Vehicle mode switching method and device and vehicle

Abstract

The invention discloses a vehicle mode switching method and device and a vehicle, which can improve the coordination of a control system so as to reduce the power interruption time. The vehicle mode switching method comprises the steps that when a vehicle mode switching demand exists, a vehicle load, vehicle gear shifting information, a vehicle current control mode and a vehicle target control mode are obtained; according to the vehicle load, the vehicle current control mode and the vehicle target control mode, a cooperative strategy of gear shifting and vehicle control mode switching is determined; wherein the cooperation strategy comprises a neutral position mode switching strategy and an in-gear mode switching strategy; and gear shifting and vehicle control mode switching are controlled according to the cooperation strategy and the vehicle gear shifting information.

Description

Technical Field

[0001] The present application relates to the technical field of vehicles, and particularly to a method, a device and a vehicle for vehicle mode switching. Background Art

[0002] In today's society, with the increasing awareness of environmental protection and the more prominent energy problems, the automotive industry is undergoing a profound transformation and accelerating its development towards energy conservation, emission reduction, high efficiency and environmental protection. As an innovative means of transportation that combines the advantages of traditional fuel engines and electric motors, hybrid vehicles have emerged and gradually become a research hotspot and development focus in the automotive field. Hybrid vehicles usually have multiple operating modes to adapt to different driving conditions and driving requirements. The most common ones include pure electric mode, hybrid mode and engine mode. In addition, the hybrid system involves a shifting process, which has a power interruption and a torque addition and subtraction control process. Performing mode switching during the shifting process can improve vehicle comfort. However, if the mode switching time is too long, it may lead to a long power interruption time. During this period, the vehicle is in a powerless state and may even experience a short pause, which will not only reduce driving comfort but also may affect driving safety. Summary of the Invention

[0003] In order to solve the above technical problems, the present application is proposed. Embodiments of the present application provide a method, a device and a vehicle for vehicle mode switching, which can improve the coordination of the control system to reduce the power interruption time.

[0004] According to a first aspect of the present application, there is provided a method for vehicle mode switching, including: when there is a vehicle mode switching requirement, obtaining vehicle load, vehicle shifting information, vehicle current control mode and vehicle target control mode; determining a collaborative strategy for shifting and vehicle control mode switching according to the vehicle load, the vehicle current control mode and the vehicle target control mode; wherein the collaborative strategy includes a neutral mode switching strategy and an in-gear mode switching strategy; controlling shifting and vehicle control mode switching according to the collaborative strategy and the vehicle shifting information.

[0005] As a possible implementation manner, the vehicle gear shifting information includes current gear information and target gear information. According to the in-gear mode switching strategy and the vehicle gear shifting information, the gear shifting and the vehicle control mode switching are controlled, including: shifting gears according to the current gear information and the target gear information; wherein, the process of shifting gears includes torque clearing, gear disengaging, motor speed regulation, and gear engaging; before torque clearing, controlling the starter to start the engine; during torque clearing and gear disengaging, adjusting the engine speed and the motor speed based on the target speed; wherein, the target speed is calculated based on the vehicle speed and the target gear information; when the engine speed and the motor speed meet the preset conditions, controlling the clutch to close to complete the gear shifting and the vehicle control mode switching.

[0006] As a possible implementation manner, when the engine speed and the motor speed meet the preset conditions, controlling the clutch to close includes: when the difference between the engine speed and the motor speed is less than or equal to the first preset difference, and the difference between the engine speed and the target speed is less than or equal to the second preset difference, and the difference between the motor speed and the target speed is less than or equal to the third preset difference, controlling the clutch to close.

[0007] As a possible implementation manner, according to the neutral gear mode switching strategy and the vehicle gear shifting information, the gear shifting and the vehicle control mode switching are controlled, including when the actual gear of the gearbox is in neutral, controlling the clutch to close; when the clutch is closed, controlling the motor to reverse-drag to start the engine; when the engine starts, controlling the motor to adjust the speed and engage the gear to complete the gear shifting and the vehicle control mode switching.

[0008] As a possible implementation manner, according to the vehicle load, the current vehicle control mode, and the target vehicle control mode, a collaborative strategy for gear shifting and vehicle control mode switching is determined, including: when the vehicle load is less than the preset load, according to the current vehicle control mode and the target vehicle control mode, determining that the collaborative strategy for gear shifting and vehicle control mode switching is the neutral gear mode switching strategy.

[0009] As a possible implementation manner, when the vehicle load is less than the preset load, according to the current vehicle control mode and the target vehicle control mode, determining that the collaborative strategy for gear shifting and vehicle control mode switching is the neutral gear mode switching strategy includes: when the current vehicle control mode is the pure electric control mode, and the target vehicle control mode is the hybrid power control mode, and the vehicle load is less than the preset load, determining that the collaborative strategy is the neutral gear mode switching strategy.

[0010] As a possible implementation, a collaborative strategy for gear shifting and vehicle control mode switching is determined according to the vehicle load, the current vehicle control mode, and the target vehicle control mode, including: when the vehicle load is greater than or equal to a preset load, a collaborative strategy for gear shifting and vehicle control mode switching is determined as an in-gear mode switching strategy according to the current vehicle control mode and the target vehicle control mode.

