A gearbox pressure-current characteristic calibration method, device and equipment

Abstract

The application provides a gearbox pressure-current characteristic calibration method, device and equipment. After determining m test current points, the valve body pressure value and the gearbox pressure value corresponding to each test current point are obtained. Then, the slope and intercept of the gearbox current-pressure curve and the valve body current-pressure curve are calculated based on the valve body pressure value and the gearbox pressure value corresponding to the test current point. Whether the slope and intercept of the gearbox current-pressure curve and the valve body current-pressure curve meet the preset constraint condition is judged. When the preset constraint condition is met, it is indicated that the valve body and the gearbox meet the design requirements. When the valve body and the gearbox are offline, the band of the related test points is examined.

Description

Technical Field

[0001] This invention relates to the field of vehicle control technology, and specifically to a method, apparatus, and device for verifying the pressure-current characteristics of a transmission. Background Technology

[0002] Automobiles are an essential means of transportation for users in modern life. To ensure user safety, it is necessary to perform PC characteristic verification on the valve body and housing of the vehicle. A schematic diagram of the current conventional PC characteristic verification methods for valve bodies and housings is shown below. Figure 1 As shown, in actual testing, the number of detection points can be set according to user needs, and can be 3 points or more, such as... Figure 1 As shown, for ease of explanation, three test points are used as an example. See [link / reference]. Figure 1 The x-axis represents current, and the y-axis represents pressure. Three detection points, denoted as p1, p2, and p3, and q1, q2, and q3, are respectively positioned on the diagonal lines of the housing PC and the valve body PC. p represents the pressure point corresponding to the current on the housing, and q represents the pressure point corresponding to the current on the valve body. Figure 1 In the diagram, Curr represents the current test point. During testing, the p-point band and q-point band are measured, where the p-point band represents the pressure point band of the housing, and the q-point band represents the pressure point band of the valve body. During the testing process, when the valve body is decommissioned, the band test is performed on the relevant test points; when the housing is decommissioned, the band test is performed on the test points corresponding to the same current. Currently, there are two main problems:

[0003] 1. The current verification does not include the valve body PC and housing PC, and the slope and intercept of each are not assessed, which fails to better guarantee the hydraulic characteristics of the valve body and housing themselves;

[0004] 2. The current verification ignores the correlation between the design of the valve body and the housing. Although both are within a reasonable range, when assembled together, they may not be within a reasonable range and cannot better reflect the cooperation characteristics between the two. Summary of the Invention

[0005] In view of this, embodiments of the present invention provide a method, apparatus, and device for verifying the pressure-current characteristics of a gearbox, to ensure the hydraulic characteristics of the gearbox and valve body and the matching degree between the gearbox and valve body.

[0006] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] A method for verifying the pressure-current characteristics of a transmission includes:

[0008] Obtain the valve body pressure value and the chamber pressure value corresponding to m test current points, where m is a positive integer not less than 3;

[0009] Based on the valve body pressure value and the chamber pressure value corresponding to the m test current points, calculate the slope and intercept of the chamber current-pressure curve and the valve body current-pressure curve respectively.

[0010] Determine whether the slope and intercept of the current-pressure curve of the housing and the current-pressure curve of the valve both meet the preset constraint conditions.

[0011] When all preset conditions are met, when the valve body is detected to be offline, the valve body pressure values ​​corresponding to m test current points are subjected to band assessment, and when the housing is detected to be offline, the housing pressure values ​​corresponding to m test current points are subjected to band assessment.

[0012] Optionally, in the above-mentioned transmission pressure-current characteristic verification method, determining whether the slope and intercept of the gearbox current-pressure curve and the valve body current-pressure curve both meet preset constraint conditions includes:

[0013] Determine whether the slope of the current-pressure curve of the enclosure is within the first preset slope range;

[0014] Determine whether the intercept of the current-pressure curve of the enclosure is within the first preset intercept range;

[0015] Determine whether the slope of the valve body current-pressure curve is within the second preset slope range;

[0016] Determine whether the intercept of the valve body current-pressure curve is within the second preset intercept range;

[0017] Determine whether the slope difference between the box current-pressure curve and the valve current-pressure curve is within a preset slope difference range;

[0018] Determine whether the intercept difference between the current-pressure curve of the housing and the current-pressure curve of the valve is within the preset intercept difference range.

