阅读说明：本技术 一种干式离合器滑摩功监控方法及设备 (Dry clutch sliding friction work monitoring method and device ) 是由 桂经良 王朝辉 马明霞 毕继明 于 2021-08-12 设计创作，主要内容包括：本申请涉及离合器领域,提供一种干式离合器滑摩功监控方法及设备,通过按照预设的监控周期,获取发动机转速、发动机扭矩、发送机转动惯量以及离合器从动盘转速；根据所述发动机转速确定发动机加速度,以及根据所述发动机转速和所述离合器从动盘转速,确定离合器滑摩转速差；对所述离合器滑摩转速差进行积分,得到离合器主从动盘的转角差,并根据所述转角差确定离合器扭矩传递失效标志位；根据所述发动机加速度、发动机扭矩、发送机转动惯量以及所述离合器滑摩转速差、离合器扭矩传递失效标志位,确定离合器滑摩功,从而基于离合器滑摩功的大小采取相应的保护措施,防止离合器温度过高导致离合器烧片,提高离合器的使用寿命。(The application relates to the field of clutches, and provides a dry clutch sliding friction work monitoring method and equipment, wherein the rotating speed of an engine, the torque of the engine, the rotational inertia of a transmitter and the rotating speed of a clutch driven disc are obtained according to a preset monitoring period; determining an engine acceleration according to the engine speed, and determining a clutch slip speed difference according to the engine speed and the clutch driven disc speed; integrating the sliding friction rotation speed difference of the clutch to obtain the rotation angle difference of a driving disc and a driven disc of the clutch, and determining a torque transmission failure zone bit of the clutch according to the rotation angle difference; and determining the clutch sliding friction work according to the engine acceleration, the engine torque, the transmitter rotational inertia, the clutch sliding friction and rotational speed difference and the clutch torque transmission failure zone bit, so that corresponding protective measures are taken based on the clutch sliding friction work, clutch burning caused by overhigh temperature of the clutch is prevented, and the service life of the clutch is prolonged.)

1. A method for monitoring the sliding friction work of a dry clutch is characterized by comprising the following steps:

according to a preset monitoring period, obtaining the rotating speed of an engine, the torque of the engine, the rotational inertia of a transmitter and the rotating speed of a clutch driven disc;

determining an engine acceleration according to the engine speed, and determining a clutch slip speed difference according to the engine speed and the clutch driven disc speed;

integrating the sliding friction rotation speed difference of the clutch to obtain the rotation angle difference of a driving disc and a driven disc of the clutch, and determining a torque transmission failure zone bit of the clutch according to the rotation angle difference;

and determining the clutch sliding friction work according to the engine acceleration, the engine torque, the transmitter rotational inertia, the clutch sliding friction rotational speed difference and the clutch torque transmission failure zone bit.

2. The method of claim 1, wherein determining a clutch slip speed differential based on the engine speed and the clutch disc speed comprises:

taking the rotation speed difference between the engine rotation speed and the clutch driven disc rotation speed as an initial rotation speed difference;

correcting the initial rotation speed difference according to a rotation speed difference correction value to obtain a corrected rotation speed difference, wherein the rotation speed difference correction value is obtained according to the acceleration of the engine or the acceleration of a clutch driven disc, and the acceleration of the clutch driven disc is determined according to the rotation speed of the clutch driven disc;

and if the corrected rotation speed difference is not less than a preset first calibration threshold value, determining the corrected rotation speed difference as the clutch slip rotation speed difference.

3. The method of claim 1, wherein determining clutch slip based on the engine acceleration, engine torque, transmitter rotational inertia, and the clutch slip speed differential, clutch torque transfer failure flag comprises:

determining an engine inertia torque according to the engine acceleration and the rotational inertia of the transmitter;

determining clutch slip torque based on the engine torque and the engine inertia torque;

and when the clutch torque transmission failure zone bit is a preset value, determining the clutch sliding friction work according to the clutch sliding friction torque and the clutch sliding friction rotating speed difference.

4. The method of claim 3, wherein determining clutch slip work based on the clutch slip torque and the clutch slip rotational speed difference comprises:

taking the product of the clutch friction torque and the clutch friction rotating speed difference as the friction power of the current monitoring period, and determining the friction heat of the current monitoring period;

determining the heat dissipation capacity of the current monitoring period according to the heat dissipation power, wherein the heat dissipation power is obtained by searching according to the rotating speed of the engine and the sliding friction heat as indexes;

and determining the difference value of the heat quantity of the current monitoring period and the heat dissipation quantity of the current monitoring period as the clutch sliding friction work.