[0011] As a possible implementation, when the vehicle load is greater than or equal to a preset load, a collaborative strategy for gear shifting and vehicle control mode switching is determined as an in-gear mode switching strategy according to the current vehicle control mode and the target vehicle control mode, including: when the current vehicle control mode is a pure electric control mode, the target vehicle control mode is a hybrid power control mode, and the vehicle load is greater than or equal to a preset load, the collaborative strategy is determined as an in-gear mode switching strategy; or when the current vehicle control mode is a hybrid power control mode, the target vehicle control mode is a hybrid power control mode, and the vehicle load is greater than or equal to a preset load, the collaborative strategy is determined as an in-gear mode switching strategy.

[0012] According to a second aspect of the present application, a vehicle mode switching device is provided, including: an acquisition module for acquiring vehicle load, vehicle gear shifting information, the current vehicle control mode, and the target vehicle control mode when there is a vehicle mode switching requirement; a determination module for determining a collaborative strategy for gear shifting and vehicle control mode switching according to the vehicle load, the current vehicle control mode, and the target vehicle control mode; wherein the collaborative strategy includes a neutral gear mode switching strategy and an in-gear mode switching strategy; a control module for controlling gear shifting and vehicle control mode switching according to the collaborative strategy and the vehicle gear shifting information.

[0013] According to a third aspect of the present application, a vehicle is provided, including: a gearbox, a clutch, a motor, and an engine; the vehicle mode switching device as described in the second aspect or any one of the implementation manners of the second aspect, and the vehicle mode switching device is communicatively connected to the gearbox, the clutch, the motor, and the engine.

[0014] The vehicle mode switching method, device, and vehicle provided by the present application can perform mode switching while shifting gears, switch the current vehicle control mode to the target vehicle control mode, and select a suitable mode switching strategy according to the vehicle load to quickly and efficiently complete the collaborative control of mode switching and gear shifting, optimize vehicle comfort, and improve the rapidity of mode switching while ensuring power performance. Description of the Drawings

[0015] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on the provided drawings.

[0016] Figure 1 It is a structural diagram of the transmission system of a hybrid vehicle provided by an exemplary embodiment of the present application.

[0017] Figure 2 It is a schematic flowchart of a method for vehicle mode switching provided by an exemplary embodiment of the present application.

[0018] Figure 3 It is a schematic flowchart of the shift control process in pure electric mode provided by an exemplary embodiment of the present application.

[0019] Figure 4 It is a schematic flowchart of the neutral mode switching strategy provided by an exemplary embodiment of the present application.

[0020] Figure 5 It is a schematic flowchart of the in-gear mode switching strategy provided by an exemplary embodiment of the present application.

[0021] Figure 6 It is a schematic structural diagram of a device for vehicle mode switching provided by an exemplary embodiment of the present application.

[0022] Description of reference numerals: 101 - engine; 102 - clutch; 103 - drive motor / generator; 104 - gearbox; 105 - ECU; 106 - auxiliary controller DCAC / DCDC; 107 - power battery / BMS; 108 - battery; 109 - MCU; 110 - TCU / CCU; 111 - instrument; 112 - shift lever; 113 - HCUs; 114 - electric power steering pump. Detailed implementation manners

[0023] Next, the exemplary embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. It should be understood that the present application is not limited by the exemplary embodiments described herein.

[0024] Hybrid vehicles usually have multiple operating modes to adapt to different driving conditions and driver needs. The most common ones include pure electric mode, hybrid mode, and engine mode. In pure electric mode, the vehicle is powered solely by the electric motor, which has significant advantages of zero emissions and low noise in scenarios such as low-speed driving, short trips, or when high quietness is required. It can effectively reduce environmental pollution and provide a quiet driving environment for passengers. In hybrid mode, the engine and the electric motor work together, and according to the vehicle's real-time power demand, the output power of the two is intelligently distributed to give full play to their performance characteristics. While ensuring sufficient power, it realizes efficient energy utilization, reduces fuel consumption and exhaust emissions. The engine mode mainly comes into play when the vehicle is driving at high speed or requires high power output. The engine directly drives the vehicle to ensure that the vehicle has sufficient power performance to handle various complex road conditions.

