Two-gear hybrid DHT gear shifting control method and device and medium

Abstract

The invention relates to a two-gear hybrid DHT gear shifting control method and device and a medium, and belongs to the technical field of hybrid automobiles. The method comprises the following steps: acquiring the real-time maximum charging power and the real-time maximum discharging power of a battery; calculating to obtain the current highest upshift speed Vu or the current highest downshift speed Vd; acquiring the peak charging power Pcp and the peak discharging power Pdp of the battery; calculating to obtain an upshift correction factor alpha and a downshift correction factor beta; a real-time gear shifting MAP is calculated; a gear shifting request and a torque request are sent; switching the torque to a requested value; and shifting the gear. The working reliability of the hybrid power system can be improved. The reliability of the battery is not sacrificed, and the gear shifting function can be achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of hybrid vehicles, and in particular relates to a two-speed hybrid DHT shift control method, device and medium. Background Art

[0002] The multi-gear hybrid DHT's multiple gears are generally arranged behind the engine, that is, the engine has a multi-gear driving function, and the drive motor has only one gear to drive the vehicle. The shift control method of the multi-gear hybrid DHT is generally based on the vehicle speed, throttle opening, or based on the vehicle speed, throttle opening, additional slope, vehicle weight, and vehicle condition. In addition, some two-gear hybrid DHTs have multiple gears arranged behind the drive motor, that is, the drive motor has the function of driving in two gears, and the engine has one gear. During the upshift process, the motor is reduced from a high speed to a low speed, and the excess power needs to be released. If the gear shift is completed in a short time, the excess power needs to be rushed into the power battery. During the downshift process, the motor is increased from a low speed to a high speed. If the gear shift is completed in a short time, power needs to be obtained from the power battery. Otherwise, the gear shift cannot be completed. The problem of matching the power of the power battery charging and discharging power with the power of the gear shift process is an important issue facing R&D personnel. Summary of the invention

[0003] The present disclosure proposes a two-speed hybrid DHT shift control method, device and medium to solve the above technical problems.

[0004] According to a first aspect of the present disclosure, a two-speed hybrid DHT shift control method is provided, the method comprising: obtaining a real-time maximum charging power of a battery and a real-time maximum discharging power of a battery; calculating a current maximum upshift vehicle speed V based on the real-time maximum charging power of the battery or the real-time maximum discharging power of the battery; u Or the current maximum downshift speed V d ; Obtain the peak charging power P_cp and peak discharging power P_dp of the battery; According to V u / P_cp and V d / P_dp, calculate the upshift correction factor α and the downshift correction factor β; multiply each upshift vehicle speed in the basic shift MAP by the α, and multiply each downshift vehicle speed by the β, to obtain the real-time shift MAP, wherein the basic shift MAP is formulated based on the vehicle speed and the throttle opening; send a shift request and a torque request according to the real-time shift MAP; switch the torque to the requested value based on the torque request; switch the gear according to the shift permission and the target gear.

[0005] In some embodiments, the basic shift MAP includes a maximum shift vehicle speed, which is calculated based on the peak charge and discharge power of the battery, the rotational inertia of the system, and the required shift time.

[0006] In some embodiments, the shift actuator controller switches the gear according to the shift permission and the target gear.

[0007] According to a second aspect of the present disclosure, a two-speed hybrid DHT shift control device is provided, comprising: a battery charging and discharging power acquisition module, used to acquire the real-time maximum charging power of the battery and the real-time maximum discharging power of the battery; a maximum upshift and downshift vehicle speed calculation module, used to calculate the current maximum upshift vehicle speed V based on the real-time maximum charging power of the battery or the real-time maximum discharging power of the battery. u Or the current maximum downshift speed V d ; Peak charging power acquisition module, used to obtain the peak charging power P_cp and peak discharge power P_dp of the battery; correction factor calculation module, used to calculate the peak charging power P_cp and peak discharge power P_dp according to V u / P_cp and V d / P_dp, calculates the upshift correction factor α and the downshift correction factor β; a real-time shift MAP calculation module, used to multiply each upshift vehicle speed in the basic shift MAP by the α, and multiply each downshift vehicle speed by the β, to obtain the real-time shift MAP, wherein the basic shift MAP is formulated based on the vehicle speed and the throttle opening; a request sending module, used to send a shift request and a torque request according to the real-time shift MAP; a torque switching module, used to switch the torque to the requested value based on the torque request; a gear switching module, used to switch the gear according to the shift permission and the target gear.

