Parallel hybrid vehicle mode switching control method and device and electronic equipment

Abstract

The invention provides a parallel hybrid vehicle mode switching control method and device and electronic equipment. The method comprises the steps that under the condition that a gear shifting process is not carried out, the output torque of a motor is increased many times, the rotating speed of an engine is dragged till the difference value between the rotating speed of the engine and the current rotating speed of the motor is smaller than a preset rotating speed difference value, and the parallel hybrid power whole vehicle is switched to a hybrid power mode from a pure electric mode; and for the situation in the gear shifting process, when gear selecting is completed and the parallel hybrid power whole vehicle has the gear engaging requirement, the motor is controlled to drag the engine, meanwhile, the oil injection amount of the engine is increased, the rotating speed of the engine is adjusted to the state that the difference value between the rotating speed of the engine and the current rotating speed of the motor is smaller than the preset rotating speed difference value, and the parallel hybrid power whole vehicle is switched to the hybrid power mode from the pure electric mode. According to the scheme, the torque setting logic not in the gear shifting process can meet the comfort requirement in the whole vehicle driving process, the motor in the gear shifting process drags the engine, meanwhile, the oil injection amount of the engine is increased, and the power interruption time of the whole vehicle is shortened.

Description

Technical Field

[0001] The present application relates to the field of hybrid vehicles, and more specifically, to a control method, device, computer-readable storage medium, and electronic device for mode switching 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 a power source to drive the vehicle. The internal combustion engine and the electric motor are connected in parallel by mechanical means (such as gears, drive shafts) and can drive the wheels directly or indirectly. Depending on driving conditions and battery power, the control system decides when to use the internal combustion engine, the electric motor, or both.

[0003] When switching the parallel hybrid vehicle from pure electric mode to hybrid mode, 1) if it is not in the gear shifting process, the motor will engage with the clutch to pull up, and the motor outputs a fixed torque to drag the vehicle; 2) if it is in the gear shifting process, the current gear will be released first, and the motor will first drag the engine to the target speed through the clutch, and finally re-engage the new gear to continue driving.

[0004] In the case where the gear shift is not performed during the gear shift process, the torque of the motor driving the entire vehicle is reduced, resulting in a reduction in the vehicle speed and poor comfort during driving. In the case of switching during the gear shift process, the motor drags the engine for a longer time, resulting in a longer power interruption time for the entire vehicle. Summary of the invention

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

[0006] In order to achieve the above-mentioned purpose, according to the first aspect of the present application, a control method for mode switching of a parallel hybrid vehicle is provided, including: if it is not in the gear shifting process, obtaining the current speed and current torque of the motor, adjusting the output torque of the motor to be equal to the sum of the current torque of the motor and the torque of the first motor to drag the engine to a preset speed, and after the oil pressure rises over time and rises to the preset oil pressure, adjusting the output torque of the motor to be equal to the sum of the current torque of the motor and the torque of the second motor to drag the engine to drag the engine to a speed difference from the current speed of the motor that is less than the preset speed difference The parallel hybrid vehicle is switched from a pure electric mode to a hybrid mode by controlling the preset speed, wherein the preset speed is less than the current speed of the motor and greater than the fuel injection speed of the engine, 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 speed of the motor; if it is in the gear shifting process, when the gear selection is completed and the parallel hybrid vehicle has a gear shifting requirement, the motor is controlled to drag the engine and at the same time increase the fuel injection amount of the engine to adjust the speed of the engine to a difference with 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.

[0007] Optionally, the method further comprises: using a first formula T1=(T f1 +T r +T e1 ) / μ1 to determine 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 drag engine torque and the second motor drag 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 .

[0008] Optionally, the method also includes: obtaining a mapping relationship between engine speed, engine water temperature and 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 using the current oil pressure to obtain a corrected current friction torque, and determining the corrected current friction torque 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.

[0009] Optionally, 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 It represents the torque to overcome engine friction, T r Indicates the inertia torque of the engine rotation; determines the current engagement position of the clutch according to the current friction coefficient; if the current engagement position of the clutch is between the fully disengaged position and the first position, performs clutch engagement control according to the control logic of the first position.

