Fault detection method, device and vehicle for filter in CVT transmission

Abstract

The present application provides a method, device and vehicle for detecting filter faults in a CVT transmission. When executing this method, the pressure value of the filter is first obtained, and then when the pressure value is greater than the pressure switch threshold and the pressure value is less than the blocking pressure switch threshold, the oil filling time of the hydraulic pump and the pressure building time of the hydraulic pump are obtained; then, according to the current engine parameters, the corresponding standard oil filling time and standard pressure building time are determined from the preset standard comparison table; finally, when the difference between the oil filling time and the standard oil filling time is less than or equal to the preset oil filling time difference range and the difference between the pressure building time and the standard pressure building time is less than or equal to the preset pressure building time difference range, it is determined that the filter has not failed. In this way, the present application further determines whether the filter is actually blocked by the oil filling time and the pressure building time of the hydraulic pump, thereby improving the accuracy of detecting filter faults.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a method and device for detecting a fault of a filter in a CVT transmission, and a vehicle. Background Art

[0002] A continuously variable transmission (CVT) is a type of vehicle transmission, also known as a continuously variable transmission (CVT). A filter is installed in a CVT transmission to filter impurities from the transmission. However, over time, impurities accumulate in the filter, causing filter blockage and reduced filtering effectiveness. Therefore, it's important to regularly check the filter's condition.

[0003] Currently, filter fault detection is usually based on the filter's own characteristics, calculating the filter's pressure value. When the filter's pressure value exceeds a fixed threshold, a filter fault is reported after a certain period of time.

[0004] If operations are carried out in the autumn and winter seasons in cold areas, the outside temperature is very low and the hydraulic oil is relatively viscous, resulting in a higher filter pressure value, which can easily exceed the pressure threshold of the filter pressure switch, thereby reporting a filter blockage fault. However, in fact, it is only caused by the viscosity of the oil due to low temperature, and it is not a real filter blockage fault. Therefore, there will be a misjudgment of a filter blockage fault. Summary of the Invention

[0005] In view of this, embodiments of the present application provide a method, device, and vehicle for detecting filter faults in a CVT transmission, aiming to improve the accuracy of detecting filter faults.

[0006] In a first aspect, an embodiment of the present application provides a method for detecting a fault of a filter in a CVT transmission, the method comprising:

[0007] Get the filter pressure value;

[0008] In response to the pressure value being greater than the pressure switch threshold and the pressure value being less than the blocking pressure switch threshold, obtaining the oil filling time and the pressure building time of the hydraulic pump; wherein the oil filling time is the time it takes to fill the pipeline from the filter to the hydraulic pump, and the pressure building time is the time it takes for the hydraulic pump to establish a preset hydraulic pump standard pressure, and the blocking pressure switch threshold is greater than the pressure switch threshold;

[0009] According to the current engine parameters, the corresponding standard oil filling time and standard pressure building time are determined from the preset standard comparison table;

[0010] If the first difference is less than or equal to the preset oil filling time difference range and the second difference is less than or equal to the preset pressure building time difference range, it is determined that the filter is not faulty, the first difference is the difference between the oil filling time and the standard oil filling time, and the second difference is the difference between the pressure building time and the standard pressure building time.

[0011] Optionally, determining the corresponding standard oil filling time and standard pressure building time from a preset standard comparison table according to the current engine parameters includes:

[0012] Get the current engine speed and current hydraulic oil temperature;

[0013] According to the current engine speed and the current hydraulic oil temperature, the corresponding standard oil filling time and standard pressure building time are determined from the preset standard comparison table.

[0014] Optionally, the preset standard comparison table is established in the following manner:

[0015] When the filter is in a normal operating condition, obtaining a plurality of engine speeds and a plurality of hydraulic oil temperatures corresponding to each of the plurality of engine speeds, wherein the plurality of hydraulic oil temperatures satisfy a hydraulic oil operating temperature range corresponding to each of the plurality of engine speeds;

[0016] Determining, based on each engine speed and a plurality of hydraulic oil temperatures corresponding to each engine speed, a standard oil filling time and a standard pressure building time of the hydraulic pump corresponding to each engine speed at different hydraulic oil temperatures;

[0017] The preset standard comparison table is established based on the standard oil filling time of the hydraulic pump and the standard pressure building time of the hydraulic pump corresponding to each engine speed at different hydraulic oil temperatures.

