A method, system, device and storage medium for calculating starting sliding friction work

Abstract

The present invention relates to a method, system, device and storage medium for calculating starting slipping work. The present application determines the start of starting slipping by using a booster cylinder position sensor signal. After the start of starting slipping, the engine output shaft speed, the gearbox input shaft speed and the booster cylinder stroke are recorded at set time intervals; the end of starting slipping is determined by the same engine output shaft speed and gearbox input shaft speed; the dry clutch starting slipping work is obtained by using the engine output shaft speed, gearbox input shaft speed and booster cylinder stroke data recorded between the start and the end of starting slipping, wherein when calculating the dry clutch starting slipping work, the clutch friction torque at each unit time point is calculated based on the booster cylinder stroke recorded per the time interval. The present application replaces the existing calculation method of approximating the engine torque by calculating the clutch friction torque, so that the calculation of the dry clutch starting slipping work is more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of clutch starting slippage work calculation, and in particular to a starting slippage work calculation method, system, device and storage medium. Background Art

[0002] The clutch is directly connected to the engine and is responsible for the disconnection and connection of the power and transmission system. It is an important component of the automobile transmission system.

[0003] During the clutch control disconnection and engagement process, slippage will inevitably occur between the driven plate and the active plate of the clutch, causing the clutch temperature to rise and causing friction plate burning. Especially in high-gear and heavy-load starting, multiple consecutive starts in congested road conditions, and slow single start operations, it is very easy to cause an increase in clutch starting slippage work. Accurate monitoring and calculation of clutch starting slippage work is an important process for monitoring the clutch state. In the clutch starting slippage work calculation method used in the industry, the engine output torque is usually used to approximate the clutch friction torque during the starting process. Since the gap between the engine output torque and the clutch transmission friction torque is relatively large at the beginning of the start, the calculated starting slippage work is too large, resulting in the monitored clutch state not being consistent with the actual clutch state. Summary of the invention

[0004] In order to solve the above technical problem or at least partially solve the above technical problem, the present invention provides a method, system, device and storage medium for calculating the starting sliding friction work.

[0005] In a first aspect, the present invention provides a method for calculating starting slippage work, comprising: determining the start of starting slippage through a power cylinder position sensor signal, and after the start of starting slippage, recording the engine output shaft speed, the gearbox input shaft speed and the power cylinder stroke at set time intervals; judging the end of starting slippage by the engine output shaft speed being the same as the gearbox input shaft speed; obtaining the starting slippage work of a dry clutch using the engine output shaft speed, the gearbox input shaft speed and the power cylinder stroke data recorded between the start and the end of starting slippage, wherein, when calculating the starting slippage work of the dry clutch, the clutch friction torque at each unit time point is calculated based on the power cylinder stroke recorded per the unit time interval.

[0006] Furthermore, the step of determining the start of sliding friction by using the booster cylinder position sensor signal includes:

[0007] After the vehicle is powered on, the vehicle speed sensor, gear position signal and power cylinder position sensor information are read. When the vehicle speed sensor signal is 0, the gear position signal changes from neutral to in gear, and the power cylinder position sensor signal begins to decrease, it is judged to be in a starting state. In the starting state, the power cylinder position sensor signal is monitored and compared with the set threshold. If the power cylinder position sensor signal is less than the threshold, it is judged that the starting slippage has started.

[0008] Furthermore, the starting friction work is obtained by using the engine output shaft speed, the gearbox input shaft speed and the booster cylinder stroke data recorded between the start and the end of the friction start, including:

[0009] Calculate the friction angle within the time interval based on the engine output shaft speed and the gearbox input shaft speed recorded within the time interval;

[0010] Calculating the clutch friction torque at each unit time point based on the booster cylinder stroke recorded at the unit time interval;

[0011] Calculating the sliding work within the time interval by using the sliding angle within the time interval and the friction torque of the clutch at each time point;

[0012] The dry clutch starting slip work is obtained by accumulating the slip work in the unit time interval from the start of the starting slip to the end of the starting slip.

[0013] Furthermore, the speed difference between the speed of the engine output shaft and the speed of the gearbox input shaft is calculated, and the speed difference is multiplied by the unit time interval to obtain the slip angle within the unit time interval.

