Control method and device for clutch oil pressure

Abstract

The application discloses a clutch oil pressure control method and device, and belongs to the technical field of gearbox clutch control. The method is applied to a gearbox controller. The method comprises the following steps: determining the torque of a first clutch according to a gear shifting instruction, wherein the first clutch is currently combined with a first input shaft, and a second clutch is currently separated from the first input shaft; and controlling the oil pressure of the first clutch to be in a target oil pressure interval based on the torque of the first clutch, so that the first clutch is separated from the first input shaft, and the second clutch is combined with the first input shaft. The method can improve the smoothness of vehicle gear shifting and reduce driving safety hazards.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transmission clutch control, and particularly relates to a clutch oil pressure control method and device. BACKGROUND

[0002] When the vehicle is running, the power of the engine is transmitted to the gears in the transmission through the clutch, and different speed ratios are achieved through different gear combinations. When shifting, the clutch realizes gear shifting through its separation or combination.

[0003] In the related art, a preset oil pressure value is directly used as the oil pressure of the second clutch and the first clutch, and the rotation speed of the input shaft connected with the clutch is controlled by controlling the oil pressure.

[0004] However, during the shifting process, the first clutch in the transmission may have an excessively high oil pressure, which causes the rotation speed of the input shaft connected with the clutch to fail to reach the target rotation speed, so that the transmission triggers the fault-tolerant shifting function. At this time, the first clutch is forced to reduce the oil pressure, enter the fault-tolerant shifting, and then enter the target gear, which greatly increases the shifting time and affects the smoothness of the vehicle shifting, thereby causing a driving safety hazard. SUMMARY

[0005] In view of this, the present application provides a clutch oil pressure control method and device, which can improve the smoothness of vehicle shifting and reduce driving safety hazards.

[0006] Specifically, the technical scheme includes the following:

[0007] In a first aspect, the present application provides a clutch oil pressure control method applied to a transmission controller, and the method comprises the following steps.

[0008] According to a shifting instruction, the torque of a first clutch is determined, wherein the first clutch is currently combined with a first input shaft, and a second clutch is currently separated from the first input shaft;

[0009] Based on the torque of the first clutch, the oil pressure of the first clutch is controlled to be in a target oil pressure range, so that the first clutch is separated from the first input shaft, and the second clutch is combined with the first input shaft.

[0010] In some embodiments, the step of controlling the oil pressure of the first clutch to be in the target oil pressure range, so that the first clutch is separated from the first input shaft, and the second clutch is combined with the first input shaft based on the torque of the first clutch comprises the following steps.

[0011] Based on the torque of the first clutch, the target oil pressure range is determined;

[0012] Based on the target oil pressure interval, control changes the oil pressure of the first clutch so that the first clutch is separated from the first input shaft and the second clutch is combined with the first input shaft.

[0013] In some embodiments, the target oil pressure interval can be obtained according to the following calculation formula:

[0014] The target oil pressure interval = (the torque of the first clutch × 1000 ÷ the effective radius of the clutch ÷ the effective number of clutch pieces ÷ the friction coefficient) × 10 ÷ the effective area of the clutch.

[0015] The target oil pressure interval = (the torque of the first clutch × 1000 ÷ the effective radius of the clutch ÷ the effective number of clutch pieces ÷ the friction coefficient) × 10 ÷ the effective area of the clutch.

[0016] Wherein, the torque of the first clutch is a variable.

[0017] In some embodiments, the control changes the oil pressure of the first clutch based on the target oil pressure interval includes:

[0018] Obtain the oil pressure self-adjusting time, the initial oil pressure, the first input shaft speed and the target speed;

[0019] Based on the oil pressure self-adjusting time, the first input shaft speed and the target speed, obtain the compensation oil pressure;

[0020] Based on the initial oil pressure and the target speed, change the oil pressure of the first clutch by controlling the compensation oil pressure.

[0021] In some embodiments, based on the oil pressure self-adjusting time, the first input shaft speed and the target speed, the compensation oil pressure includes:

[0022] Based on the first input shaft speed and the target speed, determine the speed difference;

[0023] Based on the speed difference and the oil pressure self-adjusting time, determine the compensation torque;

[0024] Based on the compensation torque, determine the compensation oil pressure.

