Measurement method and device for semi-clutch point of clutch, and storage medium

Abstract

The present application discloses a measurement method and device for a semi-clutch point of a clutch, and a storage medium, which are applied to a gearbox controller. The method comprises: in response to a measurement instruction for a semi-clutch point of a clutch to be measured, controlling a rotating speed of a target motor to be a first rotating speed, such that a rotating speed difference exists between the target motor and an output shaft, wherein the target motor is connected to said clutch by means of the output shaft; starting from an initial current value, controlling a current supplied to said clutch to increase by a rated current difference value every preset duration, and measuring a torque increment of the target motor after the rated current difference value is increased; and in response to the torque increment of the target motor being greater than an increment threshold, measuring the pressure of said clutch, and determining a pressure value of said clutch as the semi-clutch point of said clutch. The method can improve the measurement precision of the semi-clutch point of the clutch.

Description

Clutch half-engagement point measurement method, device and storage medium

[0001] This application claims priority to Chinese patent application No. 202311576863.9, filed on November 20, 2023, entitled “Method and device for measuring the semi-clutch point of a clutch”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present application relates to the field of automobile motor control technology, and in particular to a method, device and storage medium for measuring a clutch half-engagement point. Background Art

[0003] A clutch typically consists of a friction plate pack, a piston that pushes and compresses the plates, and a return spring. Precise control of clutch pressure enables continuous shifting without power interruption. Precise clutch control relies on accurately determining the half-engagement point. This point is the pressure point where the clutch piston and friction plate pack, under the influence of oil pressure and the return spring, just make contact, resulting in zero theoretical torque transmission capacity.

[0004] Summary of the Invention

[0005] In view of this, the present application provides a method, device and storage medium for measuring the clutch half-engagement point. The technical solution is as follows:

[0006] In a first aspect, an embodiment of the present application provides a method for measuring a clutch half-engagement point, which is applied to a transmission controller. The method includes:

[0007] In response to a command for measuring a half-clutch point of the clutch to be tested, controlling the speed of the target motor to a first speed so that a speed difference exists between the target motor and an output shaft, wherein the target motor is connected to the clutch to be tested via the output shaft;

[0008] Starting from an initial current value, controlling the current flowing to the clutch to be tested to increase by a rated current difference at preset time intervals, and measuring the torque increment of the target motor after the rated current difference is increased;

[0009] In response to the torque increment of the target motor being greater than an increment threshold, the pressure of the clutch to be tested is measured, and the pressure value of the clutch to be tested is determined as a half-clutch point of the clutch to be tested.

[0010] In some embodiments, the target motor includes a first motor, the output shaft includes a first output shaft, and the first motor is connected to the clutch to be tested via the first output shaft; and in response to the instruction for detecting the half-clutch point of the clutch to be tested, controlling the speed of the target motor to a first speed so that a speed difference exists between the target motor and the output shaft comprises:

[0011] In response to the instruction for measuring the half-clutch point of the clutch to be measured, the rotational speed of the first motor is controlled to be the first rotational speed, so that there is a rotational speed difference between the first motor and the first output shaft.

[0012] In some embodiments, starting from an initial current value, controlling the current flowing to the clutch to be tested to increase by a rated current difference at predetermined intervals, and measuring the torque increment of the target motor after the rated current difference is increased, comprises:

[0013] Starting from the initial current value, the current flowing to the clutch to be tested is controlled to increase by the rated current difference at preset time intervals, and after the rated current difference is increased, the torque increment of the first motor is measured.

[0014] In some embodiments, in response to the torque increment of the target motor being greater than an increment threshold, measuring the pressure of the clutch to be tested, and determining the pressure value of the clutch to be tested as the half-clutch point of the clutch to be tested includes:

[0015] In response to the torque increment of the first motor being greater than the increment threshold, the pressure of the clutch to be tested is measured, and the pressure value of the clutch to be tested is determined as a half-clutch point of the clutch to be tested.

[0016] In some embodiments, the target motor includes a first motor and a second motor, the output shaft includes a first output shaft and a second output shaft, the first motor and the second motor are connected to the clutch to be tested via the first output shaft and the second output shaft, respectively; and in response to the instruction for detecting the half-clutch point of the clutch to be tested, controlling the speed of the target motor to a first speed so that a speed difference exists between the target motor and the output shaft comprises:

[0017] In response to the instruction for measuring the half-clutch point of the clutch to be measured, controlling the rotational speed of the first motor to be the first rotational speed, so that a rotational speed difference exists between the first motor and the first output shaft;

[0018] In response to the instruction for measuring the half-clutch point of the clutch to be measured, the rotational speed of the second motor is controlled to be the first rotational speed, so that there is a rotational speed difference between the second motor and the second output shaft.

[0019] In some embodiments, starting from an initial current value, controlling the current flowing to the clutch to be tested to increase by a rated current difference at predetermined intervals, and measuring the torque increment of the target motor after the rated current difference is increased, comprises:

[0020] Starting from the initial current value, the current flowing to the clutch to be tested is controlled to increase by the rated current difference at preset time intervals, and after the rated current difference is increased, the torque increment of the first motor and the torque increment of the second motor are measured.

