A method and system for selecting and shifting gears in a vehicle

Abstract

The application provides a gear selecting and shifting assisting method and system of a vehicle. When a gear adjusting demand is detected, the engine is controlled to stop fuel injection, and the opening or closing of a first electromagnetic valve and a second electromagnetic valve is controlled to provide negative torque to the engine until the torque of the engine is less than a preset torque, the first electromagnetic valve is closed and the second electromagnetic valve is opened. The AMT gearbox is controlled to be shifted. If the gear adjusting demand is an upshift demand, the engine is controlled to stop fuel injection, and the opening or closing of the first electromagnetic valve and the second electromagnetic valve is controlled to provide negative torque to the engine until the difference between the speed of the engine and a first preset speed is less than a first preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened. If the gear adjusting demand is a downshift demand, the opening or closing of the first electromagnetic valve and the second electromagnetic valve is controlled to provide positive torque to the engine until the difference between the speed of the engine and a second preset speed is less than a second preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, and more particularly to a gear selection and shift assisting method and system for a vehicle. BACKGROUND

[0002] In a conventional vehicle, the power interruption time is reduced by shortening the time used by an Automated Mechanical Transmission (ATM) in the upshift process and the downshift process;

[0003] In the prior art, for a conventional vehicle equipped with an ATM transmission, during the upshift and downshift processes of the ATM transmission, the upshift or downshift of the ATM transmission is realized by controlling the engine to stop injecting fuel to realize torque zero or by controlling the engine to inject fuel to provide torque; however, this way of realizing upshift or downshift will result in a long gear shift time of the vehicle, thereby resulting in a long power interruption time of the vehicle and affecting the power performance of the vehicle.

[0004] Therefore, how to provide a gear selection and shift assisting method for a vehicle to shorten the gear shift time of the vehicle, thereby reducing the power interruption time of the vehicle and improving the power performance of the vehicle is a problem that the present application needs to solve urgently. SUMMARY

[0005] Therefore, how to provide a gear selection and shift assisting method for a vehicle to shorten the gear shift time of the vehicle, thereby reducing the power interruption time of the vehicle and improving the power performance of the vehicle is a problem that the present application needs to solve urgently.

[0006] The first aspect of the present application provides a gear selection and shift assisting method for a vehicle, which is applied to a controller in a gear selection and shift assisting system for a vehicle, the system further comprising an ATM transmission, an engine, a pneumatic actuator, and a high-pressure gas tank of the vehicle, the pneumatic actuator being connected to the high-pressure gas tank of the vehicle through a first electromagnetic valve and a second electromagnetic valve, and the method comprising:

[0007] When it is detected that there is a demand for gear adjustment of the vehicle, the engine is controlled to stop injecting fuel, and the first electromagnetic valve and the second electromagnetic valve are controlled to be opened or closed, so that the pneumatic actuator converts the high-pressure gas in the high-pressure gas tank of the vehicle into a negative torque required by the engine, until the torque of the engine is less than a preset torque, the first electromagnetic valve is closed and the second electromagnetic valve is opened;

[0008] A gear disengaging instruction is sent to the ATM transmission, so that the ATM transmission disengages gears based on the gear disengaging instruction;

[0009] When it is detected that the AMT gearbox completes the gear shifting, and the gear adjustment requirement is upshift requirement, the engine is controlled to stop fuel injection, and the first electromagnetic valve and the second electromagnetic valve are controlled to open or close, so that the pneumatic actuator converts high-pressure gas in the high-pressure gas tank of the vehicle into negative torque required by the engine, until the difference between the engine speed and the first preset speed is less than the first preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened, and the upshift requirement of the vehicle is completed.

[0010] When it is detected that the AMT gearbox completes the gear shifting, and the gear adjustment requirement is downshift requirement, the first electromagnetic valve and the second electromagnetic valve are controlled to open or close, so that the pneumatic actuator converts high-pressure gas in the high-pressure gas tank of the vehicle into positive torque required by the engine, until the difference between the engine speed and the second preset speed is less than the second preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened, and the downshift requirement of the vehicle is completed.

[0011] Optionally, the pneumatic actuator is composed of a crankshaft, a cylinder, a connecting rod and a piston.

[0012] When it is detected that the vehicle has a gear adjustment requirement, the engine is controlled to stop fuel injection, and the first electromagnetic valve and the second electromagnetic valve are controlled to open or close, so that the pneumatic actuator converts high-pressure gas in the high-pressure gas tank of the vehicle into negative torque required by the engine, until the torque of the engine is less than a preset torque, the first electromagnetic valve is closed and the second electromagnetic valve is opened, and the engine is provided with negative torque.

[0013] When it is detected that the vehicle has a gear adjustment requirement, a corresponding torque request is sent to the engine, so that the engine controls its torque to drop to 0 based on the torque request, and the engine stops fuel injection.

[0014] The second electromagnetic valve is controlled to be closed, and the first electromagnetic valve is controlled to open or close in real time according to the position of the piston in the cylinder, so that the pneumatic actuator converts high-pressure gas in the high-pressure gas tank of the vehicle into negative torque required by the engine, until the torque of the engine is less than a preset torque, the first electromagnetic valve is closed and the second electromagnetic valve is opened, and the engine is provided with negative torque.

[0015] Optionally, when it is detected that the AMT gearbox completes the gear shifting, and the gear adjustment requirement is a gear up requirement, the engine is controlled to stop fuel injection, and the first electromagnetic valve and the second electromagnetic valve are controlled to be opened or closed, so that the pneumatic actuator converts high-pressure gas in a high-pressure gas tank of the vehicle into negative torque required by the engine, until the difference between the engine speed and a first preset speed is less than a first preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened, the gear up requirement of the vehicle is completed, including:

[0016] When it is detected that the AMT gearbox completes the gear shifting, and the gear adjustment requirement is a gear up requirement, the engine is controlled to stop fuel injection, and the first electromagnetic valve and the second electromagnetic valve are controlled to be opened or closed, so that the pneumatic actuator converts high-pressure gas in a high-pressure gas tank of the vehicle into negative torque required by the engine, until the difference between the engine speed and a first preset speed is less than a first preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened, the gear up requirement of the vehicle is completed, including:

[0017] The second electromagnetic valve is controlled to be closed, and the first electromagnetic valve is controlled to be opened or closed in real time according to the position of the piston in the cylinder, so that the pneumatic actuator converts high-pressure gas in a high-pressure gas tank of the vehicle into negative torque required by the engine, until the difference between the engine speed and a first preset speed is less than a first preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened, the gear up requirement of the vehicle is completed, including:

[0018] Optionally, the first electromagnetic valve is controlled to be opened or closed in real time according to the position of the piston in the cylinder, so that the pneumatic actuator converts high-pressure gas in a high-pressure gas tank of the vehicle into negative torque required by the engine, including:

[0019] When it is detected that the piston reaches the piston top dead center in the cylinder, the first electromagnetic valve is opened, so that the high-pressure gas in the high-pressure gas tank of the vehicle is filled into the cylinder, and the piston starts to go up in the cylinder after reaching the piston top dead center, so as to compress the high-pressure gas in the cylinder back to the high-pressure gas tank of the vehicle, thereby forming the negative torque required by the engine;

[0020] When it is detected that the piston goes up to the piston bottom dead center in the cylinder, the first electromagnetic valve is closed, so that the gas in the cylinder is completely compressed to the high-pressure gas tank of the vehicle; wherein the piston starts to go down in the cylinder after reaching the piston bottom dead center, until reaching the piston top dead center.

[0021] Optionally, when it is detected that the AMT gearbox completes the gear shifting, and the gear adjustment requirement is a downshift requirement, the opening or closing of the first electromagnetic valve and the second electromagnetic valve is controlled in real time according to the position of the piston in the cylinder, so that the pneumatic actuator converts the high-pressure gas in the vehicle high-pressure gas tank into the positive torque required by the engine until the difference between the engine speed and the second preset speed is less than the second preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened, the positive torque provided to the engine is stopped, and the downshift requirement of the vehicle is completed; wherein the second preset speed is the speed corresponding to the target downshift gear indicated by the downshift requirement.

[0022] When it is detected that the AMT gearbox completes the gear shifting, and the gear adjustment requirement is a downshift requirement, the opening or closing of the first electromagnetic valve and the second electromagnetic valve is controlled in real time according to the position of the piston in the cylinder, so that the pneumatic actuator converts the high-pressure gas in the vehicle high-pressure gas tank into the positive torque required by the engine until the difference between the engine speed and the second preset speed is less than the second preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened, the positive torque provided to the engine is stopped, and the downshift requirement of the vehicle is completed; wherein the second preset speed is the speed corresponding to the target downshift gear indicated by the downshift requirement.