[0025] In some embodiments, the compensation torque can be obtained according to the following calculation formula:

[0026] The compensation torque = the speed difference ÷ the oil pressure self-adjusting time × the moment of inertia.

[0027] In some embodiments, the target speed includes:

[0028] According to the shift instruction, determine the target gear;

[0029] Based on the target gear, determine the target speed ratio;

[0030] determine the target speed according to the output shaft speed and the target speed ratio.

[0031] In some embodiments, before the oil pressure of the first clutch is controlled to be in the target oil pressure range based on the torque of the first clutch, the method further comprises:

[0032] controlling the oil pressure of the first clutch to decrease to a first preset oil pressure range and controlling the oil pressure of the second clutch to increase to a second preset oil pressure range.

[0033] In some embodiments, the method further comprises:

[0034] obtaining the temperature of the first clutch;

[0035] in response to the temperature of the first clutch being greater than or equal to a temperature threshold, controlling the first clutch to stop shifting.

[0036] In a second aspect, the embodiments of the present application further provide a clutch oil pressure control device, the device comprising:

[0037] a determination module configured to determine the torque of a first clutch according to a shift instruction, wherein the first clutch is currently combined with a first input shaft and a second clutch is currently separated from the first input shaft;

[0038] a control module configured to control the oil pressure of the first clutch to be in a target oil pressure range based on the torque of the first clutch, so that the first clutch is separated from the first input shaft and the second clutch is combined with the first input shaft.

[0039] The technical solutions provided by the embodiments of the present application have at least the following beneficial effects:

[0040] The clutch oil pressure control method provided by the embodiments of the present application determines the torque of the first clutch currently combined with the first input shaft according to the shift instruction, and then controls the oil pressure of the first clutch to be in the target oil pressure range according to the torque of the first clutch, so as to control the pressing degree between the first clutch and the first input shaft by controlling the oil pressure of the first clutch, to achieve the purpose of controlling the speed of the first input shaft, so as to ensure that the speed of the first input shaft can reach the speed required for normal shift, so that the first clutch can be separated from the first input shaft and the second clutch can be combined with the first input shaft, and then the shift is completed. The method adjusts the oil pressure of the first clutch according to the torque of the first clutch, to ensure that the speed of the input shaft reaches the target speed, so as to avoid the increase of shift time, improve the smoothness of vehicle shift, and reduce the driving safety hidden danger. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced. Obviously, the drawings in the following description only represent some of the embodiments of the present application, and other drawings can be obtained by those of ordinary skill in the art without any creative effort based on these drawings.

[0042] Figure 1 A structural schematic diagram of a clutch oil pressure control system provided by an embodiment of the present application is shown in the figure.

[0043] Figure 2 A flowchart of a clutch oil pressure control method provided by an embodiment of the present application is shown in the figure.

[0044] Figure 3 A flowchart of another clutch oil pressure control method provided by an embodiment of the present application is shown in the figure.

[0045] Figure 4 A flowchart of a clutch oil pressure control method provided by an embodiment of the present application is shown in the figure, in which the oil pressure of a first clutch is controlled to be in a target oil pressure range based on the torque of the first clutch, so that the first clutch is separated from a first input shaft and a second clutch is combined with the first input shaft.

[0046] Figure 5 A structural schematic diagram of a clutch oil pressure control device provided by an embodiment of the present application is shown in the figure.

[0047] The above drawings have shown the specific embodiments of the present application, which will be described in more detail hereinafter. These drawings and the written description are not intended to limit the scope of the present application concept in any way, but to illustrate the present application concept to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be described clearly and completely by referring to the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without any creative effort belong to the scope of protection of the present application.

[0049] Unless otherwise defined, all the technical terms used in the embodiments of the present application have the same meanings as commonly understood by those of ordinary skill in the art.

[0050] In order to make the technical solutions and advantages of the present application more clear, the embodiments of the present application will be described in further detail by referring to the drawings.

[0051] In a hybrid vehicle, both the motor and the engine are involved in driving. When the vehicle is running, the power of the engine is transmitted to the gears in the gearbox through the clutch, and different speed ratios are achieved through different gear combinations. When shifting, the motor provides power to the input shaft, and the oil pressure at the connection between the clutch and the input shaft determines the speed of the input shaft. When the speed of the input shaft reaches the appropriate interval, the clutch realizes the gear shifting through its separation or combination.

