Two-gear hybrid dht gear shifting control method, device and medium

Abstract

The present disclosure relates to a two-gear hybrid DHT gear shifting control method, device and medium, belonging to the technical field of hybrid vehicles. The method comprises: obtaining the real-time maximum charging power of the battery and the real-time maximum discharging power of the battery; calculating the current highest upshift speed V u or the current highest downshift speed V d ; obtaining the peak charging power P_cp and the peak discharging power P_dp of the battery; calculating the upshift correction factor θ and the downshift correction factor β; calculating the real-time gear shifting MAP; sending the gear shifting request and the torque request; switching the torque to the requested value; and switching the gear. The present disclosure can improve the reliability of the hybrid system. The present disclosure does not sacrifice the reliability of the battery and can realize the gear shifting function.

Description

TECHNICAL FIELD

[0001] The present disclosure belongs to the technical field of hybrid vehicles, and particularly relates to a two-gear hybrid DHT gear shifting control method, device and medium. BACKGROUND

[0002] The multiple gears of the hybrid DHT are generally arranged behind the engine, that is, the engine has a multiple-gear driving function, and the driving motor has only one gear driving. The gear shifting control method of the multiple-gear hybrid DHT is generally based on vehicle speed, throttle opening, or based on vehicle speed, throttle opening, additional slope, vehicle weight and vehicle condition. In addition, the multiple gears of some two-gear hybrid DHTs are arranged behind the driving motor, that is, the driving motor has a two-gear driving function, and the engine has one gear working. In the process of gear upshift, the motor is reduced from high speed to low speed, and the excess power needs to be released. If the gear shifting is completed in a short time, the excess power needs to be rushed into the power battery. In the process of gear downshift, the motor is increased from low speed to high speed, and if the gear shifting is completed in a short time, the power needs to be obtained from the power battery. Otherwise, the gear shifting cannot be completed. The power matching between the power battery charging and discharging power and the gear shifting process is an important issue for researchers. SUMMARY

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

[0004] According to a first aspect of the present disclosure, a two-gear hybrid DHT gear shifting control method is provided, which comprises: obtaining a real-time maximum charging power of a battery and a real-time maximum discharging power of the battery; calculating a current highest upshift speed V u or a current highest downshift speed V d based on the real-time maximum charging power of the battery or the real-time maximum discharging power of the battery; obtaining a peak charging power P_cp and a peak discharging power P_dp of the battery; and obtaining a highest upshift speed Vcp corresponding to the peak charging power P_cp and a highest downshift speed Vdp corresponding to the peak discharging power P_dp; calculating an upshift correction factor θ and a downshift correction factor β according to V u / Vcp and V d / Vdp; multiplying each upshift speed in a basic gear shifting MAP by the θ and multiplying each downshift speed by the β to obtain a real-time gear shifting MAP, wherein the basic gear shifting MAP is formulated based on vehicle speed and throttle opening; sending a gear shifting request and a torque request according to the real-time gear shifting MAP; switching torque to a requested value based on the torque request; and switching gears according to gear shifting permission and a target gear.

[0005] In some embodiments, the base shift map includes a highest shift speed, which is calculated based on a peak charge-discharge power of the battery, a moment of inertia of the system, and a 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-gear hybrid DHT shift control device is provided, comprising: a battery charge-discharge power acquisition module, configured to acquire a real-time maximum charging power of a battery and a real-time maximum discharging power of the battery; a highest upshift speed calculation module, configured to calculate a current highest upshift speed V u or a current highest downshift speed V d based on the real-time maximum charging power of the battery or the real-time maximum discharging power of the battery; a peak charging power acquisition module, configured to acquire a peak charging power P_cp and a peak discharging power P_dp of the battery; and a highest upshift speed Vcp corresponding to the peak charging power P_cp and a highest downshift speed Vdp corresponding to the peak discharging power P_dp; a correction factor calculation module, configured to calculate an upshift correction factor θ and a downshift correction factor β according to V u / Vcp and V d / Vdp; a real-time shift map calculation module, configured to multiply each upshift speed in a base shift map by the θ and each downshift speed by the β to obtain a real-time shift map, wherein the base shift map is formulated based on a vehicle speed and an accelerator opening degree; 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; and a gear switching module, configured to switch the gear according to a shift permission and a target gear.

