CN117799598A

CN117799598A - Vehicle ejection starting control method and device, storage medium and vehicle

Info

Publication number: CN117799598A
Application number: CN202311864269.XA
Authority: CN
Inventors: 余佳衡
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2023-12-29
Filing date: 2023-12-29
Publication date: 2024-04-02

Abstract

The embodiment of the application controls a locking mechanism of a hydraulic torque converter to be in a locking state and controls a clutch to be in an opening state when determining that a driver has ejection starting intention, so that an engine can be controlled to run at a target engine speed after an ejection starting function is activated, and a motor is controlled to run at a locked state; after the brake pedal is detected to be released, the clutch is controlled to be closed based on the current motor rotating speed of the motor; and further controlling the engine to output according to the target engine torque when it is detected that the clutch is fully closed. According to the method and the device, the hydraulic torque converter is kept in the locking state in the ejection starting process, the engine runs at the target engine rotating speed, so that after the brake pedal is released, the engine can output torque with maximum capability, and then the motor is matched to provide maximum torque output for the vehicle, and the ejection starting performance of the vehicle is improved.

Description

Vehicle ejection starting control method and device, storage medium and vehicle

Technical Field

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

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 vehicle, when the 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, with a hybrid vehicle equipped with a torque converter, the torque converter is normally in an open state at the time of launch, at which time the engine speed is not limited to be too high because the speed difference between the impeller and the turbine of the torque converter cannot be too large, resulting in a limited engine torque output capacity.

Disclosure of Invention

The application provides a vehicle ejection starting control method and device, a storage medium and a vehicle, and aims to solve the problem that an engine torque output capacity is limited when a hybrid vehicle provided with a hydraulic torque converter performs ejection starting.

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

in a first aspect, an embodiment of the present application provides a vehicle launch control method, where the method includes:

under the condition that the driver is determined to have ejection starting intention, controlling a locking mechanism of the hydraulic torque converter to be in a locking state and controlling a clutch to be in an opening state;

under the condition that the ejection starting function of the vehicle is activated, controlling the engine to run at a target engine speed, and controlling the motor to run at a locked-rotor state according to the maximum motor torque; the engine is connected with the gearbox through the clutch, the motor and the hydraulic torque converter in sequence;

under the condition that the brake pedal is detected to be released, a locking mechanism of the hydraulic torque converter is kept in a locking state, and the clutch is controlled to be closed based on the current motor rotating speed of the motor;

and controlling the engine to output according to the target engine torque when the clutch is detected to be completely closed.

In an embodiment of the present application, the method further includes:

and under the condition that the brake pedal is not released and the accelerator pedal opening is larger than a first opening 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, after the step of determining that the driver has an ejection start intention, the method further includes:

when the current driving mode of the vehicle is detected to be a preset driving mode, the electronic stabilizing system of the vehicle body is in a closed state, and the opening of the accelerator pedal is larger than a second opening threshold value, the ejection starting function is activated; wherein the second opening threshold is greater than or equal to the first opening threshold.

In an embodiment of the present application, the method further includes:

and under the condition that the driver is determined to have the ejection starting intention, if the engine is detected to be in a flameout state, controlling a starting motor to start the engine.

In an embodiment of the present application, the step of controlling the clutch to be closed based on the current motor speed of the motor includes:

and controlling the clutch to be closed under the condition that the current motor rotating speed meets the clutch closing condition.

In an embodiment of the present application, the method further includes:

under the condition that the current motor rotating speed reaches a preset motor rotating speed, determining that the current motor rotating speed meets the clutch closing condition; and the rotating speed difference value between the preset motor rotating speed and the current engine rotating speed of the engine is smaller than or equal to a rotating speed difference threshold value.

In one embodiment of the present application, the step of controlling the clutch to close includes:

when the current motor rotating speed is less than or equal to the target engine rotating speed, controlling the clutch to be closed according to a preset hydraulic gradient; the hydraulic gradient characterizes the hydraulic increment of the clutch in unit time;

and if the clutch is not completely closed under the condition that the current motor speed is larger than the target engine speed, controlling the current engine speed of the engine to follow the current motor speed until the clutch is completely closed.

