CN118004136A

CN118004136A - Vehicle mode switching control method and device, vehicle and medium

Info

Publication number: CN118004136A
Application number: CN202410108743.4A
Authority: CN
Inventors: 何子安
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2024-01-25
Filing date: 2024-01-25
Publication date: 2024-05-10

Abstract

The application provides a vehicle mode switching control method, a device, a vehicle and a medium, which are applied to a hybrid vehicle, wherein the vehicle comprises a hybrid transmission, and the hybrid transmission comprises: a first input shaft connected with a first clutch and a second input shaft connected with a second clutch, the method comprising: when the current operation mode of the vehicle is determined to be a series mode, judging whether the vehicle meets the preset condition of switching from the series mode to an idle hybrid four-wheel drive mode or not; when the vehicle is determined to meet the preset condition, the first clutch is controlled to be in a slipping state, and the second clutch is controlled to be in a closing state, so that the vehicle is switched from a series mode to an idle speed hybrid four-wheel drive mode. The method can ensure the stability and reliability of the vehicle in the running process, ensure the sufficient electric quantity of the battery pack and meet the driving requirement of a user.

Description

Vehicle mode switching control method and device, vehicle and medium

Technical Field

The present application relates to the field of vehicle technologies, and in particular, to a vehicle mode switching control method, device, vehicle, and medium in the field of vehicle technologies.

Background

With the advancement of modern automotive technology, four-wheel drive hybrid vehicles are often equipped with a variety of control modes in order to meet diverse driving requirements and to cope with various environmental conditions. In the series mode, the internal combustion engine is mainly responsible for driving the precursor motor to generate electric energy. This electrical energy is then transferred to the rear drive motor to propel the vehicle. However, when the vehicle passes over a complex road condition such as rough terrain or slippery road (e.g., mud or rain and snow), at a low speed in the series mode, the mere reliance on the rear-drive motor may result in insufficient traction and uneven power distribution. This may lead to reduced drivability and stability of the vehicle, thereby affecting the driving experience of the user.

Disclosure of Invention

The application provides a vehicle mode switching control method, a device, a vehicle and a medium, wherein the method can smoothly switch the control mode of the vehicle to an idle speed hybrid four-wheel drive mode so as to ensure the stability and reliability of the vehicle in the running process, and meanwhile, the method can also ensure sufficient electric quantity of a battery pack so as to meet the driving requirement of a user and improve the driving experience of the user.

In a first aspect, a vehicle mode switching control method is provided, which is applied to a hybrid vehicle including a hybrid transmission including: a first input shaft to which a first clutch is connected, and a second input shaft to which a second clutch is connected, the method comprising: when the current operation mode of the vehicle is determined to be a series mode, judging whether the vehicle meets the preset condition of switching from the series mode to an idle hybrid four-wheel drive mode or not; wherein in the series mode, the first clutch is in an open state, the second clutch is in a closed state, the engine of the vehicle is in a normal running state, the rear drive motor of the vehicle is in a driving state, and the engine drives the front drive motor of the vehicle to rotate so that the front drive motor charges a battery pack of the vehicle; when the vehicle is determined to meet the preset condition, controlling the first clutch to be in a slipping state, and controlling the second clutch to be in a closing state, so that the vehicle is switched from the series mode to the idle speed hybrid four-wheel drive mode; and in the idle speed mixed driving four-wheel driving mode, the first clutch is in a sliding grinding state, the second clutch is in a closing state, the engine is in an idle speed running state, the rear driving motor is in a driving state, the engine drives the front driving motor to rotate so that the front driving motor charges the battery pack, and the engine drives the front wheels to rotate.

In the technical scheme, the vehicle charges the battery pack by using the engine to drive the front motor in the series mode, and simultaneously drives the rear wheel to rotate by the rear motor, so that the driving force required by running of the vehicle is provided, and the sufficient electric quantity of the battery pack can be fully ensured. When the preset condition is met, the operation mode of the vehicle is stably switched to the idle speed hybrid four-wheel drive mode, the vehicle can be guaranteed to realize four-wheel drive running, the drivability of the vehicle is improved, the driving requirement of a user is met, the driving experience of the user is improved, and meanwhile, the vehicle has certain electricity-keeping capacity, so that the electric quantity of the battery pack is sufficient.

With reference to the first aspect, in some possible implementations, the determining whether the vehicle meets a preset condition for switching from the series mode to the idle hybrid four-wheel drive mode includes:

acquiring a target driving mode, a current vehicle speed and the residual electric quantity of a battery pack of the vehicle;

Judging whether the current vehicle speed is smaller than a vehicle speed threshold value and whether the residual electric quantity of the battery pack is in a preset electric quantity range or not under the condition that the target driving mode is a four-wheel drive mode;

and when the current vehicle speed is smaller than the vehicle speed threshold value and the residual electric quantity of the battery pack is in a preset electric quantity range, determining that the vehicle meets the preset condition.

With reference to the first aspect and the foregoing implementation manner, in some possible implementation manners, after controlling the first clutch to be in a slipping state and controlling the second clutch to be in a closed state, the switching the vehicle from the series mode to the idle hybrid four-wheel drive mode includes:

and sending a creep activation request to the automatic gearbox control unit so that the automatic gearbox control unit controls the vehicle to run according to the traditional creep strategy after detecting that the vehicle meets the traditional creep condition.

With reference to the first aspect and the foregoing implementation manner, in some possible implementation manners, after controlling the first clutch to be in a slipping state and controlling the second clutch to be in a closed state, the method further includes: and controlling the precursor motor to charge the battery pack with the idle charging torque, and transmitting an idle load torque to an engine controller so that the engine controller controls the engine to operate with the idle load torque.

With reference to the first aspect and the foregoing implementation manner, in some possible implementation manners, the controlling the first clutch to be in a slipping state and controlling the second clutch to be in a closed state, so that the vehicle is switched from the series mode to the idle hybrid four-wheel drive mode includes: the torque load of the precursor motor is controlled to control the engine to run at the target crankshaft speed, and a switching request for switching to the idle speed hybrid four-wheel drive mode is sent to an automatic gearbox control unit, so that the automatic gearbox control unit controls the first clutch to be in a slipping state, controls the second clutch to be in a closing state, and enables the vehicle to be switched from the series mode to the idle speed hybrid four-wheel drive mode.

With reference to the first aspect and the foregoing implementation manner, in some possible implementation manners, the controlling the engine to operate at the target crankshaft speed by controlling a torque of the precursor motor includes: determining a torque gradient of the precursor motor according to the target gear of the vehicle and the current vehicle speed; and controlling the torque load of the precursor motor according to the current crankshaft speed, the target crankshaft speed and the torque variation gradient of the engine so as to control the engine to operate at the target crankshaft speed.

With reference to the first aspect and the foregoing implementation manner, in some possible implementation manners, before the sending, to the automatic gearbox control unit, a switching request for switching to the idle hybrid four-wheel drive mode, so that the automatic gearbox control unit controls the first clutch to be in a slipping state, the method further includes: transmitting to an automatic transmission control unit that the odd-axis target gear of the vehicle is 1 and the even-axis target gear is neutral, so that the automatic transmission control unit controls the gear of the vehicle according to the odd-axis target gear and the even-axis target gear; wherein the odd axis is the first input axis and the even axis is the second input axis.

