Method and device for processing speed difference for clutch slip diagnosis, and electronic device

Abstract

The present application relates to a kind of rotational speed difference processing method, device and electronic equipment for clutch slip diagnosis, its method includes: determining signal acquisition error rotational speed difference range and signal microslip control rotational speed difference range, the greater value in signal acquisition error range and microslip rotational speed error range is as rotational speed difference reasonable range;Rotational speed difference input value in rotational speed difference reasonable range and outside rotational speed difference reasonable range is respectively filtered, and rotational speed difference output value is obtained;When rotational speed difference is switched between inside reasonable range and outside reasonable range, the rotational speed difference output value of current time is the rotational speed difference output value of last time, and the rotational speed difference output value of next time is equal to rotational speed difference input value of next time.The present application can exclude signal acquisition error, microslip control etc. Interference, and will not affect the judgment of rotational speed difference when serious slippage or slip occurs, so as to avoid clutch slip misdiagnosis, improve the accuracy of diagnosis.

Description

Technical Field

[0001] This invention relates to the field of clutch slippage diagnosis, and more specifically, to a method, apparatus, and electronic device for processing speed difference in clutch slippage diagnosis. Background Technology

[0002] The clutch is a common transmission component in automobiles. Through the engagement and disengagement of the clutch, power transmission and interruption are achieved. When the clutch is engaged, if a speed difference exists between the input and output ends, it indicates that slippage has occurred on the clutch friction surfaces. Moderate slight slippage can help reduce torque fluctuations on the power supply side, thus improving driving comfort. However, if the speed difference between the clutch ends is large, slippage will lead to a decrease and unevenness in output power. Furthermore, prolonged slippage can cause heat accumulation, leading to overheating and malfunction of the clutch hardware. Therefore, accurate and timely clutch slippage diagnosis is particularly important in clutch control.

[0003] In general clutch slippage diagnosis and control, the judgment of clutch slippage mainly relies on the magnitude of the speed difference between the two ends of the clutch after engagement. Chinese patent CN116792423A discloses a clutch slippage fault diagnosis method, which collects the original speed difference signal. However, in actual clutch control, errors in speed signal acquisition, the speed difference in normal micro-slippage control, and occasional invalid speed differences can all affect the magnitude of the original speed difference, leading to misdiagnosis of clutch slippage or jerking, causing the clutch to malfunction. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method, device and electronic device for processing speed difference for clutch slippage diagnosis, which can avoid misdiagnosis of clutch slippage and improve the accuracy of diagnosis.

[0005] The technical solution adopted by this invention to solve its technical problem is: constructing a speed difference processing method for clutch slippage diagnosis, wherein the speed difference is the speed difference between the clutch input end and the output end, including:

[0006] Determine the range of speed difference for signal acquisition error and the range of speed difference for signal micro-slip friction control. The larger value between the range of signal acquisition error and the range of speed error for micro-slip friction is taken as the reasonable range of speed difference.

[0007] The input values ​​of the speed difference within and outside the reasonable range are filtered to obtain the output value of the speed difference.

[0008] When the speed difference switches between two states, one within the reasonable range and the other outside the reasonable range, the speed difference output value at the current moment is the speed difference output value at the previous moment, and the speed difference output value at the next moment is equal to the speed difference input value at the next moment.

[0009] According to the above scheme, the methods for determining the range of signal acquisition error speed difference include:

[0010] With the clutch output end suspended, a fixed torque is input to the clutch output end. This fixed torque plus a safety value is used as the target torque for clutch engagement control to ensure that the clutch does not slip. The speed difference is tested for a period of time and used as the signal acquisition error range.

[0011] According to the above scheme, the methods for determining the speed difference range of signal micro-slip friction control include:

[0012] After the clutch is fully engaged, torque is input at the clutch input end to ensure torque transmission without slippage. The clutch temperature is tested, the clutch speed difference is increased, and the clutch temperature is maintained stable by adjusting the cooling system until the cooling system operating parameters exceed the threshold. The current clutch speed difference is recorded as the speed error range for micro-slippage control.

[0013] According to the above scheme, a low-pass filter is applied to the clutch speed difference input value using a discrete difference equation. The discrete difference equation is as follows:

[0014] Y(n)=k c *(X(n)-Y(n-1))+Y(n-1);

[0015] In the formula, k c X(n) is the filter coefficient, X(n) is the input value of the speed difference at the current time, Y(n-1) is the filter output value at the previous time, and Y(n) is the output value of the speed difference at the current time.

