CN113700773B

CN113700773B - Self-learning method and device for position of half-joint point of clutch

Info

Publication number: CN113700773B
Application number: CN202111010732.5A
Authority: CN
Inventors: 祝浩; 徐家良; 刘加明
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2022-07-12
Anticipated expiration: 2041-08-31
Also published as: WO2023029890A1; CN113700773A

Abstract

The invention discloses a self-learning method and device for the position of a half-joint point of a clutch, and relates to the technical field of vehicle engineering. The self-learning method for the position of the half-joint point of the clutch comprises the following steps: judging that the vehicle meets the running condition of a clutch semi-combination point self-learning working condition; when the vehicle meets the running condition, recording the torque of the parallel driving engine, and fixing the torque of the engine as the torque of the parallel driving engine to be kept unchanged; adjusting the rotating speed of the engine through the generator until the difference value between the rotating speed of the engine and the target rotating speed of the engine is continuously kept in a first preset range within a first preset time, and recording the current torque of the generator as GmTqThd; and detecting a difference value between the real-time torque of the generator and the GmTqThd, sequentially increasing the current of the clutch electromagnetic valve by taking a preset step length as a unit, detecting the difference value, and taking the finally recorded current value of the clutch electromagnetic valve as a self-learning value of the self-learning working condition of the clutch half-joint point.

Description

Self-learning method and device for position of half-joint point of clutch

Technical Field

The invention relates to the technical field of vehicle engineering, in particular to a self-learning method and device for a clutch half-joint point position.

Background

For a hybrid vehicle with a dual-motor series-parallel configuration, when a clutch is separated, the whole vehicle is in a series driving mode, and the rotating speed of an engine is decoupled with the vehicle speed so that the engine works in an economic area; when the clutch is combined, the whole vehicle is in a parallel driving mode, and the rotating speed of the engine and the vehicle speed are in a fixed speed ratio relation; when the series driving mode is switched to the parallel driving mode, the clutch is required to be combined, the rotating speed of the engine is adjusted to be in a state of being synchronous with the vehicle speed through the generator usually because the rotating speed of the engine is asynchronous with the vehicle speed before the clutch is combined, and then the clutch is combined to reduce the impact of the whole vehicle in the clutch suction process.

However, if the engine speed is set by the generator to a process state that is completely synchronized with the vehicle speed, the speed control process takes a long time. Because the clutch has a gap and a certain volume exists in a pipeline related to the clutch, if the set pressure of the clutch is gradually increased from 0, the pressure build-up time of the clutch is too long, the whole series-parallel switching time is further prolonged, and the driving quality is influenced. And for a hybrid vehicle with a dual-motor series-parallel configuration, the engine speed is usually adjusted by a generator instead of completely eliminating the speed difference by clutch combination, so that a self-learning method of the half-combination point position of the traditional clutch cannot be referred to.

Therefore, a self-learning method and device for the position of the half-engaging point of the clutch are needed to solve the above problems.

Disclosure of Invention

The invention aims to provide a self-learning method and a device for the position of a semi-joint point of a clutch, which can obtain a more accurate and reliable current value of a clutch electromagnetic valve, realize the pressure control of the clutch more quickly and smoothly, and further reduce the actuation time of the clutch on the premise of keeping the NVH performance of the clutch combination.

In order to achieve the technical effects, the technical scheme of the invention is as follows:

a self-learning method for the position of a half-joint point of a clutch comprises the following steps: step S1, judging that the vehicle meets the running condition of the clutch semi-combination point self-learning working condition; step S2, when the vehicle meets the running condition, recording the torque of the parallel driving engine, and fixing the torque of the engine as the torque of the parallel driving engine to be kept unchanged; step S3, setting the target rotating speed of the engine as Vset, wherein the Vset is VTarget + V1, the VTarget is a rotating speed value of the driving motor when the vehicle enters a self-learning working condition of a clutch half-joint point, 40 < V1 < 60, adjusting the rotating speed V of the engine through the generator until the difference value between the rotating speed V of the engine and the target rotating speed Vset of the engine is continuously kept in a first preset range within a first preset time, and recording the current torque of the generator as GmTqThd; and S4, setting the initial value I1 of the current value of the clutch solenoid valve of the current clutch semi-joint point self-learning working condition to be I0-Is, setting I0 as the self-learning value of the current value of the clutch solenoid valve in the last clutch semi-joint point self-learning working condition, setting Is as the preset step length of the current of the clutch solenoid valve, detecting the difference value between the real-time torque of the generator and GmTqThd, when the difference value Is smaller than the preset value, sequentially increasing the current of the clutch solenoid valve by taking one preset step length as a unit and detecting the difference value until the difference value Is larger than the preset value or the increase times reach the preset times, and taking the finally recorded current value of the clutch solenoid valve as the self-learning value of the current clutch semi-joint point self-learning working condition.

Further, in step S2, step S3 and step S4, if the vehicle does not satisfy the operating condition of the clutch half-coupling point self-learning operating condition, the clutch half-coupling point self-learning operating condition is ended.

Further, the operating conditions include: the vehicle is in the series driving mode and receives a request for switching to the parallel driving mode, the speed of the vehicle is kept stable, and the number of times of completing the self-learning working condition of the clutch semi-combination point is less than three times in the driving process of the vehicle.

Further, still include: step S5, after the end of step S4, if the vehicle receives a request to switch to the parallel driving mode, the vehicle performs a series-parallel switching process.

Further, when the absolute value of the rate of change of the vehicle speed of the vehicle is maintained within a second preset range for a second preset time, the vehicle speed of the vehicle is kept stable.

Further, in the driving cycle process, the average value of the self-learning values of the self-learning working conditions of all the clutch semi-joint points is calculated, and the average value is used as the self-learning value of the self-learning working conditions of the clutch semi-joint points of the driving cycle and stored.

Further, the preset step size Is of the current of the clutch solenoid valve Is (Imax-I0)/10, and Imax Is the maximum value of the current value of the clutch solenoid valve.

Further, in the step S4, when Vset-V2 < V < Vset + V2, it is determined that the difference between the engine speed V and the target engine speed Vset is within the first preset range, 8 < V2 < 12.

Further, in step S4, after sequentially increasing the current of the clutch solenoid valve by taking a preset step as a unit, waiting for a preset time period, and then detecting a difference between the real-time torque of the generator and the GmTqThd.

A clutch half-engagement point position self-learning device, comprising: the rotating speed sensor is used for detecting the rotating speed of the engine; the torque sensor is used for detecting the real-time torque of the generator; the current sensor is used for detecting the current value of the clutch electromagnetic valve; and the control mechanism is in communication connection with the rotating speed sensor, the torque sensor and the current sensor and is used for executing the self-learning method of the position of the half-joint point of the clutch.

The invention has the following beneficial effects: when the clutch is not engaged, the output torque of the generator stabilizes the rotating speed of the engine, the load of the generator is constant at the moment, after the clutch is engaged, the load of the generator is increased due to the connection of the engine and the clutch, so that the torque of the generator is changed, the torque change of the generator can accurately correspond to the engaging position of the clutch, the load provided by the engine to the generator needs to be kept constant at the moment, and the accuracy of the current value of the electromagnetic valve of the clutch is improved. By sequentially increasing the preset step length, the reliability of current increase of the clutch electromagnetic valve can be better ensured, and the error between the current value of the clutch electromagnetic valve obtained by testing and the actual current value of the clutch at the half-joint point position is further ensured to be smaller. According to the self-learning method for the position of the half-joint point of the clutch, under the condition that the rotating speed of the engine is adjusted by the generator, the rotating speed of the engine is maintained by the generator, the pressure of the clutch is gradually increased, the load applied by the engine to the generator is ensured to be fixed, so that the characteristics that the clutch can participate in rotating speed maintenance when reaching the half-joint point position and cause the real-time torque of the generator to change can be utilized, and determines whether the clutch reaches a half-engagement point position according to a change in the real-time torque of the generator, thereby effectively improving the accuracy of the current value of the clutch electromagnetic valve corresponding to the position of the half-joint point of the clutch, thereby realizing more accurate and reliable current value of the clutch electromagnetic valve, more quickly and smoothly completing pressure control of the clutch, therefore, the pull-in time of the clutch is further reduced on the premise of keeping the NVH performance of the combined clutch.

