A vehicle transmission main oil pressure correction method, device, system and medium

Abstract

The application provides a vehicle transmission main oil pressure correction method, device, system and medium. The method comprises the following steps: when the absolute value of the difference between the current measured value of the vehicle transmission main oil pressure and the target value of the vehicle transmission main oil pressure is less than or equal to a preset threshold value, the current measured value of the vehicle transmission main oil pressure is taken as the current correction value of the vehicle transmission main oil pressure; and interpolation is performed by using an interpolation formula according to the current current of the vehicle transmission main oil pressure solenoid, the current measured value of the vehicle transmission main oil pressure, the pre-stored multiple currents of the vehicle transmission main oil pressure solenoid and the pre-stored multiple actual values of the vehicle transmission main oil pressure. The interpolation formula can make the actual main oil pressure of the vehicle transmission more accurately follow the target main oil pressure of the vehicle transmission, the actual main oil pressure of the vehicle transmission is accurately corrected, overcompensation of the main oil pressure is avoided, the efficiency of the vehicle transmission is improved, and the fuel consumption of the vehicle is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicle control, in particular to a vehicle transmission main oil pressure correction method, device, system and medium. BACKGROUND

[0002] The transmission hydraulic pump, as a vehicle power element, can convert the mechanical energy (such as torque and speed) input by the vehicle engine or electric motor into pressure energy (such as pressure and flow), and provide pressure oil for the vehicle execution element. In order to ensure the normal driving operation of the vehicle, the pressure of the vehicle main oil pressure cannot be less than the pressure requirement of the vehicle forward and reverse clutch, the hydraulic torque converter locking clutch, the driven pulley clamping force and the driving pulley clamping force.

[0003] Generally, for a transmission without a main oil pressure sensor, in order to ensure that each execution element has sufficient pressure, sufficient compensation is added based on the required pressure of each execution element. In addition to the compensation required by the hydraulic characteristics, additional compensation is also needed to ensure that the main oil pressure can provide sufficient pressure under any circumstances, and the transmission will not be damaged due to low execution element pressure, affecting the safety of the driver and passenger.

[0004] The traditional method of ensuring that each execution element of the vehicle has sufficient pressure is prone to excessive compensation, thereby affecting the efficiency of the transmission and the fuel consumption of the vehicle. SUMMARY

[0005] Therefore, the purpose of the present application is to provide a vehicle transmission main oil pressure correction method, device, system and medium, which can accurately correct the main oil pressure of the vehicle transmission, so that the actual pressure can more accurately follow the target pressure, improve the efficiency of the transmission, and reduce the fuel consumption of the vehicle.

[0006] To achieve the above purpose, the present application has the following technical solutions:

[0007] In a first aspect, the present application provides a vehicle transmission main oil pressure correction method, comprising:

[0008] obtaining the current current of the vehicle transmission main oil pressure solenoid, the current measurement value of the vehicle transmission main oil pressure, and the target value of the vehicle transmission main oil pressure corresponding to the current current of the vehicle transmission main oil pressure solenoid;

[0009] When the absolute value of the difference between the current measurement value of the vehicle transmission main oil pressure and the target value of the vehicle transmission main oil pressure is less than or equal to a preset threshold, the current measurement value of the vehicle transmission main oil pressure is taken as the current correction value of the vehicle transmission main oil pressure;

[0010] According to the current current of the vehicle transmission main oil pressure solenoid, the current measured value of the vehicle transmission main oil pressure, the pre-stored multiple currents of the vehicle transmission main oil pressure solenoid and the pre-stored multiple actual values of the vehicle transmission main oil pressure, interpolation is performed by using an interpolation formula to replace the pre-stored multiple actual values of the vehicle transmission main oil pressure with multiple main oil pressure correction values.

[0011] In a possible implementation, the method further includes:

[0012] When the absolute value of the difference between the current measured value of the vehicle transmission main oil pressure and the target value of the vehicle transmission main oil pressure is greater than the preset threshold value, determining the size of the current measured value of the vehicle transmission main oil pressure and the target value of the vehicle transmission main oil pressure;

[0013] When the current measured value of the vehicle transmission main oil pressure is greater than the target value of the vehicle transmission main oil pressure, adding a preset fixed value to the target value of the vehicle transmission main oil pressure as the current correction value of the vehicle transmission main oil pressure;

[0014] When the current measured value of the vehicle transmission main oil pressure is less than the target value of the vehicle transmission main oil pressure, subtracting the preset fixed value from the target value of the vehicle transmission main oil pressure as the current correction value of the vehicle transmission main oil pressure.

