CN113753044B - Control method and device for starting engine of hybrid electric vehicle - Google Patents

Control method and device for starting engine of hybrid electric vehicle Download PDF

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Publication number
CN113753044B
CN113753044B CN202010490066.9A CN202010490066A CN113753044B CN 113753044 B CN113753044 B CN 113753044B CN 202010490066 A CN202010490066 A CN 202010490066A CN 113753044 B CN113753044 B CN 113753044B
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China
Prior art keywords
clutch
engine
gear shifting
rotating speed
oil pressure
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CN202010490066.9A
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Chinese (zh)
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CN113753044A (en
Inventor
刘方
李欢
付文晖
孙成伟
吴蒙
江建山
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Guangzhou Automobile Group Co Ltd
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Guangzhou Automobile Group Co Ltd
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Priority to CN202010490066.9A priority Critical patent/CN113753044B/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/18—Propelling the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/02—Conjoint control of vehicle sub-units of different type or different function including control of driveline clutches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/02—Clutches
    • B60W2710/021—Clutch engagement state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/06—Combustion engines, Gas turbines
    • B60W2710/0644—Engine speed

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Hybrid Electric Vehicles (AREA)
  • Control Of Transmission Device (AREA)

Abstract

The application relates to a power system and a control method and a device for starting an engine of a hybrid electric vehicle, wherein the control method for starting the engine of the hybrid electric vehicle comprises the following steps: switching the gear shifting clutch to a slipping state and maintaining the gear shifting clutch; controlling the engine to start after ignition when the main clutch is at a half-engagement point during the period that the gear shifting clutch is kept in a slipping state, and locking the main clutch; and adjusting the rotation speed of the driving end of the gear shifting clutch to be synchronous with the wheel end and locking the gear shifting clutch. The application starts the engine when the main clutch is at the half-joint point, reduces shafting torque shake in the process of starting the engine to the greatest extent, and effectively isolates shake through sliding friction control of the gear shifting clutch, thereby improving smoothness of output torque of the hybrid system and ensuring good drivability when the vehicle mode is switched.

Description

Control method and device for starting engine of hybrid electric vehicle
Technical Field
The application relates to the technical field of hybrid electric vehicles, in particular to a control method and a device for starting an engine of a hybrid electric vehicle.
Background
The power system of the hybrid electric vehicle comprises a main clutch and a gear shifting clutch, wherein the engine is connected with the motor through the main clutch, the motor is connected with the output shaft of the power system through the gear shifting clutch, and the hybrid electric vehicle can be driven by the engine or the motor independently or can be driven by the engine and the motor together. An important problem in powertrain control for hybrid vehicles is the switching process control between a purely electric mode, in which the engine is not operating, and a hybrid mode, in which the engine is engaged, i.e., the hybrid system starts the engine process control.
The engine starting process is easy to shake, on one hand, the starting rotating speed is obviously lower than the normal working rotating speed, the stability of the air inlet process is poor, the combustion environments such as the temperature in a cylinder, the air flow and the like are poor, so that the stability of the engine starting process is poor compared with the normal working process, and the torque and the rotating speed have large fluctuation; on the other hand, the engine is subjected to a rapid rotation speed change process from static to dynamic and from low rotation speed to high rotation speed in the process of being towed, and the friction torque of the engine and the rotation speed of the engine are in nonlinear change, so that the rapid nonlinear change of the friction torque can cause that the external part is difficult to give an accurate towing torque to just overcome the friction torque of the engine, and the engine is injected to ignite and then introduces a starting torque which is rapidly changed (unsteady working) per se, so that the fluctuation of shafting torque and rotation speed is easier to generate in the whole process. In the process of starting an engine, the engine and the wheel end are completely separated by the clutch in a static state, so that the torque smoothness of the wheel end cannot be influenced by starting the engine, and the torque smoothness problem of the engine in driving needs to be overcome because the hybrid power vehicle needs to be switched from a pure electric mode to a hybrid mode in driving.