5. The method of claim 3, wherein after determining clutch slip work, the method further comprises:

and when the timing time of the monitoring period is greater than a preset time threshold value, resetting the clutch sliding friction power to a preset calibration value.

6. The method of claim 1, wherein said determining a clutch torque transfer failure flag based on said difference in rotation angle comprises:

and if the rotation angle difference is larger than a preset second calibration threshold value, determining that the clutch is not completely engaged, and setting the torque transmission failure zone bit of the clutch to be a preset value under the condition that the clutch is not completely engaged.

7. The method of any one of claims 1-6, further comprising:

if the sliding friction work of the clutch is larger than the heat threshold value, sending alarm information; or

And determining the heat level corresponding to the clutch sliding friction work according to the preset heat value interval of the clutch sliding friction work, and adopting a control strategy matched with the heat level.

8. A dry clutch for monitoring clutch slip work, comprising:

the acquisition module is used for acquiring the rotating speed of an engine, the torque of the engine, the rotational inertia of a transmitter and the rotating speed of a clutch driven disc according to a preset monitoring period;

the engine acceleration calculation module is used for determining the acceleration of the engine according to the rotating speed of the engine;

the slip friction rotation speed difference calculation module is used for determining the slip friction rotation speed difference of the clutch according to the rotation speed of the engine and the rotation speed of the clutch driven disc;

the rotating speed difference integrating module is used for integrating the sliding friction rotating speed difference of the clutch to obtain the rotating angle difference of a driving disc and a driven disc of the clutch;

the clutch torque transmission failure marking module is used for determining a clutch torque transmission failure marking position according to the rotation angle difference;

and the clutch sliding friction work calculation module is used for determining the clutch sliding friction work according to the engine acceleration, the engine torque, the transmitter rotational inertia, the clutch sliding friction rotational speed difference and the clutch torque transmission failure zone bit.

9. The dry clutch of claim 8, further comprising a speed difference correction module to:

taking the rotation speed difference between the engine rotation speed and the clutch driven disc rotation speed as an initial rotation speed difference;

correcting the initial rotation speed difference according to a rotation speed difference correction value to obtain a corrected rotation speed difference, wherein the rotation speed difference correction value is obtained according to the acceleration of the engine or the acceleration of a clutch driven disc, and the acceleration of the clutch driven disc is determined according to the rotation speed of the clutch driven disc;

and if the corrected rotation speed difference is not less than a preset first calibration threshold value, determining the corrected rotation speed difference as the clutch slip rotation speed difference.

10. The dry clutch of claim 8, wherein the clutch slip work calculation module includes an engine inertia torque calculation unit, a clutch slip work calculation unit;

the engine inertia torque calculation unit is used for determining the engine inertia torque according to the engine acceleration and the rotational inertia of the transmitter;

the clutch sliding friction torque calculation unit is used for determining clutch sliding friction torque according to the engine torque and the engine inertia torque;

and the clutch sliding friction work calculation unit is used for determining the clutch sliding friction work according to the difference between the clutch sliding friction torque and the clutch sliding friction rotating speed when the clutch torque transmission failure zone bit is a preset value.

Technical Field

The application relates to the field of clutches, in particular to a method and equipment for monitoring sliding friction work of a dry clutch.

Background

The clutch is the component of the automobile transmission system directly connected with the engine and is responsible for the disconnection and connection of the power and the transmission system. Clutch slippage can occur during vehicle hard braking or the like.

Currently, whether the clutch generates the slip is mainly determined based on the comparison result of the rotating speed difference between the main driving plate and the auxiliary driving plate of the clutch and the threshold value, and then whether the clutch is completely engaged or whether the torque capacity of the clutch is enough is judged according to the comparison result. Generally, the rotating speeds of the clutch master-slave dynamic plates are respectively replaced by the rotating speed of an engine and the rotating speed of an input shaft of a gearbox, the rotating speed deviation can be caused by the factors such as a detection mechanism, sampling frequency, sensor error, signal filtering and the like of the engine and the rotating speed of the input shaft of the gearbox, and when the torque transmitted by the clutch master-slave dynamic plates changes due to the existence of a torsional damper between the clutch slave-plate plates and a hub, the instantaneous rotating speed difference still can occur in the clutch master-slave dynamic plates even if the clutch does not slip. Therefore, it is not accurate enough to determine whether the clutch is fully engaged or whether the clutch torque capacity is sufficient based on the rotation speed difference.