[0023] Optionally, the opening or closing of the first electromagnetic valve and the second electromagnetic valve is controlled in real time according to the position of the piston in the cylinder, so that the pneumatic actuator converts the high-pressure gas in the vehicle high-pressure gas tank into the positive torque required by the engine, including:

[0024] When the piston reaches the lower top dead center in the cylinder, the first electromagnetic valve is opened and the second electromagnetic valve is closed, so that the high-pressure gas in the vehicle high-pressure gas tank is filled into the cylinder to provide positive torque to the engine; wherein the piston starts to descend in the cylinder after reaching the lower top dead center of the piston, until the piston reaches the upper bottom dead center in the cylinder;

[0025] When it is detected that the piston reaches the upper bottom dead center, the first electromagnetic valve is closed and the second electromagnetic valve is opened, so that the gas in the cylinder is discharged from the second electromagnetic valve; the piston starts to ascend in the cylinder after reaching the upper bottom dead center of the piston, until reaching the lower top dead center of the piston.

[0026] The second aspect of the present application provides a gear selection and shifting auxiliary system for a vehicle, the system comprising a controller, an AMT gearbox, an engine, a pneumatic actuator, and a vehicle high-pressure gas tank, the pneumatic actuator being connected to the vehicle high-pressure gas tank through a first electromagnetic valve and a second electromagnetic valve;

[0027] The controller detects that the vehicle has a gear adjustment requirement, controls the engine to stop fuel injection, and controls opening or closing of the first electromagnetic valve and the second electromagnetic valve, so that the pneumatic actuator converts high-pressure gas in the high-pressure gas tank of the vehicle into negative torque required by the engine until the torque of the engine is less than a preset torque, and then the first electromagnetic valve is closed and the second electromagnetic valve is opened.

[0028] The controller sends a gear shedding instruction to the AMT gearbox, and the AMT gearbox sheds gears based on the gear shedding instruction.

[0029] The controller detects that the AMT gearbox has completed gear shedding, and the gear adjustment requirement is a gear up requirement, controls the engine to stop fuel injection, and controls opening or closing of the first electromagnetic valve and the second electromagnetic valve, so that the pneumatic actuator converts high-pressure gas in the high-pressure gas tank of the vehicle into negative torque required by the engine until a difference between the speed of the engine and a first preset speed is less than a first preset difference, and then the first electromagnetic valve is closed and the second electromagnetic valve is opened, to complete the gear up requirement of the vehicle.

[0030] The controller detects that the AMT gearbox has completed gear shedding, and the gear adjustment requirement is a gear down requirement, controls opening or closing of the first electromagnetic valve and the second electromagnetic valve, so that the pneumatic actuator converts high-pressure gas in the high-pressure gas tank of the vehicle into positive torque required by the engine until a difference between the speed of the engine and a second preset speed is less than a second preset difference, and then the first electromagnetic valve is closed and the second electromagnetic valve is opened, to complete the gear down requirement of the vehicle.

[0031] Optionally, the pneumatic actuator comprises a crankshaft, a cylinder, a connecting rod, and a piston.

[0032] The controller detects that the vehicle has a gear adjustment requirement, controls the engine to stop fuel injection, and controls opening or closing of the first electromagnetic valve and the second electromagnetic valve, so that the pneumatic actuator converts high-pressure gas in the high-pressure gas tank of the vehicle into negative torque required by the engine until the torque of the engine is less than a preset torque, and then the first electromagnetic valve is closed and the second electromagnetic valve is opened.

[0033] When it is detected that the vehicle has a gear adjustment requirement, a corresponding torque request is sent to the engine, the engine is controlled to reduce its torque to 0 based on the torque request, the engine is caused to stop and inject fuel, the second electromagnetic valve is controlled to be closed, the first electromagnetic valve is controlled to be opened or closed in real time according to the position of the piston in the cylinder, the pneumatic actuator is caused to convert high-pressure gas in a high-pressure gas tank of the vehicle into negative torque required by the engine, and when the torque of the engine is less than a preset torque, the first electromagnetic valve is closed and the second electromagnetic valve is opened, and the negative torque provided to the engine is stopped. The pneumatic actuator at least includes a piston and a cylinder.

[0034] Optionally, when it is detected that the AMT gearbox completes gear shifting and the gear adjustment requirement is a gear up requirement, the engine is controlled to stop injecting fuel, the first electromagnetic valve and the second electromagnetic valve are controlled to be opened or closed, the pneumatic actuator is caused to convert high-pressure gas in a high-pressure gas tank of the vehicle into negative torque required by the engine, and when the difference between the speed of the engine and a first preset speed is less than a first preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened, and the controller for completing the gear up requirement of the vehicle is specifically used for:

[0035] When it is detected that the AMT gearbox completes gear shifting and the gear adjustment requirement is a gear up requirement, a corresponding torque request is sent to the engine again, the engine is controlled to reduce its torque to 0 based on the torque request, the engine is caused to stop and inject fuel again, the second electromagnetic valve is controlled to be closed, the first electromagnetic valve is controlled to be opened or closed in real time according to the position of the piston in the cylinder, the pneumatic actuator is caused to convert high-pressure gas in a high-pressure gas tank of the vehicle into negative torque required by the engine, and when the difference between the speed of the engine and a first preset speed is less than a first preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened, and the negative torque provided to the engine is stopped, and the gear up requirement of the vehicle is completed. The first preset speed is a speed corresponding to a target gear up gear indicated by the gear up requirement.

[0036] Optionally, the controller for controlling the pneumatic actuator to convert high-pressure gas in a high-pressure gas tank of the vehicle into negative torque required by the engine in real time according to the position of the piston in the cylinder is specifically used for:

[0037] When it is detected that the piston reaches the piston upstroke bottom dead center in the cylinder, the first electromagnetic valve is opened, high-pressure gas in the vehicle high-pressure gas tank is filled into the cylinder, and the piston starts to go up in the cylinder after reaching the piston upstroke bottom dead center, so as to compress the high-pressure gas in the cylinder back to the vehicle high-pressure gas tank to form the required negative torque of the engine; when it is detected that the piston goes up to the piston downstroke top dead center in the cylinder, the first electromagnetic valve is closed to compress the gas in the cylinder to the vehicle high-pressure gas tank; wherein the piston starts to go down in the cylinder after reaching the piston downstroke top dead center until reaching the piston upstroke bottom dead center.

[0038] The application provides a gear selection and shift assisting method and system for a vehicle. The gear selection and shift assisting system for the vehicle comprises a controller, an AMT gearbox, an engine, a pneumatic actuator and a vehicle high-pressure gas tank. The pneumatic actuator is connected to the vehicle high-pressure gas tank through a first electromagnetic valve and a second electromagnetic valve. When the controller detects that there is a gear position adjustment demand, the controller controls the engine to stop fuel injection, controls the opening or closing of the first electromagnetic valve and the second electromagnetic valve, and controls the pneumatic actuator to convert the high-pressure gas in the vehicle high-pressure gas tank into the required negative torque of the engine until the torque of the engine is less than a preset torque, at which time the first electromagnetic valve is closed and the second electromagnetic valve is opened. A gear selection instruction is sent to the AMT gearbox, and the AMT gearbox performs gear selection based on the gear selection instruction. It can be seen that, in the case where there is a gear position adjustment demand, the application also controls the engine to enter a torque clearing stage, and the difference is that, in the application, the opening or closing of the first electromagnetic valve and the second electromagnetic valve is controlled to provide additional negative torque for the engine, so that the engine quickly completes the torque clearing stage and enters a speed adjusting stage. In the case where there is a gear upshift demand, the controller controls the engine to stop fuel injection and controls the opening or closing of the first electromagnetic valve and the second electromagnetic valve to provide additional negative torque for the engine, so that the engine torque quickly drops to the torque indicated by the gear upshift demand, and the gear is engaged, which greatly shortens the gear upshift time, reduces the vehicle power interruption time and improves the vehicle power. In the case where there is a gear downshift demand, the controller directly controls the opening or closing of the first electromagnetic valve and the second electromagnetic valve to provide additional positive torque for the engine, so that the engine speed quickly rises to the speed indicated by the gear downshift demand, and the gear is engaged, which greatly shortens the gear downshift time, reduces the vehicle power interruption time and improves the vehicle power. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute a part of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.

[0040] Figure 1 A structural schematic diagram of a gear selection and shift assisting system of a vehicle is provided for the embodiments of the present application.

[0041] Figure 2 A structural schematic diagram of a pneumatic actuator is provided for the embodiments of the present application.

[0042] Figure 3 A flow schematic diagram of a gear selection and shift assisting method of a vehicle is provided for the embodiments of the present application.

[0043] Figure 4 An example diagram of a gear selection and shift assisting method of a vehicle is provided for the embodiments of the present application.

[0044] In the above description, Figure 2 In the above description, DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments only constitute a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0046] In the present application, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitation, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or equipment including the element.

[0047] In order to better understand the technical terms involved in the embodiments of the present application, the following is explained:

[0048] AMT gearbox: electronically controlled mechanical automatic gearbox, which controls the gear selection and shifting actuator to replace the driver to perform the gear selection and shifting action of the gearbox. The gear shifting process of the AMT gearbox generally includes engine torque zero stage, gearbox gear removal stage, engine speed regulation stage and gearbox gear engagement stage.