Disclosure of Invention
Aiming at the technical problems, the application provides a control method and a control device for starting an engine of a hybrid electric vehicle, which can improve the smoothness of the output torque of a hybrid system and ensure good drivability when the vehicle mode is switched.
In order to solve the above technical problems, the present application provides a control method for starting an engine of a hybrid electric vehicle, wherein a power system of the hybrid electric vehicle includes an engine, a motor, a main clutch, a shift clutch and an output shaft, the engine and the motor are connected by the main clutch, the motor and the output shaft are connected by the shift clutch, the control method includes:
The oil pressure of the gear shifting clutch is downwards regulated according to the sliding friction point of the gear shifting clutch until the rotating speed of the gear shifting clutch connected with the driving end of the motor is increased to a first rotating speed;
maintaining the oil pressure of the gear shifting clutch, and regulating the speed of the motor to increase the first rotating speed to the second rotating speed so as to maintain the gear shifting clutch in a slipping state;
Controlling the engine to lock the main clutch after ignition start when the main clutch is at a half-engagement point during the period that the gear shifting clutch is kept in a slipping state;
and adjusting the rotation speed of the driving end of the gear shifting clutch to be synchronous with the wheel end and locking the gear shifting clutch.
The step of adjusting the oil pressure of the shift clutch downwards according to the sliding point of the shift clutch until the rotation speed of the drive end of the shift clutch connecting motor rises to a first rotation speed comprises the following steps:
adjusting the oil pressure of the gear shifting clutch to a sliding friction point;
And continuously regulating the oil pressure at the first preset speed at the sliding point until the rotating speed of the driving end of the gear shifting clutch is increased to the first rotating speed.
Wherein the method further comprises:
And in the process of switching the gear shifting clutch to the slipping state, the oil pressure of the main clutch is increased to the half-engagement point.
Wherein said controlling the engine after ignition start with the main clutch at the half-engagement point locks the main clutch during said shift clutch maintaining the slip state, comprises:
When the rotation speed of the driving end of the gear shifting clutch reaches a third rotation speed, the oil pressure of the main clutch is lifted from the half-combining point to pull up the rotation speed of the engine, and the third rotation speed is larger than the first rotation speed and smaller than or equal to the second rotation speed;
Adjusting the oil pressure of the main clutch to the half-engagement point after the engine reaches an ignition speed;
controlling the ignition and starting of the engine, and performing closed-loop torque control on the engine according to the target rotating speed corresponding to the third rotating speed;
And locking the main clutch after the rotating speed of the engine is increased to the target rotating speed.
Wherein said lifting the oil pressure of the main clutch from the half engagement point to pull up the rotational speed of the engine comprises:
lifting the oil pressure of the main clutch from the half-junction point through an open-loop calibration feedforward oil pressure reference curve, and lifting the rotating speed of the engine to the ignition rotating speed;
The engine ignition is inhibited until the oil pressure of the main clutch is adjusted down to the half-engagement point.
Wherein said locking said main clutch comprises:
lifting the oil pressure of the main clutch;
And when the speed difference of the main clutch is smaller than or equal to a set threshold value, the oil pressure of the main clutch is increased according to a second preset slope so as to lock the main clutch.
Wherein, adjust the initiative end rotational speed and the wheel end synchronization of gear shifting clutch and lock gear shifting clutch, include:
the motor is subjected to speed regulation, so that the rotating speed of the driving end of the gear shifting clutch is reduced from the second rotating speed to a fourth rotating speed synchronous with the wheel end;
and when the rotating speed of the driving end of the shifting clutch is reduced to a fifth rotating speed, the oil pressure of the shifting clutch is increased to lock the shifting clutch, and the fifth rotating speed is smaller than the fourth rotating speed.
Wherein after the adjusting the rotation speed of the drive end of the gear shifting clutch and the wheel end are synchronous and the gear shifting clutch is locked, the method comprises the following steps:
Stopping speed regulation and torque control of the motor, and responding to torque distribution of the next steady-state mode.