In a second aspect, there is provided a vehicle mode switching control device configured to a hybrid vehicle including a hybrid transmission including: a first input shaft to which a first clutch is connected, and a second input shaft to which a second clutch is connected, the apparatus comprising: the judging module is used for judging whether the vehicle meets the preset condition of switching from the series mode to the idle speed hybrid four-wheel drive mode or not when the current operation mode of the vehicle is determined to be the series mode; wherein in the series mode, the first clutch is in an open state, the second clutch is in a closed state, the engine of the vehicle is in a normal running state, the rear drive motor of the vehicle is in a driving state, and the engine drives the front drive motor of the vehicle to rotate so that the front drive motor charges a battery pack of the vehicle; the control module is used for controlling the first clutch to be in a slipping state and controlling the second clutch to be in a closing state when the vehicle is determined to meet the preset condition, so that the vehicle is switched from the series mode to the idle speed hybrid four-wheel drive mode; and in the idle speed mixed driving four-wheel driving mode, the first clutch is in a sliding grinding state, the second clutch is in a closing state, the engine is in an idle speed running state, the rear driving motor is in a driving state, the engine drives the front driving motor to rotate so that the front driving motor charges the battery pack, and the engine drives the front wheels to rotate.

With reference to the second aspect, in some possible implementations, the determining module is specifically configured to: acquiring a target driving mode, a current vehicle speed and the residual electric quantity of a battery pack of the vehicle; judging whether the current vehicle speed is smaller than a vehicle speed threshold value and whether the residual electric quantity of the battery pack is in a preset electric quantity range or not under the condition that the target driving mode is a four-wheel drive mode; and when the current vehicle speed is smaller than the vehicle speed threshold value and the residual electric quantity of the battery pack is in a preset electric quantity range, determining that the vehicle meets the preset condition.

With reference to the second aspect and the foregoing implementation manner, in some possible implementation manners, the foregoing determining module is further configured to: and sending a creep activation request to the automatic gearbox control unit so that the automatic gearbox control unit controls the vehicle to run according to the traditional creep strategy after detecting that the vehicle meets the traditional creep condition.

With reference to the second aspect and the foregoing implementation manner, in some possible implementation manners, the foregoing determining module is further configured to: and controlling the precursor motor to charge the battery pack with the idle charging torque, and transmitting an idle load torque to an engine controller so that the engine controller controls the engine to operate with the idle load torque.

With reference to the second aspect and the foregoing implementation manner, in some possible implementation manners, the foregoing control module is specifically configured to: the torque load of the precursor motor is controlled to control the engine to run at the target crankshaft speed, and a switching request for switching to the idle speed hybrid four-wheel drive mode is sent to an automatic gearbox control unit, so that the automatic gearbox control unit controls the first clutch to be in a slipping state, controls the second clutch to be in a closing state, and enables the vehicle to be switched from the series mode to the idle speed hybrid four-wheel drive mode.

With reference to the second aspect and the foregoing implementation manner, in some possible implementation manners, the foregoing control module is further specifically configured to: determining a torque gradient of the precursor motor according to the target gear of the vehicle and the current vehicle speed; and controlling the torque load of the precursor motor according to the current crankshaft speed, the target crankshaft speed and the torque variation gradient of the engine so as to control the engine to operate at the target crankshaft speed.

With reference to the second aspect and the foregoing implementation manner, in some possible implementation manners, the foregoing control module is further specifically configured to: transmitting to an automatic transmission control unit that the odd-axis target gear of the vehicle is 1 and the even-axis target gear is neutral, so that the automatic transmission control unit controls the gear of the vehicle according to the odd-axis target gear and the even-axis target gear; wherein the odd axis is the first input axis and the even axis is the second input axis.

In a third aspect, a vehicle is provided that includes a memory and a processor. The memory is for storing executable program code and the processor is for calling and running the executable program code from the memory such that the vehicle performs the method of the first aspect or any of the possible implementations of the first aspect.

In a fourth aspect, there is provided a computer program product comprising: computer program code which, when run on a computer, causes the computer to perform the method of the first aspect or any one of the possible implementations of the first aspect.

In a fifth aspect, a computer readable storage medium is provided, the computer readable storage medium storing computer program code which, when run on a computer, causes the computer to perform the method of the first aspect or any one of the possible implementations of the first aspect.

Drawings

FIG. 1 is a schematic plan view of a hybrid transmission provided in an embodiment of the present application;

FIG. 2 is a schematic diagram of a power route in a series mode provided by an embodiment of the present application;

FIG. 3 is a schematic diagram of a power line in an idle hybrid four-drive mode according to an embodiment of the present application;

FIG. 4 is a schematic flow chart of a vehicle mode switching control method provided by an embodiment of the present application;

Fig. 5 is a schematic structural diagram of a vehicle mode switching control device according to an embodiment of the present application;

Fig. 6 is a schematic structural diagram of a vehicle according to an embodiment of the present application.

Detailed Description

The technical scheme of the application will be clearly and thoroughly described below with reference to the accompanying drawings. Wherein, in the description of the embodiments of the present application, unless otherwise indicated, "/" means or, for example, a/B may represent a or B: the text "and/or" is merely an association relation describing the associated object, and indicates that three relations may exist, for example, a and/or B may indicate: the three cases where a exists alone, a and B exist together, and B exists alone, and furthermore, in the description of the embodiments of the present application, "plural" means two or more than two.

The terms "first," "second," and the like, are used below for descriptive purposes only and are not to be construed as implying or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.

The embodiment of the application provides a vehicle mode switching control method, which is applied to a hybrid vehicle, and the vehicle can be also called a hybrid vehicle. The control units in the hybrid vehicle may include HCU (hybrid control unit ), TCU (Transmission Control Unit, automatic transmission control unit), VCU (Vehicle Control Unit, whole vehicle control unit), PDCU (Power train Domain Control Unit, new energy power domain control unit), EMS (ENGINE MANAGEMENT SYSTEM, engine controller), TMCU (Drive Motor control Unit ). The hybrid vehicle further includes a hybrid transmission, and the hybrid transmission according to the present embodiment will be described with reference to fig. 1. FIG. 1 is a schematic plan view of a hybrid transmission.

Referring to fig. 1, the hybrid transmission includes a motor shaft 23, an engine output 24, a first input shaft 28, a second input shaft 25, a mechanical pump gear set, an output shaft 26, and a differential 27. Wherein the first input shaft may also be referred to as an external transmission input shaft and the second input shaft may also be referred to as an internal transmission input shaft. The transmission outer input shaft may be referred to as an odd shaft (also referred to as an odd shaft) and the transmission inner input shaft may be referred to as an even shaft (also referred to as an even shaft).

The first clutch 18 is connected to the first input shaft 28, and a plurality of first-gear drive gears are fixedly provided in order on the first input shaft 28. The second input shaft 25 is connected with a second clutch 19, a plurality of second gear driving gears are sequentially and fixedly arranged on the second input shaft 25, and the first gear driving gear or the second gear driving gear is in transmission connection with the motor shaft 23. The output shaft 26 is in transmission connection with the differential mechanism 27, and a plurality of gear driven gears are sleeved on the output shaft 26 in sequence in a hollow mode, and are respectively meshed with the first gear driving gears and the second gear driving gears in a one-to-one correspondence mode. The mechanical pump gear set is connected to the engine output 24 through the outer hub of the second clutch 19.