[0025] The mechanical power system of traditional vehicles is from the fuel tank - engine - transmission - final drive to the wheels. In addition to the traditional mechanical power system, the hybrid vehicle drive system adds an electric circuit power system of battery - motor - transmission - final drive - wheels. Figure 1 It is the structural diagram of the drive system of a hybrid vehicle provided by an exemplary embodiment of the present application. The following combines Figure 1 to introduce the drive system structure of the hybrid vehicle in more detail. As Figure 1As shown in the figure, the powertrain of a hybrid vehicle includes: Engine 101: As a traditional power source, it generates power by burning fuel and provides the basic driving force for the vehicle. Clutch 102: Used to connect or disconnect the power transmission between Engine 101 and the drive motor / generator 103, enabling the flexible combination and separation of Engine 101 and the power system. Drive motor / generator 103: Has a dual function. It can act as a motor to drive the vehicle, and can also act as a generator to recover energy when the vehicle brakes or decelerates, converting mechanical energy into electrical energy for storage. Transmission 104: A variable ratio transmission mechanism that can be operated by a shift mechanism, capable of amplifying and reducing the rotational speed and torque of the input shaft or output shaft. By changing the rotational speed and torque output by the drive motor / generator 103 and Engine 101, it adapts to different driving conditions, enabling the vehicle to operate efficiently under various speed and load conditions. Electric power steering pump 114: Provides assistance to the vehicle's steering system, reducing the driver's steering operation force and improving driving comfort and safety. ECU (Electronic Control Unit) 105, used to control the driving state of the vehicle and implement its various functions. Auxiliary controller DCAC / DCDC 106: Responsible for converting the high-voltage direct current of the power battery into alternating current or low-voltage direct current suitable for devices such as the electric power steering pump 114, realizing the conversion and distribution of electrical energy. Power battery / BMS (Battery Management System) 107: Stores and provides the electrical energy required for vehicle operation. The BMS is responsible for monitoring and managing the state of the power battery, including parameters such as the charging and discharging process, temperature, and voltage of the battery, ensuring the safe and efficient operation of the battery. Battery 108: Provides electrical energy for the vehicle's low-voltage systems (such as the instrument panel 111, control unit, etc.), ensuring the normal operation of these systems. MCU (Motor Controller) 109: Controls the operation of the drive motor / generator 103, precisely adjusting the rotational speed, torque, and power output of the motor according to the vehicle's driving requirements and the driver's operation instructions. TCU (Transmission Control Unit) / CCU (Chassis Control Unit) 110: The TCU is responsible for controlling the shift timing and shift process of the transmission 104 to achieve the optimal gear ratio; the CCU coordinates the vehicle's chassis system, including braking, suspension, etc., ensuring the stability and controllability of the vehicle. Instrument panel 111: Displays various operating information of the vehicle, such as vehicle speed, battery level, fault alerts, etc., providing the driver with intuitive vehicle status feedback. Shift lever 112: The driver operates the shift lever 112 to select the vehicle's driving mode (such as forward gear, reverse gear, neutral gear, etc.) and shift timing. HCU (Hybrid Control Unit) 113: As the core control unit of the hybrid system, it coordinates the work of various components such as Engine 101, drive motor / generator 103, and transmission 104, achieving the optimal performance and energy management of the hybrid system.

[0026] In addition, as Figure 1 shown, the CAN signal is marked in many places in the figure. The CAN (Controller Area Network) bus is a network protocol used for communication between various electronic control units inside the vehicle. Through the CAN bus, each control unit (such as HCU, MCU, TCU, etc.) can exchange information in real time to achieve collaborative work. The high-voltage harness is used to connect high-voltage components such as the power battery, drive motor / generator, and electric power steering pump, and is used to transmit high-voltage electrical energy. The low-voltage harness is used to connect low-voltage components such as the battery, instrument, and control unit, and is used to transmit low-voltage signals and electrical energy. The engine, clutch, drive motor / generator, and transmission are connected through mechanical transmission devices (such as shafts, gears, etc.) to achieve power transmission and conversion. This structure and connection method enable the hybrid vehicle to give full play to the advantages of the engine and the electric motor, and achieve efficient, energy-saving, and environmentally friendly driving performance.

[0027] Take Figure 1 as an example of a single-motor parallel hybrid heavy truck. During operation, it is not limited to the simple switching of several modes. Its hybrid system also involves a complex gear-shifting process. During vehicle driving, there will be gear-shifting operations. Gear-shifting can keep the engine and the electric motor at the best working efficiency at different speeds, thereby optimizing the vehicle's power output and fuel economy. However, the gear-shifting process is not completed instantaneously, and there are power interruption and torque addition and subtraction control processes. Power interruption means that at the moment of gear-shifting, the power transmission path changes, resulting in the vehicle losing power output for a short time, which may bring a sense of jerk to the driver and affect the smoothness of driving. The torque addition and subtraction control process refers to that in order to achieve smooth gear-shifting, it is necessary to precisely adjust the torque of the engine and the electric motor, appropriately reduce the torque before gear-shifting to reduce the impact on the transmission system, and quickly restore the torque after gear-shifting to ensure the vehicle's power performance.

[0028] In order to further improve the comfort of the vehicle, mode switching during the shifting process has become an effective technical means. By reasonably selecting the timing and method of mode switching, the torque output of the engine and the motor can be transitioned more smoothly, reducing the impact of power interruption on driving experience. However, a long mode switching time may bring a series of problems. When the mode switching time is too long, the power interruption time will also be extended accordingly. During this period, the vehicle is in a powerless state, and the driver will obviously feel that the vehicle's power response slows down, and there may even be a short pause, which will not only reduce driving comfort, but also affect driving safety, especially when rapid acceleration or overtaking is required. In addition, too long mode switching time may also cause the torque output of the engine and the motor to be uncoordinated, further aggravating the fluctuation of power output, causing the vehicle to have obvious shaking or setbacks. The root cause of the long mode switching time and power interruption problem lies in the incoordination of the control system. The incoordination of the control system may cause delays or deviations in the execution of the mode switching command, resulting in a long mode switching time, aggravated power interruption problems, and ultimately affecting the vehicle's drivability and comfort.