[0015] In a possible implementation, before the current current of the vehicle transmission main oil pressure solenoid, the current measured value of the vehicle transmission main oil pressure and the target value of the vehicle transmission main oil pressure corresponding to the current current of the vehicle transmission main oil pressure are acquired, the method further includes

[0016] Controlling the vehicle transmission oil temperature to be within a first preset range, controlling the vehicle throttle change amount to be within a second preset range, controlling the vehicle brake change amount to be within a third preset range, and controlling the vehicle speed ratio change amount to be within a fourth preset range.

[0017] In a possible implementation, the interpolation formula includes:

[0018] A Lagrange interpolation formula, a Newton interpolation formula, an Emirp interpolation formula or a spline interpolation formula.

[0019] In a second aspect, the embodiments of the present application provide a vehicle transmission main oil pressure correction device, including:

[0020] An acquisition unit is configured to acquire a current current of a vehicle transmission main oil pressure solenoid, a current measured value of a vehicle transmission main oil pressure and a target value of the vehicle transmission main oil pressure corresponding to the current current of the vehicle transmission main oil pressure solenoid.

[0021] The first correction unit is configured to correct the current measured value of the main oil pressure of the vehicle transmission as a current corrected value of the main oil pressure of the vehicle transmission when an absolute value of a difference between the current measured value of the main oil pressure of the vehicle transmission and the target value of the main oil pressure of the vehicle transmission is less than or equal to a preset threshold value.

[0022] The second correction unit is configured to replace the plurality of actual values of the main oil pressure of the vehicle transmission with a plurality of corrected values of the main oil pressure of the vehicle transmission by interpolation according to the current electric current of the main oil pressure solenoid of the vehicle transmission, the current measured value of the main oil pressure of the vehicle transmission, a plurality of pre-stored electric currents of the main oil pressure solenoid of the vehicle transmission, and a plurality of pre-stored actual values of the main oil pressure of the vehicle transmission.

[0023] In a possible implementation, the device further includes:

[0024] The judging unit is configured to judge the size of the current measured value of the main oil pressure of the vehicle transmission and the target value of the main oil pressure of the vehicle transmission when an absolute value of a difference between the current measured value of the main oil pressure of the vehicle transmission and the target value of the main oil pressure of the vehicle transmission is greater than the preset threshold value.

[0025] The first calculation unit is configured to add a preset fixed value to the target value of the main oil pressure of the vehicle transmission as the current corrected value of the main oil pressure of the vehicle transmission when the current measured value of the main oil pressure of the vehicle transmission is greater than the target value of the main oil pressure of the vehicle transmission.

[0026] The second calculation unit is configured to subtract the preset fixed value from the target value of the main oil pressure of the vehicle transmission as the current corrected value of the main oil pressure of the vehicle transmission when the current measured value of the main oil pressure of the vehicle transmission is less than the target value of the main oil pressure of the vehicle transmission.

[0027] In a possible implementation, the device further includes:

[0028] The control unit is configured to control the oil temperature of the vehicle transmission within a first preset range, control the change amount of the vehicle throttle within a second preset range, control the change amount of the vehicle brake within a third preset range, and control the change amount of the vehicle speed ratio within a fourth preset range.

[0029] In a possible implementation, the interpolation formula includes:

[0030] A Lagrange interpolation formula, a Newton interpolation formula, an Emirp interpolation formula, or a spline interpolation formula.

[0031] In a third aspect, the embodiments of the present application further provide a vehicle transmission main oil pressure correction system, including:

[0032] The memory is configured to store a computer program.

[0033] The processor is configured to implement the steps of the vehicle transmission main oil pressure correction method when the computer program is executed.

[0034] In a fourth aspect, the embodiments of the present application further provide a computer readable medium, and the computer readable medium stores a computer program. The computer program is executed by a processor to implement the steps of the vehicle transmission main oil pressure correction method.