[0018] Optionally, the method further includes: if the first difference is greater than a preset oil filling time difference range and / or the second difference is greater than a preset pressure building time difference range, determining that the filter has failed.

[0019] Optionally, if the first difference is greater than a preset oil filling time difference range and / or the second difference is greater than a preset pressure building time difference range, the method further includes:

[0020] When the first difference is greater than a preset oil filling time difference range, determining a corresponding first correction time coefficient;

[0021] Using the first correction time coefficient, correcting the fault reporting time of the filter;

[0022] When the second difference is greater than a preset oil filling time difference range, determining a corresponding second correction time coefficient;

[0023] Using the second correction time coefficient, correcting the fault reporting time of the filter;

[0024] When the first difference is greater than a preset oil filling time difference range and the second difference is greater than a preset pressure building time difference range, determining a corresponding first correction time coefficient and a corresponding second correction time coefficient;

[0025] The first correction time coefficient and the second correction time coefficient are used to correct the fault reporting time of the filter.

[0026] In a second aspect, an embodiment of the present application provides a fault detection device for a filter in a CVT transmission, the device comprising:

[0027] A first acquisition module is used to obtain a pressure value of a filter;

[0028] a second acquisition module, configured to acquire, in response to the pressure value being greater than a pressure switch threshold and the pressure value being less than a blocking pressure switch threshold, an oil filling time and a pressure building time of the hydraulic pump; wherein the oil filling time is a time for filling the pipeline from the filter to the hydraulic pump, the pressure building time is a time for the hydraulic pump to establish a preset hydraulic pump standard pressure, and the blocking pressure switch threshold is greater than the pressure switch threshold;

[0029] The first determination module is used to determine the corresponding standard oil filling time and standard pressure building time from a preset standard comparison table according to the current engine parameters;

[0030] The second determination module is used to determine that the filter is not faulty if the first difference is less than or equal to the preset oil filling time difference range and the second difference is less than or equal to the preset pressure building time difference range, the first difference is the difference between the oil filling time and the standard oil filling time, and the second difference is the difference between the pressure building time and the standard pressure building time.

[0031] Optionally, the first determining module is specifically configured to obtain a current engine speed and a current hydraulic oil temperature;

[0032] According to the current engine speed and the current hydraulic oil temperature, the corresponding standard oil filling time and standard pressure building time are determined from the preset standard comparison table.

[0033] Optionally, the device further includes a third determining module;

[0034] The third determination module is configured to determine that the filter is faulty if the first difference is greater than a preset oil filling time difference range and / or the second difference is greater than a preset pressure building time difference range.

[0035] In a third aspect, the present application provides a vehicle, the vehicle comprising a controller, the controller comprising a memory and a processor;

[0036] The memory is used to store one or more programs;

[0037] The processor; when the one or more programs are executed by the processor, any one of the above methods is implemented.

[0038] In a fourth aspect, the present application provides a storage medium having a program stored thereon, and when the program is executed by a processor, any one of the above methods is implemented.

[0039] The above technical solution has the following beneficial effects:

