Control Method, Device and Electronic Equipment for Mode Switching of Parallel Hybrid Vehicle

Abstract

The present application provides a control method, device, and electronic device for mode switching of a parallel hybrid vehicle. The method includes: for the case where the vehicle is not in the gear shifting process, by increasing the motor output torque multiple times, dragging the engine speed to a difference less than a preset speed difference from the current motor speed to achieve switching the parallel hybrid vehicle from the pure electric mode to the hybrid mode; for the case where the vehicle is in the gear shifting process, when the gear selection is completed and the parallel hybrid vehicle has a gear engagement requirement, controlling the motor to drag the engine and simultaneously increasing the engine fuel injection volume to adjust the engine speed to a difference less than a preset speed difference from the current motor speed to achieve switching the parallel hybrid vehicle from the pure electric mode to the hybrid mode. The torque setting logic in this solution for the non-gear shifting process can meet the comfort requirements during vehicle driving, and the motor dragging the engine and simultaneously increasing the engine fuel injection volume during the gear shifting process shortens the vehicle power interruption time.

Description

Technical Field

[0001] The present application relates to the field of hybrid vehicles, and more particularly, to a control method, device, computer-readable storage medium, and electronic device for switching the operating mode of a parallel hybrid vehicle. Background Art

[0002] A parallel hybrid vehicle is a hybrid vehicle that combines an internal combustion engine (usually a diesel engine) and an electric motor as power sources to drive the vehicle. The internal combustion engine and the electric motor are connected in parallel mechanically (such as through gears and drive shafts) and can directly or indirectly drive the wheels. According to the driving conditions and the battery charge, the control system determines when to use the internal combustion engine, the electric motor, or both simultaneously.

[0003] When switching the parallel hybrid vehicle from the pure electric mode to the hybrid mode, 1) if not in the gear shifting process, the motor engages the clutch to tow, and the motor outputs a fixed torque to tow the vehicle; 2) if in the gear shifting process, first release the current gear, the motor first drags the engine to the target speed through the clutch, and finally shift into a new gear again to continue driving.

[0004] For the case of switching without gear shifting, the torque of the motor driving the vehicle decreases, resulting in a decrease in the vehicle speed and poor comfort during the vehicle driving; for the case of switching during gear shifting, since the motor drags the engine for a long time, the vehicle power interruption time is long. Summary of the Invention

[0005] The main objective of the present application is to provide a control method, device, computer-readable storage medium, and electronic device for switching the operating mode of a parallel hybrid vehicle, so as to at least solve the problems of a decrease in the vehicle speed and a long vehicle power interruption time when the parallel hybrid vehicle is switched from the pure electric mode to the hybrid mode in the prior art.

[0006] To achieve the above object, according to the first aspect of the present application, a control method for mode switching of a parallel hybrid vehicle is provided, including: if not in a gear shifting process, obtaining the current motor speed and the current motor torque, adjusting the motor output torque to be equal to the sum of the current motor torque and the first motor torque for dragging the engine to drag the engine speed to a preset speed. After the engine oil pressure rises with time and rises to the preset engine oil pressure, adjusting the motor output torque to be equal to the sum of the current motor torque and the second motor torque for dragging the engine, so as to drag the engine speed to a difference less than a preset speed difference from the current motor speed to realize switching the parallel hybrid vehicle from the pure electric mode to the hybrid mode, where the preset speed is less than the current motor speed and greater than the engine fuel injection speed, the first motor torque for dragging the engine is related to the preset speed, and the second motor torque for dragging the engine is related to the current motor speed; if in a gear shifting process, when the gear selection is completed and the parallel hybrid vehicle has a gear engagement requirement, controlling the motor to drag the engine and simultaneously increasing the engine fuel injection amount to adjust the engine speed to a difference less than the preset speed difference from the current motor speed to realize switching the parallel hybrid vehicle from the pure electric mode to the hybrid mode.

[0007] Optionally, the method further includes: using the first formula T1 = (T f1 +T r +T e1 ) / μ1 to determine the first motor torque for dragging the engine; using the second formula T2 = (T f2 +T r +T e2 ) / μ2 to determine the second motor torque for dragging the engine; where T1 and T2 respectively represent the first motor torque for dragging the engine and the second motor torque for dragging the engine, T f1 and T f2 respectively represent the first torque for overcoming engine friction and the second torque for overcoming engine friction, T r represents the inertial torque of engine rotation, T e1 and T e2 respectively represent the first torque and the second torque for dragging the engine speed to rise, μ1 and μ2 respectively represent the torque transmission coefficients when the clutch is in the first position and the second position, and T e2 >T e1 .

[0008] Optionally, the method further includes: obtaining a mapping relationship among the engine speed, the engine water temperature, and the engine friction torque; determining the current engine friction torque according to the current engine speed, the current engine water temperature, and the mapping relationship; correcting the current engine friction torque by using the current engine oil pressure to obtain a corrected current friction torque, and determining the corrected current friction torque as the engine friction torque to be overcome, where the engine friction torque to be overcome includes the first engine friction torque to be overcome and the second engine friction torque to be overcome.

[0009] Optionally, the method further includes: if the motor demand torque is greater than the maximum motor torque, determining the current friction coefficient μ according to the third formula μ = (T max - T v ) / (T f + T r ), where T max represents the maximum motor torque, T v represents the current motor torque, T f represents the engine friction torque to be overcome, and T r represents the inertial torque of the engine rotation; determining the current clutch engagement position according to the current friction coefficient; if the current clutch engagement position is between the fully disengaged position and the first position, performing clutch engagement control according to the control logic of the first position.