[0052] In the related art, a preset oil pressure value is usually directly used as the oil pressure of the second clutch and the first clutch, and the speed of the input shaft connected to the clutch is controlled by controlling the oil pressure.

[0053] However, during the shifting process, the first clutch in the gearbox may have an excessively high oil pressure, which causes the speed of the input shaft connected to the clutch to fail to reach the target speed, so that the gearbox triggers a fault-tolerant shifting function. At this time, the first clutch is forced to reduce the oil pressure, enter the fault-tolerant shifting, and then enter the target gear, which greatly increases the shifting time and affects the smoothness of the vehicle shifting, thereby causing a driving safety hazard.

[0054] To solve the technical problems in the related art, the embodiments of the present application provide a clutch oil pressure control method, which can improve the smoothness of vehicle shifting and reduce driving safety hazards.

[0055] Before the embodiments of the present application are explained in detail, the architecture of a clutch oil pressure control system related to the embodiments of the present application will be briefly introduced.

[0056] Figure 1 A structural diagram of a clutch oil pressure control system provided by the embodiments of the present application is shown in FIG. 1. Figure 1 The system 100 includes a gearbox 110 and a gearbox controller. The gearbox 110 includes a first motor 111, a first input shaft 112, a second motor 113, a second input shaft 114, a first clutch 115, a first gear 116, a second clutch 117, a second gear 118, and an output shaft 119. The first motor 111 is connected to the first input shaft 112. The first input shaft 112 is connected to the first clutch 115 or the second clutch 117 in different gears. The second motor 113 is connected to the second input shaft 114 through the first gear 116 to transmit power to the output shaft 119 in different gears. The first motor 111 transmits power to the output shaft 119 through the first clutch 115 or the second clutch 117. The second clutch 117 is connected to the second gear 118 through a sleeve shaft.

[0057] Since the shifting instruction includes an upshift instruction and a downshift instruction, the structure of the system 100 will be illustrated from the perspectives of the upshift instruction and the downshift instruction as follows:

[0058] When the first input shaft gear is downshifted from three gears to two gears, and the second input shaft gear is unchanged, the gearbox controller receives a corresponding downshift instruction, controls the gearbox to start the corresponding downshift process, in which case, Figure 1 The first clutch 115 is the first clutch, and the second clutch 117 is the second clutch.

[0059] When the first input shaft gear is upshifted from two gears to three gears, and the second input shaft gear is unchanged, the gearbox controller receives a corresponding upshift instruction, controls the gearbox to start the corresponding upshift process, in which case, Figure 1 The first clutch 115 is the second clutch, and the second clutch 117 is the first clutch.

[0060] In some embodiments, the gearbox further has a first clutch solenoid valve and a second clutch solenoid valve inside, respectively used to control the oil pressure of the first clutch 115 and the oil pressure of the second clutch 117, wherein the first clutch solenoid valve is connected with the first clutch 115, and the second clutch solenoid valve is connected with the second clutch 117.

[0061] In some embodiments, the gearbox further has a speed sensor, an oil pressure sensor, a temperature sensor, and a torque sensor inside, respectively used to obtain the speed of the first input shaft 112 and the second input shaft 114, the oil pressure of the first clutch 115 and the second clutch 117, the temperature of the first clutch 115 and the second clutch 117, the torque applied to the first clutch 115, and the torque applied to the second clutch 117.

[0062] After introducing the structure of the clutch oil pressure control system involved in the embodiments of the present application, in order to make the technical solutions and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0063] Figure 2 A flowchart of a clutch oil pressure control method provided by the embodiments of the present application. Referring to Figure 1 The method is applied to a gearbox controller and includes the following steps:

[0064] Step 201, according to the gear shift instruction, determine the torque of the first clutch, wherein the first clutch is currently combined with the first input shaft, and the second clutch is currently separated from the first input shaft.

[0065] Step 202, based on the torque of the first clutch, control the oil pressure of the first clutch to be in the target oil pressure range, so that the first clutch is separated from the first input shaft, and the second clutch is combined with the first input shaft.