The application also provides a control device for starting an engine of a hybrid electric vehicle, which comprises a memory and a processor, wherein the memory is used for storing at least one program instruction, and the processor is used for realizing the control method for starting the engine of the hybrid electric vehicle by loading and executing the at least one program instruction.
As described above, the control method and apparatus for starting an engine of a hybrid vehicle according to the present application include: and switching the gear shifting clutch to a slipping state and keeping the gear shifting clutch, controlling the engine to lock the main clutch after ignition and starting when the main clutch is at a half-engagement point during the period that the gear shifting clutch keeps the slipping state, adjusting the rotating speed of the driving end of the gear shifting clutch to be synchronous with the wheel end and locking the gear shifting clutch. The application starts the engine when the main clutch is at the half-joint point, so that shafting torque shake in the process of starting the engine is reduced to the greatest extent, and shake is effectively isolated through sliding friction control of the gear shifting clutch, thereby ensuring smoothness of output torque of the hybrid system and ensuring good drivability when the vehicle mode is switched.
Drawings
Fig. 1 is a flowchart showing a control method of starting an engine of a hybrid vehicle according to a first embodiment;
fig. 2 is a schematic structural view of a power system of a hybrid vehicle according to the first embodiment;
Fig. 3 is a schematic structural view of a control system of the hybrid vehicle according to the first embodiment;
FIG. 4 is a timing diagram of key parameters for starting an engine according to the first embodiment;
fig. 5 is a schematic structural view of a control device for starting an engine of a hybrid vehicle according to a second embodiment.
Detailed Description
Further advantages and effects of the present application will become apparent to those skilled in the art from the disclosure of the present application, which is described by the following specific examples.
In the following description, reference is made to the accompanying drawings which describe several embodiments of the application. It is to be understood that other embodiments may be utilized and that mechanical, structural, electrical, and operational changes may be made without departing from the spirit and scope of the present application. The following detailed description is not to be taken in a limiting sense, and the scope of embodiments of the present application is defined only by the claims of the issued patent. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
Although the terms first, second, etc. may be used herein to describe various elements in some examples, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element.
Furthermore, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes," and/or "including" specify the presence of stated features, steps, operations, elements, components, items, categories, and/or groups, but do not preclude the presence, presence or addition of one or more other features, steps, operations, elements, components, items, categories, and/or groups. The terms "or" and/or "as used herein are to be construed as inclusive, or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a, A is as follows; b, a step of preparing a composite material; c, performing operation; a and B; a and C; b and C; A. b and C). An exception to this definition will occur only when a combination of elements, functions, steps or operations are in some way inherently mutually exclusive.
First embodiment
Fig. 1 is a flowchart showing a control method of starting an engine of a hybrid vehicle according to a first embodiment. Referring to fig. 1, a control method for starting an engine of a hybrid vehicle according to the present embodiment includes:
Step 110, switching the gear shifting clutch to a slipping state and maintaining the same;
Step 120, controlling the engine to lock up the main clutch after ignition start when the main clutch is at the half-engagement point during the period when the shift clutch is kept in the slipping state;
Step 130, adjusting the drive end rotational speed of the shift clutch to synchronize with the wheel end and locking the shift clutch.
Referring to fig. 2, a power system of a hybrid vehicle is provided with an engine 21, a motor 22, a main clutch 23, and a shift clutch 24, wherein the engine 21 and the motor 22 are connected by the main clutch 23, the motor 22 and an output shaft 25 of the power system are connected by the shift clutch 24, and the hybrid vehicle can be driven by the engine 21 or the motor 22 alone or by the engine 21 and the motor 22 together. Specifically, a ring gear 27 (ring gear) of a planetary gear is connected to one end of a main clutch 23 and to a motor 22, the other end of the main clutch 23 is connected to an engine 21, a sun gear 26 (sun gear) of the planetary gear is connected to a drive end of a shift clutch 24, and a rotational speed of the drive end of the shift clutch 24, that is, a rotational speed of the sun gear 26, is connected to an output shaft 25 of a power system by the planetary gear 28 connected to a carrier (PLANET CARRIER), and the ring gear 27 and the sun gear 26 are engaged with planetary gears 28 (PLANET GEAR), respectively.