[0010] Optionally, before determining the current clutch engagement position according to the current friction coefficient, the method further includes: obtaining a correspondence between the friction coefficient and the clutch engagement position; determining the current clutch engagement position according to the current friction coefficient and the correspondence between the friction coefficient and the clutch engagement position.

[0011] Optionally, the method further includes: presetting the fuel injection amounts for maintaining various engine speeds; determining an increased fuel injection amount according to the difference between the engine target speed and the current engine speed; obtaining the sum of the increased fuel injection amount and the fuel injection amount corresponding to the current engine speed to obtain a summed fuel injection amount; determining the smaller value between the summed fuel injection amount and the maximum allowable fuel injection amount as the final fuel injection amount.

[0012] According to a second aspect of the present application, a control device for parallel hybrid vehicle mode switching is provided, including: a first switching unit, configured to, if not in a gear shifting process, obtain the current motor speed and the current motor torque, adjust the motor output torque to be equal to the sum of the current motor torque and the first motor torque for driving the engine to drive the engine speed to a preset speed, after the engine oil pressure rises over time and rises to a preset engine oil pressure, adjust the motor output torque to be equal to the sum of the current motor torque and the second motor torque for driving the engine, so as to drive the engine speed to a difference from the current motor speed less than a preset speed difference to realize switching the parallel hybrid vehicle from the pure electric mode to the hybrid mode, wherein the preset speed is less than the current motor speed and greater than the engine fuel injection speed, the first motor torque for driving the engine is related to the preset speed, and the second motor torque for driving the engine is related to the current motor speed; a second switching unit, configured to, if in a gear shifting process, when the gear selection is completed and the parallel hybrid vehicle has a gear engagement requirement, control the motor to drive the engine and simultaneously increase the engine fuel injection amount to adjust the engine speed to a difference from the current motor speed less than the preset speed difference to realize switching the parallel hybrid vehicle from the pure electric mode to the hybrid mode.

[0013] According to a third aspect of the present application, a computer-readable storage medium is provided, the computer-readable storage medium includes a stored program, wherein, when the program runs, it controls the device where the computer-readable storage medium is located to execute any one of the control methods for parallel hybrid vehicle mode switching.

[0014] According to a fourth aspect of the present application, an electronic device is provided, including: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include those for executing any one of the control methods for parallel hybrid vehicle mode switching.

[0015] Applying the technical solution of the present application, for the case of not being in a gear shifting process, by increasing the motor output torque multiple times, the engine speed is driven to a difference from the current motor speed less than the preset speed difference to realize switching the parallel hybrid vehicle from the pure electric mode to the hybrid mode, and the vehicle speed can be ensured to be within a suitable range during the whole process, meeting the comfort requirements during the vehicle driving process. For the case of being in a gear shifting process, the motor drives the engine and simultaneously increases the engine fuel injection amount, shortening the vehicle power interruption time. Description of the Drawings

[0016] The accompanying drawings of the specification, which form a part of this application, are used to provide a further understanding of this application. The schematic embodiments and descriptions thereof of this application are used to explain this application and do not constitute an improper limitation to this application. In the drawings:

[0017] Figure 1 It shows a schematic flow chart of a control method for parallel hybrid vehicle mode switching provided according to an embodiment of this application;

[0018] Figure 2 It shows a schematic diagram of the clutch position provided according to an embodiment of this application;

[0019] Figure 3 It shows a flow chart of a method for determining the motor-driving engine torque according to an embodiment of this application;

[0020] Figure 4 It shows a flow chart of a method for determining the friction torque according to an embodiment of this application;

[0021] Figure 5 It shows a schematic diagram of the parallel hybrid system of a parallel hybrid vehicle provided according to an embodiment of this application;

[0022] Figure 6 It shows a structural block diagram of a control device for parallel hybrid vehicle mode switching provided according to an embodiment of this application. Detailed Description of the Embodiment

[0023] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments may be combined with each other. The following will describe this application in detail with reference to the drawings and in combination with the embodiments.

[0024] In order to enable those skilled in the art to better understand the solution of this application, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0025] It should be noted that the terms "first", "second", etc. in the description, claims and the above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so as to implement the embodiments of the present application described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or devices.

[0026] As introduced in the background art, when the existing parallel hybrid vehicle switches from the pure electric mode to the hybrid mode, the vehicle speed of the whole vehicle decreases and the power interruption time of the whole vehicle is relatively long. To solve the problem that the vehicle speed of the parallel hybrid vehicle decreases and the power interruption time of the whole vehicle is relatively long when switching from the pure electric mode to the hybrid mode, the embodiments of the present application provide a control method, device, computer-readable storage medium and electronic device for the mode switching of the parallel hybrid vehicle.

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0028] In this embodiment, a control method for the mode switching of a parallel hybrid vehicle running on a vehicle control terminal is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0029] Figure 1 It is a flowchart of the control method for the mode switching of the parallel hybrid vehicle according to the embodiment of the present application. As Figure 1 shown, the method includes the following steps:

[0030] Step S101, if not in the gear shifting process, obtain the current motor speed and the current motor torque, adjust the motor output torque to be equal to the sum of the current motor torque and the first motor torque for dragging the engine, so as to drag the engine speed to the preset speed. After the oil pressure rises with time and rises to the preset oil pressure, adjust the motor output torque to be equal to the sum of the current motor torque and the second motor torque for dragging the engine, so as to drag the engine speed to a difference less than the preset speed difference from the current motor speed, realizing the switching of the parallel hybrid vehicle from the pure electric mode to the hybrid mode.