[0066] The clutch oil pressure control method provided by the embodiments of the present application determines the torque of the first clutch currently combined with the first input shaft according to the shift instruction, and then controls the oil pressure of the first clutch to be in a target oil pressure range according to the torque of the first clutch, so as to control the pressing degree between the first clutch and the first input shaft by controlling the oil pressure of the first clutch, to achieve the purpose of controlling the rotation speed of the first input shaft, so as to ensure that the rotation speed of the first input shaft can reach the rotation speed required for normally completing the shift, so that the first clutch can be separated from the first input shaft, and the second clutch can be combined with the first input shaft, to complete the shift.

[0067] Therefore, the method adjusts the oil pressure of the first clutch according to the torque of the first clutch, and then adjusts the rotation speed of the input shaft by the oil pressure of the first clutch, to ensure that the rotation speed of the input shaft reaches the target rotation speed, so as to avoid the increase of the shift time, improve the smoothness of the vehicle shift, and reduce the driving safety hidden danger.

[0068] In some embodiments, based on the torque of the first clutch, the control of the oil pressure of the first clutch to be in the target oil pressure range, so that the first clutch is separated from the first input shaft and the second clutch is combined with the first input shaft, comprises:

[0069] determining the target oil pressure range based on the torque of the first clutch;

[0070] controlling the change of the oil pressure of the first clutch based on the target oil pressure range, so that the first clutch is separated from the first input shaft and the second clutch is combined with the first input shaft.

[0071] In some embodiments, the target oil pressure range can be obtained according to the following calculation formula:

[0072] target oil pressure range=(torque of the first clutch x 1000 ÷ effective radius of the clutch ÷ effective number of pieces of the clutch ÷ friction coefficient) x 10 ÷ effective area of the clutch;

[0073] wherein the torque of the first clutch is a variable.

[0074] In some embodiments, the control of the change of the oil pressure of the first clutch based on the target oil pressure range comprises:

[0075] obtaining the oil pressure self-adjusting time, the initial oil pressure, the rotation speed of the first input shaft and the target rotation speed;

[0076] obtaining the compensation oil pressure based on the oil pressure self-adjusting time, the rotation speed of the first input shaft and the target rotation speed;

[0077] controlling the change of the oil pressure of the first clutch by the compensation oil pressure based on the initial oil pressure and the target rotation speed.

[0078] In some embodiments, obtaining the compensation oil pressure based on the oil pressure self-adjusting time, the first input shaft rotating speed and the target rotating speed comprises:

[0079] determining a rotating speed difference based on the first input shaft rotating speed and the target rotating speed;

[0080] determining a compensation torque based on the rotating speed difference and the oil pressure self-adjusting time;

[0081] determining the compensation oil pressure based on the compensation torque.

[0082] In some embodiments, the compensation torque can be obtained according to the following calculation formula:

[0083] compensation torque = rotating speed difference ÷ oil pressure self-adjusting time × moment of inertia.

[0084] In some embodiments, obtaining the target rotating speed comprises:

[0085] determining a target gear position according to the gear shift instruction;

[0086] determining a target speed ratio based on the target gear position;

[0087] determining the target rotating speed according to the output shaft rotating speed and the target speed ratio.

[0088] In some embodiments, based on the torque of the first clutch, the oil pressure of the first clutch is controlled to be in the target oil pressure range, the method further comprises:

[0089] controlling the oil pressure of the first clutch to decrease to a first preset oil pressure range and controlling the oil pressure of the second clutch to increase to a second preset oil pressure range.

[0090] In some embodiments, the method further comprises:

[0091] obtaining a temperature of the first clutch;

[0092] in response to the temperature of the first clutch being greater than or equal to a temperature threshold, controlling the first clutch to stop gear shifting.

[0093] Figure 3 Another flow chart of a clutch oil pressure control method provided by the embodiments of the present application is provided. Referring to FIG. 3, the method is applied to a gearbox controller and comprises the following steps: Figure 3

[0094] Step 301, determining a torque of the first clutch according to a gear shift instruction, wherein the first clutch is currently combined with the first input shaft and the second clutch is currently separated from the first input shaft.

[0095] ​Since the shift instruction contains the upshift instruction and the downshift instruction, it is necessary to determine which of the two clutches in the gearbox is the first clutch currently combined with the first input shaft and which is the second clutch currently separated from the first input shaft according to the shift instruction and the actual situation of the vehicle, and then obtain the torque of the first clutch through the torque sensor after the first clutch is determined, so as to complete the subsequent steps of the method.