[0049] From the above background art, it can be seen that for a conventional vehicle equipped with an AMT gearbox, during the upshift or downshift process of the AMT gearbox, the engine is controlled to stop injecting fuel to achieve torque zero, or the engine is controlled to inject fuel to provide torque, to achieve the upshift or downshift of the AMT gearbox.

[0050] Specifically, in the prior art, for a conventional vehicle equipped with an AMT gearbox, during the upshift process of the AMT gearbox, the engine is first controlled to enter the torque zero stage; during the torque zero stage of the engine, the engine is controlled to stop injecting fuel, and the engine torque is reduced to a certain torque before the gear is removed, ending the torque zero stage and entering the speed regulation stage; during the speed regulation stage of the engine, the engine is continuously controlled to stop injecting fuel and freely reduce the speed until the upshift target speed is reached, thereby achieving the corresponding upshift requirement. During the downshift process of the AMT gearbox, the engine is first controlled to enter the torque zero stage; during the torque zero stage of the engine, the engine is controlled to stop injecting fuel, and the engine torque is reduced to a certain torque before the gear is removed, ending the torque zero stage and entering the speed regulation stage; during the speed regulation stage of the engine, the engine is controlled to inject fuel to provide positive torque, so that the engine speed is quickly raised to the downshift target speed, thereby achieving the corresponding downshift requirement.

[0051] As can be seen, in the prior art, during the torque zero stage of the engine, the engine is only controlled to stop injecting fuel to achieve torque zero; during the upshift speed regulation stage of the engine, the engine is also only controlled to stop injecting fuel to achieve free speed reduction; during the downshift speed regulation stage of the engine, the engine is only controlled to inject fuel to provide positive torque to quickly raise the engine speed to the downshift target speed; this upshift and downshift method is single, and the gear shifting time of the vehicle is long, thereby causing the power interruption time of the vehicle to be long, affecting the power of the vehicle.

[0052] Therefore, the application provides a gear selection and shift assisting method and system of a vehicle, the gear selection and shift assisting system of the vehicle comprising a controller, an AMT gearbox, an engine, a pneumatic actuator and a high-pressure gas tank of the vehicle, the pneumatic actuator being connected with the high-pressure gas tank through a first electromagnetic valve and a second electromagnetic valve; when the controller detects that there is a gear adjustment demand of the vehicle, the controller controls the engine to stop fuel injection, controls the opening or closing of the first electromagnetic valve and the second electromagnetic valve, and controls the pneumatic actuator to convert the high-pressure gas in the high-pressure gas tank into a negative torque required by the engine until the torque of the engine is less than a preset torque, at which time the first electromagnetic valve is closed and the second electromagnetic valve is opened; a gear disengagement instruction is sent to the AMT gearbox, and the AMT gearbox performs gear disengagement based on the gear disengagement instruction. It can be seen that, in the case that there is a gear adjustment demand of the vehicle, the application also controls the engine to enter a torque cleaning phase, and the difference is that, in the application, the opening or closing of the first electromagnetic valve and the second electromagnetic valve is controlled to provide an additional negative torque for the engine when the engine is controlled to stop fuel injection, so that the engine quickly completes the torque cleaning phase and enters a speed regulation phase. In the case that there is a gear upshift demand of the vehicle, the controller controls the engine to stop fuel injection, controls the opening or closing of the first electromagnetic valve and the second electromagnetic valve, and provides an additional negative torque for the engine, so that the torque of the engine quickly drops to a torque indicated by the gear upshift demand, and the gear is engaged, which greatly shortens the gear upshift time, reduces the power interruption time of the vehicle, and improves the power performance of the vehicle. In the case that there is a gear downshift demand of the vehicle, the controller directly controls the opening or closing of the first electromagnetic valve and the first electromagnetic valve to provide an additional positive torque for the engine, so that the speed of the engine quickly rises to a speed indicated by the gear downshift demand, and the gear is engaged, which greatly shortens the gear downshift time, reduces the power interruption time of the vehicle, and improves the power performance of the vehicle.

[0053] Referring to Figure 1 , a structural schematic diagram of a gear selection and shift assisting system of a vehicle is shown; the gear selection and shift assisting system of the vehicle comprising a controller, an AMT gearbox, a pneumatic actuator, an engine and a high-pressure gas tank of the vehicle; the controller being communicatively connected with the ATM gearbox and the engine; the engine being connected with the ATM gearbox through a clutch; the pneumatic actuator being connected with the engine and the ATM gearbox, and the pneumatic actuator being connected with the high-pressure gas tank through a first electromagnetic valve and a second electromagnetic valve;

[0054] When the controller detects that there is a gear adjustment demand of the vehicle, the controller controls the engine to stop fuel injection, controls the opening or closing of the first electromagnetic valve and the second electromagnetic valve, and controls the pneumatic actuator to convert the high-pressure gas in the high-pressure gas tank into a negative torque required by the engine until the torque of the engine is less than a preset torque, at which time the first electromagnetic valve is closed and the second electromagnetic valve is opened;

[0055] The controller sends a gear shedding instruction to the AMT gearbox, so that the AMT gearbox performs gear shedding based on the gear shedding instruction;

[0056] When the controller detects that the AMT gearbox completes gear shedding and the gear adjustment requirement is a gear up requirement, the controller controls the engine to stop fuel injection, and controls the opening or closing of the first electromagnetic valve and the second electromagnetic valve, so that the pneumatic actuator converts the high-pressure gas in the vehicle high-pressure gas storage tank into the negative torque required by the engine, until the difference between the engine speed and the first preset speed is less than the first preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened, and the gear up requirement of the vehicle is completed.

[0057] When the controller detects that the AMT gearbox completes gear shedding and the gear adjustment requirement is a gear down requirement, the controller controls the opening or closing of the first electromagnetic valve and the second electromagnetic valve, so that the pneumatic actuator converts the high-pressure gas in the vehicle high-pressure gas storage tank into the positive torque required by the engine, until the difference between the engine speed and the second preset speed is less than the second preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened, and the gear down requirement of the vehicle is completed.

[0058] In the embodiment of the present application, the pneumatic actuator is composed of components such as a crankshaft, a cylinder, a connecting rod and a piston, as shown in Figure 2 The gear on the crankshaft is coupled with the engine gear ring, the cylinder of the pneumatic actuator is provided with a gas port 1 and a gas port 2, the first electromagnetic valve is arranged on the gas port 1, and the second electromagnetic valve is arranged on the gas port 2; the controller is connected with the first electromagnetic valve and the second electromagnetic valve through a low-voltage wire harness, for controlling the opening or closing of the first electromagnetic valve and the second electromagnetic valve.

[0059] Optionally, when it is detected that the vehicle has a gear adjustment requirement, the engine is controlled to stop fuel injection, and the opening or closing of the first electromagnetic valve and the second electromagnetic valve is controlled, so that the pneumatic actuator converts the high-pressure gas in the vehicle high-pressure gas storage tank into the negative torque required by the engine, until the torque of the engine is less than a preset torque, the first electromagnetic valve is closed and the second electromagnetic valve is opened, and the controller is specifically used for:

[0060] When it is detected that the vehicle has a gear adjustment requirement, a corresponding torque request is sent to the engine, so that the engine controls its torque to drop to 0 based on the torque request, the engine stops fuel injection, the second electromagnetic valve is controlled to be closed, and the opening or closing of the first electromagnetic valve is controlled in real time according to the position of the piston in the cylinder, so that the pneumatic actuator converts the high-pressure gas in the vehicle high-pressure gas storage tank into the negative torque required by the engine, until the torque of the engine is less than a preset torque, the first electromagnetic valve is closed and the second electromagnetic valve is opened, and the negative torque is stopped for the engine; the pneumatic actuator at least includes a piston and a cylinder.

[0061] Optionally, when it is detected that the AMT gearbox completes the gear shifting, and the gear adjustment requirement is the upshift requirement, the controller controls the engine to stop fuel injection, and controls the opening or closing of the first electromagnetic valve and the second electromagnetic valve, so that the pneumatic actuator converts the high-pressure gas in the high-pressure gas tank of the vehicle into the negative torque required by the engine, until the difference between the engine speed and the first preset speed is less than the first preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened, the negative torque provided to the engine is stopped, and the upshift requirement of the vehicle is completed.

[0062] When it is detected that the AMT gearbox completes the gear shifting, and the gear adjustment requirement is the upshift requirement, the controller re-sends the corresponding torque request to the engine, so that the engine controls its torque to drop to 0 based on the torque request, and re-stops the engine fuel injection; controls the second electromagnetic valve to be closed, and controls the opening or closing of the first electromagnetic valve in real time according to the position of the piston in the cylinder, so that the pneumatic actuator converts the high-pressure gas in the high-pressure gas tank of the vehicle into the negative torque required by the engine, until the difference between the engine speed and the first preset speed is less than the first preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened, the negative torque provided to the engine is stopped, and the upshift requirement of the vehicle is completed; wherein the first preset speed is the speed corresponding to the target upshift gear indicated by the upshift requirement.