[0031] Among them, the preset speed is less than the current motor speed and greater than the engine fuel injection speed. The torque of the first motor dragging the engine is related to the preset speed, and the torque of the second motor dragging the engine is related to the current motor speed;

[0032] The above setting that the preset speed is less than the current motor speed and greater than the engine fuel injection speed is to build the oil pressure to prepare for the subsequent increase in the engine speed;

[0033] Specifically, referring to Figure 2 , when the clutch is in the first position, adjust the motor output torque to be equal to the sum of the current motor torque and the torque of the first motor dragging the engine to drag the engine speed to the preset speed; when the clutch is in the second position, adjust the motor output torque to be equal to the sum of the current motor torque and the torque of the second motor dragging the engine; it can be seen that the first position is after the slip point but before the second position, and the second position is closer to the fully engaged position.

[0034] Figure 2 Specifically shows the position change direction when the clutch is engaged, from the fully disengaged position to the slip point to the first position to the second position and finally to the fully engaged position.

[0035] Among them, the engine fuel injection speed is related to factors such as the specific design of the engine, the usage scenario of the vehicle, fuel efficiency, and emission standards. Specifically, different engine designs have different optimal operating speed ranges. For example, some engines may achieve higher fuel efficiency at lower speeds, while some require higher speeds. The usage scenarios of the vehicle include urban driving, highway driving, etc.; in some cases, to improve fuel efficiency, the engine may operate at a lower speed to reduce fuel consumption. In some cases, to meet increasingly strict emission standards, the engine may be designed to operate at a lower speed to reduce emissions.

[0036] Among them, the setting of the preset oil pressure is also related to factors such as the specific design of the engine, the usage scenario of the vehicle, fuel efficiency, and emission standards;

[0037] In the above, the ideal situation of dragging the engine speed to a difference less than the preset speed difference from the current motor speed is to drag the engine speed to be equal to the current motor speed;

[0038] Step S102, if in the gear shifting process, when the gear selection is completed and the parallel hybrid vehicle has a gear engagement requirement, control the motor to drag the engine and simultaneously increase the engine fuel injection amount to adjust the engine speed to a difference less than the preset speed difference from the current motor speed to realize the switching of the parallel hybrid vehicle from the pure electric mode to the hybrid mode.

[0039] Specifically, the preset rotational speed difference can be set to 50 r / min, 45 r / min, 40 r / min, and so on;

[0040] In the solution of the present application, for the case where the vehicle is not in the shifting process, by increasing the motor output torque multiple times, the rotational speed of the engine is dragged to be less than the preset rotational speed difference from the current rotational speed of the motor, so as to switch the parallel hybrid vehicle from the pure electric mode to the hybrid mode. During the whole process, the vehicle speed can be ensured to be within a suitable range, meeting the comfort requirements during the vehicle driving process. For the case where the vehicle is in the shifting process, the motor drags the engine while increasing the fuel injection amount of the engine, so as to shorten the vehicle power interruption time.

[0041] In some specific embodiments, as Figure 3 shown, the control method for the mode switching of the parallel hybrid vehicle in the present application further includes:

[0042] Step S301: Determine the torque of the first motor dragging the engine by using the first formula T1 = (T f1 + T r + T e1 ) / μ1;

[0043] Step S302: Determine the torque of the second motor dragging the engine by using the second formula T2 = (T f2 + T r + T e2 ) / μ2;

[0044] Wherein, T1 and T2 respectively represent the torque of the first motor dragging the engine and the torque of the second motor dragging the engine, T f1 , T f2 respectively represent the first torque for overcoming the engine friction torque and the second torque for overcoming the engine friction torque, T r represents the inertial torque of the engine rotation, T e1 , T e2 respectively represent the first torque and the second torque for dragging the engine rotational speed to rise, T e2 > T e1 , and μ1 and μ2 respectively represent the torque transmission coefficients when the clutch is in the first position (see Figure 2 ) and the second position (see Figure 2 );

[0045] Wherein, the torque transmission coefficient is related to the position of the clutch. The closer the clutch is to the fully engaged position, the larger the torque transmission coefficient, that is, the above μ2 > μ1.

[0046] It should be further noted that the torque for dragging the engine speed to rise (including the first torque 1 for dragging the engine speed to rise and the second torque for dragging the engine speed to rise) is the torque for dragging the engine speed to rise after overcoming the friction torque and the inertia torque. The larger this value is, the faster the engine speed rises.

[0047] Among them, the inertia torque of the engine rotation is preset and is related to factors such as the mass distribution of the engine, the moment of inertia of the engine, the design of the engine, and the working conditions of the engine. Specifically, the mass distribution of each component inside the engine has a direct impact on the inertia torque. Areas with uneven or concentrated mass distribution will generate a larger inertia torque. The moment of inertia is the resistance of an object to changes in rotational motion, and it is related to the mass distribution of the object and the position of the axis of rotation. The larger the moment of inertia, the larger the inertia torque. The design of the engine, including its size, shape, and material, will all affect its inertia torque. The working conditions of the engine, such as load and temperature, will affect the working state of the engine and thus affect the inertia torque.

[0048] To achieve the determination of overcoming the engine friction torque, in the embodiments of the present application, as Figure 4 shown, the control method for the parallel hybrid vehicle mode switching in the present application further includes:

[0049] Step S401: Obtain the mapping relationship among the engine speed, the engine coolant temperature, and the engine friction torque; among them, the engine friction torque changes with the engine speed and the engine coolant temperature. The lower the engine coolant temperature and the higher the engine speed, the greater the engine friction torque. Among them, the engine coolant temperature is the coolant temperature of the engine, that is, the temperature inside the engine. In the MAP (performance map) of the engine, the coolant temperature and the speed are two important parameters, which jointly affect the performance and efficiency of the engine. When the coolant temperature is low, the internal friction of the engine is large, so a larger torque is required to overcome this friction, resulting in an increase in speed.