In a second aspect, based on the same inventive concept, an embodiment of the present application provides a vehicle launch control apparatus, including:

the first control module is used for controlling the locking mechanism of the hydraulic torque converter to be in a locking state and controlling the clutch to be in an opening state under the condition that the driver is determined to have ejection starting intention;

the second control module is used for controlling the engine to run at the target engine speed and controlling the motor to run in a locked state according to the maximum motor torque under the condition that the ejection starting function of the vehicle is activated; the engine is connected with the gearbox through the clutch, the motor and the hydraulic torque converter in sequence;

The third control module is used for keeping the locking mechanism of the hydraulic torque converter in a locking state under the condition that the brake pedal is detected to be released, and controlling the clutch to be closed based on the current motor rotating speed of the motor;

and a fourth control module for controlling the engine to output according to a target engine torque when the clutch is detected to be fully closed.

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

the ejection starting intention determining module is used for determining that the ejection starting intention exists for the driver under the condition that the brake pedal is not released, the opening of the accelerator pedal is larger than a first opening threshold value and the brake pedal is stepped on before the accelerator pedal.

the ejection starting function activating module is used for activating the ejection starting function when the current driving mode of the vehicle is detected to be a preset driving mode, the electronic stabilizing system of the vehicle body is in a closed state, and the opening of the accelerator pedal is larger than a second opening threshold; wherein the second opening threshold is greater than or equal to the first opening threshold.

and the engine starting module is used for controlling the starting motor to start the engine if the engine is detected to be in a flameout state under the condition that the ejection starting intention exists by the driver.

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

and the clutch control submodule is used for controlling the clutch to be closed under the condition that the current motor rotating speed meets the clutch closing condition.

the closing condition determining module is used for determining that the current motor rotating speed meets the clutch closing condition under the condition that the current motor rotating speed reaches the preset motor rotating speed; and the rotating speed difference value between the preset motor rotating speed and the current engine rotating speed of the engine is smaller than or equal to a rotating speed difference threshold value.

In one embodiment of the present application, the clutch control submodule includes:

the first clutch control unit is used for controlling the clutch to be closed according to a preset hydraulic gradient under the condition that the current motor rotating speed is less than or equal to the target engine rotating speed; the hydraulic gradient characterizes the hydraulic increment of the clutch in unit time;

And the second clutch control unit is used for controlling the current engine speed of the engine to follow the current motor speed until the clutch is completely closed if the clutch is not completely closed under the condition that the current motor speed is larger than the target engine speed.

In a third aspect, based on the same inventive concept, an embodiment of the present application provides 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 method for controlling vehicle launch according to the first aspect of the present application is implemented.

In a fourth aspect, based on the same inventive concept, an embodiment of the present application provides a vehicle, including a processor and a memory, where the memory stores machine executable instructions executable by the processor, and the processor is configured to execute the machine executable instructions to implement the vehicle launch control method according to the first aspect of the present application.

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

according to the vehicle ejection starting control method, firstly, under the condition that the ejection starting intention of a driver is determined, a locking mechanism of a hydraulic torque converter is controlled to be in a locking state, and a clutch is controlled to be in an opening state; then under the condition that the ejection starting function of the vehicle is activated, controlling the engine to run at a target engine speed, and controlling the motor to run at a locked state according to the maximum motor torque; further, under the condition that the brake pedal is detected to be released, a locking mechanism of the hydraulic torque converter is kept in a locking state, and the clutch is controlled to be closed based on the current motor rotating speed of the motor; finally, when the clutch is detected to be completely closed, the engine is controlled to output according to the target engine torque. According to the method and the device, the locking mechanism of the hydraulic torque converter is kept in the locking state in the ejection starting process, the engine is controlled to operate at the target engine rotating speed, so that after the brake pedal is released, the engine can output torque with maximum capability, and then the motor is matched to provide maximum torque output for the vehicle, the power transmission efficiency is improved, meanwhile, better acceleration performance and faster power response are achieved, and the ejection starting 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 in an embodiment of the present application.

Fig. 2 is a flowchart of steps of a vehicle launch control method according to an embodiment of the present application.

