CN110304034A - P2 configuration hybrid vehicle starter cranking and gear shifting coordination control method - Google Patents

Abstract

The present invention provides a P2 configuration hybrid vehicle starter starter and gear shift coordination control method, which includes a starter shift coordination process of shifting gears during the starter startup process and a starter shift coordination process during the shift process. The gear-shifting coordination process of starting can make the starting process and the gear-shifting process of the starter can be carried out in parallel under any working conditions, avoiding the mode switching or the excessively long shifting time caused by the two processes being independently performed. In addition, by coordinating the start-up process and the shift process, on the basis of shortening the mode switching and shifting time, the mutual interference between the start-up process and the shifting process can be avoided, and the dynamic response and shifting smoothness of the vehicle can be improved.

Description

P2 configuration hybrid vehicle starter cranking and gear shifting coordination control method

technical field

The invention relates to a coordinated control method for a P2 configuration hybrid vehicle starter and gear shift, belonging to the field of dual clutch automatic transmission (DCT) control.

Background technique

In order to meet the national fuel consumption limit policy, hybrid power has been regarded as one of the effective ways in recent years, and has been valued and valued because of its obvious energy saving effect and better meeting the current market and consumer needs. The P2 hybrid configuration is to add a motor and a separation clutch between the engine and the transmission. The engine and transmission do not need major changes. It has the characteristics of less technical investment, obvious fuel-saving effect, good power and drivability, and has gradually become the market. mainstream technical solutions. Since the mode switching and gear shifting process are two independent processes, which are controlled by the vehicle controller (HCU) and the transmission controller (TCU) respectively, if the coordination between the two is not good, it will inevitably affect the power or smoothness of the vehicle. .

Chinese patent document CN 104760590A (name of invention: DCT-based hybrid electric vehicle operating mode switching and gear shifting coordinated control method) provides a DCT-based hybrid electric vehicle operating mode switching and gear shifting coordinated control method. However, first of all, this method integrates the shifting law and the mode switching law in the same MAP, and the shifting law and the mode switching law must be coupled and interfered with each other, and the optimization of power performance and economy cannot be achieved. Secondly, this method will actively reduce the vehicle driving torque during the mode switching process, which will inevitably affect the vehicle dynamics during the vehicle mode switching and gear shifting process. Thirdly, in this method, in the process of power upshifting and mode switching, the mode switching and the shifting clutch exchange process are completely coincident, which will inevitably affect the driving smoothness of the whole vehicle. Finally, in this method, the power motor is in the form of an ISG motor, and the engine does not have a dedicated starter. The mechanical structure is different, and the starting method is different.

Therefore, there is an urgent need to provide a coordinated control method for switching the working mode and shifting of the hybrid electric vehicle that does not affect the power or ride comfort of the entire vehicle.

SUMMARY OF THE INVENTION

In view of the above technical problems, the present invention provides a P2 configuration hybrid vehicle starter and gear shift coordinated control method, which can improve the power response and gear shift smoothness of the entire vehicle.

The technical scheme adopted in the present invention is:

An embodiment of the present invention provides a P2 configuration hybrid vehicle starter and gear shift coordination control method, including a starter shift coordination process of performing gear shifting during the starter startup process, and the starter shift coordination process. The process includes:

Control the starter to start the engine, and at the same time, control the C0 clutch to charge oil;

After starting the engine, control the engine speed to synchronize with the C1 clutch speed;

When the speed synchronization is completed and the oil filling of the C0 clutch is completed, controlling the engagement of the C0 clutch means controlling the motor and the engine to exchange torque;

During the starting process of the starter, when it is determined that a shift operation is required, after it is determined that the oil filling of the C0 clutch is completed, the C2 clutch is controlled to be filled with oil;

When the C2 clutch is filled with oil and the C0 clutch is engaged, control the C1 clutch and the C2 clutch to exchange torque;

When the torque exchange between the C1 clutch and the C2 clutch is completed, coordinate the engine for speed regulation;

When the engine speed regulation is completed, the coordinated control process of starting and shifting ends.

