CN116252773A

CN116252773A - Ejection starting control method, device and system, vehicle and storage medium

Info

Publication number: CN116252773A
Application number: CN202310314917.8A
Authority: CN
Inventors: 赵晴; 孙佳新
Original assignee: Honeycomb Drive System Jiangsu Co Ltd
Current assignee: Honeycomb Drive System Jiangsu Co Ltd
Priority date: 2023-03-28
Filing date: 2023-03-28
Publication date: 2023-06-13

Abstract

The application provides an ejection starting control method, device, system, vehicle and storage medium, belonging to the technical field of vehicle control, wherein the method comprises the following steps: under the condition that the ejection starting function of the vehicle is activated, controlling the vehicle to enter an idle speed electric four-wheel drive mode, and controlling the rotating speed of the engine to rise to a target rotating speed; controlling the clutch to be closed to a slip state under the condition that the rotating speed of the engine is increased to a target rotating speed; in the event that a brake pedal release is detected, the clutch is controlled to be fully closed to switch the vehicle from the idle electric four-drive mode to the direct-drive mode. According to the method and the device, when the ejection starting function of the vehicle is activated, the rotating speed of the engine is controlled to be increased to the target rotating speed, the clutch is controlled to be closed to a sliding state, and when the brake pedal is detected to be released, the clutch is controlled to be closed completely, so that the engine can output torque quickly, the vehicle can enter a direct-drive mode at a lower speed, and hundred kilometer acceleration performance of the vehicle is effectively improved.

Description

Ejection starting control method, device and system, vehicle and storage medium

Technical Field

The present disclosure relates to the field of vehicle control technologies, and in particular, to a method, an apparatus, a system, a vehicle, and a storage medium for controlling launch.

Background

The ejection starting is an acceleration technology for regulating the rotation speed of an engine to the maximum torque output platform by utilizing a gearbox, so that the engine starts to output at the maximum torque at the moment of starting, and the optimal acceleration is realized. Compared with the traditional fuel-oil vehicle, when the four-wheel drive hybrid vehicle performs ejection starting, the driving motor and the engine are matched with each other, so that the maximum torque output is provided for the vehicle in the starting stage.

In the related art, when the four-wheel drive hybrid vehicle performs ejection starting, the four-wheel drive mode is required to be switched from the pure four-wheel drive mode to the direct drive mode, however, in the mode switching process, an engine is required to be started, and a certain time is required from the starting of the engine to the power output, so that the acceleration response time of the vehicle is longer, and the hundred kilometers acceleration performance is poorer.

Disclosure of Invention

The application provides an ejection starting control method, an ejection starting control device, an ejection starting control system, a vehicle and a storage medium, and aims to solve the problem that an engine cannot quickly output power when a four-wheel drive hybrid power vehicle performs ejection starting in the related art.

In order to solve the problems, the application adopts the following technical scheme:

in a first aspect, an embodiment of the present application provides an ejection starting control method, applied to a vehicle controller, where the method includes:

under the condition that the ejection starting function of the vehicle is activated, controlling the vehicle to enter an idle speed electric four-wheel drive mode, and controlling the rotating speed of an engine to rise to a target rotating speed; in the idle electric four-wheel drive mode, a front drive motor and a rear drive motor of the vehicle are in a driving state, the engine is in an idle state, and the clutch is in a disengaged state;

controlling the clutch to be closed to a slip state in a case where the rotational speed of the engine increases to the target rotational speed;

controlling the clutch to be fully closed to switch the vehicle from the idle electric four-drive mode to a direct-drive mode when the brake pedal is detected to be released; in the direct drive mode, the front drive motor, the rear drive motor and the engine are all in a driving state.

In an embodiment of the present application, in a case where an ejection starting function of the vehicle is activated, the method further includes, before the step of controlling the vehicle to enter an idle electric four-wheel drive mode and controlling the rotation speed of the engine to rise to the target rotation speed:

Determining whether the driver has an ejection starting intention;

under the condition that the driver is determined to have ejection starting intention, acquiring working condition information of the vehicle;

and under the condition that the working condition information meets the preset launch starting function activating condition, activating the launch starting function.

In an embodiment of the present application, the step of determining whether the driver has an ejection start intention includes:

and under the condition that the brake pedal is not released and the opening degree of the accelerator pedal is larger than the opening degree threshold value and the brake pedal is stepped on before the accelerator pedal, determining that the driver has ejection starting intention.

In an embodiment of the present application, the working condition information includes a current vehicle speed, a current gear, a safety belt state, an ESP state, an EPB state, a current battery temperature of a power battery, and a current remaining power of the vehicle;

under the condition that the working condition information meets the preset launch starting function activating condition, the launch starting function is activated, and the method comprises the following steps:

and when the current vehicle speed is smaller than a vehicle speed threshold, the current gear is a forward gear, the safety belt state is a fastening state, the ESP state is a closing state, the EPB state is a releasing state, and the ejection starting function is activated under the condition that the current battery temperature is higher than a temperature threshold and the current residual electric quantity is higher than an electric quantity threshold.