[0050] Step S402: Determine the current engine friction torque according to the current engine speed, the current engine coolant temperature, and the mapping relationship; among them, the mapping relationship is represented by MAP;

[0051] Step S403: Correct the current engine friction torque with the current engine oil pressure to obtain the corrected current friction torque, and determine the corrected current friction torque as the torque for overcoming the engine friction torque. The torque for overcoming the engine friction torque includes the first torque for overcoming the engine friction torque and the second torque for overcoming the engine friction torque.

[0052] To achieve a more accurate determination of the engine friction torque to be overcome, it is necessary to correct the current engine friction torque determined according to the MAP. Specifically, there is a corresponding relationship between the oil pressure and the correction coefficient. The lower the oil pressure, the larger the correction coefficient; conversely, the higher the oil pressure, the smaller the correction coefficient. Among them, the corrected current friction torque is obtained by multiplying the correction coefficient by the current engine friction torque.

[0053] In some embodiments of the present application, the control method for the parallel hybrid vehicle mode switching in the present application further includes: if the motor demand torque is greater than the motor maximum torque, according to the third formula μ = (T max -T v ) / ( T f +T r )to determine the current friction coefficient μ, where T max represents the motor maximum torque, T v represents the motor current torque, T f represents the torque to overcome the engine friction torque, T r represents the inertial torque of the engine rotation; determine the current clutch engagement position according to the current friction coefficient; if the current clutch engagement position is between the fully disengaged position and the first position, perform clutch engagement control according to the control logic of the first position.

[0054] Specifically, before determining the current clutch engagement position according to the current friction coefficient, the control method for the parallel hybrid vehicle mode switching in the present application further includes: obtaining the corresponding relationship between the friction coefficient and the clutch engagement position; determining the current clutch engagement position according to the current friction coefficient and the corresponding relationship between the friction coefficient and the clutch engagement position.

[0055] As described above, there is a corresponding relationship between the current friction coefficient and the current clutch engagement position, which can be represented as a curve;

[0056] That is to say, if the motor demand torque exceeds the motor maximum torque, it is necessary to determine the current friction coefficient based on the preset relationship μ = (T max -T v ) / ( T f +T r ), then determine the current clutch engagement position according to the current friction coefficient, and then perform the subsequent control logic according to the current clutch engagement position. Specifically, if the current clutch engagement position is between the fully disengaged position and the first position, perform clutch engagement control according to the control logic of the first position, reduce the motor output torque to meet the torque for the motor to drive the engine, and when the speed reaches the fuel injection speed, the clutch disengages, and the engine speed is increased by fuel injection;

[0057] It further includes that if the current engagement position of the clutch is between the first position and the second position, the clutch engagement control is performed according to the actual position. The determination of the engine torque driven by the motor still follows the first formula and the second formula.

[0058] In some further embodiments of the present application, the control method for the parallel hybrid vehicle mode switching in the present application further includes: presetting the fuel injection amounts for maintaining various engine speeds; determining the increased fuel injection amount according to the difference between the engine target speed and the engine current speed; obtaining the sum of the increased fuel injection amount and the fuel injection amount corresponding to the engine current speed to get the total fuel injection amount; and determining the smaller value between the total fuel injection amount and the maximum allowable fuel injection amount as the final fuel injection amount. That is, the fuel injection amount is adjusted according to the speed to ensure comfort and a short vehicle power interruption time while realizing mode switching.

[0059] The above control method for the parallel hybrid vehicle mode switching is applicable to Figure 5 the parallel hybrid system of the parallel hybrid vehicle. Specifically, the parallel hybrid system of the parallel hybrid vehicle includes an ECU (Electronic Control Unit), an engine, a clutch, a drive motor / generator, a gearbox, a motor controller / MCU (Microcontroller Unit), a TCU (Transmission Control Unit), a power battery / BMS (Battery Management System), a DC / AC (Direct Current / Alternating Current), an electric power steering pump, a shift panel, an HCU, and an instrument panel.

[0060] The embodiment of the present application further provides a control device for the parallel hybrid vehicle mode switching. It should be noted that the control device for the parallel hybrid vehicle mode switching in the embodiment of the present application can be used to execute the control method for the parallel hybrid vehicle mode switching provided in the embodiment of the present application. This device is used to implement the above embodiments and preferred implementation manners, and those that have been described will not be repeated. As used hereinafter, the term "module" can be a combination of software and / or hardware that can achieve a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware is also possible and contemplated.

[0061] The following introduces the control device for the parallel hybrid vehicle mode switching provided by the embodiment of the present application.

[0062] Figure 6 is a schematic diagram of the control device for the parallel hybrid vehicle mode switching according to the embodiment of the present application. As Figure 6As shown, the device includes:

[0063] A first switching unit 61, which is used to, when not in a gear shifting process, obtain the current motor speed and the current motor torque, adjust the motor output torque to be equal to the sum of the current motor torque and the first motor's torque for dragging the engine, so as to drag the engine speed to a preset speed. After the engine oil pressure rises with time and reaches the preset engine oil pressure, adjust the motor output torque to be equal to the sum of the current motor torque and the second motor's torque for dragging the engine, so as to drag the engine speed to a difference less than a preset speed difference from the current motor speed, thereby realizing the switching of the parallel hybrid vehicle from the pure electric mode to the hybrid mode. Wherein, the preset speed is less than the current motor speed and greater than the engine injection speed, the first motor's torque for dragging the engine is related to the preset speed, and the second motor's torque for dragging the engine is related to the current motor speed;

[0064] A second switching unit 62, which is used to, when in a gear shifting process, and when the gear selection is completed and the parallel hybrid vehicle has a gear engagement requirement, control the motor to drag the engine and simultaneously increase the engine fuel injection amount to adjust the engine speed to a difference less than a preset speed difference from the current motor speed, thereby realizing the switching of the parallel hybrid vehicle from the pure electric mode to the hybrid mode.

