CN116771817A

CN116771817A - Control method, device and equipment for gearbox and storage medium

Info

Publication number: CN116771817A
Application number: CN202311072685.6A
Authority: CN
Inventors: 郭太民; 刘强; 宗伟; 曹永�; 田诚; 韩富强; 王超; 李永泉
Original assignee: Shengrui Transmission Co Ltd
Current assignee: Shengrui Transmission Co Ltd
Priority date: 2023-08-24
Filing date: 2023-08-24
Publication date: 2023-09-19

Abstract

The utility model relates to a control method, device, equipment and storage medium of gearbox, this disclosure carries out the slip control through the nimble first clutch that is in safe state of selecting according to the state of at least two clutches of gearbox, in time switches the second clutch that is in safe state when first clutch is in overheated state and carries out the slip control, has improved the life of at least two clutches, has prolonged the live time of gearbox under the slip control operating mode, under the prerequisite that does not increase the cost of gearbox, has improved the security and the market competition of gearbox.

Description

Control method, device and equipment for gearbox and storage medium

Technical Field

The disclosure relates to the technical field of gearboxes, and in particular relates to a control method, a device, equipment and a storage medium of a gearbox.

Background

The hybrid vehicle driving mode comprises a pure electric mode, a hybrid mode and a pure engine mode, when the hybrid vehicle is driven to run at a low speed by using the hybrid mode or the pure engine mode, the ratio of the rotating speed of an input shaft to the rotating speed of an output shaft of the gearbox is larger than a first gear transmission ratio, and under the working condition, one clutch in the gearbox is required to be controlled to be in a sliding friction state in order to prevent the engine from flameout, so that the heat generated when the clutch outputs power in the sliding friction state is in direct proportion to the torque transmitted by the clutch.

In the prior art, under the low-speed running condition of the hybrid vehicle, one clutch of the gearbox is controlled to enter a sliding friction state, and the gearbox cooling system cools the clutch, but when the heat generated by the clutch is larger than a safety value due to the limitation of the cooling capacity of the gearbox cooling system, the friction plate of the clutch is damaged, the performance of the friction plate is reduced, the service life of the clutch is shortened, and when the clutch is damaged, even if other clutches of the gearbox are intact, the functions of the gearbox are also invalid. Gearbox manufacturers employ methods to increase the cooling capacity of the gearbox cooling system and increase the number of friction plate packs to enhance the low speed drive capacity of the gearbox and to protect clutch safety, but such methods are too costly.

Therefore, there is a need for a control method of a transmission to solve the above problems.

Disclosure of Invention

In order to solve the technical problems or at least partially solve the technical problems, the present disclosure provides a control method, a device, equipment and a storage medium for a gearbox, so as to flexibly select a clutch in a safe state according to states of a plurality of clutches to perform sliding friction control, prolong the service time of the gearbox under a sliding friction control working condition, and improve the safety and market competitiveness of the gearbox on the premise of not increasing the cost of the gearbox.

In a first aspect, an embodiment of the present disclosure provides a control method of a gearbox, including:

when the gearbox enters sliding friction control, judging whether a first clutch is in a safe state, wherein the first clutch is any clutch of the gearbox;

when the first clutch is in a safe state, controlling the first clutch to perform sliding friction control, and controlling other clutches except the first clutch to be locked;

when the state of the first clutch is changed to the overheat state, judging whether a second clutch is in a safe state, wherein the second clutch is any clutch except the first clutch of the gearbox;

and when the second clutch is in a safe state, controlling the second clutch to perform sliding friction control, and controlling other clutches except the second clutch to be locked.

In a second aspect, an embodiment of the present disclosure provides a control device for a transmission, including:

the first judging module is used for judging whether the first clutch is in a safe state or not when the gearbox enters sliding friction control, and the first clutch is any clutch of the gearbox;

the first control module is used for controlling the first clutch to carry out sliding friction control and controlling other clutches except the first clutch to be locked when the first clutch is in a safe state;

The second judging module is used for judging whether a second clutch is in a safe state or not when the state of the first clutch is changed into an overheat state, wherein the second clutch is any clutch except the first clutch of the gearbox;

and the second control module is used for controlling the second clutch to carry out sliding friction control and controlling other clutches except the second clutch to be locked when the second clutch is in a safe state.

In a third aspect, an embodiment of the present disclosure provides an electronic device, including:

a memory;

a processor; and

a computer program;

wherein the computer program is stored in the memory and configured to be executed by the processor to implement the method according to the first aspect.

In a fourth aspect, embodiments of the present disclosure provide a computer-readable storage medium having stored thereon a computer program for execution by a processor to implement the method of the first aspect.

In a fifth aspect, embodiments of the present disclosure also provide a computer program product comprising a computer program or instructions which, when executed by a processor, implement the method of the first aspect.

According to the control method, the device, the equipment and the storage medium of the gearbox, the first clutch in the safe state is flexibly selected to carry out sliding friction control according to the states of the at least two clutches of the gearbox, and the second clutch in the safe state is timely switched to carry out sliding friction control when the first clutch is in the overheat state, so that the service lives of the at least two clutches are prolonged, the service time of the gearbox under the sliding friction control working condition is prolonged, and the safety and the market competitiveness of the gearbox are improved on the premise that the cost of the gearbox is not increased.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments of the present disclosure or the solutions in the prior art, the drawings that are required for the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.