In an embodiment of the present application, under a condition that an ejection starting function of a vehicle is activated, controlling the vehicle to enter an idle electric four-wheel drive mode, and controlling a rotation speed of an engine to rise to a target rotation speed, the method includes:

under the condition that the ejection starting function of the vehicle is activated, an idle electric four-wheel drive mode activation request is sent to a gearbox controller, so that the gearbox controller responds to the idle electric four-wheel drive mode activation request to control the vehicle to enter an idle electric four-wheel drive mode;

acquiring a speed control activation request and a target rotating speed sent by the gearbox controller under the condition that the vehicle enters the idle electric four-wheel drive mode;

and sending a rotation speed following request containing the target rotation speed to an engine controller in response to the speed control activation request, so that the engine controller controls the rotation speed of the engine to rise to the target rotation speed in response to the rotation speed following request.

In an embodiment of the present application, the step of controlling the clutch to be closed to the slip state in the case where the rotational speed of the engine increases to the target rotational speed includes:

a first boost torque request is sent to the transmission controller in the event that the rotational speed of the engine increases to the target rotational speed, such that the transmission controller controls the clutch to close to a slip state in response to the first boost torque request.

In an embodiment of the present application, the step of controlling the clutch to be fully closed to switch the vehicle from the idle electric four-drive mode to the direct-drive mode in the case that the brake pedal is detected to be released includes:

determining that the brake pedal is released if the brake master cylinder pressure is detected to be less than a pressure threshold;

upon determining that the brake pedal is released, sending a second boost torque request to the transmission controller to cause the transmission controller to control the clutch to fully close in response to the second boost torque request;

upon detecting that the clutch is fully closed, it is determined that the vehicle has switched from the idle electric four-drive mode to the direct-drive mode.

In a second aspect, based on the same inventive concept, an embodiment of the present application provides an ejection starting control device, applied to a vehicle controller, where the device includes:

the first control module is used for controlling the vehicle to enter an idle speed electric four-wheel drive mode and controlling the rotating speed of the engine to rise to a target rotating speed under the condition that the ejection starting function of the vehicle is activated; in the idle electric four-wheel drive mode, a front drive motor and a rear drive motor of the vehicle are in a driving state, the engine is in an idle state, and the clutch is in a disengaged state;

A second control module for controlling the clutch to be closed to a slip state in the case that the rotational speed of the engine increases to the target rotational speed;

the third control module is used for controlling the clutch to be completely closed under the condition that the brake pedal is detected to be released, so that the vehicle is switched from the idle electric four-wheel drive mode to the direct drive mode; in the direct drive mode, the front drive motor, the rear drive motor and the engine are all in a driving state.

In an embodiment of the present application, the ejection start control device further includes:

the intention determining module is used for determining whether the driver has ejection starting intention or not;

the function activating module is used for activating the ejection starting function under the condition that the working condition information meets the preset ejection starting function activating condition.

In an embodiment of the present application, the intention determining module is specifically configured to determine that the driver has an ejection start intention when it is detected that the brake pedal is not released, the accelerator pedal opening is greater than an opening threshold, and the brake pedal is depressed prior to the accelerator pedal being depressed.

The function activating module is specifically configured to activate the ejection starting function when the current vehicle speed is less than a vehicle speed threshold, the current gear is a forward gear, the safety belt state is a fastening state, the ESP state is a closing state, the EPB state is a releasing state, and the current battery temperature is higher than a temperature threshold and the current residual electric power is higher than an electric power threshold.

In an embodiment of the present application, the first control module includes:

the activation request sending submodule is used for sending an idle electric four-wheel drive mode activation request to the gearbox controller under the condition that the ejection starting function of the vehicle is activated, so that the gearbox controller responds to the idle electric four-wheel drive mode activation request and controls the vehicle to enter the idle electric four-wheel drive mode;

a target rotation speed acquisition sub-module, configured to acquire a speed control activation request and a target rotation speed that are sent by the gearbox controller when the vehicle enters the idle electric four-wheel drive mode;

and the rotating speed following request sending submodule is used for responding to the speed control activating request and sending a rotating speed following request containing the target rotating speed to an engine controller so that the engine controller responds to the rotating speed following request and controls the rotating speed of the engine to rise to the target rotating speed.

In an embodiment of the present application, the second control module includes:

a first torque request transmitting sub-module for transmitting a first boost torque request to the transmission controller in the event that the rotational speed of the engine increases to the target rotational speed, to cause the transmission controller to control the clutch to close to a slip state in response to the first boost torque request.

In an embodiment of the present application, the third control module includes:

a first determination submodule for determining that the brake pedal is released if the brake master cylinder pressure is detected to be less than a pressure threshold;

a second torque request transmitting sub-module for transmitting a second boost torque request to the transmission controller to cause the transmission controller to control the clutch to fully close in response to the second boost torque request if the brake pedal is determined to be released;

and a second determination sub-module for determining that the vehicle has been switched from the idle electric four-drive mode to the direct-drive mode if complete closing of the clutch is detected.