[0065] In the solution of the present application, for the case of not being in a gear shifting process, by increasing the motor output torque multiple times, the engine speed is dragged to a difference less than a preset speed difference from the current motor speed, thereby realizing the switching of the parallel hybrid vehicle from the pure electric mode to the hybrid mode. During the whole process, the vehicle speed can be ensured to be within a suitable range, meeting the comfort requirements during the vehicle driving process. For the case of being in a gear shifting process, the motor drags the engine and simultaneously increases the engine fuel injection amount, shortening the vehicle power interruption time.

[0066] In some embodiments of the present application, the device further includes a first determination unit and a second determination unit. The first determination unit is used to determine the first motor's torque for dragging the engine by using the first formula T1 = (T f1 +T r +T e1 ) / μ1; the second determination unit is used to determine the second motor's torque for dragging the engine by using the second formula T2 = (T f2 +T r +T e2 ) / μ2; wherein, T1 and T2 respectively represent the first motor's torque for dragging the engine and the second motor's torque for dragging the engine, T f1 and T f2 respectively represent the first torque for overcoming engine friction and the second torque for overcoming engine friction, T r represents the inertial torque of the engine rotation, T e1 and T e2respectively represent the first torque and the second torque for dragging the engine speed to rise, μ1 and μ2 respectively represent the torque transmission coefficients when the clutch is in the first position and the second position, T e2 > T e1 . Among them, the torque transmission coefficient is related to the position of the clutch. The closer the clutch is to the fully engaged position, the greater the torque transmission coefficient, that is, the above μ2 > μ1. It should be further noted that the torque for dragging the engine speed to rise (including the first torque for dragging the engine speed to rise and the second torque for dragging the engine speed to rise) is the torque for dragging the engine speed to rise after overcoming the frictional torque and the inertial torque. The larger this value, the faster the engine speed rises.

[0067] In some embodiments of the present application, the device further includes a first acquisition unit, a third determination unit, and a correction unit. The first acquisition unit is used to acquire the mapping relationship among the engine speed, the engine water temperature, and the engine frictional torque; the third determination unit is used to determine the current engine frictional torque according to the current engine speed, the current engine water temperature, and the mapping relationship; the correction unit is used to correct the current engine frictional torque by using the current engine oil pressure to obtain the corrected current frictional torque, and determine the corrected current frictional torque as the torque for overcoming the engine frictional torque. The torque for overcoming the engine frictional torque includes the first torque for overcoming the engine frictional torque and the second torque for overcoming the engine frictional torque. To achieve a more accurate determination of the torque for overcoming the engine frictional torque, it is necessary to correct the current engine frictional torque determined according to the MAP. Specifically, there is a corresponding relationship between the engine oil pressure and the correction coefficient. The lower the engine oil pressure, the larger the correction coefficient. On the contrary, the higher the engine oil pressure, the smaller the correction coefficient. Among them, the corrected current frictional torque is obtained by multiplying the correction coefficient by the current engine frictional torque.

[0068] In some embodiments of the present application, the device further includes a fourth determination unit, a fifth determination unit, and a first control unit. The fourth determination unit is used to, if the motor demand torque is greater than the motor maximum torque, determine the current friction coefficient μ according to the third formula μ = (T max - T v ) / (T f + T r ), where T max represents the motor maximum torque, T v represents the current motor torque, T f represents the torque for overcoming the engine frictional torque, and T r represents the inertial torque of the engine rotation; the fifth determination unit is used to determine the current engagement position of the clutch according to the current friction coefficient; the first control unit is used to, if the current engagement position of the clutch is between the fully disengaged position and the first position, perform clutch engagement control according to the control logic of the first position.

[0069] In some embodiments of the present application, the device further includes a second acquisition unit and a sixth determination unit. The second acquisition unit is configured to acquire the correspondence between the friction coefficient and the clutch engagement position before determining the current clutch engagement position according to the current friction coefficient; the sixth determination unit is configured to determine the current clutch engagement position according to the current friction coefficient and the correspondence between the friction coefficient and the clutch engagement position. As described above, there is a corresponding relationship between the current friction coefficient and the current clutch engagement position, which can be represented as a curve.

[0070] In some embodiments of the present application, the device further includes a setting unit, a seventh determination unit, a third acquisition unit, and an eighth determination unit. The setting unit is configured to preset the fuel injection amount for maintaining various engine speeds; the seventh determination unit is configured to determine the increased fuel injection amount according to the difference between the target engine speed and the current engine speed; the third acquisition unit is configured to acquire the sum of the increased fuel injection amount and the fuel injection amount corresponding to the current engine speed to obtain the total fuel injection amount; the eighth determination unit is configured to determine the smaller value between the total fuel injection amount and the maximum allowable fuel injection amount as the final fuel injection amount. That is, the fuel injection amount is adjusted according to the engine speed to achieve mode switching while ensuring comfort and a short vehicle power interruption time.

[0071] The control device for parallel hybrid vehicle mode switching includes a processor and a memory. The above-mentioned first switching unit, second switching unit, etc. are all stored in the memory as program units, and the corresponding functions are implemented by the processor executing the above program units stored in the memory. The above modules are all located in the same processor; or, the above modules are respectively located in different processors in any combination form.