[0019] Optionally, in the above-mentioned transmission pressure-current characteristic verification method, the step of calculating the slope and intercept of the transmission current-pressure curve and the valve body current-pressure curve based on the valve body pressure value and transmission pressure value corresponding to the m test current points includes:

[0020] The least squares method is used to calculate the slope and intercept of the box current-pressure curve and the valve current-pressure curve based on the valve body pressure value and the box pressure value corresponding to the m test current points.

[0021] Optionally, in the above method for verifying the pressure-current characteristics of the transmission, obtaining the valve body pressure value and the gearbox pressure value corresponding to m test current points includes:

[0022] Obtain the valve body pressure value and the chamber pressure value corresponding to m equally spaced test current points.

[0023] Optionally, in the above-mentioned transmission pressure-current characteristic verification method, the least squares method is used to calculate the slope and intercept of the transmission current-pressure curve and the valve body current-pressure curve based on the valve body pressure value and transmission pressure value corresponding to the m test current points, including:

[0024] The least squares method is used based on the formula B_p=[∑(Xi Yi) p )-(∑Xi ∑Yi p ) / m] / [∑Xi 2 -(∑Xi) 2 The intercept B_p of the current-pressure curve of the enclosure is calculated by / m];

[0025] Where i is a positive integer not greater than m, Xi represents the current value at the i-th test current point, and Yi p This represents the chamber pressure value corresponding to the i-th test current point;

[0026] The least squares method is used based on the formula K_p=(∑Yi) p The slope value K_p of the current-pressure curve of the box is calculated by ) / m–B_p(∑Xi) / m;

[0027] The least squares method is used based on the formula B_q=[∑(Xi Yi) q )-(∑Xi∑Yi q ) / m] / [∑Xi 2 -(∑Xi) 2 The intercept B_q of the valve body current-pressure curve is calculated from / m];

[0028] The Yi q This represents the valve body pressure value corresponding to the i-th test current point;

[0029] The least squares method is used based on the formula K_q=(∑Yi) q The slope value K_q of the valve body current-pressure curve is calculated by ) / m–B_q(∑Xi) / m.

[0030] A transmission pressure-current characteristic verification device, comprising:

[0031] The pressure value acquisition unit is used to acquire the valve body pressure value and the box pressure value corresponding to m test current points, where m is a positive integer not less than 3;

[0032] The slope and intercept calculation unit is used to calculate the slope and intercept of the box current-pressure curve and the valve current-pressure curve respectively based on the valve body pressure value and the box pressure value corresponding to the m test current points.

[0033] The constraint condition judgment unit is used to determine whether the slope and intercept of the box current-pressure curve and the valve current-pressure curve both meet the preset constraint conditions.

[0034] The assessment unit is used to perform band assessment on the valve body pressure values ​​corresponding to m test current points when the valve body is detected to be offline, and to perform band assessment on the box pressure values ​​corresponding to m test current points when the box body is detected to be offline, provided that all preset conditions are met.

[0035] Optionally, in the above-mentioned gearbox pressure-current characteristic verification device, the constraint condition judgment unit, when judging whether the slope and intercept of the gearbox current-pressure curve and the valve body current-pressure curve both meet the preset constraint conditions, is specifically used for:

[0036] Determine whether the slope of the current-pressure curve of the enclosure is within the first preset slope range;

[0037] Determine whether the intercept of the current-pressure curve of the enclosure is within the first preset intercept range;

[0038] Determine whether the slope of the valve body current-pressure curve is within the second preset slope range;

[0039] Determine whether the intercept of the valve body current-pressure curve is within the second preset intercept range;

[0040] Determine whether the slope difference between the box current-pressure curve and the valve current-pressure curve is within a preset slope difference range;

[0041] Determine whether the intercept difference between the current-pressure curve of the housing and the current-pressure curve of the valve is within the preset intercept difference range.