[0014] Furthermore, the calculation of the clutch friction torque at each unit time point based on the booster cylinder stroke recorded per unit time interval includes:

[0015] Calculate the dry clutch separation stroke per unit time point by the booster cylinder stroke and the clutch transmission lever ratio within the unit time interval;

[0016] The clutch pressing force per unit time point is obtained by a preset clutch pressing force-dry clutch separation stroke curve;

[0017] The clutch pressing force is multiplied by the clutch driven plate friction coefficient to obtain the friction force, and the friction force is multiplied by the product of the clutch average friction radius and the number of friction surfaces to obtain the clutch friction torque per unit time point.

[0018] Furthermore, the calculation formula of the average friction radius of the clutch is:

[0019]

[0020] Among them, R c is the average friction radius of the clutch, R0 is the outer radius of the friction surface, and R1 is the inner radius of the friction surface.

[0021] Furthermore, the clutch friction torque per unit time point is approximated as the average friction torque per unit time interval, and the friction work per unit time interval is obtained by multiplying the clutch friction force per unit time point by the sliding angle per unit time interval.

[0022] In a second aspect, the present invention provides a dry clutch starting slippage work calculation system, comprising: a starting slippage stage determination module, the starting slippage stage determination module determines the start of starting slippage according to a booster cylinder position sensor signal, the starting slippage stage determination module determines the end of starting slippage according to the consistency of the engine output shaft speed and the gearbox input shaft speed;

[0023] A data recording module, which records the engine output shaft speed, the gearbox input shaft speed and the booster cylinder stroke at set time intervals during the starting sliding stage;

[0024] A configuration module, wherein the configuration of the configuration module includes: a transmission lever ratio, a clutch clamping force-dry clutch release stroke curve, a clutch driven disc friction coefficient, a number of friction surfaces, an outer radius of a friction surface, and an inner radius of a friction surface;

[0025] A calculation module is provided, wherein the calculation module calculates the starting slipping work of the dry clutch using the engine output shaft speed, the gearbox input shaft speed and the booster cylinder stroke collected by the data recording module and the transmission lever ratio, the clutch clamping force-dry clutch release stroke curve, the clutch driven plate friction coefficient, the number of friction surfaces, the outer circle radius of the friction surface and the inner circle radius of the friction surface configured by the configuration module.

[0026] In a third aspect, the present invention provides a dry clutch starting slip work calculation device, comprising: at least one processing unit, a storage unit and a bus unit, the bus unit connecting the storage unit and the processing unit, the storage unit storing a computer program, and the processing unit reading and executing the computer program to implement the starting slip work calculation method.

[0027] In a fourth aspect, the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for calculating the starting friction work is implemented.

[0028] The above technical solution provided by the embodiment of the present invention has the following advantages compared with the prior art:

[0029] The present invention determines the start of starting slippage through a booster cylinder position sensor signal. After the start of starting slippage, the engine output shaft speed, the gearbox input shaft speed and the booster cylinder stroke are recorded at set time intervals; the end of starting slippage is determined by the engine output shaft speed being the same as the gearbox input shaft speed; the dry clutch starting slippage work is obtained by using the engine output shaft speed, the gearbox input shaft speed and the booster cylinder stroke data recorded between the start and the end of starting slippage, and the clutch friction torque at each unit time point is calculated based on the booster cylinder stroke recorded per the time interval, rather than using the engine torque as a proxy for the clutch friction torque, so that the calculated dry clutch starting slippage work is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0032] Figure 1 A flowchart of a method for calculating starting sliding friction work provided by an embodiment of the present invention;

[0033] Figure 2 A flow chart of obtaining the starting friction work by using the engine output shaft speed, the gearbox input shaft speed and the booster cylinder stroke data recorded between the start and the end of the starting friction provided by an embodiment of the present invention;

[0034] Figure 3 A flow chart of calculating the clutch friction torque at each unit time point based on the booster cylinder stroke recorded at the unit time interval provided by an embodiment of the present invention;

[0035] Figure 4 A schematic diagram of a dry clutch starting friction work calculation system provided by an embodiment of the present invention;

[0036] Figure 5 A schematic diagram of a dry clutch starting slip work calculation device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0039] Example 1

[0040] An embodiment of the present invention provides a method for calculating starting sliding friction work, comprising:

[0041] S100, determining the start of sliding friction through the power cylinder position sensor signal.