Generally, the sliding friction of the clutch can generate heat, so that the temperature of the clutch is increased in the semi-linkage process, the clutch plate is easy to be ablated, and the service life of the clutch is influenced. Compared with other types of clutches, the dry clutch has poor heat dissipation performance due to no engine oil cooling, and the phenomenon of clutch overheating is avoided. Therefore, for the dry clutch, it is important to accurately monitor the heat generated by the slipping friction of the clutch after recognizing the slipping friction of the clutch so as to take corresponding protective measures.

Disclosure of Invention

The application provides a method and a device for monitoring the sliding friction work of a dry clutch, which are used for accurately identifying the sliding friction of the clutch and calculating the sliding friction work, thereby prolonging the service life of the clutch.

In a first aspect, an embodiment of the present application provides a method for monitoring sliding friction work of a dry clutch, including:

according to a preset monitoring period, obtaining the rotating speed of an engine, the torque of the engine, the rotational inertia of a transmitter and the rotating speed of a clutch driven disc;

determining an engine acceleration according to the engine speed, and determining a clutch slip speed difference according to the engine speed and the clutch driven disc speed;

integrating the sliding friction rotation speed difference of the clutch to obtain the rotation angle difference of a driving disc and a driven disc of the clutch, and determining a torque transmission failure zone bit of the clutch according to the rotation angle difference;

and determining the clutch sliding friction work according to the engine acceleration, the engine torque, the transmitter rotational inertia, the clutch sliding friction rotational speed difference and the clutch torque transmission failure zone bit.

Optionally, the determining a clutch slip rotational speed difference according to the engine rotational speed and the clutch driven disc rotational speed includes:

taking the rotation speed difference between the engine rotation speed and the clutch driven disc rotation speed as an initial rotation speed difference;

correcting the initial rotation speed difference according to a rotation speed difference correction value to obtain a corrected rotation speed difference, wherein the rotation speed difference correction value is obtained according to the acceleration of the engine or the acceleration of a clutch driven disc, and the acceleration of the clutch driven disc is determined according to the rotation speed of the clutch driven disc;

and if the corrected rotation speed difference is not less than a preset first calibration threshold value, determining the corrected rotation speed difference as the clutch slip rotation speed difference.

Optionally, the determining the clutch slip work according to the engine acceleration, the engine torque, the rotational inertia of the transmitter, the clutch slip rotational speed difference, and the clutch torque transmission failure flag bit includes:

determining an engine inertia torque according to the engine acceleration and the rotational inertia of the transmitter;

determining clutch slip torque based on the engine torque and the engine inertia torque;

and when the clutch torque transmission failure zone bit is a preset value, determining the clutch sliding friction work according to the clutch sliding friction torque and the clutch sliding friction rotating speed difference.

Optionally, the determining the clutch slip work according to the clutch slip torque and the clutch slip rotational speed difference includes:

taking the product of the clutch friction torque and the clutch friction rotating speed difference as the friction power of the current monitoring period, and determining the friction heat of the current monitoring period;

determining the heat dissipation capacity of the current monitoring period according to the heat dissipation power, wherein the heat dissipation power is obtained by searching according to the rotating speed of the engine and the sliding friction heat as indexes;

and determining the difference value of the heat quantity of the current monitoring period and the heat dissipation quantity of the current monitoring period as the clutch sliding friction work.

Optionally, after determining the clutch slip work, the method further includes:

and when the timing time of the monitoring period is greater than a preset time threshold value, resetting the clutch sliding friction power to a preset calibration value.

Optionally, the determining a clutch torque transmission failure flag according to the rotation angle difference includes:

and if the rotation angle difference is larger than a preset second calibration threshold value, determining that the clutch is not completely engaged, and setting the torque transmission failure zone bit of the clutch to be a preset value under the condition that the clutch is not completely engaged.

Optionally, the method further includes:

if the sliding friction work of the clutch is larger than the heat threshold value, sending alarm information; or

And determining the heat level corresponding to the clutch sliding friction work according to the preset heat value interval of the clutch sliding friction work, and adopting a control strategy matched with the heat level.