[0040] The present application provides a method, device, and vehicle for detecting filter faults in a CVT transmission. When executing the method, the filter pressure value is first obtained. Then, when the pressure value is greater than the pressure switch threshold and less than the blockage pressure switch threshold, the hydraulic pump's oil filling time and hydraulic pump's pressure building time are obtained. The oil filling time is the time it takes for the pipeline from the filter to the hydraulic pump to fill oil, and the pressure building time is the time it takes for the hydraulic pump to establish a preset hydraulic pump standard pressure. The blockage pressure switch threshold is greater than the pressure switch threshold. Then, based on the current engine parameters, the corresponding standard oil filling time and standard pressure building time are determined from a preset standard comparison table. Finally, when the difference between the oil filling time and the standard oil filling time is less than or equal to the preset oil filling time difference range and the difference between the pressure building time and the standard pressure building time is less than or equal to the preset pressure building time difference range, it is determined that the filter is not faulty. In this way, when the pressure value of the filter is greater than the pressure switch threshold and the pressure value of the filter is less than the blockage pressure switch threshold, the present application further determines whether the filter is actually blocked through the oil filling time of the hydraulic pump and the pressure building time of the hydraulic pump, thereby improving the accuracy of detecting filter failures. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in this embodiment or the prior art, the following briefly introduces the drawings required for use in the embodiment or the prior art description. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0042] Figure 1 A flow chart of a method for detecting a fault in a filter in a CVT transmission provided by an embodiment of the present application;

[0043] Figure 2A schematic structural diagram of a fault detection device for a filter in a CVT transmission provided in an embodiment of the present application. DETAILED DESCRIPTION

[0044] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0045] The relevant terms in the embodiments of this application are introduced as follows:

[0046] A continuously variable transmission (CVT) is a type of automotive transmission, also known as a continuously variable transmission (CVT). Unlike a stepless transmission (GMT), a CVT uses a continuous series of speed ratios rather than discrete points. This improves fuel economy, power, and ride quality, while also reducing emissions and costs.

[0047] Filter: refers to an accessory installed in the CVT transmission that filters impurities or gases through filter paper or filter mesh.

[0048] To facilitate understanding of the technical solution provided by this application, the background technology involved in this application will be explained below.

[0049] In the prior art, filter fault detection is usually based on the filter's own characteristics, and the filter pressure value is calculated. When the filter pressure value is greater than a fixed threshold, the filter fault is reported after a certain period of time.

[0050] After research, the inventor found that when working in the autumn and winter seasons in cold areas, the outside temperature is very low and the hydraulic oil is relatively viscous, which leads to a high pressure value of the filter, which can easily exceed the pressure threshold of the filter pressure switch, thereby reporting a filter blockage failure. However, in fact, it is only caused by the viscosity of the oil due to low temperature, not a real filter blockage failure. Therefore, there will be a misjudgment of the filter blockage failure and a lack of accuracy.

[0051] In order to overcome the above technical problems, the present invention provides a method for detecting filter faults in a CVT transmission. The method can be performed by a telematics control unit (TCU) to perform each step of the filter fault detection method. Figure 1 , Figure 1 A flow chart of a method for detecting a fault in a filter in a CVT transmission provided in an embodiment of the present application. The method may include:

[0052] Step S101: Obtain the pressure value of the filter.

[0053] In the embodiment of the present application, the pressure value of the filter is first obtained to facilitate the subsequent judgment of the pressure value of the filter.

[0054] It should be noted that the present application does not limit the method for obtaining the filter pressure value. For example, the filter pressure value can be obtained through a pressure sensor.

[0055] Step S102: In response to the pressure value being greater than the pressure switch threshold and the pressure value being less than the blocking pressure switch threshold, the oil filling time of the hydraulic pump and the pressure building time of the hydraulic pump are obtained; wherein, the oil filling time is the oil filling time of the pipeline from the filter to the hydraulic pump, the pressure building time is the time for the hydraulic pump to establish a preset hydraulic pump standard pressure, and the blocking pressure switch threshold is greater than the pressure switch threshold.

[0056] It should be noted that the preset hydraulic pump standard pressure can be determined according to the model of the hydraulic pump, and different models of hydraulic pumps correspond to different standard pressures.

[0057] Specifically, after obtaining the pressure value of the filter through step S101, the embodiment of the present application further judges the pressure value. When the pressure value of the filter is greater than the pressure switch threshold and the pressure value of the filter is less than the blockage pressure switch threshold, the hydraulic pump filling time and the hydraulic pump pressure building time are further obtained; wherein, the hydraulic pump filling time is the pipeline filling time from the filter to the hydraulic pump, and the pressure building time is the time for the hydraulic pump to establish a preset hydraulic pump standard pressure.