In a third aspect, based on the same inventive concept, an embodiment of the present application provides an ejection starting control system, where the system includes a vehicle controller, a gearbox controller, and an engine controller; wherein,

The whole vehicle controller is used for sending an idle speed electric four-wheel drive mode activation request to the gearbox controller under the condition that the ejection starting function of the vehicle is activated;

the gearbox controller is used for responding to the idle speed electric four-wheel drive mode activation request, controlling the vehicle to enter an idle speed electric four-wheel drive mode, and sending a speed control activation request and a target rotating speed to the whole vehicle controller; in the idle electric four-wheel drive mode, a front drive motor and a rear drive motor of the vehicle are in a driving state, the engine is in an idle state, and the clutch is in a disengaged state;

the whole vehicle controller is also used for responding to the speed control activation request and sending a rotation speed following request containing the target rotation speed to an engine controller;

the engine controller is used for responding to the rotation speed following request and controlling the rotation speed of the engine to rise to the target rotation speed;

the whole vehicle controller is further used for sending a first increasing torque request to the gearbox controller under the condition that the rotating speed of the engine is increased to the target rotating speed;

the transmission controller is further configured to control the clutch to close to a slip state in response to the first boost torque request;

The whole vehicle controller is further used for sending a second heightened torque request to the gearbox controller under the condition that the brake pedal is detected to be released;

the transmission controller is further configured to control the clutch to be fully closed in response to the second boost torque request to switch the vehicle from the idle electric four-drive mode to a direct-drive mode; in the direct drive mode, the front drive motor, the rear drive motor and the engine are all in a driving state.

In a fourth aspect, based on the same inventive concept, an embodiment of the present application provides a vehicle, including the launch control system set forth in the third aspect of the present application.

In a fifth aspect, based on the same inventive concept, embodiments of the present application provide a storage medium, where machine executable instructions are stored in the storage medium, and when the machine executable instructions are executed by a processor, the ejection starting control method provided in the first aspect of the present application is implemented.

Compared with the prior art, the application has the following advantages:

the ejection starting control method provided by the embodiment of the application comprises the following steps: under the condition that the ejection starting function of the vehicle is activated, controlling the vehicle to enter an idle speed electric four-wheel drive mode, and controlling the rotating speed of the engine to rise to a target rotating speed; controlling the clutch to be closed to a slip state under the condition that the rotating speed of the engine is increased to a target rotating speed; in the event that a brake pedal release is detected, the clutch is controlled to be fully closed to switch the vehicle from the idle electric four-drive mode to the direct-drive mode. According to the method and the device, when the ejection starting function of the vehicle is activated, the rotating speed of the engine is controlled to be increased to the target rotating speed in advance, the clutch is controlled to be closed to a sliding state, when the brake pedal is detected to be released, the clutch is controlled to be closed completely, so that the engine can output torque quickly, the front drive motor and the rear drive motor are matched to provide maximum torque output for the vehicle, better acceleration performance and faster power response are achieved, the vehicle can enter a direct drive mode at a lower speed, and hundred kilometers of acceleration performance of the vehicle is effectively improved.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a hybrid vehicle according to an embodiment of the present application.

Fig. 2 is a flowchart illustrating steps of an ejection start control method according to an embodiment of the present application.

Fig. 3 is a timing chart of the launch control in an embodiment of the present application.

Fig. 4 is a schematic functional block diagram of an ejection start control device according to an embodiment of the present application.

Fig. 5 is a schematic structural diagram of an ejection start control system according to an embodiment of the present application.

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

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1, there is shown a schematic structural diagram of a hybrid vehicle in an embodiment of the present application, the hybrid vehicle including a front drive motor 101, a rear drive motor 102, an engine 103, a clutch 104, a synchronizer 105, and a differential 106; the front drive motor 101 is connected with one end of an input shaft, the other end of the input shaft is connected with the engine 103 through a clutch 104, the input shaft is connected with an output shaft through a gear set, and a transmission gear meshed with the differential 106 is connected on the output shaft; the synchronizer 105 is connected with the gear set and is used for synchronizing the rotation speeds of gears among different gears; a rear drive motor 102 is provided at the rear axle for powering the rear wheels through a rear drive transmission shaft to drive the vehicle.

Since the hybrid vehicle adopting the above-described architecture is configured with the front-drive motor 101, the rear-drive motor 102, and the engine 103 at the same time, in order to adapt to different road conditions and driving requirements, a plurality of driving modes including a direct-drive mode and a pure-four-drive mode are generally provided. In the pure four-wheel drive mode, the engine 103 is flameout, the clutch 104 is opened, the synchronizer 105 is engaged, and the front drive motor 101 and the rear drive motor 102 jointly drive the vehicle; in the direct drive mode, the clutch 104 is closed, the synchronizer 105 is engaged, and the engine 103, the front drive motor 101, and the rear drive motor 102 jointly drive the vehicle.