[0072] The processor contains a kernel, and the kernel retrieves the corresponding program unit from the memory. One or more kernels can be set, and by adjusting the kernel parameters, the problems in the prior art that the vehicle speed decreases and the vehicle power interruption time is long when the parallel hybrid vehicle switches from the pure electric mode to the hybrid mode can be solved.

[0073] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of, for example, read-only memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip.

[0074] Embodiments of the present invention provide an electronic device, including: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include a control method for performing any kind of parallel hybrid vehicle mode switching.

[0075] An embodiment of the present invention provides a computer-readable storage medium. The computer-readable storage medium includes a stored program. When the program runs, it controls the device where the computer-readable storage medium is located to execute a control method for switching the parallel hybrid vehicle mode.

[0076] Specifically, the control method for switching the parallel hybrid vehicle mode includes:

[0077] Step S101, if not in the gear-shifting process, obtain the current motor speed and the current motor torque, adjust the motor output torque to be equal to the sum of the current motor torque and the first motor torque for dragging the engine, so as to drag the engine speed to a preset speed. After the engine oil pressure rises with time and rises to the preset engine oil pressure, adjust the motor output torque to be equal to the sum of the current motor torque and the second motor torque for dragging the engine, so as to drag the engine speed to a difference less than the preset speed difference from the current motor speed, thereby realizing the switching of the parallel hybrid vehicle from the pure electric mode to the hybrid mode. Wherein, the preset speed is less than the current motor speed and greater than the engine fuel injection speed. The first motor torque for dragging the engine is related to the preset speed, and the second motor torque for dragging the engine is related to the current motor speed;

[0078] Step S102, if in the gear-shifting process, when the gear selection is completed and the parallel hybrid vehicle has a gear engagement requirement, control the motor to drag the engine and simultaneously increase the engine fuel injection amount to adjust the engine speed to a difference less than the preset speed difference from the current motor speed, thereby realizing the switching of the parallel hybrid vehicle from the pure electric mode to the hybrid mode.

[0079] Optionally, the above method further includes: using the first formula T1 = (T f1 +T r +T e1 ) / μ1 to determine the above-mentioned first motor torque for dragging the engine; using the second formula T2 = (T f2 +T r +T e2 ) / μ2 to determine the above-mentioned second motor torque for dragging the engine; wherein, T1 and T2 respectively represent the above-mentioned first motor torque for dragging the engine and the second motor torque for dragging the engine, T f1 、T f2 respectively represent the first torque for overcoming engine friction and the second torque for overcoming engine friction, T r represents the inertial torque of the engine rotation, T e1 、T e2 respectively represent the first torque and the second torque for dragging the engine speed to rise, μ1 and μ2 respectively represent the torque transmission coefficients when the clutch is in the first position and the second position, and T e2 >T e1 .

[0080] Optionally, the above method further includes: obtaining the mapping relationship among the engine speed, engine water temperature, and engine friction torque; determining the current engine friction torque according to the current engine speed, current engine water temperature, and the above mapping relationship; correcting the current engine friction torque with the current engine oil pressure to obtain the corrected current friction torque, and determining the corrected current friction torque as the engine friction torque to be overcome, where the engine friction torque to be overcome includes the first engine friction torque to be overcome and the second engine friction torque to be overcome.

[0081] Optionally, the above method further includes: if the motor demand torque is greater than the motor maximum torque, determining the current friction coefficient μ according to the third formula μ = (T max - T v ) / (T f + T r ), where T max represents the motor maximum torque, T v represents the current motor torque, T f represents the engine friction torque to be overcome, and T r represents the inertial torque of the engine rotation; determining the current clutch engagement position according to the above current friction coefficient; if the current clutch engagement position is between the fully disengaged position and the above first position, performing clutch engagement control according to the control logic of the above first position.

[0082] Optionally, before determining the current clutch engagement position according to the above current friction coefficient, the above method further includes: obtaining the correspondence between the friction coefficient and the clutch engagement position; determining the current clutch engagement position according to the above current friction coefficient and the correspondence between the friction coefficient and the clutch engagement position.

[0083] Optionally, the above method further includes: presetting the fuel injection amounts for maintaining various engine speeds; determining the increased fuel injection amount according to the difference between the engine target speed and the current engine speed; obtaining the sum of the increased fuel injection amount and the fuel injection amount corresponding to the current engine speed to obtain the total fuel injection amount; determining the smaller value between the total fuel injection amount and the maximum allowable fuel injection amount as the final fuel injection amount.

[0084] An embodiment of the present invention provides a processor for running a program, where when the program runs, it executes the control method for the parallel hybrid vehicle mode switching.

[0085] Specifically, the control method for the parallel hybrid vehicle mode switching includes:

[0086] Step S101, if not in the gear shifting process, obtain the current motor speed and the current motor torque, adjust the motor output torque to be equal to the sum of the current motor torque and the first motor's engine-dragging torque to drag the engine speed to a preset speed. After the engine oil pressure rises over time and reaches the preset engine oil pressure, adjust the motor output torque to be equal to the sum of the current motor torque and the second motor's engine-dragging torque to drag the engine speed to a difference less than the preset speed difference from the current motor speed, thereby realizing the switching of the parallel hybrid vehicle from the pure electric mode to the hybrid mode. Herein, the preset speed is less than the current motor speed and greater than the engine injection speed, the first motor's engine-dragging torque is related to the preset speed, and the second motor's engine-dragging torque is related to the current motor speed;

[0087] Step S102, if in the gear shifting process, when the gear selection is completed and the parallel hybrid vehicle has a gear engagement requirement, control the motor to drag the engine and simultaneously increase the engine fuel injection volume to adjust the engine speed to a difference less than the preset speed difference from the current motor speed, thereby realizing the switching of the parallel hybrid vehicle from the pure electric mode to the hybrid mode.