[0016] According to the above scheme, when the speed difference input value is within a reasonable range, k c =0.1~0.3; when the speed difference input value is outside the reasonable range, k c =0.7~0.9.

[0017] According to the above scheme, the method for handling speed difference also includes:

[0018] Identify instances where the speed difference occasionally jumps from a reasonable range to an unreasonable range, or from an unreasonable range to a reasonable range, and treat these as invalid interference values.

[0019] According to the above scheme, the method for identifying invalid interference values ​​is as follows:

[0020] like or

[0021] Then n t+1 This is an invalid interference value, where n t Let n be the clutch speed difference at time t. t+k Let n be the clutch speed difference during the k-th signal cycle after time t. lim This represents the extreme value within the reasonable range of clutch speed difference.

[0022] The present invention also provides a speed difference processing device for clutch slippage diagnosis, wherein the speed difference is the speed difference between the clutch input end and the output end, comprising:

[0023] The module for obtaining the reasonable range of speed difference is used to determine the speed difference range of signal acquisition error and the speed difference range of signal micro-slip friction control. The larger value between the signal acquisition error range and the micro-slip friction speed error range is taken as the reasonable range of speed difference.

[0024] The filtering module is used to filter the input values ​​of the speed difference within the reasonable range and outside the reasonable range, respectively, to obtain the output value of the speed difference;

[0025] The state switching processing module switches between two states: when the speed difference is within a reasonable range and when it is outside a reasonable range. The current speed difference output value is the speed difference output value of the previous moment, and the speed difference output value of the next moment is equal to the speed difference input value of the next moment.

[0026] The present invention also provides an electronic device, comprising: a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; the memory stores a computer program, and when the program is executed by the processor, the processor performs the steps of the method.

[0027] The present invention also provides a computer-readable storage medium having executable instructions stored thereon, which, when executed by a processor, cause the processor to implement the steps of a method.

[0028] The speed difference processing method, apparatus, and electronic device for clutch slippage diagnosis of the present invention have the following beneficial effects:

[0029] 1. This invention eliminates interference from signal acquisition errors and micro-slip control by segmenting and filtering the speed difference and delaying initialization, and does not affect the judgment of excessive speed difference when severe slippage or slippage occurs, thereby avoiding misdiagnosis of clutch slippage and improving the accuracy of diagnosis.

[0030] 2. This invention determines a reasonable range for clutch speed difference. When filtering speed difference within the reasonable range, a smaller filtering coefficient is used, while a larger filtering coefficient is used for speed difference outside the reasonable range, thereby improving the judgment and response to speed difference caused by clutch slippage.

[0031] 3. This invention uses discrete difference equations to filter the speed difference uniformly. The speed difference processing effect is achieved simply by changing the filter coefficients. The implementation method is simple and clear and easy to apply in engineering. Attached Figure Description

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0033] Figure 1 This is a flowchart of the speed difference processing method for clutch slippage diagnosis according to the present invention;

[0034] Figure 2 This is a schematic diagram illustrating the handling of a single clutch speed difference when it is ineffective.

[0035] Figure 3 This is a schematic diagram of speed handling during normal clutch switching;

[0036] Figure 4 This is a flowchart of the filter coefficient calculation method;

[0037] Figure 5 This is a schematic diagram illustrating the processing effect during normal transition of clutch speed difference state;

[0038] Figure 6 This is a schematic diagram illustrating the processing effect when a single invalid value appears in the clutch speed difference. Detailed Implementation

[0039] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0040] Example 1

[0041] like Figure 1 As shown, in the speed difference processing method for clutch slippage diagnosis of the present invention, the speed difference is the speed difference between the clutch input end and the output end, and the speed difference processing includes:

[0042] S1. Determine the range of speed difference for signal acquisition error and the range of speed difference for signal micro-slip control. The larger value between the range of signal acquisition error and the range of speed error for micro-slip control shall be taken as the reasonable range of speed difference.

[0043] The method for determining the speed difference range of signal acquisition error is as follows: suspend the clutch output end, input a fixed torque at the clutch output end, add a certain safety value to this fixed torque as the clutch target torque for pressurization and engagement control, ensuring that the clutch does not slip at all. After the clutch speed reaches a stable state, test the speed value for a period of time; the speed range is the signal acquisition error range.