[0042] Optionally, in the aforementioned gearbox pressure-current characteristic verification device, when the slope and intercept calculation unit calculates the slope and intercept of the gearbox current-pressure curve and the valve body current-pressure curve based on the valve body pressure value and gearbox pressure value corresponding to the m test current points, it is specifically used for:

[0043] The least squares method is used based on the formula B_p=[∑(Xi Yi) p )-(∑Xi ∑Yi p ) / m] / [∑Xi 2 -(∑Xi) 2 The intercept B_p of the current-pressure curve of the enclosure is calculated by / m];

[0044] Where i is a positive integer not greater than m, Xi represents the current value at the i-th test current point, and Yi p This represents the chamber pressure value corresponding to the i-th test current point;

[0045] The least squares method is used based on the formula K_p=(∑Yi) p The slope value K_p of the current-pressure curve of the box is calculated by ) / m–B_p(∑Xi) / m;

[0046] The least squares method is used based on the formula B_q=[∑(Xi Yi) q )-(∑Xi ∑Yi q ) / m] / [∑Xi 2 -(∑Xi) 2 The intercept B_q of the valve body current-pressure curve is calculated from / m];

[0047] The Yi q This represents the valve body pressure value corresponding to the i-th test current point;

[0048] The least squares method is used based on the formula K_q=(∑Yi) q The slope value K_q of the valve body current-pressure curve is calculated by ) / m–B_q(∑Xi) / m.

[0049] Optionally, in the above-mentioned gearbox pressure-current characteristic verification device, the pressure value acquisition unit, when acquiring the valve body pressure value and gearbox pressure value corresponding to m test current points, is specifically used for:

[0050] Obtain the valve body pressure value and the chamber pressure value corresponding to m equally spaced test current points.

[0051] A transmission pressure-current characteristic verification device includes: a memory and a processor;

[0052] The memory is used to store programs;

[0053] The processor is configured to execute the program to implement the various steps of the gearbox pressure-current characteristic verification method as described in any of the preceding claims.

[0054] Based on the above technical solution, the solution provided in this embodiment of the invention, after determining m test current points, obtains the valve body pressure value and the housing pressure value corresponding to each test current point, and then calculates the slope and intercept of the housing current-pressure curve and the valve body current-pressure curve based on the valve body pressure value and the housing pressure value corresponding to the test current point, respectively. Then, it is determined whether the slope and intercept of the housing current-pressure curve and the valve body current-pressure curve meet the preset constraint conditions. When the preset constraint conditions are met, it indicates that the valve body and the housing meet the design requirements. When the valve body and the housing are off the production line, the relevant test points are subjected to band testing. Attached Figure Description

[0055] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0056] Figure 1 A simplified diagram for standard PC verification;

[0057] Figure 2 This is a schematic flowchart of the gearbox pressure-current characteristic verification method disclosed in an embodiment of this application;

[0058] Figure 3 This is a schematic diagram of the gearbox pressure-current characteristic verification device disclosed in an embodiment of this application;

[0059] Figure 4 This is a schematic diagram of the structure of the gearbox pressure-current characteristic verification device disclosed in the embodiments of this application. Detailed Implementation

[0060] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0061] In this solution, to ensure the inherent pressure characteristics of the valve body and the housing (the housing and valve body refer to the gearbox housing and valve body) and enhance their matching degree, this application discloses a gearbox pressure-current characteristic verification method. This method, after obtaining the valve body pressure value and housing pressure value corresponding to each test current point, calculates the slope and intercept of the housing current-pressure curve and the valve body current-pressure curve based on the test current point, valve body pressure value, and housing pressure value. It then analyzes the slope and intercept of the housing current-pressure curve and the valve body current-pressure curve based on preset constraints. When the slope and intercept of the housing current-pressure curve and the valve body current-pressure curve satisfy the preset constraints, it indicates that the inherent hydraulic characteristics of the valve body and the housing, as well as the matching degree between them, meet the requirements.