[0063] Optionally, the controller for controlling the opening or closing of the first electromagnetic valve in real time according to the position of the piston in the cylinder, so that the pneumatic actuator converts the high-pressure gas in the high-pressure gas tank of the vehicle into the negative torque required by the engine, is specifically used for:

[0064] When it is detected that the piston reaches the piston upper stroke lower dead center in the cylinder, the first electromagnetic valve is opened, so that the high-pressure gas in the high-pressure gas tank of the vehicle is filled into the cylinder, and the piston starts to go up in the cylinder after reaching the piston upper stroke lower dead center, so as to compress the high-pressure gas in the cylinder back to the high-pressure gas tank of the vehicle, forming the negative torque required by the engine;

[0065] When it is detected that the piston goes up to the piston lower stroke upper dead center in the cylinder, the first electromagnetic valve is closed, so that the gas in the cylinder is completely compressed to the high-pressure gas tank of the vehicle; wherein the piston starts to go down in the cylinder after reaching the piston lower stroke upper dead center, until it reaches the piston upper stroke lower dead center.

[0066] Optionally, when it is detected that the AMT gearbox completes the gear shifting, and the gear adjustment requirement is the downshift requirement, the controller controls the opening or closing of the first electromagnetic valve and the second electromagnetic valve, so that the pneumatic actuator converts the high-pressure gas in the high-pressure gas tank of the vehicle into the positive torque required by the engine, until the difference between the engine speed and the second preset speed is less than the second preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened at the same time, the downshift requirement of the vehicle is completed.

[0067] When it is detected that the AMT gearbox completes the gear shifting, and the gear adjustment demand is the downshift demand, the opening or closing of the first electromagnetic valve and the second electromagnetic valve is controlled in real time according to the position of the piston in the cylinder, so that the pneumatic actuator converts the high-pressure gas in the high-pressure gas tank of the vehicle into the positive torque required by the engine, until the difference between the speed of the engine and the second preset speed is less than the second preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened, the positive torque provided for the engine is stopped, and the downshift demand of the vehicle is completed; wherein the second preset speed is the speed corresponding to the target downshift gear indicated by the downshift demand, and the pneumatic actuator at least includes a piston and a cylinder.

[0068] Optionally, the controller for controlling the opening or closing of the first electromagnetic valve and the second electromagnetic valve in real time according to the position of the piston in the cylinder, so that the pneumatic actuator converts the high-pressure gas in the high-pressure gas tank of the vehicle into the positive torque required by the engine, is specifically used for:

[0069] When the piston reaches the lower top dead center in the cylinder, the first electromagnetic valve is opened and the second electromagnetic valve is closed, so that the high-pressure gas in the high-pressure gas tank of the vehicle is filled into the cylinder to provide the positive torque for the engine; wherein the piston starts to descend in the cylinder after reaching the lower top dead center of the piston, and until the piston reaches the upper bottom dead center in the cylinder;

[0070] When it is detected that the piston reaches the upper bottom dead center, the first electromagnetic valve is closed and the second electromagnetic valve is opened, so that the gas in the cylinder is discharged from the second electromagnetic valve; the piston starts to ascend in the cylinder after reaching the upper bottom dead center of the piston, and until the piston reaches the lower top dead center.

[0071] Based on Figure 1 The vehicle's gear selection and shift assistance system is shown, and the vehicle's gear selection and shift assistance method provided by the embodiments of the present application is also provided, as shown in Figure 3 As shown in the controller applied to the vehicle's gear selection and shift assistance system, the vehicle's gear selection and shift assistance method specifically includes the following steps:

[0072] S301: In the process of vehicle operation, the vehicle is detected in real time whether there is a gear adjustment demand; if the vehicle has a gear adjustment demand, step S302 is executed.

[0073] In the process of specifically executing step S301, in the process of vehicle operation, the controller can detect in real time whether the vehicle currently has a gear adjustment demand, wherein the gear adjustment demand can be an upshift demand or a downshift demand; if it is determined that the vehicle currently has a gear adjustment demand, step S302 can be executed; if it is determined that the vehicle currently does not have a gear adjustment demand, step S301 can be continuously executed, until it is detected that the vehicle currently has a gear adjustment demand, step S302 is executed.

[0074] Specifically, the controller can detect the accelerator pedal, brake pedal and vehicle speed of the vehicle in real time; if it is detected that the accelerator pedal of the vehicle is stepped on and the vehicle speed continues to rise, it is determined that the vehicle has upshift demand; if it is detected that the brake pedal of the vehicle is stepped on and the vehicle speed continues to decrease, it is determined that the vehicle has downshift demand; if it is detected that neither the accelerator pedal nor the brake pedal of the vehicle is stepped on, it can be determined that the vehicle does not have gear adjustment demand.

[0075] S302: The controller controls the engine to stop fuel injection, and controls the opening or closing of the first electromagnetic valve and the second electromagnetic valve, so that the pneumatic actuator converts the high-pressure gas in the high-pressure gas tank of the vehicle into the negative torque required by the engine until the torque of the engine is less than the preset torque, and then the first electromagnetic valve is closed and the second electromagnetic valve is opened.

[0076] In the process of specifically executing step S302, when it is determined that the vehicle currently has gear adjustment demand, the controller controls the engine to enter the torque clearing phase. In the torque clearing phase, the engine is stopped fuel injection, and the opening or closing of the first electromagnetic valve and the second electromagnetic valve is controlled based on the current torque of the engine, so that the pneumatic actuator converts the high-pressure gas in the high-pressure gas tank of the vehicle into the negative torque required by the engine to adjust the torque of the engine until it is detected that the torque of the engine is less than the preset torque, and then the first electromagnetic valve is closed and the second electromagnetic valve is opened to stop providing negative torque to the engine. At this time, the engine ends the torque clearing phase.

[0077] It should be noted that the initial state of the first electromagnetic valve is closed, and the initial state of the second electromagnetic valve is open. The pneumatic actuator sucks in / exhausts the gas in the atmosphere into the cylinder through the crankshaft, piston and connecting rod. That is, in the initial state of the first electromagnetic valve and the second electromagnetic valve, no positive torque or negative torque is generated.

[0078] Optionally, when it is determined that the vehicle currently has gear adjustment demand, the controller sends a corresponding torque request to the engine to control the torque of the engine to drop to 0 based on the torque request, and controls the engine to stop fuel injection. The torque request indicates that the required torque is 0. The second electromagnetic valve is closed, and the opening or closing of the first electromagnetic valve is controlled in real time according to the position of the piston in the cylinder, so that the pneumatic actuator converts the high-pressure gas in the high-pressure gas tank of the vehicle into the negative torque required by the engine until the torque of the engine is less than the preset torque, and then the first electromagnetic valve is closed and the second electromagnetic valve is opened to stop providing negative torque to the engine. The pneumatic actuator at least includes a piston and a cylinder.

[0079] As an implementation manner of the embodiment of the application, the controller can open the first electromagnetic valve when it is detected that the piston reaches the piston top-dead-center in the cylinder, so that the high-pressure gas in the high-pressure gas tank of the vehicle is filled into the cylinder, and the piston starts to go up in the cylinder after reaching the piston top-dead-center, so as to compress the high-pressure gas in the cylinder back to the high-pressure gas tank of the vehicle, thereby forming the required negative torque of the engine; the first electromagnetic valve is closed when it is detected that the piston goes up to the piston bottom-dead-center in the cylinder, so that the gas in the cylinder is completely compressed to the high-pressure gas tank of the vehicle; wherein the piston starts to go down in the cylinder after reaching the piston bottom-dead-center, and goes up to the piston top-dead-center.

[0080] It should be noted that the piston bottom-dead-center is both the top-dead-center of the end of the piston going up and the top-dead-center of the start of the piston going down, and the two top-dead-centers coincide; similarly, the piston top-dead-center is both the bottom-dead-center of the end of the piston going down and the bottom-dead-center of the start of the piston going up, and the two bottom-dead-centers coincide. The first electromagnetic valve is closed at the piston bottom-dead-center, at which time there is basically no air between the piston and the cylinder, and at this time the piston starts to go down, thereby forming a vacuum extraction process and generating a negative torque for the engine; the first electromagnetic valve is opened at the piston top-dead-center, and the high-pressure gas enters the cylinder from the high-pressure gas tank of the vehicle, at which time the piston starts to go up, thereby compressing the high-pressure air in the cylinder and compressing the high-pressure air back to the high-pressure gas tank of the vehicle, thereby generating a negative torque for the engine; when the piston reaches the bottom-dead-center, the gas is basically all filled into the high-pressure gas tank of the vehicle, at which time the second electromagnetic valve is closed, and there is basically no air in the cylinder. As can be seen, the opening and closing of the first electromagnetic valve and the second electromagnetic valve are cyclically controlled according to the position of the piston in the cylinder, so that a negative torque is provided for the engine when the engine is in the torque clearing stage, so as to adjust the torque of the engine, until the torque of the engine is less than the preset torque, and the first electromagnetic valve and the second electromagnetic valve are closed at the same time, so as to stop providing the negative torque for the engine and end the torque clearing stage of the engine.