In a second aspect, embodiments of the present application provide a dry clutch for monitoring clutch slip work, including:

the acquisition module is used for acquiring the rotating speed of an engine, the torque of the engine, the rotational inertia of a transmitter and the rotating speed of a clutch driven disc according to a preset monitoring period;

the engine acceleration calculation module is used for determining the acceleration of the engine according to the rotating speed of the engine;

the slip friction rotation speed difference calculation module is used for determining the slip friction rotation speed difference of the clutch according to the rotation speed of the engine and the rotation speed of the clutch driven disc;

the rotating speed difference integrating module is used for integrating the sliding friction rotating speed difference of the clutch to obtain the rotating angle difference of a driving disc and a driven disc of the clutch;

the clutch torque transmission failure marking module is used for determining a clutch torque transmission failure marking position according to the rotation angle difference;

and the clutch sliding friction work calculation module is used for determining the clutch sliding friction work according to the engine acceleration, the engine torque, the transmitter rotational inertia, the clutch sliding friction rotational speed difference and the clutch torque transmission failure zone bit.

Optionally, the system further comprises a rotational speed difference correction module, configured to:

taking the rotation speed difference between the engine rotation speed and the clutch driven disc rotation speed as an initial rotation speed difference;

correcting the initial rotation speed difference according to a rotation speed difference correction value to obtain a corrected rotation speed difference, wherein the rotation speed difference correction value is obtained according to the acceleration of the engine or the acceleration of a clutch driven disc, and the acceleration of the clutch driven disc is determined according to the rotation speed of the clutch driven disc;

and if the corrected rotation speed difference is not less than a preset first calibration threshold value, determining the corrected rotation speed difference as the clutch slip rotation speed difference.

Optionally, the clutch sliding friction work calculation module includes an engine inertia torque calculation unit, a clutch sliding friction torque calculation unit, and a clutch sliding friction work calculation unit;

the engine inertia torque calculation unit is used for determining the engine inertia torque according to the engine acceleration and the rotational inertia of the transmitter;

the clutch sliding friction torque calculation unit is used for determining clutch sliding friction torque according to the engine torque and the engine inertia torque;

and the clutch sliding friction work calculation unit is used for determining the clutch sliding friction work according to the difference between the clutch sliding friction torque and the clutch sliding friction rotating speed when the clutch torque transmission failure zone bit is a preset value.

Optionally, the clutch sliding friction work calculating unit is specifically configured to:

taking the product of the clutch friction torque and the clutch friction rotating speed difference as the friction power of the current monitoring period, and determining the friction heat of the current monitoring period;

determining the heat dissipation capacity of the current monitoring period according to the heat dissipation power, wherein the heat dissipation power is obtained by searching according to the rotating speed of the engine and the sliding friction heat as indexes;

and determining the difference value of the heat quantity of the current monitoring period and the heat dissipation quantity of the current monitoring period as the clutch sliding friction work.

Optionally, after determining the clutch slip work, the clutch slip work calculation module further includes a reset unit, configured to:

and when the timing time of the monitoring period is greater than a preset time threshold value, resetting the clutch sliding friction power to a preset calibration value.

Optionally, the clutch torque transmission failure flag module is specifically configured to:

and if the rotation angle difference is larger than a preset second calibration threshold value, determining that the clutch is not completely engaged, and setting the torque transmission failure zone bit of the clutch to be a preset value under the condition that the clutch is not completely engaged.

Optionally, the dry clutch further includes an alarm module, configured to:

if the sliding friction work of the clutch is larger than the heat threshold value, sending alarm information; or

And determining the heat level corresponding to the clutch sliding friction work according to the preset heat value interval of the clutch sliding friction work, and adopting a control strategy matched with the heat level.

In a third aspect, embodiments of the present application provide a computer-readable storage medium storing computer-executable instructions for causing a computer to perform a dry clutch slip work monitoring method provided by embodiments of the present application.

