阅读说明：本技术 一种湿式dct电磁阀的卡滞检测的控制方法 (Control method for jamming detection of wet DCT (discrete cosine transformation) electromagnetic valve ) 是由 戴冬华 张友皇 陈加超 王烨 王祺明 刘建斌 赵知立 孟庆健 于 2021-08-12 设计创作，主要内容包括：本发明提供一种湿式DCT电磁阀的卡滞检测的控制方法,包括：获取车辆的运行车速、离合器的实际扭矩和油门踏板开度,以识别车辆及变速箱的运行状态。在所述运行车速小于设定车速阈值、所述实际扭矩小于设定扭矩阈值且所述油门踏板开度小于设定开度阈值时确定当前车辆需要进行离合器压力控制电磁阀的卡滞检测。获取离合器的期望压力和实际压力,并根据所述期望压力和所述实际压力的差值判断离合器压力控制电磁阀是否卡滞,如果是,则对存在卡滞的电磁阀进行冲洗。该方法能避免离合器因电磁阀卡滞出现压力异常,严重时导致车辆报故障和动力中断,能提高汽车使用的安全性。(The invention provides a control method for jamming detection of a wet DCT electromagnetic valve, which comprises the following steps: and acquiring the running speed of the vehicle, the actual torque of the clutch and the opening degree of an accelerator pedal so as to identify the running states of the vehicle and the gearbox. And determining that the current vehicle needs to carry out the jamming detection of the clutch pressure control electromagnetic valve when the running vehicle speed is less than a set vehicle speed threshold, the actual torque is less than a set torque threshold and the accelerator pedal opening is less than a set opening threshold. And acquiring expected pressure and actual pressure of the clutch, judging whether the clutch pressure control solenoid valve is blocked according to the difference value of the expected pressure and the actual pressure, and flushing the solenoid valve with the blockage if the clutch pressure control solenoid valve is blocked. The method can avoid abnormal pressure of the clutch due to the clamping stagnation of the electromagnetic valve, and can prevent the vehicle from reporting faults and power interruption when the pressure is serious, and can improve the safety of the use of the vehicle.)

1. A control method for detecting jamming of a wet DCT electromagnetic valve is characterized by comprising the following steps:

acquiring the running speed of the vehicle, the actual torque of a clutch and the opening degree of an accelerator pedal so as to identify the running states of the vehicle and a gearbox;

when the running vehicle speed is smaller than a set vehicle speed threshold, the actual torque is smaller than a set torque threshold, and the opening of the accelerator pedal is smaller than a set opening threshold, determining that the current vehicle needs to carry out jamming detection on a clutch pressure control electromagnetic valve;

and acquiring expected pressure and actual pressure of the clutch, judging whether the clutch pressure control solenoid valve is blocked according to the difference value of the expected pressure and the actual pressure, and flushing the solenoid valve with the blockage if the clutch pressure control solenoid valve is blocked.

2. The method of controlling seizure detection in a wet DCT solenoid according to claim 1, further comprising:

switching the work of the clutch corresponding to the clamping stagnation electromagnetic valve to another clutch which is not clamped stagnation so as to ensure the normal running of the vehicle;

and closing the safety valve of the clutch corresponding to the clamping stagnation electromagnetic valve to release the pressure of the clamping stagnation clutch, so that the clamping stagnation clutch is in a fully opened state.

3. The method for controlling the seizure detection of the wet DCT solenoid according to claim 2, further comprising:

according to the current running state of the vehicle, the shifting fork is used for shifting the non-clamping clutch according to the required gear, so that the non-clamping clutch is filled with oil and combined to keep the normal running of the clutch.

4. The method of controlling stuck detection of a wet DCT solenoid as recited in claim 3, wherein said flushing the stuck solenoid comprises:

judging whether the actual pressure is smaller than a set pressure threshold value or not to confirm that the clutch corresponding to the clamping stagnation electromagnetic valve is opened;

picking a synchronizer shifting fork on a shaft system corresponding to the clamping stagnation electromagnetic valve to a neutral position, setting the current of the clutch pressure control electromagnetic valve to reach the maximum rated current and continue for a set time, and then setting the current of the clutch pressure control electromagnetic valve to be a set minimum current value and continue for the set time;

and repeatedly setting the current and the duration of the electromagnetic valve, and stopping when the set times are reached.

5. The method of controlling seizure detection in a wet DCT solenoid according to claim 4, wherein said flushing the seized solenoid further comprises:

and controlling the current of the electromagnetic valve according to a set pulse square wave by PWM pulse wave to control the pressure of the clutch, so that the current of the clamped electromagnetic valve is alternately changed between 1500mA and 0 according to a set interval, wherein the pulse number of the pulse square wave is equal to the set times.