In the related art, when the four-wheel drive hybrid vehicle is launched, a pure electric mode is usually adopted for launching, and then the vehicle is switched from the pure electric mode to the direct-drive mode, however, because the engine 103 is in a flameout state in the pure electric mode, the engine 103 needs to be started when the mode is switched, and a certain time is required for the engine 103 to be started until the power can be output, so that the acceleration response time is longer, and the hundred kilometers acceleration performance is poorer.

Aiming at the defects existing in the background art, the application aims to provide the ejection starting control method, when the ejection starting function of the vehicle is activated, the rotation speed of the engine can be controlled to be increased to the target rotation speed in advance and the clutch is controlled to be closed to a skid-ground state by controlling the vehicle to enter an idle electric four-wheel drive mode, and further when the brake pedal is detected to be released, the clutch can be controlled to be closed completely, so that the engine can output torque quickly, the front drive motor and the rear drive motor are matched to provide maximum torque output for the vehicle, better acceleration performance and faster power response are achieved, the vehicle can enter a direct drive mode at a lower speed, and the hundred kilometers of acceleration performance of the vehicle is effectively improved.

Referring to fig. 2, an ejection starting control method applied to a vehicle controller is shown, and the method may include the following steps:

s201: under the condition that the ejection starting function of the vehicle is activated, controlling the vehicle to enter an idle speed electric four-wheel drive mode, and controlling the rotating speed of the engine to rise to a target rotating speed.

It should be noted that, unlike the conventional four-wheel drive mode in which the engine is in a flameout state, in the idle electric four-wheel drive mode, the engine will be in an idle state and the clutch will be in a disengaged state while the front drive motor and the rear drive motor are in a driving state, and at this time, the engine will be in a start state but not output torque.

In this embodiment, the vehicle controller (Vehicle Control Unit, hereinafter referred to as VCU) may intelligently identify whether the user has a launch start requirement in the start stage by detecting the user operation behavior and the working condition information of the vehicle. Specifically, whether the vehicle meets the preset launch starting function activating condition can be judged based on the user operation behavior and the working condition information of the vehicle, so that the launch starting function of the vehicle can be automatically activated without manual triggering by a user under the condition that the user operation behavior and the working condition information of the vehicle meet the preset launch starting function activating condition.

In this embodiment, the VCU will immediately control the engine speed to rise to the target speed upon determining that the vehicle enters the idle electric four-drive mode. By increasing the rotational speed of the engine to the target rotational speed, the clutch can be quickly closed, and the engine can quickly drive the input shaft to rotate when the driver releases the brake pedal to launch, so that the vehicle of the vehicle can quickly rise in a very short time.

After the launch function of the vehicle is activated, the VCU will also display a prompt message on the central control large screen that the launch function is activated and accompanying a corresponding prompt sound to visually inform the driver that the launch of the current vehicle is possible.

S202: in the case where the rotational speed of the engine increases to the target rotational speed, the clutch is controlled to be closed to the slip state.

In this embodiment, in order to further shorten the closing time of the clutch when the user performs the launch, after the rotational speed of the engine increases to the target rotational speed, the control clutch is closed to the slip state and is kept in the slip state until the user performs the launch operation.

It should be noted that, when the clutch is in a slip state and the engine and the input shaft are in a semi-coupling state, the clutch is not fully coupled, and the rotational speed difference between both ends of the clutch can be stabilized at the target rotational speed by controlling the rotational speed of the engine to be maintained at the target rotational speed.

S203: in the event that a brake pedal release is detected, the clutch is controlled to be fully closed to switch the vehicle from the idle electric four-drive mode to the direct-drive mode.

After the clutch is completely closed, the engine can directly drive the vehicle through the front axle gearbox, and meanwhile, the front drive motor and the rear drive motor are kept in a driving state. That is, in the direct drive mode, the front drive motor, the rear drive motor, and the engine can simultaneously output torque, providing maximum torque output for the vehicle, and achieving launch.

In this embodiment, since the rotational speed of the engine is controlled to be increased to the target rotational speed and the clutch is controlled to be closed to the skid-ground state before the driver releases the brake pedal, when the brake pedal is detected to be released, the clutch can be controlled to be completely closed in a shorter time and at a lower vehicle speed, so that the engine can quickly output torque, better acceleration performance and faster power response are realized, and the vehicle can enter a direct-drive mode at a lower vehicle speed, thereby effectively improving the hundred kilometers acceleration performance of the vehicle.

In a possible embodiment, before S201, the ejection start control method may further include the steps of:

S101: it is determined whether the driver has an ejection start intention.

In this embodiment, the VCU may effectively identify whether the driver has an ejection start intention by acquiring operation behavior information triggered by the user for the vehicle.

