Vehicle performance control method, device, equipment and readable storage medium

Abstract

The present invention provides a vehicle performance control method, device, equipment and readable storage medium. The method comprises: when there is a communication failure in the automatic transmission, judging whether the vehicle is idling or driving normally according to the accelerator pedal opening, vehicle speed, engine speed, accelerator pedal torque and the torque of the idle speed controller; if the vehicle is idling, limiting the torque force of the vehicle to a first torque force; if the vehicle is driving normally, limiting the torque force of the vehicle to a second torque force, wherein the second torque force is greater than the first torque force. The present invention solves the problem in the prior art that the torque force of the vehicle cannot be reasonably limited when there is a communication failure in the automatic transmission.

Description

Technical Field

[0001] The present invention relates to the field of automatic control technology, and in particular to a vehicle performance control method, device, equipment and readable storage medium. Background Art

[0002] With the development of technology, automatic transmissions are widely used, and automatic transmissions mainly interact with the powertrain through the CAN bus. When the automatic transmission fails and cannot interact with the powertrain, the existing solution uses a method of directly limiting the vehicle's torque to ensure safe driving of the vehicle. However, if the torque limit on the vehicle is small, the torque limit at idle speed cannot be achieved; if the torque limit on the vehicle is large, the vehicle will stall due to insufficient torque when climbing a slope with a heavy load. Summary of the invention

[0003] The main purpose of the present invention is to provide a vehicle performance control method, device, equipment and readable storage medium, aiming to solve the problem in the prior art that when there is a communication failure in the automatic transmission, the torque of the vehicle cannot be reasonably limited.

[0004] In a first aspect, the present invention provides a vehicle performance control method, the vehicle performance control method comprising:

[0005] When there is a communication failure in the automatic transmission, the vehicle is judged to be idling or driving normally based on the accelerator pedal opening, vehicle speed, engine speed, accelerator pedal torque and the torque of the idle speed controller;

[0006] If the vehicle is idling, the torque force of the vehicle is limited to the first torque force;

[0007] If the vehicle is driving normally, the torque force limiting the vehicle is a second torque force, wherein the second torque force is greater than the first torque force.

[0008] Optionally, before the step of determining whether the vehicle is idling or driving normally according to the accelerator pedal opening, vehicle speed, engine speed, accelerator pedal torque, and torque of an idle speed controller when there is a communication failure in the automatic transmission, the following steps are included:

[0009] Establishing a heartbeat connection between the powertrain and the automatic transmission;

[0010] If the powertrain does not receive the heartbeat message sent by the automatic transmission within a preset time, it is determined that there is a communication failure in the automatic transmission.

[0011] Optionally, the step of judging whether the vehicle is idling or driving normally according to the accelerator pedal opening, vehicle speed, engine speed, accelerator pedal torque and torque of an idle speed controller includes:

[0012] Determining whether the vehicle meets the idle driving condition according to the accelerator pedal opening, vehicle speed, engine speed, accelerator pedal torque and the torque of the idle speed controller, wherein the idle driving condition is that the accelerator pedal opening is zero and the vehicle speed is less than a threshold value corresponding to the vehicle speed or the engine speed is less than a threshold value corresponding to the engine speed and the accelerator pedal torque is less than the torque of the idle speed controller;

[0013] If the idling condition is met, the judgment result is that the vehicle is idling;

[0014] If the idling condition is not met, the judgment result is that the vehicle is driving normally.

[0015] Optionally, the vehicle performance control method further includes:

[0016] Determine whether the vehicle meets the condition of having a flameout risk according to the engine speed or the vehicle speed, wherein the condition of having a flameout risk is that the engine speed is less than the lower limit of the engine speed corresponding to idling or the vehicle speed is less than the lower limit of the vehicle speed corresponding to idling;

[0017] If the conditions for the risk of flameout are met, the torque of the vehicle will not be limited until the risk of flameout is eliminated.

[0018] If the conditions for the risk of stalling are not met, it is determined whether the powertrain receives the heartbeat message sent by the automatic transmission within a preset time. If received, the vehicle's torque will not be restricted. If not, the vehicle's torque will continue to be restricted.

[0019] Optionally, the vehicle intelligent protection method further includes:

[0020] Determine whether the automatic transmission has a jamming fault based on the engine speed, vehicle speed, wheel rolling radius and rear axle speed ratio;

[0021] If there is a stuck fault, the accelerator pedal opening, vehicle speed, engine speed, accelerator pedal torque and idle controller torque are used to determine whether the vehicle is idling.