[0058] It should be noted that the pressure switch threshold and the blockage pressure switch threshold can be set according to actual conditions, wherein the blockage pressure switch threshold is greater than the pressure switch threshold.

[0059] Correspondingly, if the first difference is greater than the clogging pressure switch threshold, the filter fault is reported after the preset filter fault reporting time T1. It is understood that the preset filter fault reporting time T1 can be set according to actual conditions and is not limited here.

[0060] It should be noted that in actual applications, the oil filling time and the pressure building time of a hydraulic pump can be obtained, and the oil filling time and the pressure building time of multiple hydraulic pumps can also be obtained to further improve the accuracy of detecting filter failures.

[0061] It should be noted that in the prior art, when the filter pressure exceeds the pressure switch threshold, the filter is directly determined to be faulty and an alarm is issued after a certain period of time. However, during operations in cold regions during the autumn and winter months, when the outside temperature is very low and the hydraulic oil is relatively viscous, the filter pressure is high, which can easily exceed the filter pressure switch threshold and thus indicate a filter blockage fault. However, this is actually due to the low temperature and oil viscosity, not an actual filter blockage fault, which can lead to a misjudgment of a filter blockage fault.

[0062] Therefore, in this application, when the pressure value of the filter is greater than the pressure switch threshold and the pressure value of the filter is less than the blockage pressure switch threshold, the oil filling time of the hydraulic pump and the pressure building time of the hydraulic pump are further obtained to facilitate the subsequent determination of whether the filter is actually blocked, thereby improving the accuracy of detecting filter failures.

[0063] In actual use, when the filter pressure exceeds the pressure switch threshold and is less than the clogging pressure switch threshold, the time the filter pressure exceeds the pressure switch threshold and the time the hydraulic pump pressure sensor detects pressure can be recorded to determine the oil filling time of the pipeline from the filter to the hydraulic pump. The time it takes for the hydraulic pump pressure to establish the preset hydraulic pump standard pressure can also be recorded and analyzed. If the oil filling time and pressure buildup time are within the normal range, it indicates that the filter is not clogged, but rather that the system oil pressure is high due to low temperature and oil viscosity. In this case, the filter fault will be masked and will not be reported.

[0064] Step S103: According to the current engine parameters, the corresponding standard oil filling time and standard pressure building time are determined from a preset standard comparison table.

[0065] In an embodiment of the present application, after obtaining the oil filling time and the pressure building time of the hydraulic pump through step S102, the corresponding standard oil filling time and the standard pressure building time are further determined from the preset standard comparison table based on the current engine parameters, so as to determine whether the oil filling time and the pressure building time of the hydraulic pump are within the normal range.

[0066] In one possible implementation, determining the corresponding standard oil filling time and standard pressure building time from a preset standard comparison table based on current engine parameters includes: obtaining a current engine speed and a current hydraulic oil temperature; and determining the corresponding standard oil filling time and standard pressure building time from the preset standard comparison table based on the current engine speed and the current hydraulic oil temperature. The current engine parameters include the current engine speed and the current hydraulic oil temperature.

[0067] Specifically, after obtaining the hydraulic pump's oil filling time and the hydraulic pump's pressure building time, the current engine speed and the current hydraulic oil temperature are further obtained, and based on the current engine speed and the current hydraulic oil temperature, the corresponding standard oil filling time and standard pressure building time are determined from the preset standard comparison table, so as to determine whether the hydraulic pump's oil filling time and the hydraulic pump's pressure building time are within the normal range.

[0068] It should be noted that the preset standard comparison table shows a corresponding relationship between engine speed, hydraulic oil temperature, standard hydraulic pump filling time, and standard hydraulic pump pressure buildup time. Based on the current engine speed and hydraulic oil temperature, the preset standard comparison table can be used to find the standard filling time and standard pressure buildup time corresponding to the current engine speed and hydraulic oil temperature, thereby determining whether the hydraulic pump filling time and hydraulic pump pressure buildup time are within the normal range.

