Clutch position adjustment method and device, and hybrid vehicle

Abstract

The present application relates to the technical field of vehicles, in particular to a clutch position adjustment method, device and hybrid vehicle. In the clutch position adjustment method, device and hybrid vehicle provided by the present application, in the clutch position adjustment method provided by the present application, the minimum combination position needs to be acquired before the clutch self-learning to determine whether the clutch is worn. After determining that the clutch is worn, the minimum combination position is updated, and then the clutch self-learning is performed according to the minimum combination position to adjust the sliding friction position of the clutch, so that the accuracy of the sliding friction position data can be improved. Moreover, the method improves the clutch position self-learning function on the basis of the original clutch position self-learning, and does not increase the hardware cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a clutch position adjustment method and device and a hybrid vehicle. BACKGROUND

[0002] The clutch is one of the important components of the vehicle powertrain system, mainly for controlling the on-off of power transmission. After the clutch is used for a period of time, the combination point and the sliding friction point positions change due to the thinning of the friction plate, which will have adverse effects on the acceleration performance, shift smoothness, starting process, etc. Therefore, the clutch self-learning function is added to correct the positions of the clutch combination point and the sliding friction point, so as to realize accurate control of the clutch position and ensure the vehicle performance.

[0003] The clutch self-learning generally has the following two ways: ① When the vehicle is offline, the assembly is disassembled, the clutch is replaced, or the driver has a clutch self-learning demand, a professional needs to control the upper computer to send signals or the driver needs to press the clutch self-learning mechanical button to trigger the clutch self-learning instruction, so as to control the vehicle to enter the clutch self-learning process. This way is greatly affected by human factors, and the self-learning period is uncontrollable; ② In order to solve the influence of clutch wear on vehicle driving, the HCU controls the vehicle to actively enter the clutch self-learning process. On the one hand, the vehicle cannot normally drive during the self-learning process, and if it is forcibly interrupted, the vehicle will still automatically enter the clutch self-learning process the next time the conditions are met, which may not meet the driver's intention. On the other hand, the mileage threshold is the result of offline calibration by the calibration personnel. The requirements for this threshold are different for different working conditions and different clutch wear. The existing technology cannot be corrected in real time.

[0004] Therefore, the existing technology proposes an online calibration method for the clutch position to ensure normal driving of the vehicle, but the existing technology online calibration method for the clutch position has the problem of inaccurate self-learning position.

[0005] Therefore, there is an urgent need for a clutch position adjustment method to solve the above technical problems. SUMMARY

[0006] The purpose of the present application is to provide a clutch position adjustment method, device and hybrid vehicle, which can improve the accuracy of clutch self-learning.

[0007] To achieve this purpose, the present application adopts the following technical solutions:

[0008] The clutch position adjustment method is suitable for a hybrid vehicle using a P2 hybrid system. The engine and the motor of the hybrid vehicle are connected in parallel. The clutch of the hybrid vehicle connects or disconnects the power transmission between the motor and the engine. The clutch is a pneumatic clutch, and the method comprises the following steps:

[0009] In a case that the hybrid vehicle is in the lower ON electric state, the gearbox is controlled to be disengaged, the motor speed is cleared, and the engine is stopped;

[0010] The current clutch actual minimum engagement position after the clutch position is stabilized and the previous corrected minimum engagement position are obtained, a difference between the current clutch actual minimum engagement position and the previous corrected minimum engagement position is obtained, in a case that the difference is not in a first preset range, the current clutch actual minimum engagement position is stored as a first sample and a first sample accumulation number is recorded, in a case that the first sample accumulation number is greater than or equal to a first preset value and each current clutch actual minimum engagement position obtained is in the first preset range, it is determined that the state of the hybrid vehicle meets the requirement;

[0011] The clutch is self-learned to adjust the slip position of the clutch.

[0012] As a preferred technical solution of the above clutch position adjustment method, before it is determined that the state of the hybrid vehicle meets the requirement, an average value A of the current clutch actual minimum engagement position is obtained, the average value A is used to replace the previous corrected minimum engagement position, and the first sample and the first sample accumulation number obtained are cleared.