[0035] Compared with the prior art, the embodiments of the present application have the following advantages:

[0036] The embodiments of the present application provide a vehicle transmission main oil pressure correction method, device, system and storage medium. The method comprises the following steps: acquiring a current current of a vehicle transmission main oil pressure electromagnetic valve, a current measured value of the vehicle transmission main oil pressure and a target value of the vehicle transmission main oil pressure corresponding to the current current of the vehicle transmission main oil pressure electromagnetic valve; when an absolute value of a difference between the current measured value of the vehicle transmission main oil pressure and the target value of the vehicle transmission main oil pressure is less than or equal to a preset threshold value, taking the current measured value of the vehicle transmission main oil pressure as a current correction value of the vehicle transmission main oil pressure, and using an interpolation formula to perform interpolation according to the current current of the vehicle transmission main oil pressure electromagnetic valve, the current measured value of the vehicle transmission main oil pressure, a plurality of pre-stored currents of the vehicle transmission main oil pressure electromagnetic valve and a plurality of pre-stored actual values of the vehicle transmission main oil pressure, so as to replace the plurality of pre-stored actual values of the vehicle transmission main oil pressure with a plurality of main oil pressure correction values. Therefore, the actual main oil pressure of the vehicle transmission can more accurately follow the target main oil pressure of the vehicle transmission by using the interpolation formula, the actual main oil pressure of the vehicle transmission is accurately corrected, overcompensation of the main oil pressure is avoided, the efficiency of the vehicle transmission is improved, and the fuel consumption of the vehicle is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0038] Figure 1 A flow chart of a vehicle transmission main oil pressure correction method provided by the embodiments of the present application is shown;

[0039] Figure 2 A curve diagram of a vehicle transmission main oil pressure electromagnetic valve current and a correction voltage before correction provided by the embodiments of the present application is shown;

[0040] Figure 3A curve diagram of a vehicle transmission main oil pressure electromagnetic valve current and a voltage before correction and a voltage after correction provided by an embodiment of the present application is shown.

[0041] Figure 4 A schematic diagram of a vehicle transmission main oil pressure correction device provided by an embodiment of the present application is shown. DETAILED DESCRIPTION

[0042] To make the above objectives, features and advantages of the present application more apparent, a detailed description of the specific embodiments of the present application is given below with reference to the accompanying drawings.

[0043] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in other ways different from those described herein without departing from the scope of the present application, and those skilled in the art can make similar extensions without departing from the scope of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0044] As described in the background, the applicant has found that, as a vehicle power element, the transmission hydraulic pump can convert the mechanical energy (such as torque and speed) input by the vehicle engine or electric motor into pressure energy (such as pressure and flow), and provide pressure oil for the vehicle execution element. In order to ensure the normal driving operation of the vehicle, the pressure of the vehicle main oil pressure cannot be less than the pressure requirement of the vehicle forward and reverse clutch, the hydraulic torque converter locking clutch, the driven pulley clamping force, and the driving pulley clamping force. A certain compensation needs to be added on the basis of the pressure requirement of each execution element. If the compensation is too small, the pressure of each execution element will be too low. If the compensation is too large, the efficiency will be reduced, and the fuel consumption will be affected.

[0045] Generally, for a transmission without a main oil pressure sensor, in order to ensure that each execution element has sufficient pressure, a sufficient compensation is added on the basis of the pressure requirement of each execution element. In addition to the compensation required by the hydraulic characteristics, additional compensation is needed to compensate for the differences in manufacturing and after a long period of use, so as to ensure that the main oil pressure can provide sufficient pressure under any circumstances, and the transmission will not be damaged due to low execution element pressure, and the safety of the driver and passengers will not be affected.

[0046] The traditional method of ensuring that each execution element of the vehicle has sufficient pressure is prone to excessive compensation, thereby affecting the efficiency of the transmission and the fuel consumption of the vehicle.

[0047] To solve the above technical problems, the application provides a vehicle transmission main oil pressure correction method, device, system and storage medium, the method comprising: obtaining a vehicle transmission main oil pressure solenoid current, a vehicle transmission main oil pressure current measurement value and a vehicle transmission main oil pressure target value corresponding to the vehicle transmission main oil pressure solenoid current; when the absolute value of the difference between the vehicle transmission main oil pressure current measurement value and the vehicle transmission main oil pressure target value is less than or equal to a preset threshold, taking the vehicle transmission main oil pressure current measurement value as a vehicle transmission main oil pressure current correction value, and using an interpolation formula to interpolate the vehicle transmission main oil pressure solenoid current, the vehicle transmission main oil pressure current measurement value, a pre-stored vehicle transmission main oil pressure solenoid current and a pre-stored vehicle transmission main oil pressure actual value, so as to replace the pre-stored vehicle transmission main oil pressure actual value with a plurality of main oil pressure correction values, so that the actual main oil pressure of the vehicle transmission can more accurately follow the target main oil pressure of the vehicle transmission, the actual main oil pressure of the vehicle transmission is accurately corrected, so as to avoid overcompensation of the main oil pressure, improve the efficiency of the vehicle transmission and reduce the fuel consumption of the vehicle.