In the embodiment of the application, the slip friction rotation speed difference of the clutch determined by the rotation speed of the engine and the rotation speed of the clutch driven disc is integrated to obtain the rotation angle difference of the clutch driven disc and the clutch driven disc, and then the torque transmission failure flag bit of the clutch is set according to the rotation angle difference to provide a judgment basis for an overheat protection strategy of the clutch, so that the accuracy of the slip friction identification of the clutch is improved relative to the rotation speed difference of the clutch driven disc and the clutch driven disc; and further, clutch sliding friction work is determined according to the acceleration determined by the engine speed, the engine torque, the rotational inertia of the transmitter, the clutch sliding friction rotational speed difference and the clutch torque transmission failure zone bit, so that corresponding protective measures are taken based on the clutch sliding friction work, clutch burning caused by overhigh temperature of the clutch is prevented, and the service life of the clutch is prolonged.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a flow chart illustrating a method for monitoring dry clutch slip work according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram illustrating a method for correcting a rotational speed difference between a master plate and a slave plate of a clutch according to an embodiment of the present application;

FIG. 3 is a flow chart illustrating a method for determining clutch slip work provided by an embodiment of the present application;

FIG. 4 is a schematic diagram illustrating a method for determining clutch slip work according to an embodiment of the present disclosure;

FIG. 5 is a functional block diagram illustrating a dry clutch provided by an embodiment of the present application;

fig. 6 is a hardware block diagram schematically illustrating a dry clutch provided in an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

All other embodiments, which can be derived by a person skilled in the art from the exemplary embodiments shown in the present application without inventive effort, shall fall within the scope of protection of the present application. Moreover, while the disclosure herein has been presented in terms of exemplary one or more examples, it is to be understood that each aspect of the disclosure can be utilized independently and separately from other aspects of the disclosure to provide a complete disclosure.

Furthermore, the terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a product or device that comprises a list of elements is not necessarily limited to those elements explicitly listed, but may include other elements not expressly listed or inherent to such product or device.

The embodiment of the application provides a method and equipment for monitoring the slipping work of a dry clutch, mainly solving the problem that misjudgment is possibly caused by judging the slipping of the clutch by depending on the difference between the rotating speed of an engine and the rotating speed of an input shaft of a gearbox, and simultaneously solving the problem that the clutch is abraded due to the accumulated slipping heat caused by semi-linkage and/or incomplete clutch engagement.

In order to clearly describe the embodiments of the present application, terms in the embodiments of the present application will be explained below.

Sliding friction of the clutch: there is relative motion between the driving and driven discs of the clutch and a slip torque.

Clutch slip power: the heat power generated between the driving disc and the driven disc of the clutch due to sliding friction.

Clutch sliding friction: heat generated between the driving disk and the driven disk of the clutch due to friction.

Embodiments of the present application are described in detail below with reference to the accompanying drawings.

FIG. 1 is a flow chart illustrating a method for monitoring dry clutch slip work according to an embodiment of the present disclosure; as shown in fig. 1, the process can be implemented by a dry clutch, and mainly includes the following steps:

s101: and acquiring the rotating speed of the engine, the torque of the engine, the rotational inertia of the transmitter and the rotating speed of a clutch driven disc according to a preset monitoring period.

In S101, the engine speed may represent a clutch driving disk speed, and the clutch driven disk speed may be represented by a transmission input shaft speed. The size of the monitoring period can be set according to actual requirements. Alternatively, the start and end of the monitoring period may be set by a timer. Wherein, the rotational inertia of the engine can be obtained by pre-calibration.

S102: an engine acceleration is determined based on the engine speed, and a clutch slip speed differential is determined based on the engine speed and the clutch driven plate speed.

In S102, engine acceleration is determined by monitoring the engine speed at any two times acquired during the cycle.

For example, the engine speed at time t1 is denoted as v1, the engine speed at time t2 is denoted as v2, and the engine acceleration is a ═ v2-v 1)/t.

In S102, during the clutch operation, the transmission system automatically learns the acceleration of the engine or the acceleration of the clutch driven disc (determined according to the rotational speeds of the clutch driven disc at any two times acquired in the monitoring period, and the determined manner of the acceleration of the transmitter), so as to obtain a rotational Speed difference correction value for correcting the rotational Speed difference between the clutch driving disc and the clutch driven disc, which is denoted as CURVE _ Diff _ Speed, and correct the actually obtained rotational Speed difference based on the CURVE _ Diff _ Speed, thereby improving the accuracy of the slip recognition.