[0013] As a preferred technical solution of the above clutch position adjustment method, the self-learning of the clutch includes:

[0014] In a case that the hybrid vehicle is in the lower ON electric state, the gearbox is controlled to be disengaged, the motor speed is cleared, and the engine is stopped;

[0015] In a case that the engine speed is in a second preset range, a current clutch slip position is stored as a second sample and a second sample accumulation number is recorded;

[0016] In a case that the second sample number is greater than or equal to a second preset value and each current clutch slip position is in a third preset range, the slip position is updated.

[0017] As a preferred technical solution of the above clutch position adjustment method, the updating of the slip position includes:

[0018] An average value B of the current clutch slip position is obtained, the average value B is used to replace the current slip position, and the slip position is updated.

[0019] As a preferred technical solution of the above clutch position adjustment method, in a case that the hybrid vehicle is in the lower ON electric state, the gearbox is controlled to be disengaged, the motor speed is cleared, and the engine is stopped;

[0020] As a preferred technical solution of the clutch position adjustment method, if the engine speed is in the third preset range, the current clutch position is stored as the second sample and the second sample accumulation quantity is recorded;

[0021] When the second sample accumulation quantity is greater than or equal to the second preset range and at least one of the obtained current clutch positions is not in the fifth preset range, a reminder information is sent to the driver to remind the driver to perform clutch self-learning through a mechanical button. When the sample accumulation quantity is equal to the second preset range and all the obtained current clutch positions are in the fifth preset range, the slip position is updated, and the clutch self-learning is completed.

[0022] After the clutch self-learning is completed, the second sample is cleared and the second sample accumulation quantity is cleared.

[0023] As a preferred technical solution of the clutch position adjustment method, before it is determined that the state of the hybrid vehicle meets the requirement, timing is started. If the clutch self-learning is not completed within a preset time, the driver is reminded to perform clutch self-learning through a mechanical button.

[0024] As a preferred technical solution of the clutch position adjustment method, the state of the hybrid vehicle meeting the requirement includes that the hybrid vehicle has no error, the gas pressure of a gas source of an actuator for controlling the pneumatic clutch is greater than a threshold value, and neither the engine speed nor the motor speed fluctuates.

[0025] The application also provides a clutch position adjustment device for performing the clutch position adjustment method of any one of the above solutions, comprising:

[0026] The processing module controls the gearshift to be disengaged, the motor speed to be cleared, and the engine to be stopped when the hybrid vehicle is in the lower ON gear state.

[0027] The first execution module obtains a current actual minimum engagement position of the clutch after the clutch position is stabilized and a minimum engagement position corrected last time, and obtains a difference value by subtracting the current actual minimum engagement position from the minimum engagement position corrected last time. When the difference value is not in a first preset range, the current actual minimum engagement position is stored as a first sample and a first sample accumulation quantity is recorded. When the first sample accumulation quantity is greater than or equal to a first preset value and all the obtained current actual minimum engagement positions are in the first preset range, it is determined that the state of the hybrid vehicle meets the requirement.

[0028] The second execution module performs clutch self-learning to adjust the slip position of the clutch.

[0029] The application further provides a hybrid vehicle adopting a P2 hybrid system, comprising an engine, a motor and a clutch, the engine and the motor being connected in parallel, the clutch of the hybrid vehicle being used to communicate or cut off power transmission between the motor and the engine, the clutch being a pneumatic clutch, and further comprising:

[0030] a controller;

[0031] a speed sensor used to detect a driving speed of the hybrid vehicle and send the detected driving speed to the controller;

[0032] a first rotation speed sensor used to detect a rotation speed of the engine and send the detected rotation speed of the engine to the controller;

[0033] a second rotation speed sensor used to detect a rotation speed of the motor and send the detected rotation speed of the motor to the controller;

[0034] a warning device used to send warning information;

[0035] a memory used to store one or more programs;

[0036] When the one or more programs are executed by the controller, the controller controls the hybrid vehicle to implement the clutch position adjustment method according to any one of the above solutions.