[0021] In some embodiments, in response to the torque increment of the target motor being greater than an increment threshold, measuring the pressure of the clutch to be tested, and determining the pressure value of the clutch to be tested as the half-clutch point of the clutch to be tested includes:

[0022] In response to the torque increment of the first motor and / or the torque increment of the second motor being greater than the increment threshold, the pressure of the clutch to be tested is measured, and the pressure value of the clutch to be tested is determined as the half-clutch point of the clutch to be tested.

[0023] In some embodiments, in response to the torque increment of the target motor being greater than an increment threshold, after measuring the pressure of the clutch to be tested and determining the pressure value of the clutch to be tested as a half-clutch point of the clutch to be tested, the method further includes:

[0024] controlling the current flowing into the clutch to be tested to become zero;

[0025] Repeating the process of increasing the current flowing through the clutch to be tested by a rated current difference at predetermined intervals starting from an initial current value, and measuring the torque increment of the target motor after the rated current difference is increased until the current flowing through the clutch to be tested becomes zero, until the number of repetitions reaches a threshold number;

[0026] An average value of all the obtained half-clutch points of the clutch to be tested is taken to obtain a target half-clutch point of the clutch to be tested.

[0027] In some embodiments, before controlling the speed of the target motor to a first speed in response to the command for measuring the half-clutch point of the clutch to be measured so that a speed difference exists between the target motor and the output shaft, the method further includes:

[0028] In response to the measurement instruction of the half-clutch point of the clutch to be tested, the oil pump speed is controlled to maintain a second speed so that the main oil pressure of the transmission is maintained at a first oil pressure, and the current to the clutch to be tested is controlled to be zero, wherein the oil pump is used to maintain the main oil pressure of the transmission at the first oil pressure.

[0029] In a second aspect, an embodiment of the present application further provides a device for measuring a clutch half-engagement point, the device comprising:

[0030] a first control module, configured to control the rotational speed of a target motor to a first rotational speed in response to a detection instruction of a half-clutch point of a clutch to be tested, so that a rotational speed difference exists between the target motor and an output shaft, wherein the target motor is connected to the clutch to be tested via the output shaft;

[0031] a second control module, configured to control the current flowing to the clutch to be tested to increase by a rated current difference at preset time intervals starting from an initial current value, and to measure a torque increment of the target motor after the rated current difference is increased;

[0032] The measuring module is configured to measure the pressure of the clutch to be measured in response to the torque increment of the target motor being greater than an increment threshold, and determine the pressure value of the clutch to be measured as a half-clutch point of the clutch to be measured.

[0033] In some embodiments, the target motor includes a first motor, the output shaft includes a first output shaft, the first motor is connected to the clutch to be tested via the first output shaft; and the first control module includes:

[0034] The first control submodule is configured to control the rotational speed of the first motor to be the first rotational speed in response to the detection instruction of the half-clutch point of the clutch to be tested, so that there is a rotational speed difference between the first motor and the first output shaft.

[0035] In some embodiments, the second control module includes:

[0036] The second control submodule is configured to control the current flowing to the clutch to be tested to increase by the rated current difference at preset time intervals starting from the initial current value, and to measure the torque increment of the first motor after the rated current difference is increased.

[0037] In some embodiments, the detection module includes:

[0038] The first measuring submodule is configured to measure the pressure of the clutch to be measured in response to the torque increment of the first motor being greater than the increment threshold, and determine the pressure value of the clutch to be measured as a half-clutch point of the clutch to be measured.

[0039] In some embodiments, the target motor includes a first motor and a second motor, the output shaft includes a first output shaft and a second output shaft, the first motor and the second motor are connected to the clutch to be tested via the first output shaft and the second output shaft, respectively; and the first control module further includes:

[0040] a third control submodule, configured to control the rotational speed of the first motor to the first rotational speed in response to the instruction for measuring the half-clutch point of the clutch to be measured, so that a rotational speed difference exists between the first motor and the first output shaft;

[0041] The fourth control submodule is configured to control the speed of the second motor to be the first speed in response to the detection instruction of the half-clutch point of the clutch to be tested, so that there is a speed difference between the second motor and the second output shaft.

[0042] In some embodiments, the second control module further includes:

[0043] The fifth control submodule is used to control the current to the clutch to be tested to increase the rated current difference at preset time intervals starting from the initial current value, and to measure the torque increment of the first motor and the torque increment of the second motor after the rated current difference is increased.

[0044] In some embodiments, the detection module further includes:

[0045] The second measuring submodule is configured to measure the pressure of the clutch to be tested in response to the torque increment of the first motor and / or the torque increment of the second motor being greater than the increment threshold, and determine the pressure value of the clutch to be tested as the half-clutch point of the clutch to be tested.

[0046] In some embodiments, the apparatus further comprises:

[0047] a third control module, configured to control the current flowing to the clutch to be tested to become zero;

[0048] a repetitive execution module, configured to repeatedly execute the process of controlling the current flowing to the clutch to be tested to increase by a rated current difference at predetermined intervals starting from an initial current value, and measuring the torque increment of the target motor after the rated current difference is increased until the current flowing to the clutch to be tested becomes zero, until the number of repetitive executions reaches a threshold number;

[0049] The obtaining module is used to take an average value of all the obtained half-clutch points of the clutch to be tested to obtain a target half-clutch point of the clutch to be tested.