FIG. 1 is a flow chart of a control method of a gearbox provided by an embodiment of the present disclosure;

FIG. 2 is a flow chart of a control method of a transmission provided in another embodiment of the present disclosure;

FIG. 3 is a flow chart of a method of clutch state detection provided by an embodiment of the present disclosure;

fig. 4 is a schematic structural view of a control device of a gearbox according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, a further description of aspects of the present disclosure will be provided below. It should be noted that, without conflict, the embodiments of the present disclosure and features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the disclosure.

The driving modes of the P2 hybrid vehicle comprise a pure electric mode, a hybrid mode and a pure engine mode, and compared with a traditional AT gearbox, an automatic (Auto Transmission, AT) gearbox carried by the P2 hybrid vehicle is structurally provided with a C0 clutch, wherein the hydraulic torque converter is omitted, and when the C0 clutch is combined with an engine to be rigidly connected with an input shaft of the gearbox, the engine rotating speed is equal to the rotating speed of the input shaft of the gearbox. When the P2 hybrid vehicle is driven to run at a low speed by using the hybrid mode or the pure engine mode, the ratio of the rotating speed of the input shaft to the rotating speed of the output shaft of the gearbox is larger than the first gear transmission ratio, and one clutch in the gearbox is required to be controlled to be in a sliding friction state under the working condition so that the heat generated when the clutch outputs power in the sliding friction state is in direct proportion to the torque transmitted by the clutch, a gearbox cooling system can continuously cool the clutch, but when the heat continuously accumulated in the clutch is larger than a safety value due to the limitation of the cooling capacity of the gearbox cooling system, the friction plate of the clutch is damaged, so that the performance of the friction plate is reduced, even the clutch is invalid, and the service life of the clutch is shortened.

In the prior art, in order to protect the safety of a gearbox, when a clutch is driven in a slipping state, the slipping time and the slipping numerical value of the clutch are detected, after a certain time is exceeded, the gearbox sends a first torque limiting instruction to an engine, the engine is controlled to reduce torque, so that the torque transmitted by the clutch is reduced, after the initial torque limiting for a certain time is continued, if the rotating speed of an input shaft and the rotating speed of an output shaft do not reach the condition of locking the clutch (the condition of locking the clutch is that the rotating speed of the output shaft is reversely pushed through the speed of a vehicle, the rotating speed of the input shaft is reversely pushed according to a first gear transmission ratio to be larger than the minimum rotating speed of the engine, so that the engine does not have the risk of flameout), the gearbox still is in the slipping state, the torque of the engine is controlled to be close to zero, and the clutch is controlled to be separated from the slipping state, so that the gearbox is protected.

In the prior art, when the vehicle runs AT a low speed, the AT gearbox uses the same clutch to carry out sliding friction control, when the clutch is controlled to enter a sliding friction state, and when the other three clutches are in a locking state, the clutch entering the sliding friction state faces sliding friction loss, so that the service life of the clutch is low, and when the clutch is damaged, even if the other clutches are intact, the function of the AT gearbox is also invalid. The AT gearbox manufacturer aims AT the problem that the low-speed running capacity of the gearbox is enhanced and the safety of the clutch is protected by adopting a method for improving the cooling capacity of the friction plate group and increasing the number of the friction plate groups, but the method is too high in cost.

In addition, when the P2 hybrid vehicle runs AT a low speed in a sliding mode for more than a certain time, the AT gearbox limits the torque of the engine and even controls the vehicle to run abnormally, so that the vehicle stops in a fault mode, the passing capacity of the vehicle is reduced, and when the application scene is that the P2 hybrid vehicle climbs a long slope AT a low speed, if the torque of the engine is reduced or the vehicle stops in a fault mode, the driving safety is seriously affected.

In view of this problem, embodiments of the present disclosure provide a control method for a transmission, which is described below in connection with specific embodiments.

Fig. 1 is a flowchart of a control method of a gearbox according to an embodiment of the present disclosure. The method may be performed by a control device of a gearbox, which may be implemented in software and/or hardware, which may be configured in an electronic device, such as a server or a terminal, wherein the terminal specifically comprises a hybrid vehicle, a fuel vehicle or the like. In addition, the method can be applied to the application scene of control of the gearbox, in particular to the application scene of running at a speed lower than a preset speed, such as climbing of a heavy-duty vehicle, frequent large-throttle starting of the vehicle in a short time, running when the battery of the vehicle is low, running when a motor of the vehicle is in fault and the like. It can be appreciated that the control method of the gearbox provided by the embodiment of the disclosure may also be applied in other scenarios.

A control method of the gearbox shown in fig. 1 is described below, which gearbox comprises at least two clutches, which method comprises the following specific steps:

and S101, judging whether a first clutch is in a safe state when the gearbox enters sliding friction control, wherein the first clutch is any clutch of the gearbox.

When the gearbox enters the sliding friction control, whether the first clutch is in a safe state or not is judged, and the first clutch is any clutch of the gearbox.