Further, it also includes: performing a gear shift and start coordination process for starting the engine during the shift process, and the gear shift start coordination process includes:

Perform shifting operations and control the C2 clutch to charge oil;

After the C2 clutch is filled with oil, control the C1 clutch and the C2 clutch to exchange torque;

After the torque exchange between the C1 clutch and the C2 clutch is completed, coordinate the motor for speed regulation;

During the shifting process, when it is determined that the starter operation needs to be performed, the starter is controlled to start the engine, and it is determined whether the C2 clutch is filled with oil;

After starting the engine, control the engine speed to synchronize with the C2 clutch speed;

After determining that the oil filling of the C2 clutch is completed, control the C2 clutch to carry out oil filling;

After the motor speed regulation is completed, the engine speed regulation is completed and the C0 clutch is filled with oil, the engine and the motor are coordinated to enter the torque exchange process, and the C0 clutch is controlled at the same time;

When the engagement of the C0 clutch is completed, the coordinated start-shift control process ends.

Further, when the engine speed is greater than the preset speed value, it is determined that the engine startup is completed;

When the difference between the engine speed and the C1 clutch speed is less than the preset speed difference, it is determined that the speed synchronization is completed.

Further, the preset rotational speed value is 300 rpm; the preset rotational speed difference value is 50 rpm.

Further, when the difference between the engine speed and the C2 clutch speed is less than a preset speed difference, it is determined that the engine speed regulation is completed.

Further, the preset rotational speed difference is 30 rpm.

Further, when the difference between the rotational speed of the motor and the rotational speed of the C2 clutch is less than a preset rotational speed difference, it is determined that the motor speed regulation is completed.

Further, the preset rotational speed difference is 30 rpm.

Further, when the difference between the actual pressure of the C0 clutch and the pressure at the joint point of the C0 clutch is less than the preset pressure threshold or the oil filling time is greater than the preset time value, it is judged that the C0 clutch is filled with oil; when the actual pressure of the C2 clutch is completed. When the pressure difference with the connection point of the C2 clutch is less than the preset pressure threshold or the oil filling time is greater than the preset time value, it is determined that the C2 clutch is filled with oil.

Further, the preset pressure value is 0.2 bar, and the preset time value is 0.4s.

The P2 configuration hybrid vehicle starter and gear shift coordinated control method provided by the embodiment of the present invention has at least the following beneficial effects: the HCU-controlled starter start-up process and the TCU-controlled gear shift process can be under any working conditions. It is carried out in parallel to avoid the mode switching or the long shift time caused by the two processes being carried out independently of each other; secondly, by coordinating the start-up process and the shift process, the start-up process includes engine start, engine speed regulation, and C0 clutch engagement. That is, there are three stages of torque exchange between the motor and the engine. The shifting process includes three stages of C2 clutch oil filling, torque exchange, and speed regulation. On the basis of shortening the mode switching and shifting time, the starting process and shifting process can be avoided. Interfere with each other to improve the vehicle's dynamic response and shift smoothness.

Description of drawings

1 is a schematic structural diagram of a P2 hybrid configuration powertrain adopted in an embodiment of the present invention;

FIG. 2 is a schematic diagram of a shift coordination process during a start-up process according to an embodiment of the present invention;

3 is a process diagram of a start-up shift coordination process according to an embodiment of the present invention;

4 is a schematic diagram of a start-up coordination process during a gear shift process according to an embodiment of the present invention;

FIG. 5 is a process diagram of a shift-start coordination process according to an embodiment of the present invention.

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, the following will be described in detail with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a schematic structural diagram of a P2 configuration hybrid powertrain adopted in an embodiment of the present invention; FIG. 2 is a schematic diagram of a shift coordination process during a start-up process according to an embodiment of the present invention; FIG. 3 is a start-up gear shift according to an embodiment of the present invention. Coordination processing process diagram; FIG. 4 is a schematic diagram of a start coordination process during a shift process according to an embodiment of the present invention; FIG. 5 is a shift start coordination processing process diagram according to an embodiment of the present invention.

The control method provided by the embodiment of the present invention is performed based on the P2 hybrid configuration powertrain. As shown in FIG. 1 , the P2 hybrid configuration powertrain is composed of an engine 1, a C0 clutch 2, a power motor 3, a DCT transmission 4, and the like. Among them, the two ends of the C0 clutch 2 are respectively connected to the engine 1 and the power motor 3. The output end of the power motor 3 is connected to the DCT transmission 4, and the output end of the DCT transmission is connected to the transmission shaft 10. The driving torque is finally transmitted to the wheels 9 through the C1 clutch 14 (or the C2 clutch 13 ), the odd-numbered shaft 11 (or the even-numbered shaft 5 ), the intermediate shaft 12 , and the propeller shaft 10 of the DCT transmission. The even-numbered shaft rotational speed sensor 6 and the odd-numbered shaft rotational speed sensor 7 are respectively used to measure the rotational speed of the even-numbered and odd-numbered shafts, and the output shaft rotational speed sensor 8 is used to measure the rotational speed of the output shaft.