Referring to fig. 2, as shown in fig. 2, according to the obtained engine speed and the clutch driven plate speed, an initial speed difference v0 between the engine speed and the clutch driven plate speed may be determined, the initial speed difference is corrected according to a speed difference correction value to obtain a corrected speed difference, the corrected speed difference is compared with a preset first calibration threshold, if the corrected speed difference is less than the first calibration threshold C0, the corrected speed difference is recorded as 0, which indicates that the clutch and the transmission are completely engaged, otherwise, the corrected speed difference is determined as a clutch slip speed difference, which indicates that the clutch and the transmission are not completely engaged, which may generate a slip heat quantity.

S103: and integrating the sliding friction rotation speed difference of the clutch to obtain the rotation angle difference of the master driving disc and the slave driving disc of the clutch, and determining the torque transmission failure zone bit of the clutch according to the rotation angle difference.

In S103, the slip rotating speed difference of the clutch is integrated to obtain the rotating angle difference of the main driving disk and the auxiliary driving disk of the clutch, thereby reducing the influence of the instantaneous slip rotating speed difference of the clutch on the slip and improving the accuracy of the clutch engagement and the slip torque judgment. After the Rotation Angle difference is obtained, the Rotation Angle difference is compared with a preset second calibration threshold value (marked as Angle _ Diff _ Rotation), if the Rotation Angle difference is larger than the Angle _ Diff _ Rotation, the fact that the clutch is not completely engaged (namely the clutch generates the slip friction) is determined, and under the condition that the clutch is not completely engaged, a clutch torque transmission failure flag bit is set to be a preset value. Optionally, the preset value is a value other than 0. The values of the clutch torque transmission failure zone bits corresponding to different engagement points are different. For example, at a position where the clutch is 20% engaged with the transmission, the clutch torque transmission failure flag is set to 7, and at a position where the clutch is 30% engaged with the transmission, the clutch torque transmission failure flag is set to 6. In the case where the clutch is fully engaged, the clutch torque transmission failure flag is set to 0.

Wherein the clutch torque transfer failure flag may be used to self-correct a preset clutch engagement point (e.g., minimum engagement point). For example, the minimum engagement point of the clutch with the transmission is preset based on empirical values, which deviate from the engagement point measured from actual data, and the minimum engagement point can be corrected based on the value of the clutch torque transmission failure flag.

S104: and determining the clutch sliding friction work according to the engine acceleration, the engine torque, the rotational inertia of the transmitter, the clutch sliding friction and rotation speed difference and the clutch torque transmission failure zone bit.

In S104, the clutch slip torque can be determined by the engine acceleration, the engine torque and the rotational inertia of the transmitter, and then the clutch slip work can be determined by combining the clutch slip rotational speed difference.

The specific determination process of the clutch sliding friction work is shown in fig. 3:

s1041: and determining the inertia torque of the engine according to the acceleration of the engine and the rotational inertia of the transmitter.

In S1041, the rotational inertia of the transmitter is a structural characteristic parameter, which can be obtained by calculation.

S1042: a clutch slip torque is determined based on the engine torque and the engine inertia torque.

In S1042, the calculation formula of the clutch slip torque is as follows:

T_ice-T_clutch＝J_ice*a

wherein, T_iceRepresenting engine torque, T_clutchRepresenting clutch slip torque, J_iceRepresenting the transmitter moment of inertia and a representing the engine acceleration.

S1043: and when the torque transmission failure zone bit of the clutch is a preset value, determining the sliding friction work of the clutch according to the difference between the sliding friction torque of the clutch and the sliding friction rotating speed of the clutch.

In S1043, when the clutch torque transmission failure flag is not 0, it indicates that the clutch and the transmission are not completely engaged, and a slip heat amount is generated, and it is necessary to determine a slip work of the clutch.

Referring to fig. 4, as shown in fig. 4, the product of the clutch slip torque and the clutch slip rotation speed difference is used as the slip power of the current monitoring period, the slip power is integrated (denoted by: "in fig. 4), and the slip heat Q of the current monitoring period is determined; the engine speed and the sliding friction heat are used as indexes to search a preset mapping table to obtain the heat dissipation power MAP, the mapping table records the corresponding relation among the engine speed, the sliding friction heat and the heat dissipation power, and the heat dissipation power is obtained by calculation according to the structures, the heat capacities and the heat conductivities of the flywheel and the pressure plate. Further, based on the obtained heat dissipation power, the heat dissipation quantity Q of the current monitoring period is determined_MAPThe heat quantity Q of the current monitoring period and the heat dissipation quantity Q of the current monitoring period are compared_MAPThe difference of (a) is determined as the clutch slip work.