Optionally, when the gearbox enters the slip friction control, determining whether a first clutch is in a safe state, wherein the first clutch is before any clutch of the gearbox, and the method further comprises: and identifying whether the gearbox enters sliding friction control or not based on the fact that the running speed of the vehicle is lower than a preset speed.

Specifically, when the running speed of the vehicle is lower than a preset speed, whether the gearbox enters the sliding friction control is identified, wherein the preset speed can be set manually or according to a system.

And S102, when the first clutch is in a safe state, controlling the first clutch to carry out sliding friction control, and controlling other clutches except the first clutch to be locked.

When the first clutch is in a safe state, the first clutch is controlled to conduct sliding friction control, and other clutches except the first clutch are controlled to be locked.

Optionally, after controlling the first clutch to perform slip control when the first clutch is in a safe state, the method further includes: and changing the state of the first clutch from the safe state to a temperature-raising state.

Specifically, when the first clutch is controlled to perform slip control, the state of the first clutch is changed from the safe state to the temperature-increasing state.

Optionally, after changing the state of the first clutch from the safe state to the warm-up state, the method further includes: when the first clutch performs slip control, accumulating first heat of the first clutch, and determining a first accumulation time for accumulating the first heat; changing the state of the first clutch from the warm-up state to a superheated state based on the first heat exceeding a first preset heat; and/or changing the state of the first clutch from a warm-up state to a superheated state based on the first accumulation time being greater than a first preset time, the first preset time being a maximum safe slip time determined by a first clutch hardware characteristic of the transmission.

Specifically, when the first clutch performs slip control, the state of the first clutch is changed from a safe state to a temperature-increasing state, the first heat of the first clutch is stored, and a first storage time for storing the first heat is determined; the state of the first clutch is changed from the warm-up state to the superheated state based on the first heat exceeding a first preset heat, which is a maximum safe accumulated heat determined by a first clutch hardware characteristic of the transmission.

Specifically, when the first clutch is slip-controlled, the state of the first clutch is changed from a safe state to a temperature-increasing state, the first heat of the first clutch is accumulated, a first accumulation time for accumulating the first heat is determined, and the state of the first clutch is changed from the temperature-increasing state to an overheat state based on the first accumulation time being longer than a first preset time, which is the maximum safe slip time determined by the hardware characteristics of the first clutch of the transmission.

S103, judging whether a second clutch is in a safe state or not when the state of the first clutch is changed to an overheat state, wherein the second clutch is any clutch except the first clutch of the gearbox.

When the state of the first clutch is changed to the overheat state, it is determined whether or not the second clutch is in a safe state, and the second clutch is any one of the clutches of the transmission other than the first clutch.

And S104, when the second clutch is in a safe state, controlling the second clutch to carry out sliding friction control, and controlling other clutches except the second clutch to be locked.

And when the second clutch is in a safe state, controlling the second clutch to carry out sliding friction control, and controlling other clutches except the second clutch to be locked.

Optionally, after controlling the second clutch to perform slip control when the second clutch is in a safe state, the method further includes: and changing the state of the second clutch from a safe state to a temperature-raising state.

Specifically, when the second clutch is controlled to perform slip control, the state of the second clutch is changed from the safe state to the temperature-increasing state.

Optionally, after changing the state of the second clutch from the safe state to the warm-up state, the method further includes: when the second clutch performs slip control, accumulating second heat of the second clutch, and determining a second accumulation time for accumulating the second heat; changing the state of the second clutch from the warm-up state to a superheated state based on the second heat exceeding a second preset heat; and/or changing the state of the second clutch from a warm-up state to a superheated state based on the second accumulation time being greater than a second preset time, the second preset time being a maximum safe slip time determined by a transmission second clutch hardware characteristic.

Specifically, when the second clutch performs slip control, changing the state of the second clutch from a safe state to a temperature-increasing state, accumulating the second heat of the second clutch, and determining a second accumulation time for accumulating the second heat; the state of the second clutch is changed from the warm-up state to the superheated state based on the second heat exceeding a second preset heat, which is a maximum safe accumulated heat determined by the transmission second clutch hardware characteristics.

Specifically, when the second clutch is slip-controlled, the state of the second clutch is changed from the safe state to the warm-up state, the second heat of the second clutch is stored, the second storage time for storing the second heat is determined, and the state of the second clutch is changed from the warm-up state to the overheat state based on the second storage time being longer than a second preset time, which is the maximum safe slip time determined by the hardware characteristics of the second clutch of the transmission.

Optionally, controlling other clutch locks than the second clutch includes: controlling the first clutch to be locked, and changing the state of the first clutch from the overheat state to a cooling state; determining a first cooling time for changing the first clutch from the cooling state to the safe state, the first cooling time being determined based on a first accumulation time for accumulating a first amount of heat of the first clutch; and changing the state of the first clutch from the cooling state to the safe state based on the first time when the state of the first clutch is the cooling state exceeding the first cooling time.

Specifically, the first clutch is controlled to be locked, the state of the first clutch is changed from an overheat state to a cooling state, and the gearbox cooling system is used for cooling the first clutch; determining a first cooling time for changing the first clutch from the cooling state to the safe state, the first cooling time being determined based on a first accumulation time for accumulating a first amount of heat of the first clutch; the state of the first clutch is changed from the cooling state to the safe state based on the first time when the state of the first clutch is the cooling state exceeding the first cooling time.