[0022] If the vehicle is idling, judging whether the vehicle meets the braking condition according to the brake pedal change rate and the brake pedal opening, wherein the braking condition is that the brake pedal change rate is greater than a first threshold value and the brake pedal opening is greater than a second threshold value, and the duration of the vehicle's brake pedal change rate being greater than the first threshold value and the brake pedal opening being greater than the second threshold value is greater than a third threshold value;

[0023] If the braking conditions are met, the engine is controlled to stop injecting fuel;

[0024] If the braking conditions are not met, the engine is controlled to inject fuel normally.

[0025] Optionally, the step of judging whether there is a stuck fault in the automatic transmission according to the engine speed, vehicle speed, wheel rolling radius and rear axle speed ratio includes:

[0026] The theoretical gear position of the vehicle is obtained according to the engine speed, vehicle speed, wheel rolling radius and rear axle speed ratio;

[0027] If the theoretical gear position of the vehicle is different from the actual gear position of the vehicle, it is judged that there is a jamming fault in the automatic transmission;

[0028] If the vehicle's theoretical gear position is the same as the vehicle's actual gear position, the judgment result is that there is no jamming fault in the automatic transmission.

[0029] Optionally, after the step of controlling the engine to stop fuel injection, the method further comprises:

[0030] Determine whether to control the engine fuel injection according to the throttle opening or whether the vehicle cruise mode is turned on;

[0031] If the throttle opening is not zero or the vehicle cruise mode is on, the engine is controlled to inject fuel normally;

[0032] If the throttle opening is zero or the vehicle cruise mode is not turned on, the engine fuel injection is not controlled.

[0033] In a second aspect, the present invention further provides a vehicle performance control device, the vehicle performance control device comprising:

[0034] A judgment module, used to judge whether the vehicle is idling or driving normally according to the accelerator pedal opening, vehicle speed, engine speed, accelerator pedal torque and torque of the idle speed controller when there is a communication failure in the automatic transmission;

[0035] A first limiting module, used for limiting the torque of the vehicle to a first torque if the vehicle is idling;

[0036] The second limiting module is used to limit the torque of the vehicle to a second torque if the vehicle is driving normally, wherein the second torque is greater than the first torque.

[0037] In a third aspect, the present invention also provides a vehicle performance control device, comprising a processor, a memory, and a vehicle performance control program stored in the memory and executable by the processor, wherein when the vehicle performance control program is executed by the processor, the steps of the vehicle performance control method as described above are implemented.

[0038] In a fourth aspect, the present invention further provides a readable storage medium, on which a vehicle performance control program is stored, wherein when the vehicle performance control program is executed by a processor, the steps of the vehicle performance control method as described above are implemented.

[0039] In the present invention, when there is a communication failure in the automatic transmission, it is determined whether the vehicle is idling or driving normally according to the accelerator pedal opening, vehicle speed, engine speed, accelerator pedal torque and the torque of the idle controller; if the vehicle is idling, the torque force of the vehicle is limited to the first torque force; if the vehicle is driving normally, the torque force of the vehicle is limited to the second torque force, wherein the second torque force is greater than the first torque force. Through the present invention, when there is a communication failure in the automatic transmission, it is first determined whether the vehicle is idling or driving normally. If the vehicle is idling, the torque force of the vehicle is limited to the first torque force, thereby avoiding a small restriction on the torque force of the vehicle and insufficient restriction on the torque force of idling. If the vehicle is driving normally, the torque force of the vehicle is limited to the second torque force, thereby avoiding a large restriction on the torque force of the vehicle, resulting in the vehicle stalling due to insufficient torque force when climbing a slope with a heavy load, thereby solving the problem in the prior art that the torque force of the vehicle cannot be reasonably restricted when there is a communication failure in the automatic transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of the hardware structure of a vehicle performance control device involved in an embodiment of the present invention;

[0041] Figure 2 A schematic flow chart of a first embodiment of a vehicle performance control method of the present invention;

[0042] Figure 3 A schematic flow chart of a second embodiment of a vehicle performance control method according to the present invention;

[0043] Figure 4 A schematic flow chart of a third embodiment of a vehicle performance control method according to the present invention;

[0044] Figure 5 It is a schematic diagram of the functional modules of an embodiment of a vehicle performance control device of the present invention.

[0045] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0046] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0047] In a first aspect, an embodiment of the present invention provides a vehicle performance control device, which may be a device having a data processing function, such as a personal computer (PC), a notebook computer, or a server.

[0048] Reference Figure 1 , Figure 1It is a schematic diagram of the hardware structure of the vehicle performance control device involved in the embodiment of the present invention. In the embodiment of the present invention, the vehicle performance control device may include a processor 1001 (such as a central processing unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components; the user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard); the network interface 1004 may optionally include a standard wired interface, a wireless interface (such as a wireless fidelity WIreless-FIdelity, WI-FI interface); the memory 1005 may be a high-speed random access memory (random access memory, RAM), or a stable memory (non-volatile memory), such as a disk storage, and the memory 1005 may optionally be a storage device independent of the aforementioned processor 1001. Those skilled in the art will understand that Figure 1 The hardware structure shown in the figure does not constitute a limitation of the present invention, and may include more or less components than those shown in the figure, or combine certain components, or arrange the components differently.

