CN110304034B

CN110304034B - Start-up and shift coordination control method for P2 configuration hybrid vehicle starter

Info

Publication number: CN110304034B
Application number: CN201910549057.XA
Authority: CN
Inventors: 宁甲奎; 李翰博; 朱桂庆
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp
Priority date: 2019-06-24
Filing date: 2019-06-24
Publication date: 2020-12-18
Anticipated expiration: 2039-06-24
Also published as: CN110304034A

Abstract

The invention provides a starter start and shift coordination control method for a P2-configuration hybrid vehicle, which comprises a starter start and shift coordination process for shifting in the starter start process and a shift start and shift coordination process for starting the starter in the shift process, so that the starter start process and the shift process can be performed in parallel under any working condition, and mode switching or overlong shift time caused by the fact that the two processes are performed independently is avoided. In addition, by coordinating the starting process and the gear shifting process, the mutual interference of the starting process and the gear shifting process can be avoided on the basis of shortening the mode switching time and the gear shifting time, and the power response and the gear shifting smoothness of the whole vehicle are improved.

Description

Start-up and shift coordination control method for P2 configuration hybrid vehicle starter

Technical Field

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

Background

In order to meet the national fuel consumption limit policy, hybrid power is regarded as one of the effective approaches in recent years, and is regarded and appreciated because the hybrid power has an obvious energy-saving effect and can better meet the requirements of the current market and consumers. The P2 hybrid configuration is that a motor and a separation clutch are added between an engine and a transmission, the engine and the transmission do not need to be changed greatly, and the P2 hybrid configuration has the characteristics of less technical investment, obvious oil saving effect, good dynamic performance and drivability performance and the like, and gradually becomes a main technical solution of the market. Because the mode switching and the gear shifting process are two independent processes and are respectively controlled by a vehicle control unit (HCU) and a Transmission Controller (TCU), if the mode switching and the gear shifting are not well coordinated, the dynamic property or the smoothness of the whole vehicle is necessarily influenced.

Chinese patent document CN 104760590A (the name of the invention: hybrid electric vehicle working mode switching and gear shifting coordination control method based on DCT) provides a hybrid electric vehicle working mode switching and gear shifting coordination control method based on DCT. However, firstly, the method integrates the shift schedule and the mode switching schedule in the same MAP, and the shift schedule and the mode switching schedule are necessarily coupled and interfered with each other, so that the optimization of the dynamic property and the economic property cannot be realized. Secondly, the method can actively reduce the driving torque of the whole vehicle in the mode switching process, and inevitably influences the dynamic property of the whole vehicle in the mode switching and gear shifting processes of the whole vehicle. Thirdly, in the process of power upshift and mode switching, the mode switching and the switching process of the gear shifting clutch are completely overlapped, and the driving smoothness of the whole vehicle is influenced inevitably in the process. Finally, the power motor of the method is in an ISG motor form, the engine has no special starter, and the power motor has different mechanical structure forms and different starting modes.

Therefore, it is desirable to provide a method for coordinated control of operating mode switching and gear shifting of a hybrid electric vehicle without affecting the dynamic performance or smoothness of the whole vehicle.

Disclosure of Invention

Aiming at the technical problems, the invention provides a coordinated control method for starting and gear shifting of a starter of a P2-configuration hybrid vehicle, which can improve the power response and the gear shifting smoothness of the whole vehicle.

The technical scheme adopted by the invention is as follows:

the embodiment of the invention provides a method for coordinated control of starting and gear shifting of a starter of a P2-configuration hybrid vehicle, which comprises a starting and gear shifting coordination process for gear shifting in the starting process of the starter, wherein the starting and gear shifting coordination process comprises the following steps:

controlling the starter to start the engine, and controlling the C0 clutch to fill oil;

after the start is finished, controlling the engine speed to be synchronous with the C1 clutch speed;

when the rotation speed synchronization is finished and the oil filling of the C0 clutch is finished, controlling the engagement of the C0 clutch, namely controlling the torque exchange between the motor and the engine;

in the starting process of the starter, when the gear shifting operation is judged to be needed, after the C0 clutch is judged to be filled with oil, the C2 clutch is controlled to be filled with oil;

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

when the torque exchange of the C1 clutch and the C2 clutch is finished, the engine is coordinated to carry out speed regulation;

and when the speed regulation of the engine is finished, the starting and gear shifting coordination control process is finished.