[0044] The principle for determining the speed difference range for micro-slip control is to eliminate the temperature difference caused by the micro-slip speed difference control, ensuring that the increase in the cooling system's workload is within a certain range. For example, for an oil-cooled motor system, the increase in speed should be within 20%. The method for determining the signal micro-slip control speed difference range is as follows: After the clutch is fully engaged, apply torque to the input end to ensure zero-slip torque transmission. Test the clutch temperature. Then, increase the clutch speed difference while simultaneously increasing the cooling motor speed to maintain a stable temperature until the cooling motor speed exceeds a preset value, for example, by 20%. Record the current clutch speed difference as the micro-slip control speed error range.

[0045] Preferably, this embodiment also provides the ability to identify situations where the speed difference occasionally jumps from a reasonable range to an unreasonable range, or from an unreasonable range to a reasonable range, and to regard such situations as invalid interference values.

[0046] A single invalid value for speed difference refers to a value where the speed difference occasionally jumps from a reasonable range to an unreasonable range, or occasionally jumps from an unreasonable range to a reasonable range. Such randomly generated interference values ​​need to be treated as invalid values.

[0047] The method for identifying invalid values ​​due to a single speed difference is as follows:

[0048] Define n t Let n be the original value of the clutch speed difference at time t. t+k Let n be the original value of the clutch speed difference in the kth signal cycle after time t. lim This represents the extreme value within the reasonable range of clutch speed difference.

[0049] if

[0050] or

[0051] So, n t+1 This is an invalid value for a single rotational speed.

[0052] S2. Filter the input values ​​of the speed difference within the reasonable range and outside the reasonable range of the speed difference to obtain the output value of the speed difference.

[0053] To facilitate implementation in engineering software, this embodiment uses a discrete difference equation to perform low-pass filtering on the original value of the clutch speed difference. The discrete difference equation is as follows:

[0054] Y(n)=k c *(X(n)-Y(n-1))+Y(n-1); (1)

[0055] k c X(n) is the filter coefficient, X(n) is the input value of the speed difference at the current time, Y(n-1) is the filter output value at the previous time, and Y(n) is the output value of the speed difference at the current time.

[0056] When the original speed difference is within a reasonable range, it is recommended to set a low filter coefficient k to reduce interference from speed differences within this range. c1 The recommended value range is 0.1 to 0.3. When the original speed difference is outside the reasonable range, in order to improve the system's efficiency in identifying clutch slippage, it is necessary to increase the filter output's response to the input. It is recommended to set a higher filter coefficient k. c2 The recommended value range is 0.7 to 0.9.

[0057] S3. When switching between the two states of speed difference within and outside the reasonable range, the speed difference output value at the current moment is the speed difference output value at the previous moment, and the speed difference output value at the next moment is equal to the speed difference input value at the next moment.

[0058] When the clutch speed difference is within a reasonable range, it is in a reasonable state; when it is outside the reasonable speed range, it is in an unreasonable state. At the moment of switching between the two states, since it is impossible to confirm whether it is caused by the invalidity of a single speed difference or just a normal state switch, the output at the moment of state switch still maintains the value of the previous moment, and the output is reset with the input value at the next moment, that is, the output value is equal to the input value, and is not affected by filtering.

[0059] Figure 2 and Figure 3 This diagram illustrates the processing of the speed difference output during clutch state switching. The solid line in the diagram represents the speed difference input n. in The dashed line represents the output n of the speed difference. out The dotted line represents the extreme value n within the reasonable range of the speed difference. lim .

[0060] The advantage of this approach is that when a single clutch speed difference becomes invalid, the speed difference will not follow the invalid value but will remain at the value of the previous cycle. However, during normal clutch state switching, the speed difference output immediately follows the input at the next instant after the switch. In other words, it effectively handles invalid single speed difference values ​​without interfering with normal state switching.

[0061] Preferably, in order to facilitate software engineering applications, this embodiment can also integrate the two processing methods of step S2 and step S3 into an engineering model.

[0062] In step S2, the speed difference is processed by first-order low-pass filtering using equation (1), and different filtering coefficients are used to filter the speed difference within and outside the reasonable range. In step S3, when the clutch speed difference state switches, the current time retains the value of the previous time, and the output of the next time is directly reset by the input value. This processing method corresponds exactly to the two special filters in equation (1).