[0037] The application has the following beneficial effects:

[0038] In the clutch position adjustment method, device and hybrid vehicle provided by the application, the maximum separation position of the clutch is not affected after the clutch is worn, the minimum combination position and the sliding friction position are synchronously reduced, and the reduced stroke is positively correlated with the wear amount of the clutch, so that the active judgment of the minimum combination position is easier to achieve, and therefore, the change of the minimum combination position can intuitively reflect the actual wear degree of the clutch. Therefore, in the clutch position adjustment method provided by the application, the minimum combination position needs to be acquired to determine whether the clutch is worn before the clutch self-learning. After the wear of the clutch is determined, the minimum combination position is updated, and then the clutch self-learning is performed according to the minimum combination position to adjust the sliding friction position of the clutch, so that the accuracy of the sliding friction position data can be improved. Moreover, the method improves the clutch position self-learning function on the basis of the original clutch position self-learning function, and does not increase the hardware cost. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application. Obviously, the drawings described below only show some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from the contents of the embodiments of the present application and these drawings without any creative effort.

[0040] Figure 1 The flow of the clutch position adjustment method provided by the embodiment of the present application Figure 1 ;

[0041] Figure 2 The flow of the clutch position adjustment method provided by the embodiment of the present application Figure 2 ;

[0042] Figure 3 The flow of the clutch position adjustment method provided by the embodiment of the present application Figure 3 ;

[0043] Figure 4 The block diagram of the clutch position adjustment device provided by the embodiment of the present application

[0044] Figure 5 The block diagram of the hybrid vehicle provided by the embodiment of the present application

[0045] In the drawings:

[0046] 401, processing module; 402, first execution module; 403, second execution module;

[0047] 501, engine; 502, motor; 503, clutch; 504, controller; 505, speed sensor; 506, first rotation speed sensor; 507, second rotation speed sensor; 508, warning device; 509, memory; 510, timing device. DETAILED DESCRIPTION

[0048] The present application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that for the convenience of description, only the parts related to the present application are shown in the drawings, but not all the structures.

[0049] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0051] In the description of the present embodiment, the terms "up", "down", "right", and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0052] The prior art can calibrate the clutch position online to ensure normal driving of the vehicle, but the prior art has the problem that the self-learning clutch position is inaccurate. At the same time, a relatively cumbersome preparation work is required before the clutch self-learning, resulting in a relatively cumbersome actual self-learning work. Therefore, the embodiment of the present application provides a clutch position adjustment method, device and hybrid vehicle, which can realize online calibration of the clutch position of the hybrid vehicle, and the calibrated clutch position is more accurate, and the steps before clutch self-learning are simplified.

[0053] To this end, the embodiment provides a clutch position adjustment method to solve the above problems. The clutch position adjustment method can be executed by a clutch position adjustment device, which can be realized by software and / or hardware and integrated in a hybrid vehicle. The engine and motor of the hybrid vehicle are connected in parallel, and the hybrid vehicle specifically adopts a P2 hybrid system.

[0054] The clutch includes a driving disc, a driven disc and an actuator driving the driving disc and the driven disc to combine, the position of the clutch refers to the position of the driving disc relative to the driven disc, the actuator such as an electric push rod and a hydraulic cylinder can be controlled by a controller to control the position of the clutch. Among them, the clutch has a maximum separation position, a sliding point and a combination position during combination and separation. Among them, when the clutch is at the maximum separation position, the distance between the driving disc and the driven disc is maximum, and there is no torque transmission between the driving disc and the driven disc; when the clutch is at the sliding point, the driving disc and the driven disc slide relative to each other, and there is friction torque transmission between them; when the clutch is at the combination position, the driving disc and the driven disc do not slide relative to each other, they keep synchronization, and the transmitted torque is no longer dynamic friction torque.

[0055] Figure 1 The clutch position adjustment method provided by the embodiment of the application Figure 1 As shown in Figure 1 , the clutch position adjustment method comprises the following steps:

[0056] S101, in the case that the hybrid vehicle is in the lower ON gear electric state, the gearbox is controlled to be disengaged, the motor speed is zeroed and the engine is stopped;

[0057] S102, the current actual minimum combination position of the clutch after the position of the clutch is stabilized and the minimum combination position corrected last time are obtained, the current actual minimum combination position of the clutch and the minimum combination position corrected last time are subtracted to obtain a difference value, when the difference value is not within a first preset range, the current actual minimum combination position of the clutch is stored as a first sample and the first sample accumulation quantity is recorded, when the first sample accumulation quantity is greater than or equal to a first preset value and each current actual minimum combination position obtained is within the first preset range, it is determined that the state of the hybrid vehicle meets the requirements;

[0058] S103, the clutch is self-learned to adjust the sliding position of the clutch.