[0048] Exemplary method

[0049] Referring to Figure 1 The figure is a flowchart of a vehicle transmission main oil pressure correction method provided by the application, comprising:

[0050] S101: obtaining a vehicle transmission main oil pressure solenoid current, a vehicle transmission main oil pressure current measurement value and a vehicle transmission main oil pressure target value corresponding to the vehicle transmission main oil pressure solenoid current.

[0051] S102: when the absolute value of the difference between the vehicle transmission main oil pressure current measurement value and the vehicle transmission main oil pressure target value is less than or equal to a preset threshold, taking the vehicle transmission main oil pressure current measurement value as a vehicle transmission main oil pressure current correction value.

[0052] In the application, the vehicle transmission main oil pressure solenoid current c and the vehicle transmission main oil pressure current measurement value p_actual can be measured, and the vehicle transmission main oil pressure target value p_table corresponding to the vehicle transmission main oil pressure solenoid current c can be obtained according to the vehicle transmission main oil pressure solenoid current c and the vehicle transmission current-voltage table.

[0053] When the absolute value of the difference between the current measured value p_actual of the main oil pressure of the vehicle transmission and the target value p_table of the main oil pressure of the vehicle transmission is less than or equal to a preset threshold, i.e., |p_actual-p_table| is less than or equal to the preset threshold, it indicates that the difference between the current actual value and the target value of the main oil pressure of the vehicle transmission is not large, and the current measured value of the vehicle transmission can be used to correct the pressure corresponding to the current of the electromagnetic valve of the main oil pressure of the vehicle transmission, which is simple and convenient, does not need to perform too much calculation, and saves the operation resource.

[0054] Specifically, the current measured value p_actual of the main oil pressure of the vehicle transmission can be taken as the current corrected value p of the main oil pressure of the vehicle transmission, i.e., p=p_actual.

[0055] In a possible implementation, when the absolute value of the difference between the current measured value p_actual of the main oil pressure of the vehicle transmission and the target value p_table of the main oil pressure of the vehicle transmission is greater than the preset threshold, i.e., |p_actual-p_table| is greater than the preset threshold, the size of the current measured value p_actual of the main oil pressure of the vehicle transmission and the target value p_table of the main oil pressure of the vehicle transmission can be determined.

[0056] When the current measured value p_actual of the main oil pressure of the vehicle transmission is greater than the target value p_table of the main oil pressure of the vehicle transmission, the target value p_table of the main oil pressure of the vehicle transmission can be added by a preset fixed value to obtain the current corrected value p of the main oil pressure of the vehicle transmission.

[0057] When the current measured value p_actual of the main oil pressure of the vehicle transmission is less than the target value p_table of the main oil pressure of the vehicle transmission, the target value p_table of the main oil pressure of the vehicle transmission can be subtracted by a preset fixed value to obtain the current corrected value p of the main oil pressure of the vehicle transmission.

[0058] That is, in order to avoid that the adaptive step of the correction method provided in the embodiments of the present application is too large and prevent oscillation, a preset fixed value can be added or subtracted on the basis of the target value p_table of the main oil pressure of the vehicle transmission when the absolute value of the difference between the current measured value p_actual of the main oil pressure of the vehicle transmission and the target value p_table of the main oil pressure of the vehicle transmission is large, so as to avoid oscillation and make the correction more stable.

[0059] In one possible implementation, to ensure the corrective method operates normally, before acquiring the current c of the vehicle transmission main oil pressure solenoid valve, the current measured value p_actual of the vehicle transmission main oil pressure, and the target value p_table of the vehicle transmission main oil pressure corresponding to the current current of the vehicle transmission main oil pressure solenoid valve, the vehicle transmission oil temperature can be controlled within a first preset range (e.g., 75°C to 95°C), the vehicle throttle change can be controlled within a second preset range, the vehicle brake change can be controlled within a third preset range, and the vehicle speed ratio change can be controlled within a fourth preset range, so as to ensure the normal implementation of the method in this application embodiment.