[0029] Based on this, the present application proposes a vehicle, which uses the vehicle mode switching device provided by the present application, and the vehicle mode switching device is connected to the gearbox, clutch, motor and engine in communication. The method for implementing vehicle mode switching can determine the control process of mode switching occurring in different shifting processes based on vehicle load and vehicle shifting information, and determine the mode switching method according to the vehicle state, optimize vehicle comfort and the rapidity of mode switching, improve the efficiency of mode switching, and reduce the negative impact caused by excessive power interruption time.

[0030] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions 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 are within the scope of protection of this application.

[0031] To solve the problem of long mode switching time and uncoordinated control system, a vehicle mode switching method is proposed below. Figure 2 is a flow chart of a method for switching vehicle modes provided by an exemplary embodiment of the present application. Figure 2 For example, first, when there is a need to switch the vehicle mode, obtain the vehicle load, vehicle shift information, vehicle current control mode and vehicle target control mode (see Figure 2(S210). The vehicle shift information may include the shift stage of the vehicle, the current gear of the vehicle, and the target gear of the vehicle. When there is a need for mode switching in different shift stages, the vehicle load is used as the decision-making basis to control the hybrid system to quickly and efficiently complete the coordinated control of mode switching and shifting. Then, according to the vehicle load, the current vehicle control mode, and the target vehicle control mode, a coordinated strategy for shifting and vehicle control mode switching is determined (see Figure 2 (S220). Among them, the coordinated strategy includes a neutral gear mode switching strategy and an in-gear mode switching strategy. Finally, according to the coordinated strategy and the vehicle shift information, shifting and vehicle control mode switching are controlled (see Figure 2 (S230). It can be understood that this application can be applied to the situation where shifting and mode switching occur simultaneously, or the situation where there is a need for mode switching during the shifting process. Therefore, the vehicle control mode can be quickly switched during shifting, improving the coordination of the control system to reduce the power interruption time and enhance the drivability and comfort of the vehicle.

[0032] The following combines Figure 2 to introduce the method for vehicle mode switching provided by the embodiments of this application in more detail.

[0033] In S210, when there is a need for vehicle mode switching, the vehicle load, the vehicle shift information, the current vehicle control mode, and the target vehicle control mode are obtained.

[0034] In some embodiments, the control modes of the vehicle are divided into a pure electric control mode, an engine control mode, and a hybrid power control mode. Among them, when the motor drives the vehicle alone, it is called the pure electric control mode. When the engine drives the vehicle alone, it is called the engine control mode. When both drive the vehicle together, it is called the hybrid power control mode. The current vehicle control mode and the target vehicle control mode are one of the control modes of the vehicle.

[0035] In some embodiments, in the pure electric control mode, Figure 3 is a schematic flowchart of the shift control process in the pure electric mode provided by an exemplary embodiment of this application. The shift control process of the vehicle is as Figure 3 shown. The shift process is as follows: At the beginning, first, the motor clears torque (see Figure 3 (S31). Then, the gear shift actuator of the gearbox performs a gear disengaging action (see Figure 3 (S32). Next, after the actual gear of the gearbox is in neutral, according to the current vehicle speed, the motor adjusts the speed of the input shaft of the gearbox to the target speed, that is, performs motor speed regulation (see Figure 3 (S33). Finally, the actuator of the gearbox performs a gear engaging (see Figure 3 (S34) action to complete the gear shift and end.

[0036] In some embodiments, when there is a need to switch the vehicle mode during the gear shifting process of the vehicle, the gear shifting stage of the vehicle is obtained. If the gear shifting stage of the vehicle is during the torque clearing and gear disengaging process and the vehicle load is less than a preset load, it is determined that the cooperation strategy is a neutral gear mode switching strategy. For example, due to a low battery SOC, a pure electric mode failure, or a large power demand, etc., a demand for switching to the hybrid mode will be triggered, and this demand may occur during any process of gear shifting. For demands occurring at different stages, different mode switching control methods are selected. For example, when the vehicle load resistance is small, if the mode switching demand occurs during the torque clearing and gear disengaging process, the neutral gear mode switching strategy is directly adopted. If the vehicle load resistance is large, first perform gear shifting, start the engine with the starter synchronously, the transmission and the battery continuously execute the gear shifting process, and the engine speed is adjusted to prepare for closing the clutch to complete the mode switching. At this time, the shortest time for gear shifting and mode switching can be ensured.