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

[0011] Optionally, the method also includes: pre-setting the fuel injection amount for maintaining various engine speeds; determining an increase in the fuel injection amount based on 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 obtain a summed fuel injection amount; and determining the smaller value between the summed fuel injection amount and the maximum allowable fuel injection amount as the final fuel injection amount.

[0012] Optionally, the method also includes: if in the gear shifting process, the clutch is fully engaged after the gear is disengaged, the motor is controlled to drag the engine to rotate, and the motor drag torque is determined as the larger torque between the maximum torque of the motor and the drag torque obtained based on the oil pressure lookup table; after the engine speed rises to the engine injection speed, the motor is controlled to drag the engine while controlling the engine injection to increase the engine speed.

[0013] According to a second aspect of the present application, a control device for switching modes of a parallel hybrid vehicle is provided, comprising: a first switching unit, for obtaining a current speed and a current torque of a motor if the gear shifting process is not in progress, adjusting the output torque of the motor to be equal to the sum of the current torque of the motor and the torque of the first motor to drag the engine speed to a preset speed, and after the oil pressure rises over time and rises to the preset oil pressure, adjusting the output torque of the motor to be equal to the sum of the current torque of the motor and the torque of the second motor to drag the engine speed to a difference between the current speed of the motor and the preset speed difference to achieve the parallel The parallel hybrid vehicle switches from a pure electric mode to a 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 drags the engine torque and is related to the preset speed, and the second motor drags the engine torque and is related to the current speed of the motor; a second switching unit is used to control the motor to drag the engine and increase the engine injection amount at the same time to adjust the engine speed to a difference with the current speed of the motor that is less than the preset speed difference when the gear selection is completed and the parallel hybrid vehicle has a gear shifting requirement, so as to switch the parallel hybrid vehicle from the pure electric mode to the hybrid mode.

[0014] According to a third aspect of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium includes a stored program, wherein when the program is running, the device where the computer-readable storage medium is located is controlled to execute any one of the control methods for switching the parallel hybrid vehicle mode.

[0015] According to the fourth aspect of the present application, an electronic device is provided, comprising: 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 any one of the parallel hybrid vehicle mode switching.

[0016] By applying the technical solution of the present application, in the case of not being in the gear shifting process, the parallel hybrid vehicle can be switched from pure electric mode to hybrid mode by increasing the motor output torque multiple times and dragging the engine speed to a value less than the preset speed difference with the current motor speed. During the whole process, the vehicle speed can be kept within an appropriate range to meet the comfort requirements of the vehicle during driving. In the case of being in the gear shifting process, the motor drags the engine and increases the engine fuel injection amount at the same time, so that the power interruption time of the vehicle is shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 A schematic flow chart of a method for controlling mode switching of a parallel hybrid vehicle provided in accordance with an embodiment of the present application is shown;

[0019] Figure 2 A schematic diagram of a clutch position provided according to an embodiment of the present application is shown;

[0020] Figure 3 A flow chart of a method for determining the motor-driven engine torque according to an embodiment of the present application is shown;

[0021] Figure 4 A flow chart of a method for determining friction torque according to an embodiment of the present application is shown;

[0022] Figure 5 A schematic diagram of a parallel hybrid system of a parallel hybrid vehicle provided according to an embodiment of the present application is shown;

[0023] Figure 6 A structural block diagram of a parallel hybrid vehicle mode switching control device provided according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0027] As introduced in the background technology, in the prior art, when a parallel hybrid vehicle switches from a pure electric mode to a hybrid mode, the vehicle speed is reduced and the vehicle power interruption time is long. In order to solve the problem that when a parallel hybrid vehicle switches from a pure electric mode to a hybrid mode, the vehicle speed is reduced and the vehicle power interruption time is long, the embodiments of the present application provide a control method, device, computer-readable storage medium and electronic device for mode switching of a parallel hybrid vehicle.