[0050] In some embodiments, the apparatus further comprises:

[0051] a fourth control module, configured to control the oil pump speed to maintain a second speed in response to the measurement instruction of the half-clutch point of the clutch to be tested, so as to maintain the main oil pressure of the transmission at a first oil pressure, and to control the current to the clutch to be tested to zero, wherein the oil pump is configured to maintain the main oil pressure of the transmission at the first oil pressure.

[0052] In a third aspect, an embodiment of the present application further provides a non-volatile computer-readable storage medium, which stores computer instructions, and the computer instructions are loaded and executed by a processor to implement the operations performed in the clutch half-clutch point detection method as described in the first aspect above. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0054] FIG1 is a schematic diagram of the architecture of a clutch half-engagement point detection system provided in an embodiment of the present application;

[0055] FIG2 is a flow chart of a method for measuring a clutch half-engagement point provided in an embodiment of the present application;

[0056] FIG3 is a flow chart of another method for measuring a clutch half-engagement point provided in an embodiment of the present application;

[0057] FIG4 is a flow chart of another method for measuring a clutch half-engagement point provided in an embodiment of the present application;

[0058] FIG5 is a schematic structural diagram of a device for measuring a clutch half-engagement point provided in an embodiment of the present application.

[0059] The reference numerals in the figure are respectively represented as: 110 - engine, 120 - gearbox, 121 - first clutch, 122 - first motor, 123 - second clutch, 124 - third clutch, 125 - G2 gear driving gear, 126 - second motor, 127 - G1 gear driving gear, 128 - G3 gear driving gear, 129 - synchronizer, 130 - gearbox controller.

[0060] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0062] Unless otherwise defined, all technical terms used in the embodiments of the present application have the same meanings as commonly understood by those skilled in the art.

[0063] In order to make the technical solutions and advantages of the present application clearer, the implementation methods of the present application will be described in further detail below with reference to the accompanying drawings.

[0064] As a key component in automotive power transmission, the clutch plays a vital role in power transmission and connection during the gear shifting process. A clutch generally consists of a friction plate pack, a piston that pushes and compresses the plates, and a return spring. Precise control of clutch pressure enables continuous gear shifting without power interruption. Precise clutch control relies on accurately determining the half-clutch point. Throughout the shifting process, accurate determination of the clutch's half-clutch point determines smooth torque transmission during the initial shift. Therefore, the more accurately the half-clutch point is measured, the smoother the shifting process for the vehicle's related components and the lower the friction losses. The half-clutch point is the pressure point where the clutch piston and friction plate pack, acting under the action of oil pressure and the return spring, theoretically reach zero torque transmission capacity.

[0065] In related technologies, relevant personnel usually step on the brake and start the engine when the transmission is in the first gear position. After the engine is at a stable idle speed for five seconds, the clutch pressure is increased at a fixed step size until the engine speed drops to a certain threshold. The pressure of the clutch at the previous step size is determined, and this pressure value is used as the half-clutch point, thereby realizing the measurement of the clutch half-clutch point.

[0066] However, since the related technology requires relevant personnel to perform measurement through manual operation, there is a problem of low precision in each operation step, which makes the accuracy of the half-clutch point measured by the related technology low.

[0067] In order to solve the technical problems existing in the related art, an embodiment of the present application provides a method for measuring the half-clutch point of the clutch, which can improve the measurement accuracy of the half-clutch point of the clutch.

[0068] Before explaining the embodiments of the present application in detail, the architecture of the clutch half-engagement point detection system involved in the embodiments of the present application is briefly introduced.

[0069] Figure 1 is a schematic diagram of the architecture of a clutch half-clutch point measurement system provided in an embodiment of the present application. As shown in Figure 1, the clutch half-clutch point measurement system 100 includes an engine 110, a gearbox 120 and a gearbox controller 130, wherein the gearbox 120 is connected to the engine 110 and the gearbox controller 130, respectively.

[0070] The gearbox 120 includes a first clutch 121, a first motor 122, a second clutch 123, a third clutch 124, a G2 gear driving gear 125, a second motor 126, a G1 gear driving gear 127, a G3 gear driving gear 128, and a synchronizer 129. The first clutch 121 is connected to the engine 110 and the first motor 122, the second clutch 123 and the third clutch 124 are both connected to the first motor 122 and the second motor 126, the G2 gear driving gear 125, the G1 gear driving gear 127, and the G3 gear driving gear 128 are connected in sequence, the G2 gear driving gear 125 is also connected to the third clutch 124, and the G3 gear driving gear 128 is also connected to the synchronizer 129.

[0071] In some embodiments, the transmission controller 130 may be a transmission controller of a DHT three-speed transmission.

[0072] In the embodiment of the present application, before measuring the half-clutch point of the first clutch 121 and the second clutch 123, the gearbox 120 needs to be shifted to neutral gear, and before measuring the half-clutch point of the third clutch 124, the gearbox 120 needs to be shifted to first gear to ensure that the speed of the output shaft connected to the third clutch 124 can be synchronized, thereby ensuring that the measurement of the half-clutch point can be carried out smoothly.