Further, still include: carrying out a gear shifting starting coordination process of a starter starting in a gear shifting process, wherein the gear shifting starting coordination process comprises the following steps:

executing a gear shifting operation, and controlling the C2 clutch to charge oil;

after the C2 clutch oil filling is completed, controlling the C1 clutch and the C2 clutch to perform torque exchange;

after the torque exchange of the C1 clutch and the C2 clutch is finished, the motor is coordinated to regulate the speed;

in the gear shifting process, when the starter starting operation is judged to be needed, the starter is controlled to start the engine, and whether the C2 clutch is filled with oil is judged;

after the start is finished, controlling the engine speed to be synchronous with the C2 clutch speed;

after the C2 clutch oil filling is judged to be completed, controlling the C0 clutch to fill oil;

after the motor speed regulation is finished, the engine speed regulation is finished and the C0 clutch oil filling is finished, coordinating the engine and the motor to enter a torque exchange process, and simultaneously controlling the engagement of a C0 clutch;

when the engagement of the C0 clutch is completed, the shift start coordination control process ends.

Further, when the rotating speed of the engine is greater than a preset rotating speed value, judging that the starting of the engine is finished;

and when the difference between the engine speed and the clutch speed of the C1 is smaller than the preset speed difference value, judging that the speed synchronization is finished.

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

Further, when the difference between the engine speed and the rotation speed of the C2 clutch is less than the preset rotation speed difference value, the completion of the engine speed regulation is judged.

Further, the preset rotation speed difference value is 30 rpm.

Further, when the difference between the motor speed and the C2 clutch speed is smaller than the preset speed difference value, the motor speed regulation is judged to be finished.

Further, the preset rotation speed difference value is 30 rpm.

Further, when the difference between the actual pressure of the C0 clutch and the pressure of the joint point of the C0 clutch is smaller than a preset pressure threshold value or the oil filling time is longer than a preset time value, the oil filling of the C0 clutch is judged to be finished; and when the difference between the actual pressure of the C2 clutch and the pressure of the joint point of the C2 clutch is smaller than the preset pressure threshold value or the oil filling time is longer than the preset time value, judging that the oil filling of the C2 clutch is finished.

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

The coordinated control method for starting and gear shifting of the starter of the P2-configuration hybrid vehicle provided by the embodiment of the invention at least has the following beneficial effects: the starting process of the starter controlled by the HCU and the gear shifting process controlled by the TCU can be carried out in parallel under any working condition, so that mode switching or overlong gear shifting time caused by the fact that the two processes are carried out independently is avoided; secondly, the starting process and the shifting process are coordinated, wherein the starting process comprises three stages of engine starting, engine speed regulation and C0 clutch engagement, namely motor and engine torque exchange, and the shifting process comprises three stages of C2 clutch oil filling, torque exchange and speed regulation, so that the mutual interference of the starting process and the shifting process can be avoided on the basis of shortening the mode switching time and the shifting time, and the power response and the shifting smoothness of the whole vehicle are improved.

Drawings

FIG. 1 is a schematic structural diagram of a P2 hybrid configuration powertrain as utilized in an embodiment of the present invention;

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

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

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

fig. 5 is a process diagram of the coordination process of the shift start-up machine according to the embodiment of the invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a schematic structural diagram of a hybrid powertrain of the P2 configuration, which is adopted by the embodiment of the invention; FIG. 2 is a schematic diagram illustrating a shift coordination process during the start-up process according to an embodiment of the present invention; FIG. 3 is a process diagram of the start-up shift coordination process according to the embodiment of the present invention; FIG. 4 is a schematic diagram illustrating a start-up coordination process during a gear shifting process according to an embodiment of the present invention; fig. 5 is a process diagram of the coordination process of the shift start-up machine according to the embodiment of the invention.