[0069] In one possible implementation, the preset standard comparison table is established in the following manner:

[0070] When the filter is in a normal operating condition, obtaining a plurality of engine speeds and a plurality of hydraulic oil temperatures corresponding to each of the plurality of engine speeds, wherein the plurality of hydraulic oil temperatures satisfy a hydraulic oil operating temperature range corresponding to each of the plurality of engine speeds;

[0071] Determining, based on each engine speed and a plurality of hydraulic oil temperatures corresponding to each engine speed, a standard oil filling time and a standard pressure building time of the hydraulic pump corresponding to each engine speed at different hydraulic oil temperatures;

[0072] The preset standard comparison table is established based on the standard oil filling time of the hydraulic pump and the standard pressure building time of the hydraulic pump corresponding to each engine speed at different hydraulic oil temperatures.

[0073] Specifically, in the embodiment of the present application, when the filter is in normal working conditions, each engine speed and each hydraulic oil temperature corresponding to each engine speed are obtained in advance, wherein the hydraulic oil temperature satisfies the hydraulic oil operating temperature range corresponding to each engine speed, and based on each engine speed and each hydraulic oil operating temperature corresponding to each engine speed, the hydraulic pump filling time and hydraulic pump pressure building time corresponding to each engine speed at different hydraulic oil temperatures are recorded; and based on the hydraulic pump filling time and hydraulic pump pressure building time corresponding to each engine speed at different hydraulic oil temperatures, a preset standard comparison table is established. It can be understood that in the preset standard comparison table, the engine speed, hydraulic oil temperature, hydraulic pump standard filling time and hydraulic pump standard pressure building time have a corresponding relationship.

[0074] In actual applications, the standard comparison table can be improved by setting various hydraulic oil temperatures within the hydraulic oil operating temperature range corresponding to various engine speeds.

[0075] It should be noted that for the same oil type and oil pipeline, the oil filling time and hydraulic pump pressure build time are affected by the engine speed and hydraulic oil temperature. Therefore, in the embodiment of the present application, under normal filter conditions, by setting different engine speeds and hydraulic oil temperatures, a preset standard comparison table of corresponding hydraulic pump standard oil filling time and hydraulic pump standard pressure build time can be established.

[0076] Step S104: If the first difference is less than or equal to the preset oil filling time difference range and the second difference is less than or equal to the preset pressure building time difference range, it is determined that the filter is not faulty, the first difference is the difference between the oil filling time and the standard oil filling time, and the second difference is the difference between the pressure building time and the standard pressure building time.

[0077] In an embodiment of the present application, when the difference between the oil filling time and the standard oil filling time is less than or equal to the preset oil filling time difference range and the difference between the pressure building time and the standard pressure building time is less than or equal to the preset pressure building time difference range, that is, when the oil filling time and the pressure building time are within the normal range, it is determined that the filter has not failed.

[0078] It should be noted that the preset oil filling time difference range and the preset pressure building time difference range can be set according to actual conditions, and this application does not limit them here.

[0079] It can be seen from the above technical solution that the embodiment of the present application first obtains the pressure value of the filter, and then when the pressure value is greater than the pressure switch threshold and the pressure value is less than the blocking pressure switch threshold, obtains the hydraulic pump's oil filling time and the hydraulic pump's pressure building time; then, based on the current engine parameters, determines the corresponding standard oil filling time and standard pressure building time from the preset standard comparison table; finally, when the difference between the oil filling time and the standard oil filling time is less than or equal to the preset oil filling time difference range and the difference between the pressure building time and the standard pressure building time is less than or equal to the preset pressure building time difference range, it is determined that the filter has not failed. In this way, the present application further determines whether the filter is actually blocked by the hydraulic pump's oil filling time and the hydraulic pump's pressure building time, thereby improving the accuracy of detecting filter failures.

[0080] In a possible implementation, when the first difference is greater than a preset oil filling time difference range and / or the second difference is greater than a preset pressure building time difference range, it is determined that the filter has failed.

[0081] Specifically, when the first difference is greater than a preset oil filling time difference range, or the second difference is greater than a preset pressure building time difference range, it can be determined that the filter has failed.