[0059] After the clutch wears, the maximum separation position is not affected, the minimum combination position and the sliding position are reduced synchronously, and the reduced stroke is positively correlated with the wear amount of the clutch, so that the active judgment of the minimum combination position is easier to achieve, and therefore, the change of the minimum combination position can intuitively reflect the actual wear degree of the clutch. Therefore, in the clutch position adjustment method provided by the embodiment of the application, the minimum combination position needs to be obtained before the clutch self-learning to determine whether the clutch is worn. After determining that the clutch is worn, the minimum combination position is updated, and then the clutch self-learning is performed according to the minimum combination position to adjust the sliding position of the clutch, which can improve the accuracy of the sliding position data. Moreover, the method improves the clutch position self-learning function on the basis of the original clutch position self-learning function, without increasing the hardware cost.

[0060] In addition, the more samples of the minimum engagement position of the clutch in the method, the more accurate the standard position of the adjusted minimum engagement position of the clutch, and the higher the fault tolerance of the entire adjustment process is ensured.

[0061] Further, before determining that the state of the hybrid vehicle meets the requirement, an average value A of the current actual minimum engagement position of the clutch is obtained, the average value A replaces the previously corrected minimum engagement position, that is, the minimum engagement position stored in the existing controller is corrected and replaced, and the obtained first sample and the cumulative number of the first sample are cleared. This not only reduces the memory occupied by the data, but also prevents the current first sample data from affecting the related judgment when subsequent minimum engagement position judgment is performed, so that the accuracy of the data is ensured.

[0062] In some embodiments, when the hybrid vehicle is in the lower ON electric state, the gearbox is controlled to be disengaged, the motor speed is controlled to be zero, and the engine is controlled to be stopped. The engagement valve also needs to be controlled to work until the clutch position is stable, and the engagement valve is closed. After the engagement valve is closed, the minimum engagement position of the clutch when the clutch position is stable is obtained, and the corrected minimum engagement position is obtained. The pneumatic clutch has an engagement valve. The function of the engagement valve is to release the air in the clutch actuator, so that the clutch pressure plate returns to the original position, and the clutch is engaged. The electromagnetic valve needs to work only when the clutch needs to act. After the position is stable, the electromagnetic valve can stop working. The specific structure of the engagement valve is a prior art and will not be described in detail.

[0063] Specifically, when the hybrid vehicle is in the lower ON electric state, the engagement valve is opened. After the engagement valve is opened, the clutch should move to the minimum engagement point. When the clutch position is stable, the actual minimum engagement position of the clutch is subtracted from the minimum engagement position stored in the controller. If the difference is within a first preset range, the actual minimum engagement position of the clutch substantially coincides with the stored minimum engagement position, and the clutch is in a normal working state. If the difference is not within the first preset range, it indicates that the clutch needs to be self-learned. This facilitates subsequent adjustment of the minimum engagement point of the actual minimum engagement position of the clutch that is not within the first preset range, and further ensures that the minimum engagement position of the clutch of the hybrid vehicle after adjustment is relatively accurate.

[0064] Figure 2 The flow of the clutch position adjustment method provided by the embodiments of the present application Figure 2 As shown in Figure 3 The clutch position adjustment method comprises the following steps:

[0065] S201, the hybrid vehicle is in the lower ON electric state, and the gearbox is controlled to be disengaged, the motor speed is controlled to be zero, and the engine is controlled to be stopped.