[0081] It should be noted that the controller can send corresponding PWM duty cycle signals to the first electromagnetic valve and the second electromagnetic valve through the low-voltage wire harness, so as to control the opening of the first electromagnetic valve and the second electromagnetic valve, and further control the amount of high-pressure gas entering the pneumatic actuator. The first electromagnetic valve or the second electromagnetic valve is used to receive the PWM duty cycle signal sent by the controller, so as to accurately control the amount of gas entering / exiting the cylinder of the pneumatic actuator; the high-pressure gas tank of the vehicle is used to store high-pressure gas and provide a high-pressure gas source for the pneumatic actuator. The gas can be high-pressure gas or air.

[0082] In the actual application process, in the case that it is determined that the vehicle currently has a gear adjustment demand, no matter whether the gear adjustment demand is an upshift demand or a downshift demand, the controller will first control the engine to enter the torque clearing stage; in the case that the engine is in the torque clearing stage, a torque request with a demand torque of 0 is sent to the ECU of the engine, so that after the ECU receives the torque request, the engine is controlled to stop and inject fuel, so as to reduce the engine from the current torque to 0; in the process of controlling the engine to reduce from the current torque to 0, the second electromagnetic valve can be controlled to be always closed by taking the current torque of the engine as a control condition, and the position of the piston in the cylinder is detected in real time; when it is detected that the piston reaches the piston top dead center in the cylinder, a corresponding PWM duty cycle signal can be generated according to the torque difference, and the PWM duty cycle signal is sent to the first electromagnetic valve, so that the first electromagnetic valve controls the opening degree of the first electromagnetic valve according to the PWM duty cycle indicated in the received PWM duty cycle signal, so as to fill the high-pressure gas in the high-pressure gas tank of the vehicle into the cylinder; when it is detected that the piston moves up to the piston bottom dead center in the cylinder, a PWM duty cycle signal with a PWM duty cycle of 0 is sent to the first electromagnetic valve, so as to close the first electromagnetic valve; in the case that the second electromagnetic valve is always closed, the opening or closing of the first electromagnetic valve is controlled in a loop by the above-mentioned manner, so as to provide negative torque for the engine, until the torque of the engine is less than the preset torque, and at the same time, the first electromagnetic valve is closed and the second electromagnetic valve is opened, so as to stop providing negative torque for the engine, and the engine ends the torque clearing stage.

[0083] In some embodiments, the torque difference is a difference between a torque before the engine enters the torque clearing stage and a torque corresponding to a target gear indicated by the gear adjustment demand; wherein the target gear can be a target upshift gear or a target downshift gear.

[0084] It should be noted that the greater the torque difference is, the greater the PWM duty cycle indicated in the generated PWM duty cycle information is, and correspondingly, the greater the opening degree of the battery valve is; the correspondence between the torque difference and the PWM duty cycle and the correspondence between the PWM duty cycle and the opening degree of the electromagnetic valve can be set according to actual application, so that after the torque difference is calculated, the PWM duty cycle corresponding to the calculated torque difference can be determined according to the correspondence between the torque difference and the PWM duty cycle, and then the opening degree of the first electromagnetic valve is controlled according to the determined PWM duty cycle based on the correspondence between the PWM duty cycle and the opening degree of the electromagnetic valve. The correspondence between the torque difference and the PWM duty cycle and the correspondence between the PWM duty cycle and the opening degree of the electromagnetic valve can be set according to actual application, which is not limited herein.

[0085] It should be noted that the preset torque can be set according to actual application, which is not limited herein.

[0086] S303: sending a gear disengaging instruction to the AMT gearbox, so that the AMT gearbox disengages gears based on the gear disengaging instruction.

[0087] In the process of specifically executing step S303, after the engine ends the torque clearing stage, the controller can send a gear disengaging instruction to the TCU of the AMT gearbox, so that the TCU controls the AMT gearbox to perform a corresponding gear disengaging operation after receiving the gear disengaging instruction.

[0088] S304: when it is detected that the AMT gearbox completes the gear disengaging, determining whether the gear adjusting demand is a gear up demand or a gear down demand; if it is the gear up demand, executing step S305; if it is the gear down demand, executing step S306.

[0089] In the process of specifically executing step S304, after the controller detects that the AMT gearbox completes the corresponding gear disengaging operation, it can further determine whether the gear adjusting demand is the gear up demand or the gear down demand; if it is the gear up demand, step S305 can be executed to enter a corresponding gear up adjusting speed stage and complete the corresponding gear up demand in the gear up adjusting speed stage; if it is the gear down demand, step S306 can be executed to enter a corresponding gear down adjusting speed stage and complete the corresponding gear down demand in the gear down adjusting speed stage.

[0090] S305: controlling the engine to stop fuel injection, and controlling the opening or closing of the first electromagnetic valve and the second electromagnetic valve, so that the pneumatic actuator converts the high-pressure gas in the high-pressure gas tank of the vehicle into the negative torque required by the engine, until the difference between the engine speed and the first preset speed is less than the first preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened, and the gear up demand of the vehicle is completed.

[0091] In the process of specifically executing step S305, when it is determined that the AMT gearbox completes the gear disengaging and the gear adjusting demand is the gear up demand, the controller controls the engine to enter the gear up adjusting speed stage, controls the engine to stop fuel injection again while the engine is in the gear up adjusting speed stage, and controls the opening or closing of the first electromagnetic valve and the second electromagnetic valve based on the difference between the current engine speed and the first preset speed, so that the pneumatic actuator converts the high-pressure gas in the high-pressure gas tank of the vehicle into the negative torque required by the engine, accelerates the speed of the engine speed drop, until it is detected that the difference between the engine speed and the first preset speed is less than the first preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened, and the negative torque provided for the engine is stopped, at this time the engine ends the gear up adjusting speed stage. The first preset speed is the speed corresponding to the target gear up gear indicated by the gear up demand.

[0092] It should be noted that the first preset difference can be set according to actual application, which is not limited in the embodiment of the present application.

[0093] Optionally, in the case of determining that the gear adjustment requirement is an upshift requirement, the controller re-sends a corresponding torque request to the engine, so that the engine controls its torque to drop to 0 based on the torque request, re-stops the engine for injection, wherein the torque request indicates that the required torque is 0; controls the first electromagnetic valve to be opened or closed in real time according to the position of the piston in the cylinder, controls the second electromagnetic valve to be closed, and controls the pneumatic actuator to convert the high-pressure gas in the vehicle high-pressure gas storage tank into the negative torque required by the engine until the difference between the engine speed and the first preset speed is less than the first preset difference, then closes the first electromagnetic valve and opens the second electromagnetic valve, stops providing the negative torque to the engine, and completes the upshift requirement of the vehicle.

[0094] As an implementation manner of the embodiment of the application, the controller can open the first electromagnetic valve when detecting that the piston reaches the piston top-dead-center (TDC) in the cylinder, so that the high-pressure gas in the vehicle high-pressure gas storage tank is filled into the cylinder, and the piston starts to go up in the cylinder after reaching the piston TDC to compress the high-pressure gas in the cylinder back to the vehicle high-pressure gas storage tank to form the negative torque required by the engine; the first electromagnetic valve is closed when detecting that the piston goes up to the piston bottom-dead-center (BDC) in the cylinder, so that the gas in the cylinder is completely compressed to the vehicle high-pressure gas storage tank; wherein the piston starts to go down in the cylinder after reaching the piston BDC until reaching the piston TDC.

[0095] It should be noted that the first electromagnetic valve is closed at the piston BDC, at this time, there is basically no air between the piston and the cylinder, at this time, the piston starts to go down, which forms a vacuum extraction process and generates a negative torque for the engine; the first electromagnetic valve is opened at the piston TDC, the high-pressure gas enters the cylinder from the vehicle high-pressure gas storage tank, at this time, the piston starts to go up, which compresses the high-pressure air in the cylinder and compresses the high-pressure air back to the vehicle high-pressure gas storage tank, so that the engine generates a negative torque; when the piston reaches the BDC, the gas is basically completely filled into the vehicle high-pressure gas storage tank, at this time, the second electromagnetic valve is closed, and there is basically no air in the cylinder. As can be seen, the opening and closing of the first electromagnetic valve and the second electromagnetic valve are cyclically controlled according to the position of the piston in the cylinder, so that the negative torque is additionally provided for the engine when the engine is in the upshift speed regulation stage, the speed of the engine is accelerated, until the difference between the engine speed and the first preset speed is less than the first preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened at the same time, the negative torque provided for the engine is stopped, and the engine ends the upshift speed regulation stage.