The first gear driving gears at least comprise a first gear 1 and a second gear 2, the second gear driving gears at least comprise a third gear 3 and a fourth gear 4, the plurality of gear driven gears at least comprise a fifth gear 5, a sixth gear 6, a seventh gear 7 and a eighth gear 8, the fifth gear 5, the sixth gear 6, the seventh gear 7 and the eighth gear 8 are meshed with the first gear 1, the second gear 2, the third gear 3 and the fourth gear 4 in one-to-one correspondence, a first gear shifter 20 is arranged between the seventh gear 7 and the eighth gear 8, and a second gear shifter 21 is arranged between the fifth gear 5 and the sixth gear 6.

The motor gear set at the end of the motor shaft 23 comprises a motor driving gear 14 and a motor driven gear 15, the motor driving gear 14 is fixedly connected to the end of the motor input end, the motor driven gear 15 is meshed with the motor driving gear 14 and meshed with the gear two 2 to realize pure electric 1-gear and 3-gear transmission or meshed with the gear four 4 to realize pure electric 2-gear and 4-gear transmission, so that the motor shaft 23 is in transmission connection with the second input shaft 25 or the first input shaft 28, and the motor can independently provide power or the motor is matched with an engine to provide hybrid power.

Wherein, one end of the output shaft 26 is fixedly provided with a parking gear 16, and the other end of the output shaft 26 is fixedly provided with a gear nine 9 for engaging a differential 27. The differential 27 is connected with a gear ten 10 meshed with the gear nine 9, so that the output shaft 26 is in transmission fit with the differential 27.

The mechanical pump gear set comprises a mechanical pump driving gear and a mechanical pump driven gear, wherein the mechanical pump driving gear is directly connected with an outer hub of the second clutch 19, the outer hub of the second clutch 19 is in transmission connection with the engine output end 24, the mechanical pump driving gear is meshed with the mechanical pump driven gear, and the mechanical pump driven gear is in transmission connection with the mechanical pump.

In fig. 1, the transmission outer input shaft is taken as an odd-numbered shaft, and the transmission inner input shaft is taken as an even-numbered shaft. In a specific implementation, the transmission outer input shaft may also be used as an even number shaft, and the transmission inner input shaft may also be used as an odd number shaft. That is, the first input shaft may also be used as an internal transmission input shaft and the second input shaft may also be used as an external transmission input shaft.

The series mode and the idle hybrid four-drive mode involved in the present embodiment are described below with reference to the hybrid transmission of fig. 1:

In the series mode, the engine drives the front drive motor to operate for generating electricity, and the rear drive motor drives the rear axle wheels. In the series mode, the engine is operated, the precursor motor is operated to generate electricity, and the electric energy generated by the precursor motor can charge the battery pack. The front axle wheels are driven, the rear drive motor operates to output power, and the rear axle wheels are driven to drive the vehicle to run. The front drive motor is disposed at a front axle position of the vehicle and thus may be referred to as a front axle motor, and the rear drive motor is disposed at a rear axle position of the vehicle and thus may be referred to as a rear axle motor.

To facilitate an understanding of the flow direction of power transfer in series mode, further description is provided below in connection with FIG. 2:

FIG. 2 is a schematic diagram of a power route in series mode. As can be seen in connection with fig. 2, the power route in series mode is: the engine output 24- & gtthe second clutch 19- & gtthe second input shaft 25- & gtthe fourth gear 4- & gtthe motor driven gear 15- & gtthe motor driving gear 14- & gtthe motor shaft 23 (motor power generation). The motor shaft 23 may be understood as the motor shaft of the precursor motor described above, and the motor power generation refers to the precursor motor power generation.

Under the idle speed mixed driving four-wheel drive mode, the first clutch is in a sliding grinding state, the second clutch is in a closing state, the 1 st gear is engaged, the 2 nd/4 nd gear is disconnected, the engine is in an idle speed state, the front driving motor and the rear driving motor are both in driving states, and the engine drives the front driving motor to rotate, so that the front driving motor charges a battery pack of the vehicle and the engine drives front wheels to rotate.

To facilitate an understanding of the flow direction of the power transfer in the idle hybrid four-wheel drive mode, further description is provided below in conjunction with fig. 3:

FIG. 3 is a schematic illustration of a power route in an idle hybrid four-drive mode. As can be seen in conjunction with fig. 1 and 3, the power route in the idle hybrid four-wheel drive mode is:

The engine output 24- > the first clutch 18- > the first input shaft 28- > gear one 1- > gear five 5- > the second shifter 21- > gear nine 9- > gear ten 10- > the differential 27- > the front wheels.

The engine output 24- & gtthe second clutch 19- & gtthe second input shaft 25- & gtthe fourth gear 4- & gtthe motor driven gear 15- & gtthe motor drive gear 14- & gtthe motor shaft 23 (precursor motor generation).

Under the idle speed mixed driving four-wheel drive mode, electric quantity can be kept for the battery pack, a 2-gear/4-gear neutral gear (not in gear) is achieved, a second clutch is closed, an engine drives a precursor motor to rotate, and the precursor motor generates electricity to charge the battery pack.

The following describes the implementation flow of the vehicle mode switching control method in the present embodiment in detail with reference to fig. 1 to 3.

Fig. 4 is a schematic flowchart of a method for vehicle mode switching control according to an embodiment of the present application. The execution subject of the control method may be a control unit in the vehicle, such as the HCU or VCU or PDCU described above.

Illustratively, as shown in FIG. 4, the method includes:

s401, when the current operation mode of the vehicle is determined to be the series mode, judging whether the vehicle meets the preset condition of switching from the series mode to the idle hybrid four-wheel drive mode.

In the series mode, the first clutch is in an open state, the second clutch is in a closed state, the engine of the vehicle is in a normal running state, the rear drive motor of the vehicle is in a driving state, the rear drive motor drives the rear wheels to rotate, and the engine drives the front drive motor of the vehicle to rotate, so that the front drive motor charges a battery pack of the vehicle.

Under different weather conditions (such as rainy days, snowy days, sunny days and the like), road conditions (such as urban roads, highways, mountain roads and the like) or vehicle driving states (such as low-speed states and low-power states), the vehicle can adopt different operation modes so as to ensure the optimal driving performance, and simultaneously, good driving experience is brought to a driver. The vehicle operation mode may specifically refer to a control mode of a vehicle powertrain, including, but not limited to, a four-drive-only mode, a rear-drive-only mode, a series mode, a direct-drive-four-drive mode, an idle hybrid-drive-four-drive mode, and the like. They have different driving characteristics, respectively, and may provide different driving experiences.

For example, when the urban road is running, the vehicle does not need strong power performance, and under the condition of insufficient electric quantity of the vehicle, the vehicle can adopt a series mode, and the vehicle can better ensure sufficient electric quantity of the battery pack in the series mode, so that the vehicle can not normally run due to insufficient electric quantity of the battery pack.

The vehicle stores preset conditions for switching from the series mode to the idle hybrid four-wheel drive mode, wherein the preset conditions can be conditions related to running state information of the vehicle, and the running state information of the vehicle can be acquired when the current operation mode of the vehicle is determined to be the series mode, so that whether the vehicle currently meets the preset conditions for switching from the series mode to the idle hybrid four-wheel drive is judged.

The running state information of the vehicle may include state information of the vehicle and operation information of the vehicle by the driver. Specifically, the state information of the vehicle may include a remaining capacity of a battery pack of the vehicle, a current vehicle speed of the vehicle, and the like. The driver's operation information on the vehicle may include operation data on the driver's brake, throttle, clutch, steering wheel, and gear, etc.