6. The method of controlling seizure detection in a wet DCT solenoid according to claim 5, further comprising:

after the washing times reach the set times, judging whether gear shifting is needed or not according to the current running state of the vehicle;

if so, shifting the gear to the clutch with the clamping stagnation again to drive the vehicle normally;

if not, the clutch corresponding to the clamping stagnation electromagnetic valve keeps the state after the washing is finished unchanged until the vehicle state changes and gear shifting switching is required.

7. The method of claim 6, wherein the determining whether the clutch pressure control solenoid valve is stuck based on the difference between the desired pressure and the actual pressure comprises:

and when the difference is greater than a set pressure threshold value and the duration is greater than a set value, determining that the pressure control electromagnetic valve of the clutch is blocked.

8. The method of claim 7, wherein the obtaining a desired clutch pressure comprises:

the desired torque of the clutch is obtained and according to the formula: and calculating the expected pressure, wherein P is the expected pressure of the clutch, Tq is the expected torque of the clutch, N is the number of friction plates of the clutch, h is a clutch pressure calculation system, and f is the friction coefficient of the friction plates of the clutch.

Technical Field

The invention relates to the technical field of clutch control, in particular to a control method for detecting clamping stagnation of a wet DCT (discrete cosine transformation) electromagnetic valve.

Background

A typical wet DCT (dual clutch automatic transmission) is composed of two clutches that are coaxially nested or arranged in parallel, two input shafts that are coaxially and internally and externally nested, two output shafts that are arranged in parallel, a plurality of synchronizer devices, a plurality of shift forks, and 1 differential, 1 HCU (hydraulic module) that are arranged on the output shafts. The HCU is distributed with electromagnetic valves with different functions, when the gearbox works, the corresponding actuating mechanism is controlled in a hydraulic driving mode by controlling the electromagnetic valves, and the main actuating mechanism comprises a clutch and a synchronizer shifting fork. In order to enable a vehicle to have good driving performance, the speed and the size of the combination of the clutch need to be accurately controlled, the electromagnetic valve is a component for directly controlling the clutch, when the electromagnetic valve is blocked due to impurities (generally aluminum scraps, iron scraps and the like generated in the running process of a gearbox), the electromagnetic valve cannot be accurately controlled according to the expectation of a TCU (gearbox software control unit), so that the actual pressure of the clutch cannot be controlled, the combination speed and the size of the clutch are abnormal, and the problem that the normal driving of the vehicle is affected by flameout, power interruption and the like of the whole vehicle is caused in serious cases. Therefore, how to detect and process the clamping failure of the electromagnetic valve of the wet DCT has important significance.

Disclosure of Invention

The invention provides a control method for detecting the jamming of a wet DCT (discrete cosine transformation) electromagnetic valve, which solves the problem that the existing electromagnetic valve of the warm DCT is easy to cause the control fault of a clutch due to the jamming of impurities, can avoid the pressure abnormity of the clutch due to the jamming of the electromagnetic valve, can cause the fault reporting and the power interruption of a vehicle when the pressure is serious, and can improve the safety of the use of the vehicle.

In order to achieve the above purpose, the invention provides the following technical scheme:

a control method for detecting jamming of a wet DCT electromagnetic valve comprises the following steps:

acquiring the running speed of the vehicle, the actual torque of a clutch and the opening degree of an accelerator pedal so as to identify the running states of the vehicle and a gearbox;

when the running vehicle speed is smaller than a set vehicle speed threshold, the actual torque is smaller than a set torque threshold, and the opening of the accelerator pedal is smaller than a set opening threshold, determining that the current vehicle needs to carry out jamming detection on a clutch pressure control electromagnetic valve;

and acquiring expected pressure and actual pressure of the clutch, judging whether the clutch pressure control solenoid valve is blocked according to the difference value of the expected pressure and the actual pressure, and flushing the solenoid valve with the blockage if the clutch pressure control solenoid valve is blocked.

Preferably, the method further comprises the following steps:

switching the work of the clutch corresponding to the clamping stagnation electromagnetic valve to another clutch which is not clamped stagnation so as to ensure the normal running of the vehicle;

and closing the safety valve of the clutch corresponding to the clamping stagnation electromagnetic valve to release the pressure of the clamping stagnation clutch, so that the clamping stagnation clutch is in a fully opened state.

Preferably, the method further comprises the following steps:

according to the current running state of the vehicle, the shifting fork is used for shifting the non-clamping clutch according to the required gear, so that the non-clamping clutch is filled with oil and combined to keep the normal running of the clutch.