[0066] S202, controlling the engagement valve to work until the clutch position is stable, and the engagement valve is closed;

[0067] S203, obtaining the current clutch actual minimum engagement position after the clutch position is stable, and the difference between the current clutch actual minimum engagement position and the minimum engagement position corrected last time stored in the controller;

[0068] S204, judging whether the difference is within a first preset range, if yes, executing S201, if no, executing S205;

[0069] S205, storing the current clutch actual minimum engagement position as a first sample, and recording the cumulative number of the first sample;

[0070] S206, judging whether the cumulative number of the first sample is greater than or equal to a first preset value, if yes, executing S207, if no, executing S201;

[0071] S207, judging whether the stored current clutch actual minimum engagement position is within the first preset range, if yes, executing S208, if no, executing S209;

[0072] S208, updating the clutch minimum engagement position, and clearing the stored first sample and the cumulative number of the first sample;

[0073] S209, reminding the driver to perform clutch self-learning through a mechanical button to update the clutch minimum engagement position, and clearing the stored first sample and the cumulative number of the first sample after the clutch self-learning is completed.

[0074] Further, the clutch self-learning comprises:

[0075] When the hybrid mode is switched from the pure electric mode, the clutch is engaged to the slip position by driving in reverse;

[0076] When the engine speed is within a second preset range, the current clutch slip position is stored as a second sample, and the cumulative number of the second sample is recorded;

[0077] When the cumulative number of the second sample is greater than or equal to a second preset value, and the current clutch slip position is within a third preset range, the slip position is updated.

[0078] By comparing the cumulative number of the second sample with the second preset value, it can be determined that the cumulative number of the second sample has accumulated to a certain value. The more the sample accumulation, the more accurate the standard position of the self-learned clutch slip position, which ensures a high fault tolerance rate in the entire adjustment process.

[0079] Specifically, the updating of the slip position comprises:

[0080] An average value B of the current clutch slip position is obtained, and the average value B is replaced by the current slip position, and the slip position is updated.

[0081] By replacing the average value B of the current clutch slip position by the current slip position, clutch self-learning can be realized, and stable clutch engagement can be ensured, and the stability and safety of driving can be ensured.

[0082] It should be noted that, before it is determined that the state of the hybrid vehicle meets the requirements, the clutch dynamic self-learning is triggered, at which time the timing starts, and if the clutch self-learning is not completed within the preset time, the driver is reminded to manually perform self-learning. Since the clutch dynamic self-learning (i.e., the clutch self-learning during driving) is triggered, it is still necessary to determine whether the state of the hybrid vehicle meets the requirements, and if the state of the hybrid vehicle meets the requirements, the clutch self-learning can be realized, i.e., the self-learning of the clutch position can be realized during driving. However, if the self-learning is not realized during driving, it is considered that the clutch self-learning condition is not triggered, and at this time, the driver needs to be reminded to perform clutch self-learning through a mechanical button in a non-driving state.

[0083] In some embodiments, the hybrid vehicle has no error, the gas pressure of the gas source of the actuator for controlling the pneumatic clutch is greater than a threshold value, and both the engine speed and the motor speed are not fluctuating. Both the engine speed and the motor speed not fluctuating can be understood as the engine speed being within a sixth preset range and the motor speed being within a seventh preset range. In this way, it indicates that the vehicle is in a good driving process, and the clutch self-learning can be performed to update the slip position.

[0084] Since the driving reverse drag is adopted when switching from the pure electric mode to the hybrid mode, the clutch is engaged to the slip position at this time. The current clutch slip position is obtained, and it is determined whether the engine speed when engaged to the slip position is within a second preset range. If the engine speed is not within the second preset range and the engine speed is less than the minimum value of the second preset range, it indicates that the current position of the clutch is not at the slip position, and the sample has a large error. Therefore, the clutch is controlled to move to the clutch slip position by a preset step length, so that the engine speed is within the second preset range. The preset step length is a constant value. In this way, the current clutch slip position obtained can be more accurate, and the inaccuracy of obtaining the current clutch slip position is prevented.

[0085] If the engine speed is within the second preset range, the current clutch position is stored as a second sample and the cumulative number of the second sample is recorded. At this time, it indicates that the current clutch slip position is a valid value.

[0086] If the clutch does not wear during use, the clutch slip position in the memory is the slip position of the current clutch slip point, at this time, the driving motor is connected with the engine through the clutch, and the engine can be started by rotating the driving motor. If the clutch wears, the clutch slip position in the memory deviates from the current clutch slip position, and the engine cannot be started by rotating the driving motor.