[0042] During the specific implementation process, the vehicle speed sensor, gear signal and power cylinder position sensor information are read after the vehicle is powered on. When the vehicle speed sensor signal is 0, the gear signal changes from neutral to in gear, and the power cylinder position sensor signal begins to decrease, it is judged to be in a starting state. In the starting state, the power cylinder position sensor signal is monitored in real time, and compared to see whether the power cylinder position sensor signal is less than a set threshold. If the power cylinder position sensor signal is less than the threshold, it is judged that starting slippage has started.

[0043] S200, after the start of sliding friction, record the engine output shaft speed ω at set time intervals e 、Gearbox input shaft speedω c And the booster cylinder stroke l, until the starting slip ends.

[0044] During the specific implementation process, the engine output shaft speed ω is recorded every 0.02s. e 、Gearbox input shaft speedω c And booster cylinder stroke l. Analyze the recorded engine output shaft speed ω e and the gearbox input shaft speed ω c Are they the same? If they are the same, it is determined that the starting sliding is over.

[0045] S300, using the engine output shaft speed ω recorded between the start and the end of the sliding friction e 、Gearbox input shaft speedω c The dry clutch starting slipping power is obtained by using the booster cylinder stroke l data.

[0046] During the specific implementation process, see Figure 2 As shown, the starting friction work obtained by using the engine output shaft speed, the gearbox input shaft speed and the booster cylinder stroke data recorded between the start and the end of the friction start includes:

[0047] S310, based on the engine output shaft speed ω recorded at the time interval of the unit e 、Gearbox input shaft speedω e , calculate the sliding angle Δθ within the time interval; specifically, calculate the engine output shaft speed ω e and the gearbox input shaft speed ω e The speed difference is multiplied by the unit time interval Δt to obtain the sliding friction angle Δθ within the unit time interval:

[0048] Δθ=(ω e -ω c )Δt.

[0049] S320, calculating the clutch friction torque at each unit time point based on the booster cylinder stroke recorded per unit time interval.

[0050] During the specific implementation process, see Figure 3 As shown, the calculation of the clutch friction torque at each unit time point based on the booster cylinder stroke recorded at the unit time interval includes:

[0051] S321, calculating the dry clutch separation stroke l' at a unit time point by the booster cylinder stroke l and the clutch transmission lever ratio within the unit time interval;

[0052] S322, obtaining the clutch pressing force F at a unit time point through a preset clutch pressing force-dry clutch release stroke curve;

[0053] S323, the clutch clamping force is multiplied by the friction coefficient of the clutch driven plate to obtain the friction force, and the friction force is multiplied by the product of the clutch average friction radius and the number of friction surfaces to obtain the clutch friction torque per unit time point:

[0054] T c =μFnR c , where μ is the friction coefficient of the clutch driven disc, n is the number of friction surfaces, R c is the average friction radius of the clutch.

[0055] The calculation formula of the average friction radius of the clutch is:

[0056]

[0057] Among them, R0 is the outer radius of the friction surface, and R1 is the inner radius of the friction surface.

[0058] S330, calculating the friction work within the time interval using the friction angle within the time interval and the friction torque of the clutch at each time point. Specifically, the friction torque of the clutch at the time point is approximated as the average friction torque within the time interval, and the friction force of the clutch at the time point is multiplied by the friction angle within the time interval to obtain the friction work within the time interval:

[0059] W i =T ci ·Δθ i .

[0060] S340, accumulating the sliding work in the unit time interval from the start of the starting sliding to the end of the starting sliding to obtain the starting sliding work of the dry clutch:

[0061] I is the number of time intervals in the starting sliding phase.