[0008] According to a third aspect of the present disclosure, a two-speed hybrid DHT shift control device is provided, comprising: a memory; and a processor coupled to the memory, the processor being configured to execute the two-speed hybrid DHT shift control method as described above based on instructions stored in the memory.

[0009] According to a fourth aspect of the present disclosure, a computer storable medium is provided, on which computer program instructions are stored, and when the instructions are executed by a processor, the two-speed hybrid DHT shift control method as described above is implemented.

[0010] Beneficial effects of the present disclosure: The present disclosure is relatively easy to implement, has a simple principle, can realize the gear shifting of the hybrid system, and can achieve the purpose of optimization through calibration, can improve the reliability of the hybrid system, and is easy to apply in the whole vehicle. The technical means does not sacrifice the reliability of the battery and can realize the gear shifting function. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0012] Figure 1is a flow chart showing a two-speed hybrid DHT shift control method according to some embodiments of the present disclosure.

[0013] Figure 2 is a diagram showing a hybrid system architecture according to some embodiments of the present disclosure.

[0014] Figure 3 is a diagram showing a basic shift MAP according to some embodiments of the present disclosure.

[0015] Figure 4 is a block diagram showing a two-speed hybrid DHT shift control device according to some embodiments of the present disclosure.

[0016] Figure 5 is a block diagram showing a two-speed hybrid DHT shift control device according to some other embodiments of the present disclosure.

[0017] Figure 6 is a block diagram illustrating a computer system for implementing some embodiments of the present disclosure. DETAILED DESCRIPTION

[0018] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure unless otherwise specifically stated.

[0019] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0020] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0021] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0022] The multi-speed hybrid DHT has multiple gears arranged behind the engine, that is, the engine has a multi-speed driving function, and the drive motor has only one gear for driving.

[0023] like Figure 2 As shown, the present disclosure relates to a shift control method for a two-speed hybrid DHT system. The multiple gears of the two-speed hybrid DHT are arranged behind the drive motor, that is, the drive motor has the function of driving in two gears, and the engine only has one gear.

[0024] During the upshift (1st gear to 2nd gear) process, the motor speed decreases from high speed (large kinetic energy) to low speed (small kinetic energy), and the excess power needs to be released. If you want to complete the gear shift in a short time, the power must be charged into the battery, otherwise the gear shift cannot be completed. The downshift process is the opposite of the above.

[0025] The charge and discharge performance of a battery is closely related to the SOC state (the amount of power a battery can use) and temperature. The lower the SOC and the lower the temperature, the lower the charge and discharge power of the battery.

[0026] At this time, shifting gears requires considering the battery SOC status, battery temperature and power level during shifting gears.

[0027] The gear shifting power is described as follows (for ease of understanding, taking upshifting as an example): when shifting from 1st gear to 2nd gear, since the vehicle speed will not change dramatically, the motor speed will drop from high speed (such as 10000rpm) to low speed (such as 5000rpm), and the entire speed regulation time is required to be less than △t. The angular acceleration * system moment of inertia * instantaneous speed in this process is the power during gear shifting.

[0028] Most of the shift control strategies are based on two parameters (vehicle speed, throttle opening) or multiple parameters (vehicle speed, throttle opening, one or two of the factors such as additional slope or vehicle weight or vehicle condition). The gear position is behind the engine, and there is no need to consider the problem of matching the battery charging and discharging power with the power of the shift process. The present disclosure aims to solve the problem of how to achieve shift control in a two-speed hybrid system. The present disclosure needs to decide how to shift according to the current vehicle status, battery temperature, battery SOC status, power size during shifting, etc.

[0029] The shift strategy disclosed in the present invention adds a correction factor θ based on two parameters (vehicle speed and throttle opening). On the one hand, the shifting of the hybrid system involved in the present invention can be realized, and on the other hand, the reliability of the battery can be protected from being reduced due to frequent use of peak charge and discharge power.