[0073] After introducing the architecture of the clutch half-clutch point measurement system involved in the embodiment of the present application, in order to make the technical solution and advantages of the present application clearer, the implementation method of the present application will be further described in detail with reference to the accompanying drawings.

[0074] FIG2 is a flow chart of a method for measuring a clutch half-engagement point according to an embodiment of the present application. Referring to FIG2 , the method is applied to a transmission controller and includes the following steps:

[0075] Step 201 , in response to a detection instruction for a half-clutch point of a clutch to be tested, controlling the speed of a target motor to a first speed so that there is a speed difference between the target motor and an output shaft, wherein the target motor is connected to the clutch to be tested via the output shaft.

[0076] In some embodiments, the first rotational speed may be 1000 rpm.

[0077] By controlling the speed of the target motor to be the first speed, a speed difference is created between the target motor and the output shaft, thereby ensuring that the target motor can accurately reflect whether the clutch has reached the half-clutch point by observing whether its own torque suddenly changes while its own speed remains unchanged.

[0078] Step 202 : Starting from the initial current value, control the current flowing to the clutch to be tested to increase by the rated current difference at preset time intervals, and after the rated current difference is increased, measure the torque increment of the target motor.

[0079] The current value to the clutch to be tested is increased slightly at preset time intervals, and then the torque increment of the target motor is measured to ensure that when the torque of the target motor suddenly changes, this torque mutation phenomenon can be accurately measured.

[0080] In some embodiments, the initial current value may be 200 mA, the preset time duration may be 1 to 2 seconds, and the rated current difference may be 10 mA.

[0081] Step 203 : In response to the torque increment of the target motor being greater than the increment threshold, measuring the pressure of the clutch to be tested, and determining the pressure value of the clutch to be tested as the half-clutch point of the clutch to be tested.

[0082] When the torque increment of the target motor suddenly exceeds the increment threshold, it indicates that a sudden torque change has occurred in the target motor. The pressure of the clutch to be tested is measured at this time, and this pressure value is used as the half-clutch point of the clutch to be tested, thereby achieving accurate measurement of the clutch half-clutch point.

[0083] In some embodiments, the incremental threshold may be 10 Nm.

[0084] Therefore, in the clutch half-engagement point measurement method provided by the embodiments of the present application, a transmission controller, in response to a command to measure the half-engagement point of the clutch under test, controls the speed of a target motor to maintain a first speed, thereby creating a speed difference between the target motor and the output shaft. Since the target motor is connected to the clutch under test via the output shaft, this allows the target motor, while its own speed remains unchanged, to accurately reflect whether the clutch has reached the half-engagement point by determining whether a sudden change in its own torque occurs. Therefore, starting from an initial current value, the transmission controller increases the current flowing to the clutch under test by a rated current difference at predetermined intervals. After the rated current difference is increased, the torque increment of the target motor is measured. When the torque increment of the motor exceeds an increment threshold, the pressure of the clutch under test is measured, and this pressure value is determined as the half-engagement point of the clutch under test. This method measures the clutch half-engagement point by detecting sudden changes in the motor's torque at a fixed speed, replacing the related art method of manually measuring the clutch half-engagement point, thereby improving the accuracy of clutch half-engagement point measurement.

[0085] Since there are multiple clutches in a gearbox, the method for measuring the clutch half-engagement point provided by the embodiment of the present application will be described below in two cases, as follows:

[0086] In the first case, the first motor is used to measure the half-clutch point of the first clutch, wherein the target motor includes the first motor, the output shaft includes the first output shaft, the first motor is connected to the clutch to be measured through the first output shaft, wherein the first motor can be an ISG motor.

[0087] In this case, FIG3 is a flow chart of another method for measuring the half-engaged clutch point provided in an embodiment of the present application. Referring to FIG3 , the method is applied to a transmission controller. The method includes sub-step 2011 of step 201, sub-step 2021 of step 202, and sub-step 2031 of step 203. The steps of the method are as follows:

[0088] Step 2011: In response to a detection instruction for a half-clutch point of the clutch to be tested, the speed of the first motor is controlled to be a first speed, so that there is a speed difference between the first motor and the first output shaft.

[0089] When only the first motor is connected to the clutch to be tested, as long as there is a speed difference between the first motor and the first output shaft, and the first motor can accurately reflect whether the clutch has reached the half-clutch point by whether its own torque has a sudden change while its own speed remains unchanged, the next measurement step can be carried out.

[0090] In some embodiments, the first rotational speed may be 1000 rpm.

[0091] Step 2021 , starting from the initial current value, controlling the current flowing to the clutch to be tested to increase by the rated current difference at preset time intervals, and measuring the torque increment of the first motor after the rated current difference is increased.

[0092] The current value to the clutch to be tested is increased slightly at preset time intervals, and then the torque increment of the first motor is measured to ensure that when the torque of the first motor suddenly changes, this torque mutation phenomenon can be accurately measured.

[0093] In some embodiments, the initial current value may be 200 mA, the preset time duration may be 1 to 2 seconds, and the rated current difference may be 10 mA.

[0094] Step 2031 : In response to the torque increment of the first motor being greater than the increment threshold, the pressure of the clutch to be tested is measured, and the pressure value of the clutch to be tested is determined as the half-clutch point of the clutch to be tested.