Optionally, the method further comprises: determining that neither of the at least two clutches supports slip control when neither of the at least two clutches is in a safe state; and controlling the gearbox to send out a torque limiting request.

Specifically, when at least two clutches are not in a safe state, it is determined that at least two clutches do not support slip control, and the gearbox is controlled to send a torque limiting request. The engine is controlled to reduce torque and thus reduce torque transferred by the clutch until the torque of the engine is controlled to be below a preset threshold, such as the torque of the engine is controlled to infinitely approach 0, so that the clutch is controlled to be disengaged and the gearbox is protected.

Optionally, after controlling the gearbox to issue a torque limiting request, the method further comprises: receiving states of the at least two clutches in real time; and when any one clutch of the at least two clutches is changed to a safe state, controlling the gearbox to cancel the torque limiting request, and executing the step of judging whether the first clutch is in the safe state or not when the gearbox enters the sliding friction control.

Specifically, states of at least two clutches are received in real time; and when any one of the at least two clutches is changed to a safe state, controlling the gearbox to cancel the torque limiting request, and executing the step of judging whether the first clutch is in the safe state when the gearbox enters the sliding friction control.

According to the embodiment of the disclosure, the first clutch in the safe state is flexibly selected to carry out sliding friction control according to the states of the at least two clutches of the gearbox, and the second clutch in the safe state is timely switched to carry out sliding friction control when the first clutch is in the overheat state, so that the service lives of the at least two clutches are prolonged, the service time of the gearbox under the sliding friction control working condition is prolonged, and the safety and the market competitiveness of the gearbox are improved on the premise of not increasing the cost of the gearbox.

In some embodiments, the transmission includes three clutches, and when the state of the second clutch is changed to the overheated state after S101-S104 is performed, it is determined whether a third clutch is in a safe state, and the third clutch is any one clutch of the transmission except the first clutch and the second clutch. And when the third clutch is in a safe state, controlling the third clutch to perform sliding friction control, and controlling other clutches except the third clutch to be locked.

When the state of the second clutch is changed to the overheat state, it is determined whether or not a third clutch is in a safe state, and the third clutch is any one clutch of the transmission except the first clutch and the second clutch. And when the third clutch is in a safe state, controlling the third clutch to perform sliding friction control, and controlling other clutches except the third clutch to be locked.

Optionally, after controlling the third clutch to perform slip control when the third clutch is in a safe state, the method further includes: and changing the state of the third clutch from a safe state to a temperature-raising state.

Optionally, after changing the state of the third clutch from the safe state to the warm-up state, the method further includes: when the third clutch performs slip control, accumulating third heat of the third clutch, and determining a third accumulation time for accumulating the third heat; changing the state of the third clutch from the warm-up state to a superheated state based on the third heat exceeding a third preset heat; and/or changing the state of the third clutch from the warm-up state to the overheat state based on the third accumulation time being greater than a third preset time, the third preset time being a maximum safe slip time determined by a third clutch hardware characteristic of the transmission.

Specifically, when the third clutch performs slip control, the state of the third clutch is changed from the safe state to the temperature-increasing state, the third heat of the third clutch is stored, and a third storage time for storing the third heat is determined; and changing the state of the third clutch from the warm-up state to the overheat state based on the third heat exceeding a third preset heat, the third preset heat being a maximum safe accumulated heat determined by a third clutch hardware characteristic of the transmission.

Specifically, when the third clutch is slip-controlled, the state of the third clutch is changed from the safe state to the warm-up state, the third heat of the third clutch is stored, the third storage time for storing the third heat is determined, and the state of the third clutch is changed from the warm-up state to the overheat state based on the third storage time being longer than a third preset time, which is the maximum safe slip time determined by the hardware characteristics of the third clutch of the transmission.

Optionally, controlling other clutch locks than the third clutch includes: controlling the second clutch to be locked, and changing the state of the second clutch from the overheat state to a cooling state; determining a second cooling time for changing the second clutch from the cooling state to the safe state, the second cooling time being determined based on a second accumulation time for accumulating a second amount of heat of the second clutch; and changing the state of the second clutch from the cooling state to the safe state based on the second time when the state of the second clutch is the cooling state exceeding the second cooling time.

Specifically, the second clutch is controlled to be locked, the state of the second clutch is changed from an overheat state to a cooling state, and the gearbox cooling system is used for cooling the second clutch; determining a second cooling time for changing the second clutch from the cooling state to the safe state, the second cooling time being determined based on a second accumulation time for accumulating a second heat of the second clutch; and changing the state of the second clutch from the cooling state to the safe state based on the second time when the state of the second clutch is the cooling state exceeding the second cooling time.