[0096] In the actual application process, when the AMT gearbox completes the gear shifting and the gear adjustment requirement is the upshift requirement, the controller controls the engine to enter the upshift speed regulation stage; in the upshift speed regulation stage of the engine, the torque request of 0 is re-sent to the ECU of the engine, so that after the ECU receives the torque request, the engine stop injection is controlled to reduce the engine from the current torque to 0; in the process of controlling the engine to reduce from the current torque to 0, the difference between the current speed of the engine and the first preset speed can be used as a control condition to control the second electromagnetic valve to be closed all the time, and the position of the piston in the cylinder is detected in real time; when it is detected that the piston reaches the piston top dead center in the cylinder, the corresponding PWM duty cycle signal can be generated according to the first speed difference, and the PWM duty cycle signal is sent to the first electromagnetic valve, so that the first electromagnetic valve controls the opening degree of the opening according to the PWM duty cycle indicated in the received PWM duty cycle signal, so as to fill the high-pressure gas in the vehicle high-pressure gas tank into the cylinder; when it is detected that the piston uplink reaches the piston downlink top dead center in the cylinder, the PWM duty cycle signal with the PWM duty cycle of 0 is sent to the first electromagnetic valve to close the first electromagnetic valve; in the case of closing the second electromagnetic valve all the time, the opening or closing of the first electromagnetic valve is controlled in a loop by the above-mentioned manner to provide negative torque for the engine, speed up the speed of the engine, and stop providing negative torque for the engine when it is detected that the difference between the speed of the engine and the first preset speed is less than the first preset difference, at the same time, the first electromagnetic valve and the second electromagnetic valve are closed, and the engine ends the upshift speed regulation stage.

[0097] In some embodiments, the first speed difference is the difference between the engine speed when the AMT gearbox completes the gear shifting and the speed corresponding to the target upshift gear.

[0098] It should be noted that the greater the speed difference, the greater the PWM duty cycle indicated in the generated PWM duty cycle information, and accordingly, the greater the opening degree of the battery valve; the correspondence between the speed difference and the PWM duty cycle and the PWM duty cycle and the electromagnetic valve opening degree can be set according to the actual application, so that after the first speed difference is calculated, the PWM duty cycle corresponding to the first speed difference calculated at the moment can be determined according to the correspondence between the speed difference and the PWM duty cycle, and then the opening degree of the first electromagnetic valve is controlled according to the determined PWM duty cycle based on the correspondence between the PWM duty cycle and the electromagnetic valve opening degree. The correspondence between the speed difference and the PWM duty cycle and the PWM duty cycle and the electromagnetic valve opening degree can be set according to the actual application, which is not limited herein.

[0099] S306: controlling opening or closing of the first electromagnetic valve and the second electromagnetic valve, so that the pneumatic actuator converts high-pressure gas in the high-pressure gas tank of the whole vehicle into positive torque required by the engine until the difference between the speed of the engine and the second preset speed is less than the second preset difference, and meanwhile the first electromagnetic valve is closed and the second electromagnetic valve is opened, so as to complete the downshift demand of the vehicle.

[0100] In the process of specifically performing step S306, in a case where it is determined that the AMT gear shifting is completed and the gear adjustment demand is a gear demand, the controller controls the engine to enter a downshift speed regulation phase; in the downshift speed regulation phase of the engine, the difference between the current speed of the engine and the second preset speed is taken as a control condition to control opening or closing of the first electromagnetic valve and the second electromagnetic valve, so that the pneumatic actuator converts high-pressure gas in the high-pressure gas tank of the whole vehicle into positive torque required by the engine to accelerate the speed of the engine, until it is detected that the difference between the speed of the engine and the second preset speed is less than the second preset difference, and meanwhile the first electromagnetic valve is closed and the second electromagnetic valve is opened, so as to stop providing positive torque for the engine, and at this time the engine ends the downshift speed regulation phase. The second preset speed is a speed corresponding to a target downshift gear indicated by the downshift demand.

[0101] It should be noted that the second preset difference can be set according to actual application, which is not limited in the embodiment of the present application.

[0102] Optionally, opening or closing of the first electromagnetic valve and the second electromagnetic valve is controlled in real time according to the position of the piston in the cylinder, so that the pneumatic actuator converts high-pressure gas in the high-pressure gas tank of the whole vehicle into positive torque required by the engine until the difference between the speed of the engine and the second preset speed is less than the second preset difference, and meanwhile the first electromagnetic valve is closed and the second electromagnetic valve is opened, so as to stop providing positive torque for the engine, and complete the downshift demand of the vehicle.

[0103] As an implementation manner of the embodiment of the present application, the controller can open the first electromagnetic valve and close the second electromagnetic valve when the piston reaches the bottom dead center of the cylinder, so that high-pressure gas in the high-pressure gas tank of the whole vehicle is filled into the cylinder to provide positive torque for the engine; wherein the piston starts to descend in the cylinder after reaching the bottom dead center of the piston, until the piston reaches the top dead center of the cylinder; when it is detected that the piston reaches the top dead center, the first electromagnetic valve is closed and the second electromagnetic valve is opened, so that the gas in the cylinder is discharged from the second electromagnetic valve; the piston starts to ascend in the cylinder after reaching the top dead center of the piston, until reaching the bottom dead center of the piston.

[0104] It should be noted that, in the piston downstroke top dead center, the first electromagnetic valve is opened and the second electromagnetic valve is closed, and the high-pressure gas in the vehicle high-pressure gas tank will be filled into the cylinder with the piston downstroke, thereby generating a positive torque for the engine; in the piston upstroke bottom dead center, the first electromagnetic valve is closed and the second electromagnetic valve is opened, and the high-pressure gas or air in the cylinder will be slowly discharged from the cylinder with the piston downstroke. As can be seen, according to the position of the piston in the cylinder, the opening and closing of the first electromagnetic valve and the second electromagnetic valve are cyclically controlled, so that additional positive torque can be provided for the engine in the engine speed regulation stage, the speed of the engine speed rising is accelerated, and when the difference between the engine speed and the second preset speed is less than the second preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened, the positive torque provided for the engine is stopped, and at this time the engine ends the speed regulation stage and completes the corresponding downshift demand.

[0105] In actual application, when the AMT gearbox completes the shift, and the gear adjustment demand is a downshift demand, the controller controls the engine to enter the downshift speed regulation stage; in the engine speed regulation stage, the difference between the current engine speed and the second preset speed is used as a control condition, and the position of the piston in the cylinder is detected in real time; when the piston reaches the piston downstroke top dead center in the cylinder, the second electromagnetic valve can be closed, and a corresponding PWM duty cycle signal can be generated according to the second speed difference, the PWM duty cycle signal is sent to the first electromagnetic valve, so that the first electromagnetic valve controls the opening degree of the first electromagnetic valve according to the PWM duty cycle indicated in the received PWM duty cycle signal, so as to fill the high-pressure gas in the vehicle high-pressure gas tank into the cylinder; when the piston reaches the upstroke bottom dead center in the cylinder, a PWM duty cycle signal with a PWM duty cycle of 0 is sent to the first electromagnetic valve to close the first electromagnetic valve, and a corresponding PWM duty cycle signal is generated according to the second speed difference and sent to the second electromagnetic valve, so that the second electromagnetic valve controls the opening degree of the second electromagnetic valve according to the PWM duty cycle indicated in the received PWM duty cycle signal, so that the high-pressure gas or air in the cylinder will be slowly discharged from the cylinder with the piston downstroke; through the above-mentioned cyclic control of the opening or closing of the first electromagnetic valve and the second electromagnetic valve, positive torque is provided for the engine, the speed of the engine speed rising is accelerated, and when the difference between the engine speed and the second preset speed is less than the second preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened, the positive torque provided for the engine is stopped, and at this time the engine ends the speed regulation stage, that is, the corresponding downshift demand is completed.

[0106] In some embodiments, the second speed difference is the difference between the engine speed when the AMT gearbox completes the shift and the speed corresponding to the target downshift gear.

[0107] It should be noted that the greater the speed difference value, the greater the PWM duty cycle indicated in the generated PWM duty cycle information, and accordingly, the greater the opening degree of the battery valve; the correspondence between the speed difference value and the PWM duty cycle and the PWM duty cycle and the electromagnetic valve opening degree can be set according to actual application, so that after the second speed difference value is calculated, the PWM duty cycle corresponding to the second speed difference value calculated at present can be determined according to the correspondence between the speed difference value and the PWM duty cycle, and then the opening degree of the first electromagnetic valve or the second electromagnetic valve is controlled according to the determined PWM duty cycle based on the correspondence between the PWM duty cycle and the electromagnetic valve opening degree.