[0096] In step 302, the oil pressure of the first clutch is reduced to the first preset oil pressure range, and the oil pressure of the second clutch is increased to the second preset oil pressure range.

[0097] When the shift instruction is just received, the gearbox controller determines the first preset oil pressure range and the second preset oil pressure range according to the specific shift instruction, so as to control the change of the oil pressure of the first clutch and the oil pressure of the second clutch to start the shift process.

[0098] In step 303, based on the torque of the first clutch, the oil pressure of the first clutch is controlled to be in the target oil pressure interval, so that the first clutch is separated from the first input shaft and the second clutch is combined with the first input shaft.

[0099] When the oil pressure of the first clutch needs to be controlled according to the torque of the first clutch, the oil pressure of the first clutch is controlled to be in the target oil pressure interval, so that the first clutch is separated from the first input shaft and the second clutch is combined with the first input shaft to complete the entire shift process.

[0100] In some embodiments, referring to Figure 4 , step 303 includes the following sub-steps:

[0101] In step 3031, based on the torque of the first clutch, the target oil pressure interval is determined.

[0102] By obtaining the torque of the first clutch in real time during the shift process, the range of the target oil pressure interval is adjusted, so as to avoid the phenomenon of too small or too large pressure of the first clutch and the second clutch.

[0103] In step 3032, based on the target oil pressure interval, the oil pressure of the first clutch is controlled to be changed, so that the first clutch is separated from the first input shaft and the second clutch is combined with the first input shaft.

[0104] By controlling the oil pressure of the first clutch and the second clutch, the phenomenon of various damage to the clutch and the extension of the shift time is avoided.

[0105] Thus, on one hand, during the speed regulation process, if the oil pressure of the first clutch is too small and the oil pressure of the second clutch is too large, the speed of the first input shaft will be too high during the downshift process. Since the gearbox controller will output a preset shift time according to the shift instruction, the speed regulation will not be completed when the preset shift time is reached, and the first clutch will continue to be in the slip state until the speed of the first input shaft is reduced to the target speed, which will prolong the shift time, affect the shift smoothness, and easily cause overheating of the clutch, resulting in failure of the clutch. During the upshift process, this will cause the speed of the first input shaft to be too low, and the vehicle will trigger the fault-tolerant shift function. After the oil pressure of the first clutch is released, the vehicle will enter the target gear to complete the shift, which will also prolong the shift time and affect the shift smoothness of the vehicle.

[0106] On the other hand, during the speed regulation process, if the oil pressure of the first clutch is too large and the oil pressure of the second clutch is too small, the speed of the first input shaft will not be high enough during the downshift process, and the shift cannot be performed. This will cause the vehicle to trigger the fault-tolerant shift function, release the oil pressure of the first clutch, and then enter the target gear to complete the shift, which will also prolong the shift time and affect the shift smoothness of the vehicle. During the upshift process, this will cause the first clutch to fail to reduce the speed of the first input shaft to the target speed. After the preset shift time is reached, the first clutch will continue to be in the slip state until the speed of the first input shaft is reduced to the target speed, which will prolong the shift time, affect the shift smoothness, and easily cause overheating of the clutch, resulting in failure of the clutch.

[0107] Therefore, by controlling the oil pressure of the first clutch and the second clutch based on the target oil pressure range through step 3032, failure of the clutch can be prevented, and the shift time can be shortened.

[0108] In some embodiments, the target oil pressure range can be obtained according to the following calculation formula:

[0109] Target oil pressure range = (torque of the first clutch x 1000 ÷ effective radius of the clutch ÷ effective number of pieces of the clutch ÷ friction coefficient) x 10 ÷ effective area of the clutch;

[0110] wherein the torque of the first clutch is a variable.

[0111] It can be understood that the effective radius of the clutch, the effective number of pieces of the clutch, the friction coefficient, and the effective area of the clutch are all known parameters, and therefore only the torque value needs to be obtained to calculate the target oil pressure range at this time. For example, the target oil pressure range is usually 1.5-8 bar.