[0062] For details, see Figure 2 The method for verifying the pressure-current characteristics of the transmission includes steps S101-S104.

[0063] Step S101: Obtain the valve body pressure value and the chamber pressure value corresponding to the m test current points.

[0064] In this solution, the value of m can be set by the user according to their needs. The more values ​​of m that can be configured, the more accurate the verification results will be. In this solution, m is a positive integer not less than 3, but it can also be 4, 5, 6 or other values. In this step, the values ​​of the m test current points can be set by the user according to their needs. In this solution, in order to improve the accuracy of the verification results, the values ​​of the m test current points can be distributed at equal intervals.

[0065] Step S102: Based on the valve body pressure value and the chamber pressure value corresponding to the m test current points, calculate the slope and intercept of the chamber current-pressure curve and the valve body current-pressure curve, respectively.

[0066] In the technical solution disclosed in this application, after determining the valve body pressure value and the chamber pressure value corresponding to m test current points, the valve body current-pressure curve and the chamber current-pressure curve can be determined based on the m test current points and their corresponding valve body pressure values. After constructing the valve body current-pressure curve and the chamber current-pressure curve, the slope and intercept of these two curves can be further determined. Of course, the slope and intercept of the chamber current-pressure curve and the valve body current-pressure curve can also be directly calculated based on the valve body pressure value and the chamber pressure value corresponding to the m test current points.

[0067] Step S103: Determine whether the slope and intercept of the box current-pressure curve and the valve current-pressure curve both meet the preset constraint conditions.

[0068] In this solution, pre-configured constraints are used to ensure the hydraulic characteristics of the valve body and housing, as well as the matching degree between them. When the slope and intercept of the housing current-pressure curve and the valve body current-pressure curve meet these preset constraints, it indicates that the hydraulic characteristics of the valve body and housing meet the design requirements, and the matching degree between them is within a reasonable range. When one or more of the preset constraints are not met, a warning message corresponding to the unmet condition is output.

[0069] Step S104: When all preset conditions are met, when the valve body is detected to be offline, the valve body pressure value corresponding to the m test current points is subjected to band assessment, and when the box is detected to be offline, the box pressure value corresponding to the m test current points is subjected to band assessment.

[0070] In this scheme, when the slope and intercept of the current-pressure curve of the housing and the current-pressure curve of the valve body both meet the preset constraints, when the valve body is offline, the relevant test points are subjected to band testing, and when the housing is offline, the test points corresponding to the same current are subjected to band testing. Specifically, the testing method can be referred to the existing scheme, and this application does not limit it. The above scheme disclosed in this application is only for selecting qualified and mutually matched housings and valve bodies.

[0071] In the technical solution disclosed in the above embodiments of this application, after determining m test current points, the valve body pressure value and the housing pressure value corresponding to each test current point are obtained. Then, based on the valve body pressure value and the housing pressure value corresponding to the test current point, the slope and intercept of the housing current-pressure curve and the valve body current-pressure curve are calculated respectively. Then, it is determined whether the slope and intercept of the housing current-pressure curve and the valve body current-pressure curve meet the preset constraint conditions. When the preset constraint conditions are met, it indicates that the valve body and the housing meet the design requirements. When the valve body and the housing are off the production line, the relevant test points are subjected to band testing.

[0072] In another embodiment of the technical solution disclosed in this application, the specific content of the preset constraint conditions is also disclosed. Specifically, determining whether the slope and intercept of the box current-pressure curve and the valve current-pressure curve both satisfy the preset constraint conditions may include:

[0073] Determine whether the slope of the current-pressure curve of the enclosure is within a first preset slope range, which can be set by the user according to their needs;

[0074] Determine whether the intercept of the current-pressure curve of the enclosure is within the first preset intercept range. The first preset intercept range can be set by the user according to their needs.