Hereinafter, with reference to FIGS. 2 to 5 , the P2 configuration hybrid vehicle start-up and shift coordination control method provided by the embodiment of the present invention will be described.

The P2 configuration hybrid vehicle starter and gear shift coordination control method provided by the embodiment of the present invention coordinates the start-up process and the gear-shift process through the cooperation of the TCU, the ECU and the HCU, which can shorten the mode switching and gear-shifting time. On this basis, the mutual interference between the starting process and the shifting process is avoided, and the dynamic response and shifting smoothness of the whole vehicle are improved. Among them, the starting process includes three stages: engine starting, engine speed regulation, C0 clutch engagement, that is, motor and engine torque exchange. The shifting process includes three stages of C2 clutch oil filling, torque exchange and speed regulation.

As shown in FIG. 2 , the P2 configuration hybrid electric vehicle start-up and gear-shift coordination control method provided by the embodiment of the present invention includes: a start-up shift coordination process of performing gear shifting during the start-up process, the The start-up shift coordination process includes:

Control the starter to start the engine, and at the same time, control the C0 clutch to charge oil;

After starting the engine, control the engine speed to synchronize with the C1 clutch speed;

When the speed synchronization is completed and the oil filling of the C0 clutch is completed, controlling the engagement of the C0 clutch means controlling the motor and the engine to exchange torque;

During the starting process of the starter, when it is determined that a shift operation is required, after it is determined that the oil filling of the C0 clutch is completed, the C2 clutch is controlled to be filled with oil;

When the C2 clutch is filled with oil and the C0 clutch is engaged, control the C1 clutch and the C2 clutch to exchange torque;

When the torque exchange between the C1 clutch and the C2 clutch is completed, coordinate the engine for speed regulation;

When the engine speed regulation is completed, the coordinated control process of starting and shifting ends.

The coordinated processing process of the coordinated control process of starting and shifting can be shown in Figure 3. In the Q1 stage, the engine is started, the engine speed is adjusted, and the C0 clutch is filled with oil; in the Q2 stage, the torque between the engine and the motor is exchanged, and the C2 clutch is charged. Oil; in the Q3 stage, the C1 and C2 clutch torques are exchanged; in the Q4 stage, the engine is regulated. In the whole process, it can be seen that the rotational speed of the C1 clutch and C2 clutch has no obvious fluctuation, which ensures the drivability and smoothness of the whole vehicle; the motor torque is gradually reduced from the driver's torque demand to 0 in the Q2 stage, and the torque of the C0 clutch is at The Q2 stage gradually increases to the driver demand torque, the C1 clutch torque gradually decreases from the driver demand torque to 0 in the Q3 stage, and the C2 clutch torque gradually rises to the driver demand torque in the Q3 stage.

Further, as shown in FIG. 4 , the P2 configuration hybrid electric vehicle starter and gear shift coordination control method provided by the embodiment of the present invention further includes: performing the shift start coordination of the starter during the shifting process process, the gear shift start coordination process includes:

Perform shifting operations and control the C2 clutch to charge oil;

After the C2 clutch is filled with oil, control the C1 clutch and the C2 clutch to exchange torque;

After the torque exchange between the C1 clutch and the C2 clutch is completed, coordinate the motor for speed regulation;

During the shifting process, when it is determined that the starter operation needs to be performed, the starter is controlled to start the engine, and it is determined whether the C2 clutch is filled with oil;

After starting the engine, control the engine speed to synchronize with the C2 clutch speed;

After determining that the oil filling of the C2 clutch is completed, control the C2 clutch to carry out oil filling;

After the motor speed regulation is completed, the engine speed regulation is completed and the C0 clutch is filled with oil, the engine and the motor are coordinated to enter the torque exchange process, and the C0 clutch is controlled at the same time;

When the engagement of the C0 clutch is completed, the coordinated start-shift control process ends.