In some embodiments, the transmission includes four clutches, S101-S104 are performed, and when the state of the second clutch is changed to the overheat state, it is determined whether a third clutch is in a safe state, and the third clutch is any one clutch of the transmission other than the first clutch and the second clutch. When the third clutch is in a safe state, the third clutch is controlled to carry out sliding friction control, after other clutches except the third clutch are controlled to be locked, when the state of the third clutch is changed to an overheat state, whether a fourth clutch is in the safe state is judged, and the fourth clutch is a clutch except the first clutch, the second clutch and the third clutch of the gearbox. And when the fourth clutch is in a safe state, controlling the fourth clutch to perform sliding friction control, and controlling other clutches except the fourth clutch to be locked.

When the state of the third clutch is changed to the overheat state, whether a fourth clutch is in a safe state is judged, wherein the fourth clutch is a clutch except the first clutch, the second clutch and the third clutch of the gearbox. And when the fourth clutch is in a safe state, controlling the fourth clutch to carry out sliding friction control and controlling other clutches except the fourth clutch to be locked.

Optionally, after controlling the fourth clutch to perform slip control when the fourth clutch is in a safe state, the method further includes: and changing the state of the fourth clutch from a safe state to a temperature-raising state.

Optionally, after changing the state of the fourth clutch from the safe state to the warm-up state, the method further includes: when the fourth clutch performs slip control, accumulating fourth heat of the fourth clutch, and determining a fourth accumulation time for accumulating the fourth heat; changing the state of the fourth clutch from the warm-up state to a superheated state based on the fourth heat exceeding a fourth preset heat; and/or changing the state of the fourth clutch from the warm-up state to the overheat state based on the fourth accumulation time being greater than a fourth preset time, the fourth preset time being a maximum safe slip time determined by a fourth clutch hardware characteristic of the transmission.

Specifically, when the fourth clutch performs slip control, the state of the fourth clutch is changed from the safe state to the temperature-increasing state, fourth heat of the fourth clutch is stored, and a fourth storage time for storing the fourth heat is determined; and changing the state of the fourth clutch from the warm-up state to the overheat state based on the fourth heat exceeding a fourth preset heat, which is a maximum safe accumulated heat determined by the fourth clutch hardware characteristic of the transmission.

Specifically, when the fourth clutch is slip-controlled, the state of the fourth clutch is changed from the safe state to the warm-up state, fourth heat of the fourth clutch is stored, fourth storage time for storing the fourth heat is determined, and based on the fourth storage time being longer than a fourth preset time, the state of the fourth clutch is changed from the warm-up state to the overheat state, and the fourth preset time is the maximum safe slip time determined by the hardware characteristics of the fourth clutch of the transmission.

Optionally, controlling other clutch locks than the fourth clutch includes: controlling the third clutch to be locked, and changing the state of the third clutch from the overheat state to a cooling state; determining a third cooling time for changing the third clutch from the cooling state to the safe state, the third cooling time being determined based on a third accumulation time for accumulating a third amount of heat of the third clutch; and changing the state of the third clutch from the cooling state to the safe state based on the third time when the state of the third clutch is the cooling state exceeding the third cooling time.

Specifically, the third clutch is controlled to be locked, the state of the third clutch is changed from the overheat state to the cooling state, and the gearbox cooling system is used for cooling the third clutch; determining a third cooling time for changing the third clutch from the cooling state to the safe state, the third cooling time being determined based on a third accumulation time for accumulating a third heat of the third clutch; and changing the state of the third clutch from the cooling state to the safe state based on the third time when the state of the third clutch is the cooling state exceeding the third cooling time.

Optionally, the method further comprises: determining that none of the first clutch, the second clutch, the third clutch, and the fourth clutch supports slip control when none of the first clutch, the second clutch, the third clutch, and the fourth clutch is in a safe state; and controlling the gearbox to send out a torque limiting request.

Specifically, when none of the first clutch, the second clutch, the third clutch, and the fourth clutch is in a safe state, it is determined that none of the first clutch, the second clutch, the third clutch, and the fourth clutch supports slip control; the control gearbox sends out a torque limiting request, and the torque limiting request specifically refers to controlling the gearbox to send out a torque limiting instruction to the engine, and controlling the engine to reduce torque, so that torque transmitted by the first clutch, the second clutch, the third clutch and the fourth clutch is reduced.

Optionally, after controlling the gearbox to issue a torque limiting request, the method further comprises: receiving states of the first clutch, the second clutch, the third clutch and the fourth clutch in real time; and when any one of the first clutch, the second clutch, the third clutch and the fourth clutch is changed to a safe state, controlling the gearbox to cancel the torque limiting request, and executing the step of judging whether the first clutch is in the safe state when the gearbox enters the sliding friction control.

Specifically, after the transmission is controlled to send out a torque limiting request, states of the first clutch, the second clutch, the third clutch and the fourth clutch are received in real time; and when any one of the first clutch, the second clutch, the third clutch and the fourth clutch is changed to a safe state, controlling the gearbox to cancel the torque limiting request, and executing the steps of judging whether the first clutch is in the safe state or not when the gearbox enters the sliding friction control.

It can be understood that at least two clutches in the gearbox may also be five, six or more clutches, and when the clutches of the gearbox are five, six or more, the implementation manner and implementation principle are the same as those of the two, three or four clutches, and the embodiment is not repeated.