Specifically, the VCU may determine that the driver has an ejection start intention by intelligently detecting working states of the brake pedal and the accelerator pedal, and determining that the brake pedal is not released, that the accelerator pedal opening is greater than an opening threshold, and that the brake pedal is depressed before the accelerator pedal is depressed; or the driver can directly send out a voice instruction, trigger a pre-configured physical button or trigger a virtual button on a display screen, transmit an operation instruction for triggering the ejection starting function to the VCU, and respond to the operation instruction, the VCU determines that the ejection starting intention exists for the driver. The brake pedal is determined not to be released by detecting the brake master cylinder pressure and determining that the brake pedal is not released under the condition that the brake master cylinder pressure is detected to be larger than the super ejection activation threshold value. Wherein the super ejection activation threshold may be set to 80bar,1bar (bar) =100 KPa (kilopascal).

In this embodiment, the time stamp of the brake pedal and the time stamp of the depression of the accelerator pedal may be recorded, so as to determine whether the brake pedal is depressed prior to the depression of the accelerator pedal, and if so, it is described that the driver is performing the launch start operation, not the brake operation, so as to more accurately identify the operation intention of the driver.

S102: and activating the ejection starting function under the condition that the working condition information meets the preset ejection starting function activating condition.

In this embodiment, after determining that the driver has an intention to launch and start, it is further required to determine that the current operating condition information of the vehicle meets a preset launch function activation condition, so as to avoid the vehicle from forcibly launching and starting under the operating condition that the power battery is low, the vehicle gear is out of position, the safety belt is not fastened, and the like, which has a safety risk, thereby threatening the safety of the vehicle and the driver

Specifically, the operating condition information may include a current vehicle speed, a current gear, a seatbelt status, an ESP (Electronic Stability Program, body electronic stability system) status, an EPB (Electrical Park Brake, electronic parking brake system) status, a current battery temperature of the power battery, and a current remaining power amount of the vehicle. When the VCU determines that the current vehicle speed is smaller than the vehicle speed threshold, the current gear is a forward gear, the safety belt state is a fastening state, the ESP state is a closing state, the EPB state is a releasing state, and the ejection starting function is activated under the condition that the current battery temperature is higher than the temperature threshold and the current residual electric quantity is higher than the electric quantity threshold.

It should be noted that, during the process of ejection starting, normal phenomena such as vehicle tire slip may occur, so that the ESP needs to be closed, and the ESP is prevented from intervention and power output closing when the vehicle tire slips, resulting in failure of ejection starting of the vehicle; the EPB state represents the working state of the electronic hand brake, the EPB state is a closed state when the vehicle is parked, and the EPB state needs to be kept in a released state when the vehicle is driven, so that the EPB state needs to be ensured to be in the released state when the vehicle is launched, and meanwhile, the current gear of the vehicle needs to be a forward gear; the safety belt is detected to be in a fastening state, so that the driving safety of a driver can be ensured in the process of ejecting and starting the vehicle; by detecting the current speed of the vehicle, whether the vehicle is in a running state or not can be judged, and further the situation that the vehicle erroneously executes an ejection starting function in the running process is avoided; the current battery temperature and the current residual electric quantity of the power battery are obtained, so that the problem that the power battery cannot output high power required by ejection starting under abnormal working conditions such as too low electric quantity and/or too low temperature, the ejection starting fails and the power battery is damaged is effectively avoided, and the power battery can be further guaranteed to support the vehicle to finish ejection starting under normal working conditions.

In the embodiment, through intelligent identification of the user operation behavior and the working condition information of the vehicle, the ejection starting intention of the driver can be accurately identified, the safety requirements of the vehicle and the driver in ejection starting can be effectively met, and the vehicle can be smoothly ejected and started.

In a possible embodiment, S201 may specifically include the following substeps:

s201-1: and under the condition that the ejection starting function of the vehicle is activated, sending an idle electric four-wheel drive mode activation request to the gearbox controller so that the gearbox controller responds to the idle electric four-wheel drive mode activation request to control the vehicle to enter an idle electric four-wheel drive mode.

In this embodiment, in order to ensure smooth launch, when the launch function of the vehicle is activated, the VCU prohibits the brake priority function, that is, if the driver releases the brake pedal to launch, the driver will not respond to the operation if the driver detects that the brake pedal is depressed again, but will respond preferentially to the instruction triggered by the accelerator pedal; simultaneously, the VCU also requests the front drive motor and the rear drive motor to follow the driver required torque triggered by the driver through the accelerator pedal, namely, the larger the opening of the accelerator pedal triggered by the driver is, the larger the torques output by the front drive motor and the rear drive motor are.

In the embodiment, after the launch starting function of the vehicle is activated, by sending an idle electric four-wheel drive mode activation request to the gearbox controller, the gearbox controller can control the front drive motor and the rear drive motor to follow the driver required torque triggered by a driver through an accelerator pedal based on the idle electric four-wheel drive mode activation request, and control the synchronizer to be engaged in 1 st gear; while controlling the engine to start in an idle mode.