When the shift clutch 24 is in the slipping state, the sun gear 26 rotates at a fixed rotational speed, and the output of the output shaft 25 of the power system can be kept in a relatively stable state, thereby effectively isolating the hunting at the start of the engine 21. Meanwhile, during the period in which the shift clutch 24 is kept in the slipping state, the engine 21 is controlled to start with the main clutch 23 at a half-engagement Point (KP), and shafting torque jitter during starting of the engine 21 can be minimized.
Referring to fig. 3, the rotational speed signal of the motor 22 and the rotational speed signal of the engine 21 are sent to a hybrid system controller 31 (VCU) through a motor controller 32 (MCU) and an engine controller 33 (EMS), respectively, the oil pressure signals of the main clutch 23 and the shift clutch 24 are collected through a main clutch oil pressure sensor 34 and a shift clutch oil pressure sensor 35, respectively, and are read by the hybrid system controller 31, and the rotational speeds of the motor 22 and the engine 21 and the oil pressures of the main clutch 23 and the shift clutch 24 are controlled by the hybrid system controller 31, so that the engine 21 is started.
As shown in fig. 4, in the process of starting the engine 21, the engine 21 and the main clutch 23 perform operation control according to five processes T 1、T2、T3、T4、T5, wherein the phase T 1 is the oil charge phase (Fill), the phase T 2 is the rotational speed pull-up phase (SpdPullUp), the phase T 3 is the reverse half junction phase (KP), the phase T 4 is the rotational speed synchronization phase (Sync), and the phase T 5 is the lock-up phase (LockUp). The motor 22 and the gear shifting clutch 24 perform micro-Slip motion control according to t 1、t2、t3 to thoroughly isolate the starting shake, wherein the stage t 1 is a draining stage (FillDown), the stage t 2 is a micro-Slip friction stage (Slip), and the stage t 3 is an oil pressure rebound stage (RampUp). Therefore, the rotating speed and the torque of the engine 21, the motor 22, the main clutch 23 and the gear shifting clutch 24 are coordinated and controlled, the process of starting the engine 21 when the hybrid electric vehicle enters the hybrid mode from the pure electric mode is precisely controlled, and the aims of ensuring the smoothness of the output torque of the hybrid electric system and ensuring good drivability when the vehicle mode is switched are fulfilled.
Next, a detailed process of starting the engine 21 will be described.
In step 110, switching the shift clutch to the slip state and holding, including:
Changing oil pressure of the gear shifting clutch according to a sliding grinding point of the gear shifting clutch until the rotating speed of a driving end of the gear shifting clutch connected with a motor rises to a first rotating speed;
the oil pressure of the gear shifting clutch is kept, and the motor is regulated to increase the first rotating speed to the second rotating speed, so that the gear shifting clutch is kept in a sliding and grinding state.
The method comprises the steps of:
Adjusting the oil pressure of the gear shifting clutch to a sliding friction point;
the oil pressure is continuously reduced at a first preset speed at the slipping point until the rotational speed of the drive end of the shifting clutch rises to a first rotational speed.