The coordinated processing process of the coordinated control process of shift start can be shown in Figure 5. In the Q1 stage, the C2 clutch is filled with oil; in the Q2 stage, the torque of the C1 and C2 clutches is exchanged, and the C0 clutch is filled with oil; in the Q3 stage, the motor speed is adjusted ; In the Q4 stage, the engine and motor torques are exchanged and the C0 clutch is engaged. In the whole process, it can be seen that the rotational speed of the C1 clutch and C2 clutch has no obvious fluctuation, which ensures the drivability and smoothness of the whole vehicle; the torque of the C1 clutch gradually decreases from the driver's demand torque to 0 in the Q2 stage, and the torque of the C2 clutch In the Q2 stage, it gradually rises to the driver's demand torque, and the motor torque gradually decreases from the driver's demand torque to 0 in the Q4 stage, and the torque of the C0 clutch gradually rises to the driver's demand torque.

Further, in the coordinated control process of starting and shifting and the coordinated control of shifting and starting, when the engine speed is greater than the preset speed value, it is determined that the engine start is completed; the preset speed value can be obtained by calibration, In an example, the preset rotational speed value may be 300 rpm.

Further, in the coordinated control process of starting and shifting, when the difference between the engine speed and the C1 clutch speed is less than a preset speed difference, it is determined that the speed synchronization is completed. The preset rotational speed difference may be obtained through calibration. In an example, the preset rotational speed difference may be 50 rpm.

Further, in the coordinated control process of starting and shifting, when the difference between the rotational speed of the engine and the rotational speed of the C2 clutch is less than a preset rotational speed difference, it is determined that the engine speed regulation is completed. The preset rotational speed difference can be obtained by calibration. In an example, the preset rotational speed difference is 30 rpm

Further, in the coordinated control process of shifting and starting, when the difference between the rotational speed of the motor and the rotational speed of the C2 clutch is less than a preset rotational speed difference, it is determined that the motor speed regulation is completed. The preset rotational speed difference can be obtained through calibration. In an example, the preset rotational speed difference is 30 rpm.

Further, in the coordinated control process of starting and shifting and the coordinated control of shifting and starting, when the difference between the actual pressure of the C0 clutch and the pressure at the connection point of the C0 clutch is less than the preset pressure value or the oil filling time is greater than the preset value. When the time value is set, it is judged that the oil filling of the C0 clutch is completed; when the difference between the actual pressure of the C2 clutch and the pressure at the joint point of the C2 clutch is less than the preset pressure value or the oil filling time is greater than the preset time value, it is judged that the C2 The clutch filling is complete. The kisspoint pressure of the C0 clutch and the C2 clutch is obtained by self-learning during driving, and the preset pressure value and the preset time value are obtained through calibration. In one example, the preset pressure value may be 0.2 bar, the preset time value can be 0.4s.

【Example】

Hereinafter, with reference to FIGS. 2 to 5 , the present invention will be further described by taking the process of 1st gear up to 2nd gear and the coincidence of the starter as an example.

(1) As shown in Figure 2, the coordinated control process of starting and shifting is as follows:

Step 101: the start-up process starts;

Step 102: the starter starts the engine;

Step 103: When the engine speed is greater than the speed setting value, such as 300rpm, the HCU determines that the engine start-up is completed;

Step 104: The TCU sends the speed of the C1 clutch to the ECU through the CAN network, and the ECU controls the engine speed to synchronize with the speed of the C1 clutch;

Step 105: When the difference between the engine speed and the C1 clutch speed is less than the set value of the speed difference, such as 50 rpm, the ECU determines that the speed regulation is completed;

Step 106: while the starter starts the engine, the TCU controls the C0 clutch to charge oil;

Step 107: When the difference between the actual pressure of the C0 clutch detected by the TCU through the pressure sensor and the pressure at the kisspoint point of the C0 clutch is less than the pressure setting value by 0.2bar or the oil filling time is greater than the time setting value by 0.4s, the TCU determines that the C0 clutch is charged. oil finish;

Step 108: When the engine speed regulation is completed and the C0 clutch is filled with oil, the HCU controls the motor and the engine to perform torque exchange, and the TCU controls the C0 clutch to engage. When the C0 engagement is completed, that is, after the motor torque and engine torque exchange is completed, the starter starts the process. Finish;