[0037] In some embodiments, the vehicle load calculation process can adopt Formula 1: Formula 1; In Formula 1, represents the air resistance (wind resistance). When the vehicle is traveling at a high speed, the air resistance is proportional to the square of the speed. The air resistance is the main resistance in the high-speed section. represents the air resistance coefficient (dimensionless), which reflects the degree of influence of the vehicle shape on the air resistance. The smaller the coefficient, the smaller the air resistance the vehicle receives during driving. represents the air density, with the unit of kilograms per cubic meter (kg / m³). The air density depends on environmental conditions such as altitude, temperature, and humidity, etc. represents the vehicle frontal area (m²), that is, the vehicle's front projection area. represents the vehicle speed (m / s). represents the gradient resistance (gravity component). The gradient resistance is the gravity component that the vehicle needs to overcome when going uphill and is negative when going downhill. The gradient refers to the road gradient on which the vehicle travels and can be divided into uphill and downhill. During the vehicle's forward movement, the required power of the whole vehicle increases when going uphill and decreases when going downhill. represents the total vehicle mass (kg). The total vehicle mass refers to the curb weight of the whole vehicle when unloaded and the cargo loading mass. represents the acceleration due to gravity (m / s²), usually taking a value of 9.81 m / s². represents the road surface gradient angle (in radians). represents the rolling resistance. The rolling resistance is the resistance caused by tire deformation, road surface friction, etc., and slightly increases with the speed. Represents the constant part in the rolling resistance coefficient, dimensionless, mainly related to the tire material, structure, and road surface condition, reflecting the rolling resistance between the tire and the road surface when the vehicle is stationary or moving at a low speed. Represents the speed-dependent rolling resistance coefficient, with the unit of seconds per meter (s / m), taking into account the influence of speed on the rolling resistance. As the speed increases, the rolling resistance will change. Represents the slope correction term (which can be approximated as 1 when the slope is small). Represents the acceleration resistance (inertial force). The acceleration resistance is the inertial force that the vehicle needs to overcome when accelerating, and it is negative when decelerating. δ Represents the rotating mass conversion coefficient, dimensionless. Since when the vehicle is accelerating or decelerating, in addition to the translational mass, rotating components (such as wheels, transmission systems, etc.) will also generate inertial forces. δ Is used to equivalently convert the inertial effect of the rotating mass into the inertial effect of the translational mass. Represents the vehicle acceleration (m / s²).

[0038] In S220, according to the vehicle load, the current vehicle control mode, and the target vehicle control mode, determine the coordinated strategy for gear shifting and vehicle control mode switching.

[0039] The coordinated strategy for gear shifting and vehicle control mode switching includes: neutral gear mode switching strategy and in-gear mode switching strategy. Among them, the neutral gear mode switching strategy means that when the actual gear of the transmission is in neutral, perform mode switching. Performing mode switching in neutral means that after removing the gear, close the clutch, and the motor and the engine jointly drive the vehicle. After removing the gear and closing the clutch, the motor and the engine can be regarded as an integrated unit, so there is no need to switch the hybrid mode during driving, thereby reducing the impact caused by the engine intervention during the clutch closing process and improving comfort. The in-gear mode switching strategy means that for the case of large load resistance, the neutral gear mode switching strategy cannot be used. At this time, it is necessary to execute the in-gear mode switching strategy. First, shift gears to ensure the normal output of the motor torque and ensure the vehicle power performance. At the same time, the engine starts in advance for speed regulation, and the clutch is closed near the slip point. After waiting for the gear shifting to be completed, quickly complete the mode switching.

[0040] In some embodiments, during the gear shifting process, the actual gear of the transmission is in neutral, and at this time, the torque transmission of the power system is interrupted. If the motor is used to reverse-drag and start the engine at this time, completing the mode switching will not affect the vehicle. Therefore, when the current vehicle control mode is the pure electric control mode, the target vehicle control mode is the hybrid power control mode, and the vehicle load is less than the preset load, determine the coordinated strategy as the neutral gear mode switching strategy. Enable the neutral gear mode switching strategy. After removing the gear from the transmission, start the engine by reverse-dragging with the motor through closing the clutch. After the engine starts, shift gears through motor speed regulation to complete the mode switching.

[0041] In some other embodiments, when the vehicle load is greater than or equal to a preset load, according to the current vehicle control mode and the target vehicle control mode, the collaborative strategy for gear shifting and vehicle control mode switching is determined as the in-gear mode switching strategy. Although the mode switching can be completed during the gear shifting process, when the vehicle is under a relatively large load resistance (such as climbing a slope or having a heavy load itself), if the mode is switched at this time, the power interruption time is relatively long and the driving comfort is poor. In addition, the vehicle may slip backward during the climbing process, affecting driving safety. Therefore, for the case of large load resistance, in-gear mode switching is required. In the in-gear mode, in order to improve the synchronization efficiency, the engine can be started by the starter before torque clearing. During torque clearing and gear shifting, the engine continuously adjusts its speed with the target speed as the target, and at the same time, the motor also synchronously adjusts its speed according to the target speed. After the engine speed adjustment is completed and the gear shifting is completed, the clutch is closed to directly complete the mode switching. Prioritizing gear shifting ensures power performance. At this time, when power performance can be ensured, the mode switching is quickly completed, ensuring driving safety and the high efficiency of mode switching, and completing the coordination of gear shifting and mode switching.