It should be noted that, the idle electric four-wheel drive mode is a transition stage before the vehicle enters the direct drive mode, so that the vehicle can be quickly switched to the direct drive mode when a driver releases a brake pedal, and after the vehicle enters the idle electric four-wheel drive mode, the VCU will send a super ejection activation state, a four-wheel drive non-activation request and a direct drive working mode request to the gearbox controller. The super ejection activation state is used for indicating the transmission controller to activate the super ejection activation state; the four-drive inactive request and the direct-drive operating mode request are used to instruct the transmission controller to switch the driving mode of the vehicle from the idle electric four-drive mode to the direct-drive mode.

In this embodiment, after acquiring the super-ejection activation state, the four-wheel-drive non-activation request, and the direct-drive operation mode request, the transmission controller sends a speed control activation request and a target rotational speed to the VCU, so as to implement engine rotational speed control.

S201-2: a speed control activation request and a target rotational speed sent by a transmission controller in the event that the vehicle enters an idle electric four-drive mode are obtained.

S201-3: in response to the speed control activation request, a speed follow-up request including the target speed is sent to the engine controller to cause the engine controller to control the speed of the engine to rise to the target speed in response to the speed follow-up request.

In this embodiment, the VCU generates a rotation speed following request including the target rotation speed based on the speed control activation request and the target rotation speed, and sends the rotation speed following request to the engine controller, and the engine controller controls the rotation speed of the engine to rise to the target rotation speed. In a specific implementation, the VCU will control the closed loop by activating the engine speed and requesting torque from the engine controller to follow the target speed sent by the transmission controller.

In the present embodiment, the engine speed is stabilized around the target speed by performing the closed-loop control of the engine speed, so that the engine speed is ready for switching to the direct drive mode.

In a possible embodiment, S202 may specifically include the following substeps:

s202-1: in the event that the rotational speed of the engine increases to the target rotational speed, a first boost torque request is sent to the transmission controller to cause the transmission controller to control the clutch to close to the slip state in response to the first boost torque request.

In this embodiment, the VCU also needs to be prepared for quick closing of the clutch after preparing for speed change, since the engine needs to pass through the clutch to output torque.

In a specific implementation, the transmission controller will control the clutch to complete the oil pre-charge based on the first boost torque request sent by the VCU, and after the clutch completes the oil pre-charge, the clutch is controlled to a slip state, i.e., a slip state, by increasing the clutch torque. After the clutch enters the slip state, the transmission controller then sends the clutch slip state information to the VCU to inform the VCU that the clutch has completed preparation for closing.

In a possible embodiment, S203 may specifically include the following substeps:

s203-1: in the event that the master cylinder pressure is detected to be less than the pressure threshold, a brake pedal release is determined.

In this embodiment, after the launch function of the vehicle is activated, the rotational speed of the engine can be controlled to rise to the target rotational speed in a very short time, and the clutch is controlled to be closed to a slip state, at this time, both the brake pedal and the accelerator pedal of the driver are in a depressed state, and the driver can launch only by releasing the brake pedal.

In a specific implementation, a pressure threshold may be set, and brake pedal release is determined in the event that a brake master cylinder pressure less than the pressure threshold is detected.

S203-2: in the event that a brake pedal release is determined, a second boost torque request is sent to the transmission controller to cause the transmission controller to control the clutch to fully close in response to the second boost torque request.

In this embodiment, when it is determined that the brake pedal is released, it is indicated that the driver needs to launch, and at this time, the VCU sends a second boost torque request to the transmission controller, so that the transmission controller can further increase the clutch torque based on the second boost torque request, and control the clutch to close from the slipping state to the fully closed state.

S203-3: in the event that complete clutch closure is detected, it is determined that the vehicle has switched from the idle electric four-drive mode to the direct-drive mode.

In this embodiment, after the clutch is completely closed, the vehicle is switched from the idle electric four-wheel drive mode to the direct-drive mode, at this time, the VCU will switch the control mode of the engine from the rotation speed control mode to the torque control mode, and control the output torque of the engine and the front motor according to the preset front axle torque distribution strategy in the direct-drive mode, and then cooperate with the rear motor to provide the maximum torque output for the vehicle together, so as to achieve better acceleration performance and faster power response, and enable the vehicle to enter the direct-drive mode at a lower vehicle speed, thereby effectively improving the hundred kilometers acceleration performance of the vehicle.

Referring to fig. 3, an exemplary ejection start control timing diagram of an embodiment of the present application is shown. In this embodiment, the whole ejection starting process can be divided into three phases: an engine speed increasing stage (T0-T3), an engine speed control stage (T3-T4), and a vehicle moving stage (T4-T6).

In the engine speed rising stage (T0-T3): in the period of T0-T1, as the position of the accelerator pedal is zero, namely the driver does not press the accelerator pedal, the VCU judges that the driver does not have ejection starting intention, and the ejection starting function is not activated; at the time T1, the driver starts to step on the accelerator pedal, the opening of the accelerator pedal is larger than the opening threshold at the time T2, at the moment, the VCU judges that the driver has ejection starting intention, and the working condition information of the vehicle including the position of a safety belt, the gear position, the EPB state and the like meets the preset ejection starting function activating condition, so that the VCU activates the ejection starting function at the time T2, controls the vehicle to enter an idle electric four-wheel drive mode, controls the front drive motor and the rear drive motor to follow the torque required by the driver, and controls the rotating speed of the engine to rise to the target rotating speed at the time T3.