[0082] Accordingly, when the first difference is greater than a preset oil filling time difference range and the second difference is greater than a preset pressure build time difference range, a filter failure is determined and a filter failure is reported after a preset filter failure reporting time T1 has elapsed. It will be appreciated that the preset filter failure reporting time T1 can be set based on actual circumstances and is not limited herein.

[0083] In a possible implementation, if the first difference is greater than a preset oil filling time difference range and / or the second difference is greater than a preset pressure building time difference range, the method further includes:

[0084] When the first difference is greater than a preset oil filling time difference range, determining a corresponding first correction time coefficient;

[0085] Using the first correction time coefficient, correcting the fault reporting time of the filter;

[0086] When the second difference is greater than a preset oil filling time difference range, determining a corresponding second correction time coefficient;

[0087] Using the second correction time coefficient, correcting the fault reporting time of the filter;

[0088] When the first difference is greater than a preset oil filling time difference range and the second difference is greater than a preset pressure building time difference range, determining a corresponding first correction time coefficient and a corresponding second correction time coefficient;

[0089] The first correction time coefficient and the second correction time coefficient are used to correct the fault reporting time of the filter.

[0090] Specifically, in the present application, when the first difference is greater than the preset oil filling time difference range, the corresponding first correction time coefficient K1 is determined, and the first correction time coefficient K1 is used to correct the fault reporting time T1 of the filter.

[0091] When the second difference is greater than the preset pressure building time difference range, the corresponding second correction time coefficient K2 is determined, and the second correction time coefficient K2 is used to correct the filter fault reporting time T1.

[0092] Correspondingly, when the first difference is greater than the preset oil filling time difference range and the second difference is greater than the preset pressure building time difference range, the corresponding first correction time coefficient K1 and the corresponding second correction time coefficient K2 are determined; the first correction time coefficient K1 and the second correction time coefficient K2 are used to correct the fault reporting time T1 of the filter.

[0093] It should be noted that the first correction time coefficient K1 is related to the oil filling time, and the second correction time coefficient K2 is related to the pressure buildup time. The larger the difference between the oil filling time and the standard oil filling time, the smaller the first correction time coefficient K1, resulting in a shorter fault reporting time. The larger the difference between the pressure buildup time and the standard pressure buildup time, the smaller the second correction time coefficient K2, resulting in a shorter fault reporting time.

[0094] In actual applications, within the corrected fault reporting time, if the oil temperature is increased by warming up the engine, or the influence of the external temperature on the oil temperature is reduced, the filter pressure value will be lower than the pressure switch threshold. Since the fault is caused by the viscosity of the oil due to low temperature, the fault will not be reported, thereby improving the accuracy of filter fault detection.

[0095] For simplicity of description, the aforementioned method embodiments are described as a series of actions. However, those skilled in the art should be aware that the present invention is not limited by the order of the actions described, as certain steps can be performed in other orders or simultaneously according to the present invention. Furthermore, those skilled in the art should also be aware that the embodiments described in this specification are preferred embodiments, and the actions and modules involved are not necessarily required for the present invention.

[0096] The above are some specific implementations of a method for detecting a filter fault in a CVT transmission provided by the present application. Based on this, the present application also provides a corresponding device. The device provided by the present application embodiment will be introduced from the perspective of functional modularization.

[0097] See also Figure 2 The structure diagram of a fault detection device for a filter in a CVT transmission is shown, and the device may include a first acquisition module 100, a second acquisition module 200, a first determination module 300, and a second determination module 400.

[0098] A first acquisition module 100 is used to obtain a pressure value of a filter;

[0099] a second acquisition module 200 for acquiring, in response to the pressure value being greater than a pressure switch threshold and the pressure value being less than a blocking pressure switch threshold, an oil filling time and a pressure building time of the hydraulic pump; wherein the oil filling time is the time it takes to fill the pipeline from the filter to the hydraulic pump, and the pressure building time is the time it takes for the hydraulic pump to establish a preset hydraulic pump standard pressure; and the blocking pressure switch threshold is greater than the pressure switch threshold;

[0100] The first determination module 300 is used to determine the corresponding standard oil filling time and standard pressure building time from a preset standard comparison table according to the current engine parameters;

[0101] The second determination module 400 is used to determine that the filter is not faulty if the first difference is less than a preset oil filling time difference range and the second difference is less than a preset pressure building time difference range, wherein the first difference is the difference between the oil filling time and the standard oil filling time, and the second difference is the difference between the pressure building time and the standard pressure building time.