It should be appreciated that the preset conditions may be set prior to shipment of the vehicle or may be updated later by Over-the-Air Technology (OTA). When the preset condition is met, the vehicle can be automatically switched from the series mode to the idle speed hybrid four-wheel drive mode.

And S402, when the vehicle is determined to meet the preset condition, controlling the first clutch to be in a slipping state and controlling the second clutch to be in a closing state, so that the vehicle is switched from a series mode to an idle speed hybrid four-wheel drive mode.

Under the idle speed mixed driving four-wheel driving mode, the first clutch is in a sliding grinding state, the second clutch is in a closing state, the vehicle engine is in an idle speed running state, the rear driving motor is in a driving state and drives the rear wheels to rotate, and the engine drives the front driving motor to rotate, so that the front driving motor charges a battery pack and the engine drives the front wheels to rotate.

In the series mode, the vehicle engine drives the front drive motor of the vehicle to rotate so as to charge the battery pack of the vehicle, and the electric quantity of the battery pack can be maintained, but in the aspect of vehicle power output, the traction force and the maneuverability are slightly insufficient because only the rear drive motor outputs power. When the vehicle meets the preset condition, the vehicle is required to run in the idle speed mixed driving four-wheel driving mode, and the vehicle can acquire stronger driving performance and more comfortable driving experience in the idle speed mixed driving four-wheel driving mode.

For example, when a vehicle is traveling on a low ground surface (such as a mud ground), it is generally necessary to maintain a low traveling speed and a strong power output in order to secure safety of the vehicle. In the series mode, the vehicle has weaker power output and cannot provide enough traction force, so that the vehicle is difficult to control and has poor driving experience. At this time, if the running state information of the vehicle meets the preset condition, the vehicle operation mode can be stably switched to the idle speed hybrid four-wheel drive mode, the four-wheel drive running can be realized through the idle speed intervention front axle drive of the engine, enough power output is provided, and the vehicle can safely creep through the low-speed road surface without losing control.

In the method, under the idle speed hybrid four-wheel drive mode, the engine can output power to the front wheels of the vehicle through the first clutch in a skid-ground state, so that sufficient power output is provided for the vehicle, and the drivability of the vehicle is improved; the engine can also drive the precursor motor to charge the battery pack through the second clutch in the closed state, so that the excessive consumption of the electric quantity of the battery is avoided, and the battery pack has certain electricity-keeping performance.

In some embodiments, determining whether the vehicle satisfies a preset condition for switching from the series mode to the idle hybrid four-wheel drive mode includes: acquiring a target driving mode, a current speed and the residual capacity of a battery pack of a vehicle; under the condition that the target driving mode is a four-wheel drive mode, judging whether the current vehicle speed is smaller than a vehicle speed threshold value and whether the residual electric quantity of the battery pack is in a preset electric quantity range; and when the current vehicle speed is smaller than the vehicle speed threshold value and the residual electric quantity of the battery pack is in a preset electric quantity range, determining that the vehicle meets a preset condition.

As in the above embodiment, whether the vehicle satisfies the preset condition for switching to the idle hybrid four-wheel drive mode is determined according to the driving state information of the vehicle. The running state information may specifically be: the target driving mode of the vehicle, the current vehicle speed, and the remaining power of the battery pack. The preset conditions may specifically be: the current driving mode is a four-wheel driving mode, the current speed of the vehicle is smaller than the speed threshold value, and the residual electric quantity of the battery pack is in a preset electric quantity range.

Specifically, in the series mode, the vehicle has better power conservation capacity because the engine drives the front drive motor to charge, but in the aspect of driving performance, the vehicle is poorer than the direct-drive four-drive mode or the pure four-drive mode because only the rear drive motor drives. When the vehicle runs to a complex road condition, the vehicle needs to creep at a low speed to ensure running safety, the target driving mode can be set to be a four-wheel drive mode, and after the creep speed is met (if the speed is reduced through braking or the road resistance causes the speed to be smaller than a speed threshold value), the vehicle is switched to an idle speed hybrid four-wheel drive mode to control the creep of the vehicle.

The driving modes of the vehicle may include a two-drive mode and a four-drive mode. In the two-drive mode, the vehicle is mainly powered by front axle wheels or rear axle wheels, and the two-drive mode can specifically comprise a standard mode, an economic mode, a sport mode and the like. Exemplary: in the standard mode, the vehicle can provide balanced power output and fuel efficiency, and is suitable for most normal road conditions; in the economy mode, the vehicle adjusts the power system to reduce fuel consumption and emissions; in the sport mode, the vehicle provides more aggressive acceleration and more agile handling capabilities, such as increasing throttle response, increasing gearbox shift points, etc.

In the four-wheel drive mode, the front axle wheels and the rear axle wheels of the vehicle can participate in power output at the same time, and the four-wheel drive mode can specifically comprise four-wheel drive mode (All-WHEEL DRIVE, AWD), snowfield mode, mud mode, sand mode and the like. Exemplary: in the AWD mode, the vehicle can provide good traction and stability under any road condition, and the power distribution of front and rear wheels is automatically adjusted; in a snow mode, the vehicle is specially adapted to a snow or low-friction road surface, so that the stability and traction of the vehicle on a smooth road surface are improved; in the mud mode, the vehicle is specially adapted to the muddy road, and the trafficability of the vehicle is enhanced by adjusting the power distribution and traction control system; in the sand mode, the vehicle is specially adapted to the sandy ground, so that the vehicle is ensured to have better drivability on the soft or slipping sand.

Each driving mode is optimized for a particular driving environment and driver demand. The proper driving mode is selected, so that the performance, safety and comfort of the vehicle can be improved, and the vehicle is suitable for different road conditions and driving styles.

In some embodiments, the four-wheel drive mode in the preset condition of the present application is any one of the AWD mode, the snowfield mode, the mud mode, or the sand mode. The target driving mode may be controlled by a driving mode adjusting button or a bar, and when the target driving mode is a four-wheel drive mode, the current driving mode adjusting button or the bar of the vehicle is in any one of an AWD mode, a snowfield mode, a mud mode or a sand mode.

The residual electric quantity of the vehicle battery pack generally needs to maintain a certain electric quantity, so that the battery can be protected, and the damage caused by overdischarge of the battery is avoided, and the service life of the battery is influenced; meanwhile, the safety of the vehicle is guaranteed, the situation that the vehicle encounters an emergency is avoided, and enough electric power cannot be provided. And therefore, when the remaining capacity of the battery pack is smaller than the first capacity threshold value, the vehicle is required to adopt an operation mode with electricity-retaining capacity; when the residual electric quantity of the battery pack is smaller than a second electric quantity threshold value, the battery pack cannot continue to supply power; the second electric quantity threshold value is smaller than the first electric quantity threshold value, and the preset electric quantity range is the electric quantity range between the first electric quantity threshold value and the second electric quantity threshold value.