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

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

Fig. 5 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, which includes an engine 101, a clutch 102, a motor 103, a torque converter 104, a transmission 105, and wheels 106, wherein the engine 101 is connected in sequence through the clutch 102, the motor 103, the torque converter 104, and the transmission 105 is connected to the wheels 106 on the left and right sides through transmission shafts, respectively, wherein the coupling or decoupling between the engine 101 and the motor 103 can be achieved by controlling the clutch 102 to be closed or opened. When the clutch 102 is in an open state, the engine 101 is separated from the motor 103, and the motor 103 alone drives the wheels 106, so that the vehicle operates in a pure electric mode; when the clutch 102 is in the closed state, the engine 101 is combined with the motor 103, and the wheels are driven by the engine 101 and the motor 103 together, so that the vehicle is operated in the hybrid mode.

The hydraulic torque converter is also called a "torque converter 104", a "turbine torque converter", and a "dynamic fluid torque converter", and is a hydraulic element mainly composed of a pump impeller, a turbine, a stator, and a lock-up mechanism (generally, a lock-up clutch), and uses hydraulic oil as a working medium. Specifically, the pump wheel is connected to the motor 103 of the vehicle, the turbine is connected to the transmission 105, and the operation states of the lock mechanism include two kinds: an open state and a locked state.

In the open state, the turbine is separated from the pump impeller, and the motor 103 drives the pump impeller to rotate, and the pump impeller drives the turbine to rotate by stirring hydraulic oil in the torque converter 104. The stator is a component existing between the pump impeller and the turbine runner for adjusting the direction of the hydraulic oil. Because the turbine and the pump wheel are in power transmission by hydraulic oil, the soft connection between the motor 103 and the transmission 105 is realized, the dynamic load of the transmission system can be reduced, the stable starting of the vehicle is ensured, and the power of the vehicle is improved through the rotation speed difference between the pump wheel and the turbine wheel. When the rotational speed difference between the pump wheel and the turbine is basically the same during the running process of the vehicle, if hydraulic oil is still needed to drive the turbine to rotate, the problem of high energy consumption is caused. In order to reduce the energy consumption, when the vehicle is running at a higher speed, the lock-up mechanism may be in a locked state, and the torque converter 104 locks the pump impeller and the turbine through the lock-up mechanism, i.e., the pump impeller and the turbine are rigidly connected, so that the pump impeller can directly transmit power to the turbine, not through hydraulic oil, and the energy consumption can be reduced.

That is, in the hybrid vehicle currently equipped with the torque converter 104, the operation state of the lock-up mechanism is usually the locked-up state when the vehicle is running at a high vehicle speed; the lock mechanism is normally in an open state when the vehicle is running or starting at a low vehicle speed.

However, when the vehicle is launched, if the torque converter 104 is in the on state, although a certain torque amplification function is performed, the speed difference between the pump impeller and the turbine is required not to be too large, otherwise, the phenomenon that the launch function is disabled due to too high oil temperature may occur, so in the related art, the rotational speed of the engine 101 is limited not to be too high, and the torque output capability of the engine 101 is limited.

Aiming at the problem that the torque output capacity of an engine is limited when the hybrid vehicle provided with the hydraulic torque converter is launched in the background art, the application aims to provide the vehicle launching control method, and the engine is controlled to run at the target engine rotating speed by keeping the locking mechanism of the hydraulic torque converter in a locking state in the launching process, so that the torque can be output at the maximum capacity after the brake pedal is released, the maximum torque output is further provided for the vehicle by matching with a motor, and the vehicle launching performance is effectively improved by realizing better acceleration performance and faster power response while improving the power transmission efficiency.

Referring to fig. 2, a vehicle launch control method according to the present application is shown, which may include the steps of:

S201: and under the condition that the driver has an ejection starting intention, controlling the locking mechanism of the hydraulic torque converter to be in a locking state and controlling the clutch to be in an opening state.

It should be noted that, the execution body of the present embodiment may be a computing service device having functions of data processing, network communication, and program running, or an electronic device having the above functions, such as a driving computer, a vehicle-mounted computer, etc., such as an ECU (Electronic Control Unit ), an HCU (Hybrid Control Unit, a hybrid vehicle controller), etc. The present embodiment will be described with HCU as an execution subject. The present embodiment is not limited to the execution subject of the vehicle.

In this embodiment, after the vehicle is started, the HCU will determine whether the driver has an ejection start intention in the start stage by acquiring the operation behavior information triggered by the user for the vehicle.