The invention has the following beneficial effects: according to the self-learning device for the position of the half-joint point of the clutch, the self-learning method for the position of the half-joint point of the clutch can be executed, so that the accuracy of the current value of the clutch electromagnetic valve corresponding to the position of the half-joint point of the clutch can be effectively improved, the pressure control of the clutch can be completed faster and smoother according to the more accurate and reliable current value of the clutch electromagnetic valve, and the pull-in time of the clutch is further reduced on the premise of keeping the NVH performance of the combination of the clutch.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is a flow chart of a method for self-learning clutch half-engagement point positions according to an embodiment of the present invention;

FIG. 2 is a second flowchart of a self-learning method for the position of the clutch half-coupling point according to the embodiment of the present invention;

fig. 3 is a schematic structural diagram of a vehicle according to an embodiment of the present invention.

Reference numerals

1. An engine; 2. a generator; 3. a shock absorber; 4. a speed reduction mechanism; 5. a clutch; 6. a drive motor; 7. a differential gear.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means 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 with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

It is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The self-learning method and device for the position of the half-coupling point of the clutch according to the embodiment of the invention are described below with reference to fig. 1 to 3.

As shown in fig. 1-3, fig. 1 discloses a self-learning method for the position of a half-coupling point of a clutch, wherein a vehicle comprises a generator, an engine, a clutch and a driving motor, the output end of the engine is meshed with the output end of the generator and is connected with one end of the clutch, the other end of the clutch is connected with the driving motor, and the self-learning method for the position of the half-coupling point of the clutch comprises the following steps: step S1, judging that the vehicle meets the running condition of the clutch semi-combination point self-learning working condition; step S2, when the vehicle meets the running condition, recording the torque of the parallel driving engine, and fixing the torque of the engine as the torque of the parallel driving engine to be kept unchanged; step S3, setting the target rotating speed of the engine as Vset, wherein the Vset is VTarget + V1, the VTarget is a rotating speed value of the driving motor when the vehicle enters a clutch half-joint point self-learning working condition, 40 < V1 < 60, adjusting the rotating speed V of the engine through the generator until the difference value of the rotating speed V of the engine and the target rotating speed Vset of the engine is continuously kept in a first preset range in a first preset time, and recording the current torque of the generator as GmTqThd; and S4, setting the initial value I1 of the current value of the clutch solenoid valve in the clutch half-joint point self-learning working condition at the time as I0-Is, setting I0 as the self-learning value of the current value of the clutch solenoid valve in the clutch half-joint point self-learning working condition at the last time, setting Is as the preset step length of the current of the clutch solenoid valve, detecting the difference between the real-time torque of the generator and GmTqThd, when the difference Is smaller than the preset value, sequentially increasing the current of the clutch solenoid valve by taking one preset step length as a unit, detecting the difference until the difference Is larger than the preset value or the increasing times reach the preset times, and taking the finally recorded current value of the clutch solenoid valve as the self-learning value of the clutch half-joint point self-learning working condition at the time.

It is understood that, in step S1, it can be determined whether the clutch half-coupling point self-learning operation needs to be executed according to the actual operation condition of the vehicle, so that the execution accuracy of the clutch half-coupling point self-learning operation can be avoided.

In step S2, when the clutch is not engaged, the generator outputs torque to stabilize the rotation speed of the engine, and the load of the generator is constant, and after the clutch is engaged, the load of the generator is increased due to the connection of the engine and the clutch, which may cause the torque of the generator to change.