Referring to fig. 2 and 4, in step 110, the motor 22 and the shift clutch 24 are controlled in the t 1 phase and the t 2 phase, wherein in the t 1 phase, the oil pressure of the shift clutch 24 is reduced to the slip point P 1, and then the oil pressure is continuously reduced at a rate until the rotation speed of the driving end of the shift clutch 24 (i.e. the rotation speed of the sun gear 26) is increased to the first rotation speed N 1, at this time, the rotation speed of the driving end of the shift clutch 24 is higher than the driven end coupled with the wheel end, and the shift clutch 24 is slipped, and the step of t 2 is entered. After the shift clutch 24 enters a stage t 2, the oil pressure is latched, the motor 22 enters a speed regulation mode to regulate the speed with the second rotating speed N 3 as a target and is maintained after the driving end of the shift clutch 24 reaches N 3, so that stable micro-sliding friction of the shift clutch 24 is realized, and after that, the shift clutch 24 and the motor 22 always wait for the starting success of the engine 21 and the locking combination of the main clutch 23 in the stage t 2.
During the control of the motor 22 and the shift clutch 24 in the stages T 1 and T 2, that is, during the switching of the shift clutch 24 to the slip state, the control of the main clutch 23 and the engine 21 in the stage T 1 is performed first, the oil pressure of the main clutch 23 is raised to the half-engagement point, and a start request is sent to the engine 21 to wait for the engine 21 rotation speed to be pulled up. Step 120 is then entered.
In step 120, controlling the engine to lock up the main clutch after ignition start with the main clutch at the half-engagement point during the shift clutch remaining in the friction state, comprising:
when the rotating speed of the driving end of the gear shifting clutch reaches a third rotating speed, the oil pressure of the main clutch is lifted from the half-combining point to pull up the rotating speed of the engine, and the third rotating speed is larger than the first rotating speed and smaller than or equal to the second rotating speed;
after the engine reaches the ignition speed, regulating the oil pressure of the main clutch to a half-junction point;
controlling ignition and starting of the engine, and performing closed-loop torque control on the engine according to a target rotating speed corresponding to the third rotating speed;
After the rotational speed of the engine is raised to the target rotational speed, the main clutch is locked.
Wherein lifting the oil pressure of the main clutch from the half-engagement point to pull up the rotational speed of the engine includes:
lifting the oil pressure of the main clutch from the half-junction point through an open loop calibration feedforward oil pressure reference curve, and lifting the rotating speed of the engine to the ignition rotating speed;
Engine ignition is inhibited until the oil pressure of the main clutch is adjusted to the half-engagement point.
Wherein, locking master clutch includes:
lifting the oil pressure of the main clutch;
when the speed difference of the main clutch is less than or equal to the set threshold value, the oil pressure of the main clutch is raised according to the second preset slope to lock the main clutch.
Referring to fig. 2 and 4, in the stage T 2, when the driving end of the shifting clutch 24 is regulated to the third rotational speed N 2 (N 3 is not reached yet), the main clutch 23 is triggered to enter the control of the stage T 2, i.e. to enter the rotational speed pull-up stage. At stage T 2, the main clutch 23 begins to press and pull up the engine 21, the main clutch 23 oil pressure Pc0 (first fast and then slow) is controlled by the open loop calibrated feed forward oil pressure reference curve to pull up the engine 21 to the firing rate, at which point VCU first inhibits the engine 21 from firing, waiting for the main clutch 23 oil pressure to fall back to a range, which may be at or near the half-tie point, at the next stage (stage T 3) to allow firing. When the rotational speed of the engine 21 reaches the ignition rotational speed, the main clutch 23 enters a stage T 3 (KP stage) in which the oil pressure of the main clutch 23 is quickly returned to the vicinity of KP point and maintained, at this time, the engine 21 is started by ignition, and the engine 21 is subjected to closed-loop torque control with the target rotational speed (ring+offset) corresponding to the rotational speed N 2 of the active end of the current shift clutch 24 as a target. When the rotational speed of the engine 21 rises to the target rotational speed, a phase T 4, namely a rotational speed synchronization phase is entered, the phase carries out 0 torque control on the engine 21, meanwhile, the main clutch 23 is gradually pressed by the closed-loop control oil pressure of the main clutch 23, so that the engine 21 is gradually synchronized with the wheel end, when the speed difference of the main clutch 23 is smaller than or equal to a set threshold value, the phase T 4 (LockUp) is entered, and the oil pressure of the main clutch 23 is increased according to the slope to be quickly locked. The engine 21 is thus completed to fire and lock the main clutch 23, and the process proceeds to step 130.