[0030] The correction factor needs to be confirmed based on the battery temperature, the battery SOC status, and the power level during gear shifting.

[0031] When the battery temperature is greater than T1 and less than T2, and the SOC is greater than a certain value, the real-time maximum charge and discharge power of the battery is equal to the peak charge and discharge power. When the battery temperature decreases or the SOC decreases, the real-time maximum charge and discharge power of the battery decreases accordingly.

[0032] The power during gear shifting must be less than the peak charge and discharge power of the battery (how much less depends on the battery capacity) to ensure normal gear shifting. The maximum upshift speed can be calculated based on the peak charge and discharge power. The maximum upshift speed is Vcp (corresponding to the peak charge power P_cp), and the maximum downshift speed is Vdp (corresponding to the peak discharge power P_dp). After the maximum upshift speed is determined, other shift points are achieved through calibration.

[0033] Taking upshift as an example, when the upshift power P_U is greater than the battery's real-time maximum charging power P_cm, the excess power cannot be transferred in a short time and the gear shift cannot be achieved. u It should be calculated based on the real-time maximum charging power P_cm of the battery. The correction factor θ is (θ=V u / Vcp). At this time, all upshift vehicle speed points in the shift MAP need to be multiplied by the correction factor θ. Similarly, the correction factor for downshifting can be calculated.

[0034] like Figure 2 As shown, the engine can be directly connected to the differential drive wheel through the ring gear of the planetary gear set. At this time, the P1 motor is used to adjust the engine speed so that it works in the high-efficiency zone. When the engine is stopped, the P3 motor directly drives and connects the differential drive wheel through the 2nd gear reducer. Pure electric two-speed driving is achieved.

[0035] like Figure 1 As shown, the two-speed hybrid DHT shift control method includes steps 110 to 180.

[0036] In step 110, the real-time maximum charging power and the real-time maximum discharging power of the battery are obtained.

[0037] The drive motor has a two-speed driving function; the engine has a single-speed direct drive function. At the same time, the generator regulates the engine speed through a planetary gear set.

[0038] For the vehicle equipped with a two-speed hybrid DHT system, a two-parameter basic shift MAP based on vehicle speed and throttle opening is formulated. The highest shift speed point in the shift MAP is calculated based on the peak charge and discharge power of the battery, the system's moment of inertia, and the required shift time. The angular acceleration*system moment of inertia*instantaneous speed in this process is the power during the shift.

[0039] In step 120, based on the real-time maximum charging power of the battery or the real-time maximum discharging power of the battery, the current maximum upshift vehicle speed V is calculated. u Or the current maximum downshift speed V d .

[0040] The vehicle controller receives the battery status in real time and sends the battery's real-time maximum charge and discharge power to the shift controller TCU. The TCU calculates the maximum upshift (downshift) vehicle speed V in the current state based on the battery's real-time maximum charge (discharge) power. u (V d ), and then calculate the upshift correction factor θ (θ=V u / Vcp, the downshift correction factor β can be calculated in the same way (β=V d / Vdp).

[0041] In step 130 , the peak charging power P_cp and the peak discharging power P_dp of the battery are obtained.

[0042] In step 140, according to V u / P_cp and V d / P_dp, the upshift correction factor α and the downshift correction factor β are calculated.

[0043] In step 150 , each upshift vehicle speed in the basic shift MAP is multiplied by the α, and each downshift vehicle speed is multiplied by the β to obtain a real-time shift MAP, wherein the basic shift MAP is formulated based on the vehicle speed and the throttle opening.

[0044] like Figure 3 As shown, all upshift vehicle speed points in the basic shift MAP are multiplied by the correction factor θ, and all downshift vehicle speed points are multiplied by the correction factor β to obtain the real-time shift MAP.

[0045] At step 160 , shift requests and torque requests are issued based on the immediate shift MAP.

[0046] At step 170 , based on the torque request, the torque is switched to a requested value.

[0047] In step 180 , the gear is switched according to the gear shift permission and the target gear.