In step S3, since the output end of the engine and the driving motor are connected by the clutch, in order to convert the vehicle operating condition into the parallel driving mode, the rotation speed V of the engine and the rotation speed V of the driving motor need to be adjusted to be relatively close to each other to eliminate the rotation speed difference therebetween. In the embodiment, the target rotating speed of the engine is set to be Vset equal to VTarget + V1, VTarget is a rotating speed value of the driving motor when the vehicle enters a self-learning working condition of a clutch half-combination point, the rotating speed V of the engine is adjusted to be close to the rotating speed of the driving motor through the generator, the rotating speed V of the engine does not need to be completely adjusted to a rotating speed box of the driving motor, and therefore the final rotating speed difference is eliminated through closing of the clutch when the rotating speeds of the engine and the driving motor have a deviation value, and the speed regulating time of the rotating speed V of the engine is shortened. Specifically, in the present embodiment, V1 is preferably 50.

In step S4, the initial value of the current value of the clutch solenoid valve is set to be a self-learning value smaller than the previous clutch half-engagement point self-learning condition, so that it is possible to prevent the situation that the difference between the real-time torque of the generator and the GmTqThd is smaller than the preset value when the current clutch half-engagement point self-learning condition directly uses the self-learning value of the previous clutch half-engagement point self-learning condition, thereby ensuring the accuracy in adjusting the current value of the clutch solenoid valve. Meanwhile, since the current value of the clutch solenoid valve is increased to increase the pressure of the clutch and realize the engagement of the clutch, and the clutch is involved in the rotation speed maintenance when the clutch enters the half-engagement point position, the real-time torque of the generator changes, and therefore, the difference between the real-time torque of the generator and the GmTqThd can be tested under the condition of the fixed current value of the clutch solenoid valve to judge whether the clutch reaches the half-engagement point position. In step S4, by sequentially increasing the preset step length, the reliability of the current increase of the clutch solenoid valve can be better ensured, and thus it is ensured that the error between the current value of the clutch solenoid valve obtained by the test and the actual current value of the clutch at the half-junction point position is small. Meanwhile, in order to ensure the operation efficiency of the self-learning working condition, the current value of the final clutch electromagnetic valve can be used as the self-learning value of the self-learning working condition under the condition that the difference value is still smaller than the preset value after the increasing times reach the preset times.

According to the self-learning method for the position of the half-joint point of the clutch in the embodiment, under the condition that the rotating speed of the engine is adjusted by the generator, the rotating speed of the engine is maintained by the generator, the pressure of the clutch is gradually increased, the load applied by the engine to the generator is ensured to be fixed, so that the characteristics that the rotating speed maintenance is participated in when the clutch reaches the half-combination point position and the real-time torque of the generator is changed can be obtained, and determines whether the clutch reaches a half-engagement point position according to a change in the real-time torque of the generator, thereby effectively improving the accuracy of the current value of the clutch electromagnetic valve corresponding to the position of the half-joint point of the clutch, thereby realizing more accurate and reliable pressure control of the clutch according to the current value of the clutch electromagnetic valve, therefore, the pull-in time of the clutch is further reduced on the premise of keeping the NVH performance of the combined clutch.

Specifically, in this embodiment, the preset number is 3 to 5, preferably 4, and the specific number of the preset number may be determined according to actual requirements.

In some embodiments, in steps S2, S3, and S4, if the vehicle does not meet the operating conditions for the clutch half-junction self-learning condition, the present clutch half-junction self-learning condition is ended.

It can be understood that through the arrangement, the problems that the self-learning working condition of the clutch semi-combination point is executed under the condition that the vehicle runs unstably and the current value of the clutch electromagnetic valve with a large error is obtained can be effectively solved, so that the accurate and reliable current value of the clutch electromagnetic valve is well ensured, and the negative influence of the inaccurate current value of the clutch electromagnetic valve on the pressure control of the clutch is prevented.

In some embodiments, the operating conditions include: the vehicle is in the series driving mode and receives a request for switching to the parallel driving mode, the speed of the vehicle is kept stable, and the number of times of completing the self-learning working condition of the clutch semi-combination point is less than three times in the driving process of the vehicle.