[0075] Determine whether the slope of the valve body current-pressure curve is within a second preset slope range; the second preset slope range can be set by the user according to their needs.

[0076] Determine whether the intercept of the valve body current-pressure curve is within the second preset intercept range; the second preset intercept range can be set by the user according to their needs.

[0077] Determine whether the slope difference between the housing current-pressure curve and the valve body current-pressure curve is within a preset slope difference range; the preset slope difference range can be set by the user according to their needs.

[0078] Determine whether the intercept difference between the current-pressure curve of the housing and the current-pressure curve of the valve is within the preset intercept difference range. The preset intercept difference range can be set by the user according to their needs.

[0079] In the technical solution disclosed in this application, when calculating the slope and intercept of the box current-pressure curve and the valve current-pressure curve based on the valve body pressure value and the box pressure value corresponding to the m test current points, the slope and intercept can be calculated according to any of the existing technologies. For example, in this solution, in order to ensure the reliability of the calculation results, the least squares method can be used to calculate the slope and intercept of the box current-pressure curve and the valve current-pressure curve based on the valve body pressure value and the box pressure value corresponding to the m test current points.

[0080] This application also discloses the specific process of using the least squares method to calculate the slope and intercept of the chamber current-pressure curve and the valve body current-pressure curve based on the valve body pressure value and chamber pressure value corresponding to the m test current points:

[0081] The least squares method is used based on the formula B_p=[∑(Xi Yi) p )-(∑Xi ∑Yi p ) / m] / [∑Xi 2 -(∑Xi) 2 The intercept B_p of the current-pressure curve of the enclosure is calculated by / m];

[0082] Where i is a positive integer not greater than m, Xi represents the current value at the i-th test current point, and Yi p This represents the chamber pressure value corresponding to the i-th test current point;

[0083] The least squares method is used based on the formula K_p=(∑Yi) p The slope value K_p of the current-pressure curve of the box is calculated by ) / m–B_p(∑Xi) / m;

[0084] The least squares method is used based on the formula B_q=[∑(Xi Yi) q )-(∑Xi ∑Yi q ) / m] / [∑Xi 2 -(∑Xi) 2 The intercept B_q of the valve body current-pressure curve is calculated from / m];

[0085] The Yi q This represents the valve body pressure value corresponding to the i-th test current point;

[0086] The least squares method is used based on the formula K_q=(∑Yi) q The slope value K_q of the valve body current-pressure curve is calculated by ) / m–B_q(∑Xi) / m.

[0087] As can be seen from the above scheme, this invention achieves self-verification and correlation verification between the transmission housing PC (pressure-current) and valve body PC by utilizing the characteristics obtained from hydraulic tests. For the actual pressure-current characteristics tested on the valve body and housing, the slope and intercept of the characteristic points in the linear region of the PC are calculated using a least-squares algorithm. Based on the slope and intercept, its own characteristics are verified. Therefore, according to its design requirements, the PC characteristics tested before the transmission line are completed are verified to ensure they meet the transmission design and assembly requirements, thereby improving the consistency of the completed transmission. This verification method is applicable to any traditional gasoline vehicle or hybrid vehicle equipped with an automatic transmission.

[0088] This embodiment discloses a gearbox pressure-current characteristic verification device. For the specific working content of each unit in the device, please refer to the above method embodiment.

[0089] The transmission pressure-current characteristic verification device provided in the embodiments of the present invention is described below. The transmission pressure-current characteristic verification device described below and the transmission pressure-current characteristic verification method described above can be referred to in correspondence with each other.

[0090] For details, see Figure 3 The gearbox pressure-current characteristic verification device disclosed in this application may include: a pressure value acquisition unit A, a slope and intercept calculation unit B, a constraint condition judgment unit C, and an assessment unit D.