In a specific implementation, the operation behavior information may include a working state and a triggering sequence of a brake pedal and an accelerator pedal, so that when the HCU detects that the brake pedal is not released and the accelerator pedal opening is greater than a first opening threshold, and the brake pedal is stepped on before the accelerator pedal, it is determined that the driver has an ejection starting intention; 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 a trigger launch instruction to the HCU, and the HCU responds to the launch instruction to determine that the driver has launch intention.

It should be noted that, by detecting the brake master cylinder pressure, it is possible to determine whether the brake pedal is in an unclamped state. Specifically, it may be determined that the brake pedal is not released if it is detected that the master cylinder pressure is greater than or equal to the launch start pressure threshold. The ejection starting pressure threshold value represents the minimum brake master cylinder pressure that the vehicle cannot advance after the user presses the accelerator pedal, so that the vehicle can be ensured not to advance abnormally or run due to the fact that the brake master cylinder pressure is too small when the driver performs ejection starting.

In the present embodiment, after it is determined that the driver has an intention to launch, the clutch is controlled to be in an open state, so that the engine can be adjusted in speed, and the lock-up mechanism of the torque converter is controlled to be in a locked state, so that the engine and the motor can be controlled to output torque. In this way, the engine can quickly perform rotational speed adjustment and torque output after the launch function of the vehicle is activated.

In this embodiment, the HCU will also acquire the running state of the engine after determining that the driver has an ejection start intention, and then control the starter motor to start the engine when detecting that the engine is in a flameout state. Therefore, the engine is started in advance, so that the rotation speed of the engine can be regulated more quickly after the ejection starting function is activated, and the ejection starting time is effectively shortened.

The starting motor is connected with the crankshaft end of the engine and is used for starting the engine. The starting motor can be a 12V starter special for starting an engine, or a power generation and starting integrated machine with starting and power generation functions, such as an ISG motor (Integrated Starter and Generato), a BSG motor (Belt-Driven Starter Generator) and the like.

S202: under the condition that the ejection starting function of the vehicle is activated, controlling the engine to operate at a target engine speed, and controlling the motor to operate in a locked-rotor state according to the maximum motor torque.

It should be noted that, with continued reference to fig. 1, the vehicle may employ a front-wheel-driven two-drive hybrid architecture, that is, the engine, the clutch, the motor, the torque converter and the gearbox are all disposed on the front axle of the vehicle, and the engine is connected with the gearbox sequentially through the clutch, the motor and the torque converter, where the clutch may employ a K0 clutch, and the motor may employ a P2 motor. Or, the vehicle can also adopt a four-drive hybrid architecture driven front and back, and at this time, on the basis of the two-drive hybrid architecture, the rear axle of the vehicle is further provided with a P4 motor, and the P4 motor is used for driving the rear axle of the vehicle.

In this embodiment, after detecting that the driver has an ejection start intention, the HCU will acquire the working condition information of the vehicle and the operation behavior information triggered by the driver, and further determine whether to activate the ejection start function based on the working condition information and the operation behavior information.

In the embodiment, by detecting the operation behavior information, whether a driver has a need of activating the ejection starting function can be effectively judged; by acquiring the working condition information of the vehicle, whether the vehicle can currently perform ejection starting operation or not can be effectively judged, and further the operation safety of a driver is ensured.

In this embodiment, after the launch function of the vehicle is activated, the HCU will also display a prompt message on the central control panel that the launch function is activated and accompanying a corresponding prompt tone, so as to visually inform the driver that the launch of the current vehicle is possible.

In this embodiment, after the HCU activates the launch function, the clutch is already controlled in advance to be in an open state, so that the engine can be directly controlled to operate at the target engine speed, and the motor can be controlled to operate in a locked state according to the maximum motor torque.

In a specific implementation, the HCU will activate the engine speed control closed loop and send a speed follow-up request containing the target engine speed to the engine controller to cause the engine controller to respond to the speed follow-up request to perform closed loop control on the engine speed so that the engine speed stabilizes around the target engine speed in preparation for torque output.

The target engine speed represents a speed point at which the engine can output the target engine torque. The target engine torque may be set to a maximum engine torque of the engine, and the target engine speed may be obtained by performing test calibration according to the engine characteristics, for example, may be set to 3300rpm.