Step 109: During the start-up process of the starter, when the TCU determines that it is necessary to perform a 1-liter-2 shift according to the shift MAP, it first determines whether the C0 clutch is filled with oil;

Step 110: When the TCU determines that the oil filling of the C0 clutch is completed, the TCU controls the C2 clutch to be filled with oil;

Step 111: After the C2 clutch is charged with oil and the C0 clutch is engaged, the TCU controls the torque exchange between the C1 clutch and the C2 clutch. When the difference between the actual pressure of the C2 clutch detected by the TCU through the pressure sensor and the pressure at the kisspoint point of the C2 clutch is less than the pressure setting value of 0.2bar or the oil filling time is greater than the time setting value of 0.4s, the TCU determines that the C2 clutch is filled with oil;

Step 112: The TCU controls the C1 clutch and the C2 clutch to perform torque exchange;

Step 113: After the torque exchange between the C1 clutch and the C2 clutch is completed, the TCU coordinates the engine speed regulation;

Step 114: When the difference between the engine speed and the C2 clutch speed is less than the set value of 30 rpm, the TCU determines that the engine speed regulation is completed, and the gear shift coordination control ends during the start-up process.

The coordinated processing process of the start-up shift coordinated control process can be shown in FIG. 3 . (2) Referring to Figure 4, the coordinated control process of starting the engine during the shifting process of shifting from 1st gear to 2nd gear is as follows:

Step 201: 1 liter 2 shifting process starts;

Step 202: TCU controls the C2 clutch to charge oil;

Step 203: When the difference between the actual pressure of the C2 clutch detected by the TCU through the pressure sensor and the pressure at the kisspoint point of the C2 clutch is less than the pressure setting value of 0.2bar or the oil filling time is greater than the time setting value of 0.4s, the TCU determines that the oil filling of the C2 clutch is completed. ;

Step 204: the TCU controls the C1 clutch and the C2 clutch to perform torque exchange;

Step 205: After the torque exchange between the C1 clutch and the C2 clutch is completed, the TCU coordinates the motor speed regulation;

Step 206: when the difference between the motor speed and the C2 clutch speed is less than the set value of 30rpm, the TCU determines that the motor speed regulation is completed;

Step 207: During the gear shifting process, the HCU determines to enter the starter startup condition according to the driver's torque demand, and sends the starter startup mode to the TCU through the CAN network;

Step 208: the starter starts the engine;

Step 209: When the engine speed is greater than the first speed setting value of 300rpm, the HCU determines that the engine is successfully started;

Step 210: The TCU sends the speed of the C2 clutch to the ECU through the CAN network, and the ECU controls the engine speed to synchronize with the speed of the C2 clutch;

Step 211: When the difference between the engine speed and the C2 clutch speed is less than the speed difference set value of 50rpm, the TCU determines that the speed regulation is completed;

Step 212: During the start-up process of the starter, when the TCU first determines whether the C2 clutch is filled with oil;

Step 213: When the TCU determines that the oil filling of the C2 clutch is completed, the TCU controls the C0 clutch to be filled with oil;

Step 214: When the difference between the actual pressure of the C0 clutch detected by the TCU through the pressure sensor and the pressure at the kisspoint point of the C0 clutch is less than the pressure setting value of 0.2bar or the oil filling time is greater than the time setting value of 0.4s, the TCU determines that the oil filling of the C0 clutch is completed. ;

Step 215: When the HCU receives the motor speed regulation completion flag, the C0 oil filling completion flag and the engine speed regulation completion flag sent by the ECU through the CAN network, the HCU coordinates the engine and the motor to enter the torque exchange process, and the TCU controls the C0 clutch to engage. ;

Step 216 : when the C0 clutch is engaged, that is, when the motor torque and the engine torque are exchanged, the start-up coordination control during the shifting process ends.

The coordinated processing process of the shift start coordinated control process can be shown in FIG. 5 . To sum up, the coordinated control method for starting the starter and shifting of the hybrid electric vehicle using the P2 configuration provided by the embodiment of the present invention has at least the following beneficial effects: the starter start process controlled by the HCU and the shift process controlled by the TCU can be Parallel operation under any working condition avoids the mode switching or gear shifting time caused by the two processes being independently performed. 、C0 clutch engagement is three stages of motor and engine torque exchange. The shifting process includes three stages of C2 clutch oil filling, torque exchange, and speed regulation process, which can avoid the start-up process on the basis of shortening the mode switching and shifting time. It interferes with the shifting process and improves the dynamic response and shifting smoothness of the vehicle.