[0112] In some embodiments, step 3032 further includes the following sub-steps:

[0113] Step one, obtaining the oil pressure self-adjusting time, the initial oil pressure, the first input shaft speed and the target speed.

[0114] In some embodiments, step one further comprises the following sub-steps:

[0115] Sub-step one, determining the target gear according to the shift instruction.

[0116] That is, the gearbox controller needs to determine the target gear to be replaced according to the shift instruction.

[0117] Sub-step two, determining the target speed ratio based on the target gear.

[0118] Sub-step three, determining the target speed according to the output shaft speed and the target speed ratio.

[0119] In some embodiments, the target speed can be obtained according to the following calculation formula:

[0120] Target speed = output shaft speed × target speed ratio.

[0121] Step two, in response to the shift process reaching the shift process preset value and the first input shaft speed being greater than or less than the target speed, obtaining the compensation oil pressure based on the oil pressure self-adjusting time, the first input shaft speed and the target speed, wherein the shift process = | (current speed - initial speed) ÷ (target speed - initial speed) |.

[0122] It can be understood that after receiving the shift instruction, the gearbox controller will determine a corresponding shift process preset value according to the shift instruction, and when the shift process reaches the shift process preset value, i.e. the shift process has entered the final stage, if the first input shaft speed at this time is still not equal to the target speed, then enter the oil pressure self-adjusting stage, and obtain the compensation oil pressure according to the first input shaft speed and the target speed, and control the first clutch to change the oil pressure by adjusting the compensation oil pressure, so that the first input shaft speed can reach the target speed.

[0123] In some embodiments, step two further comprises the following sub-steps:

[0124] Sub-step one, determining the speed difference based on the first input shaft speed and the target speed.

[0125] Sub-step two, determining the compensation torque based on the speed difference and the oil pressure self-adjusting time.

[0126] In some embodiments, the compensation torque can be obtained according to the following calculation formula:

[0127] Compensation torque = speed difference ÷ oil pressure self-adjusting time × moment of inertia.

[0128] Wherein, the speed difference is the difference between the first input shaft speed and the target speed, after obtaining the speed difference, the oil pressure self-adjusting time and the rotational inertia, the gearbox controller can obtain the compensation torque based on the formula.

[0129] Sub-step three, based on the compensation torque, determine the compensation oil pressure.

[0130] The formula for calculating the compensation oil pressure here, that is, the formula for calculating the target oil pressure range in the above, will replace the torque of the first clutch in the formula with the compensation torque, and the compensation oil pressure can be obtained. If the first input shaft speed is less than the target speed, the oil pressure of the first clutch needs to be adjusted according to the compensation oil pressure to reach the range of the target oil pressure range, so that the speed of the first input shaft rises to the target speed; if the first input shaft speed is greater than the target speed, the oil pressure of the first clutch needs to be adjusted according to the compensation oil pressure to reach the range of the target oil pressure range, so that the speed of the first input shaft falls to the target speed.

[0131] Step three, control the oil pressure of the first clutch according to the compensation oil pressure.

[0132] In some embodiments, in order to prevent the related equipment from malfunctioning or being damaged, the method further comprises the following steps:

[0133] Step one, obtain the temperature of the first clutch;

[0134] Step two, in response to the first clutch temperature being greater than or equal to the temperature threshold, control the first clutch to stop shifting.

[0135] For example, when the temperature of the first clutch rises to 260 degrees, the first clutch needs to be controlled to stop shifting to protect the clutch and related parts of the gearbox.

[0136] Figure 5 A structural schematic diagram of a clutch oil pressure control device provided by an embodiment of the present application is provided. Referring to Figure 5 The device 500 comprises:

[0137] The determination module 501 is configured to determine the torque of the first clutch according to the shifting instruction, wherein the first clutch is currently combined with the first input shaft, and the second clutch is currently separated from the first input shaft.

[0138] The control module 502 is configured to control the oil pressure of the first clutch to be in the target oil pressure range based on the torque of the first clutch, so that the first clutch is separated from the first input shaft and the second clutch is combined with the first input shaft.

[0139] In some embodiments, the control module comprises:

[0140] The first determining sub-module is configured to determine a target oil pressure interval based on the torque of the first clutch.