The control method provided by the embodiment of the invention is carried out based on a P2 hybrid power configuration power assembly. As shown in FIG. 1, the P2 hybrid power train consists of an engine 1, a C0 clutch 2, a power motor 3, a DCT transmission 4 and the like. Wherein, two ends of the C0 clutch 2 are respectively connected with the engine 1 and the power motor 3. The output end of the power motor 3 is connected with the DCT transmission 4, and the output end of the DCT transmission is connected with the transmission shaft 10. The drive torque is transmitted via the C1 clutch 14 (or C2 clutch 13) of the DCT transmission, the odd-numbered shaft 11 (or even-numbered shaft 5), the intermediate shaft 12, the propeller shaft 10, and finally to the wheels 9. The even-number shaft rotation speed sensor 6 and the odd-number shaft rotation speed sensor 7 are used for measuring the rotation speeds of the even-number shaft and the odd-number shaft, respectively, and the output shaft rotation speed sensor 8 is used for measuring the rotation speed of the output shaft.

The starter start and shift coordination control method for a P2 hybrid vehicle according to an embodiment of the present invention will be described with reference to fig. 2 to 5.

According to the coordinated control method for starting and shifting the starter of the P2-configuration hybrid vehicle, provided by the embodiment of the invention, the starting process and the shifting process are coordinated through the mutual cooperation of the TCU, the ECU and the HCU, so that the mutual interference of the starting process and the shifting process can be avoided on the basis of shortening the mode switching and the shifting time, and the power response and the shifting smoothness of the whole vehicle are improved. The starting process comprises three stages of starting the engine, regulating the speed of the engine and engaging a C0 clutch, namely exchanging torque of the motor and the engine. The gear shifting process comprises three stages of C2 clutch oil filling, torque exchange and speed regulation.

As shown in FIG. 2, the method for coordinated starter start and gear shift control of a P2 hybrid vehicle provided by the embodiment of the invention comprises the following steps: the starting gear shifting coordination process for shifting gears in the starting process of the starter comprises the following steps:

The coordination process of the start-up gear shift coordination control process can be as shown in fig. 3, wherein in the phase Q1, the engine is started, the engine is adjusted in speed, and the C0 clutch is filled with oil; in phase Q2, the engine exchanges torque with the electric machine, the C2 clutch is filled with oil; in phase Q3, C1 exchanges clutch torque with C2; in phase Q4, the engine is throttled. In the whole process, the rotating speeds of the C1 clutch and the C2 clutch are not obviously fluctuated, so that the driving performance and the smoothness of the whole vehicle are ensured; the motor torque gradually decreases from the driver required torque to 0 at the phase Q2, the torque of the C0 clutch gradually increases to the driver required torque at the phase Q2, the torque of the C1 clutch gradually decreases from the driver required torque to 0 at the phase Q3, and the torque of the C2 clutch gradually increases to the driver required torque at the phase Q3.

Further, as shown in fig. 4, the starter start and shift coordination control method for a P2 hybrid vehicle according to the embodiment of the present invention further includes: carrying out a gear shifting starting coordination process of a starter starting in a gear shifting process, wherein the gear shifting starting coordination process comprises the following steps:

The coordination process of the shift start coordination control process can be as shown in fig. 5, in phase Q1, C2 clutch is filled with oil; in phase Q2, C1 exchanges torque with the C2 clutch, the C0 clutch fills with oil; in the stage Q3, the motor regulates the speed; in phase Q4, the engine and motor torques are exchanged, and the C0 clutch is engaged. In the whole process, the rotating speeds of the C1 clutch and the C2 clutch are not obviously fluctuated, so that the driving performance and the smoothness of the whole vehicle are ensured; the torque of the C1 clutch is gradually decreased from the driver required torque to 0 at the phase Q2, the torque of the C2 clutch is gradually increased to the driver required torque at the phase Q2, the torque of the motor is gradually decreased from the driver required torque to 0 at the phase Q4, and the torque of the C0 clutch is gradually increased to the driver required torque.

Further, in the starting and gear shifting coordination control process and the gear shifting starting coordination control process, when the rotating speed of the engine is greater than a preset rotating speed value, the engine starting is judged to be finished; the predetermined rotational speed value may be obtained by calibration, and in one example, the predetermined rotational speed value may be 300 rpm.

Further, during the engine starting gear shifting coordination control, when the difference between the engine speed and the C1 clutch speed is smaller than a preset speed difference value, the synchronous completion of the speed is judged. The predetermined speed difference may be obtained by calibration, and in one example, the predetermined speed difference may be 50 rpm.