It should be further noted that operating the motor in a locked state at maximum motor torque indicates that the motor is outputting at maximum motor torque but the rotational speed remains zero. The reason why the engine can operate in the locked state is that the brake pedal is not released, and after the brake pedal is released, the motor rotation speed increases with an increase in the vehicle speed.

In this embodiment, in order to avoid damage to the motor caused by the locked-rotor current generated when the motor runs in the locked-rotor state for a long time, the HCU triggers timing for the activation time after the launch function is activated, and if the activation time is detected to be longer than the time threshold, the brake pedal is still not released, the motor is controlled to stop torque output, and the step of S201 is re-executed. The activation duration may be set to 4s, that is, at most, the motor is allowed to continuously operate in the locked state for 4s, and if the driver does not release the brake pedal within 4s, the ejection starting function needs to be activated again.

In this embodiment, to further shorten the time of launch, the HCU will control the clutch to switch from the open state to the slip state after detecting that the current engine speed of the engine reaches the target engine speed, so that the clutch can be closed in a shorter time after the brake pedal is released.

S203: and under the condition that the brake pedal is detected to be released, the locking mechanism of the hydraulic torque converter is kept in a locking state, and the clutch is controlled to be closed based on the current motor rotating speed of the motor.

In this embodiment, after the launch function of the vehicle is activated, the HCU can control the engine speed to rise to the target engine speed in a very short time, and control the clutch to be in a slipping state, and at this time, the driver can implement launch by just releasing the brake pedal.

In particular implementations, the HCU may determine that the brake pedal is released upon detecting that the master cylinder pressure is less than a pressure threshold. Wherein, the pressure threshold may be set to be less than or equal to the launch pressure threshold.

In this embodiment, when the HCU detects that the brake pedal is released within the duration threshold, it indicates that the vehicle is formally in a starting state, and the vehicle speed will gradually increase from zero, at this time, the HCU will keep the lock-up mechanism of the torque converter in a locked state, and simultaneously control the clutch to be closed, so that the torque output by the engine and the motor can be directly transmitted to the gearbox through the torque converter to drive the wheels to advance.

S204: in the event that complete clutch closure is detected, the engine is controlled to output according to the target engine torque.

During the closing of the clutch, the engine torque output from the engine will increase gradually with the closing degree of the clutch until the clutch is completely closed, and the engine torque output from the engine will reach the target engine torque. Wherein the target engine torque represents the maximum torque that the engine can output after the clutch is fully closed, i.e., the target engine torque may be set to the maximum engine torque.

In the embodiment, the locking mechanism of the hydraulic torque converter is kept in a locking state in the ejection starting process, and the engine is controlled to operate at the target engine speed, so that after the brake pedal is released, the engine and the motor can output torque through the hydraulic torque converter at the maximum capacity, and further the maximum torque output is provided for the vehicle together, the power transmission efficiency is improved, better acceleration performance and faster power response are realized, and the ejection starting performance of the vehicle is effectively improved.

In one possible embodiment, after the step of determining that the driver has an ejection start intention, the vehicle ejection start control method may further include the steps of:

S301: and activating an ejection starting function under the condition that the current driving mode of the vehicle is detected to be a preset driving mode, the electronic stabilizing system of the vehicle body is in a closed state, and the opening of the accelerator pedal is larger than a second opening threshold value.

In this embodiment, the working condition information of the vehicle may specifically include a current driving mode of the vehicle, ESP (Electronic Stability Program, body electronic stability system) status; the operation behavior information may specifically include an accelerator pedal opening; and the HCU can activate the ejection starting function under the condition that the current driving mode of the vehicle is detected to be a preset driving mode, the electronic stabilizing system of the vehicle body is in a closed state, and the opening of the accelerator pedal is larger than a second opening threshold value.

Note that the second opening threshold value may be set to be greater than or equal to the first opening threshold value, for example, when the first opening threshold value is set to 80%, the second opening threshold value may be set to 95%. In this way, when the driver steps on the accelerator pedal opening to 80%, the ejection start intention can be transmitted to the HCU, so that the HCU can adjust the states of the hydraulic torque converter and the clutch in advance, and the ejection start function can be activated more quickly when the driver continues to step on the accelerator pedal opening to 95%.