[0060] Furthermore, in order to ensure the normal implementation of the method in this application embodiment, the vehicle transmission needs to be running normally without any faults, and the various control nodes of the vehicle (such as the Engine Management System and the Anti-lock Brake System) need not have a speed ratio limitation requirement on the TCU (Transmission Control Unit). In addition, the pressure and flow requirements of the vehicle's forward and reverse clutches, torque converter lock-up clutches, driven pulley clamping force, and driving pulley clamping force are within a certain range, and the changes in the vehicle transmission main oil pressure feedback control current are within a certain range.

[0061] S103: Based on the current current of the vehicle transmission main oil pressure solenoid valve, the current measured value of the vehicle transmission main oil pressure, multiple pre-stored currents of the vehicle transmission main oil pressure solenoid valve, and multiple pre-stored actual values ​​of the vehicle transmission main oil pressure, interpolation is performed using an interpolation formula to replace the multiple pre-stored actual values ​​of the vehicle transmission main oil pressure with multiple main oil pressure correction values.

[0062] In this embodiment, to further correct the main hydraulic pressure corresponding to each current of the vehicle transmission main hydraulic pressure solenoid valve, multiple pre-stored currents of the vehicle transmission main hydraulic pressure solenoid valve and multiple pre-stored actual values ​​of the vehicle transmission main hydraulic pressure can be obtained first. Optionally, these values ​​can be stored in an electrically erasable programmable read-only memory (EEPROM).

[0063] See Table 1 and Figure 2 As shown, this represents multiple currents stored in the vehicle transmission main hydraulic pressure solenoid valve and multiple actual values ​​of the pre-stored vehicle transmission main hydraulic pressure.

[0064] Current (mA) c1 c2 c3 c4 c5 c6 Pressure (kpa) p1 p2 p3 p4 p5 p6

[0065] Table 1

[0066] p1 to p6 in Table 1 are arranged in ascending order, and c1 to c6 are arranged in descending order.

[0067] Then, interpolation is performed by using an interpolation formula to replace the pre-stored vehicle transmission main oil pressure actual values with main oil pressure correction values.

[0068] Optionally, the interpolation formula can include a Lagrange interpolation formula, a Newton interpolation formula, an Hermite interpolation formula, or a spline interpolation formula.

[0069] For example, when the vehicle transmission main oil pressure solenoid current c > c1, in order to correct p1, a fixed value can be added to or subtracted from p1 according to the target value corresponding to c1 to obtain a correction value p1'.

[0070] If the range of the main oil pressure solenoid current is c1 ≥ c > c2, interpolation is performed by using the interpolation formula according to [c1 c c3 c4 c5] and [p1 p p3 p4 p5] and substituting c2 to correct p2 to obtain p2'.

[0071] If the range of the main oil pressure solenoid current is c2 ≥ c > c5, two adjacent current points are deleted, c and other current points are added, and interpolation is performed by using the interpolation formula to correct the pressures corresponding to the two adjacent current points.

[0072] If the range of the main oil pressure solenoid current is c5 ≥ c > c6, interpolation is performed by using the interpolation formula according to [c2 c3 c4 c c6] and [p2 p3 p4 pp6] and substituting c5 to calculate, and p5 is corrected to obtain p5'.

[0073] If the main oil pressure solenoid current c ≤ c6, in order to correct p6, a fixed value can be added to or subtracted from p6 according to the target value corresponding to c6 to obtain a correction value p6'.

[0074] Optionally, when the interpolation formula is a Newton interpolation formula, it can be a 4th order Newton interpolation polynomial. For example, c2 ≤ c < c3, the use of the 4th order Newton interpolation polynomial is illustrated.

[0075] Let x1 = c1, x2 = c, x3 = c4, x4 = c5, x5 = c6

[0076] y1 = p1, y2 = p, y3 = p4, y4 = p5, y5 = p6.

[0077] The respective mean differences in Table 2 are calculated.

[0078] xk f(xk) First order mean difference Second order mean difference Third order mean difference Fourth order mean difference x1 f(x1) x2 f(x2) f[x1,x2] x3 f(x3) f[x2,x3] f[x1,x2,x3] x4 f(x4) f[x3,x4] f[x2,x3,x4] f[x1,x2,x3,x4] x5 f(x5) f[x4,x5] f[x3,x4,x5] f[x2,x3,x4,x5] f[x1,x2,x3,x4,x5]

[0079] Specifically, for the calculation of the first order mean difference, Table 2 is as follows:

[0080]

[0081]

[0082]

[0083]

[0084] f[x1,x2], f[x2,x3], f[x3,x4] and f[x4,x5] reflect the oil pressure change corresponding to a certain current change, and from the perspective of hydraulic principle, its numerical size has an upper limit and a lower limit, so after the above preliminary calculation, the upper limit and the lower limit of the four first-order mean differences can be limited.