Further, in the starting gear shifting coordination control process, when the difference between the engine speed and the C2 clutch speed is smaller than a preset speed difference value, the completion of the engine speed regulation is judged. The predetermined speed difference may be obtained by calibration, and in one example, the predetermined speed difference is 30rpm

Further, in the process of coordinated control of gear shifting and starting, when the difference between the rotating speed of the motor and the rotating speed of the C2 clutch is smaller than a preset rotating speed difference value, the motor speed regulation is judged to be finished. The predetermined difference in rotational speed may be obtained by calibration, and in one example, the predetermined difference in rotational speed is 30 rpm.

Further, in the starting and gear-shifting coordination control process and the gear-shifting starting coordination control process, when the difference between the actual pressure of the C0 clutch and the pressure of the joint point of the C0 clutch is smaller than a preset pressure value or the oil filling time is larger than a preset time value, the oil filling of the C0 clutch is judged to be completed; and when the difference between the actual pressure of the C2 clutch and the pressure of the joint point of the C2 clutch is smaller than the preset pressure value or the oil filling time is longer than the preset time value, judging that the oil filling of the C2 clutch is finished. Wherein, the joint point (kissetpoint) pressure of the C0 clutch and the C2 clutch is obtained by self-learning in the driving process, and the preset pressure value and the preset time value are obtained by calibration, in one example, the preset pressure value may be 0.2bar, and the preset time value may be 0.4 s.

[ examples ] A method for producing a compound

The present invention is further described below with reference to fig. 2-5, taking the 1 st gear upshift 2 nd gear process and starter motor restart coincidence as an example.

(1) As shown in fig. 2, the startup shift coordination control process is as follows:

step 101: starting the starting process of the starter;

step 102: the starter starts the engine;

step 103: when the engine speed is greater than a set speed value, such as 300rpm, the HCU judges that the starting of the engine is finished;

step 104: the TCU sends the rotating speed of the C1 clutch to the ECU through the CAN network, and the ECU controls the rotating speed of the engine to be synchronous with the rotating speed of the C1 clutch;

step 105: when the difference between the engine speed and the C1 clutch speed is less than a speed difference set value, such as 50rpm, the ECU determines that speed regulation is complete;

step 106: when the starter starts the engine, the TCU controls the C0 clutch to be filled with 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 of the kisspeint point of the C0 clutch is less than the pressure set value and enters 0.2bar or the oil filling time is more than the time set value and enters 0.4s, the TCU judges that the oil filling of the C0 clutch is finished;

step 108: when the speed regulation of the engine is finished and the oil charging of the C0 clutch is finished, the HCU controls the torque exchange between the motor and the engine, the TCU controls the engagement of the C0 clutch, and when the engagement of the C0 is finished, namely the torque exchange between the motor and the engine is finished, the starting process of the starter is finished;

step 109: in the starting process of the starter, when the TCU judges that 1 liter 2 gear shifting is needed according to the gear shifting MAP, firstly, whether the C0 clutch is filled with oil is judged;

step 110: when the TCU judges that the C0 clutch is completely filled with oil, the TCU controls the C2 clutch to be filled with oil;

step 111: when the C2 clutch fill is complete and the C0 clutch engagement is complete, the TCU controls the C1 clutch and the C2 clutch torque exchange. When the difference between the actual pressure of the C2 clutch detected by the TCU through the pressure sensor and the pressure of the kisspeint point of the C2 clutch is smaller than a pressure set value by 0.2bar or the oil filling time is larger than a time set value by 0.4s, the TCU judges that the oil filling of the C2 clutch is finished;

step 112: the TCU controls the C1 clutch and the C2 clutch to exchange torque;

step 113: after the torque exchange of the C1 clutch and the C2 clutch is finished, the TCU coordinates the speed regulation of the engine;

step 114: when the difference between the engine speed and the C2 clutch speed is less than the set value of 30rpm, the TCU judges that the engine speed regulation is finished, and the gear shifting coordination control is finished in the starting process.