[0091] Pressure value acquisition unit A is used to acquire valve body pressure values ​​and chamber pressure values ​​corresponding to m test current points, where m is a positive integer not less than 3;

[0092] Slope and intercept calculation unit B is used to calculate the slope and intercept of the box current-pressure curve and the valve current-pressure curve respectively based on the valve body pressure value and the box pressure value corresponding to the m test current points.

[0093] The constraint condition judgment unit C is used to determine whether the slope and intercept of the box current-pressure curve and the valve current-pressure curve both meet the preset constraint conditions.

[0094] The assessment unit D is used to perform band assessment on the valve body pressure values ​​corresponding to m test current points when the valve body is detected to be offline, and to perform band assessment on the box pressure values ​​corresponding to m test current points when the box body is detected to be offline, provided that all preset conditions are met.

[0095] Corresponding to the above method, the constraint condition judgment unit C, when judging whether the slope and intercept of the box current-pressure curve and the valve current-pressure curve both meet the preset constraint conditions, is specifically used for:

[0096] Determine whether the slope of the current-pressure curve of the enclosure is within the first preset slope range;

[0097] Determine whether the intercept of the current-pressure curve of the enclosure is within the first preset intercept range;

[0098] Determine whether the slope of the valve body current-pressure curve is within the second preset slope range;

[0099] Determine whether the intercept of the valve body current-pressure curve is within the second preset intercept range;

[0100] Determine whether the slope difference between the box current-pressure curve and the valve current-pressure curve is within a preset slope difference range;

[0101] Determine whether the intercept difference between the current-pressure curve of the housing and the current-pressure curve of the valve is within the preset intercept difference range.

[0102] Corresponding to the above method, the slope and intercept calculation unit B, when calculating the slope and intercept of the box current-pressure curve and the valve current-pressure curve based on the valve body pressure value and the box pressure value corresponding to the m test current points, is specifically used for:

[0103] The least squares method is used based on the formula B_p=[∑(Xi Yi) p )-(∑Xi ∑Yi p ) / m] / [∑Xi 2 -(∑Xi) 2 The intercept B_p of the current-pressure curve of the enclosure is calculated by / m];

[0104] Where i is a positive integer not greater than m, Xi represents the current value at the i-th test current point, and Yi p This represents the chamber pressure value corresponding to the i-th test current point;

[0105] The least squares method is used based on the formula K_p=(∑Yi) p The slope value K_p of the current-pressure curve of the box is calculated by ) / m–B_p(∑Xi) / m;

[0106] The least squares method is used based on the formula B_q=[∑(Xi Yi) q )-(∑Xi ∑Yi q ) / m] / [∑Xi 2 -(∑Xi) 2 The intercept B_q of the valve body current-pressure curve is calculated from / m];

[0107] The Yi q This represents the valve body pressure value corresponding to the i-th test current point;

[0108] The least squares method is used based on the formula K_q=(∑Yi) q The slope value K_q of the valve body current-pressure curve is calculated by ) / m–B_q(∑Xi) / m.

[0109] Corresponding to the above method, when acquiring the valve body pressure value and the housing pressure value corresponding to m test current points, the pressure value acquisition unit A is specifically used for:

[0110] Obtain the valve body pressure value and the chamber pressure value corresponding to m equally spaced test current points.

[0111] Figure 4 The hardware structure diagram of the gearbox pressure-current characteristic verification device provided in this embodiment of the invention is shown below. Figure 4 As shown, it may include: at least one processor 100, at least one communication interface 200, at least one memory 300 and at least one communication bus 400;

[0112] In this embodiment of the invention, the number of processor 100, communication interface 200, memory 300, and communication bus 400 is at least one, and the processor 100, communication interface 200, and memory 300 communicate with each other through communication bus 400; obviously, Figure 4 The communication connections shown for the processor 100, communication interface 200, memory 300, and communication bus 400 are optional.

[0113] Optionally, the communication interface 200 can be an interface of a communication module, such as the interface of a GSM module;

[0114] Processor 100 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention.