It is understood that the vehicle speed of the vehicle is kept stable to ensure that the vehicle is in a stable running state, so as to prevent the current value of the clutch solenoid valve from being inaccurate due to the negative influence on the adjustment of the engine speed V in step S3. The vehicle being in the series drive mode and receiving a request to switch to the parallel drive mode ensures that the clutch closing action will be completed later, so as to better ensure that step S4 is performed smoothly. And the finishing times of the clutch semi-combination point self-learning working condition are less than three times, so that the invalid self-learning working condition in the driving process can be avoided, and the energy efficiency is saved.

In some embodiments, further comprising: step S5, after the end of step S4, if the vehicle receives a request to switch to the parallel driving mode, the vehicle performs a series-parallel switching process.

It can be understood that by the arrangement, normal and reliable switching of the vehicle in different driving modes can be ensured.

In some embodiments, the vehicle speed of the vehicle remains stable when the absolute value of the rate of change of the vehicle speed of the vehicle remains within a second preset range for a second preset time.

It is understood that, with the above arrangement, the vehicle speed of the vehicle can be considered to be kept stable. It should be noted that the second preset time and the second preset range may be determined according to the actual operating condition of the vehicle, and need not be described herein again.

In some embodiments, in the driving cycle, the average value of the self-learning values of the self-learning working conditions of all the clutch semi-combination points is calculated, and the average value is used as the self-learning value of the clutch semi-combination point self-learning working condition of the driving cycle and is stored.

It can be understood that the self-learning values of the clutch half-joint self-learning conditions obtained in the driving cycle process can be more accurate and reliable by performing average calculation processing on the self-learning values of all the clutch half-joint self-learning conditions obtained in the driving cycle process.

In addition, in the embodiment, the self-learning value of the clutch semi-joint point self-learning working condition is stored in the nonvolatile memory, so that the storage reliability of the self-learning value of the clutch semi-joint point self-learning working condition can be better ensured, and the self-learning value can be favorably called in the next driving cycle.

In some embodiments, the preset step size Is of the clutch solenoid current Is (Imax-I0)/10, where Imax Is the maximum value of the current value of the clutch solenoid.

It can be understood that the current adjustment times of the electromagnetic valve of the clutch are too many due to the fact that the preset step length is too small, the self-learning working condition of the half-combination point of the clutch is too early finished, and the reliability of the self-learning value is reduced; if the preset step length is too large, the difference value between the current values of the clutch electromagnetic valve which is adjusted is easily larger, and the problem that the more accurate self-learning value is positioned between the two adjustment values and the accuracy of the self-learning value is reduced easily occurs.

Through the calculation formula, the preset step length can be well ensured not to be too large or too small, so that a more accurate and reliable self-learning value can be obtained under the current clutch half-joint self-learning working condition, clutch pressure control can be completed faster and smoother, and clutch pull-in time is shortened.

In some embodiments, in the step S4, when Vset-V2 < V < Vset + V2, it is determined that the difference between the engine speed V and the target engine speed Vset is within a first preset range, 8 < V2 < 12.

It can be understood that, through the setting of the first preset range, the clutch closing can be executed when a certain deviation exists between the rotating speed V of the engine and the target rotating speed Vset of the engine, so that whether the clutch reaches the half-joint point position can be judged according to the torque change of the generator in the actual clutch closing process, the accuracy and the reliability of the closing time of the clutch are better ensured, and the reliability of the current value of the electromagnetic valve of the clutch is ensured. Specifically, in the present embodiment, V2 is 10, and in other embodiments of the present invention, V2 may also be determined according to actual operating conditions.

In some embodiments, as shown in fig. 2, in step S4, after sequentially increasing the current of the clutch solenoid valve by a preset step, the difference between the real-time torque of the generator and the GmTqThd is detected after waiting for a preset time period.

It can be understood that since the clutch is closed by the increased current of the clutch solenoid valve after the current value of the clutch solenoid valve is adjusted, the closing of the clutch and the change of the torque of the generator are completed after waiting for a preset time period. Therefore, in the present embodiment, since the preset time period is waited for, the detection accuracy of the difference between the real-time torque of the generator and the GmTqThd can be improved, and thus the reliability of the self-learning value of the current value of the clutch solenoid valve can be improved. Specifically, in this embodiment, the preset time period is 1 second, and the specific time period may be determined according to the actual working condition, without specific limitation.