The coordination process of the engine-starting gear-shifting coordination control process may be as shown in fig. 3. (2) Referring to fig. 4, the starter start coordination control process during the 1-gear upshift and 2-gear shift is as follows:

step 201: the 1 liter 2 shift process begins;

step 202: the TCU controls the clutch oil charge of C2;

step 203: when the difference between the actual pressure of the C2 clutch detected by the TCU through the pressure sensor and the pressure of the kisspeint point of the C2 clutch is smaller than a pressure set value by 0.2bar or the oil filling time is larger than a time set value by 0.4s, the TCU judges that the oil filling of the C2 clutch is finished;

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

step 205: after the torque exchange of the C1 clutch and the C2 clutch is finished, the TCU coordinates the speed regulation of the motor;

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

step 207: in the gear shifting process, the HCU judges that a starter starting working condition is entered according to the torque demand of a driver, and sends a starter starting mode to the TCU through a CAN network;

step 208: the starter starts the engine;

step 209: when the rotating speed of the engine is greater than a first speed set value of 300rpm, the HCU judges that the engine is started successfully;

step 210: the TCU sends the rotating speed of the C2 clutch to the ECU through the CAN network, and the ECU controls the rotating speed of the engine to be synchronous with the rotating speed of the C2 clutch;

step 211: when the difference between the engine speed and the C2 clutch speed is less than 50rpm, the TCU judges that the speed regulation is finished;

step 212: in the starting process of the starter, when the TCU firstly judges whether the C2 clutch is filled with oil or not;

step 213: when the TCU judges that the C2 clutch is completely filled with oil, 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 of the kisspeint point of the C0 clutch is smaller than a pressure set value by 0.2bar or the oil filling time is larger than a time set value by 0.4s, the TCU judges that the oil filling of the C0 clutch is finished;

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 a torque exchange process, and simultaneously the TCU controls the engagement of the C0 clutch;

step 216: after the engagement of the C0 clutch is completed, i.e., the exchange of the motor torque and the engine torque is completed, the start coordination control ends during the gear shifting process.

The coordination process of the shift start coordination control process may be as shown in fig. 5. In summary, the coordinated control method for starting and shifting the starter of the hybrid vehicle adopting the P2 configuration provided by the embodiment of the invention has at least the following beneficial effects: the starting process of the starter controlled by the HCU and the gear shifting process controlled by the TCU can be carried out in parallel under any working condition, so that mode switching or overlong gear shifting time caused by the fact that the two processes are carried out independently is avoided; secondly, the starting process and the shifting process are coordinated, wherein the starting process comprises three stages of engine starting, engine speed regulation and C0 clutch engagement, namely motor and engine torque exchange, and the shifting process comprises three stages of C2 clutch oil filling, torque exchange and speed regulation, so that the mutual interference of the starting process and the shifting process can be avoided on the basis of shortening the mode switching time and the shifting time, and the power response and the shifting smoothness of the whole vehicle are improved.

The above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A starter start and shift coordination control method for a P2 configuration hybrid vehicle, characterized by comprising a starter shift coordination process for shifting gears during starter start, the starter shift coordination process comprising:

after the speed regulation of the engine is finished, the starting gear shifting coordination control process is finished;

further comprising: carrying out a gear shifting starting coordination process of a starter starting in a gear shifting process, wherein the gear shifting starting coordination process comprises the following steps:

2. The method according to claim 1, characterized in that it is determined that the engine startup is completed when the engine speed is greater than a preset speed value;

3. The method according to claim 2, characterized in that said preset rotation value is 300 rpm; the preset rotation speed difference value is 50 rpm.

4. The method of claim 1, wherein engine throttling is determined to be complete when the difference between the engine speed and the C2 clutch speed is less than a predetermined speed difference.

5. The method according to claim 4, wherein the predetermined rotational speed difference is 30 rpm.

6. The method of claim 1, wherein motor pacing is determined to be complete when the difference between the motor speed and the C2 clutch speed is less than a predetermined speed difference.

7. The method according to claim 6, wherein the predetermined rotational speed difference is 30 rpm.

8. The method of claim 1, wherein the C0 clutch fill is judged to be complete when the difference between the actual pressure of the C0 clutch and the bond point pressure of the C0 clutch is less than a preset pressure value or the fill time is greater than a preset time value;

and when the difference between the actual pressure of the C2 clutch and the pressure of the joint point of the C2 clutch is smaller than the preset pressure value or the oil filling time is longer than the preset time value, judging that the oil filling of the C2 clutch is finished.

9. The method according to claim 8, characterized in that said preset pressure value is 0.2bar and said preset time value is 0.4 s.