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0029] In this embodiment, a control method for 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 a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0030] Figure 1 FIG. 1 is a flow chart of a control method for switching modes of a parallel hybrid vehicle according to an embodiment of the present application. Figure 1 As shown, the method comprises the following steps:

[0031] Step S101, if it is not in the gear shifting process, obtain the current speed and torque of the motor, adjust the motor output torque to be equal to the sum of the current torque of the motor and the torque of the first motor to drag the engine to a preset speed, and after the oil pressure rises over time and rises to the preset oil pressure, adjust the motor output torque to be equal to the sum of the current torque of the motor and the torque of the second motor to drag the engine to a speed difference with 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,

[0032] 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 drags the engine torque and is related to the preset speed, and the second motor drags the engine torque and is related to the current speed of the motor;

[0033] The above setting preset speed is less than the current speed of the motor and greater than the engine injection speed, in order to build up the oil pressure in preparation for the subsequent increase in the engine speed;

[0034] Specifically, see Figure 2 , the clutch is in the first position, adjusting the motor output torque to be equal to the sum of the motor's current torque and the first motor's engine drag torque to drag the engine speed to the preset speed; the clutch is in the second position, adjusting the motor output torque to be equal to the sum of the motor's current torque and the second motor's engine drag torque; it can be seen that the first position is after the sliding membrane point but before the second position, and the second position is closer to the fully engaged position.

[0035] Figure 2 Detailedly shown in FIG. 1 is the direction of position change when the clutch is engaged, from the fully disengaged position to the sliding membrane point to the first position to the second position and finally to the fully engaged position.

[0036] Among them, the engine injection speed is related to factors such as the specific design of the engine, the use 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 others require higher speeds. Vehicle use scenarios include city driving, highway driving, etc.; in some cases, in order to improve fuel efficiency, the engine may run at a lower speed to reduce fuel consumption. In some cases, in order to meet increasingly stringent emission standards, the engine may be designed to run at a lower speed to reduce emissions.

[0037] The setting of the preset oil pressure is also related to factors such as the specific design of the engine, the vehicle's usage scenario, fuel efficiency and emission standards;

[0038] In the above, the ideal situation of dragging the engine speed to a value less than the preset speed difference from the current speed of the motor is to drag the engine speed to be equal to the current speed of the motor;

[0039] Step S102, if it is in the gear shifting process, when the gear selection is completed and the parallel hybrid vehicle has a gear shifting requirement, the motor is controlled to drag the engine and the engine fuel injection amount is increased to adjust the engine speed to a difference with the current motor speed that is less than the preset speed difference to switch the parallel hybrid vehicle from pure electric mode to hybrid mode.

[0040] Specifically, the preset speed difference can be set to 50r / min, 45r / min, 40r / min, etc.;

[0041] The solution of this application, in the case of not being in the gear shifting process, by increasing the motor output torque multiple times, the engine speed is dragged to a difference with the motor current speed that is less than the preset speed difference to switch the parallel hybrid vehicle from pure electric mode to hybrid mode. During the whole process, the vehicle speed can be kept within an appropriate range to meet the comfort requirements of the vehicle during driving. In the case of being in the gear shifting process, the motor drags the engine and increases the engine fuel injection amount to shorten the power interruption time of the vehicle.

[0042] In some specific embodiments, Figure 3 As shown, the control method for parallel hybrid vehicle mode switching in the present application also includes:

[0043] Step S301: Using the first formula T1=(T f1 +T r +T e1 ) / μ1 determines the first motor drag engine torque;

[0044] Step S302: Use the second formula T2=(T f2 +T r +T e2 ) / μ2 determines the second motor drag engine torque;

[0045] Wherein, T1 and T2 represent the first motor drag engine torque and the second motor drag 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, T e2 >T e1 , μ1, μ2 respectively indicate that the clutch is in the first position (see Figure 2 ) when the torque transmission coefficient, the second position (see Figure 2 ) when the torque transmission coefficient;

[0046] The torque transfer coefficient is related to the position of the clutch. The closer the clutch is to the fully engaged position, the greater the torque transfer coefficient, that is, μ2>μ1 as mentioned above.