[0042] To further increase the mode switching efficiency, after the engine is successfully started, the clutch can also be controlled to close close to the slip friction point. When the speed adjustments of both the engine and the motor are completed, the clutch is directly closed to complete gear shifting and mode switching.

[0043] As a possible implementation, when the current vehicle control mode is the pure electric control mode, the target vehicle control mode is the hybrid power control mode, and the vehicle load is greater than or equal to the preset load, the collaborative strategy is determined as the in-gear mode switching strategy; or when the current vehicle control mode is the hybrid power control mode, the target vehicle control mode is the hybrid power control mode, and the vehicle load is greater than or equal to the preset load, the collaborative strategy is determined as the in-gear mode switching strategy. The mode switching may occur during the process of electric-to-hybrid or hybrid-to-hybrid. Therefore, the engine can be started by the starter, and speed adjustment can be carried out in advance to prevent the engine from not being able to keep up with the speed of the motor.

[0044] In S230, according to the collaborative strategy and the vehicle gear shifting information, control the gear shifting and the vehicle control mode switching.

[0045] As a possible implementation of controlling the gear shifting and the vehicle control mode switching according to the neutral gear mode switching strategy and the vehicle gear shifting information, when the actual gear of the transmission is in neutral, control the clutch to close; when the clutch is closed, control the motor to reverse-drag and start the engine, and when the engine is started, control the motor to adjust the speed and shift gears.

[0046] Figure 4 is a schematic flow chart of the neutral gear mode switching strategy provided by an exemplary embodiment of the present application, with Figure 4For example, when performing a mode switch in neutral, start by first clearing the torque (see S41 in Figure 4 ), then shift out of gear (see S42 in Figure 4 ), confirm whether there is a need for a mode switch (see S43 in Figure 4 ). If there is, close the clutch (see S44 in Figure 4 ), then the motor drags the engine in reverse (see S45 in Figure 4 ), then adjust the motor speed (see S46 in Figure 4 ), shift gears (see S47 in Figure 4 ), and finally end. If there is no need for a mode switch, directly execute S46 and S47, that is, the shift control in pure electric mode.

[0047] The vehicle shift information includes the current gear information and the target gear information. As a possible implementation of controlling gear shifting and vehicle control mode switching based on the in-gear mode switching strategy and vehicle shift information, shift gears according to the current gear information and the target gear information; among them, the process of shifting gears includes clearing the torque, shifting out of gear, adjusting the motor speed, and shifting gears; before clearing the torque, control the starter to start the engine; during the process of clearing the torque and shifting out of gear, adjust the engine speed and motor speed based on the target speed; among them, the target speed is calculated based on the vehicle speed and the target gear information, for example, by reverse calculating the target speed through the vehicle speed and the target gear. When the engine speed and the motor speed meet the preset conditions, control the clutch to close. That is to say, starting the engine in advance by the starter can increase the speed regulation efficiency, and then during the process of clearing the torque and shifting out of gear in the shift process, continuously adjust the engine speed to approach the target speed, and the motor simultaneously adjusts the speed to approach the target speed. Completing the speed regulation in advance can accelerate the clutch closing speed, so the clutch is closed when the speeds of the engine and the motor are synchronized.

[0048] As a possible implementation, the engine speed and the motor speed meeting the preset conditions can be set as: when the difference between the engine speed and the motor speed is less than or equal to the first preset difference, and the difference between the engine speed and the target speed is less than or equal to the second preset difference, and the difference between the motor speed and the target speed is less than or equal to the third preset difference, control the clutch to close. The numerical values of the first preset difference, the second preset difference, and the third preset difference can be the same or different.

[0049] For example, the target gear is the 6th gear and 3000 revolutions are required. Before shifting gears at 2800 revolutions, start the engine by the starter, take 3000 revolutions as the target, synchronously adjust the engine speed and the motor speed, and start adjusting the engine speed during the process of clearing the torque and shifting out of gear. Then the motor also adjusts the speed with 3000 revolutions as the target. When the engine speed regulation and the motor speed regulation are both completed and the gear shifting is completed, close the clutch and execute the online mode switching strategy.

[0050] Figure 5 is a schematic flowchart of a gearshift mode switching strategy provided by an exemplary embodiment of the present application. Taking Figure 5 as an example, at the beginning, first, the gearshift process includes torque clearing (see S51 in Figure 5 ), gear disengaging (see S52 in Figure 5 ), motor speed regulation (see S53 in Figure 5 ), and gear engaging (see S54 in Figure 5 ). This gearshift process is synchronized with the mode switching process. Before executing S51 - S54, it is confirmed whether there is a mode switching requirement (see S55 in Figure 5 ). If there is, then the starter / generator is started before S51 (see S56 in Figure 5 ). When the engine starts successfully (see S57 in Figure 5 ), the clutch is closed near the slip point (see S58 in Figure 5 ) to quickly complete the closing of the clutch subsequently. Then, during the process of S51, S52, and S53, the engine speed is continuously regulated with the target speed as the target (see S59 in Figure 5 ). Until the engine speed regulation is completed (see S60 in Figure 5 ) and the gear engaging is completed (see S54 in Figure 5 ), the clutch is closed (see S61 in Figure 5 ), and the gearshift mode switching is completed (see S62 in Figure 5 ), and finally it ends. If there is no mode switching requirement, it directly ends and pure electric mode gearshift control is adopted.