In some embodiments, under the condition of not increasing the cost of the gearbox, in the prior art, four clutches C0 and A, B, C exist in the gearbox, and the friction resistance of the four clutches C0 and A, B, C is different, the friction resistance is determined according to the clutch heat generating capacity and the cooling capacity, the slower the heat accumulation, the stronger the friction resistance of the clutch is, wherein, the friction resistance of the C > the friction resistance of the a > the friction resistance of the B > the friction resistance of the C0, each clutch has four states, namely, a Safety Condition (SC), a heating state (HP), a overheat state (hot, HT) and a cooling state (CL), the heating state indicates that the clutch generates heat when the clutch enters a sliding friction state, the overheat state indicates that the time of the clutch accumulating heat exceeds a preset time, the cooling state indicates that the clutch is in a cooling process when the clutch is locked or opened, the configuration condition is configured, the clutch can enter the SC state, the clutch is in a preset time corresponding to the clutch, the clutch is set to a preset time, the clutch is set to be changed from the preset time, the clutch is set to the high, and the clutch is set to the high when the clutch is in the HP.

Fig. 2 is a flowchart of a control method of a gearbox provided in another embodiment of the present disclosure, when the gearbox enters into a sliding friction control, it is determined whether the C clutch is in an SC state, if the C clutch is in the SC state, the C clutch is controlled to slide friction, at this time, the C clutch enters into an HP state, and when the time that the C clutch is in the HP state is greater than or equal to a preset time set by the C clutch, the C clutch enters into an HT state, and it is understood that when the time that the C clutch is in the HP state is less than the preset time set by the C clutch, the C clutch may be controlled to slide friction. If the C clutch is not in the SC state and/or when the C clutch is in the HT state, determining whether the a clutch is in the SC state, if the a clutch is in the SC state, controlling the a clutch to slip, controlling the other 3 clutches to lock, i.e., controlling the C0 clutch, the B clutch and the C clutch to lock, when the a clutch is in the HP state, and when the time that the a clutch is in the HP state is greater than or equal to the preset time set by the a clutch, the a clutch is in the HT state, and it is understood that the a clutch slip may be continuously controlled when the time that the a clutch is in the HP state is less than the preset time set by the a clutch. When the a clutch enters the HT state, the step of executing when the transmission enters the slip control is returned. If the A clutch is not in the SC state, judging whether the B clutch is in the SC state, if the B clutch is in the SC state, controlling the B clutch to slip and rub, controlling the other 3 clutches to be locked, namely controlling the C0 clutch, the A clutch and the C clutch to be locked, wherein the B clutch enters the HP state at the moment, and when the time of the B clutch in the HP state is greater than or equal to the preset time set by the B clutch, the B clutch enters the HT state, and it is understood that the B clutch can be continuously controlled to slip and rub when the time of the B clutch in the HP state is less than the preset time set by the B clutch. When the B clutch enters the HT state, the step of executing when the transmission enters the slip control is returned. If the B clutch is not in the SC state, judging whether the C0 clutch is in the SC state, if the C0 clutch is in the SC state, controlling the C0 clutch to slip, controlling the other 3 clutches to be locked, namely controlling the B clutch, the A clutch and the C clutch to be locked, wherein the C0 clutch enters the HP state at the moment, and when the time of the C0 clutch in the HP state is greater than or equal to the preset time set by the C0 clutch, the C0 clutch enters the HT state, and it can be understood that the C0 clutch can be continuously controlled to slip when the time of the C0 clutch in the HP state is less than the preset time set by the C0 clutch. When the C0 clutch enters the HT state, the step of executing when the transmission enters the slip control is returned. And if the C0 clutch is not in the SC state, controlling the gearbox to send out a torque limiting request, and protecting the gearbox. Judging whether any one clutch among the C0 clutch, the A clutch, the B clutch and the C clutch is in an SC state, if not, continuously controlling the gearbox to send out a torque limiting request, and protecting the gearbox; if so, the step of executing when the transmission enters the slip control is returned.

Specifically, as shown in fig. 2, the control method of the gearbox comprises the following specific steps:

s201, the gearbox enters sliding friction control.

S202, judging whether the C clutch is in an SC state, if so, executing S203; if not, S205 is performed.

S203, controlling slip friction of the C clutch.

S204, judging whether the C clutch is in an HT state, if so, executing S205; if not, S203 is performed.

S205, judging whether the clutch A is in an SC state, if so, executing S206; if not, S208 is performed.

S206, controlling the slipping friction of the clutch A and locking other clutches.

S207, judging whether the clutch A is in an HT state, if so, executing S201; if not, S206 is performed.

S208, judging whether the clutch B is in an SC state, if so, executing S209; if not, S211 is executed.

S209, controlling the slipping friction of the clutch B and locking other clutches.

S210, judging whether the clutch B is in an HT state, if so, executing S201; if not, S209 is performed.

S211, judging whether the C0 clutch is in an SC state, if so, executing S212; if not, S214 is performed.

S212, controlling slipping friction of the C0 clutch and locking other clutches.

S213, judging whether the C0 clutch is in an HT state, if so, executing S201; if not, S212 is performed.

S214, the gearbox sends out a torque limiting request.

S215, judging whether any clutch is in an SC state, if so, executing S201; if not, S214 is performed.