[0102] Optionally, the first determining module is specifically configured to obtain a current engine speed and a current hydraulic oil temperature;

[0103] According to the current engine speed and the current hydraulic oil temperature, the corresponding standard oil filling time and standard pressure building time are determined from the preset standard comparison table.

[0104] Optionally, the device further includes a third determining module;

[0105] The third determination module is configured to determine that the filter is faulty if the first difference is greater than a preset oil filling time difference range and / or the second difference is greater than a preset pressure building time difference range.

[0106] As can be seen from the above technical solution, the embodiment of the present application first obtains the pressure value of the filter, and then when the pressure value is greater than the pressure switch threshold and the pressure value is less than the blocking pressure switch threshold, obtains the hydraulic pump's oil filling time and the hydraulic pump's pressure building time; then, based on the current engine parameters, determines the corresponding standard oil filling time and standard pressure building time from the preset standard comparison table; finally, when the difference between the oil filling time and the standard oil filling time is less than or equal to the preset oil filling time difference range and the difference between the pressure building time and the standard pressure building time is less than or equal to the preset pressure building time difference range, it is determined that the filter has not failed. In this way, the present application further determines whether the filter is actually blocked by the hydraulic pump's oil filling time and the hydraulic pump's pressure building time, thereby improving the accuracy of detecting filter failures.

[0107] An embodiment of the present application further provides a vehicle, the vehicle comprising a controller, the controller comprising a memory and a processor;

[0108] The memory is used to store one or more programs;

[0109] The processor; when the one or more programs are executed by the processor, a fault detection method for a filter in a CVT transmission described in the above embodiment is implemented.

[0110] An embodiment of the present application further provides a storage medium on which a program is stored. When the program is executed by a processor, the method for detecting a fault of a filter in a CVT transmission described in the above embodiment is implemented.

[0111] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0112] Those skilled in the art will understand that the flowchart shown in the figure is only an example in which the embodiments of the present application can be implemented, and the scope of application of the embodiments of the present application is not limited by any aspect of the flowchart.

[0113] In the several embodiments provided in this application, it should be understood that the disclosed methods, devices and equipment can be implemented in other ways. For example, the device 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. For example, 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 through some communication interface, the indirect coupling or communication connection of the device or unit can be electrical, mechanical or other forms.

[0114] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected based on actual needs to achieve the purpose of the present embodiment. Furthermore, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit.

[0115] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one 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 is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for detecting a filter fault in a CVT transmission, characterized in that: The method comprises: Get the filter pressure value; In response to the pressure value being greater than a pressure switch threshold and the pressure value being less than a blocking pressure switch threshold, obtaining a filling time of the hydraulic pump and a pressure building time of the hydraulic pump; wherein the filling time is a time for filling the pipeline from the filter to the hydraulic pump, and the pressure building time is a time for the hydraulic pump to establish a preset hydraulic pump standard pressure, and the blocking pressure switch threshold is greater than the pressure switch threshold; According to the current engine parameters, the corresponding standard oil filling time and standard pressure building time are determined from the preset standard comparison table; If the first difference is less than or equal to a preset oil filling time difference range and the second difference is less than or equal to a preset pressure building time difference range, it is determined that the filter is not faulty, the first difference being the difference between the oil filling time and the standard oil filling time, and the second difference being the difference between the pressure building time and the standard pressure building time; Determining the corresponding standard oil filling time and standard pressure building time from a preset standard comparison table based on the current engine parameters includes: obtaining the current engine speed and the current hydraulic oil temperature; and determining the corresponding standard oil filling time and standard pressure building time from the preset standard comparison table based on the current engine speed and the current hydraulic oil temperature; The preset standard comparison table is established in the following manner: when the filter is in normal working conditions, multiple engine speeds and multiple hydraulic oil temperatures corresponding to each engine speed are obtained, and the multiple hydraulic oil temperatures meet the hydraulic oil working temperature range corresponding to each engine speed; according to each engine speed and the multiple hydraulic oil temperatures corresponding to each engine speed, the standard oil filling time and the standard pressure building time of the hydraulic pump corresponding to each engine speed at different hydraulic oil temperatures are determined; based on the standard oil filling time and the standard pressure building time of the hydraulic pump corresponding to each engine speed at different hydraulic oil temperatures, the preset standard comparison table is established.