[0047] It should be further explained that the torque that drags the engine speed to increase (including the first torque 1 that drags the engine speed to increase and the second torque that drags the engine speed to increase) is the torque that drags the engine speed to increase after overcoming the friction torque and the inertia torque. The larger the value, the faster the engine speed increases.

[0048] Among them, the inertia torque of the engine rotation is pre-set and is related to factors such as the mass distribution of the engine, the rotational inertia of the engine, the design of the engine, and the operating 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 produce greater inertia torque. The moment of inertia is the resistance of an object to changes in rotational motion, which is related to the mass distribution of the object and the position of the axis of rotation. The greater the moment of inertia, the greater the inertia torque. The design of the engine, including its size, shape, and material, will affect its inertia torque. The operating conditions of the engine, such as load, temperature, etc., will affect the working state of the engine and thus affect the inertia torque.

[0049] In order to achieve the determination of overcoming the engine friction torque, in the embodiment of the present application, as Figure 4 As shown, the control method for parallel hybrid vehicle mode switching in the present application also includes:

[0050] Step S401: Obtain the mapping relationship between engine speed, engine water temperature and engine friction torque; wherein, engine friction torque changes with changes in engine speed and engine water temperature, the lower the engine water temperature, the higher the engine speed, and the greater the engine friction torque. Among them, the engine water temperature is the engine coolant temperature, that is, the temperature inside the engine. In the engine MAP (performance map), water temperature and speed are two important parameters, which together affect the performance and efficiency of the engine. When the water temperature is low, the friction inside the engine is large, so a larger torque is required to overcome this friction, resulting in an increase in speed.

[0051] Step S402: determining the current friction torque of the engine according to the current engine speed, the current engine water temperature and a mapping relationship; wherein the mapping relationship is represented by MAP;

[0052] Step S403: using the current oil pressure to correct the current friction torque of the engine to obtain a corrected current friction torque, and determining the corrected current friction torque as the engine friction torque to overcome, the engine friction torque to overcome includes a first engine friction torque to overcome and a second engine friction torque to overcome.

[0053] In order to achieve a more accurate determination of overcoming the engine friction torque, 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. The correction coefficient is multiplied by the current engine friction torque to obtain the corrected current friction torque.

[0054] In some embodiments of the present application, the control method for switching the mode of the parallel hybrid vehicle 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 ) 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 It represents the torque to overcome engine friction, T r Indicates the inertia torque of the engine rotation; determines the current engagement position of the clutch according to the current friction coefficient; if the current engagement position of the clutch is between the fully disengaged position and the first position, performs clutch engagement control according to the control logic of the first position.

[0055] Specifically, before determining the current engagement position of the clutch based on the current friction coefficient, the control method for switching the mode of the parallel hybrid vehicle in the present application also includes: obtaining the corresponding relationship between the friction coefficient and the clutch engagement position; determining the current engagement position of the clutch based on the current friction coefficient and the corresponding relationship between the friction coefficient and the clutch engagement position.

[0056] As mentioned above, the current friction coefficient has a corresponding relationship with the current engagement position of the clutch, which can be expressed as a curve;

[0057] That is to say, if the motor demand torque exceeds the motor maximum torque, it is necessary to use the preset relationship μ = (T max -T v ) / ( T f +T r ) determines the current friction coefficient, and then determines the current clutch engagement position based on the current friction coefficient, and then performs subsequent control logic based on the current clutch engagement position. Specifically, if the current clutch engagement position is between the fully disengaged position and the first position, the clutch engagement control is performed according to the control logic of the first position, and the motor output torque is reduced to meet the torque of the motor dragging the engine. When the speed reaches the injection speed, the clutch is disengaged, and the speed is increased by the engine injection;

[0058] The method also includes: if the current engagement position of the clutch is between the first position and the second position, controlling the engagement of the clutch according to the actual position. The determination of the motor-driven engine torque still follows the first formula and the second formula.

[0059] In some other embodiments of the present application, the control method for mode switching of the parallel hybrid vehicle in the present application also includes: presetting the fuel injection amount to maintain multiple engine speeds; determining 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 increase in fuel injection amount and the fuel injection amount corresponding to the current engine speed to obtain the summed fuel injection amount; and determining the smaller value of the summed 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 achieve mode switching while ensuring comfort and a short vehicle power interruption time.