The above-mentioned embodiments are only specific implementations of the present invention, and are used to illustrate the technical solutions of the present invention, but not to limit them. Detailed description, those of ordinary skill in the art should understand: any person skilled in the art is within the technical scope disclosed by the present invention, and it can still modify the technical solutions described in the foregoing embodiments or can easily think of changes, Or equivalently replace some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. a kind of P2 configuration hybrid vehicle starter motor opens machine and shift control method for coordinating, which is characterized in that be included in and open Motivation open shift gears during machine open machine shift coordination process, the machine shift coordination process that opens includes:

It controls starter motor and starts engine, meanwhile, control C0 clutch is oil-filled；

After the completion of opening machine, control engine speed is synchronous with C1 clutch rotational speed；

It is synchronously completed in revolving speed and when the oil-filled completion of C0 clutch, the i.e. control motor and engine of control C0 clutch engagement carries out Torque exchange；

During starter motor opens machine, when judgement needs to carry out gear shift operation, after the completion of determining that C0 clutch is oil-filled, C2 is controlled Clutch carries out oil-filled；

After the completion of the oil-filled completion of C2 clutch and the engagement of C0 clutch, controls C1 clutch and C2 clutch carries out torque friendship It changes；

After the completion of C1 clutch and the exchange of C2 clutch moment of torque, coordinates engine and adjusted the speed；

After the completion of engine governed speed, the machine shift coordinated control process that opens terminates.

2. according to the method described in claim 1, further include: machine coordination is opened in the shift that progress starter motor opens machine in shift process Process, the shift open machine coordination process and include:

Gear shift operation is executed, and it is oil-filled to control the progress of C2 clutch；

After the completion of C2 clutch is oil-filled, controls C1 clutch and C2 clutch carries out torque exchange；

After the completion of C1 clutch and C2 clutch moment of torque exchange, coordinates motor and adjusted the speed；

In shift process, judgement need to be implemented starter motor open machine operation when, control starter motor start engine, and determine C2 from The whether oil-filled completion of clutch；

After the completion of opening machine, control engine speed is synchronous with C2 clutch rotational speed；

After the completion of determining that C2 clutch is oil-filled, control C2 clutch carries out oil-filled；

After the completion of electric machine speed regulation is completed, engine governed speed is completed and C0 clutch is oil-filled, coordinates engine and motor enters Torque exchange process, while controlling the engagement of C0 clutch；

After the completion of the engagement of C0 clutch, machine coordinated control process is opened in the shift to be terminated.

3. method according to claim 1 or 2, which is characterized in that when engine speed is greater than preset tachometer value, sentence Determine engine and opens machine completion；

When engine speed and C1 clutch rotational speed difference are less than preset rotating speed difference, determine that revolving speed synchronously completes.

4. according to the method described in claim 3, it is characterized in that, the preset tachometer value is 300rpm；It is described preset Rotating speed difference is 50rpm.

5. method according to claim 1 or 2, which is characterized in that when engine speed and C2 clutch rotational speed difference are less than When preset rotating speed difference, determine that engine governed speed is completed.

6. according to the method described in claim 5, it is characterized in that, the preset rotating speed difference is 30rpm.

7. according to the method described in claim 2, it is characterized in that, working as motor speed with C2 clutch rotational speed difference less than preset When rotating speed difference, determine that electric machine speed regulation is completed.

8. the method according to the description of claim 7 is characterized in that the preset rotating speed difference is 30rpm.

9. method according to claim 1 or 2, which is characterized in that when actual pressure and the C0 clutch of C0 clutch When being less than preset pressure value or oil-filled time in conjunction with the difference of point pressure and be greater than preset time value, judge that C0 clutch is oil-filled It completes；

When the difference of the combination point pressure of the actual pressure and C2 clutch of C2 clutch is less than the preset pressure value or fills When the oily time is greater than the preset time value, the oil-filled completion of C2 clutch is judged.

10. according to the method described in claim 9, it is characterized in that, the preset pressure value be 0.2bar, it is described preset Time value is 0.4s.