[0115] The memory 300 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0116] Specifically, processor 100 is used for:

[0117] Obtain the valve body pressure value and the chamber pressure value corresponding to m test current points, where m is a positive integer not less than 3;

[0118] Based on the valve body pressure value and the chamber pressure value corresponding to the m test current points, calculate the slope and intercept of the chamber current-pressure curve and the valve body current-pressure curve respectively.

[0119] Determine whether the slope and intercept of the current-pressure curve of the housing and the current-pressure curve of the valve both meet the preset constraint conditions.

[0120] When all preset conditions are met, when the valve body is detected to be offline, the valve body pressure values ​​corresponding to m test current points are subjected to band assessment, and when the housing is detected to be offline, the housing pressure values ​​corresponding to m test current points are subjected to band assessment.

[0121] For ease of description, the above system is described by dividing it into various modules based on their functions. Of course, in implementing this invention, the functions of each module can be implemented in one or more software and / or hardware components.

[0122] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and relevant parts can be referred to the descriptions in the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. 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 modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0123] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0124] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0125] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0126] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily 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 invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for verifying the pressure-current characteristics of a transmission, characterized in that, include: Obtain the valve body pressure value and the chamber pressure value corresponding to m test current points, where m is a positive integer not less than 3; The least squares method is used to calculate the slope and intercept of the box current-pressure curve and the valve current-pressure curve based on the valve body pressure value and the box pressure value corresponding to the m test current points, respectively. Determine whether the slope and intercept of the current-pressure curve of the housing and the current-pressure curve of the valve both meet the preset constraint conditions. When all preset conditions are met, when the valve body is detected to be offline, the valve body pressure values ​​corresponding to m test current points are subjected to band assessment, and when the housing is detected to be offline, the housing pressure values ​​corresponding to m test current points are subjected to band assessment; the band assessment is an assessment of whether the pressure values ​​of the test points are within the preset qualified range.

2. The method for verifying the pressure-current characteristics of a transmission according to claim 1, characterized in that, Determine whether the slope and intercept of the box current-pressure curve and the valve current-pressure curve both meet preset constraints, including: Determine whether the slope of the current-pressure curve of the enclosure is within the first preset slope range; Determine whether the intercept of the current-pressure curve of the enclosure is within the first preset intercept range; Determine whether the slope of the valve body current-pressure curve is within the second preset slope range; Determine whether the intercept of the valve body current-pressure curve is within the second preset intercept range; Determine whether the slope difference between the box current-pressure curve and the valve current-pressure curve is within a preset slope difference range; Determine whether the intercept difference between the current-pressure curve of the housing and the current-pressure curve of the valve is within the preset intercept difference range.

3. The method for verifying the pressure-current characteristics of a transmission according to claim 1, characterized in that, Obtain the valve body pressure value and the chamber pressure value corresponding to m test current points, including: Obtain the valve body pressure value and the chamber pressure value corresponding to m equally spaced test current points.

4. The method for verifying the pressure-current characteristics of a transmission according to claim 1, characterized in that, Using the least squares method, based on the valve body pressure values ​​and chamber pressure values ​​corresponding to the m test current points, the slope and intercept of the chamber current-pressure curve and the valve body current-pressure curve are calculated respectively, including: The least squares method is used based on the formula B_p = [∑(Xi Yi p ) - (∑Xi ∑Yi p ) / m] / [∑Xi 2 - (∑Xi) 2 The intercept B_p of the current-pressure curve of the enclosure is calculated by [ / m]. Where i is a positive integer not greater than m, Xi represents the current value at the i-th test current point, and Yi p This represents the chamber pressure value corresponding to the i-th test current point; The least squares method is used based on the formula K_p = (∑Yi) p The slope value K_p of the current-pressure curve of the box is calculated by taking the curve as follows: ) / m – B_p(∑Xi) / m. The least squares method is used based on the formula B_q = [∑(Xi Yi q ) - (∑Xi ∑Yi q ) / m] / [∑Xi 2 - (∑Xi) 2 The intercept B_q of the valve body current-pressure curve is calculated by [ / m]. The Yi q This represents the valve body pressure value corresponding to the i-th test current point; The least squares method is used based on the formula K_q= (∑Yi) q The slope value K_q of the valve body current-pressure curve is calculated by ) / m – B_q(∑Xi) / m.