[0141] The first control sub-module is configured to control the oil pressure of the first clutch based on the target oil pressure interval, so that the first clutch is separated from the first input shaft and the second clutch is combined with the first input shaft.

[0142] In some embodiments, the target oil pressure interval can be obtained according to the following calculation formula:

[0143] Target oil pressure interval = (torque of the first clutch × 1000 ÷ effective radius of the clutch ÷ effective number of pieces of the clutch ÷ friction coefficient) × 10 ÷ effective area of the clutch.

[0144] Wherein, the torque of the first clutch is a variable.

[0145] In some embodiments, the first control sub-module includes:

[0146] The obtaining sub-module is configured to obtain an oil pressure self-adjusting time, an initial oil pressure, a first input shaft speed and a target speed.

[0147] The obtaining sub-module is configured to obtain an oil pressure self-adjusting time, an initial oil pressure, a first input shaft speed and a target speed.

[0148] The second control sub-module is configured to control the oil pressure of the first clutch by controlling the compensation oil pressure based on the initial oil pressure and the target speed.

[0149] In some embodiments, the obtaining sub-module includes:

[0150] The second determining sub-module is configured to determine a speed difference based on the first input shaft speed and the target speed.

[0151] The third determining sub-module is configured to determine a compensation torque based on the speed difference and the oil pressure self-adjusting time.

[0152] The fourth determining sub-module is configured to determine a compensation oil pressure based on the compensation torque.

[0153] In some embodiments, the compensation torque can be obtained according to the following calculation formula:

[0154] Compensation torque = speed difference ÷ oil pressure self-adjusting time × moment of inertia.

[0155] In some embodiments, the obtaining sub-module includes:

[0156] The fifth determining sub-module is configured to determine a target gear position according to a gear shifting instruction.

[0157] The sixth determining sub-module is configured to determine a target speed ratio based on the target gear position.

[0158] a seventh determining sub-module, configured to determine a target rotating speed according to the output shaft rotating speed and the target speed ratio.

[0159] In some embodiments, the apparatus further comprises:

[0160] an oil pressure control module, configured to control the oil pressure of the first clutch to decrease to a first preset oil pressure range and control the oil pressure of the second clutch to increase to a second preset oil pressure range.

[0161] In some embodiments, the apparatus further comprises:

[0162] an obtaining module, configured to obtain a first clutch temperature;

[0163] a shift control module, configured to control the first clutch to stop shifting in response to the first clutch temperature being greater than or equal to a temperature threshold.

[0164] Therefore, the clutch oil pressure control apparatus provided by the embodiments of the present application,

[0165] By determining the torque of the first clutch currently combined with the first input shaft according to the shift instruction, and then controlling the oil pressure of the first clutch to be in the target oil pressure range according to the torque of the first clutch, the degree of compression between the first clutch and the first input shaft is controlled by controlling the oil pressure of the first clutch, so as to achieve the purpose of controlling the rotating speed of the first input shaft, thereby ensuring that the rotating speed of the first input shaft can reach the rotating speed required for normal completion of shifting, so that the first clutch can be separated from the first input shaft, the second clutch can be combined with the first input shaft, and then the shifting is completed. The oil pressure of the first clutch is adjusted according to the torque of the first clutch, so as to ensure that the rotating speed of the input shaft reaches the target rotating speed, thereby avoiding the increase of the shifting time, improving the smoothness of vehicle shifting, and reducing the driving safety hidden danger.

[0166] The embodiments of the present application provide a non-volatile computer readable storage medium, which stores a computer program. The computer program is loaded by a processor and executes the clutch oil pressure control method provided by the above-mentioned embodiments, for example, the method shown in Figure 2 , Figure 3 or Figure 4 .

[0167] The embodiments of the present application also provide a computer program product containing instructions. When the computer program product runs on a computer, it can make the computer execute the clutch oil pressure control method provided by the above-mentioned method embodiments, for example, the method shown in Figure 2 , Figure 3 or Figure 4 .

[0168] Those skilled in the art can understand that all or part of the steps of the above-mentioned embodiments can be completed by hardware, or by program instructing relevant hardware to complete, and the program can be stored in a computer readable storage medium. The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0169] In this application, the terms "first" and "second" are used only for descriptive purposes, and are not to be construed as indicating or implying relative importance. The term "a plurality" refers to two or more, unless otherwise expressly specified.