Preferably, the flushing the stuck solenoid valve comprises:

judging whether the actual pressure is smaller than a set pressure threshold value or not to confirm that the clutch corresponding to the clamping stagnation electromagnetic valve is opened;

picking a synchronizer shifting fork on a shaft system corresponding to the clamping stagnation electromagnetic valve to a neutral position, setting the current of the clutch pressure control electromagnetic valve to reach the maximum rated current and continue for a set time, and then setting the current of the clutch pressure control electromagnetic valve to be a set minimum current value and continue for the set time;

and repeatedly setting the current and the duration of the electromagnetic valve, and stopping when the set times are reached.

Preferably, the flushing of the stuck solenoid valve further comprises:

and controlling the current of the electromagnetic valve according to a set pulse square wave by PWM pulse wave to control the pressure of the clutch, so that the current of the clamped electromagnetic valve is alternately changed between 1500mA and 0 according to a set interval, wherein the pulse number of the pulse square wave is equal to the set times.

Preferably, the method further comprises the following steps:

after the washing times reach the set times, judging whether gear shifting is needed or not according to the current running state of the vehicle;

if so, shifting the gear to the clutch with the clamping stagnation again to drive the vehicle normally;

if not, the clutch corresponding to the clamping stagnation electromagnetic valve keeps the state after the washing is finished unchanged until the vehicle state changes and gear shifting switching is required.

Preferably, the determining whether the clutch pressure control solenoid valve is stuck according to the difference between the desired pressure and the actual pressure includes:

and when the difference is greater than a set pressure threshold value and the duration is greater than a set value, determining that the pressure control electromagnetic valve of the clutch is blocked.

Preferably, the acquiring of the desired pressure of the clutch includes:

the desired torque of the clutch is obtained and according to the formula: and calculating the expected pressure, wherein P is the expected pressure of the clutch, Tq is the expected torque of the clutch, N is the number of friction plates of the clutch, h is a clutch pressure calculation system, and f is the friction coefficient of the friction plates of the clutch.

The invention provides a control method for detecting the jamming of a wet DCT electromagnetic valve, which judges whether the clutch pressure control electromagnetic valve is jammed or not according to the running states of a vehicle and a gearbox, and if so, flushes the jammed electromagnetic valve, solves the problem that the existing warm DCT electromagnetic valve is easy to cause clutch control failure due to the jamming of impurities, can avoid the pressure abnormality of the clutch due to the jamming of the electromagnetic valve, and can cause the failure reporting and power interruption of the vehicle when the clutch is serious, and can improve the safety of the use of the vehicle.

Drawings

In order to more clearly describe the specific embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below.

Fig. 1 is a schematic diagram of a method for controlling the sticking detection of a wet DCT solenoid valve according to the present invention.

Fig. 2 is a schematic diagram of a method for processing jamming of a solenoid valve according to an embodiment of the present invention.

Detailed Description

In order to make the technical field of the invention better understand the scheme of the embodiment of the invention, the embodiment of the invention is further described in detail with reference to the drawings and the implementation mode.

The problem of current from accident ware because of the solenoid valve jamming causes control failure is solved. The invention provides a control method for detecting the jamming of a wet DCT electromagnetic valve, which judges whether the clutch pressure control electromagnetic valve is jammed or not according to the running states of a vehicle and a gearbox, and if so, flushes the jammed electromagnetic valve, solves the problem that the existing warm DCT electromagnetic valve is easy to cause clutch control failure due to the jamming of impurities, can avoid the pressure abnormality of the clutch due to the jamming of the electromagnetic valve, and can cause the failure reporting and power interruption of the vehicle when the clutch is serious, and can improve the safety of the use of the vehicle.

As shown in fig. 1, a method for controlling the sticking detection of a wet DCT solenoid valve includes:

s1: and acquiring the running speed of the vehicle, the actual torque of the clutch and the opening degree of an accelerator pedal so as to identify the running states of the vehicle and the gearbox.

S2: and determining that the current vehicle needs to carry out the jamming detection of the clutch pressure control electromagnetic valve when the running vehicle speed is less than a set vehicle speed threshold, the actual torque is less than a set torque threshold and the accelerator pedal opening is less than a set opening threshold.

S3: and acquiring expected pressure and actual pressure of the clutch, judging whether the clutch pressure control solenoid valve is blocked according to the difference value of the expected pressure and the actual pressure, and flushing the solenoid valve with the blockage if the clutch pressure control solenoid valve is blocked.