[0008] According to a third aspect of the present disclosure, a two-gear hybrid DHT shift control device is provided, comprising: a memory; and a processor coupled to the memory, configured to execute a two-gear 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 storage medium is provided, having computer program instructions stored thereon, which, when executed by a processor, implement a two-gear hybrid DHT shift control method as described above.

[0010] The present disclosure has the advantages of easy implementation, simple principle, ability to realize shift of a hybrid system, and ability to achieve optimization through calibration, thereby improving the reliability of the hybrid system in operation and facilitating application in a whole vehicle. The technical means does not sacrifice the reliability of the battery and can realize the shift function. BRIEF DESCRIPTION OF DRAWINGS

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

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

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

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

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

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

[0017] Figure 6 is a block diagram of 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 the components and steps set forth in these embodiments, numerical expressions, and numerical values, unless specifically stated otherwise, do not limit the scope of the present disclosure.

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

[0020] Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered as part of the specification, where appropriate.

[0021] In all of the examples shown and discussed herein, any specific values should be interpreted as merely exemplary, and not as a limitation. Thus, other examples of the exemplary embodiments can have different values.

[0022] The multiple gears of the hybrid DHT are arranged behind the engine, i.e., the engine has a multi-gear driving function, and the driving motor has only one gear driving function.

[0023] As Figure 2The present disclosure relates to a shift control method of a two-gear hybrid DHT system. The multi-gear of the two-gear hybrid DHT is arranged behind the drive motor, i.e. the drive motor has the function of two-gear driving, and the engine only has one gear working.

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

[0025] The charging and discharging performance of the battery is closely related to the SOC state (the amount of electricity that the battery can use) and the temperature. The lower the SOC, the lower the temperature, and the lower the charging and discharging power of the battery.

[0026] At this time, the shift needs to consider the SOC state of the battery, the battery temperature and the power size at the time of shift.

[0027] The shift power is described as follows (for easy understanding, taking upshift as an example): When 1st gear is upshifted to 2nd gear, the motor speed is reduced from high speed (such as 10000 rpm) to low speed (such as 5000 rpm) due to the fact that the vehicle speed will not change sharply, and the entire speed regulation time is required to be less than △t. The angular acceleration * system moment of inertia * instantaneous speed during this process is the power at the time of shift.

[0028] The shift control strategy is mostly based on two parameters (vehicle speed, throttle opening) or multiple parameters (vehicle speed, throttle opening, additional slope or vehicle weight or vehicle condition, one or two of the above factors), and the gear is behind the engine, so there is no need to consider the matching of battery charging and discharging power and shift power. The problem to be solved by the present disclosure is how to realize the shift control of the two-gear hybrid system. The present disclosure needs to determine how to shift according to the current vehicle state, battery temperature, battery SOC state, and power size at the time of shift.

[0029] The shift strategy of the present disclosure adds a correction factor θ on the basis of two parameters (vehicle speed, throttle opening). On the one hand, it can realize the shift of the hybrid system involved in the present disclosure, and on the other hand, it can protect the battery from the reliability decline caused by frequent use of peak charging and discharging power.

[0030] The confirmation of the correction factor needs to be confirmed according to the battery temperature, the SOC state of the battery, and the power size at the time of shift.

[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 charging and discharging power of the battery is equal to the peak charging and discharging power. When the battery temperature decreases or the SOC decreases, the real-time maximum charging and discharging power of the battery decreases.

[0032] The power during gear shifting is less than the peak charging and discharging power of the battery (specifically how much less, which needs to be defined according to the battery capacity), so as to ensure normal gear shifting. The highest upshift speed and the highest downshift speed can be calculated according to the peak charging and discharging power. After the highest upshift speed and the highest downshift speed are determined, other gear shifting points are realized through calibration.