Optionally, the embodiment of the present application further provides a clutch sliding friction power reset function, which is implemented by a logic timer. Specifically, when the timing time of the monitoring period is greater than a preset time threshold, the clutch sliding friction power is reset to a preset calibration value, so that the accumulated error of the clutch sliding friction power in a plurality of monitoring periods is reduced, and the accuracy of calculation of the clutch sliding friction power is provided.

After the clutch sliding friction work is determined, corresponding measures are taken to protect the clutch from being burnt on the basis of the size of the clutch sliding friction work.

In an alternative embodiment, the clutch slip work is compared to a thermal threshold value, and if the clutch slip work is greater than the thermal threshold value, an alarm message is sent. Based on the alarm information, the heat generated by the sliding friction is reduced. For example, the engine speed is reduced.

In another optional implementation manner, different heat value intervals are preset, and the heat level corresponding to each interval is different, for example, the larger the value of the heat interval is, the higher the corresponding heat level is, and the higher the possibility of clutch plate burning is. After the sliding friction work of the clutch is obtained, a preset heat value interval in which the sliding friction work of the clutch is located is determined, a heat level corresponding to the sliding friction work of the clutch is determined according to the preset heat value interval in which the sliding friction work of the clutch is located, and a control strategy matched with the heat level is adopted, so that the clutch is protected from being burnt.

For example, if the clutch sliding friction work Q1 is located in the heat value range [ X1, Y1], and the corresponding heat level is 1 level, the sliding friction heat can be reduced by reducing the rotating speed of the transmitter; the sliding friction work Q2 of the clutch is positioned in a heat value range [ X2, Y2], the corresponding heat level is 2, and the sliding friction heat can be reduced by closing the clutch.

In the above embodiment of the application, on one hand, the rotation angle difference between the clutch main driving disc and the clutch secondary driving disc is obtained by integrating the rotation speed difference between the clutch main driving disc and the clutch secondary driving disc, and whether the clutch is completely engaged is determined based on the comparison between the rotation angle difference and the second calibration threshold value, if the clutch is not completely engaged, the slip friction heat is generated, and then the clutch torque transmission failure flag is determined, and whether the clutch is slip friction is generated is identified based on the rotation speed difference, so that the misjudgment caused by the torsion reason of the torsion damper is avoided; on the other hand, when the clutch is not completely engaged with the transmission equipment, the sliding friction power is determined according to the sliding friction torque of the clutch and the sliding friction rotating speed difference of the clutch, the sliding friction power is integrated to obtain the sliding friction heat, the heat dissipated by the heat dissipation power is subtracted to obtain the sliding friction power of the clutch, and the sliding friction power of the clutch is determined relative to the temperature value and the sliding friction time measured by the temperature sensor.

Based on the same technical concept, the embodiment of the application provides a dry clutch, which can realize the method for monitoring the sliding friction work provided by the embodiment of the application and achieve the same technical effect.

Referring to fig. 5, the dry clutch includes an acquisition module 501, an engine acceleration calculation module 502, a slip speed difference calculation module 503, a speed difference integration module 504, a clutch torque transfer failure flag module 505, a clutch slip work calculation module 506;

the acquiring module 501 is configured to acquire an engine rotation speed, an engine torque, a transmitter rotational inertia, and a clutch driven disc rotation speed according to a preset monitoring period;

an engine acceleration calculation module 502 for determining engine acceleration from engine speed;

a slip and friction rotation speed difference calculation module 503, configured to determine a clutch slip and friction rotation speed difference according to the engine rotation speed and the clutch driven disc rotation speed;

a rotation speed difference integration module 504, configured to integrate the clutch sliding rotation speed difference to obtain a rotation angle difference between the clutch driving disk and the clutch driven disk;

a clutch torque transmission failure flag module 505, configured to determine a clutch torque transmission failure flag according to the rotation angle difference;

and a clutch slip work calculation module 506, configured to determine the clutch slip work according to the engine acceleration, the engine torque, the rotational inertia of the transmitter, the clutch slip rotational speed difference, and the clutch torque transmission failure flag.