Furthermore, to ensure the safety of the driver and the vehicle during the ejection start process, the HCU may further obtain a safety belt state, a current gear, a current vehicle speed, an EPB (Electrical ParkBrake, electronic parking brake system) state, a current battery temperature of the power battery, and a current remaining power. And the HCU activates the ejection starting function when detecting that the current driving mode is the preset driving mode, the ESP is in a closed state, the opening of the accelerator pedal is larger than a second opening threshold value, the safety belt state is in a fastening state, the current gear is a D gear (forward gear), the EPB state is in a releasing state, the current battery temperature is higher than a temperature threshold value, and the current residual electric quantity is higher than an electric quantity threshold value.

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 preset driving mode represents a driving mode with the best power performance among a plurality of driving modes of the vehicle, so that the engine and the motor can output torque according to the maximum capability; 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 a possible embodiment, S203 may specifically include the following substeps:

s203-1: and controlling the clutch to be closed under the condition that the current motor rotating speed meets the clutch closing condition.

In this embodiment, since the torque jointly output by the engine and the motor will be greater than the brake master cylinder pressure after the brake pedal is released, the vehicle will be started forward and the current vehicle speed will increase rapidly from zero, at which time the current motor speed of the motor will also increase following the increase of the current vehicle speed until the current motor speed increases to meet the clutch closing condition, the clutch will be controlled to close so that the torque output by the engine can be transmitted to the wheels through the torque converter.

In a specific implementation, the HCU may determine that the current motor speed meets the clutch closing condition when the current motor speed reaches the preset motor speed. The rotating speed difference value between the preset motor rotating speed and the current engine rotating speed of the engine is smaller than or equal to a rotating speed difference threshold value.

It should be noted that, the clutch needs to be closed, that is, the difference between the current motor speed and the current engine speed is less than or equal to the threshold value of the difference, so if the current motor speed reaches the preset motor speed, it is noted that the clutch meets the closing condition, and at this time, the clutch can be closed.

For example, the speed difference threshold may be set to 600rpm, and further, at the target engine speed of 3300rpm, the preset motor speed may be set to 2700rpm, i.e., the preset motor speed is less than the target engine speed. Because the current engine speed is the target engine speed in the process that the current motor speed approaches the target engine speed, after the current motor speed is increased to 2700rpm, the speed difference between the current motor speed and the current engine speed can be smaller than or equal to 600rpm, and then the clutch is controlled to be closed.

In the embodiment, the judgment of the closing condition of the clutch can be realized by monitoring the current motor rotation speed, and compared with the real-time calculation of the rotation speed difference, the closing operation of the clutch can be triggered more quickly, and meanwhile, the damage to the clutch caused by the overlarge rotation speed difference at the two ends of the clutch is effectively avoided.

In one possible embodiment, S203-1 may specifically comprise the sub-steps of:

s203-1-1: and under the condition that the current motor rotating speed is less than or equal to the target engine rotating speed, controlling the clutch to be closed according to a preset hydraulic gradient.

The hydraulic gradient characterizes the increase in hydraulic pressure of the clutch per unit time. That is, the hydraulic pressure to the clutch will increase as the current motor speed increases until the clutch is fully closed.

In the embodiment, the hydraulic gradient is arranged, so that the clutch can be closed more smoothly, and the running phenomenon of the vehicle in the clutch combining process is effectively prevented.

In this embodiment, the HCU will monitor in real time whether the current motor speed is greater than the target engine speed during clutch closure. Since the current engine speed of the engine is maintained at the target engine speed when the current motor speed is less than or equal to the target engine speed, it is possible to ensure that the clutch satisfies the closing condition, and further control the clutch to perform the closing operation.

S203-1-2: and if the clutch is not completely closed under the condition that the current motor speed is larger than the target engine speed, controlling the current engine speed of the engine to follow the current motor speed until the clutch is completely closed.