[0088] An embodiment of the present invention provides a device, which includes a processor, a memory, and a program stored on the memory and executable on the processor. When the processor executes the program, it realizes at least the following steps:

[0089] Step S101, if not in the gear shifting process, obtain the current motor speed and the current motor torque, adjust the motor output torque to be equal to the sum of the current motor torque and the first motor's engine-dragging torque to drag the engine speed to a preset speed. After the engine oil pressure rises over time and reaches the preset engine oil pressure, adjust the motor output torque to be equal to the sum of the current motor torque and the second motor's engine-dragging torque to drag the engine speed to a difference less than the preset speed difference from the current motor speed, thereby realizing the switching of the parallel hybrid vehicle from the pure electric mode to the hybrid mode. Herein, the preset speed is less than the current motor speed and greater than the engine injection speed, the first motor's engine-dragging torque is related to the preset speed, and the second motor's engine-dragging torque is related to the current motor speed;

[0090] Step S102, if in the gear shifting process, when the gear selection is completed and the parallel hybrid vehicle has a gear engagement requirement, control the motor to drag the engine and simultaneously increase the engine fuel injection volume to adjust the engine speed to a difference less than the preset speed difference from the current motor speed, thereby realizing the switching of the parallel hybrid vehicle from the pure electric mode to the hybrid mode.

[0091] The device in this article can be a server, a PC, a PAD, a mobile phone, etc.

[0092] The present application also provides a computer program product, which, when executed on a data processing device, is adapted to execute a program initialized with at least the following method steps:

[0093] Step S101, if not in a gear shifting process, obtain the current motor speed and the current motor torque, adjust the motor output torque to be equal to the sum of the current motor torque and the first motor torque for dragging the engine, so as to drag the engine speed to a preset speed. After the engine oil pressure rises over time and reaches the preset engine oil pressure, adjust the motor output torque to be equal to the sum of the current motor torque and the second motor torque for dragging the engine, so as to drag the engine speed to a difference from the current motor speed less than a preset speed difference, thereby realizing the switching of the parallel hybrid vehicle from the pure electric mode to the hybrid mode. Herein, the preset speed is less than the current motor speed and greater than the engine fuel injection speed, the first motor torque for dragging the engine is related to the preset speed, and the second motor torque for dragging the engine is related to the current motor speed;

[0094] Step S102, if in a gear shifting process, when the gear selection is completed and the parallel hybrid vehicle has a gear engagement requirement, control the motor to drag the engine and simultaneously increase the engine fuel injection amount to adjust the engine speed to a difference from the current motor speed less than a preset speed difference, thereby realizing the switching of the parallel hybrid vehicle from the pure electric mode to the hybrid mode.

[0095] Obviously, those skilled in the art should understand that the above-mentioned modules or steps of the present invention can be implemented by a general-purpose computing device. They can be concentrated on a single computing device or distributed on a network composed of multiple computing devices. They can be implemented by program codes executable by the computing device. Thus, they can be stored in a storage device and executed by the computing device. And in some cases, the steps shown or described herein can be executed in a different order, or they can be separately fabricated into individual integrated circuit modules, or multiple modules or steps among them can be fabricated into a single integrated circuit module for implementation. In this way, the present invention is not limited to any specific combination of hardware and software.

[0096] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memories, CD-ROMs, optical memories, etc.) containing computer-usable program codes.

[0097] This application is described with reference to the flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, and combinations of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processors of general-purpose computers, special-purpose computers, embedded processors, or other programmable data processing devices to produce a machine, such that the instructions executed by the processors of the computer or other programmable data processing devices produce means for implementing the functions specified in one or more of the flows Figure 1 one or more of the flows and / or blocks Figure 1 or means for implementing the functions specified in one or more of the blocks.

[0098] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer-readable memory produce a manufacture including instruction means that implement the functions specified in one or more of the flows Figure 1 one or more of the flows and / or blocks Figure 1 or means for implementing the functions specified in one or more of the blocks.

[0099] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more of the flows Figure 1 one or more of the flows and / or blocks Figure 1 or means for implementing the functions specified in one or more of the blocks.

[0100] In a typical configuration, a computing device includes one or more processors (CPUs), an input / output interface, a network interface, and memory.

[0101] The memory may include non-permanent memory in the form of computer-readable media, random access memory (RAM), and / or non-volatile memory, such as read-only memory (ROM) or flash memory (flash RAM). The memory is an example of computer-readable media.