Fig. 3 is a flowchart of a method for detecting a clutch state according to an embodiment of the present disclosure, where, for any one of the first clutch, the second clutch, the third clutch, the fourth clutch, the C0 clutch, the a clutch, the B clutch, and the C clutch, an initial state of the clutch is an SC state, an initial time t0= 0, and t1= 0; judging whether the clutch enters the sliding friction control, if the clutch does not enter the sliding friction control, returning to execute the steps of executing the initial state of the clutch to be the SC state, wherein the initial time t0= 0, t1= 0 and the like; if the clutch enters slip control, changing the clutch state to an HP state; increasing time t0 by 10ms; judging whether the time T0 is greater than or equal to T0, wherein it is understood that T0 is the maximum safe sliding time determined by the hardware characteristics of the gearbox; if T0> =t0, changing the clutch state to HT state, controlling the clutch to lock, and changing the clutch state to CL state; if T0 is less than T0, judging whether the clutch is in a locking or opening state, and if the clutch is not in the locking or opening state, returning to execute the steps of increasing the time T0 by 10ms and the like; if the clutch enters a closed or open state, changing the clutch state to a CL state; increasing time t1 by 10ms; judging whether T1 is greater than or equal to T1, it can be understood that T1 is obtained by checking a corresponding cooling value by maintaining the sliding time T0, specifically, the greater T0 causes more accumulated heat, and correspondingly, longer T1 time is required for cooling; if T1> =t1, the initial state of the executing clutch is SC state, the initial time t0= =0, t1= =0, and the like, and if T1< T1, the executing clutch returns to the step of increasing the time T1 by 10ms, and the like.

Specifically, as shown in fig. 3, the method for detecting the clutch state includes the following specific steps:

s301, the initial state of the clutch is SC state, and the initial time t0= 0, t1= 0.

S302, judging whether the clutch enters sliding friction, if so, executing S303; if not, S301 is performed.

S303, changing the clutch state to the HP state.

S304, timing t0=t0+10.

The time t0 is increased by 10ms.

S305, judging whether T0 is greater than or equal to T0, if so, executing S306; if not, S311 is performed.

S306, changing the clutch state to HT state.

S307, controlling the clutch to be locked.

S308, changing the clutch state to the Cl state.

S309, time t1=t1+10.

Time t1 is increased by 10ms.

S310, judging whether T1 is greater than or equal to T1, if so, executing S301; if not, S309 is performed.

S311, judging whether the clutch enters a locking state or an opening state, if so, executing S308; if not, S304 is performed.

Fig. 4 is a schematic structural diagram of a control device of a gearbox according to an embodiment of the present disclosure. The control means of the gearbox may be a terminal as in the previous embodiments, or the control means of the gearbox may be a part or assembly in the terminal. The control device for a gearbox provided in the embodiment of the present disclosure may execute a process flow provided in the control method embodiment of the gearbox, as shown in fig. 4, where the control device 400 for a gearbox includes: a first judging module 401, a first control module 402, a second judging module 403, and a second control module 404; the first judging module 401 is configured to judge whether a first clutch is in a safe state when the gearbox enters a sliding friction control, where the first clutch is any one clutch of the gearbox; a first control module 402, configured to control the first clutch to perform slip control and control other clutches except the first clutch to lock when the first clutch is in a safe state; a second judging module 403, configured to judge whether a second clutch is in a safe state when the state of the first clutch is changed to an overheated state, where the second clutch is any one clutch of the gearbox other than the first clutch; and the second control module 404 is used for controlling the second clutch to perform sliding friction control and controlling other clutches except the second clutch to be locked when the second clutch is in a safe state.

Optionally, the control device 400 of the gearbox further comprises: and the identifying module 405 is configured to identify whether the gearbox enters the sliding friction control based on the fact that the running speed of the vehicle is lower than a preset speed.

Optionally, the control device 400 of the gearbox further comprises: a changing module 406, configured to change the state of the first clutch from the safe state to a temperature-increasing state.

Optionally, the modification module 406 is further configured to store a first heat of the first clutch when the first clutch performs slip control, and determine a first storage time for storing the first heat; changing the state of the first clutch from the warm-up state to a superheated state based on the first heat exceeding a first preset heat; and/or changing the state of the first clutch from the warm-up state to the overheat state based on the first accumulation time being greater than a first preset time, the preset time being a maximum safe slip time determined by a hardware characteristic of the transmission.

Optionally, the control device 400 of the gearbox further comprises: a third control module 407 configured to determine that neither of the at least two clutches supports slip control when neither of the at least two clutches is in a safe state; and controlling the gearbox to send out a torque limiting request.

Optionally, the fifth control module 411 is further configured to receive states of the at least two clutches in real time; and when any one clutch of the at least two clutches is changed to a safe state, controlling the gearbox to cancel the torque limiting request, and executing the step of judging whether the first clutch is in the safe state or not when the gearbox enters the sliding friction control.

Optionally, a second control module 404 is configured to control the first clutch to be locked, and change a state of the first clutch from the overheated state to a cooled state; determining a first cooling time for changing the first clutch from the cooling state to the safe state, the first cooling time being determined based on a first accumulation time for accumulating a first amount of heat of the first clutch; and changing the state of the first clutch from the cooling state to the safe state based on the first time when the state of the first clutch is the cooling state exceeding the first cooling time.