[0049] Continue to refer to Figure 1 , Figure 1 The memory 1005 as a computer storage medium may include an operating system, a network communication module, a user interface module, and a vehicle performance control program. The processor 1001 may call the vehicle performance control program stored in the memory 1005 and execute the vehicle performance control method provided in the embodiment of the present invention.

[0050] In a second aspect, an embodiment of the present invention provides a vehicle performance control method.

[0051] In one embodiment, referring to Figure 2 , Figure 2 FIG. 1 is a flow chart of the first embodiment of the vehicle performance control method of the present invention. Figure 2 As shown, the vehicle performance control method includes:

[0052] Step S10, when there is a communication failure in the automatic transmission, judging whether the vehicle is idling or driving normally according to the accelerator pedal opening, vehicle speed, engine speed, accelerator pedal torque and torque of the idle speed controller;

[0053] In this embodiment, when there is a communication failure in the automatic transmission at time t, it is determined whether the vehicle is idling or driving normally based on the accelerator pedal opening, vehicle speed, engine speed, accelerator pedal torque and torque of the idle controller of the vehicle at time t, so as to take corresponding measures to limit the vehicle torque according to the driving status of the vehicle.

[0054] Step S20, if the vehicle is idling, limiting the torque of the vehicle to a first torque;

[0055] In this embodiment, taking the first torque force as 9% of the maximum torque force of the vehicle as an example, if the vehicle is idling, the torque force of the vehicle is limited to 9% of the maximum torque force of the vehicle. Because the torque force required when the vehicle is idling is small, when the judgment result is that the vehicle is idling, the torque force of the vehicle is limited to 9% of the maximum torque force of the vehicle, that is, the torque force of the vehicle is limited to a large extent, thereby avoiding the problem that the torque force of the vehicle is limited to a small extent and the torque force of idling is not limited.

[0056] Step S30: if the vehicle is driving normally, the torque force of the vehicle is limited to a second torque force, wherein the second torque force is greater than the first torque force.

[0057] In this embodiment, taking the second torque force as 60% of the maximum torque force of the vehicle as an example, if the vehicle is driving normally, the torque force of the vehicle is limited to 60% of the maximum torque force of the vehicle. Because the torque force required for normal driving of the vehicle is greater than the torque force required for idling, when the judgment result is that the vehicle is driving normally, the degree of restriction on the vehicle torque force is less than the degree of restriction on the vehicle torque force when the vehicle is idling, that is, the second torque force when the vehicle is driving normally is greater than the first torque force when the vehicle is idling. Therefore, when the judgment result is that the vehicle is driving normally, the torque force of the vehicle is limited to 60% of the maximum torque force of the vehicle, that is, the torque force of the vehicle is limited less, thereby avoiding the problem of large restriction on the torque force of the vehicle, which leads to the problem of the vehicle stalling due to insufficient torque force when climbing a slope with heavy load. It is easy to think that when the vehicle is climbing a slope with heavy load, the vehicle is in a normal driving state.

[0058] In this embodiment, when there is a communication failure in the automatic transmission, the vehicle is judged to be idling or driving normally according to the accelerator pedal opening, vehicle speed, engine speed, accelerator pedal torque and the torque of the idle controller; if the vehicle is idling, the torque force of the vehicle is limited to the first torque force; if the vehicle is driving normally, the torque force of the vehicle is limited to the second torque force, wherein the second torque force is greater than the first torque force. Through this embodiment, when there is a communication failure in the automatic transmission, it is first judged whether the vehicle is idling or driving normally. If the vehicle is idling, the torque force of the vehicle is limited to the first torque force, so as to avoid the torque force of the vehicle being limited too small and the torque force of idling driving not being limited; if the vehicle is driving normally, the torque force of the vehicle is limited to the second torque force, so as to avoid the torque force of the vehicle being limited too large, resulting in the vehicle stalling due to insufficient torque force when climbing a slope with heavy load, thus solving the problem that the torque force of the vehicle cannot be reasonably limited when there is a communication failure in the automatic transmission in the prior art.

[0059] Furthermore, in one embodiment, before step S10, the following steps are included:

[0060] Establishes a heartbeat connection between the powertrain and the automatic transmission;

[0061] If the powertrain does not receive the heartbeat message sent by the automatic transmission within a preset time, it is determined that there is a communication failure in the automatic transmission.