In step 130, adjusting the drive end rotational speed of the shift clutch to synchronize with the wheel end and lock up the shift clutch includes:
the motor is regulated so as to reduce the rotating speed of the driving end of the gear shifting clutch from the second rotating speed to a fourth rotating speed synchronous with the wheel end;
when the rotation speed of the driving end of the shifting clutch is reduced to a fifth rotation speed, the oil pressure of the shifting clutch is increased to lock the shifting clutch, and the fifth rotation speed is smaller than the fourth rotation speed.
Referring to fig. 2 and 4, after the main clutch 23 is engaged in a locked state, the motor 22 changes the speed regulation target to reduce the rotation speed of the driving end of the shift clutch 24 from the second rotation speed N 3 to a fourth rotation speed N 5 (ring+offset) that can be synchronized with the wheel end, so as to attempt to synchronize the driving end of the shift clutch 24 with the wheel end toward the reverse speed, when the fifth rotation speed N 4 (N 5 is not yet reached), the shift clutch 24 and the motor 22 enter a t 3 stage (oil pressure reverse stage) from a t 2 stage, and after the shift clutch 24 enters a t 3 stage, the lock is quickly raised. At the same time, motor 22 exits the speed modulation and enters torque control and the engine 21 start process is fully completed in response to the next steady state mode torque distribution.
In the process, the KP oil pressure of the main clutch at the stage T 1 is measured by an oil filling test, the open loop calibration feedforward oil pressure reference curve Pc0 at the stage T 2 is obtained by optimizing calibration, the engine request torque is calculated by the hybrid electric vehicle controller and is sent to the engine controller, and the ignition speed of the engine and each speed threshold used in control are obtained by optimizing calibration of a real vehicle test.
Through the above process, when the vehicle detects that the vehicle needs to be switched from the pure mode to the hybrid mode, the main clutch performs action control according to five processes of Fill (oil charge) -SpdPullUp (rotational speed pull-up) -KP (back to half-engagement point) -Sync (rotational speed synchronization) -LockUp (locking), the shift clutch performs micro-Slip friction fit according to three processes of FillDown (oil drain) -Slip (micro-Slip friction) -RampUp (oil pressure return) to isolate engine shake, and in the action control stage of the main clutch and the shift clutch, the engine and the motor perform corresponding torque/rotational speed coordination fit, so that the engine is started when the main clutch is at the half-engagement point, shafting torque shake in the process of starting the engine is reduced to the greatest extent, and shake is effectively isolated through Slip friction control of the shift clutch, so that smooth and rapid mode switching is realized.
As described above, the control method for starting an engine of a hybrid vehicle of the present application switches and holds a shift clutch to a slip state, and during the period in which the shift clutch is held in the slip state, controls the engine to be started by ignition when the main clutch is at a half-engagement point, locks the main clutch, adjusts the rotation speed of the drive end of the shift clutch to be synchronized with the wheel end, and locks the shift clutch. The application starts the engine when the main clutch is at the half-joint point, so that shafting torque shake in the process of starting the engine is reduced to the greatest extent, and shake is effectively isolated through sliding friction control of the gear shifting clutch, thereby ensuring smoothness of output torque of the hybrid system and ensuring good drivability when the vehicle mode is switched.
Second embodiment
Fig. 5 is a schematic structural view of a control device for starting an engine of a hybrid vehicle according to a second embodiment. As shown in fig. 5, the control device for starting an engine of a hybrid vehicle of the present embodiment includes a memory 510 and a processor 520, wherein the memory 510 is configured to store at least one program instruction, and the processor 520 is configured to implement the control method for starting an engine of a hybrid vehicle according to the first embodiment by loading and executing the at least one program instruction.
