtain the remaining battery power based on the maximum instantaneous available power and the actual power consumed by the starter motor;

[0022] The power comparison module is used to compare the remaining power of the battery with the current actual power consumed by the drive motor, and take the smaller value of the two as the final power limit of the drive motor.

[0023] The torque adjustment module calculates the torque limit of the drive motor based on the final power limit of the drive motor and adjusts the torque output of the drive motor.

[0024] A further improvement of the present invention is that it also includes a remaining power calculation module, which is used to calculate the actual power consumed by the starter motor and subtract the actual power consumed by the starter motor from the maximum instantaneous available power of the battery to obtain the remaining power;

[0025] The final power limiting module is used to compare the remaining power with the current actual power of the drive motor, and take the smaller value as the final power limit of the drive motor.

[0026] Thirdly, the present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the above-described series hybrid vehicle full-load driving start method.

[0027] Fourthly, the present invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the above-described series hybrid vehicle full-load driving start method.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] This invention dynamically adjusts the power limit of the drive motor by taking the smaller of the battery's maximum instantaneous available power and the drive motor's current actual power. This ensures that the drive motor operates within the battery's power supply capacity, preventing excessive battery discharge caused by excessive drive motor power. It also compensates for insufficient drive motor power and torque drops caused by the starter motor's additional use of battery power during startup, thus preventing vehicle vibration issues. Furthermore, it avoids unexpected acceleration problems caused by excessive battery maximum instantaneous available power. By calculating the drive motor's torque limit based on its final power limit and adjusting its torque output, the invention ensures optimal energy utilization under various operating conditions, extending battery range and reducing unnecessary energy consumption. Adjusting the drive motor's torque output also prevents damage due to overload, contributing to the stability and reliability of the drive system and improving overall vehicle performance. Attached Figure Description

[0030] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components of the invention.

[0031] Figure 1 This is a flowchart of the method of the present invention;

[0032] Figure 2 This is a system flowchart of the present invention;

[0033] Figure 3 This is a control flowchart of an embodiment of the present invention;

[0034] Figure 4 This is a system diagram of Embodiment 4 of the present invention. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0040] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0041] The present invention will now be described in further detail with reference to the accompanying drawings:

[0042] Example 1:

[0043] like Figure 1 As shown, a method for starting a series hybrid vehicle under full load conditions includes the following steps:

[0044] S1, obtain the maximum instantaneous available power of the battery, the current actual power consumption of the drive motor, and the actual power consumption of the starter motor;

[0045] S2, based on the maximum instantaneous available power and the actual power consumed by the starter motor, obtain the remaining battery power;

[0046] During the start-up process of the starter motor, the maximum instantaneous available power of the battery is allocated to the starter motor first, and the remaining power is used to drive the motor.

[0047] S3. Compare the remaining power of the battery with the current actual power consumed by the drive motor, and take the smaller value of the two as the final power limit of the drive motor.

[0048] S4, calculate the torque limit of the drive motor based on the final power limit of the drive motor, and adjust the torque output of the drive motor;

[0049] Furthermore, after the starter motor starts, the power distribution of the drive motor is dynamically adjusted according to the remaining power of the battery and the power demand of the drive motor. Specifically, the power distribution strategy is adjusted based on the monitoring results of the remaining battery power, temperature, and the power demand of the drive motor.

[0050] Furthermore, the formula for calculating the torque limit is: Torque limit = 9550 * final power limit / motor speed.

[0051] Example 2:

[0052] like Figure 2 As shown, a series hybrid vehicle full-load driving start system includes the following modules:

[0053] The power acquisition module is used to acquire the battery's maximum instantaneous available power, the current actual power consumption of the drive motor, and the actual power consumption of the starter motor;

[0054] The power calculation module is used to obtain the remaining battery power based on the maximum instantaneous available power and the actual power consumed by the starter motor;

[0055] The power comparison module is used to compare the remaining power of the battery with the current actual power consumed by the drive motor, and take the smaller value of the two as the final power limit of the drive motor.