[0060] Furthermore, the control method for mode switching of the parallel hybrid vehicle in the present application also includes: if in the gear shifting process, after the gear is disengaged, the clutch is fully engaged, the motor is controlled to drag the engine to rotate, and the motor drag torque is determined as the larger torque between the maximum torque of the motor and the drag torque obtained by looking up the table based on the oil pressure; after the engine speed rises to the engine injection speed, the motor is controlled to drag the engine while controlling the engine injection to increase the engine speed. Ensure that the power interruption time of the whole vehicle is short while completing the mode switching.

[0061] The above parallel hybrid vehicle mode switching control method 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 ECU (Electronic Control Unit), engine, clutch, drive motor / generator, gearbox, motor controller / MCU (Microcontroller Unit), TCU (Transmission Control Unit), power battery / BMS (Battery Management System), DC / AC (Direct Current / Alternating Current), electric power steering pump, shift panel, HCU and instrument.

[0062] The embodiment of the present application also provides a control device for mode switching of a parallel hybrid vehicle. It should be noted that the control device for mode switching of a parallel hybrid vehicle in the embodiment of the present application can be used to execute the control method for mode switching of a parallel hybrid vehicle provided in the embodiment of the present application. The device is used to implement the above-mentioned embodiments and preferred implementation modes, and those that have been explained will not be repeated. As used below, the term "module" can implement a combination of software and / or hardware for a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0063] The following is an introduction to the control device for mode switching of a parallel hybrid vehicle provided in an embodiment of the present application.

[0064] Figure 6 Schematic diagram of a control device for switching modes of a parallel hybrid vehicle according to an embodiment of the present application. Figure 6 As shown, the device comprises:

[0065] The first switching unit 61 is used for obtaining the current speed and torque of the motor if the gear shift process is not in progress, adjusting the output torque of the motor to be equal to the sum of the current torque of the motor and the torque of the first motor to drag the engine speed to a preset speed, and after the oil pressure rises with time and rises to the preset oil pressure, adjusting the output torque of the motor to be equal to the sum of the current torque of the motor and the torque of the second motor to drag the engine speed, so as to drag the engine speed to a difference between the current speed of the motor and the preset speed difference, so as to switch 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 fuel injection speed of the engine, the torque of the first motor to drag the engine is related to the preset speed, and the torque of the second motor to drag the engine is related to the current speed of the motor;

[0066] The second switching unit 62 is used to control the motor to drag the engine and increase the engine fuel injection amount to adjust the engine speed to a value less than the preset speed difference with the current speed of the motor when the gear selection is completed and the parallel hybrid vehicle has a gear shifting requirement, so as to switch the parallel hybrid vehicle from the pure electric mode to the hybrid mode.

[0067] The solution of the present application, for the situation that is not in the gear shifting process, by increasing the motor output torque multiple times, the engine speed is dragged to a difference with the current motor speed that is less than the preset speed difference to switch the parallel hybrid vehicle from pure electric mode to hybrid mode. During the whole process, the vehicle speed can be kept within an appropriate range to meet the comfort requirements of the vehicle during driving. For the situation that is in the gear shifting process, the motor drags the engine and increases the engine fuel injection amount to shorten the power interruption time of the vehicle.

[0068] In some embodiments of the present application, the device further includes a first determining unit and a second determining unit, wherein the first determining unit is configured to use a first formula T1=(T f1 +T r +T e1 ) / μ1 to determine the first motor drag engine torque; the second determination unit is used to use 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 drag engine torque and the second motor drag 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 . Among them, the torque transfer coefficient is related to the position of the clutch. The closer the clutch is to the fully engaged position, the greater the torque transfer coefficient, that is, the above μ2>μ1. It should be further explained that the torque that drags the engine speed to increase (including the first torque 1 that drags the engine speed to increase and the second torque that drags the engine speed to increase) is the torque that drags the engine speed to increase after overcoming the friction torque and inertia torque. The larger the value, the faster the engine speed increases.