[0085] Calculation of second-order mean difference:

[0086]

[0087]

[0088]

[0089] Calculation of third-order mean difference

[0090]

[0091]

[0092] Calculation of fourth-order mean difference

[0093]

[0094] Thus, the Newton interpolation polynomial can be calculated by using the above calculated mean differences of each order, that is:

[0095] P4(x) = f(x1) + f[x1,x2](x-x1) + f[x1,x2,x3](x-x1)(x-x2) + f[x1,x2,x3,x4](x-x1)(x-x2)(x-x3) + f[x1,x2,x3,x4,x5](x-x1)(x-x2)(x-x3)(x-x4).

[0096] The Newton interpolation polynomial can be used to correct the pre-stored multiple actual values of the main oil pressure of the vehicle transmission one by one. For example, for p2, c2 can be substituted into the above Newton interpolation polynomial to obtain p2':

[0097] P4(c2) = f(x1) + f[x1,x2](c2-x1) + f[x1,x2,x3](c2-x1)(c2-x2) + f[x1,x2,x3,x4](c2-x1)(c2-x2)(c2-x3) + f[x1,x2,x3,x4,x5](c2-x1)(c2-x2)(c2-x3)(c2-x4)

[0098] For p3, c3 can be substituted into the above Newton interpolation polynomial to obtain p3':

[0099] P4(c3) = f(x1) + f[x1,x2](c3-x1) + f[x1,x2,x3](c3-x1)(c3-x2) + f[x1,x2,x3,x4](c3-x1)(c3-x2)(c3-x3) + f[x1,x2,x3,x4,x5](c3-x1)(c3-x2)(c3-x3)(c3-x4)

[0100] Thus, the pre-stored multiple actual values of the vehicle transmission main oil pressure can be replaced by multiple main oil pressure correction values, as shown in Figure 3 The solid line is the corresponding curve of the replaced main oil pressure correction value and the current, and the dashed line is the curve before replacement.

[0101] The embodiment of the present application provides a vehicle transmission main oil pressure correction method, which comprises the following steps: acquiring a current current of a vehicle transmission main oil pressure electromagnetic valve, a current measured value of the vehicle transmission main oil pressure and a target value of the vehicle transmission main oil pressure corresponding to the current current of the vehicle transmission main oil pressure electromagnetic valve; when an absolute value of a difference between the current measured value of the vehicle transmission main oil pressure and the target value of the vehicle transmission main oil pressure is less than or equal to a preset threshold value, taking the current measured value of the vehicle transmission main oil pressure as a current correction value of the vehicle transmission main oil pressure, and using an interpolation formula to perform interpolation according to the current current of the vehicle transmission main oil pressure electromagnetic valve, the current measured value of the vehicle transmission main oil pressure, pre-stored multiple currents of the vehicle transmission main oil pressure electromagnetic valve and pre-stored multiple actual values of the vehicle transmission main oil pressure, so as to replace the pre-stored multiple actual values of the vehicle transmission main oil pressure by multiple main oil pressure correction values. Thus, the actual main oil pressure of the vehicle transmission can more accurately follow the target main oil pressure of the vehicle transmission by using the interpolation formula, the actual main oil pressure of the vehicle transmission is accurately corrected, the overcompensation of the main oil pressure is avoided, the efficiency of the vehicle transmission is improved, and the fuel consumption of the vehicle is reduced.

[0102] Exemplary apparatus

[0103] As shown in Figure 4 The embodiment of the present application provides a vehicle transmission main oil pressure correction device, which comprises:

[0104] The acquisition unit 201 is configured to acquire a current current of a vehicle transmission main oil pressure solenoid, a current measured value of the vehicle transmission main oil pressure, and a target value of the vehicle transmission main oil pressure corresponding to the current current of the vehicle transmission main oil pressure solenoid.

[0105] The first correction unit 202 is configured to, when an absolute value of a difference between the current measured value of the vehicle transmission main oil pressure and the target value of the vehicle transmission main oil pressure is less than or equal to a preset threshold value, take the current measured value of the vehicle transmission main oil pressure as a current corrected value of the vehicle transmission main oil pressure.