[0056] The torque adjustment module calculates the torque limit of the drive motor based on the final power limit of the drive motor and adjusts the torque output of the drive motor.

[0057] Furthermore, it also includes a remaining power calculation module, which is used to calculate the actual power consumed by the starter motor and subtract the actual power consumed by the starter motor from the maximum instantaneous available power of the battery to obtain the remaining power;

[0058] The final power limiting module is used to compare the remaining power with the current actual power of the drive motor, and take the smaller value as the final power limit of the drive motor.

[0059] Example 3:

[0060] like Figure 3 As shown, a method for starting a series hybrid electric vehicle under full load conditions specifically includes:

[0061] Step S10: When the vehicle needs to be started, calculate the required power of the starter motor and determine whether the required power exceeds the maximum available power of the battery.

[0062] Step S20: If the power demand of the starter motor exceeds the maximum available power of the battery, then the power of the starter motor is limited to not exceed its maximum power.

[0063] Step S30: Calculate the power limit of the drive motor based on the difference between the maximum instantaneous available power of the battery and the actual power consumed by the starter motor, as well as the current actual power consumed by the drive motor, and take the smaller of the two as the final power limit of the drive motor.

[0064] Step S40: Calculate the power limit of the starter motor and take the smaller value between the requested power of the starter motor and the instantaneous maximum available power of the battery.

[0065] Step S50: Convert the power limit of the starter motor into a torque limit. The formula for calculating the torque limit is: Torque limit = 9550 * final power limit / motor speed;

[0066] In step S60, the hybrid power control unit (HCU) constrains the starting motor torque according to the calculated torque limit.

[0067] Step S70: The management system MS further constrains the torque of the starter motor according to the normal continuous available maximum power limit to ensure the safety and stability of the starting process;

[0068] Step S80: Start the engine to complete the vehicle starting process.

[0069] This invention provides a full-load driving start method for a series hybrid electric vehicle. By comprehensively considering the power demand of the starter motor, the maximum available power of the battery, and the maximum instantaneous available power of the battery, it effectively solves the driving performance problems such as vehicle vibration and impact caused by a sudden drop in wheel-end drive torque due to insufficient maximum continuous available power of the battery during the full-load driving start process of a series hybrid electric vehicle. Specifically, this invention limits the power of the starter motor to no more than the smaller value between its requested power and the battery's instantaneous maximum available power. The power limit of the drive motor is calculated based on the difference between the battery's maximum instantaneous available power and the actual power consumed by the starter motor, as well as the current actual power consumed by the drive motor. This avoids torque drops in the drive motor, ensures smooth torque changes, and improves the smoothness and comfort of the vehicle's driving experience. Furthermore, this invention converts the power limit into a torque limit through a torque limit calculation formula, thereby constraining the torque of the starter motor and further ensuring the safety and stability of the starting process.

[0070] Example 4:

[0071] Please see Figure 4 As shown, the present invention also provides an electronic device 100 for a full-load driving start method for a series hybrid vehicle; the electronic device 100 includes a memory 101, at least one processor 102, a computer program 103 stored in the memory 101 and executable on the at least one processor 102, and at least one communication bus 104.

[0072] The memory 101 can be used to store the computer program 103. The processor 102 implements the steps of the full-load driving start method for a series hybrid vehicle described in Embodiment 1 by running or executing the computer program stored in the memory 101 and calling the data stored in the memory 101. The memory 101 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, at least one application program required for a function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created according to the use of the electronic device 100 (such as audio data), etc. In addition, the memory 101 may include non-volatile memory, such as hard disk, memory, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, or other non-volatile solid-state storage device.

[0073] The at least one processor 102 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor 102 may be a microprocessor or any conventional processor. The processor 102 is the control center of the electronic device 100, connecting various parts of the electronic device 100 via various interfaces and lines.