[0069] In some embodiments of the present application, the device further includes a first acquisition unit, a third determination unit and a correction unit, wherein the first acquisition unit is used to acquire the mapping relationship between the engine speed, the engine water temperature and the engine friction torque; the third determination unit is used to determine the current engine friction torque according to the mapping relationship between the current engine speed, the current engine water temperature; the correction unit is used to correct the current engine friction torque using the current oil pressure to obtain the corrected current friction torque, and determine the corrected current friction torque as the torque to overcome the engine friction, and the torque to overcome the engine friction includes the first torque to overcome the engine friction and the second torque to overcome the engine friction. In order to achieve a more accurate determination of overcoming the engine friction torque, 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, and vice versa, the higher the oil pressure, the smaller the correction coefficient. Among them, the correction coefficient is multiplied by the current engine friction torque to obtain the corrected current friction torque.

[0070] In some embodiments of the present application, the device further includes a fourth determining unit, a fifth determining unit and a first control unit, wherein the fourth determining unit is used to determine, 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 Represents the inertia 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 perform clutch engagement control according to the control logic of the first position if the current engagement position of the clutch is between the fully disengaged position and the first position.

[0071] In some embodiments of the present application, the device further includes a second acquisition unit and a sixth determination unit, the second acquisition unit being used to acquire the corresponding relationship between the friction coefficient and the clutch engagement position before determining the current engagement position of the clutch according to the current friction coefficient; the sixth determination unit being used to determine the current engagement position of the clutch according to the current friction coefficient and the corresponding relationship between the friction coefficient and the clutch engagement position. As described above, the current friction coefficient and the current engagement position of the clutch have a corresponding relationship, which can be represented as a curve.

[0072] 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 used to pre-set the fuel injection amount to maintain multiple engine speeds; the seventh determination unit is used to determine the increase in fuel injection amount according to the difference between the target engine speed and the current engine speed; the third acquisition unit is used to obtain the sum of the increase in fuel injection amount and the fuel injection amount corresponding to the current engine speed to obtain the summed fuel injection amount; the eighth determination unit is used to determine the smaller value of the summed 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 achieve mode switching while ensuring comfort and a short vehicle power interruption time.

[0073] In some embodiments of the present application, the device also includes a second control unit and a third control unit. The second control unit is used to, if in the gear shifting process, fully engage the clutch after the gear is disengaged, control the motor to drag the engine to rotate, and determine the motor drag torque as the larger torque between the maximum torque of the motor and the drag torque obtained based on the oil pressure lookup table; the third control unit is used to control the motor to drag the engine while controlling the engine injection to increase the engine speed after the engine speed rises to the engine injection speed.

[0074] The control device for switching the mode of a parallel hybrid vehicle includes a processor and a memory. The first switching unit and the second switching unit are stored in the memory as program units, and the processor executes the program units stored in the memory to implement corresponding functions. The modules are all located in the same processor; or, the modules are located in different processors in any combination.

[0075] The processor includes a kernel, which retrieves the corresponding program unit from the memory. One or more kernels can be set, and the kernel parameters are adjusted to solve the problem of the vehicle speed being reduced and the vehicle power interruption time being long when the parallel hybrid vehicle switches from pure electric mode to hybrid mode in the prior art.

[0076] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0077] An embodiment of the present invention provides an electronic device, comprising: 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 any one of parallel hybrid vehicle mode switching.

[0078] An embodiment of the present invention provides a computer-readable storage medium, which includes a stored program, wherein when the program is running, a device where the computer-readable storage medium is located is controlled to execute a control method for parallel hybrid vehicle mode switching.