[0062] Example 2

[0063] See also Figure 4 As shown, the present invention provides a dry clutch starting slip work calculation system, comprising:

[0064] a starting slipping friction phase determination module, wherein the starting slipping friction phase determination module determines the start of the starting slipping friction according to the booster cylinder position sensor signal, and determines the end of the starting slipping friction according to the consistency of the engine output shaft speed and the gearbox input shaft speed;

[0065] A data recording module, which records the engine output shaft speed, the gearbox input shaft speed and the booster cylinder stroke at set time intervals during the starting sliding stage;

[0066] A configuration module, wherein the configuration of the configuration module includes: a transmission lever ratio, a clutch clamping force-dry clutch release stroke curve, a clutch driven disc friction coefficient, a number of friction surfaces, an outer radius of a friction surface, and an inner radius of a friction surface;

[0067] A calculation module is provided, wherein the calculation module calculates the starting slipping work of the dry clutch using the engine output shaft speed, the gearbox input shaft speed and the booster cylinder stroke collected by the data recording module and the transmission lever ratio, the clutch clamping force-dry clutch release stroke curve, the clutch driven plate friction coefficient, the number of friction surfaces, the outer circle radius of the friction surface and the inner circle radius of the friction surface configured by the configuration module.

[0068] Example 3

[0069] See also Figure 5 As shown, an embodiment of the present invention provides a dry clutch starting slippage work calculation device, comprising at least one processing unit, a storage unit and a bus unit, wherein the bus unit connects the storage unit and the processing unit, the storage unit stores a computer program, and the processing unit reads and executes the computer program to implement the starting slippage work calculation method, wherein the method comprises: determining the start of starting slippage by the booster cylinder position sensor signal, recording the engine output shaft speed, the gearbox input shaft speed and the booster cylinder stroke at set time intervals after the start of starting slippage; judging the end of starting slippage by the same engine output shaft speed and gearbox input shaft speed; obtaining the dry clutch starting slippage work by using the engine output shaft speed, gearbox input shaft speed and booster cylinder stroke data recorded between the start and end of starting slippage. Of course, the operation implemented by the dry clutch starting slippage work calculation device provided by the embodiment of the present invention is not limited to the method described above, and the related operations in the starting slippage work calculation method provided by any embodiment of the present invention can also be performed.

[0070] In addition, the storage unit may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. The bus unit includes but is not limited to a CAN bus.

[0071] Example 4

[0072] An embodiment of the present invention provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the method for calculating the starting slipping work is implemented. The method includes: determining the start of the starting slipping through a signal from a power cylinder position sensor, and after the start of the starting slipping, recording the engine output shaft speed, the gearbox input shaft speed and the power cylinder stroke at set time intervals; judging the end of the starting slipping by the engine output shaft speed being the same as the gearbox input shaft speed; and obtaining the starting slipping work of the dry clutch using the engine output shaft speed, the gearbox input shaft speed and the power cylinder stroke data recorded between the start and the end of the starting slipping.

[0073] Of course, the computer program stored in the computer-readable storage medium provided in the embodiment of the present invention is not limited to the method described above, and can also execute the related operations in the starting friction work calculation method provided in any embodiment of the present invention.

[0074] In the embodiments provided by the present invention, it should be understood that the disclosed structures and methods can be implemented in other ways. For example, the structural embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, structures or units, which can be electrical, mechanical or other forms.

[0075] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0076] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0077] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for calculating starting sliding friction work, characterized in that: include: The start of slipping friction is determined by the signal of the booster cylinder position sensor. After the start of slipping friction, the engine output shaft speed, the gearbox input shaft speed and the booster cylinder stroke are recorded at set time intervals; the end of slipping friction is determined when the engine output shaft speed and the gearbox input shaft speed are the same; The dry clutch starting slipping work is obtained by using the engine output shaft speed, gearbox input shaft speed and booster cylinder stroke data recorded between the start and the end of the starting slipping, including: calculating the slip angle within the unit time interval based on the engine output shaft speed and gearbox input shaft speed recorded in the unit time interval; calculating the clutch friction torque at each unit time point based on the booster cylinder stroke recorded in the unit time interval, including: calculating the dry clutch separation stroke at the unit time point through the booster cylinder stroke and the transmission lever ratio of the clutch within the unit time interval, obtaining the clutch pressing force at the unit time point through a preset clutch pressing force-dry clutch separation stroke curve, multiplying the clutch pressing force by the friction coefficient of the clutch driven plate to obtain the friction force, and multiplying the friction force by the product of the average friction radius of the clutch and the number of friction surfaces to obtain the clutch friction torque at the unit time point; calculating the slip work within the unit time interval by using the slip angle within the unit time interval and the clutch friction torque at each unit time point; accumulating the slip work within the unit time interval from the start of the starting slipping to the end of the starting slipping to obtain the dry clutch starting slipping work.