[0087] Since the hybrid vehicle is limited to improve the driving reverse drag priority, the driving reverse drag is adopted when the next pure electric mode is switched to the hybrid mode, the clutch is moved to the slip position, and it is judged whether the current clutch slip position is in the fifth preset range. If so, it means that the current clutch slip position obtained each time the driving reverse drag is obtained is a valid value, and there is no large error.

[0088] When the second sample accumulation number is greater than or equal to the second preset range and at least one of the obtained current clutch positions is not in the fifth preset range, a reminder information is sent to the driver to remind the driver to perform clutch self-learning through a mechanical key. When the driver performs clutch self-learning through a mechanical key, the hybrid vehicle is in a non-driving state.

[0089] When the sample accumulation number is greater than or equal to the second preset range and each of the obtained current clutch positions is in the fifth preset range, the slip position is updated, and the clutch self-learning is completed.

[0090] It should be noted that after the clutch self-learning is completed, the samples are cleared and the sample accumulation number is cleared. After the clutch self-learning, the standard position of the clutch has changed, so the clutch slip position obtained before the self-learning is not suitable for the clutch for completing the self-learning. Therefore, the samples are cleared and the sample accumulation number is cleared after the self-learning is completed, and the timer is also cleared to prepare for the next self-learning of the controller.

[0091] Figure 3 The clutch position adjustment method provided by the embodiment of the present application Figure 3 As shown in ​ The clutch position adjustment method comprises the following steps:

[0092] S301, the vehicle state meets the requirement;

[0093] S302, the driving reverse drag priority is improved, and the driving reverse drag is adopted when the pure electric mode is switched to the hybrid mode, so that the clutch is combined to the slip position;

[0094] S303, it is judged whether the engine speed is in the second preset range, if so, S304 is executed, if not, S308 is executed;

[0095] S304, store the current clutch slip position as the second sample, and record the second sample accumulation number;

[0096] S305, whether the second sample accumulation number is greater than or equal to the second preset value, if yes, execute S306, if no, execute S301;

[0097] S306, whether each current clutch slip position is within the third preset range, if yes, execute S307, if no, execute S310;

[0098] S307, update the clutch slip point, and the clutch completes self-learning;

[0099] S308, judge whether the engine speed is less than the minimum value of the second preset range, if yes, execute S309, if no, execute S301;

[0100] S309, the clutch moves to the minimum engagement position by a preset step, and execute S303;

[0101] S310, remind the driver to perform clutch self-learning through a mechanical button, and clear the stored current clutch position, timing time and second sample accumulation number after the self-learning is completed.

[0102] It should be noted that the first preset value, the second preset value, the first preset range, the second preset range and the third preset range are all obtained through calibration. In the embodiment, there is no specific limitation.

[0103] In the embodiment of the application, a clutch position adjustment device is also provided, which is used to execute the clutch position adjustment method provided by the embodiment. The clutch position adjustment device comprises a processing module 401, a first execution module 402 and a second execution module 403. The first processing module 401 is used to control the gear box to be disengaged, the motor speed to be cleared and the engine to be stopped when the hybrid vehicle is in the lower ON gear electric state. The first execution module 402 is used to obtain the current clutch actual minimum engagement position after the clutch position is stabilized and the minimum engagement position corrected last time, and to obtain a difference value by subtracting the current clutch actual minimum engagement position from the minimum engagement position corrected last time. When the difference value is not within the first preset range, the current clutch actual minimum engagement position is stored as a first sample and a first sample accumulation number is recorded. When the first sample accumulation number is greater than or equal to a first preset value and each current clutch actual minimum engagement position obtained is within the first preset range, it is determined that the state of the hybrid vehicle meets the requirements. The second execution module 403 is used for clutch self-learning to adjust the slip position of the clutch.

[0104] Further, the clutch position adjusting device further comprises a timing module, which is configured to start timing before the state of the hybrid vehicle meets the requirement, and to remind the driver to manually perform self-learning if the clutch self-learning is not completed within a preset time.