Specifically, the control process is mainly divided into 3 stages: a judging stage, a processing stage and a recovering stage. The judgment stage aims to identify whether the clutch pressure control electromagnetic valve is blocked or not in the static or low-speed state of the vehicle, and mainly judges according to the relation between the expected pressure and the actual pressure of the clutch. When the difference value between the actual pressure and the expected pressure of the clutch reaches a certain value or the difference value between the actual pressure and the expected pressure of the clutch exceeds a fixed value and the duration time exceeds a fixed value, the jamming of the clutch pressure control electromagnetic valve at the moment is identified. The aim of the processing stage is to flush the stuck clutch and simultaneously switch to work the other clutch so as to ensure that the vehicle can drive normally. The main control process is to process the shafting corresponding to the electromagnetic valve with clamping stagnation and the shafting corresponding to the electromagnetic valve without clamping stagnation. The former is mainly used for flushing, so that the clamping stagnation electromagnetic valve is recovered to be normal; the latter is to keep the vehicle running normally. The recovery stage aims to recover the stuck clutch to a normal state after the flushing of the clutch is finished, and the main control process is that after the flushing of the clutch is finished, the clutch which is flushed is recovered to the clutch which is flushed when the gear shifting is detected to be needed based on the current working state of the vehicle, and all subsequent control is recovered to be normal. According to the method, whether the clutch pressure control electromagnetic valve is blocked or not during normal work is judged in real time according to the relation between the actual pressure and the expected pressure of the clutch, if the electromagnetic valve is identified to be blocked, the electromagnetic valve is washed and switched to another clutch which is not blocked to drive, so that the influence of the blockage of the electromagnetic valve on the driving performance of the whole automobile can be reduced, the problems of unnecessary flameout, failure reporting and power interruption are avoided, and the use safety of the automobile can be improved.

The method further comprises the following steps:

s4: switching the work of the clutch corresponding to the clamping stagnation electromagnetic valve to another clutch which is not clamped stagnation so as to ensure the normal running of the vehicle;

s5: and closing the safety valve of the clutch corresponding to the clamping stagnation electromagnetic valve to release the pressure of the clamping stagnation clutch, so that the clamping stagnation clutch is in a fully opened state.

The method further comprises the following steps:

s6: according to the current running state of the vehicle, the shifting fork is used for shifting the non-clamping clutch according to the required gear, so that the non-clamping clutch is filled with oil and combined to keep the normal running of the clutch.

Further, the flushing the stuck solenoid valve comprises:

and judging whether the actual pressure is smaller than a set pressure threshold value or not so as to confirm that the clutch corresponding to the clamping stagnation electromagnetic valve is opened. And (3) disengaging a synchronizer shifting fork on a shaft system corresponding to the clamping stagnation electromagnetic valve to a neutral position, setting the current of the clutch pressure control electromagnetic valve to reach the maximum rated current and continue for a set time, and then setting the current of the clutch pressure control electromagnetic valve to be the set minimum current value and continue for the set time. And repeatedly setting the current and the duration of the electromagnetic valve, and stopping when the set times are reached.

In practice, as shown in fig. 2, the relief valve in which the stuck clutch occurs is first closed, so that the clutch is fully opened. And then controlling the clutch to be disengaged corresponding to the upper synchronizer shifting fork of the output shaft, opening a clutch safety valve after the disengagement is confirmed, setting the current of the clutch pressure control valve to be minimum and lasting for a certain time, then setting the current of the clutch pressure control valve to be maximum and lasting for a certain time, repeating the current control operation, stopping after reaching the specified times, and taking the setting process of the maximum and minimum current as the washing process of the stuck clutch. When carrying out the jamming clutch and washing, carry out the shift fork according to current whole car state and put in gear to the non-jamming clutch, the clutch oil charge combines, ensures that the vehicle can normally drive, just so can realize not influencing under the condition of vehicle driving function, carries out the jamming clutch and washes.

Further, the flushing of the stuck solenoid valve further comprises: and controlling the current of the electromagnetic valve according to a set pulse square wave by PWM pulse wave to control the pressure of the clutch, so that the current of the clamped electromagnetic valve is alternately changed between 1500mA and 0 according to a set interval, wherein the pulse number of the pulse square wave is equal to the set times.

The method further comprises the following steps:

s7: after the washing times reach the set times, judging whether gear shifting is needed or not according to the current running state of the vehicle; if so, shifting the gear to the clutch with the clamping stagnation again to drive the vehicle normally; if not, the clutch corresponding to the clamping stagnation electromagnetic valve keeps the state after the washing is finished unchanged until the vehicle state changes and gear shifting switching is required.