By way of example, assume that the vehicle speed threshold is the maximum vehicle speed at which the vehicle is creeping, for example 10km/h; the first power threshold is 20% and the second power threshold is 10%. If the vehicle is in the series mode currently, the current driving mode of the vehicle is an AWD mode, and a user encounters a complex road condition in the driving process, so that the speed of the vehicle is lower than a speed threshold, for example, the speed is reduced from 30km/h to 9km/h through braking, and the speed of the vehicle is lower than the speed threshold by 10km/h; the remaining battery power is 15%, is smaller than the first power threshold value by 20% and is larger than the second power threshold value by 10%, and at the moment, the running state information of the vehicle is determined to meet the preset condition of switching to the idle speed hybrid four-wheel drive mode.

In some embodiments, the preset conditions may further include, but are not limited to, a shift lever of the vehicle being in a forward gear (D-gear) or a neutral gear (N-gear) and an accelerator pedal opening of the vehicle being less than an opening threshold.

Specifically, the preset conditions are set according to the gear position of the gear lever and the opening degree of the accelerator pedal of the vehicle, so that the time when the vehicle needs to be switched from the series mode to the idle speed hybrid four-wheel drive mode can be accurately determined, and the driving experience of a user can be improved. The smaller the accelerator pedal opening of the vehicle, the smaller the accelerator pedal stroke, i.e., the accelerator pedal opening is 0%, i.e., the accelerator pedal is in a natural state (not depressed), and the accelerator pedal opening is 100%, i.e., the accelerator pedal is fully depressed.

In some embodiments, after the controlling the first clutch to be in the slip state and the controlling the second clutch to be in the closed state to switch the vehicle from the series mode to the idle hybrid four-wheel drive mode, the method includes: and sending a creep activation request to the TCU, so that the TCU controls the vehicle to run according to the traditional creep strategy after detecting that the vehicle meets the traditional creep condition.

The traditional creeping conditions are preset in the vehicle, and can include, but are not limited to, that the current gear shift lever of the vehicle is in D gear, that the intelligent driving function is not interfered, that the accelerator is not stepped on, that the transmission is not faulty, and the like. When the fact that the vehicle meets the traditional creeping condition is detected, the fact that the vehicle can perform traditional creeping is determined, and the vehicle activates a traditional creeping strategy to control the creeping of the vehicle.

Creep activation can be understood as: vehicles are currently permitted to creep, i.e., the vehicle is not currently prohibited from creeping.

The traditional creep strategy may be: the engine is maintained at idle speed, the TCU controls the clutch to be in a slip state, and the creep speed is controlled through the slip of the clutch in the slip state.

The clutch in the slipping state can be understood as: the clutch is not fully engaged, and gears on two sides of the clutch have a certain speed difference. When the first clutch is in a sliding state, gears on two sides of the first clutch have certain speed difference, and the engine transmits power to the front wheels of the vehicle at idle speed.

In the method, after the vehicle is switched from the series mode to the idle speed hybrid four-wheel drive mode, if the vehicle does not prohibit creep at present and the vehicle meets the traditional creep condition, the vehicle activates the traditional creep strategy, and the creep speed is controlled by controlling the slip of the clutch in the slip state, so that the creep control strategy of the vehicle can be simplified, and the stability and reliability of the vehicle control are ensured.

In some embodiments, after the controlling the first clutch to be in the slip state and the controlling the second clutch to be in the closed state to switch the vehicle from the series mode to the idle hybrid four-wheel drive mode, the method further includes: and controlling the precursor motor to charge the battery pack with the idle charging torque, and sending the idle load torque to the EMS so that the EMS controls the engine to operate with the idle load torque.

Specifically, after the vehicle is switched from the series mode to the idle hybrid four-wheel drive mode, the TCU activates a corresponding creep strategy, such as the conventional creep strategy described above; the TCU can send an idle speed request to a control unit in the vehicle according to the currently activated creeping strategy, and the vehicle control unit distributes idle load torque of the engine and idle charging torque of the precursor motor based on the idle speed request, so that the engine can meet driving torque required by creeping of the vehicle and idle charging torque of the precursor motor in an idle state, and the electric quantity of the battery pack is ensured.

Among them, the idle charging torque can be understood as: when the engine runs at idle speed, the precursor motor charges the battery pack with the required torque. Idle load torque can be understood as: the engine needs to generate total torque during idle running to adapt to the running load of the vehicle, such as idle charging torque of an air conditioner and a precursor motor.

The idle speed of the engine may be controlled by an engine control module (Engine Control Module, ECM) in the EMS to set and maintain a predetermined steady level. The ECM is responsible for receiving and processing input information from various components (sensors) and controlling key operations of the engine such as injection, ignition, idle, and emissions based on such information. By control of the ECM, smooth operation of the engine at idle can be maintained.

In some embodiments, the controlling the first clutch to be in a slip state and controlling the second clutch to be in a closed state to switch the vehicle from the series mode to the idle hybrid four-wheel drive mode includes: the torque load of the precursor motor is controlled to control the engine to run at the target crankshaft rotating speed, and a switching request for switching to the idle speed mixed four-drive mode is sent to the TCU, so that the TCU controls the first clutch to be in a slipping state, controls the second clutch to be in a closing state, and enables the vehicle to be switched from the series mode to the idle speed mixed four-drive mode.

Specifically, when the vehicle is traveling in the series mode, the engine of the vehicle is required to drive the front motor to generate power to charge the battery pack, and the rotational speed of the engine is typically set to be maintained in a rotational speed range of maximum thermal efficiency, such as between 2000 and 3000 revolutions, so as to be able to generate sufficient power to supply the rear drive motor. In contrast, when the vehicle runs at idle speed, the idle speed output of the engine is relied on, the vehicle runs slowly in the idle speed state of the engine, the power of the idle speed output of the engine is relatively low, and the requirement of running of the vehicle can be met only by low rotating speed. Therefore, when the vehicle is switched from the series mode to the idle speed hybrid four-wheel drive mode, the rotating speed of the engine is required to be reduced, the mode switching process is more stable, the problems of vehicle jerk, shake and the like caused by sudden load after the engine running at high speed is driven by wheels before intervention are avoided, the burden on the engine and the clutch is reduced, and the service life of the vehicle is prolonged.

The rotational speed of the engine is directly affected by its load. When the load increases, if the power output is not increased, the rotation speed of the engine decreases; conversely, decreasing the load may increase the rotational speed. The rotational speed of the engine can be effectively controlled by adjusting the load within a certain range. In series mode, the precursor motor is used to generate electricity, which corresponds to a load on the engine. By increasing the torque load of the precursor motor (i.e., increasing the force of the motor against rotation), more power from the engine can be absorbed, thereby reducing the rotational speed of the engine. Conversely, reducing the torque load may reduce the engine load, causing the engine speed to rise. Through the torque load of accurate control precursor motor, can realize the careful regulation to engine crankshaft rotational speed, through adjusting engine rotational speed smoothly, can show noise reduction and vibration to provide more comfortable and pleasant driving experience.

In some embodiments, controlling the torque load of the precursor motor to control the engine to operate at the target crankshaft speed comprises: determining a torque variation gradient of a precursor motor according to a target gear and a current speed of the vehicle; and controlling the torque load of the precursor motor according to the current crankshaft speed, the target crankshaft speed and the torque change gradient of the engine so as to control the engine to run at the target crankshaft speed.

Specifically, the torque change gradient refers to the change rate of the torque load of the precursor motor, which indicates that the torque load of the precursor motor is adjusted along with the change of time or other variables (such as the vehicle speed or the engine speed), and determines the adjustment speed and the smoothness of the torque load of the precursor motor, so that the adjustment smoothness of the engine speed is directly affected. The gradient of torque variation of the precursor motor may be determined or defined based on a target gear of the vehicle and a current vehicle speed.