[0074] The memory 101 in the electronic device 100 stores multiple instructions to implement a full-load driving start method for a series hybrid vehicle, and the processor 102 can execute the multiple instructions to achieve the following:

[0075] Obtain the battery's maximum instantaneous available power, the current actual power consumption of the drive motor, and the actual power consumption of the starter motor;

[0076] The remaining battery power is obtained based on the maximum instantaneous available power and the actual power consumed by the starter motor;

[0077] Compare the remaining battery power with the current actual power consumption of the drive motor, and take the smaller of the two as the final power limit of the drive motor;

[0078] Calculate the torque limit of the drive motor based on its final power limit, and adjust the torque output of the drive motor accordingly.

[0079] Example 5:

[0080] If the modules / units integrated in the electronic device 100 are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, and a read-only memory (ROM).

[0081] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0082] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0083] 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.

[0084] 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.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for starting a series hybrid electric vehicle under full load conditions, characterized in that, Includes the following steps: Obtain the battery's maximum instantaneous available power, the current actual power consumption of the drive motor, and the actual power consumption of the starter motor; The remaining battery power is obtained based on the maximum instantaneous available power and the actual power consumed by the starter motor; Compare the remaining battery power with the current actual power consumption of the drive motor, and take the smaller of the two as the final power limit of the drive motor; Calculate the torque limit of the drive motor based on the final power limit of the drive motor, and adjust the torque output of the drive motor accordingly; The specific method for taking the smaller of the two values ​​as the final power limit of the drive motor is as follows: Calculate the actual power consumed by the starter motor, and subtract the actual power consumed by the starter motor from the maximum instantaneous available power of the battery to obtain the remaining power of the battery; The remaining battery power is compared with the current actual power consumption of the drive motor, and the smaller of the two values ​​is taken as the final power limit of the drive motor.

2. The method for starting a series hybrid vehicle under full load conditions according to claim 1, characterized in that, It also includes the following steps: After the starter motor starts, the power distribution of the drive motor is dynamically adjusted according to the remaining power of the battery and the power demand of the drive motor.

3. The method for starting a series hybrid vehicle under full load conditions according to claim 2, characterized in that, In the step of dynamically adjusting the power distribution of the drive motor, the remaining battery charge, temperature, and the power demand of the drive motor are monitored, and the power distribution strategy is adjusted based on the monitoring results.

4. The method for starting a series hybrid vehicle under full load conditions according to claim 1, characterized in that, It also includes the following steps: During the start-up process, the maximum available instantaneous power of the battery is prioritized for the start-up motor, and the remaining power of the battery is used to drive the motor.

5. The method for starting a series hybrid vehicle under full load conditions according to claim 1, characterized in that, The formula for calculating the torque limit is: Torque limit = 9550 * final power limit / motor speed.

6. A full-load driving start system for a series hybrid vehicle, characterized in that, Includes the following modules: The power acquisition module is used to acquire the battery's maximum instantaneous available power, the current actual power consumption of the drive motor, and the actual power consumption of the starter motor; The power calculation module is used to obtain the remaining battery power based on the maximum instantaneous available power and the actual power consumed by the starter motor; The power comparison module is used to compare the remaining power of the battery with the current actual power consumed by the drive motor, and take the smaller value of the two as the final power limit of the drive motor. The torque adjustment module calculates the torque limit of the drive motor based on the final power limit of the drive motor and adjusts the torque output of the drive motor. The remaining power calculation module is used to calculate the actual power consumed by the starter motor and subtract the actual power consumed by the starter motor from the maximum instantaneous available power of the battery to obtain the remaining power of the battery. The final power limiting module is used to compare the remaining power of the battery with the current actual power of the drive motor, and take the smaller value as the final power limit of the drive motor.

7. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the full-load driving start method for a series hybrid vehicle as described in any one of claims 1 to 5.

8. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the full-load driving start method for a series hybrid vehicle as described in any one of claims 1 to 5.

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