[0108] The application provides a gear selection and shift assisting method of a vehicle. The gear selection and shift assisting system of the vehicle includes a controller, an AMT gearbox, an engine, a pneumatic actuator, and a high-pressure gas tank of the vehicle. The pneumatic actuator is connected to the high-pressure gas tank of the vehicle through a first electromagnetic valve and a second electromagnetic valve. When the controller detects that there is a gear adjustment demand of the vehicle, the controller controls the engine to stop fuel injection, controls the opening or closing of the first electromagnetic valve and the second electromagnetic valve, and controls the pneumatic actuator to convert the high-pressure gas in the high-pressure gas tank of the vehicle into a negative torque required by the engine until the torque of the engine is less than a preset torque. Then, the first electromagnetic valve is closed and the second electromagnetic valve is opened. A gear disengaging instruction is sent to the AMT gearbox, and the AMT gearbox performs gear disengaging based on the gear disengaging instruction. It can be seen that in the case where there is a gear adjustment demand of the vehicle, the application also controls the engine to enter a torque cleaning phase. The difference is that the application controls the opening or closing of the first electromagnetic valve and the second electromagnetic valve to provide an additional negative torque for the engine when the engine stops fuel injection, so that the engine quickly completes the torque cleaning phase and enters a speed adjusting phase. In the case where there is a gear upshift demand of the vehicle, the controller controls the engine to stop fuel injection and controls the opening or closing of the first electromagnetic valve and the second electromagnetic valve to provide an additional negative torque for the engine, so that the torque of the engine quickly drops to a torque indicated by the gear upshift demand when the gear is engaged. The time of gear upshift is greatly shortened, thereby reducing the time of power interruption of the vehicle and improving the power performance of the vehicle. In the case where there is a gear downshift demand of the vehicle, the controller directly controls the opening or closing of the first electromagnetic valve and the first electromagnetic valve to provide an additional positive torque for the engine, so that the speed of the engine quickly rises to a speed indicated by the gear downshift demand when the gear is engaged. The time of gear downshift is greatly shortened, thereby reducing the time of power interruption of the vehicle and improving the power performance of the vehicle.

[0109] In order to better understand the gear selection and shift assisting method of the vehicle provided by the application, the following is explained by way of example, as shown in Figure 4 .

[0110] A1: During the operation of the vehicle, the controller detects in real time whether there is a demand for upshift or downshift; if there is a demand for upshift, step A2 is performed; if there is a demand for downshift, A9 is performed.

[0111] A2: The controller controls the engine to stop fuel injection, controls the second electromagnetic valve to be closed all the time, and controls the first electromagnetic valve to be opened or closed according to the position of the piston in the cylinder, so that the pneumatic actuator converts the high-pressure gas in the high-pressure gas tank of the vehicle into the negative torque required by the engine.

[0112] A3: The controller detects in real time whether the torque of the engine is less than a preset torque; if not, return to perform A2, if yes, perform A4.

[0113] A4: The controller closes the first electromagnetic valve and opens the second electromagnetic valve, so that the engine ends the torque clearing phase.

[0114] A5: The controller sends a gear disengagement command to the AMT gearbox, so that the AMT gearbox disengages gears based on the gear disengagement command, and after the AMT gearbox completes the gear disengagement, enters the upshift speed regulation phase.

[0115] A6: The controller controls the engine to stop fuel injection, controls the second electromagnetic valve to be closed all the time, and controls the first electromagnetic valve to be opened or closed according to the position of the piston in the cylinder, so that the pneumatic actuator converts the high-pressure gas in the high-pressure gas tank of the vehicle into the negative torque required by the engine.

[0116] A7: The controller detects in real time whether the difference between the engine speed and the first preset speed is less than the first preset difference; if not, return to perform A6; if yes, perform A8.

[0117] A8: The controller closes the first electromagnetic valve and opens the second electromagnetic valve, so that the engine ends the upshift speed regulation phase and completes the corresponding upshift demand.

[0118] A9: The controller controls the engine to stop fuel injection, controls the second electromagnetic valve to be closed all the time, and controls the first electromagnetic valve to be opened or closed according to the position of the piston in the cylinder, so that the pneumatic actuator converts the high-pressure gas in the high-pressure gas tank of the vehicle into the negative torque required by the engine.

[0119] A10: The controller detects in real time whether the torque of the engine is less than a preset torque; if not, return to perform A9, if yes, perform A11.

[0120] A11: The controller closes the first electromagnetic valve and opens the second electromagnetic valve, so that the engine ends the torque clearing phase.

[0121] A12: the controller sends a gear shedding instruction to the AMT gearbox, so that the AMT gearbox performs gear shedding based on the gear shedding instruction, and after the AMT gearbox completes the gear shedding, enters a gear down speed regulation stage.

[0122] A13: the controller controls the opening or closing of the first electromagnetic valve and the second electromagnetic valve according to the position of the piston in the cylinder, so that the pneumatic actuator converts the high-pressure gas in the vehicle high-pressure gas storage tank into the positive torque required by the engine.

[0123] A14: the controller detects whether the difference between the engine speed and the second preset speed is less than the second preset difference value in real time; if not, return to execute A13; if yes, execute A15.

[0124] A15: the controller closes the first electromagnetic valve and opens the second electromagnetic valve, so that the engine ends the gear down speed regulation stage and completes the corresponding gear down requirement.

[0125] Each of the embodiments in the specification is described in a progressive manner, and the same and similar parts of each embodiment can be referred to each other. Each embodiment focuses on the difference from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, it is described more simply, and the related parts can be referred to the part of the method embodiment. The above-described system and system embodiment are only illustrative, and the units described as separate components can be or can not be physically separated, and the components shown as units can be or can not be physical units, that is, they can be located in one place or distributed on multiple network units. Part or all of the modules can be selected to achieve the purpose of the embodiment according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0126] The skilled person can further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware, computer software or a combination of both. In order to clearly illustrate the interchangeability of hardware and software, the components and steps of each example have been described in the above description. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. Skilled persons can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0127] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Therefore, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0128] The above is only the preferred embodiment of the present application, it should be pointed out that, for those skilled in the art, without departing from the principles of the present application, can also make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A method of selecting and shifting assistance for a vehicle, characterized by, The application relates to a controller applied to a gear selection and shifting auxiliary system of a vehicle, the system further comprising an AMT gearbox, an engine, a pneumatic actuator and a high-pressure gas tank of the vehicle, the pneumatic actuator being connected with the high-pressure gas tank of the vehicle through a first electromagnetic valve and a second electromagnetic valve, and the method comprises the following steps: when detecting that the vehicle has a gear adjustment demand, controlling the engine to stop fuel injection, and through controlling the opening or closing of the first electromagnetic valve and the second electromagnetic valve, the pneumatic actuator converts high-pressure gas in the high-pressure gas tank of the vehicle into negative torque required by the engine until the torque of the engine is less than a preset torque, then the first electromagnetic valve is closed and the second electromagnetic valve is opened; sending a gear disengagement instruction to the AMT gearbox, so that the AMT gearbox disengages gears based on the gear disengagement instruction; when detecting that the AMT gearbox completes gear disengagement and the gear adjustment demand is a gear up demand, controlling the engine to stop fuel injection, and through controlling the opening or closing of the first electromagnetic valve and the second electromagnetic valve, the pneumatic actuator converts high-pressure gas in the high-pressure gas tank of the vehicle into negative torque required by the engine until the difference between the speed of the engine and a first preset speed is less than a first preset difference, then the first electromagnetic valve is closed and the second electromagnetic valve is opened, and the gear up demand of the vehicle is completed; when detecting that the AMT gearbox completes gear disengagement and the gear adjustment demand is a gear down demand, controlling the opening or closing of the first electromagnetic valve and the second electromagnetic valve, so that the pneumatic actuator converts high-pressure gas in the high-pressure gas tank of the vehicle into positive torque required by the engine until the difference between the speed of the engine and a second preset speed is less than a second preset difference, then the first electromagnetic valve is closed and the second electromagnetic valve is opened, and the gear down demand of the vehicle is completed.

2. The method of claim 1, wherein, The pneumatic actuator is composed of a crankshaft, a cylinder, a connecting rod and a piston; when detecting that the vehicle has a gear adjustment demand, sending a corresponding torque request to the engine, so that the engine controls its torque to drop to 0 based on the torque request, and the engine stops fuel injection; controlling the second electromagnetic valve to be closed, and controlling the opening or closing of the first electromagnetic valve according to the position of the piston in the cylinder in real time, so that the pneumatic actuator converts high-pressure gas in the high-pressure gas tank of the vehicle into negative torque required by the engine until the torque of the engine is less than a preset torque, then the first electromagnetic valve is closed and the second electromagnetic valve is opened, and the negative torque provided for the engine is stopped. ​ 3. The method of claim 2, wherein, The when it is detected that the AMT gearbox completes the gear shifting, and the gear adjustment requirement is the upshift requirement, the engine is controlled to stop fuel injection, and the opening or closing of the first electromagnetic valve and the second electromagnetic valve is controlled, so that the pneumatic actuator converts the high-pressure gas in the vehicle high-pressure gas storage tank into the negative torque required by the engine, until the difference between the engine speed and the first preset speed is less than the first preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened, the negative torque for the engine is stopped, and the upshift requirement of the vehicle is completed. When it is detected that the AMT gearbox completes the gear shifting, and the gear adjustment requirement is the upshift requirement, the corresponding torque request is sent to the engine again, so that the engine controls its torque to drop to 0 based on the torque request, and the engine is restarted to stop fuel injection. The second electromagnetic valve is controlled to be closed, and the opening or closing of the first electromagnetic valve is controlled in real time according to the position of the piston in the cylinder, so that the pneumatic actuator converts the high-pressure gas in the vehicle high-pressure gas storage tank into the negative torque required by the engine, until the difference between the engine speed and the first preset speed is less than the first preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened, the negative torque for the engine is stopped, and the upshift requirement of the vehicle is completed; wherein the first preset speed is the speed corresponding to the target upshift gear indicated by the upshift requirement.