The current crankshaft speed of the engine and the target crankshaft speed (i.e. the preset idle crankshaft speed) which is expected to be achieved are monitored by a PI (proportional-integral) speed controller, and the torque of the precursor motor is adjusted step by step based on the torque change gradient of the precursor motor, so that the rotating speed of the engine can be controlled more smoothly and accurately, and the engine can be operated according to the preset target crankshaft speed.

For example, the vehicle control unit HCU may define a target rotational speed curve (torque variation gradient) of the precursor motor according to the target gear and the current vehicle speed. Then, the HCU may turn on the PI speed controller to monitor the rotational speed of the engine and output the torque load of the precursor motor according to the target rotational speed profile of the precursor motor, creating a torque command. The PI speed controller is used for gradually controlling the torque load of the precursor motor, energy is absorbed from the engine and is converted into electric energy, so that the rotating speed of the engine is reduced, the rotating speed of the engine is smoothly and stably controlled to be regulated to the target crankshaft rotating speed, the energy utilization of the vehicle is optimized, and the rotating speed regulation of the engine is smoother and more stable.

After the speed of the engine is regulated, the TCU can control the first clutch to be pre-filled with oil within a set time after receiving a switching request for switching to an idle speed hybrid four-wheel drive mode, and after the pre-filling is completed, the speed difference at two sides of the first clutch is lower than a preset speed difference threshold value, so that two clutch plates of the first clutch can be pushed to a position capable of transmitting torque in advance (in a slipping state), and smooth torque transmission can be realized when the state of the clutch needs to be controlled later. Since the second clutch is in a closed state for transmitting torque to the front drive motor for the front drive motor to generate power, whether in the series mode or the idle hybrid four-wheel drive mode, the TCU of the vehicle can control the second clutch to remain in the closed state.

According to the method, after the adjustment states of the first clutch and the second clutch are controlled by the TCU, the actual operation mode of the vehicle can be switched from the series mode to the idle speed hybrid four-wheel drive mode, the clutch control and the operation mode switching of the vehicle are smooth and stable, noise and vibration in the switching process are reduced, and better driving experience is provided.

In some embodiments, sending a switch request to the TCU to switch to the idle hybrid four-drive mode includes: and sending a target operation mode of the vehicle to the TCU to be a direct-drive four-drive mode, and an idle pure four-drive mode non-activation request and/or an idle hybrid four-drive mode activation request, so that the TCU determines a switching request for switching to the idle hybrid four-drive mode.

Specifically, after the vehicle activates a switching request for switching to the idle hybrid four-wheel drive mode, the state of the idle hybrid four-wheel drive mode of the vehicle is an activated state, and correspondingly, the state of the idle pure electric four-wheel drive mode of the vehicle is an inactivated state, at this time, the HCU sends a request for activating the idle hybrid four-wheel drive mode and/or a request for deactivating the idle pure electric four-wheel drive mode to the TCU, and the target operation mode of the vehicle is a direct-drive four-wheel drive mode, so that the TCU determines that the vehicle requests to switch to the idle hybrid four-wheel drive mode.

In the vehicle operation mode, the signal calibration of the direct-drive four-drive mode, the series mode and the parallel mode is usually fixed, and in order not to change the original calibration, the signal calibration of the original direct-drive four-drive mode, the idle speed pure electric four-drive mode non-activation request and/or the idle speed hybrid four-drive mode activation request signal calibration representation can be specified in advance to be switched to the idle speed hybrid four-drive mode. That is, the TCU may determine a switching request for the vehicle to switch to the idle hybrid four-drive mode according to the current target operating mode of the vehicle being a direct-drive four-drive mode, an idle pure-electric mode deactivation request, and/or an idle hybrid four-drive mode activation request.

According to the method, the signal calibration of the original operation mode is designated, and the signal calibration of the idle speed mixed driving four-wheel drive mode non-activation request and/or the idle speed mixed driving four-wheel drive mode activation request is/are switched to the idle speed mixed driving four-wheel drive mode, so that the signal calibration of the new operation mode can be obtained on the basis of not changing the original signal calibration, the method is more convenient and practical, and the method is well applicable to the existing signal calibration system.

In some embodiments, before the sending the switching request to the TCU to switch to the idle hybrid four-wheel drive mode to enable the TCU to control the first clutch to be in the slip state, the method further includes: transmitting to the TCU that the odd-axis target gear of the vehicle is 1 gear and the even-axis target gear is neutral, so that the TCU controls the gear of the vehicle according to the odd-axis target gear and the even-axis target gear; wherein the odd axis is the first input axis and the even axis is the second input axis.

Specifically, the odd-axis target gear is set to be 1 gear, the front wheels of the vehicle can be driven by the engine to creep after the first clutch is in a sliding state, the 1 gear accords with idle creep driving conditions, and the gear is pre-engaged in advance, so that the switching process of the vehicle operation mode can be more stable. The engine is charged by the second clutch which is in a closed state and needs to pass through in the series mode or the idle speed hybrid four-wheel drive mode, so that the target gear of the even shaft is set to be a neutral gear, and the situation that the torque input to the precursor motor by the engine is abnormally distributed to front axle wheels to cause damage to the gearbox and the engine of the vehicle can be avoided.

The vehicle mode switching control method in the embodiment of the application is explained below with reference to specific examples.

When the vehicle simultaneously meets the following preset conditions:

1. The current mode of operation is a series mode;

2. the current vehicle speed is below a vehicle speed threshold (e.g., 10 km/h);

3. the gear of the gear shifting lever is D gear or N gear;

4. The target driving mode is an AWD mode, a snow mode, a mud mode, or a sand mode;

5. The remaining capacity of the battery pack is within a preset capacity range (e.g., 10% -20%).

Then activating a request from series mode to idle hybrid four-drive mode, the HCU may perform the following operations:

S101, sending an odd-axis target gear request to a TCU; the odd-axis target gear request carries an odd-axis target gear that is 1.

S102, sending an even-axis target gear request to the TCU; the even-axis target gear request carries an even-axis target gear, which is a neutral gear.

S103, sending a target gear request to the TCU; the target gear request carries a target gear, which is 1 st gear.

S104, sending the current operation mode to the TCU to be a serial mode.

S105, sending a target operation mode request to the TCU; the target operation mode request carries a target operation mode, and the target operation mode is a direct-drive four-drive mode.

S106, sending an idle speed pure electric four-wheel drive mode non-activation request to the TCU.

S107, sending an idle speed hybrid four-wheel drive mode activation request to the TCU.

S108, sending a first clutch no-request to the TCU.

S109, sending a second clutch closing request to the TCU.

S110, sending a torque request to the TMCU, wherein the torque request carries a target torque.

In this embodiment, the order of sending the requests in S101 to S110 is not specifically limited, and may be sequentially sent, or may be simultaneously sent. The following describes the response of each request after the TCU/TMCU receives each request:

After the TMCU receives the torque request, the TMCU will control the torque of the precursor motor to follow the torque set point in the torque command. Specifically, the HCU may define a target speed curve according to the target gear and the current vehicle speed, start the PI speed controller, add the target torque calculated by the PI speed controller to the torque request of the precursor motor through torque distribution, so as to enable the precursor motor to generate a torque load, reduce the speed of the engine, gradually adjust a specific value of the target torque through the PI speed controller, and finally control the engine speed to the target crankshaft speed.