[0062] In this embodiment, during normal driving of the vehicle, the message of the automatic transmission is obtained, and a heartbeat connection is established between the powertrain and the automatic transmission. If the powertrain does not receive the heartbeat message sent by the automatic transmission within a preset time, it means that the heartbeat has timed out, and it is determined that there is a communication failure in the automatic transmission. If the powertrain receives the heartbeat message sent by the automatic transmission within the preset time, it is determined that there is no communication failure in the automatic transmission.

[0063] Furthermore, in one embodiment, the step of judging whether the vehicle is idling or driving normally according to the accelerator pedal opening, vehicle speed, engine speed, accelerator pedal torque, and torque of the idle speed controller includes:

[0064] Determining whether the vehicle meets the idle driving condition according to the accelerator pedal opening, vehicle speed, engine speed, accelerator pedal torque and the torque of the idle speed controller, wherein the idle driving condition is that the accelerator pedal opening is zero and the vehicle speed is less than a threshold value corresponding to the vehicle speed or the engine speed is less than a threshold value corresponding to the engine speed and the accelerator pedal torque is less than the torque of the idle speed controller;

[0065] If the idling condition is met, the judgment result is that the vehicle is idling;

[0066] If the idling condition is not met, the judgment result is that the vehicle is driving normally.

[0067] In this embodiment, when the vehicle's accelerator pedal opening is zero and the vehicle speed is less than the threshold corresponding to the vehicle speed or the engine speed is less than the threshold corresponding to the engine speed and the accelerator pedal torque is less than the torque of the idle controller, the judgment result is that the vehicle is idling.

[0068] When the vehicle's accelerator pedal opening is greater than zero or the vehicle speed is greater than or equal to the threshold corresponding to the vehicle speed and / or the engine speed is greater than or equal to the threshold corresponding to the engine speed and / or the accelerator pedal torque is greater than or equal to the torque of the idle controller, the judgment result is that the vehicle is driving normally.

[0069] Further, in one embodiment, referring to Figure 3 , Figure 3 FIG. 2 is a flow chart of the second embodiment of the vehicle performance control method of the present invention. Figure 3 As shown, the vehicle performance control method further includes:

[0070] Step S40, judging whether the vehicle meets the condition of having a flameout risk according to the engine speed or the vehicle speed, wherein the condition of having a flameout risk is that the engine speed is less than the lower limit of the engine speed corresponding to idling or the vehicle speed is less than the lower limit of the vehicle speed corresponding to idling;

[0071] Step S50: if the condition of flameout risk is met, the torque of the vehicle is not limited until the flameout risk is no longer present;

[0072] Step S60, if the condition of the risk of flameout is not met, it is determined whether the powertrain receives the heartbeat message sent by the automatic transmission within a preset time. If received, the torque of the vehicle is not limited. If not received, the torque of the vehicle continues to be limited.

[0073] In this embodiment, during the process of limiting the torque force of the vehicle, it is determined whether the vehicle meets the risk of stalling based on the engine speed or the vehicle speed.

[0074] When the engine speed is less than the lower limit of the engine speed corresponding to idling or the vehicle speed is less than the lower limit of the vehicle speed corresponding to idling, the judgment result is that the vehicle is at risk of stalling. When the vehicle is at risk of stalling, the torque force of the vehicle is no longer restricted until the vehicle is no longer at risk of stalling, and the restriction on the torque force of the vehicle is restored. It is easy to think that if the vehicle is judged to be at risk of stalling during the process of limiting the torque force of the vehicle to the first torque force, the torque force of the vehicle is no longer restricted until the vehicle is no longer at risk of stalling, and the restriction on the torque force of the vehicle is restored, that is, the torque force of the vehicle is restricted to the first torque force again; if the vehicle is judged to be at risk of stalling during the process of limiting the torque force of the vehicle to the second torque force, the torque force of the vehicle is no longer restricted until the vehicle is no longer at risk of stalling, and the restriction on the torque force of the vehicle is restored, that is, the torque force of the vehicle is restricted to the second torque force again.

[0075] When the engine speed is greater than or equal to the lower limit of the engine speed corresponding to idling and / or the vehicle speed is greater than or equal to the lower limit of the vehicle speed corresponding to idling, the judgment result is that the vehicle has no risk of stalling, and then it is judged again whether the powertrain receives the heartbeat message sent by the automatic transmission within the preset time. If the powertrain receives the heartbeat message sent by the automatic transmission within the preset time, it means that the automatic transmission does not have a communication failure at this time, and then the limitation of the vehicle torque force is stopped. If the powertrain does not receive the heartbeat message sent by the automatic transmission within the preset time, it means that the automatic transmission still has a communication failure, and then the vehicle torque force continues to be limited. It is easy to think that if the vehicle's torque force is limited to the first torque force, the judgment result is that the vehicle has no risk of stalling and the automatic transmission still has a communication failure, then the vehicle's torque force continues to be limited to the first torque force; if the vehicle's torque force is limited to the second torque force, the judgment result is that the vehicle has no risk of stalling and the automatic transmission still has a communication failure, then the vehicle's torque force continues to be limited to the second torque force. It should be noted that step S40 is executed after step S20 or after step S30.