[0106] The second correction unit 203 is configured to, according to the current current of the vehicle transmission main oil pressure solenoid, the current measured value of the vehicle transmission main oil pressure, a plurality of pre-stored currents of the vehicle transmission main oil pressure solenoid, and a plurality of pre-stored actual values of the vehicle transmission main oil pressure, perform interpolation by using an interpolation formula to replace the plurality of pre-stored actual values of the vehicle transmission main oil pressure with a plurality of corrected values of the main oil pressure.

[0107] In a possible implementation, the device further includes:

[0108] The judgment unit is configured to, when an absolute value of a difference between the current measured value of the vehicle transmission main oil pressure and the target value of the vehicle transmission main oil pressure is greater than the preset threshold value, judge magnitudes of the current measured value of the vehicle transmission main oil pressure and the target value of the vehicle transmission main oil pressure.

[0109] The first calculation unit is configured to, when the current measured value of the vehicle transmission main oil pressure is greater than the target value of the vehicle transmission main oil pressure, add a preset fixed value to the target value of the vehicle transmission main oil pressure as the current corrected value of the vehicle transmission main oil pressure.

[0110] The second calculation unit is configured to, when the current measured value of the vehicle transmission main oil pressure is less than the target value of the vehicle transmission main oil pressure, subtract the preset fixed value from the target value of the vehicle transmission main oil pressure as the current corrected value of the vehicle transmission main oil pressure.

[0111] In a possible implementation, the device further includes:

[0112] The control unit is configured to control the vehicle transmission oil temperature to be within a first preset range, control a vehicle throttle variation to be within a second preset range, control a vehicle brake variation to be within a third preset range, and control a vehicle speed ratio variation to be within a fourth preset range.

[0113] In a possible implementation, the interpolation formula includes:

[0114] A Lagrange interpolation formula, a Newton interpolation formula, an Emirp interpolation formula, or a spline interpolation formula.

[0115] On the basis of the above-mentioned embodiments, the embodiments of the present application further provide a vehicle transmission main oil pressure correction system, comprising:

[0116] a memory for storing a computer program;

[0117] a processor for executing the computer program to realize the steps of the vehicle transmission main oil pressure correction method.

[0118] On the basis of the above-mentioned embodiments, the embodiments of the present application further provide a computer readable medium, wherein the computer readable medium stores a computer program, and the computer program is executed by a processor to realize the steps of the vehicle transmission main oil pressure correction method.

[0119] The computer readable medium can include a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media capable of storing program codes.

[0120] Each of the embodiments in the specification is described in a progressive manner, and the same or similar parts of each of the embodiments can be referred to each other. Each of the embodiments mainly describes the difference from other embodiments. In particular, the device embodiments are described more simply because they are basically similar to the method embodiments, and the relevant parts can be referred to the part of the method embodiments.

[0121] The above-mentioned is only the preferred embodiments of the present application, although the present application has disclosed the above-mentioned preferred embodiments, however, it is not used to limit the present application. Any person skilled in the art, without departing from the scope of the technical scheme of the present application, can make many possible changes and modifications to the technical scheme of the present application by using the disclosed method and technical content, or modify the equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above-mentioned embodiments according to the technical essence of the present application, without departing from the content of the technical scheme of the present application, still belongs to the protection scope of the technical scheme of the present application.

Claims

1. A vehicle transmission main oil pressure correction method characterized by, The method comprises the following steps: acquiring a current current of a vehicle transmission main oil pressure electromagnetic valve, a current measured value of a vehicle transmission main oil pressure, and a target value of the vehicle transmission main oil pressure corresponding to the current current of the vehicle transmission main oil pressure electromagnetic valve; when an absolute value of a difference between the current measured value of the vehicle transmission main oil pressure and the target value of the vehicle transmission main oil pressure is less than or equal to a preset threshold value, taking the current measured value of the vehicle transmission main oil pressure as a current corrected value of the vehicle transmission main oil pressure; when the absolute value of the difference between the current measured value of the vehicle transmission main oil pressure and the target value of the vehicle transmission main oil pressure is greater than the preset threshold value, judging a size of the current measured value of the vehicle transmission main oil pressure and the target value of the vehicle transmission main oil pressure; when the current measured value of the vehicle transmission main oil pressure is greater than the target value of the vehicle transmission main oil pressure, taking the target value of the vehicle transmission main oil pressure plus a preset fixed value as the current corrected value of the vehicle transmission main oil pressure; when the current measured value of the vehicle transmission main oil pressure is less than the target value of the vehicle transmission main oil pressure, taking the target value of the vehicle transmission main oil pressure minus the preset fixed value as the current corrected value of the vehicle transmission main oil pressure; according to the current current of the vehicle transmission main oil pressure electromagnetic valve, the current measured value of the vehicle transmission main oil pressure, a plurality of pre-stored currents of the vehicle transmission main oil pressure electromagnetic valve, and a plurality of pre-stored actual values of the vehicle transmission main oil pressure, performing interpolation by using an interpolation formula to replace the plurality of pre-stored actual values of the vehicle transmission main oil pressure with a plurality of corrected values of the main oil pressure.