After the TCU receives the current operation mode in S104 and the target operation mode request in S105, the TCU may know the current operation mode and the operation mode requested to be switched to apply the corresponding control policy.

After the TCU receives the odd-axis target gear request in S101, the even-axis target gear request in S102, the target gear request in S103, and the target operation mode request in S105, the TCU may know the requested operation mode and the required gear, and control the first shifter of the transmission to engage 1 gear on the odd-axis in response to the request. Wherein, since the even shaft is always in neutral from the series mode to the idle hybrid four-drive mode, the TCU will not need to perform a shift action on the even shaft.

After the TCU receives the target operation mode request in S105, the idle pure electric four-drive mode non-activation request in S106, the idle hybrid four-drive mode activation request in S107, the first clutch no request in S108, and the second clutch closing request in S109, the TCU should control the first clutch to complete the oil filling within the filling time (150 ms) so that the speed difference on both sides of the first clutch is lower than the preset speed difference threshold (e.g. 200 rpm). And transmits the state of the first clutch (slip state) to the HCU. Wherein, since the second clutch is always in a closed state from the series mode to the idle hybrid four-drive mode, the TCU will not need to perform an action on the second clutch. The first clutch has no request, which means that the HCU gives the control right of the first clutch to the TCU, and the TCU controls the control right according to a preset strategy.

And after the HCU receives the first clutch state sent by the TCU and knows that the first clutch is in a slipping state, the PI speed controller is deactivated, and the current operation mode is set to be a direct-drive four-drive mode, namely the switching from the series mode to the idle speed mixed-drive four-drive mode is realized.

After the current operation mode is set to be the direct-drive four-drive mode (actually, the idle hybrid four-drive mode), the HCU will send a creep activation request to the TCU and the current operation mode is the direct-drive four-drive mode.

After the TCU receives the creep activation request and the current operation mode is the direct-drive four-drive mode, the TCU detects whether the vehicle currently meets the traditional creep condition, and activates the traditional creep strategy after determining that the vehicle meets the traditional creep condition. An idle speed request is sent to the HCU based on a traditional creep strategy.

After receiving an idle speed request from the TCU, the HCU performs torque distribution and sends an idle speed charging torque to the TMCU so that the TMCU controls the precursor motor to operate according to the idle speed charging torque; an idle load torque is sent to the ECM to cause the ECM to control the engine in accordance with the idle load torque to meet the torque required for the precursor charge and the creep drive of the vehicle.

In the embodiment of the application, the vehicle charges the battery pack by using the engine to drive the front motor and simultaneously drives the rear wheels to rotate under the serial mode, so that the driving force required by the running of the vehicle is provided, the sufficient electric quantity of the battery pack can be fully ensured, but the driving performance of the serial mode is poor, and the driving requirement of complex road conditions can not be met. When the preset condition is met, the operation mode of the vehicle is stably switched to the idle speed hybrid four-wheel drive mode, the vehicle can be guaranteed to realize four-wheel drive running, the drivability of the vehicle is improved, the driving requirement of a user is met, the driving experience of the user is improved, and meanwhile, the vehicle has certain electricity-keeping capacity, so that the electric quantity of the battery pack is sufficient.

Fig. 5 is a schematic structural diagram of a vehicle mode switching control device according to an embodiment of the present application.

For example, as shown in fig. 5, the apparatus 500 is configured in a hybrid vehicle including a hybrid transmission including: a first input shaft to which a first clutch is connected and a second input shaft to which a second clutch is connected, the apparatus 500 includes:

A judging module 501, configured to judge whether the vehicle satisfies a preset condition for switching from the series mode to an idle hybrid four-wheel drive mode when determining that a current operation mode of the vehicle is a series mode; wherein in the series mode, the first clutch is in an open state, the second clutch is in a closed state, the engine of the vehicle is in a normal running state, the rear drive motor of the vehicle is in a driving state, and the engine drives the front drive motor of the vehicle to rotate so that the front drive motor charges a battery pack of the vehicle;

The control module 502 is configured to control the first clutch to be in a slip state and control the second clutch to be in a closed state when it is determined that the vehicle meets the preset condition, so that the vehicle is switched from the series mode to the idle hybrid four-wheel drive mode; and in the idle speed mixed driving four-wheel driving mode, the first clutch is in a sliding grinding state, the second clutch is in a closing state, the engine is in an idle speed running state, the rear driving motor is in a driving state, the engine drives the front driving motor to rotate so that the front driving motor charges the battery pack, and the engine drives the front wheels to rotate.

In one possible implementation, the determining module 501 is specifically configured to: acquiring a target driving mode, a current vehicle speed and the residual electric quantity of a battery pack of the vehicle; judging whether the current vehicle speed is smaller than a vehicle speed threshold value and whether the residual electric quantity of the battery pack is in a preset electric quantity range or not under the condition that the target driving mode is a four-wheel drive mode; and when the current vehicle speed is smaller than the vehicle speed threshold value and the residual electric quantity of the battery pack is in a preset electric quantity range, determining that the vehicle meets the preset condition.

In a possible implementation, the control module 502 is further configured to: and sending a creep activation request to the TCU, so that the TCU controls the vehicle to run according to the traditional creep strategy after detecting that the vehicle meets the traditional creep condition.

In a possible implementation, the control module 502 is further configured to: the precursor motor is controlled to charge the battery pack with an idle charge torque, and an idle load torque is transmitted to an EMS so that the EMS controls the engine to operate with the idle load torque.

In one possible implementation, the control module 502 is specifically configured to: the torque load of the precursor motor is controlled to control the engine to run at the target crankshaft speed, and a switching request for switching to the idle speed hybrid four-drive mode is sent to the TCU, so that the TCU controls the first clutch to be in a slipping state, controls the second clutch to be in a closing state, and enables the vehicle to be switched from the series mode to the idle speed hybrid four-drive mode.

In a possible implementation manner, the control module 502 is further specifically configured to: determining a torque gradient of the precursor motor according to the target gear of the vehicle and the current vehicle speed; and controlling the torque load of the precursor motor according to the current crankshaft speed, the target crankshaft speed and the torque variation gradient of the engine so as to control the engine to operate at the target crankshaft speed.

In a possible implementation manner, the control module 502 is further specifically configured to: transmitting to a TCU that an odd-axis target gear of the vehicle is 1 and an even-axis target gear is neutral, so that the TCU controls the gear of the vehicle according to the odd-axis target gear and the even-axis target gear; wherein the odd axis is the first input axis and the even axis is the second input axis.

Illustratively, as shown in FIG. 6, the vehicle 600 includes: a memory 601 and a processor 602, wherein the memory 601 stores therein an executable program code 6011, and the processor 602 is configured to call and execute the executable program code 6011 to execute a vehicle mode switching control method.

In addition, the embodiment of the application also protects a device, which can comprise a memory and a processor, wherein executable program codes are stored in the memory, and the processor is used for calling and executing the executable program codes to execute the vehicle mode switching control method provided by the embodiment of the application.

In this embodiment, the functional modules of the apparatus may be divided according to the above method example, for example, each functional module may be corresponding to one processing module, or two or more functions may be integrated into one processing module, where the integrated modules may be implemented in a hardware form. It should be noted that, in this embodiment, the division of the modules is schematic, only one logic function is divided, and another division manner may be implemented in actual implementation.