[0095] When the torque increment of the first motor suddenly exceeds the increment threshold, it indicates that a sudden torque change occurs in the first motor at this time. The pressure of the clutch to be tested at this time is measured, and this pressure value is used as the half-clutch point of the clutch to be tested, thereby achieving accurate measurement of the clutch half-clutch point.

[0096] In some embodiments, the incremental threshold may be 10 Nm.

[0097] In the second case, the first motor and the second motor are used to measure the half-clutch points of the second clutch and the third clutch, wherein the target motor includes the first motor and the second motor, the output shaft includes the first output shaft and the second output shaft, and the first motor and the second motor are connected to the clutch to be measured through the first output shaft and the second output shaft, wherein the first motor can be an ISG motor and the second motor can be a TM motor.

[0098] In this case, FIG4 is a flow chart of another method for measuring the clutch half-engagement point provided in an embodiment of the present application. Referring to FIG4 , the method is applied to a transmission controller. The method includes sub-steps 2012 and 2013 of step 201, sub-step 2022 of step 202, and sub-step 2032 of step 203. The steps of the method are as follows:

[0099] Step 2012: In response to the instruction for measuring the half-clutch point of the clutch to be measured, the speed of the first motor is controlled to be a first speed, so that there is a speed difference between the first motor and the first output shaft.

[0100] Step 2013: In response to the instruction for measuring the half-clutch point of the clutch to be measured, the speed of the second motor is controlled to be a first speed, so that there is a speed difference between the second motor and the second output shaft.

[0101] When the first motor and the second motor are both connected to the clutch to be tested, there must be a speed difference between the first motor and the first output shaft, and there must also be a speed difference between the second motor and the second output shaft, so as to ensure that the first motor and the second motor can accurately reflect whether the clutch has reached the half-clutch point by whether their own torque has a sudden change while their own speeds remain unchanged, and then the next measurement step can be carried out.

[0102] In some embodiments, the first rotational speed may be 1000 rpm.

[0103] Step 2022: Starting from the initial current value, control the current to the clutch to be tested to increase by the rated current difference every preset time period, and after the rated current difference is increased, measure the torque increment of the first motor and the torque increment of the second motor.

[0104] The current value to the clutch to be tested is increased slightly at preset time intervals, and then the torque increments of the first motor and the second motor are measured to ensure that when the torque of the first motor and / or the second motor suddenly changes, this torque mutation phenomenon can be accurately measured.

[0105] In some embodiments, the initial current value may be 200 mA, the preset time duration may be 1 to 2 seconds, and the rated current difference may be 10 mA.

[0106] Step 2032 : In response to the torque increment of the first motor and / or the torque increment of the second motor being greater than the increment threshold, the pressure of the clutch to be tested is measured, and the pressure value of the clutch to be tested is determined as the half-clutch point of the clutch to be tested.

[0107] When the torque increment of the first motor and / or the second motor suddenly exceeds the increment threshold, it indicates that a sudden torque change occurs in the first motor and / or the second motor at this time. The pressure of the clutch to be tested at this time is measured, and this pressure value is used as the half-clutch point of the clutch to be tested, thereby achieving accurate measurement of the clutch half-clutch point.

[0108] In some embodiments, the incremental threshold may be 10 Nm.

[0109] Before executing step 201 in the clutch half-engagement point detection method provided in the embodiment of the present application, the following pre-steps need to be executed:

[0110] In response to the measurement instruction of the half-clutch point of the clutch to be tested, the oil pump speed is controlled to maintain the second speed so that the main oil pressure of the transmission is maintained at the first oil pressure, and the current to the clutch to be tested is controlled to zero, wherein the oil pump is used to maintain the main oil pressure of the transmission at the first oil pressure.

[0111] In some embodiments, the second rotation speed may be 2000 rpm, and the first oil pressure may be 5 bar.

[0112] In some embodiments, when the target motor includes a first motor and a second motor, the preparatory step includes:

[0113] In response to the measurement instruction of the half-clutch point of the clutch to be tested, the oil pump speed is controlled to maintain the third speed so that the main oil pressure of the transmission is maintained at the first oil pressure, and the current to the clutch to be tested is controlled to zero, wherein the oil pump is used to maintain the main oil pressure of the transmission at the first oil pressure.

[0114] In some embodiments, the third rotational speed may be 1500 rpm.

[0115] In the case that the target motor includes the first motor and the second motor, when the oil pump rotates, it also drives a mechanical oil pump to rotate to provide oil pressure. Therefore, the third speed is lower than the second speed.

[0116] In some embodiments, the oil pump may be an EOP electronic oil pump.

[0117] In some embodiments, before executing step 201 , the method further includes: simulating engine end locking using a test bench.

[0118] After executing step 203 in the clutch half-engagement point detection method provided in the embodiment of the present application, the following post-steps need to be executed:

[0119] Step 1: Control the current flowing to the clutch to be tested to zero.

[0120] The current to the clutch to be tested is controlled to return to zero to facilitate the next round of testing.

[0121] Step 2: Repeat all steps from step 202 to step 1 until the number of repetitions reaches a threshold.