[0105] The maximum disengagement position of the clutch is not affected after the wear of the clutch, the minimum engagement position and the slip position are synchronously reduced, and the reduced stroke is positively correlated with the wear amount of the clutch, so that the active judgment of the minimum engagement position is easier to achieve, and therefore, the change of the minimum engagement position can directly reflect the actual wear degree of the clutch. Therefore, in the clutch position adjusting device provided in the embodiment, the minimum engagement position needs to be acquired before the clutch self-learning to determine whether the clutch is worn. After determining that the clutch is worn, the minimum engagement position is updated, and then the clutch self-learning is performed according to the minimum engagement position to adjust the slip position of the clutch, so that the accuracy of the slip position data can be improved. Moreover, the method improves the clutch position self-learning function on the basis of the original clutch position self-learning, without increasing the hardware cost.

[0106] In the embodiment, a hybrid vehicle is also provided, which adopts a P2 hybrid system and comprises an engine 501, a motor 502, a clutch 503, a controller 504, a speed sensor 505, a first rotation speed sensor 506, a second rotation speed sensor 507, a warning device 508, and a timing device 510. The engine 501 and the motor 502 are connected in parallel, the clutch 503 of the hybrid vehicle is used to connect or cut off the power transmission between the motor 502 and the engine 501, and the clutch 503 is a pneumatic clutch. The speed sensor 505 is configured to detect the driving speed of the hybrid vehicle and send the detected driving speed to the controller 504. The first rotation speed sensor 506 is configured to detect the rotation speed of the engine 501 and send the detected rotation speed of the engine 501 to the controller 504. The second rotation speed sensor 507 is configured to detect the rotation speed of the motor 502 and send the detected rotation speed of the motor 502 to the controller 504. The warning device 508 is configured to issue a warning information. The timing device 510 is configured to start timing before determining that the state of the hybrid vehicle meets the requirement.

[0107] The memory 509 is a computer readable storage medium, which can be used to store software programs, computer executable programs and modules, such as program instructions / modules corresponding to the clutch position adjusting method in the embodiment. The controller 504 executes various functional applications and data processing of the vehicle by running the software programs, instructions and modules stored in the memory 509, that is, implements the clutch position adjusting method in the above embodiment.

[0108] The memory 509 mainly includes a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required by a function; the data storage area can store data created according to the use of the terminal, etc. In addition, the memory 509 can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state memory device. In some examples, the memory 509 can further include a memory remotely disposed relative to the controller 504, which can be connected to the vehicle through a network. Examples of the above network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0109] The hybrid vehicle provided by the embodiment of the present application belongs to the same inventive concept as the clutch position adjustment method provided by the above embodiment, and the technical details not described in detail in the present embodiment can be referred to the above embodiment, and the present embodiment has the same beneficial effects as the clutch position adjustment method.

[0110] In addition, the above are only the preferred embodiments of the present application and the technical principles applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments herein, and those skilled in the art can make various obvious changes, readjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A clutch position adjustment method for a hybrid vehicle using a P2 hybrid system, wherein an engine and a motor of the hybrid vehicle are connected in parallel, a clutch of the hybrid vehicle connects or disconnects power transmission between the motor and the engine, and the clutch is a pneumatic clutch, characterized in that, The method comprises the following steps: In the case that the hybrid vehicle is in the lower ON gear electric state, the gearbox is controlled to be disengaged, the motor speed is zeroed, and the engine is stopped; The current clutch actual minimum engagement position after the clutch position is stabilized and the previous corrected minimum engagement position are obtained, a difference value is obtained by subtracting the current clutch actual minimum engagement position from the previous corrected minimum engagement position, when the difference value is not within a first preset range, the current clutch actual minimum engagement position is stored as a first sample and a first sample accumulation number is recorded, when the first sample accumulation number is greater than or equal to a first preset value and each current clutch actual minimum engagement position obtained is within the first preset range, it is determined that the state of the hybrid vehicle meets the requirements; The clutch is self-learned to adjust the slip position of the clutch.