In one embodiment, the initial state may be a vehicle stationary or running normally, as shown in fig. 2.

The first step is as follows: and identifying the running states of the vehicle and the gearbox, and judging whether the current running state of the vehicle needs to carry out electromagnetic valve clamping stagnation detection. When the vehicle speed is less than a fixed value (reference value 5km/h), the clutch torque is less than a fixed value (reference value 5Nm), and the accelerator pedal opening is less than a fixed value (reference value 10%), the current working state of the vehicle or the gearbox needs to carry out clutch pressure control electromagnetic valve clamping stagnation detection.

The second step is that: and judging whether the clutch pressure control electromagnetic valve is blocked or not. When the absolute value of the difference value between the actual pressure and the expected pressure of the clutch is greater than a fixed value (reference value 150kpa) and the duration time exceeds the fixed value (reference value 500ms), judging that the electromagnetic valve is blocked; or the absolute value of the difference value between the clutch pressure and the expected pressure is larger than the upper limit value (200kpa), and the jamming of the electromagnetic valve is judged.

The third step: and closing the corresponding clutch control safety valve on the shaft system to perform clutch pressure relief.

The fourth step: and judging whether the actual pressure of the clutch is smaller than a fixed value (reference value 60kpa) or not, and confirming that the clutch corresponding to the clamping stagnation electromagnetic valve is opened.

The fifth step: and (4) disengaging a synchronizer shifting fork on the shaft system to a neutral gear.

And a sixth step: according to the current running state of the vehicle, selecting a proper gear on a shafting corresponding to the non-clamping electromagnetic valve to run, and controlling a synchronizer shifting fork of the gear to engage. Wherein the fifth step and the sixth step are performed simultaneously.

The seventh step: setting the current of the clutch pressure control solenoid valve to be maximum (reference value 1500mA) and continuous (200ms), then setting the current of the clutch pressure control solenoid valve to be minimum (reference value 0mA) and continuous (200ms), repeating the current and time setting, stopping (reference time 3) when reaching the set time, wherein the process is to flush the clamping stagnation solenoid valve;

eighth step: the clutch is filled with oil and is combined according to the software request, so that the vehicle is ensured to keep the normal running of the gear; wherein the seventh step and the eighth step are performed simultaneously.

The ninth step: and after the clutch is flushed for a specified number of times, flushing is finished. And at the moment, according to the current running state of the vehicle, when gear shifting is needed, the clutch which is stuck before is switched again through normal gear shifting, so that the vehicle is normally driven. If the gear shifting is not needed according to the current vehicle running state, the clutch which is not clamped is kept to run all the time, and the clamped clutch keeps the state after the washing is finished unchanged until the vehicle state changes and the gear shifting is needed. After shifting, all states are restored to the normal state before jamming.

By the method, the clamping stagnation electromagnetic valve can be restored to be normal by flushing the electromagnetic valve under the condition of not influencing the driving function of the vehicle. The method can simultaneously reduce the influence on the vehicle, such as flameout, power interruption and the like, caused by abnormal pressure of the clutch due to clamping stagnation of the electromagnetic valve.

Further, the determining whether the clutch pressure control solenoid valve is stuck according to the difference between the expected pressure and the actual pressure includes: and when the difference is greater than a set pressure threshold value and the duration is greater than a set value, determining that the pressure control electromagnetic valve of the clutch is blocked.

Still further, the obtaining a desired pressure of the clutch includes: the desired torque of the clutch is obtained and according to the formula: and calculating the expected pressure, wherein P is the expected pressure of the clutch, Tq is the expected torque of the clutch, N is the number of friction plates of the clutch, h is a clutch pressure calculation system, and f is the friction coefficient of the friction plates of the clutch.

The invention provides a control method for detecting the jamming of a wet DCT electromagnetic valve, which judges whether the clutch pressure control electromagnetic valve is jammed or not according to the running states of a vehicle and a gearbox, and if so, flushes the jammed electromagnetic valve, solves the problem that the existing electromagnetic valve of the warm DCT is easy to cause clutch control failure due to the jamming of impurities, can avoid the pressure abnormality of the clutch due to the jamming of the electromagnetic valve, can cause the failure reporting and power interruption of the vehicle when the clutch is serious, and can improve the safety of the use of the vehicle.

The construction, features and functions of the present invention have been described in detail with reference to the embodiments shown in the drawings, but the present invention is not limited to the embodiments shown in the drawings, and all equivalent embodiments modified or modified by the spirit and scope of the present invention should be protected without departing from the spirit of the present invention.