[0051] Figure 6 is a schematic structural diagram of a vehicle mode switching device provided by an exemplary embodiment of the present application. As shown in Figure 4 , the vehicle mode switching device 6 includes: an acquisition module 601, configured to acquire vehicle load, vehicle gearshift information, vehicle current control mode, and vehicle target control mode when there is a vehicle mode switching requirement; a determination module 602, configured to determine a collaborative strategy for gearshift and vehicle control mode switching according to the vehicle load, vehicle current control mode, and vehicle target control mode; wherein, the collaborative strategy includes a neutral gear mode switching strategy and an in - gear mode switching strategy; a control module 603, configured to control gearshift and vehicle control mode switching according to the collaborative strategy and vehicle gearshift information.

[0052] As a possible implementation, the vehicle gear shifting information includes the current gear information and the target gear information, and the control module 603 can be configured to: shift gears according to the current gear information and the target gear information; wherein, the gear shifting process includes torque clearing, gear disengaging, motor speed regulation, and gear engaging; before torque clearing, the starter is controlled to start the engine; during torque clearing and gear disengaging, the engine speed and the motor speed are adjusted based on the target speed; wherein, the target speed is calculated based on the vehicle speed and the target gear information; when the engine speed and the motor speed meet the preset conditions, the clutch is controlled to close.

[0053] As a possible implementation, the control module 603 can be configured to: when the difference between the engine speed and the motor speed is less than or equal to the first preset difference, and the difference between the engine speed and the target speed is less than or equal to the second preset difference, and the difference between the motor speed and the target speed is less than or equal to the third preset difference, control the clutch to close.

[0054] As a possible implementation, the control module 603 can be configured to: when the actual gear of the transmission is in neutral, control the clutch to close; when the clutch is closed, control the motor to reverse-drag to start the engine; when the engine starts, control the motor to adjust the speed and engage the gear.

[0055] As a possible implementation, the determination module 602 can be configured to: when the vehicle load is less than the preset load, determine the collaborative strategy for gear shifting and vehicle control mode switching as the neutral gear mode switching strategy according to the current vehicle control mode and the target vehicle control mode.

[0056] As a possible implementation, the determination module 602 can be configured to: when the current vehicle control mode is the pure electric control mode, and the target vehicle control mode is the hybrid power control mode, and the vehicle load is less than the preset load, determine the collaborative strategy as the neutral gear mode switching strategy.

[0057] As a possible implementation, the determination module 602 can be configured to: when the vehicle load is greater than or equal to the preset load, determine the collaborative strategy for gear shifting and vehicle control mode switching as the in-gear mode switching strategy according to the current vehicle control mode and the target vehicle control mode.

[0058] As a possible implementation, the determination module 602 can be configured to: when the current vehicle control mode is the pure electric control mode, and the target vehicle control mode is the hybrid power control mode, and the vehicle load is greater than or equal to the preset load, determine the collaborative strategy as the in-gear mode switching strategy; or when the current vehicle control mode is the hybrid power control mode, and the target vehicle control mode is the hybrid power control mode, and the vehicle load is greater than or equal to the preset load, determine the collaborative strategy as the in-gear mode switching strategy.

[0059] The method in this application can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in this application are executed in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, a core network device, an OAM, or other programmable devices.

[0060] The computer program product can be written in any combination of one or more programming languages to write program code for performing the operations of the embodiments of this application. The programming languages include object-oriented programming languages such as Java, C++, etc., and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user computing device, partially on the user device, executed as an independent software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0061] The computer program or instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer program or instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center in a wired or wireless manner. The computer-readable storage medium can be any available medium that the computer can access, or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; it can also be an optical medium, such as a digital video disc; or it can be a semiconductor medium, such as a solid-state drive. The computer-readable storage medium can be a volatile or non-volatile storage medium, or can include both volatile and non-volatile types of storage media.

[0062] In addition, an embodiment of this application can also be a storage medium on which a computer program is stored, and the computer program is executed by a processor to perform the steps in the method for switching a vehicle mode described in any of the above embodiments of this specification: For the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should understand that this application is not limited by the described action sequence, because according to this application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0063] It should be noted that the embodiments in this specification are all described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other. For the device embodiments, since they are basically similar to the method embodiments, the description is relatively simple. For the relevant parts, reference can be made to the partial description of the method embodiments.

[0064] The steps in the method embodiments of this application can be adjusted, combined, and deleted according to actual needs. The technical features recorded in each embodiment can be replaced or combined. The devices in each embodiment of this application can be combined, divided, and deleted according to actual needs.

[0065] Those skilled in the art can further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed in this article can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the components and steps of each example have been generally described according to their functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this application.