2. The method for calculating the starting friction work according to claim 1, characterized in that: Determining the start of sliding friction by using the boost cylinder position sensor signal includes: After the vehicle is powered on, the vehicle speed sensor, gear signal and power cylinder position sensor information are read. When the vehicle speed sensor signal is 0, the gear signal changes from neutral to in gear, and the power cylinder position sensor signal begins to decrease, it is judged to be in the starting state; in the starting state, the power cylinder position sensor signal is monitored and compared with the set threshold. If the power cylinder position sensor signal is less than the threshold, it is judged that the starting slippage has started.

3. The method for calculating the starting friction work according to claim 1, characterized in that: The speed difference between the engine output shaft speed and the gearbox input shaft speed is calculated, and the speed difference is multiplied by the unit time interval to obtain the slip angle within the unit time interval.

4. The method for calculating the starting friction work according to claim 1, characterized in that: The calculation formula of the average friction radius of the clutch is: in, is the average friction radius of the clutch, is the outer radius of the friction surface, is the inner radius of the friction surface.

5. The method for calculating the starting friction work according to claim 1, characterized in that: The clutch friction torque per unit time point is approximated as the average friction torque per unit time interval, and the clutch friction force per unit time point is multiplied by the sliding angle per unit time interval to obtain the sliding work per unit time interval.

6. A dry clutch starting friction work calculation system, characterized in that: include: a starting slipping friction phase determination module, wherein the starting slipping friction phase determination module determines the start of the starting slipping friction according to the booster cylinder position sensor signal, and determines the end of the starting slipping friction according to the consistency of the engine output shaft speed and the gearbox input shaft speed; A data recording module, which records the engine output shaft speed, the gearbox input shaft speed and the booster cylinder stroke at set time intervals during the starting sliding stage; A configuration module, wherein the configuration of the configuration module includes: a transmission lever ratio, a clutch clamping force-dry clutch release stroke curve, a clutch driven disc friction coefficient, a number of friction surfaces, an outer radius of a friction surface, and an inner radius of a friction surface; A calculation module, wherein the calculation module calculates the starting slip work of the dry clutch using the engine output shaft speed, the gearbox input shaft speed and the booster cylinder stroke collected by the data recording module and the transmission lever ratio, the clutch clamping force-dry clutch separation stroke curve, the clutch driven plate friction coefficient, the number of friction surfaces, the outer circle radius of the friction surface and the inner circle radius of the friction surface. The process includes: calculating the slip angle within the unit time interval based on the engine output shaft speed and the gearbox input shaft speed recorded at the unit time interval; calculating the clutch friction torque at each unit time point based on the booster cylinder stroke recorded at the unit time interval, including: calculating the starting slip work of the dry clutch using the booster cylinder stroke recorded at the unit time interval The dry clutch disengagement stroke at a unit time point is calculated based on the stroke and the transmission lever ratio of the clutch; the clutch pressing force at a unit time point is obtained by a preset clutch pressing force-dry clutch disengagement stroke curve; the clutch pressing force is multiplied by the friction coefficient of the clutch driven plate to obtain the friction force; the friction force is multiplied by the product of the average friction radius of the clutch and the number of friction surfaces to obtain the clutch friction torque at a unit time point; the sliding work within the unit time interval is calculated using the sliding angle within the unit time interval and the clutch friction torque at each unit time point; the sliding work within the unit time interval from the start of the starting slip to the end of the starting slip is accumulated to obtain the dry clutch starting slip work.

7. A dry clutch starting friction work calculation device, characterized in that: The method comprises at least one processing unit, a storage unit and a bus unit, wherein the bus unit connects the storage unit and the processing unit, the storage unit stores a computer program, and the processing unit reads and executes the computer program to implement the starting friction work calculation method as described in any one of claims 1 to 5.

8. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method for calculating the starting sliding friction work as claimed in any one of claims 1 to 5 is implemented.

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