[0122] In some embodiments, the number threshold may be 3.

[0123] Step three: taking an average of the half-clutch points of all the clutches to be tested to obtain a target half-clutch point of the clutch to be tested.

[0124] By repeatedly measuring the half-clutch point of the same clutch to be tested and taking the average value, the measurement error is further reduced, the measurement accuracy is improved, and the accuracy of the measurement of the clutch half-clutch point is ensured.

[0125] In some embodiments, while step 203 is being performed, the method further includes:

[0126] In response to the torque increment of the target motor being greater than the increment threshold, the current of the clutch to be measured is measured, and the measured pressure value and current value are stored in the EEPROM.

[0127] In some embodiments, the transmission oil temperature may be 60° C. (±5° C.), and the accuracy of the pressure sensor used to measure the clutch pressure may be ±0.2 bar.

[0128] In some embodiments, the method for measuring the clutch half-engagement point provided in the embodiments of the present application can be performed on a test bench.

[0129] The embodiment of the present application further provides a device for measuring the half-engagement point of a clutch, as shown in FIG5 , the device 500 includes:

[0130] a first control module 501 configured to, in response to an instruction for measuring a half-clutch point of the clutch to be tested, control the speed of the target motor to a first speed such that a speed difference exists between the target motor and an output shaft, wherein the target motor is connected to the clutch to be tested via the output shaft;

[0131] A second control module 502 is configured to control the current flowing to the clutch to be tested to increase by a rated current difference at predetermined intervals starting from an initial current value, and to measure a torque increment of the target motor after the rated current difference has been increased;

[0132] The measuring module 503 is configured to measure the pressure of the clutch to be measured in response to the torque increment of the target motor being greater than the increment threshold, and determine the pressure value of the clutch to be measured as the half-clutch point of the clutch to be measured.

[0133] In some embodiments, the first control module 501 includes:

[0134] The first control submodule is configured to control the rotational speed of the first motor to be a first rotational speed in response to a detection instruction of a half-clutch point of the clutch to be tested, so that a rotational speed difference exists between the first motor and the first output shaft.

[0135] In some embodiments, the second control module 502 includes:

[0136] The second control submodule is used to control the current to the clutch to be tested to increase the rated current difference at preset time intervals starting from the initial current value, and to measure the torque increment of the first motor after the rated current difference is increased.

[0137] In some embodiments, the detection module 503 includes:

[0138] The first measuring submodule is configured to measure the pressure of the clutch to be measured in response to the torque increment of the first motor being greater than the increment threshold, and determine the pressure value of the clutch to be measured as a half-clutch point of the clutch to be measured.

[0139] In some embodiments, the first control module 501 further includes:

[0140] The third control submodule is configured to control the rotational speed of the first motor to be a first rotational speed in response to a detection instruction of a half-clutch point of the clutch to be tested, so that a rotational speed difference exists between the first motor and the first output shaft.

[0141] The fourth control submodule is configured to control the speed of the second motor to be a first speed in response to a detection instruction of a half-clutch point of the clutch to be tested, so that a speed difference exists between the second motor and the second output shaft.

[0142] In some embodiments, the second control module 502 further includes:

[0143] The fifth control submodule is used to control the current to the clutch to be tested to increase the rated current difference every preset time period starting from the initial current value, and after the rated current difference is increased, measure the torque increment of the first motor and the torque increment of the second motor.

[0144] In some embodiments, the detection module 503 further includes:

[0145] The second measuring submodule is configured to measure the pressure of the clutch to be tested in response to the torque increment of the first motor and / or the torque increment of the second motor being greater than the increment threshold, and determine the pressure value of the clutch to be tested as the half-clutch point of the clutch to be tested.

[0146] In some embodiments, the apparatus 500 further includes:

[0147] The third control module is configured to control the current flowing to the clutch to be tested to become zero.

[0148] The repeated execution module is used to repeatedly execute the process of controlling the current to the clutch to be tested to increase the rated current difference at preset time intervals starting from the initial current value, and after the rated current difference is increased, measuring the torque increment of the target motor to control the current to the clutch to be tested to become zero, until the number of repeated executions reaches a threshold number.

[0149] The obtaining module is used to take an average value of the obtained half-clutch points of all the clutches to be tested to obtain a target half-clutch point of the clutch to be tested.

[0150] In some embodiments, the apparatus 500 further includes:

[0151] The fourth control module is used to control the oil pump speed to maintain the second speed in response to the measurement instruction of the half-clutch point of the clutch to be tested, so that the main oil pressure of the transmission is maintained at the first oil pressure, and control the current to the clutch to be tested to zero, wherein the oil pump is used to maintain the main oil pressure of the transmission at the first oil pressure.

[0152] Therefore, the clutch half-clutch point measurement device provided in the embodiment of the present application realizes the measurement of the clutch half-clutch point by detecting the torque mutation of the motor at a fixed speed, replacing the method of measuring the clutch half-clutch point through manual operation of relevant personnel in the related technology, thereby improving the measurement accuracy of the clutch half-clutch point.

[0153] An embodiment of the present application further provides a vehicle, comprising the clutch half-engagement point detection device provided in the previous embodiment.