2. The clutch position adjustment method according to claim 1, characterized by, Before it is determined that the state of the hybrid vehicle meets the requirements, an average value A of the current clutch actual minimum engagement position is obtained, the average value A is used to replace the previous corrected minimum engagement position, and the first sample and the first sample accumulation number are cleared.

3. The clutch position adjustment method according to claim 1, characterized by, The clutch self-learning comprises: When the hybrid mode is switched from the pure electric mode, the vehicle reverse drag is adopted to make the clutch engage to the slip position; When the engine speed is within a second preset range, a current clutch slip position is stored as a second sample and a second sample accumulation number is recorded; When the second sample accumulation number is greater than or equal to a second preset value and each current clutch slip position is within a third preset range, the slip position is updated.

4. The clutch position adjustment method according to claim 3, characterized by, The updating of the slip position comprises: An average value B of the current clutch slip position is obtained, the average value B is used to replace the current slip position, and the slip position updating is completed.

5. The clutch position adjustment method according to claim 3, characterized by, When the hybrid mode is switched from the pure electric mode, the vehicle reverse drag is adopted, the clutch engages to the slip position, and it is determined whether the engine speed when the clutch engages to the slip position is within the second preset range, if the engine speed is not within the second preset range and the engine speed is less than a minimum value of the second preset range, the clutch is controlled to move to the clutch position by a preset step, and the preset step is a constant value.

6. The clutch position adjustment method according to claim 5, characterized by, If the engine speed is within the second preset range, the current clutch slip position is stored as the second sample and the second sample accumulation number is recorded. When the second sample accumulation number is greater than or equal to the second preset range and each current clutch position obtained is not within the third preset range, a reminder information is sent to the driver to remind the driver to perform the clutch self-learning through a mechanical key, when the sample accumulation number is greater than or equal to the second preset range and each current clutch position obtained is within the third preset range, the slip position is updated, and the clutch self-learning is completed. After the clutch self-learning is completed, the second sample is cleared and the second sample accumulation number is cleared.

7. The clutch position adjustment method according to any one of claims 1 to 6, characterized by, Before it is determined that the state of the hybrid vehicle meets the requirements, the timing is started, if the clutch self-learning is not completed within a preset time, the driver is reminded to perform the clutch self-learning through the mechanical key.

8. The clutch position adjustment method according to any one of claims 1 to 6, characterized by, The state of the hybrid vehicle meeting the requirements comprises that the hybrid vehicle has no error, the air pressure of an air source of an execution mechanism for controlling the pneumatic clutch is greater than a threshold value, and the engine speed and the motor speed have no fluctuation.

9. Clutch position adjusting device, characterized in that A clutch position adjustment method for performing the method of any one of claims 1-8, comprising: a processing module, in the case that the hybrid vehicle is in the lower ON gear electric state, controlling the gearbox to disengage, the motor speed to zero, and the engine to stop; a first execution module, obtaining a current clutch actual minimum engagement position after the clutch position is stabilized and a minimum engagement position corrected last time, and obtaining a difference value by subtracting the current clutch actual minimum engagement position from the minimum engagement position corrected last time, when the difference value is not within a first preset range, storing the current clutch actual minimum engagement position as a first sample and recording a first sample accumulation number, when the first sample accumulation number is greater than or equal to a first preset value and each current clutch actual minimum engagement position obtained is within the first preset range, determining that the state of the hybrid vehicle meets the requirements; a second execution module, the clutch self-learning to adjust the slip position of the clutch.

10. A hybrid vehicle employing a P2 hybrid system, comprising: an engine, a motor, and a clutch, the engine and the motor being connected in parallel, the clutch of the hybrid vehicle communicating or cutting off power transmission between the motor and the engine, the clutch being a pneumatic clutch, characterized in that, further comprising: a controller; a speed sensor for detecting the driving speed of the hybrid vehicle and sending the detected driving speed to the controller; a first speed sensor for detecting the speed of the engine and sending the detected speed of the engine to the controller; a second speed sensor for detecting the speed of the motor and sending the detected speed of the motor to the controller; a warning device for issuing warning information; a memory for storing one or more programs; when the one or more programs are executed by the controller, the controller controls the hybrid vehicle to implement the clutch position adjustment method of any one of claims 1-8.

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