[0063] When the filter coefficient k c When = 0, Y(n) = Y(n-1), which means that the current value is equal to the previous value;

[0064] When the filter coefficient k c When = 1, Y(n) = X(n), which means that the output value is reset by the input value.

[0065] In summary, different filtering coefficients are used for different situations, and the clutch speed difference is processed by first-order low-pass filtering to form an engineering model for speed difference processing used for clutch slippage diagnosis. Figure 4 This is a flowchart of the filter coefficient calculation. In the diagram, S(n) represents the clutch speed difference state at the current moment, S(n-1) represents the clutch speed difference state at the previous moment, X(n) represents the clutch speed difference input value at the current moment, and n... lim k represents the extreme value within the reasonable range of clutch speed difference. c (n) represents the filter coefficients at the current time, k c (n+1) represents the filter coefficients for the next time step, k c1 For lower filter coefficients, k c2 This represents a higher filter coefficient.

[0066] When the clutch speed difference changes (S(n) ≠ S(n-1)), the filter coefficient is set to 0 at the current moment and 1 at the next moment. When the clutch speed difference remains unchanged, a lower filter coefficient is used if the speed difference is within the clutch range, and a higher filter coefficient is used if the speed difference is outside the clutch range. The control effect is as follows: Figure 5 and Figure 6 As shown.

[0067] Figure 5 The solid line represents the input n of the speed difference. in The dashed line represents the output n of the speed difference. out The dotted line represents the extreme value n within the reasonable range of the speed difference. limThe top image shows the clutch speed difference transitioning from within the reasonable range to outside the reasonable range, while the bottom image shows the clutch speed difference transitioning from outside the reasonable range to within the reasonable range. When the clutch speed difference is within the reasonable range, the filtering level is high, and the output speed difference change amplitude is significantly reduced. When the clutch speed difference is outside the reasonable range, the filtering level is low, and the output speed difference change amplitude is reduced to a lesser extent.

[0068] Figure 6 The solid line represents the input n of the speed difference. in The dashed line represents the output n of the speed difference. out The dotted line represents the extreme value n within the reasonable range of the speed difference. lim The top diagram shows the operating condition when a single invalid value occasionally appears within the reasonable range of the speed difference, while the bottom diagram shows the operating condition when a single invalid value occasionally appears outside the reasonable range of the speed difference. As can be seen from the processing effect, when a single invalid value appears, the output clutch speed difference does not change its state and is not disturbed by the invalid value.

[0069] This invention performs segmented filtering and delayed initialization of the speed difference, which can identify normally occurring signal differences or occasional invalid values ​​of the speed difference, eliminating interference from signal acquisition errors, micro-slip control, and single invalid signals, and will not affect the judgment of excessive speed difference when severe slippage or slippage occurs, thereby avoiding misdiagnosis of clutch slippage and improving the accuracy of diagnosis.

[0070] Example 2

[0071] The present invention also provides a speed difference processing device for clutch slippage diagnosis, comprising:

[0072] The module for obtaining the reasonable range of speed difference is used to determine the speed difference range of signal acquisition error and the speed difference range of signal micro-slip friction control. The larger value between the signal acquisition error range and the micro-slip friction speed error range is taken as the reasonable range of speed difference.

[0073] The filtering module is used to filter the input values ​​of the speed difference within the reasonable range and outside the reasonable range, respectively, to obtain the output value of the speed difference;

[0074] The state switching processing module switches between two states: when the speed difference is within a reasonable range and when it is outside a reasonable range. The current speed difference output value is the speed difference output value of the previous moment, and the speed difference output value of the next moment is equal to the speed difference input value of the next moment.

[0075] Example 3

[0076] The present invention also provides an electronic device, comprising: a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; the memory stores a computer program, which, when executed by the processor, causes the processor to perform the steps of a method for confirming the rotation path of a gear shift hub.

[0077] Example 4

[0078] The present invention also provides a computer-readable storage medium having executable instructions stored thereon, which, when executed by a processor, cause the processor to implement the method described thereon.

[0079] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can 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, etc.) containing computer-usable program code.