[0154] Based on the same inventive concept, corresponding to any of the above-mentioned embodiment methods, the present disclosure also provides a non-volatile computer-readable storage medium, which stores computer instructions, and the computer instructions are loaded and executed by a processor to implement the operations performed in the clutch half-clutch point detection method in the above-mentioned method embodiment.

[0155] Based on the same inventive concept, corresponding to any of the above-mentioned embodiment methods, the present disclosure also provides a computer program product, including a computer program or computer instructions, which, when executed by a processor, implements the operations performed in the clutch semi-clutch point detection method in the above-mentioned method embodiment.

[0156] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless expressly limited otherwise.

[0157] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the present invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only.

[0158] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A method for measuring a clutch semi-engagement point, characterized in that: Applied to a transmission controller, the method comprises: In response to a detection instruction of a half-clutch point of the clutch to be tested, controlling the speed of the target motor to be a first speed so that there is a speed difference between the target motor and an output shaft, wherein the target motor is connected to the clutch to be tested via the output shaft; Starting from an initial current value, controlling the current flowing to the clutch to be tested to increase by a rated current difference at preset time intervals, and measuring the torque increment of the target motor after the rated current difference is increased; In response to the torque increment of the target motor being greater than an increment threshold, the pressure of the clutch to be tested is measured, and the pressure value of the clutch to be tested is determined as a half-clutch point of the clutch to be tested.

2. The method for measuring the clutch semi-engagement point according to claim 1, characterized in that: The target motor includes a first motor, the output shaft includes a first output shaft, the first motor is connected to the clutch to be tested through the first output shaft; and in response to the detection instruction of the half-clutch point of the clutch to be tested, the speed of the target motor is controlled to be a first speed, so that there is a speed difference between the target motor and the output shaft, including: In response to the detection instruction of the half-clutch point of the clutch to be tested, the rotation speed of the first motor is controlled to be the first rotation speed, so that there is a rotation speed difference between the first motor and the first output shaft.

3. The method for measuring the clutch semi-engagement point according to claim 2, characterized in that: Starting from the initial current value, controlling the current flowing to the clutch to be tested to increase the rated current difference at preset time intervals, and after the rated current difference is increased, measuring the torque increment of the target motor includes: Starting from the initial current value, the current flowing to the clutch to be tested is controlled to increase by the rated current difference at preset time intervals, and after the rated current difference is increased, the torque increment of the first motor is measured.

4. The method for measuring the clutch semi-engagement point according to claim 3, characterized in that: In response to the torque increment of the target motor being greater than the increment threshold, measuring the pressure of the clutch to be tested, and determining the pressure value of the clutch to be tested as the half-clutch point of the clutch to be tested includes: In response to the torque increment of the first motor being greater than the increment threshold, the pressure of the clutch to be tested is measured, and the pressure value of the clutch to be tested is determined as a half-clutch point of the clutch to be tested.

5. The method for measuring the clutch semi-engagement point according to claim 1, characterized in that: The target motor includes a first motor and a second motor, the output shaft includes a first output shaft and a second output shaft, the first motor and the second motor are connected to the clutch to be tested through the first output shaft and the second output shaft respectively; and in response to the detection instruction of the half-clutch point of the clutch to be tested, the speed of the target motor is controlled to be a first speed, so that there is a speed difference between the target motor and the output shaft, including: In response to the detection instruction of the half-clutch point of the clutch to be detected, controlling the rotation speed of the first motor to be the first rotation speed, so that there is a rotation speed difference between the first motor and the first output shaft; In response to the detection instruction of the half-clutch point of the clutch to be tested, the rotation speed of the second motor is controlled to be the first rotation speed, so that there is a rotation speed difference between the second motor and the second output shaft.

6. The method for measuring the clutch half-engagement point according to claim 5, characterized in that: Starting from the initial current value, controlling the current flowing to the clutch to be tested to increase the rated current difference at preset time intervals, and after the rated current difference is increased, measuring the torque increment of the target motor includes: Starting from the initial current value, the current flowing to the clutch to be tested is controlled to increase by the rated current difference at preset time intervals, and after the rated current difference is increased, the torque increment of the first motor and the torque increment of the second motor are measured.

7. The method for measuring the clutch half-engagement point according to claim 6, characterized in that: In response to the torque increment of the target motor being greater than the increment threshold, measuring the pressure of the clutch to be tested, and determining the pressure value of the clutch to be tested as the half-clutch point of the clutch to be tested includes: In response to the torque increment of the first motor and / or the torque increment of the second motor being greater than the increment threshold, the pressure of the clutch to be tested is measured, and the pressure value of the clutch to be tested is determined as the half-clutch point of the clutch to be tested.

8. The method for measuring the clutch half-engagement point according to claim 1, characterized in that: After measuring the pressure of the clutch to be tested in response to the torque increment of the target motor being greater than the increment threshold, and determining the pressure value of the clutch to be tested as the half-clutch point of the clutch to be tested, the method further includes: Controlling the current flowing to the clutch to be tested to become zero; Repeating the process of starting from the initial current value, controlling the current to the clutch to be tested to increase the rated current difference at preset time intervals, and measuring the torque increment of the target motor until the current to the clutch to be tested becomes zero after the rated current difference is increased, until the number of repetitions reaches a threshold number; The obtained half-clutch points of all the clutches to be tested are averaged to obtain the target half-clutch point of the clutch to be tested.