[0076] Further, in one embodiment, if Figure 4 As shown, the vehicle intelligent protection method also includes:

[0077] Step S110, judging whether there is a blocking fault in the automatic transmission according to the engine speed, vehicle speed, wheel rolling radius and rear axle speed ratio;

[0078] Step S120, if there is a stuck fault, judging whether the vehicle is idling according to the accelerator pedal opening, vehicle speed, engine speed, accelerator pedal torque and torque of the idle speed controller;

[0079] Step S130, if the vehicle is idling, judging whether the vehicle meets the braking condition according to the brake pedal change rate and the brake pedal opening, wherein the braking condition is that the brake pedal change rate is greater than a first threshold and the brake pedal opening is greater than a second threshold and the duration of the vehicle's brake pedal change rate being greater than the first threshold and the brake pedal opening being greater than the second threshold is greater than a third threshold;

[0080] Step S140, if the braking condition is met, the engine is controlled to stop injecting fuel;

[0081] Step S150: If the braking condition is not met, the engine is controlled to inject fuel normally.

[0082] In this embodiment, during normal driving of the vehicle, the vehicle's engine speed, vehicle speed, wheel rolling radius and rear axle speed ratio are obtained, and it is determined whether the automatic transmission has a jamming fault based on the engine speed, vehicle speed, wheel rolling radius and rear axle speed ratio.

[0083] If it is determined at time t1 that the automatic transmission has a stuck fault, it is determined whether the vehicle is idling based on the accelerator pedal opening, vehicle speed, engine speed, accelerator pedal torque and idle controller torque of the vehicle at time t1.

[0084] If the judgment result is that the vehicle is driving normally, no processing is performed. If the judgment result is that the vehicle is idling, whether the vehicle meets the braking condition is determined based on the brake pedal change rate and brake pedal opening of the vehicle during idling.

[0085] If the vehicle's brake pedal change rate is greater than a first threshold and the brake pedal opening is greater than a second threshold and the duration of the vehicle's brake pedal change rate being greater than the first threshold and the brake pedal opening being greater than the second threshold is greater than a third threshold, it indicates that the driver intends to brake urgently. At this time, the judgment result is that the vehicle meets the braking conditions, and the engine is controlled to stop fuel injection to avoid the vehicle being difficult to stop.

[0086] If the vehicle's brake pedal change rate is less than or equal to the first threshold and / or the brake pedal opening is less than or equal to the second threshold and / or the vehicle's brake pedal change rate is greater than the first threshold and the duration of the brake pedal opening greater than the second threshold is less than or equal to the third threshold, it indicates that the driver has no intention of emergency braking. At this time, the judgment result is that the vehicle does not meet the braking conditions, and the engine is controlled to spray fuel normally, that is, the engine is not controlled to stop spraying fuel.

[0087] Further, in one embodiment, the step of determining whether there is a stuck fault in the automatic transmission according to the engine speed, vehicle speed, wheel rolling radius and rear axle speed ratio includes:

[0088] The theoretical gear position of the vehicle is obtained according to the engine speed, vehicle speed, wheel rolling radius and rear axle speed ratio;

[0089] If the theoretical gear position of the vehicle is different from the actual gear position of the vehicle, it is judged that there is a jamming fault in the automatic transmission;

[0090] If the vehicle's theoretical gear position is the same as the vehicle's actual gear position, the judgment result is that there is no jamming fault in the automatic transmission.

[0091] In this embodiment, the engine speed, vehicle speed, wheel rolling radius and rear axle speed ratio are substituted into the formula: The vehicle's gearbox speed ratio is calculated, and the vehicle's theoretical gear is determined by looking up the gearbox speed ratio table based on the gearbox speed ratio. gear Indicates the gearbox ratio, V 1 Indicates the engine speed, i axle represents the rear axle speed ratio, r represents the wheel rolling radius, V 2 Indicates vehicle speed.

[0092] After determining the theoretical gear position of the vehicle, compare the theoretical gear position of the vehicle with the actual gear position. If the theoretical gear position of the vehicle is different from the actual gear position of the vehicle, the judgment result is that there is a jamming fault in the automatic transmission. If the theoretical gear position of the vehicle is the same as the actual gear position of the vehicle, the judgment result is that there is no jamming fault in the automatic transmission.