[0079] Specifically, the control method for parallel hybrid vehicle mode switching includes:

[0080] Step S101, if it is not in the gear shifting process, obtain the current speed and torque of the motor, adjust the output torque of the motor 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 speed of the engine to a preset speed, and after the oil pressure rises over time and rises to the preset oil pressure, adjust the output torque of the motor 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 speed of the engine to a difference between the current speed of the motor and the preset speed difference, so as to switch 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 fuel injection speed of the engine, 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 speed of the motor;

[0081] Step S102, if it is in the gear shifting process, when the gear selection is completed and the parallel hybrid vehicle has a gear shifting requirement, the motor is controlled to drag the engine and the engine fuel injection amount is increased to adjust the engine speed to a difference with the current motor speed that is less than the preset speed difference to switch the parallel hybrid vehicle from pure electric mode to hybrid mode.

[0082] Optionally, the method further comprises: using a first formula T1=(T f1 +T r +T e1 ) / μ1 to determine 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 drag engine torque and the second motor drag 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 .

[0083] Optionally, the above method also includes: obtaining a mapping relationship between engine speed, engine water temperature and engine friction torque; determining the current engine friction torque based on the current engine speed, the current engine water temperature and the above mapping relationship; using the current oil pressure to correct the current engine friction torque to obtain a corrected current friction torque, and determining the corrected current friction torque as the torque to overcome the engine friction, and the above-mentioned overcoming engine friction torque includes the above-mentioned first overcoming engine friction torque and the above-mentioned second overcoming engine friction torque.

[0084] Optionally, 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 above motor, T v Indicates the current torque of the above motor, T f Indicates the torque to overcome engine friction, T rIndicates the inertia torque of the engine rotation; determines the current engagement position of the clutch based on the above current friction coefficient; if the above current engagement position of the clutch is between the fully disengaged position and the above first position, performs clutch engagement control according to the control logic of the above first position.

[0085] Optionally, before determining the current engagement position of the clutch based on the current friction coefficient, the method further includes: obtaining the correspondence between the friction coefficient and the clutch engagement position; determining the current engagement position of the clutch based on the current friction coefficient and the correspondence between the friction coefficient and the clutch engagement position.

[0086] Optionally, the method further includes: pre-setting the fuel injection amount for maintaining various engine speeds; determining to increase the fuel injection amount based on 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 obtain the added fuel injection amount; and determining the smaller value between the added fuel injection amount and the maximum allowable fuel injection amount as the final fuel injection amount.

[0087] Optionally, the above method also includes: if it is in the above gear shifting process, the clutch is fully engaged after the gear is disengaged, the motor is controlled to drag the engine to rotate, and the motor drag torque is determined as the larger torque between the maximum torque of the motor and the drag torque obtained based on the oil pressure lookup table; after the speed of the above engine rises to the above engine injection speed, the motor is controlled to drag the engine while controlling the engine injection to increase the engine speed.

[0088] An embodiment of the present invention provides a processor, which is used to run a program, wherein the program executes a control method for parallel hybrid vehicle mode switching when running.

[0089] Specifically, the control method for parallel hybrid vehicle mode switching includes:

[0090] Step S101, if it is not in the gear shifting process, obtain the current speed and torque of the motor, adjust the output torque of the motor 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 speed of the engine to a preset speed, and after the oil pressure rises over time and rises to the preset oil pressure, adjust the output torque of the motor 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 speed of the engine to a difference between the current speed of the motor and the preset speed difference, so as to switch 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 fuel injection speed of the engine, 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 speed of the motor;

[0091] Step S102, if it is in the gear shifting process, when the gear selection is completed and the parallel hybrid vehicle has a gear shifting requirement, the motor is controlled to drag the engine and the engine fuel injection amount is increased to adjust the engine speed to a difference with the current motor speed that is less than the preset speed difference to switch the parallel hybrid vehicle from pure electric mode to hybrid mode.

[0092] An embodiment of the present invention provides a device, the device including a processor, a memory, and a program stored in the memory and executable on the processor, and when the processor executes the program, at least the following steps are implemented:

[0093] Step S101, if it is not in the gear shifting process, obtain the current speed and torque of the motor, adjust the output torque of the motor 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 speed of the engine to a preset speed, and after the oil pressure rises over time and rises to the preset oil pressure, adjust the output torque of the motor 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 speed of the engine to a difference between the current speed of the motor and the preset speed difference, so as to switch 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 fuel injection speed of the engine, 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 speed of the motor;

[0094] Step S102, if it is in the gear shifting process, when the gear selection is completed and the parallel hybrid vehicle has a gear shifting requirement, the motor is controlled to drag the engine and the engine fuel injection amount is increased to adjust the engine speed to a difference with the current motor speed that is less than the preset speed difference to switch the parallel hybrid vehicle from pure electric mode to hybrid mode.