[0066] The steps of the method or algorithm described in combination with the embodiments disclosed in this article can be directly implemented by hardware, a software unit executed by a processor, or a combination of the two. The software unit can be placed in a random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, register, hard disk, removable disk, CD-ROM, or any other form of storage medium well-known in the technical field.

[0067] Finally, it should also be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0068] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for switching a vehicle mode, characterized in that: include: When there is a need to switch the vehicle mode, obtain the vehicle load, vehicle shift information, vehicle current control mode and vehicle target control mode; Determine a coordinated strategy for shifting and switching the vehicle control mode according to the vehicle load, the current vehicle control mode, and the vehicle target control mode; wherein the coordinated strategy includes a neutral mode switching strategy and an in-gear mode switching strategy; According to the cooperative strategy and the vehicle gear shifting information, gear shifting and vehicle control mode switching are controlled.

2. The vehicle mode switching method according to claim 1, characterized in that: The vehicle shift information includes current gear information and target gear information. According to the in-gear mode switching strategy and the vehicle shift information, the shift and the vehicle control mode switching are controlled, including: Shifting gears according to the current gear information and the target gear information; wherein the gear shifting process includes clearing torque, shifting gears, motor speed regulation and shifting gears; Before clearing the torque, control the starter to start the engine; During the process of clearing torque and shifting gears, the engine speed and the motor speed are adjusted based on the target speed; wherein the target speed is calculated based on the vehicle speed and the target gear information; When the engine speed and the motor speed meet preset conditions, the clutch is controlled to close to complete the gear shift and vehicle control mode switching.

3. The vehicle mode switching method according to claim 2, characterized in that: When the engine speed and the motor speed meet a preset condition, controlling the clutch to close includes: When the difference between the engine speed and the motor speed is less than or equal to a first preset difference, and the difference between the engine speed and the target speed is less than or equal to a second preset difference, and the difference between the motor speed and the target speed is less than or equal to a third preset difference, the clutch is controlled to close.

4. The vehicle mode switching method according to claim 1, characterized in that: According to the neutral mode switching strategy and the vehicle shifting information, the gear shifting and the vehicle control mode switching are controlled, including When the actual gear position of the transmission is neutral, the clutch is controlled to close; When the clutch is closed, the motor is controlled to reverse and start the engine; When the engine is started, the motor is controlled to adjust the speed and shift into gear to complete the gear shift and vehicle control mode switching.

5. The vehicle mode switching method according to claim 1, characterized in that: Determining a coordinated strategy for shifting gears and switching vehicle control modes according to the vehicle load, the current vehicle control mode, and the vehicle target control mode includes: When the vehicle load is less than a preset load, the coordinated strategy of gear shifting and vehicle control mode switching is determined to be a neutral mode switching strategy according to the current vehicle control mode and the vehicle target control mode.

6. The method for switching vehicle modes according to claim 5, characterized in that: When the vehicle load is less than the preset load, the vehicle current control mode and the vehicle target control mode determine that the coordinated strategy of shifting and vehicle control mode switching is a neutral mode switching strategy, including: When the current control mode of the vehicle is a pure electric control mode, and the target control mode of the vehicle is a hybrid power control mode, and the vehicle load is less than a preset load, the coordination strategy is determined to be a neutral mode switching strategy.

7. The vehicle mode switching method according to claim 1, characterized in that: Determining a coordinated strategy for shifting gears and switching vehicle control modes according to the vehicle load, the current vehicle control mode, and the vehicle target control mode includes: When the vehicle load is greater than or equal to a preset load, the coordinated strategy of gear shifting and vehicle control mode switching is determined to be an in-gear mode switching strategy according to the current vehicle control mode and the vehicle target control mode.

8. The vehicle mode switching method according to claim 7, characterized in that: When the vehicle load is greater than or equal to a preset load, according to the current vehicle control mode and the vehicle target control mode, determining the coordinated strategy of shifting and vehicle control mode switching as an in-gear mode switching strategy includes: When the current control mode of the vehicle is the pure electric control mode, and the target control mode of the vehicle is the hybrid power control mode, and the vehicle load is greater than or equal to a preset load, determining that the coordination strategy is the in-gear mode switching strategy; or When the current control mode of the vehicle is a hybrid power control mode, and the target control mode of the vehicle is a hybrid power control mode, and the vehicle load is greater than or equal to a preset load, the coordination strategy is determined to be an in-gear mode switching strategy.

9. A vehicle mode switching device, characterized in that: include: An acquisition module, used to acquire vehicle load, vehicle shift information, vehicle current control mode and vehicle target control mode when there is a demand for vehicle mode switching; A determination module, configured to determine a coordinated strategy for shifting and switching the vehicle control mode according to the vehicle load, the current vehicle control mode, and the vehicle target control mode; wherein the coordinated strategy includes a neutral mode switching strategy and an in-gear mode switching strategy; A control module is used to control gear shifting and vehicle control mode switching according to the coordination strategy and the vehicle gear shifting information.

10. A vehicle, characterized in that: include: Transmissions, clutches, motors and engines; The vehicle mode switching device as claimed in claim 9 is communicatively connected to the gearbox, the clutch, the motor and the engine.

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