The control device of the gearbox in the embodiment shown in fig. 4 may be used to implement the technical solution of the control method embodiment of the gearbox, and its implementation principle and technical effects are similar, and are not repeated here.

Fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure. The electronic device may be a terminal as described in the above embodiments. The electronic device provided in the embodiment of the present disclosure may execute the processing flow provided in the control method embodiment of the gearbox, as shown in fig. 5, where the electronic device 50 includes: memory 51, processor 52, computer programs and communication interface 53; wherein a computer program is stored in the memory 51 and configured to be executed by the processor 52 for the control method of the gearbox as described above.

In addition, the embodiment of the present disclosure also provides a computer-readable storage medium having stored thereon a computer program that is executed by a processor to implement the control method of the gearbox described in the above embodiment.

Furthermore, the disclosed embodiments also provide a computer program product comprising a computer program or instructions which, when executed by a processor, implements a method of controlling a gearbox as described above.

It should be noted that the computer readable medium described in the present disclosure may be a computer readable signal medium or a computer readable storage medium, or any combination of the two. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples of the computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this disclosure, a computer-readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In the present disclosure, however, the computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, with the computer-readable program code embodied therein. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: electrical wires, fiber optic cables, RF (radio frequency), and the like, or any suitable combination of the foregoing.

In some implementations, the clients, servers may communicate using any currently known or future developed network protocol, such as HTTP (HyperText Transfer Protocol ), and may be interconnected with any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network ("LAN"), a wide area network ("WAN"), the internet (e.g., the internet), and peer-to-peer networks (e.g., ad hoc peer-to-peer networks), as well as any currently known or future developed networks.

The computer readable medium may be contained in the electronic device; or may exist alone without being incorporated into the electronic device.

The computer readable medium carries one or more programs which, when executed by the electronic device, cause the electronic device to:

In addition, the electronic device may also perform other steps in the control method of the gearbox as described above.

Computer program code for carrying out operations of the present disclosure may be written in one or more programming languages, including, but not limited to, an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).

The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

The units involved in the embodiments of the present disclosure may be implemented by means of software, or may be implemented by means of hardware. Wherein the names of the units do not constitute a limitation of the units themselves in some cases.

The functions described above herein may be performed, at least in part, by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: a Field Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), an Application Specific Standard Product (ASSP), a system on a chip (SOC), a Complex Programmable Logic Device (CPLD), and the like.

In the context of this disclosure, a machine-readable medium may be a tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. The machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

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

The foregoing is merely a specific embodiment of the disclosure to enable one skilled in the art to understand or practice the disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown and described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of controlling a gearbox, the gearbox comprising at least two clutches, the method comprising:

2. The method of claim 1, wherein when the transmission enters the slip control, determining whether a first clutch is in a safe state, the first clutch being before any of the clutches of the transmission, the method further comprising:

And identifying whether the gearbox enters sliding friction control or not based on the fact that the running speed of the vehicle is lower than a preset speed.

3. The method of claim 1, wherein after controlling the first clutch for slip control when the first clutch is in a safe state, the method further comprises:

and changing the state of the first clutch from the safe state to a temperature-raising state.

4. A method according to claim 3, wherein after changing the state of the first clutch from the safe state to the warm-up state, the method further comprises:

when the first clutch performs slip control, accumulating first heat of the first clutch, and determining a first accumulation time for accumulating the first heat;

changing the state of the first clutch from the warm-up state to a superheated state based on the first heat exceeding a first preset heat; and/or

And changing the state of the first clutch from the heating state to the overheat state based on the first accumulation time being greater than a first preset time, wherein the preset time is the maximum safe slip time determined by the hardware characteristics of the gearbox.

5. The method according to claim 1, wherein the method further comprises:

determining that neither of the at least two clutches supports slip control when neither of the at least two clutches is in a safe state;

and controlling the gearbox to send out a torque limiting request.

6. The method of claim 5, wherein after controlling the transmission to issue a torque limiting request, the method further comprises:

receiving states of the at least two clutches in real time;

and when any one clutch of the at least two clutches is changed to a safe state, controlling the gearbox to cancel the torque limiting request, and executing the step of judging whether the first clutch is in the safe state or not when the gearbox enters the sliding friction control.

7. The method of claim 1, wherein controlling lockup of the other clutches than the second clutch comprises:

controlling the first clutch to be locked, and changing the state of the first clutch from the overheat state to a cooling state;

determining a first cooling time for changing the first clutch from the cooling state to the safe state, the first cooling time being determined based on a first accumulation time for accumulating a first amount of heat of the first clutch;

And changing the state of the first clutch from the cooling state to the safe state based on the first time when the state of the first clutch is the cooling state exceeding the first cooling time.

8. A control device for a gearbox, the device comprising:

9. An electronic device, comprising:

a memory;

a processor; and

a computer program;

wherein the computer program is stored in the memory and configured to be executed by the processor to implement the method of any of claims 1-7.

10. A computer readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, implements the method according to any of claims 1-7.