[0093] Or, the upper and lower limits of the engine speed corresponding to the theoretical gear of the vehicle are compared with the actual engine speed of the vehicle. If the actual engine speed of the vehicle is greater than the upper limit of the engine speed corresponding to the theoretical gear of the vehicle, it means that the vehicle should upshift but did not upshift, and the judgment result is that there is a jamming fault in the automatic transmission. If the actual engine speed of the vehicle is less than the lower limit of the engine speed corresponding to the theoretical gear of the vehicle, it means that the vehicle should downshift but did not downshift, and the judgment result is that there is a jamming fault in the automatic transmission. If the actual engine speed of the vehicle is less than or equal to the upper limit of the engine speed corresponding to the theoretical gear of the vehicle and greater than or equal to the lower limit of the engine speed corresponding to the theoretical gear of the vehicle, the judgment result is that there is no jamming fault in the automatic transmission.

[0094] Or, the upper and lower speed limits corresponding to the theoretical gear position of the vehicle are compared with the actual speed of the vehicle. If the actual speed of the vehicle is greater than the upper speed limit corresponding to the theoretical gear position of the vehicle, it means that the vehicle should upshift but did not upshift, and the judgment result is that there is a jamming fault in the automatic transmission. If the actual speed of the vehicle is less than the lower speed limit corresponding to the theoretical gear position of the vehicle, it means that the vehicle should downshift but did not downshift, and the judgment result is that there is a jamming fault in the automatic transmission. If the actual speed of the vehicle is less than or equal to the upper speed limit corresponding to the theoretical gear position of the vehicle and greater than or equal to the lower speed limit corresponding to the theoretical gear position of the vehicle, the judgment result is that there is no jamming fault in the automatic transmission.

[0095] Furthermore, in one embodiment, after the step of controlling the engine to stop fuel injection, the following steps are included:

[0096] Determine whether to control the engine fuel injection according to the throttle opening or whether the vehicle cruise mode is turned on;

[0097] If the throttle opening is not zero or the vehicle cruise mode is on, the engine is controlled to inject fuel normally;

[0098] If the throttle opening is zero or the vehicle cruise mode is not turned on, the engine fuel injection is not controlled.

[0099] In this embodiment, whether to control the engine to inject fuel is determined based on the throttle opening of the vehicle after the engine stops injecting fuel or whether the vehicle cruise mode is turned on.

[0100] If the throttle opening is not zero or the vehicle cruise mode is on, it means that the driver has the intention to drive, and the judgment result is to control the engine to inject fuel normally to restore the driver's control over the vehicle.

[0101] If the throttle opening is zero or the vehicle cruise mode is off, that is, the vehicle cruise mode is not turned on, it means that the driver has no intention to drive, and the judgment result is not to control the engine fuel injection, that is, continue to control the engine to stop fuel injection.

[0102] In a third aspect, an embodiment of the present invention further provides a vehicle performance control device.

[0103] In one embodiment, referring to Figure 5 , Figure 5 FIG. 1 is a functional module diagram of an embodiment of a vehicle performance control device of the present invention. Figure 5 As shown, the vehicle performance control device includes:

[0104] The judging module 10 is used to judge whether the vehicle is idling or driving normally according to the accelerator pedal opening, vehicle speed, engine speed, accelerator pedal torque and torque of the idle speed controller when there is a communication failure in the automatic transmission;

[0105] A first limiting module 20, configured to limit the torque of the vehicle to a first torque if the vehicle is idling;

[0106] The second limiting module 30 is used for limiting the torque of the vehicle to a second torque if the vehicle is driving normally, wherein the second torque is greater than the first torque.

[0107] Furthermore, in one embodiment, the vehicle performance control device further includes a determination module, which is used to:

[0108] Any message of the automatic transmission is used as the heartbeat message;

[0109] Establishes a heartbeat connection between the powertrain and the automatic transmission;

[0110] If the powertrain does not receive the heartbeat message sent by the automatic transmission within a preset time, it is determined that there is a communication failure in the automatic transmission.

[0111] Furthermore, in one embodiment, the determination module 10 is further configured to:

[0112] Determining whether the vehicle meets the idle driving condition according to the accelerator pedal opening, vehicle speed, engine speed, accelerator pedal torque and the torque of the idle speed controller, wherein the idle driving condition is that the accelerator pedal opening is zero and the vehicle speed is less than a threshold value corresponding to the vehicle speed or the engine speed is less than a threshold value corresponding to the engine speed and the accelerator pedal torque is less than the torque of the idle speed controller;

[0113] If the idling condition is met, the judgment result is that the vehicle is idling;

[0114] If the idling condition is not met, the judgment result is that the vehicle is driving normally.