9. The method for measuring the clutch half-engagement point according to claim 1, characterized in that: Before the method controls the rotation speed of the target motor to be a first rotation speed in response to the detection instruction of the half-clutch point of the clutch to be detected so that there is a rotation speed difference between the target motor and the output shaft, the method further includes: In response to the detection instruction of the half-clutch point of the clutch to be tested, the oil pump speed is controlled to maintain a second speed so that the main oil pressure of the transmission is maintained at a first oil pressure, and the current to the clutch to be tested is controlled to be zero, wherein the oil pump is used to maintain the main oil pressure of the transmission at the first oil pressure.

10. A device for measuring the half-engagement point of a clutch, characterized in that: The device comprises: a first control module, configured to control the rotation speed of the target motor to be a first rotation speed in response to a detection instruction of a half-clutch point of the clutch to be tested, so that there is a rotation speed difference between the target motor and an output shaft, wherein the target motor is connected to the clutch to be tested via the output shaft; A second control module is used to control the current flowing to the clutch to be tested to increase the rated current difference at preset time intervals starting from the initial current value, and to measure the torque increment of the target motor after the rated current difference is increased; The measuring module is used for measuring the pressure of the clutch to be measured in response to the torque increment of the target motor being greater than the increment threshold, and determining the pressure value of the clutch to be measured as the half-clutch point of the clutch to be measured.

11. The clutch half-engagement point measuring device according to claim 10, characterized in that: The target motor includes a first motor, the output shaft includes a first output shaft, and the first motor is connected to the clutch to be tested via the first output shaft; And the first control module includes: The first control submodule is used for controlling the rotation speed of the first motor to be the first rotation speed in response to the detection instruction of the half-clutch point of the clutch to be detected, so that there is a rotation speed difference between the first motor and the first output shaft.

12. The device for measuring the clutch half-engagement point according to claim 11, characterized in that: The second control module includes: The second control submodule is used to control the current flowing to the clutch to be tested to increase the rated current difference at preset time intervals starting from the initial current value, and to measure the torque increment of the first motor after the rated current difference is increased.

13. The device for measuring the clutch half-engagement point according to claim 12, characterized in that: The measuring module comprises: The first measuring submodule is used for measuring the pressure of the clutch to be tested in response to the torque increment of the first motor being greater than the increment threshold, and determining the pressure value of the clutch to be tested as the half-clutch point of the clutch to be tested.

14. The clutch half-engagement point measuring device according to claim 10, characterized in that: The target motor includes a first motor and a second motor, the output shaft includes a first output shaft and a second output shaft, and the first motor and the second motor are connected to the clutch to be tested through the first output shaft and the second output shaft respectively; And the first control module also includes: a third control submodule, configured to control the rotation speed of the first motor to be the first rotation speed in response to the detection instruction of the half-clutch point of the clutch to be detected, so that there is a rotation speed difference between the first motor and the first output shaft; The fourth control submodule is used to control the rotation speed of the second motor to be the first rotation speed in response to the detection instruction of the half-clutch point of the clutch to be tested, so that there is a rotation speed difference between the second motor and the second output shaft.

15. The clutch half-engagement point measuring device according to claim 14, characterized in that: The second control module further includes: The fifth control submodule is used to control the current to the clutch to be tested to increase the rated current difference at preset time intervals starting from the initial current value, and to measure the torque increment of the first motor and the torque increment of the second motor after the rated current difference is increased.

16. The device for measuring the clutch half-engagement point according to claim 15, characterized in that: The detection module also includes: The second measuring submodule is used to measure the pressure of the clutch to be tested in response to the torque increment of the first motor and / or the torque increment of the second motor being greater than the increment threshold, and determine the pressure value of the clutch to be tested as the half-clutch point of the clutch to be tested.

17. The clutch half-engagement point measuring device according to claim 10, characterized in that: The device also includes: A third control module, used for controlling the current flowing to the clutch to be tested to become zero; a repeated execution module, configured to repeatedly execute the process of controlling the current flowing to the clutch to be tested to increase the rated current difference at preset intervals starting from the initial current value, and measuring the torque increment of the target motor until the current flowing to the clutch to be tested becomes zero after the rated current difference is increased, until the number of repeated executions reaches a threshold number; The obtaining module is used to take an average value of all the obtained half-clutch points of the clutch to be tested to obtain a target half-clutch point of the clutch to be tested.

18. The device for measuring the clutch half-engagement point according to claim 10, characterized in that: The device also includes: The fourth control module is used to respond to the detection instruction of the half-clutch point of the clutch to be tested, control the oil pump speed to maintain the second speed so that the main oil pressure of the transmission is maintained at the first oil pressure, and control the current to the clutch to be tested to zero, wherein the oil pump is used to maintain the main oil pressure of the transmission at the first oil pressure.

19. A non-volatile computer-readable storage medium, characterized in that: The non-volatile computer-readable storage medium stores computer instructions, and the computer instructions are loaded and executed by a processor to implement the clutch half-engagement point detection method according to any one of claims 1 to 9.

Images