The invention also discloses a self-learning device for the position of the half-joint point of the clutch, which comprises a rotating speed sensor, a torque sensor, a current sensor and a control mechanism. The rotation speed sensor is used for detecting the rotation speed of the engine. The torque sensor is used for detecting the real-time torque of the generator. The current sensor is used for detecting the current value of the clutch electromagnetic valve. The control mechanism is in communication connection with the speed sensor, the torque sensor and the current sensor, and is used for executing the self-learning method for the position of the half-joint point of the clutch.

According to the self-learning device for the position of the half-joint point of the clutch, the self-learning method for the position of the half-joint point of the clutch can be executed, so that the accuracy of the current value of the clutch electromagnetic valve corresponding to the position of the half-joint point of the clutch can be effectively improved, the pressure control of the clutch can be completed faster and smoother according to the more accurate and reliable current value of the clutch electromagnetic valve, and the pull-in time of the clutch is further reduced on the premise of keeping the NVH performance of the combination of the clutch.

As shown in fig. 3, the invention also discloses a vehicle, which comprises an engine 1, a generator 2, a shock absorber 3, a speed reducing mechanism 4, a clutch 5, a driving motor 6 and a differential 7. The output end of the engine 1 is connected with a damper 3, the other end of the damper 3 is meshed with the output end of the generator 2 through a speed reducing mechanism 4, the speed reducing mechanism 4 is connected with one end of a clutch 5, a driving motor 6 is connected with the other end of the clutch 5, and the output end of the driving motor 6 is connected with a differential mechanism 7.

Example (b):

the method for self-learning the position of the clutch half-coupling point according to one embodiment of the present invention will be described with reference to fig. 1 to 2.

The self-learning method for the position of the half-joint point of the clutch comprises the following steps of:

step S1, judging that the vehicle meets the running conditions of the clutch semi-joint point self-learning working condition, wherein the running conditions comprise: the vehicle is located in a series driving mode and receives a request for switching to a parallel driving mode, the speed of the vehicle is kept stable, the number of times of completing the self-learning working condition of the clutch semi-combination point is less than three times in the current driving process of the vehicle, and when the absolute value of the change rate of the speed of the vehicle is kept in a second preset range for a second preset time, the speed of the vehicle is kept stable;

step S2, when the vehicle meets the running condition, recording the torque of the parallel driving engine, and fixing the torque of the engine as the torque of the parallel driving engine to be kept unchanged;

step S3, setting the target rotating speed of the engine as Vset, wherein the Vset is VTarget + V1, the VTarget is a rotating speed value of the driving motor when the vehicle enters a self-learning working condition of a clutch half-joint point, 40 < V1 < 60, adjusting the rotating speed V of the engine through the generator until the difference value between the rotating speed V of the engine and the target rotating speed Vset of the engine is continuously kept in a first preset range within a first preset time, and recording the current torque of the generator as GmTqThd;

step S4, the initial value I1 of the current value of the clutch solenoid valve of the current clutch semi-joint point self-learning working condition Is I0-Is, I0 Is the self-learning value of the current value of the clutch solenoid valve in the previous clutch semi-joint point self-learning working condition, Is the preset step length of the current of the clutch solenoid valve, the difference value of the real-time torque of the generator and GmTqThd Is detected, when the difference value Is smaller than the preset value, the current of the clutch solenoid valve Is sequentially increased by taking one preset step length as a unit, the difference value Is detected until the difference value Is larger than the preset value or the increasing times reach the preset times, and the finally recorded current value of the clutch solenoid valve Is used as the self-learning value of the current clutch semi-joint point self-learning working condition; the preset step length Is of the current of the clutch solenoid valve Is (Imax-I0)/10, wherein Imax Is the maximum value of the current value of the clutch solenoid valve; when Vset-V2 is more than V and less than Vset + V2, judging that the difference value between the rotating speed V of the engine and the target rotating speed Vset of the engine is within a first preset range, wherein 8 is more than V2 and less than 12; sequentially increasing the current of a clutch solenoid valve by taking a preset step length as a unit, waiting for a preset time length, and then detecting the difference value between the real-time torque of the generator and the GmTqThd;

step S5, after the end of step S4, if the vehicle receives a request to switch to the parallel driving mode, the vehicle performs a series-parallel switching process.