[0048] At this time, the TCU (shift controller) will send a shift request and a torque request according to the real-time shift MAP. After receiving the torque request, the motor controller MCU will reduce the torque of the motor to the requested value. Then the shift actuator controller ACU will shift the gear to N gear according to the shift permission and the target gear. Then the motor controller switches to the speed control mode and sends a target speed control request. When the motor speed reaches the requested target speed, the ACU (shift actuator controller) controls the shift actuator to engage the target gear. Then exit the speed control mode, switch to the torque control mode, and load according to the torque request of the vehicle controller VCU. This completes the entire shift process.

[0049] like Figure 4As shown, the two-speed hybrid DHT shift control device 400 includes a battery charging and discharging power acquisition module 410, a maximum up / down gear vehicle speed calculation module 420, a peak charging power acquisition module 430, a correction factor calculation module 440, a real-time shift MAP calculation module 450, a request sending module 460, a torque switching module 470, and a gear switching module 480.

[0050] The battery charging and discharging power acquisition module 410 is used to obtain the real-time maximum charging power and the real-time maximum discharging power of the battery;

[0051] The maximum upshift speed calculation module 420 is used to calculate the current maximum upshift speed V based on the real-time maximum charging power of the battery or the real-time maximum discharging power of the battery. u Or the current maximum downshift speed V d ;

[0052] The peak charging power acquisition module 430 is used to acquire the peak charging power P_cp and the peak discharging power P_dp of the battery;

[0053] The correction factor calculation module 440 is used to calculate the correction factor according to V u / P_cp and V d / P_dp, calculate the upshift correction factor α and downshift correction factor β;

[0054] A real-time shift MAP calculation module 450 is used to multiply each upshift vehicle speed in the basic shift MAP by the α, and multiply each downshift vehicle speed by the β, to obtain a real-time shift MAP, wherein the basic shift MAP is formulated based on the vehicle speed and the throttle opening;

[0055] A request sending module 460, configured to send a shift request and a torque request according to the real-time shift MAP;

[0056] A torque switching module 470, configured to switch the torque to a requested value based on the torque request;

[0057] The gear switching module 480 is used to switch the gear according to the gear shift permission and the target gear.

[0058] In the device of the embodiment of the present disclosure, the present disclosure is relatively easy to implement, the principle is simple, and the gear shifting of the hybrid system can be realized. The optimization purpose can be achieved through calibration, and the reliability of the hybrid system can be improved. The present technical means does not sacrifice the reliability of the battery and can realize the gear shifting function.

[0059] like Figure 5As shown, the two-speed hybrid DHT shift control device 500 includes a memory 510; and a processor 520 coupled to the memory 510. The memory 510 is used to store instructions for executing the corresponding embodiments of the two-speed hybrid DHT shift control method. The processor 520 is configured to execute the two-speed hybrid DHT shift control method in any of some embodiments of the present disclosure based on the instructions stored in the memory 510.

[0060] like Figure 6 As shown, computer system 600 may be embodied in the form of a general purpose computing device. Computer system 600 includes memory 610, processor 620, and bus 630 that connects various system components.

[0061] The memory 610 may include, for example, a system memory, a non-volatile storage medium, etc. The system memory may store, for example, an operating system, an application, a boot loader, and other programs. The system memory may include a volatile storage medium, such as a random access memory (RAM) and / or a cache memory. The non-volatile storage medium may store, for example, instructions for executing at least one of the corresponding embodiments of the two-speed hybrid DHT shift control method. The non-volatile storage medium includes, but is not limited to, a disk memory, an optical memory, a flash memory, and the like.

[0062] The processor 620 can be implemented by a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistors, and other discrete hardware components. Accordingly, each module can be implemented by a central processing unit (CPU) running instructions in a memory that execute corresponding steps, or by a dedicated circuit that executes corresponding steps.

[0063] The bus 630 may use any of a variety of bus architectures, including, but not limited to, an Industry Standard Architecture (ISA) bus, a Micro Channel Architecture (MCA) bus, and a Peripheral Component Interconnect (PCI) bus.

[0064] The computer system 600 may also include an input / output interface 640, a network interface 650, a storage interface 660, etc. These interfaces 640, 650, 660, the memory 610, and the processor 620 may be connected via a bus 630. The input / output interface 640 may provide a connection interface for input / output devices such as a display, a mouse, and a keyboard. The network interface 650 may provide a connection interface for various networked devices. The storage interface 660 may provide a connection interface for external storage devices such as a floppy disk, a USB flash drive, and an SD card.