5. A transmission pressure-current characteristic verification device, characterized in that, include: The pressure value acquisition unit is used to acquire the valve body pressure value and the box pressure value corresponding to m test current points, where m is a positive integer not less than 3; The slope and intercept calculation unit is used to calculate the slope and intercept of the box current-pressure curve and the valve current-pressure curve respectively based on the valve body pressure value and the box pressure value corresponding to the m test current points using the least squares method. The constraint condition judgment unit is used to determine whether the slope and intercept of the box current-pressure curve and the valve current-pressure curve both meet the preset constraint conditions. The assessment unit is used to perform band assessment on the valve body pressure values ​​corresponding to m test current points when the valve body is detected to be offline, and to perform band assessment on the box pressure values ​​corresponding to m test current points when the box body is detected to be offline; the band assessment is an assessment of whether the pressure values ​​of the test points are within the preset qualified range.

6. The gearbox pressure-current characteristic verification device according to claim 5, characterized in that, When determining whether the slope and intercept of the box current-pressure curve and the valve current-pressure curve both meet the preset constraint conditions, the constraint condition judgment unit is specifically used for: Determine whether the slope of the current-pressure curve of the enclosure is within the first preset slope range; Determine whether the intercept of the current-pressure curve of the enclosure is within the first preset intercept range; Determine whether the slope of the valve body current-pressure curve is within the second preset slope range; Determine whether the intercept of the valve body current-pressure curve is within the second preset intercept range; Determine whether the slope difference between the box current-pressure curve and the valve current-pressure curve is within a preset slope difference range; Determine whether the intercept difference between the current-pressure curve of the housing and the current-pressure curve of the valve is within the preset intercept difference range.

7. The gearbox pressure-current characteristic verification device according to claim 5, characterized in that, The slope and intercept calculation unit, when calculating the slope and intercept of the chamber current-pressure curve and the valve current-pressure curve based on the valve body pressure value and chamber pressure value corresponding to the m test current points, is specifically used for: The least squares method is used based on the formula B_p = [∑(Xi Yi p ) - (∑Xi ∑Yi p ) / m] / [∑Xi 2 - (∑Xi) 2 The intercept B_p of the current-pressure curve of the enclosure is calculated by [ / m]. Where i is a positive integer not greater than m, Xi represents the current value at the i-th test current point, and Yi p This represents the chamber pressure value corresponding to the i-th test current point; The least squares method is used based on the formula K_p = (∑Yi) p The slope value K_p of the current-pressure curve of the box is calculated by taking the curve as follows: ) / m – B_p(∑Xi) / m. The least squares method is used based on the formula B_q = [∑(Xi Yi q ) - (∑Xi ∑Yi q ) / m] / [∑Xi 2 - (∑Xi) 2 The intercept B_q of the valve body current-pressure curve is calculated by [ / m]. The Yi q This represents the valve body pressure value corresponding to the i-th test current point; The least squares method is used based on the formula K_q= (∑Yi) q The slope value K_q of the valve body current-pressure curve is calculated by ) / m – B_q(∑Xi) / m.

8. The gearbox pressure-current characteristic verification device according to claim 5, characterized in that, When acquiring the valve body pressure value and the housing pressure value corresponding to m test current points, the pressure value acquisition unit is specifically used for: Obtain the valve body pressure value and the chamber pressure value corresponding to m equally spaced test current points.

9. A gearbox pressure-current characteristic verification device, characterized in that, include: Memory and processor; The memory is used to store programs; The processor is used to execute the program to implement each step of the gearbox pressure-current characteristic verification method as described in any one of claims 1-4.

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