[0033] Taking upshift as an example, when the upshift power P U is greater than the real-time maximum charging power P cm of the battery, the excess power cannot be transferred in a short time, and gear shifting cannot be realized. At this time, the maximum upshift speed V u should be calculated according to the real-time maximum charging power P cm of the battery. The correction factor θ is (θ = V u / V cp). At this time, all upshift speed points in the gear shifting MAP need to be multiplied by the correction factor θ. Similarly, the correction factor during downshift can be calculated.

[0034] As shown in FIG. 1, Figure 2 The engine can be directly connected to the differential through the ring gear of the planetary gear set to drive the wheels. At this time, the P1 motor is used to adjust the engine speed to work in the high-efficiency zone. When the engine is stopped, the P3 motor directly drives the wheels through the 2-gear reducer connected to the differential to realize pure electric two-gear driving.

[0035] As shown in FIG. 2, Figure 1 the two-gear hybrid DHT gear shifting control method includes steps 110 to 180.

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

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

[0038] For a vehicle equipped with a two-gear hybrid DHT system, a two-parameter basic gear shifting MAP based on vehicle speed and accelerator opening degree is developed, wherein the highest gear shifting speed point in the gear shifting MAP is calculated according to the peak charging and discharging power of the battery, the system moment of inertia and the required gear shifting time. The angular acceleration * system moment of inertia * instantaneous speed in this process is the power during gear shifting.

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

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

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

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

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

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

[0045] In step 160, the shift request and the torque request are sent according to the real-time shift MAP.

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

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

[0048] At this time, the TCU (shift controller) sends the shift request and the torque request according to the real-time shift MAP, and the motor controller MCU reduces the torque of the motor to the requested value after receiving the torque request. Then the shift actuator controller ACU switches the gear to the N gear according to the shift permission and the target gear. Then the motor controller switches to the speed control mode and sends the 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 the speed control mode is exited and the torque control mode is switched to, and the torque is loaded according to the torque request of the whole vehicle controller VCU. Thus the whole shift process is completed.

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

[0050] The battery charge and discharge power acquisition module 410 is configured to acquire a real-time maximum charge power of the battery and a real-time maximum discharge power of the battery.

[0051] The maximum upshift gear vehicle speed calculation module 420 is configured to calculate a current maximum upshift gear vehicle speed V u or a current maximum downshift gear vehicle speed V d based on the real-time maximum charge power of the battery or the real-time maximum discharge power of the battery.

[0052] The peak charge power acquisition module 430 is configured to acquire a peak charge power P_cp and a peak discharge power P_dp of the battery.

[0053] The correction factor calculation module 440 is configured to calculate an upshift correction factor a and a downshift correction factor b according to V u / P_cp and V d / P_dp.

[0054] The real-time gear shifting MAP calculation module 450 is configured to multiply each upshift gear vehicle speed in a basic gear shifting MAP by the a and each downshift gear vehicle speed by the b to obtain a real-time gear shifting MAP, wherein the basic gear shifting MAP is formulated based on vehicle speed and accelerator opening degree.

[0055] The request sending module 460 is configured to send a gear shifting request and a torque request according to the real-time gear shifting MAP.

[0056] The torque switching module 470 is configured to switch torque to a requested value based on the torque request.

[0057] The gear switching module 480 is configured to switch gears according to a gear shifting permission and a target gear.

[0058] In the device of the embodiments of the present disclosure, the present disclosure is easy to implement, the principle is simple, the gear shifting of the hybrid system can be achieved, and the optimization purpose can be achieved through calibration, the reliability of the hybrid system in operation can be improved, and the device is easy to apply in a whole vehicle. The technical means does not sacrifice the reliability of the battery and can achieve the gear shifting function.

[0059] As Figure 5As shown, a 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 configured 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 according to any of the 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 implemented as a general-purpose computing device. Computer system 600 includes memory 610, processor 620, and bus 630 that connects various system components.