In this embodiment, considering that there may be a situation that the clutch is not fully closed when the current motor speed is greater than the target engine speed, if the current engine speed is kept to be the target engine speed, the difference between the current motor speed and the current engine speed may be greater than the difference threshold, so that the clutch cannot be effectively closed, so when the HCU detects that the current motor speed is greater than the target engine speed, the HCU will acquire the clutch state, and further when the clutch is detected that the clutch is not fully closed, control the current engine speed to follow the current motor speed so as to increase the current engine speed along with the increase of the current motor speed, so that it can be continuously ensured that the difference between the two ends of the clutch is less than or equal to the difference threshold, and further control the clutch to be closed according to the hydraulic gradient.

In a specific implementation, the HCU sends a speed control command including the current motor speed to the engine controller, so that the engine controller uses the current motor speed as the target speed of the engine in response to the speed control command, and adjusts the current engine speed of the engine by using a preset PI (Proportional Integral ) control strategy so that the current engine speed follows the current motor speed.

In one example, the target engine speed is set to 3300rpm, the preset motor speed is set to 2700rpm, and after the current motor speed reaches 2700rpm, the HCU will control the clutch to close according to the hydraulic gradient and determine in real time whether the current motor speed is greater than 3300rpm. If the clutch has been fully closed before the current motor speed is increased to 3300rpm, controlling the engine to output according to the target engine torque; if the clutch is not fully closed after the current motor speed is increased to 3300rpm, the current engine speed of the engine is controlled to increase with the increase of the current motor speed, for example, the current motor speed is increased to 3400rpm, 3400rpm is taken as the target speed of the engine, and the engine speed is controlled to increase so that the current engine speed can be kept synchronous with the current engine speed until the clutch is fully closed.

In this embodiment, the current engine speed of the engine is controlled to follow the current motor speed, so that the speed difference at two ends of the clutch can be always maintained within the speed difference threshold, further damage to the clutch caused by overlarge speed difference at two ends of the clutch is effectively prevented, meanwhile, running and other phenomena of the vehicle are avoided, so that the vehicle can complete ejection starting more quickly and smoothly, and ejection starting performance of the vehicle and driving experience of a user are effectively improved.

Referring to fig. 3, a timing chart of vehicle launch control according to an embodiment of the present application is shown. In this embodiment, the whole ejection starting process may be divided into four phases: the engine speed regulation stage comprises an ejection starting preparation stage (T0-T2), an engine speed regulation stage (T2-T3), an ejection starting in-situ stage (T3-T4) and an ejection starting movement stage (T4-T6).

Launch preparation phase (T0-T2): in the period of T0-T1, because the position of the accelerator pedal is zero, namely the driver does not press the accelerator pedal, the HCU judges that the driver does not have ejection starting intention, the ejection starting function is not activated, at the moment, the engine runs at the idle speed, the K0 clutch is in a closed state, and the locking mechanism of the hydraulic torque converter is in a locking state; at the time T1, the driver starts to step on the accelerator pedal, the HCU judges that the driver has ejection starting intention, the locking mechanism of the hydraulic torque converter is controlled to be switched to a locking state, the K0 clutch is controlled to be switched to an opening state, and the ejection starting function is activated after the condition information such as a driving mode, a gear, an ESP state, the accelerator pedal opening and the like is detected to meet the preset ejection starting function activation condition at the time T2 along with the increase of the accelerator pedal opening.

Engine speed regulation stage (T2-T3): at the time T2, the ejection starting function is activated, the HCU takes the target engine speed as a target, the engine speed is controlled to rise until the time T3 reaches the target engine speed, and the speed regulation is completed; meanwhile, the motor is controlled to rise according to the maximum motor torque, and the maximum motor torque is reached until the moment T3.

Ejection starting in-situ stage (T3-T4): at the time T3, the engine speed reaches the target engine speed, at the moment, the HCU closes the control K0 clutch state from the opening state to the slipping state, stabilizes the engine speed near the target engine speed through the speed closed-loop control, and simultaneously keeps the locking mechanism of the hydraulic torque converter in a locking state; 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 motor speed and the vehicle speed start to rise, and the vehicle enters a vehicle moving stage at the moment T4.

Vehicle movement phase (T4-T6): after the vehicle enters a vehicle moving stage at the moment T4, the HCU controls the K0 clutch to be completely closed at the moment T5 based on the current motor rotating speed of the motor, and then the engine can provide maximum torque output for the vehicle through the K0 clutch according to the maximum engine torque output and the motor, so that the vehicle speed is quickly increased, and the ejection starting is completed.