During the engine speed control phase (T3-T4): in the period T3, the engine speed reaches the target speed, at the moment, the VCU closes the control clutch state from the opening state to the sliding grinding state, and the engine speed is stabilized near the target speed through the speed closed-loop control; at a certain moment in T3-T4, the driver releases the brake pedal, after the pressure of the brake master cylinder is reduced to a certain value, the pressure of the brake master cylinder is insufficient to brake the vehicle, the rotation speed of the input shaft begins to rise, and the vehicle enters a vehicle moving stage at the moment T4.

During the vehicle movement phase (T4-T6): after the vehicle enters a vehicle moving stage at the moment T4, the VCU can pass through a very short time, and the clutch is controlled to be completely closed or in a micro-skidding state at the moment T5, namely the vehicle is switched from an idle electric four-wheel drive mode to a direct drive mode at the moment T5, and then the engine can output torque through the clutch and provide maximum torque output for the vehicle in cooperation with the front drive motor and the rear drive motor.

In the embodiment, the engine is controlled to rise to the target rotating speed in the engine rotating speed rising stage, the engine is controlled to be kept at the target rotating speed in the engine rotating speed control stage, and the clutch is controlled to be in a slipping state, so that when the brake pedal is detected to be released, the clutch is controlled to be completely closed in a lower vehicle, further, better acceleration performance and faster power response are realized, and the power performance and driving fun of the whole vehicle are effectively improved.

In a second aspect, based on the same inventive concept, referring to fig. 4, an embodiment of the present application provides an ejection start control device 400, applied to a vehicle controller, where the ejection start control device 400 includes:

the first control module 401 is configured to control the vehicle to enter an idle electric four-wheel drive mode and control the rotation speed of the engine to increase to a target rotation speed when an ejection starting function of the vehicle is activated; in the idle electric four-drive mode, a front drive motor and a rear drive motor of the vehicle are in a driving state, an engine is in an idle state, and a clutch is in a separation state;

A second control module 402 for controlling the clutch to be closed to a slip state in the event that the rotational speed of the engine increases to a target rotational speed;

a third control module 403 for controlling the clutch to be fully closed to switch the vehicle from the idle electric four-drive mode to the direct-drive mode in case that the brake pedal is detected to be released; in the direct drive mode, the front drive motor, the rear drive motor and the engine are all in a driving state.

In an embodiment of the present application, the ejection start control device 400 further includes:

In an embodiment of the present application, the intention determining module is specifically configured to determine that the driver has an ejection start intention when it is detected that the brake pedal is not released, the accelerator pedal opening is greater than the opening threshold, and the brake pedal is depressed prior to the accelerator pedal.

In an embodiment of the present application, the working condition information includes a current vehicle speed, a current gear, a safety belt state, an ESP state, an EPB state, a current battery temperature of the power battery, and a current remaining power of the vehicle;

The function activating module is specifically used for activating an ejection starting function when the current vehicle speed is smaller than a vehicle speed threshold, the current gear is a forward gear, the safety belt state is a fastening state, the ESP state is a closing state, the EPB state is a releasing state, the current battery temperature is higher than a temperature threshold and the current residual electric quantity is higher than an electric quantity threshold.

In an embodiment of the present application, the first control module 401 includes:

the activation request sending submodule is used for sending an idle speed electric four-wheel drive mode activation request to the gearbox controller under the condition that the ejection starting function of the vehicle is activated, so that the gearbox controller responds to the idle speed electric four-wheel drive mode activation request and controls the vehicle to enter the idle speed electric four-wheel drive mode;

the target rotating speed acquisition submodule is used for acquiring a speed control activation request and a target rotating speed sent by the gearbox controller under the condition that the vehicle enters an idle speed electric four-wheel drive mode;

and the rotating speed following request sending submodule is used for responding to the speed control activating request and sending a rotating speed following request containing the target rotating speed to the engine controller so that the engine controller responds to the rotating speed following request and controls the rotating speed of the engine to rise to the target rotating speed.

In one embodiment of the present application, the second control module 402 includes:

a first torque request transmitting sub-module for transmitting a first boost torque request to the transmission controller in the event that the rotational speed of the engine increases to the target rotational speed, to cause the transmission controller to control the clutch to close to the slip state in response to the first boost torque request.

In an embodiment of the present application, the third control module 403 includes:

a first determination submodule for determining that the brake pedal is released in the event that the brake master cylinder pressure is detected to be less than the pressure threshold;

a second torque request transmitting sub-module for transmitting a second boost torque request to the transmission controller in the event that a brake pedal release is determined, such that the transmission controller controls the clutch to be fully closed in response to the second boost torque request;

and the second determining sub-module is used for determining that the vehicle is switched from the idle electric four-wheel drive mode to the direct drive mode when the clutch is detected to be completely closed.