4. The method of claim 3, wherein, The opening or closing of the first electromagnetic valve is controlled in real time according to the position of the piston in the cylinder, so that the pneumatic actuator converts the high-pressure gas in the vehicle high-pressure gas storage tank into the negative torque required by the engine, including: When it is detected that the piston reaches the piston top dead center in the cylinder, the first electromagnetic valve is opened, so that the high-pressure gas in the vehicle high-pressure gas storage tank is filled into the cylinder, and the piston starts to go up in the cylinder after reaching the piston top dead center, so as to compress the high-pressure gas in the cylinder back to the vehicle high-pressure gas storage tank, forming the negative torque required by the engine; When it is detected that the piston goes up to the piston bottom dead center in the cylinder, the first electromagnetic valve is closed, so that the gas in the cylinder is completely compressed to the vehicle high-pressure gas storage tank; wherein the piston starts to go down in the cylinder after reaching the piston bottom dead center, until it reaches the piston top dead center.

5. The method of claim 2, wherein, The when it is detected that the AMT gearbox completes the gear shifting, and the gear adjustment requirement is the upshift requirement, the engine is controlled to stop fuel injection, and the opening or closing of the first electromagnetic valve and the second electromagnetic valve is controlled, so that the pneumatic actuator converts the high-pressure gas in the vehicle high-pressure gas storage tank into the negative torque required by the engine, until the difference between the engine speed and the first preset speed is less than the first preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened, the negative torque for the engine is stopped, and the upshift requirement of the vehicle is completed. When it is detected that the AMT gearbox completes the gear shifting, and the gear adjustment demand is a downshift demand, the first electromagnetic valve and the second electromagnetic valve are controlled according to the position of the piston in the cylinder in real time, so that the pneumatic actuator converts the high-pressure gas in the high-pressure gas tank into the positive torque required by the engine, until the difference between the speed of the engine and the second preset speed is less than the second preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened, the positive torque provided for the engine is stopped, and the downshift demand of the vehicle is completed; wherein the second preset speed is the speed corresponding to the target downshift gear indicated by the downshift demand.

6. The method of claim 5, wherein, The first electromagnetic valve and the second electromagnetic valve are controlled according to the position of the piston in the cylinder in real time, so that the pneumatic actuator converts the high-pressure gas in the high-pressure gas tank into the positive torque required by the engine, including: When the piston reaches the lower top dead center in the cylinder, the first electromagnetic valve is opened and the second electromagnetic valve is closed, so that the high-pressure gas in the high-pressure gas tank is filled into the cylinder to provide positive torque for the engine; wherein the piston starts to descend in the cylinder after reaching the lower top dead center of the piston, until the piston reaches the upper bottom dead center in the cylinder; When it is detected that the piston reaches the upper bottom dead center, the first electromagnetic valve is closed and the second electromagnetic valve is opened, so that the gas in the cylinder is discharged from the second electromagnetic valve; the piston starts to ascend in the cylinder after reaching the upper bottom dead center of the piston, until reaching the lower top dead center of the piston.

7. A selection and shift assist system for a vehicle, characterized by The system comprises a controller, an AMT gearbox, an engine, a pneumatic actuator and a high-pressure gas tank of the vehicle, the pneumatic actuator is connected with the high-pressure gas tank through the first electromagnetic valve and the second electromagnetic valve; When the controller detects that the vehicle has a gear adjustment demand, the engine is controlled to stop injecting oil, and the first electromagnetic valve and the second electromagnetic valve are controlled to be opened or closed, so that the pneumatic actuator converts the high-pressure gas in the high-pressure gas tank into the negative torque required by the engine, until the torque of the engine is less than the preset torque, the first electromagnetic valve is closed and the second electromagnetic valve is opened; The controller sends a gear shifting instruction to the AMT gearbox, so that the AMT gearbox performs gear shifting based on the gear shifting instruction; When the controller detects that the AMT gearbox completes the gear shifting, and the gear adjustment demand is an upshift demand, the engine is controlled to stop injecting oil, and the first electromagnetic valve and the second electromagnetic valve are controlled to be opened or closed, so that the pneumatic actuator converts the high-pressure gas in the high-pressure gas tank into the negative torque required by the engine, until the difference between the speed of the engine and the first preset speed is less than the first preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened, and the upshift demand of the vehicle is completed; When the controller detects that the AMT gearbox completes the gear shifting and the gear adjustment requirement is the downshift requirement, the opening or closing of the first electromagnetic valve and the second electromagnetic valve is controlled, so that the pneumatic actuator converts the high-pressure gas in the high-pressure gas tank of the vehicle into the positive torque required by the engine until the difference between the engine speed and the second preset speed is less than the second preset difference, and the first electromagnetic valve is closed and the second electromagnetic valve is opened to complete the downshift requirement of the vehicle.

8. The system of claim 7, wherein, The pneumatic actuator comprises a crankshaft, a cylinder, a connecting rod and a piston; When the controller detects that the vehicle has a gear adjustment requirement, the engine is stopped from injecting oil, and the opening or closing of the first electromagnetic valve and the second electromagnetic valve is controlled, so that the pneumatic actuator converts the high-pressure gas in the high-pressure gas tank of the vehicle into the negative torque required by the engine until the torque of the engine is less than the preset torque, and the first electromagnetic valve is closed and the second electromagnetic valve is opened, specifically for: When the controller detects that the vehicle has a gear adjustment requirement, the corresponding torque request is sent to the engine, so that the engine controls its torque to drop to 0 based on the torque request, and the engine is stopped from injecting oil; the second electromagnetic valve is controlled to be closed, and the opening or closing of the first electromagnetic valve is controlled in real time according to the position of the piston in the cylinder, so that the pneumatic actuator converts the high-pressure gas in the high-pressure gas tank of the vehicle into the negative torque required by the engine until the torque of the engine is less than the preset torque, and the first electromagnetic valve is closed and the second electromagnetic valve is opened to stop providing negative torque to the engine; the pneumatic actuator at least comprises a piston and a cylinder.

9. The system of claim 8, wherein, When the controller detects that the AMT gearbox completes the gear shifting and the gear adjustment requirement is the upshift requirement, the engine is stopped from injecting oil, and the opening or closing of the first electromagnetic valve and the second electromagnetic valve is controlled, so that the pneumatic actuator converts the high-pressure gas in the high-pressure gas tank of the vehicle into the negative torque required by the engine until the difference between the engine speed and the first preset speed is less than the first preset difference, and the first electromagnetic valve is closed and the second electromagnetic valve is opened to complete the upshift requirement of the vehicle, specifically for: When it is detected that the AMT gearbox completes the gear shifting, and the gear adjustment requirement is a gear up requirement, the corresponding torque request is sent to the engine again, the engine is controlled to reduce its torque to 0 based on the torque request, the engine is restarted, the second electromagnetic valve is controlled to be closed, and the first electromagnetic valve is controlled to be opened or closed according to the position of the piston in the cylinder in real time, so that the pneumatic actuator converts the high-pressure gas in the high-pressure gas tank into the negative torque required by the engine, until the difference between the engine speed and the first preset speed is less than the first preset difference, the first electromagnetic valve is closed and the second electromagnetic valve is opened, the negative torque provided to the engine is stopped, and the gear up requirement of the vehicle is completed; wherein the first preset speed is the speed corresponding to the target gear up gear indicated by the gear up requirement.

10. The system of claim 9, wherein, The controller for controlling the first electromagnetic valve to be opened or closed according to the position of the piston in the cylinder in real time, so that the pneumatic actuator converts the high-pressure gas in the high-pressure gas tank into the negative torque required by the engine, is specifically used for: When it is detected that the piston reaches the piston top dead center in the cylinder, the first electromagnetic valve is opened, the high-pressure gas in the high-pressure gas tank is filled into the cylinder, and the piston starts to go up in the cylinder after reaching the piston top dead center, so as to compress the high-pressure gas in the cylinder back to the high-pressure gas tank, and form the negative torque required by the engine; when it is detected that the piston goes up to the piston bottom dead center in the cylinder, the first electromagnetic valve is closed, so that the gas in the cylinder is completely compressed to the high-pressure gas tank; wherein the piston starts to go down in the cylinder after reaching the piston bottom dead center, until it reaches the piston top dead center.

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