In the embodiment, the locking mechanism of the hydraulic torque converter is kept in a locking state in the ejection starting process, the engine is controlled to be kept at the target rotating speed and the clutch is controlled to be in a slipping state in the engine rotating speed control stage, and when the brake pedal is detected to be released, the clutch is controlled to be quickly closed, so that the engine and the motor can output torque through the hydraulic torque converter with maximum capability, better acceleration performance and faster power response are further 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 a vehicle launch control apparatus 400, the vehicle launch control apparatus 400 including:

the first control module 401 is configured to control a locking mechanism of the torque converter to be in a locked state and control a clutch to be in an open state when it is determined that an ejection start intention exists for a driver;

the second control module 402 is configured to control the engine to operate at a target engine speed and control the motor to operate in a locked state according to a maximum motor torque when an ejection starting function of the vehicle is activated; the engine is connected with the gearbox through a clutch, a motor and a hydraulic torque converter in sequence;

A third control module 403, configured to keep the locking mechanism of the torque converter in a locked state and control the clutch to be closed based on a current motor rotational speed of the motor when the brake pedal is detected to be released;

a fourth control module 404 for controlling the engine to output the target engine torque when the clutch is detected to be fully closed.

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

the ejection starting intention determining module is used for determining that the ejection starting intention exists for the driver under the condition that the fact that the brake pedal is not released, the opening of the accelerator pedal is larger than a first opening threshold value and the brake pedal is stepped on before the accelerator pedal is detected.

the ejection starting function activating module is used for activating the ejection starting function when the current driving mode of the vehicle is detected to be a preset driving mode, the electronic stabilizing system of the vehicle body is in a closed state, and the opening of the accelerator pedal is larger than a second opening threshold value; wherein the second opening threshold is greater than or equal to the first opening threshold.

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

the closing condition determining module is used for determining that the current motor rotating speed meets the clutch closing condition under the condition that the current motor rotating speed reaches the preset motor rotating speed; the rotating speed difference value between the preset motor rotating speed and the current engine rotating speed of the engine is smaller than or equal to a rotating speed difference threshold value.

the first clutch control unit is used for controlling the clutch to be closed according to a preset hydraulic gradient under the condition that the current motor rotating speed is less than or equal to the target engine rotating speed; the hydraulic gradient represents the hydraulic increment of the clutch in unit time;

It should be noted that, the specific implementation of the vehicle launch control apparatus 400 according to the embodiment of the present application refers to the specific implementation of the vehicle launch control method set forth in the first aspect of the embodiment of the present application, and will not be described herein again.

In a third 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 vehicle 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 vehicle launch control method set forth in the first aspect of the present application, and is not described herein again.

In a fourth aspect, referring to fig. 5, there is shown a vehicle 500 including a processor 501 and a memory 502 according to an embodiment of the present application, based on the same inventive concept; the memory 502 stores machine executable instructions executable by the processor 501, and the processor 501 is configured to execute the machine executable instructions to implement the vehicle launch control method according to the first aspect of the present application.

It should be noted that, the specific embodiments of the vehicle 500 in the embodiment of the present application refer to the specific embodiments of the vehicle launch control method set forth in the first aspect of the present application, and are not described herein again.

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 vehicle launch control method, device, storage medium and vehicle provided by the invention, and specific examples are applied to illustrate the principle and implementation of the invention, and the description of the above examples is only used to help understand the method and core idea of the 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. A vehicle launch control method, the method comprising:

2. The vehicle launch control method of claim 1, wherein the method further comprises:

3. The vehicle launch control method of claim 2, wherein after the step of determining that the driver has an intention to launch, the method further comprises:

4. The vehicle launch control method of claim 1, wherein the method further comprises:

5. The vehicle launch control method of claim 1, wherein the step of controlling the clutch to be closed based on the current motor speed of the motor comprises:

6. The vehicle launch control method of claim 5, wherein the method further comprises:

7. The vehicle launch control method of claim 6, wherein the step of controlling the clutch to be closed comprises:

8. A vehicle launch control apparatus, the apparatus comprising:

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

10. A vehicle comprising a processor and a memory, the memory storing machine executable instructions executable by the processor, the processor configured to execute the machine executable instructions to implement the vehicle launch control method of any one of claims 1-7.