[0080] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can 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, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0081] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0082] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0083] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A method for processing speed difference for clutch slippage diagnosis, wherein the speed difference is the speed difference between the clutch input end and the output end, characterized in that, include: Determine the range of speed difference for signal acquisition error and the range of speed difference for signal micro-slip friction control. The larger value between the range of signal acquisition error and the range of speed error for micro-slip friction is taken as the reasonable range of speed difference. The input values ​​of the speed difference within and outside the reasonable range are filtered to obtain the output value of the speed difference. When the speed difference switches between two states, one within the reasonable range and the other outside the reasonable range, the speed difference output value at the current moment is the speed difference output value at the previous moment, and the speed difference output value at the next moment is equal to the speed difference input value at the next moment. Methods for determining the range of speed difference in signal acquisition error include: With the clutch output end suspended, a fixed torque is input to the clutch input end. This fixed torque plus a safety value is used as the clutch target torque for pressurization and engagement control to ensure that the clutch does not slip. The speed difference is tested for a period of time as the signal acquisition error range. Methods for determining the speed difference range of signal micro-slip control include: After the clutch is fully engaged, torque is input at the clutch input end to ensure torque transmission without slippage. The clutch temperature is tested, the clutch speed difference is increased, and the clutch temperature is maintained stable by adjusting the cooling system until the cooling system operating parameters exceed the threshold. The current clutch speed difference is recorded as the speed error range for micro-slippage control.

2. The speed difference processing method for clutch slippage diagnosis according to claim 1, characterized in that, The clutch speed difference input value is low-pass filtered using a discrete difference equation, which is as follows: Y(n)= (X(n)-Y(n-1))+Y(n-1); In the formula, X(n) is the filter coefficient, X(n) is the input value of the speed difference at the current time, Y(n-1) is the filter output value at the previous time, and Y(n) is the output value of the speed difference at the current time.

3. The speed difference processing method for clutch slippage diagnosis according to claim 2, characterized in that, When the speed difference input value is within a reasonable range =0.1~0.3; When the speed difference input value is outside the reasonable range =0.7~0.

9.

4. The speed difference processing method for clutch slippage diagnosis according to claim 1, characterized in that, Methods for handling speed difference also include: Identify instances where the speed difference occasionally jumps from a reasonable range to an unreasonable range, or from an unreasonable range to a reasonable range, and treat these as invalid interference values.

5. The speed difference processing method for clutch slippage diagnosis according to claim 4, characterized in that, The method for identifying invalid interference values ​​is as follows: like ,or but These are invalid interference values, among which Let be the clutch speed difference at time t. Let be the clutch speed difference in the kth signal cycle after time t. This represents the extreme value within the reasonable range of clutch speed difference.

6. A speed difference processing device for diagnosing clutch slippage, wherein the speed difference is the speed difference between the clutch input end and the output end, characterized in that, include: The module for obtaining the reasonable range of speed difference is used to determine the speed difference range of signal acquisition error and the speed difference range of signal micro-slip friction control. The larger value between the signal acquisition error range and the micro-slip friction speed error range is taken as the reasonable range of speed difference. The filtering module is used to filter the input values ​​of the speed difference within the reasonable range and outside the reasonable range, respectively, to obtain the output value of the speed difference; The state switching processing module switches between two states: when the speed difference is within a reasonable range and outside a reasonable range, the current speed difference output value is the previous speed difference output value, and the next speed difference output value is equal to the next speed difference input value. Methods for determining the range of speed difference in signal acquisition error include: With the clutch output end suspended, a fixed torque is input to the clutch input end. This fixed torque plus a safety value is used as the clutch target torque for pressurization and engagement control to ensure that the clutch does not slip. The speed difference is tested for a period of time as the signal acquisition error range. Methods for determining the speed difference range of signal micro-slip control include: After the clutch is fully engaged, torque is input at the clutch input end to ensure torque transmission without slippage. The clutch temperature is tested, the clutch speed difference is increased, and the clutch temperature is maintained stable by adjusting the cooling system until the cooling system operating parameters exceed the threshold. The current clutch speed difference is recorded as the speed error range for micro-slippage control.

7. An electronic device, comprising: The system comprises a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other via the communication bus; characterized in that the memory stores a computer program, which, when executed by the processor, causes the processor to perform the steps of the method according to any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, It stores executable instructions that, when executed by a processor, cause the processor to perform the steps of the method according to any one of claims 1 to 5.

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