In the case of dividing each function module by corresponding each function, the apparatus may further include a judgment module, a control module, and the like. It should be noted that, all relevant contents of each step related to the above method embodiment may be cited to the functional description of the corresponding functional module, which is not described herein.

It should be understood that the apparatus provided in this embodiment is used to perform the above-described one of the vehicle mode switching control methods, and therefore the same effects as those of the above-described implementation methods can be achieved.

In case of an integrated unit, the apparatus may comprise a processing module, a memory module. Wherein, when the device is applied to a vehicle, the processing module can be used for controlling and managing the action of the vehicle. The memory module may be used to support the vehicle in executing associated program code, etc.

Wherein the processing module may be a processor or controller that may implement or perform the various exemplary logic blocks, modules and circuits described in connection with this disclosure. A processor may also be a combination of computing functions, including for example one or more microprocessors, digital Signal Processing (DSP) and microprocessor combinations, etc., and a memory module may be a memory.

In addition, the device provided by the embodiment of the application can be a chip, a component or a module, wherein the chip can comprise a processor and a memory which are connected; the memory is used for storing instructions, and when the processor calls and executes the instructions, the chip can be caused to execute the vehicle mode switching control method provided by the embodiment.

The present embodiment also provides a computer-readable storage medium having stored therein computer program code which, when run on a computer, causes the computer to execute the above-described related method steps to implement a vehicle mode switching control method provided in the above-described embodiments.

The present embodiment also provides a computer program product which, when run on a computer, causes the computer to perform the above-described related steps to implement a vehicle mode switching control method provided by the above-described embodiments.

The apparatus, the computer readable storage medium, the computer program product, or the chip provided in this embodiment are used to execute the corresponding method provided above, and therefore, the advantages achieved by the apparatus, the computer readable storage medium, the computer program product, or the chip can refer to the advantages of the corresponding method provided above, which are not described herein.

It will be appreciated by those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional modules is illustrated, and in practical application, the above-described functional allocation may be performed by different functional modules according to needs, i.e. the internal structure of the apparatus is divided into different functional modules to perform all or part of the functions described above.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of modules or units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another apparatus, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims

1. A vehicle mode switching control method, characterized by being applied to a hybrid vehicle including a hybrid transmission, the hybrid transmission comprising: a first input shaft connected with a first clutch and a second input shaft connected with a second clutch, the method comprising:

When the current operation mode of the vehicle is determined to be a series mode, judging whether the vehicle meets the preset condition of switching from the series mode to an idle hybrid four-wheel drive mode or not; in the series mode, the first clutch is in an open state, the second clutch is in a closed state, an engine of the vehicle is in a normal running state, a rear drive motor of the vehicle is in a driving state, and the engine drives a front drive motor of the vehicle to rotate so that the front drive motor charges a battery pack of the vehicle;

When the vehicle is determined to meet the preset condition, controlling the first clutch to be in a slip state and controlling the second clutch to be in a closed state, so that the vehicle is switched from the series mode to the idle speed hybrid four-wheel drive mode; under the idle speed mixed driving four-wheel driving mode, the first clutch is in a sliding grinding state, the second clutch is in a closing state, the engine is in an idle speed running state, the rear driving motor is in a driving state, the engine drives the front driving motor to rotate so that the front driving motor charges the battery pack, and the engine drives the front wheels to rotate.

2. The method of claim 1, wherein the determining whether the vehicle satisfies a preset condition for switching from the series mode to an idle hybrid four-wheel drive mode comprises:

And when the current vehicle speed is smaller than the vehicle speed threshold value and the residual electric quantity of the battery pack is in the preset electric quantity range, determining that the vehicle meets the preset condition.

3. The method of claim 1, wherein after controlling the first clutch to a slipping state and controlling the second clutch to a closing state to switch the vehicle from the series mode to the idle hybrid four-drive mode comprises:

And sending a creep activation request to an automatic gearbox control unit so that the automatic gearbox control unit controls the vehicle to run according to a traditional creep strategy after detecting that the vehicle meets the traditional creep condition.

4. A method according to claim 1 or 3, wherein after said controlling said first clutch to be in a slipping state and said controlling said second clutch to be in a closing state to switch said vehicle from said series mode to said idle hybrid four-wheel drive mode, further comprising:

And controlling the precursor motor to charge the battery pack with the idle charging torque, and sending an idle load torque to an engine controller so that the engine controller controls the engine to operate with the idle load torque.

5. The method of claim 1, wherein controlling the first clutch in a slip state and controlling the second clutch in a closed state to switch the vehicle from the series mode to the idle hybrid four-drive mode comprises:

The torque load of the precursor motor is controlled to control the engine to run at a target crankshaft speed, and a switching request for switching to an idle speed hybrid four-wheel drive mode is sent to an automatic gearbox control unit, so that the automatic gearbox control unit controls the first clutch to be in a slipping state, controls the second clutch to be in a closing state, and enables the vehicle to be switched from the series mode to the idle speed hybrid four-wheel drive mode.

6. The method of claim 5, wherein controlling the engine to operate at a target crankshaft speed by controlling torque of the precursor motor comprises:

Determining a torque variation gradient of the precursor motor according to a target gear of the vehicle and a current vehicle speed;

and controlling the torque load of the precursor motor according to the current crankshaft speed, the target crankshaft speed and the torque change gradient of the engine so as to control the engine to run at the target crankshaft speed.

7. The method of claim 5, wherein the sending a switch request to an automatic transmission control unit to switch to an idle hybrid four-drive mode to cause the automatic transmission control unit to control the first clutch to be in a slip state, further comprises:

Transmitting to an automatic transmission control unit that an odd-axis target gear of the vehicle is 1 and an even-axis target gear is neutral, so that the automatic transmission control unit controls the gear of the vehicle according to the odd-axis target gear and the even-axis target gear; wherein the odd axis is the first input axis and the even axis is the second input axis.

8. A vehicle mode switching control device, characterized by being disposed in a hybrid vehicle including a hybrid transmission, the hybrid transmission comprising: a first input shaft connected with a first clutch and a second input shaft connected with a second clutch, the device comprising:

The judging module is used for judging whether the vehicle meets the preset condition of switching from the series mode to the idle speed hybrid four-wheel drive mode or not when the current operation mode of the vehicle is determined to be the series mode; in the series mode, the first clutch is in an open state, the second clutch is in a closed state, an engine of the vehicle is in a normal running state, a rear drive motor of the vehicle is in a driving state, and the engine drives a front drive motor of the vehicle to rotate so that the front drive motor charges a battery pack of the vehicle;

The control module is used for controlling the first clutch to be in a slipping state and controlling the second clutch to be in a closing state when the vehicle is determined to meet the preset condition, so that the vehicle is switched from the series mode to the idle speed hybrid four-wheel drive mode; under the idle speed mixed driving four-wheel driving mode, the first clutch is in a sliding grinding state, the second clutch is in a closing state, the engine is in an idle speed running state, the rear driving motor is in a driving state, the engine drives the front driving motor to rotate so that the front driving motor charges the battery pack, and the engine drives the front wheels to rotate.

9. A vehicle, characterized in that the vehicle comprises:

A memory for storing executable program code;

a processor for calling and running the executable program code from the memory, causing the vehicle to perform the method of any one of claims 1 to 7.

10. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program which, when executed, implements the method according to any of claims 1 to 7.