[0065] Here, various aspects of the present disclosure are described with reference to flowcharts and / or block diagrams of methods, devices, and computer program products according to embodiments of the present disclosure. It should be understood that each frame of the flowchart and / or block diagram and the combination of frames can be implemented by computer-readable program instructions.

[0066] These computer-readable program instructions may be provided to a processor of a general-purpose computer, a special-purpose computer or other programmable device to produce a machine, so that the processor executes the instructions to produce means for implementing the functions specified in one or more blocks in the flowchart and / or block diagram.

[0067] These computer-readable program instructions may also be stored in a computer-readable memory, which cause the computer to work in a specific manner to produce an article of manufacture, including instructions for implementing the functions specified in one or more blocks in the flowchart and / or block diagram.

[0068] The present disclosure can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects.

[0069] The present invention is easy to implement, has a simple principle, can realize the gear shifting of the hybrid system, and can achieve the purpose of optimization through calibration, can improve the reliability of the hybrid system, and is easy to apply in the whole vehicle. The technical means does not sacrifice the reliability of the battery and can realize the gear shifting function.

[0070] So far, the two-speed hybrid DHT shift control method, device and medium according to the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0071] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A two-speed hybrid DHT shift control method, characterized in that: The method comprises: Obtain the real-time maximum charging power and the real-time maximum discharging power of the battery; Based on the real-time maximum charging power of the battery or the real-time maximum discharging power of the battery, the current maximum upshift vehicle speed V is calculated. u Or the current maximum downshift speed V d ; Obtain the peak charging power P_cp and peak discharging power P_dp of the battery; According to V u / P_cp and V d / P_dp, calculate the upshift correction factor α and downshift correction factor β; Multiply each upshift vehicle speed in the basic shift MAP by the α, and multiply each downshift vehicle speed by the β, to obtain a real-time shift MAP, wherein the basic shift MAP is formulated based on the vehicle speed and the throttle opening; sending a shift request and a torque request according to the real-time shift MAP; Based on the torque request, switching the torque to a requested value; The gear is changed according to the gear shift permission and the target gear.

2. The two-speed hybrid DHT shift control method according to claim 1, characterized in that: The basic shift MAP includes a maximum shift vehicle speed, which is calculated based on the peak charge and discharge power of the battery, the rotational inertia of the system, and the required shift time.

3. The two-speed hybrid DHT shift control method according to claim 1, characterized in that: The shift actuator controller changes the gear according to the shift permission and the target gear.

4. A two-speed hybrid DHT shift control device, characterized in that: include: The battery charging and discharging power acquisition module is used to obtain the real-time maximum charging power and the real-time maximum discharging power of the battery; The maximum upshift speed calculation module is used to calculate the current maximum upshift speed V based on the real-time maximum charging power of the battery or the real-time maximum discharging power of the battery. u Or the current maximum downshift speed V d ; A peak charging power acquisition module is used to obtain the peak charging power P_cp and peak discharging power P_dp of the battery; Correction factor calculation module, used to calculate the V u / P_cp and V d / P_dp, calculate the upshift correction factor α and downshift correction factor β; A real-time shift MAP calculation module, used for multiplying each upshift vehicle speed in the basic shift MAP by the α, and multiplying each downshift vehicle speed by the β, to obtain a real-time shift MAP, wherein the basic shift MAP is formulated based on the vehicle speed and the throttle opening; a request sending module, configured to send a shift request and a torque request according to the real-time shift MAP; a torque switching module, configured to switch the torque to a requested value based on the torque request; The gear switching module is used to switch the gear according to the gear shift permission and the target gear.

5. A two-speed hybrid DHT shift control device, characterized in that: include: Memory; as well as A processor coupled to the memory, the processor being configured to execute the two-speed hybrid DHT shift control method according to any one of claims 1 to 3 based on instructions stored in the memory.

6. A computer storable medium, characterized in that: Computer program instructions are stored thereon, and when the instructions are executed by a processor, a two-speed hybrid DHT shift control method as described in any one of claims 1 to 3 is implemented.

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