[0061] Memory 610 may include, for example, system memory, non-volatile storage media, and the like. System memory, for example, stores an operating system, application programs, a boot loader, and other programs. System memory may include volatile storage media, such as random access memory (RAM) and / or cache memory. Non-volatile storage media, for example, stores instructions for executing at least one embodiment of the two-speed hybrid DHT shift control method. Non-volatile storage media include, but are not limited to, disk storage, optical storage, and flash memory.

[0062] The processor 620 can be implemented using 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, or discrete hardware components such as discrete gates or transistors. Accordingly, each module can be implemented by a central processing unit (CPU) executing instructions in memory that execute corresponding steps, or by dedicated circuits that execute corresponding steps.

[0063] The bus 630 may utilize 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] Computer system 600 may also include input / output interfaces 640, a network interface 650, a storage interface 660, and the like. These interfaces 640, 650, and 660, as well as memory 610 and processor 620, may be connected via bus 630. Input / output interfaces 640 provide connection interfaces for input / output devices such as a display, mouse, and keyboard. Network interface 650 provides a connection interface for various networked devices. Storage interface 660 provides a connection interface for external storage devices such as floppy disks, USB flash drives, and SD cards.

[0065] The computer readable program instructions can also be loaded onto a computer, other programmable apparatus, or other device to cause a series of operations to be performed on the computer, other programmable apparatus, or other device to produce a computer implemented process, such that the instructions which execute on the computer, other programmable apparatus, or other device implement the functions specified in the flowchart and / or block diagram block or blocks.

[0066] These computer readable program instructions can be provided to a processor of a general purpose computer, special purpose computer, or other programmable apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable apparatus, create means for implementing the functions specified in the flowchart and / or block diagram block or blocks.

[0067] These computer readable program instructions can also be stored in a computer readable storage medium that can direct a computer, a programmable apparatus, or other devices to function in a particular manner, such that the instructions stored in the computer readable storage medium produce an article of manufacture including instructions which implement the function specified in the flowchart and / or block diagram block or blocks.

[0068] The computer readable program instructions can also be loaded onto a computer, other programmable apparatus, or other device to cause a series of operations to be performed on the computer, other programmable apparatus, or other device to produce a computer implemented process, such that the instructions which execute on the computer, other programmable apparatus, or other device implement the functions specified in the flowchart and / or block diagram block or blocks.

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

[0070] Thus far, the two-gear hybrid DHT gear shifting 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. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein according to the above description.

[0071] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, and are not intended to limit the scope of the present disclosure. Those skilled in the art should understand that the above embodiments can 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; The current maximum upshift speed V is calculated based on the real-time maximum charging power of the battery u , the current maximum downshift speed V is calculated based on the real-time maximum discharge power of the battery d ; Obtain the peak charging power P_cp and peak discharging power P_dp of the battery; and obtain the maximum upshift vehicle speed Vcp corresponding to the peak charging power P_cp, and obtain the maximum downshift vehicle speed Vdp corresponding to the peak discharging power P_dp; According to V u / Vcp is used to calculate the upshift correction factor θ, and the d / Vdp is used to calculate the downshift correction factor β; Multiplying each upshift vehicle speed in the basic shift MAP by the θ 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; sending a shift request and a torque request according to the real-time shift map; switching the torque to a requested value based on the torque request; The gear is changed according to the 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: Battery charge and discharge power acquisition module, 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. u , the current maximum downshift speed V is calculated based on the real-time maximum discharge power of the battery 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; and to obtain the maximum upshift vehicle speed Vcp corresponding to the peak charging power P_cp, and to obtain the maximum downshift vehicle speed Vdp corresponding to the peak discharging power P_dp; Correction factor calculation module, used to calculate the V u / Vcp is used to calculate the upshift correction factor θ, and the d / Vdp is used to calculate the downshift correction factor β; a real-time shift MAP calculation module, configured to multiply each upshift vehicle speed in a basic shift MAP by the θ and 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 shift module is used to shift 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, the two-speed hybrid DHT shift control method according to any one of claims 1 to 3 is implemented.

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