[0115] Furthermore, in one embodiment, the determination module 10 is further configured to:

[0116] Determine whether the vehicle meets the condition of having a flameout risk according to the engine speed or the vehicle speed, wherein the condition of having a flameout risk is that the engine speed is less than the lower limit of the engine speed corresponding to idling or the vehicle speed is less than the lower limit of the vehicle speed corresponding to idling;

[0117] If the conditions for the risk of flameout are met, the torque of the vehicle will not be limited until the risk of flameout is eliminated.

[0118] If the conditions for the risk of stalling are not met, it is determined whether the powertrain receives the heartbeat message sent by the automatic transmission within a preset time. If received, the vehicle's torque will not be restricted. If not, the vehicle's torque will continue to be restricted.

[0119] Furthermore, in one embodiment, the determination module 10 is further configured to:

[0120] Determine whether the automatic transmission has a jamming fault based on the engine speed, vehicle speed, wheel rolling radius and rear axle speed ratio;

[0121] If there is a stuck fault, the accelerator pedal opening, vehicle speed, engine speed, accelerator pedal torque and idle controller torque are used to determine whether the vehicle is idling.

[0122] If the vehicle is idling, judging whether the vehicle meets the braking condition according to the brake pedal change rate and the brake pedal opening, wherein the braking condition is that the brake pedal change rate is greater than a first threshold value and the brake pedal opening is greater than a second threshold value, and the duration of the vehicle's brake pedal change rate being greater than the first threshold value and the brake pedal opening being greater than the second threshold value is greater than a third threshold value;

[0123] If the braking conditions are met, the engine is controlled to stop injecting fuel;

[0124] If the braking conditions are not met, the engine is controlled to inject fuel normally.

[0125] Furthermore, in one embodiment, the determination module 10 is further configured to:

[0126] The theoretical gear position of the vehicle is obtained according to the engine speed, vehicle speed, wheel rolling radius and rear axle speed ratio;

[0127] If the theoretical gear position of the vehicle is different from the actual gear position of the vehicle, it is judged that there is a jamming fault in the automatic transmission;

[0128] If the vehicle's theoretical gear position is the same as the vehicle's actual gear position, the judgment result is that there is no jamming fault in the automatic transmission.

[0129] Furthermore, in one embodiment, the determination module 10 is further configured to:

[0130] Determine whether to control the engine fuel injection according to the throttle opening or whether the vehicle cruise mode is turned on;

[0131] If the throttle opening is not zero or the vehicle cruise mode is on, the engine is controlled to inject fuel normally;

[0132] If the throttle opening is zero or the vehicle cruise mode is not turned on, the engine fuel injection is not controlled.

[0133] Among them, the functional implementation of each module in the above-mentioned vehicle performance control device corresponds to the various steps in the above-mentioned vehicle performance control method embodiment, and its functions and implementation processes will not be repeated here one by one.

[0134] In a fourth aspect, an embodiment of the present invention further provides a readable storage medium.

[0135] The vehicle performance control program is stored on the readable storage medium of the present invention, wherein when the vehicle performance control program is executed by the processor, the steps of the vehicle performance control method as described above are implemented.

[0136] Among them, the method implemented when the vehicle performance control program is executed can refer to the various embodiments of the vehicle performance control method of the present invention, and will not be repeated here.

[0137] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0138] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0139] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for a terminal device to execute the methods described in each embodiment of the present invention.

[0140] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A vehicle performance control method, characterized in that: The vehicle performance control method comprises: When there is a communication failure in the automatic transmission, the vehicle is judged to be idling or driving normally based on the accelerator pedal opening, vehicle speed, engine speed, accelerator pedal torque and the torque of the idle speed controller; If the vehicle is idling, the torque force of the vehicle is limited to the first torque force; If the vehicle is driving normally, the torque force of the vehicle is limited to a second torque force, wherein the second torque force is greater than the first torque force; The vehicle performance control method further includes: Determine whether the automatic transmission has a jamming fault based on the engine speed, vehicle speed, wheel rolling radius and rear axle speed ratio; If there is a stuck fault, the accelerator pedal opening, vehicle speed, engine speed, accelerator pedal torque and idle controller torque are used to determine whether the vehicle is idling. If the vehicle is idling, judging whether the vehicle meets the braking condition according to the brake pedal change rate and the brake pedal opening, wherein the braking condition is that the brake pedal change rate is greater than a first threshold value and the brake pedal opening is greater than a second threshold value, and the duration of the vehicle's brake pedal change rate being greater than the first threshold value and the brake pedal opening being greater than the second threshold value is greater than a third threshold value; If the braking conditions are met, the engine is controlled to stop injecting fuel; If the braking conditions are not met, the engine is controlled to inject fuel normally.