[0102] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0103] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0104] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A control method for mode switching of a parallel hybrid vehicle, characterized in that: include: If the gear shifting process is not in progress, in the process of switching the parallel hybrid vehicle from the pure electric mode to the hybrid mode, the clutch engagement position changes in sequence: fully separated position, sliding membrane point, first position, second position and fully engaged position, and the current speed and current torque of the motor are obtained. When the clutch engagement position is the first position, the motor output torque is adjusted to be equal to the sum of the current torque of the motor and the torque of the first motor dragging the engine to drag the engine speed to a preset speed. After the oil pressure rises over time and rises to the preset oil pressure, when the clutch engagement position reaches the second position, the motor output torque is adjusted to be equal to the sum of the current torque of the motor and the torque of the second motor dragging the engine to drag the engine speed to a difference with the current speed of the motor that is less than the preset speed difference, so as to realize switching the parallel hybrid vehicle from the pure electric mode to the hybrid mode. The preset speed is less than the current speed of the motor and greater than the fuel injection speed of the engine, the first motor drives the engine torque related to the preset speed, and the second motor drives the engine torque related to the current speed of the motor; If the parallel hybrid vehicle is in the gear shifting process, after the gear selection is completed and there is a gear shifting requirement for the parallel hybrid vehicle, the motor is controlled to drive the engine while increasing the fuel injection amount of the engine to adjust the speed of the engine to a value that is less than the preset speed difference with the current speed of the motor, so as to switch the parallel hybrid vehicle from the pure electric mode to the hybrid mode; In the process of switching the parallel hybrid vehicle from the pure electric mode to the hybrid mode, the method further includes: If the motor demand torque is greater than the motor maximum torque, according to the third formula μ=(T max -T v ) / ( T f +T r ) determines the current friction coefficient μ, where T max Indicates the maximum torque of the motor, T v Indicates the current torque of the motor, T f Indicates the torque to overcome engine friction, T r Indicates the inertia torque of the engine rotation; determining a current engagement position of the clutch according to the current friction coefficient; If the current engagement position of the clutch is between the completely disengaged position and the first position, the clutch engagement control is performed according to the control logic of the first position.

2. The method according to claim 1, characterized in that The method further comprises: Using the first formula T1=(T f1 +T r +T e1 ) / μ1 determines the first motor drag engine torque; Using the second formula T2=(T f2 +T r +T e2 ) / μ2 determines the second motor drag engine torque; Wherein, T1 and T2 represent the first motor driving engine torque and the second motor driving engine torque respectively, T f1 , T f2 They represent the first torque to overcome engine friction and the second torque to overcome engine friction, T r Indicates the inertia torque of the engine rotation, T e1 , T e2 They represent the first torque and the second torque that drive the engine speed up, μ1 and μ2 represent the torque transmission coefficient when the clutch is in the first position and the torque transmission coefficient when the clutch is in the second position, respectively. e2 >T e1 .

3. The method according to claim 2, characterized in that The method further comprises: Obtaining a mapping relationship between engine speed, engine water temperature, and engine friction torque; Determine the current friction torque of the engine according to the current engine speed, the current engine water temperature and the mapping relationship; The current friction torque of the engine is corrected using the current oil pressure to obtain a corrected current friction torque, and the corrected current friction torque is determined as the torque for overcoming engine friction, wherein the torque for overcoming engine friction includes the first torque for overcoming engine friction and the second torque for overcoming engine friction.

4. The method according to claim 1, characterized in that Before determining the current engagement position of the clutch according to the current friction coefficient, the method further includes: Obtaining the corresponding relationship between the friction coefficient and the clutch engagement position; The current clutch engagement position is determined according to the current friction coefficient and the corresponding relationship between the friction coefficient and the clutch engagement position.

5. The method according to claim 1, characterized in that The method further comprises: Pre-set the fuel injection amount to maintain various engine speeds; Determine the increase in fuel injection amount according to the difference between the target engine speed and the current engine speed; Obtaining the sum of the increased fuel injection amount and the fuel injection amount corresponding to the current speed of the engine to obtain a summed fuel injection amount; The smaller value between the summed injection quantity and the maximum permissible injection quantity is determined as the final injection quantity.

6. A control device for switching modes of a parallel hybrid vehicle, characterized in that: include: a first switching unit, for switching the parallel hybrid vehicle from the pure electric mode to the hybrid mode if the gear shifting process is not in progress, the clutch engagement position changes in sequence: fully disengaged position, sliding film point, first position, second position and fully engaged position, obtaining the current speed of the motor and the current torque of the motor, and when the clutch engagement position is the first position, adjusting the motor output torque to be equal to the sum of the current torque of the motor and the first motor drag engine torque to drag the engine speed to a preset speed, and after the oil pressure rises with time and rises to the preset oil pressure, when the clutch engagement position reaches the second position, adjusting the motor output torque to be equal to the sum of the current torque of the motor and the second motor drag engine torque to drag the engine speed to a difference between the current speed of the motor and the preset speed difference, so as to realize switching the parallel hybrid vehicle from the pure electric mode to the hybrid mode, wherein the preset speed is less than the current speed of the motor and greater than the engine injection speed, the first motor drag engine torque is related to the preset speed, and the second motor drag engine torque is related to the current speed of the motor; A second switching unit is used for, if in a gear shifting process, when the gear selection is completed and the parallel hybrid vehicle has a gear shifting requirement, controlling the motor to drive the engine and increasing the engine fuel injection amount to adjust the speed of the engine to a difference between the speed of the motor and the current speed of the motor that is less than the preset speed difference, so as to switch the parallel hybrid vehicle from the pure electric mode to the hybrid mode; The device further includes a fourth determining unit, a fifth determining unit and a first control unit, The fourth determination unit is used for switching the parallel hybrid vehicle from the pure electric mode to the hybrid mode, if the motor demand torque is greater than the motor maximum torque, according to the third formula μ=(T max -T v ) / ( T f +T r ) determines the current friction coefficient μ, where T max Indicates the maximum torque of the motor, T v Indicates the current torque of the motor, T f Indicates the torque to overcome engine friction, T r Indicates the inertia torque of the engine rotation; The fifth determining unit is used to determine the current engagement position of the clutch according to the current friction coefficient; The first control unit is used to perform clutch engagement control according to the control logic of the first position if the current engagement position of the clutch is between the completely disengaged position and the first position.

7. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the control method for parallel hybrid vehicle mode switching according to any one of claims 1 to 5.

8. An electronic device, characterized in that: include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include a control method for executing the parallel hybrid vehicle mode switching as described in any one of claims 1 to 5.

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