It should be noted that, the specific implementation manner of the ejection start control device 400 in the embodiment of the present application refers to the specific implementation manner of the ejection start control method set forth in the first aspect of the embodiment of the present application, and is not described herein again.

In a third aspect, based on the same inventive concept, referring to fig. 5, an embodiment of the present application provides an ejection start control system 500, including a whole vehicle controller 501, a gearbox controller 502, and an engine controller 503; wherein,

the whole vehicle controller 501 is used for sending an idle speed electric four-wheel drive mode activation request to the gearbox controller 502 under the condition that the ejection starting function of the vehicle is activated;

the gearbox controller 502 is used for responding to an idle electric four-wheel drive mode activation request, controlling the vehicle to enter an idle electric four-wheel drive mode, and sending a speed control activation request and a target rotating speed to the whole vehicle controller 501; in the idle electric four-drive mode, the front drive motor 101 and the rear drive motor 102 of the vehicle are in a driving state, the engine 103 is in an idle state, and the clutch is in a disengaged state;

the vehicle controller 501 is further configured to send a speed following request including a target speed to the engine controller 503 in response to the speed control activation request;

the engine controller 503 is configured to control the rotation speed of the engine 103 to rise to a target rotation speed in response to a rotation speed follow-up request;

the vehicle controller 501 is further configured to send a first boost torque request to the gearbox controller 502 in case the rotational speed of the engine 103 increases to a target rotational speed;

The transmission controller 502 is further configured to control the clutch to close to the slip state in response to the first boost torque request;

the vehicle controller 501 is further configured to send a second boost torque request to the transmission controller 502 if a brake pedal release is detected;

the transmission controller 502 is further configured to control the clutch to be fully closed to switch the vehicle from the idle electric four-drive mode to the direct-drive mode in response to the second boost torque request; in the direct drive mode, the front drive motor 101, the rear drive motor 102, and the engine 103 are all in a driving state.

It should be noted that, the specific implementation of the ejection start control system 500 in the embodiment of the present application refers to the specific implementation of the ejection start control method set forth in the first aspect of the embodiment of the present application, and is not described herein again.

In a fourth aspect, referring to fig. 6, a vehicle 600 is provided according to an embodiment of the present application, including the launch control system according to the third aspect of the present application.

It should be noted that, the specific implementation of the vehicle 600 in the embodiment of the present application refers to the specific implementation of the launch control system set forth in the third aspect of the embodiment of the present application, and will not be described herein again.

In a fifth aspect, based on the same inventive concept, an embodiment of the present application provides a storage medium, in which a machine executable instruction is stored, where the machine executable instruction when executed by a processor implements the launch control method set forth in the first aspect of the present application.

It should be noted that, the specific implementation manner of the storage medium in the embodiment of the present application refers to the specific implementation manner of the ejection start control method set forth in the first aspect of the present application, and is not repeated herein.

It will be apparent to those skilled in the art that embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the invention may take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the invention.

Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or terminal device comprising the element.

The above describes in detail a launch control method, device, system, vehicle and storage medium provided by the present invention, and specific examples are applied to illustrate the principles and embodiments of the present invention, and the description of the above examples is only used to help understand the method and core idea of the present invention; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the idea of the present invention, the present disclosure should not be construed as limiting the present invention in summary.

Claims

1. The ejection starting control method is characterized by being applied to a whole vehicle controller, and comprises the following steps:

2. The launch control method according to claim 1, wherein, in the case where the launch function of the vehicle is activated, the vehicle is controlled to enter an idle electric four-wheel drive mode, and the rotational speed of the engine is controlled to rise to the target rotational speed, the method further comprising:

Determining whether the driver has an ejection starting intention;

3. The launch control method according to claim 2, wherein the step of determining whether the driver has an intention to launch, comprises:

4. The launch control method according to claim 2, wherein the operating condition information includes a current vehicle speed, a current gear, a seatbelt status, an ESP status, an EPB status, a current battery temperature of a power battery, and a current remaining amount of electricity of the vehicle;

5. The launch control method according to claim 1, wherein the step of controlling the vehicle to enter an idle electric four-drive mode and controlling the rotational speed of the engine to rise to a target rotational speed in the event of activation of a launch function of the vehicle, comprises:

6. The launch control method according to claim 1, wherein the step of controlling the clutch to be closed to a slip state in the case where the rotational speed of the engine increases to the target rotational speed, includes:

7. The launch control method according to claim 1, wherein the step of controlling the clutch to be fully closed to switch the vehicle from the idle electric four-drive mode to the direct-drive mode in the event that a brake pedal release is detected, comprises:

8. The ejection starting control system is characterized by comprising a whole vehicle controller, a gearbox controller and an engine controller; wherein,

9. A vehicle comprising the launch control system of claim 8.

10. A storage medium having stored therein machine executable instructions that when executed by a processor implement the launch control method of any one of claims 1-7.