2. The vehicle performance control method according to claim 1, characterized in that: Before the step of determining whether the vehicle is idling or driving normally according to the accelerator pedal opening, vehicle speed, engine speed, accelerator pedal torque and torque of the idle speed controller when there is a communication failure in the automatic transmission, the method includes: Establishing a heartbeat connection between the powertrain and the automatic transmission; If the powertrain does not receive the heartbeat message sent by the automatic transmission within a preset time, it is determined that there is a communication failure in the automatic transmission.

3. The vehicle performance control method according to claim 1, characterized in that: The step of judging whether the vehicle is idling or driving normally according to the accelerator pedal opening, vehicle speed, engine speed, accelerator pedal torque and the torque of the idle speed controller comprises: Determining whether the vehicle meets the idle driving condition according to the accelerator pedal opening, vehicle speed, engine speed, accelerator pedal torque and the torque of the idle speed controller, wherein the idle driving condition is that the accelerator pedal opening is zero and the vehicle speed is less than a threshold value corresponding to the vehicle speed or the engine speed is less than a threshold value corresponding to the engine speed and the accelerator pedal torque is less than the torque of the idle speed controller; If the idling condition is met, the judgment result is that the vehicle is idling; If the idling condition is not met, the judgment result is that the vehicle is driving normally.

4. The vehicle performance control method according to claim 1, characterized in that: The vehicle performance control method further includes: Determine whether the vehicle meets the condition of having a flameout risk according to the engine speed or the vehicle speed, wherein the condition of having a flameout risk is that the engine speed is less than the lower limit of the engine speed corresponding to idling or the vehicle speed is less than the lower limit of the vehicle speed corresponding to idling; If the conditions for the risk of flameout are met, the torque of the vehicle will not be limited until the risk of flameout is eliminated. If the conditions for the risk of stalling are not met, it is determined whether the powertrain receives the heartbeat message sent by the automatic transmission within a preset time. If received, the vehicle's torque will not be restricted. If not, the vehicle's torque will continue to be restricted.

5. The vehicle performance control method according to claim 1, characterized in that: The step of judging whether there is a stuck fault in the automatic transmission according to the engine speed, vehicle speed, wheel rolling radius and rear axle speed ratio comprises: The theoretical gear position of the vehicle is obtained according to the engine speed, vehicle speed, wheel rolling radius and rear axle speed ratio; If the theoretical gear position of the vehicle is different from the actual gear position of the vehicle, it is judged that there is a jamming fault in the automatic transmission; If the vehicle's theoretical gear position is the same as the vehicle's actual gear position, the judgment result is that there is no jamming fault in the automatic transmission.

6. The vehicle performance control method according to claim 1, characterized in that: After the step of controlling the engine to stop fuel injection, the method further comprises: Determine whether to control the engine fuel injection according to the throttle opening or whether the vehicle cruise mode is turned on; If the throttle opening is not zero or the vehicle cruise mode is on, the engine is controlled to inject fuel normally; If the throttle opening is zero or the vehicle cruise mode is not turned on, the engine fuel injection is not controlled.

7. A vehicle performance control device, characterized in that: The vehicle performance control device comprises: A judgment module, used to judge whether the vehicle is idling or driving normally according to the accelerator pedal opening, vehicle speed, engine speed, accelerator pedal torque and torque of the idle speed controller when there is a communication failure in the automatic transmission; A first limiting module, used for limiting the torque of the vehicle to a first torque if the vehicle is idling; A second limiting module, used for limiting the torque force of the vehicle to a second torque force if the vehicle is driving normally, wherein the second torque force is greater than the first torque force; The vehicle performance control device further comprises: Determine whether the automatic transmission has a jamming fault based on the engine speed, vehicle speed, wheel rolling radius and rear axle speed ratio; If there is a stuck fault, the accelerator pedal opening, vehicle speed, engine speed, accelerator pedal torque and idle controller torque are used to determine whether the vehicle is idling. If the vehicle is idling, judging whether the vehicle meets the braking condition according to the brake pedal change rate and the brake pedal opening, wherein the braking condition is that the brake pedal change rate is greater than a first threshold value and the brake pedal opening is greater than a second threshold value, and the duration of the vehicle's brake pedal change rate being greater than the first threshold value and the brake pedal opening being greater than the second threshold value is greater than a third threshold value; If the braking conditions are met, the engine is controlled to stop injecting fuel; If the braking conditions are not met, the engine is controlled to inject fuel normally.

8. A vehicle performance control device, characterized in that: The vehicle performance control device includes a processor, a memory, and a vehicle performance control program stored in the memory and executable by the processor, wherein when the vehicle performance control program is executed by the processor, the steps of the vehicle performance control method as described in any one of claims 1 to 6 are implemented.

9. A readable storage medium, characterized in that: The readable storage medium stores a vehicle performance control program, wherein when the vehicle performance control program is executed by a processor, the steps of the vehicle performance control method according to any one of claims 1 to 6 are implemented.

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