[0095] The devices in this article can be servers, PCs, PADs, mobile phones, etc.

[0096] The present application also provides a computer program product, which, when executed on a data processing device, is suitable for executing a program for initializing at least the following method steps:

[0097] Step S101, if it is not in the gear shifting process, obtain the current speed and torque of the motor, adjust the output torque of the motor 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 speed of the engine to a preset speed, and after the oil pressure rises over time and rises to the preset oil pressure, adjust the output torque of the motor 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 speed of the engine to a difference between the current speed of the motor and the preset speed difference, so as to switch 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 fuel injection speed of the engine, 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 speed of the motor;

[0098] Step S102, if it is in the gear shifting process, when the gear selection is completed and the parallel hybrid vehicle has a gear shifting requirement, the motor is controlled to drag the engine and the engine fuel injection amount is increased to adjust the engine speed to a difference with the current motor speed that is less than the preset speed difference to switch the parallel hybrid vehicle from pure electric mode to hybrid mode.

[0099] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general 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 a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0100] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0101] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0102] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0103] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0104] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0105] 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 read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0106] 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 tape 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.

[0107] 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.

[0108] 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 it is not in the gear shifting process, the current speed and torque of the motor are obtained, and the output torque of the motor is adjusted to be equal to the sum of the current torque of the motor and the torque of the first motor to drag the engine to the preset speed. After the oil pressure rises over time and rises to the preset oil pressure, the output torque of the motor is adjusted to be equal to the sum of the current torque of the motor and the torque of the second motor to drag the engine to a speed difference with 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 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 it is in the gear shifting process, when the gear selection is completed and the parallel hybrid vehicle has a gear shifting requirement, the motor is controlled to drag the engine while increasing the engine fuel injection amount to adjust the engine speed to a difference with 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.

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 by 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 2, characterized in that: The method further comprises: 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 It represents 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.

5. The method according to claim 4, 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.

6. 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.

7. The method according to claim 1, characterized in that The method further comprises: If the gear shift process is in progress, the clutch is fully engaged after the gear is disengaged, the motor is controlled to drag the engine to rotate, and the motor drag torque is determined as the larger torque between the maximum torque of the motor and the drag torque obtained by looking up the table based on the oil pressure; After the speed of the engine rises to the engine injection speed, the motor is controlled to drag the engine while the engine injection is controlled to increase the engine speed.

8. A control device for switching modes of a parallel hybrid vehicle, characterized in that: include: A first switching unit is used for obtaining the current speed and torque of the motor if the gear shift process is not in progress, adjusting the output torque of the motor to be equal to the sum of the current torque of the motor and the torque of the first motor to drag the engine speed to a preset speed, and after the oil pressure rises with time and rises to the preset oil pressure, adjusting the output torque of the motor to be equal to the sum of the current torque of the motor and the torque of the second motor to drag the engine speed, so as to drag the engine speed to a difference with the current speed of the motor that is less than a preset speed difference, so as to switch the parallel hybrid vehicle from a pure electric mode to a hybrid mode, wherein the preset speed is less than the current speed of the motor and greater than the fuel injection speed of the engine, the torque of the first motor to drag the engine is related to the preset speed, and the torque of the second motor to drag the engine is related to the current speed of the motor; The second switching unit is used to control the motor to drag the engine and increase the engine fuel injection amount to adjust the engine speed to a value less than the preset speed difference from the current speed of the motor, so as to switch the parallel hybrid vehicle from the pure electric mode to the hybrid mode when the gear selection is completed and the parallel hybrid vehicle has a gear shifting requirement.

9. 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 mode switching of a parallel hybrid vehicle according to any one of claims 1 to 7.

10. 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 7.

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