[0170] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the present application cover any and all variations of the application that come within the scope of the general inventive concepts described herein and including the optional use of known or customary techniques of the art. The specification and examples are to be considered exemplary only.

[0171] It is to be understood that the application is not limited to the precise details of construction and the above-described and shown in the drawings, and that various modifications and changes can be effected therein by those skilled in the art without departing from the scope of the application. The scope of the application should be determined by the appended claims.

Claims

1. A control method of clutch oil pressure, characterized by, The method is applied to a gearbox controller, and comprises: determining a torque of a first clutch according to a shift instruction, wherein the first clutch is currently combined with a first input shaft, and a second clutch is currently separated from the first input shaft; controlling an oil pressure of the first clutch to be in a target oil pressure range based on the torque of the first clutch, so that the first clutch is separated from the first input shaft and the second clutch is combined with the first input shaft, comprising: determining the target oil pressure range based on the torque of the first clutch; and controlling the oil pressure of the first clutch to be changed based on the target oil pressure range, so that the first clutch is separated from the first input shaft and the second clutch is combined with the first input shaft; the target oil pressure range is obtained according to the following calculation formula: the target oil pressure range = (the torque of the first clutch × 1000 ÷ effective radius of the clutch ÷ effective number of pieces of the clutch ÷ friction coefficient) × 10 ÷ effective area of the clutch; wherein the torque of the first clutch is a variable.

2. The control method of clutch oil pressure according to claim 1, characterized by, the controlling the oil pressure of the first clutch based on the target oil pressure range comprises: obtaining an oil pressure self-adjusting time, an initial oil pressure, a first input shaft speed and a target speed; obtaining a compensation oil pressure based on the oil pressure self-adjusting time, the first input shaft speed and the target speed; changing the oil pressure of the first clutch by controlling the compensation oil pressure based on the initial oil pressure and the target speed.

3. The control method of clutch oil pressure according to claim 2, characterized by, the obtaining the compensation oil pressure based on the oil pressure self-adjusting time, the first input shaft speed and the target speed comprises: determining a speed difference based on the first input shaft speed and the target speed; determining a compensation torque based on the speed difference and the oil pressure self-adjusting time; determining the compensation oil pressure based on the compensation torque.

4. The control method of clutch oil pressure according to claim 3, characterized by the compensation torque is obtained according to the following calculation formula: the compensation torque = the speed difference ÷ the oil pressure self-adjusting time × moment of inertia.

5. The control method of clutch oil pressure according to claim 2, characterized by the obtaining the target speed comprises: determining a target gear position according to the shift instruction; determining a target speed ratio based on the target gear position; determining the target speed according to an output shaft speed and the target speed ratio.

6. The control method of oil pressure of a clutch according to claim 1, characterized by before the controlling the oil pressure of the first clutch to be in the target oil pressure range based on the torque of the first clutch, the method further comprises: controlling the oil pressure of the first clutch to decrease to a first preset oil pressure range, and controlling the oil pressure of the second clutch to increase to a second preset oil pressure range.

7. The control method of oil pressure of a clutch according to claim 1, characterized by the method further comprises: obtaining a temperature of the first clutch; in response to the temperature of the first clutch being greater than or equal to a temperature threshold, controlling the first clutch to stop shifting.

8. A clutch oil pressure control device, characterized in that, the device comprises: a determining module, configured to determine a torque of a first clutch according to a shift instruction, wherein the first clutch is currently combined with a first input shaft, and a second clutch is currently separated from the first input shaft; a control module, configured to control an oil pressure of the first clutch to be in a target oil pressure range based on the torque of the first clutch, so that the first clutch is separated from the first input shaft and the second clutch is combined with the first input shaft, comprising: determining the target oil pressure range based on the torque of the first clutch; and controlling the change of the oil pressure of the first clutch based on the target oil pressure range, so that the first clutch is separated from the first input shaft and the second clutch is combined with the first input shaft; The target oil pressure range is obtained according to the following calculation formula: The target oil pressure range = (the torque of the first clutch × 1000 ÷ the effective radius of the clutch ÷ the effective number of the clutch × the friction coefficient) × 10 ÷ the effective area of the clutch; Wherein, the torque of the first clutch is a variable.

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