2. The method of claim 1, wherein, Before the steps of acquiring the current current of the vehicle transmission main oil pressure electromagnetic valve, the current measured value of the vehicle transmission main oil pressure, and the target value of the vehicle transmission main oil pressure corresponding to the current current of the vehicle transmission main oil pressure electromagnetic valve, the method further comprises the following steps: controlling a vehicle transmission oil temperature to be within a first preset range, controlling a vehicle accelerator change amount to be within a second preset range, controlling a vehicle brake change amount to be within a third preset range, and controlling a vehicle speed ratio change amount to be within a fourth preset range.

3. The method of claim 1, wherein, The interpolation formula comprises: a Lagrange interpolation formula, a Newton interpolation formula, an Emirp interpolation formula, or a spline interpolation formula.

4. A vehicle transmission main oil pressure correction device characterized by comprising: The method comprises the following steps: an acquisition unit is configured to acquire a current current of a vehicle transmission main oil pressure electromagnetic valve, a current measured value of a vehicle transmission main oil pressure, and a target value of the vehicle transmission main oil pressure corresponding to the current current of the vehicle transmission main oil pressure electromagnetic valve; a first correction unit is configured to, when an absolute value of a difference between the current measured value of the vehicle transmission main oil pressure and the target value of the vehicle transmission main oil pressure is less than or equal to a preset threshold value, take the current measured value of the vehicle transmission main oil pressure as a current corrected value of the vehicle transmission main oil pressure; a judgment unit is configured to, when the absolute value of the difference between the current measured value of the vehicle transmission main oil pressure and the target value of the vehicle transmission main oil pressure is greater than the preset threshold value, judge a size of the current measured value of the vehicle transmission main oil pressure and the target value of the vehicle transmission main oil pressure; The first calculation unit is configured to add a preset fixed value to the target value of the main oil pressure of the vehicle transmission as the current correction value of the main oil pressure of the vehicle transmission when the current measured value of the main oil pressure of the vehicle transmission is greater than the target value of the main oil pressure of the vehicle transmission. The second calculation unit is configured to subtract the preset fixed value from the target value of the main oil pressure of the vehicle transmission as the current correction value of the main oil pressure of the vehicle transmission when the current measured value of the main oil pressure of the vehicle transmission is less than the target value of the main oil pressure of the vehicle transmission. The second correction unit is configured to replace the plurality of actual values of the main oil pressure of the vehicle transmission with a plurality of correction values of the main oil pressure of the vehicle transmission by using an interpolation formula to interpolate according to the current current of the main oil pressure solenoid of the vehicle transmission, the current measured value of the main oil pressure of the vehicle transmission, a plurality of pre-stored currents of the main oil pressure solenoid of the vehicle transmission, and a plurality of pre-stored actual values of the main oil pressure of the vehicle transmission.

5. The apparatus of claim 4, wherein, Further comprising: The control unit is configured to control the vehicle transmission oil temperature to be within a first preset range, control the vehicle throttle change amount to be within a second preset range, control the vehicle brake change amount to be within a third preset range, and control the vehicle speed ratio change amount to be within a fourth preset range.

6. The apparatus of claim 4, wherein, The interpolation formula includes: The Lagrange interpolation formula, the Newton interpolation formula, the Hermite interpolation formula, or the spline interpolation formula.

7. A vehicle transmission main oil pressure correction system characterized by comprising: Comprise: The memory is configured to store a computer program. The processor is configured to execute the computer program to implement the steps of the vehicle transmission main oil pressure correction method according to any one of claims 1-3.

8. A computer readable medium characterized by The computer readable medium stores a computer program, and the computer program is executed by the processor to implement the steps of the vehicle transmission main oil pressure correction method according to any one of claims 1-3.

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