2. The method according to claim 1, characterized in that The method further includes: if the first difference is greater than a preset oil filling time difference range and / or the second difference is greater than a preset pressure building time difference range, determining that the filter has failed.

3. The method according to claim 2, characterized in that If the first difference is greater than a preset oil filling time difference range and / or the second difference is greater than a preset pressure building time difference range, the method further includes: When the first difference is greater than a preset oil filling time difference range, determining a corresponding first correction time coefficient; Using the first correction time coefficient, correcting the fault reporting time of the filter; When the second difference is greater than a preset oil filling time difference range, determining a corresponding second correction time coefficient; Using the second correction time coefficient, correcting the fault reporting time of the filter; When the first difference is greater than a preset oil filling time difference range and the second difference is greater than a preset pressure building time difference range, determining a corresponding first correction time coefficient and a corresponding second correction time coefficient; The first correction time coefficient and the second correction time coefficient are used to correct the fault reporting time of the filter.

4. A fault detection device for a filter in a CVT transmission, characterized in that: The device comprises: A first acquisition module is used to obtain a pressure value of a filter; a second acquisition module, configured to acquire, in response to the pressure value being greater than a pressure switch threshold and the pressure value being less than a blocking pressure switch threshold, an oil filling time and a pressure building time of the hydraulic pump; wherein the oil filling time is a time for filling the pipeline from the filter to the hydraulic pump, the pressure building time is a time for the hydraulic pump to establish a preset hydraulic pump standard pressure, and the blocking pressure switch threshold is greater than the pressure switch threshold; The first determination module is used to determine the corresponding standard oil filling time and standard pressure building time from a preset standard comparison table according to the current engine parameters; a second determining module, configured to determine that the filter is not faulty if a first difference is less than or equal to a preset oil filling time difference range and a second difference is less than or equal to a preset pressure building time difference range, the first difference being the difference between the oil filling time and the standard oil filling time, and the second difference being the difference between the pressure building time and the standard pressure building time; The first determination module is specifically configured to obtain a current engine speed and a current hydraulic oil temperature; and determine corresponding standard oil filling time and standard pressure building time from the preset standard comparison table according to the current engine speed and the current hydraulic oil temperature; The preset standard comparison table is established in the following manner: when the filter is in normal working conditions, multiple engine speeds and multiple hydraulic oil temperatures corresponding to each engine speed are obtained, and the multiple hydraulic oil temperatures meet the hydraulic oil working temperature range corresponding to each engine speed; according to each engine speed and the multiple hydraulic oil temperatures corresponding to each engine speed, the standard oil filling time and the standard pressure building time of the hydraulic pump corresponding to each engine speed at different hydraulic oil temperatures are determined; based on the standard oil filling time and the standard pressure building time of the hydraulic pump corresponding to each engine speed at different hydraulic oil temperatures, the preset standard comparison table is established.

5. The device according to claim 4, characterized in that The apparatus further includes a third determining module; The third determination module is configured to determine that the filter is faulty if the first difference is greater than a preset oil filling time difference range and / or the second difference is greater than a preset pressure building time difference range.

6. A vehicle, characterized in that: The vehicle includes a controller including a memory and a processor; The memory is used to store one or more programs; The processor; when the one or more programs are executed by the processor, implements the method according to any one of claims 1 to 3.

7. A storage medium, characterized in that: The storage medium stores a program, and when the program is executed by a processor, the method according to any one of claims 1 to 3 is implemented.

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