Optionally, the dry clutch further comprises a differential rotation speed correction module 507, configured to:

taking the rotation speed difference between the rotation speed of the engine and the rotation speed of the clutch driven disc as an initial rotation speed difference;

correcting the initial rotation speed difference according to the rotation speed difference correction value to obtain a corrected rotation speed difference, wherein the rotation speed difference correction value is obtained according to the acceleration of an engine or the acceleration of a clutch driven disc, and the acceleration of the clutch driven disc is determined according to the rotation speed of the clutch driven disc;

and if the corrected rotation speed difference is not less than a preset first calibration threshold value, determining the corrected rotation speed difference as the clutch slip rotation speed difference.

Optionally, the clutch slip work calculation module 506 includes an engine inertia torque calculation unit 5061, a clutch slip torque calculation unit 5062, a clutch slip work calculation unit 5063;

an engine inertia torque calculation unit 5061, configured to determine an engine inertia torque according to an engine acceleration and a transmitter rotational inertia;

a clutch slip torque calculation unit 5062 for determining a clutch slip torque based on the engine torque and the engine inertia torque;

and the clutch sliding friction work calculation unit 5063 is used for determining the clutch sliding friction work according to the difference between the clutch sliding friction torque and the clutch sliding friction rotating speed when the clutch torque transmission failure flag bit is a preset value.

Optionally, the clutch sliding friction calculation unit 5063 is specifically configured to:

taking the product of the clutch friction torque and the clutch friction rotating speed difference as the friction power of the current monitoring period, and determining the friction heat of the current monitoring period;

determining the heat dissipation capacity of the current monitoring period according to the heat dissipation power, wherein the heat dissipation power is obtained by taking the rotating speed of the engine and the sliding friction heat as indexes for searching;

and determining the difference value of the heat quantity of the current monitoring period and the heat dissipation quantity of the current monitoring period as the clutch sliding friction work.

Optionally, the clutch friction calculation module 506 further comprises a reset unit 5064 for:

and when the timing time of the monitoring period is greater than a preset time threshold value, resetting the sliding friction power of the clutch to a preset calibration value.

Optionally, the clutch torque transfer failure flag module 505 is specifically configured to:

and if the rotation angle difference is larger than a preset second calibration threshold value, determining that the clutch is not completely engaged, and setting a clutch torque transmission failure flag bit as a preset value under the condition that the clutch is not completely engaged.

Optionally, the dry clutch further comprises an alarm module 508 for:

if the sliding friction work of the clutch is larger than the heat threshold value, sending alarm information; or

And determining the heat level corresponding to the clutch sliding friction work according to the preset heat value interval of the clutch sliding friction work, and adopting a control strategy matched with the heat level.

Based on the same technical concept, the embodiment of the application provides a dry clutch, and the dry clutch can realize the slip friction work monitoring method in the embodiment.

Referring to fig. 6, the dry clutch includes a processor 601. The processor 601 may also be a controller. The processor 601 is configured to perform the functions referred to in fig. 1 and 3. The dry clutch may also include a memory 602, the memory 602 for coupling with the processor 601, which retains program instructions and data necessary for the dry clutch. Wherein, the processor 601 and the memory 602 are connected by a bus, the memory 602 is used for storing computer executable instructions, and the processor 601 is used for executing the instructions stored in the memory 602 to complete the steps of the corresponding functions of the above method.

In the embodiment of the present application, for the concept, explanation, detailed description and other steps related to the dry clutch and related to the technical solution provided in the embodiment of the present application, reference is made to the foregoing method or descriptions related to these contents in other embodiments, which are not described herein again.

It should be noted that the processor referred to in the embodiments of the present application may be a Central Processing Unit (CPU), a general purpose processor, a Digital Signal Processor (DSP), an application-specific integrated circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic devices, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. A processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, a DSP and a microprocessor, or the like. Wherein the memory may be integrated in the processor or may be provided separately from the processor.

It should be noted that fig. 6 only shows the necessary hardware required for implementing the method for monitoring the sliding friction work provided by the embodiment of the present application, and other hardware structures for the dry clutch are not shown, but include other conventional hardware.

The embodiment of the present application further provides a computer-readable storage medium, where computer-executable instructions are stored, and the computer-executable instructions are used to enable a computer to execute the method in the foregoing embodiment.

The embodiments of the present application also provide a computer program product for storing a computer program, where the computer program is used to execute the method of the foregoing embodiments.

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

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

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

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

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.