In the description herein, references to the description of "some embodiments," "other embodiments," or the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.

Claims

1. A self-learning method for the position of a half-joint point of a clutch is characterized by comprising the following steps:

step S1, judging that the vehicle meets the running condition of the clutch semi-combination point self-learning working condition;

step S3 is performed to set the target engine speed to Vset, where Vset is equal to V_Target+V1，V_TargetAdjusting the rotating speed V of the engine through the generator until the difference value between the rotating speed V of the engine and the target rotating speed Vset of the engine is continuously kept in a first preset range within a first preset time, and recording the current torque of the generator as GmTqThd;

and S4, setting the initial value I1 of the current value of the clutch solenoid valve of the current clutch semi-joint point self-learning working condition to be I0-Is, setting I0 as the self-learning value of the current value of the clutch solenoid valve in the last clutch semi-joint point self-learning working condition, setting Is as the preset step length of the current of the clutch solenoid valve, detecting the difference value between the real-time torque of the generator and GmTqThd, when the difference value Is smaller than the preset value, sequentially increasing the current of the clutch solenoid valve by taking one preset step length as a unit and detecting the difference value until the difference value Is larger than the preset value or the increase times reach the preset times, and taking the finally recorded current value of the clutch solenoid valve as the self-learning value of the current clutch semi-joint point self-learning working condition.

2. The clutch half-coupling point position self-learning method as claimed in claim 1, wherein in step S2, step S3 and step S4, if the vehicle does not satisfy the operation condition of the clutch half-coupling point self-learning operating condition, the clutch half-coupling point self-learning operating condition is ended.

3. The clutch half-engagement point position self-learning method as claimed in claim 1, wherein the operating conditions include: the vehicle is in the series driving mode and receives a request for switching to the parallel driving mode, the speed of the vehicle is kept stable, and the number of times of completing the self-learning working condition of the semi-combination point of the clutch is less than three in the driving process of the vehicle.

4. The clutch half-engagement point position self-learning method of claim 3, further comprising:

5. The clutch half-coupling point position self-learning method as claimed in claim 3, wherein the vehicle speed of the vehicle is kept stable when an absolute value of a rate of change of the vehicle speed of the vehicle is maintained within a second preset range for a second preset time.

6. The clutch semi-coupling point position self-learning method according to claim 1, characterized in that during the current driving cycle, the average value of the self-learning values of the self-learning conditions of all the clutch semi-coupling points is calculated, and the average value is used as the self-learning value of the self-learning conditions of the clutch semi-coupling points of the current driving cycle and stored.

7. The clutch half-coupling point position self-learning method as claimed in claim 1, wherein the preset step size Is of the clutch solenoid current Is (Imax-I0)/10, Imax being the maximum value of the current value of the clutch solenoid.

8. The self-learning method for the clutch half-coupling point position as claimed in claim 1, wherein, in the step S4, when Vset-V2 < V < Vset + V2, it is determined that the difference between the rotational speed V of the engine and the target rotational speed Vset of the engine is within a first preset range, 8 < V2 < 12.

9. The clutch half-coupling point position self-learning method as claimed in claim 1, wherein in the step S4, after sequentially increasing the current of the clutch solenoid valve in units of a preset step, the difference between the real-time torque of the generator and the GmTqThd is detected after waiting for a preset time period.

10. A clutch half-engagement point position self-learning device, comprising:

the rotating speed sensor is used for detecting the rotating speed of the engine;

the torque sensor is used for detecting the real-time torque of the generator;

the current sensor is used for detecting the current value of the clutch electromagnetic valve;

a control mechanism in communication with the speed sensor, the torque sensor and the current sensor, the control mechanism for performing the self-learning method of clutch half-engagement point position as recited in any one of claims 1-9.