The specific operation of the processor 520 is described in detail in the first embodiment, and is not repeated here.
The above embodiments are merely illustrative of the principles of the present application and its effectiveness, and are not intended to limit the application. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the application. Accordingly, it is intended that all equivalent modifications and variations of the application be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (9)

1. A control method for starting an engine of a hybrid electric vehicle, wherein a power system of the hybrid electric vehicle includes an engine, a motor, a main clutch, a shift clutch, and an output shaft, the engine and the motor are connected by the main clutch, and the motor and the output shaft are connected by the shift clutch, characterized in that the control method includes:
The oil pressure of the gear shifting clutch is downwards regulated according to the sliding friction point of the gear shifting clutch until the rotating speed of the gear shifting clutch connected with the driving end of the motor is increased to a first rotating speed;
maintaining the oil pressure of the gear shifting clutch, and regulating the speed of the motor to increase the first rotating speed to the second rotating speed so as to maintain the gear shifting clutch in a slipping state;
Controlling the engine to lock the main clutch after ignition start when the main clutch is at a half-engagement point during the period that the gear shifting clutch is kept in a slipping state;
and adjusting the rotation speed of the driving end of the gear shifting clutch to be synchronous with the wheel end and locking the gear shifting clutch.
2. The method of controlling a hybrid vehicle to start an engine according to claim 1, wherein the step of down-regulating the oil pressure of the shift clutch according to the slip point of the shift clutch until the rotational speed of the drive end of the shift clutch connection motor rises to a first rotational speed includes:
adjusting the oil pressure of the gear shifting clutch to a sliding friction point;
And continuously regulating the oil pressure at the first preset speed at the sliding point until the rotating speed of the driving end of the gear shifting clutch is increased to the first rotating speed.
3. The control method for starting an engine of a hybrid vehicle according to claim 1, characterized by further comprising:
And in the process of switching the gear shifting clutch to the slipping state, the oil pressure of the main clutch is increased to the half-engagement point.
4. A control method for starting an engine of a hybrid vehicle according to claim 3, wherein said controlling the engine after ignition start with the main clutch at a half-engagement point during a period in which said shift clutch is kept in a slipping state, includes:
When the rotation speed of the driving end of the gear shifting clutch reaches a third rotation speed, the oil pressure of the main clutch is lifted from the half-combining point to pull up the rotation speed of the engine, and the third rotation speed is larger than the first rotation speed and smaller than or equal to the second rotation speed;
Adjusting the oil pressure of the main clutch to the half-engagement point after the engine reaches an ignition speed;
controlling the ignition and starting of the engine, and performing closed-loop torque control on the engine according to the target rotating speed corresponding to the third rotating speed;
And locking the main clutch after the rotating speed of the engine is increased to the target rotating speed.
5. The control method for starting an engine of a hybrid vehicle according to claim 4, wherein said lifting oil pressure of said main clutch from said half engagement point to pull up a rotational speed of said engine, comprises:
lifting the oil pressure of the main clutch from the half-junction point through an open-loop calibration feedforward oil pressure reference curve, and lifting the rotating speed of the engine to the ignition rotating speed;
The engine ignition is inhibited until the oil pressure of the main clutch is adjusted down to the half-engagement point.
6. The control method for starting an engine of a hybrid vehicle according to claim 4, wherein said locking said main clutch comprises:
lifting the oil pressure of the main clutch;
And when the speed difference of the main clutch is smaller than or equal to a set threshold value, the oil pressure of the main clutch is increased according to a second preset slope so as to lock the main clutch.
7. The control method for starting an engine of a hybrid vehicle according to claim 1, wherein said adjusting a drive end rotational speed of said shift clutch in synchronization with a wheel end and locking said shift clutch comprises:
the motor is subjected to speed regulation, so that the rotating speed of the driving end of the gear shifting clutch is reduced from the second rotating speed to a fourth rotating speed synchronous with the wheel end;
and when the rotating speed of the driving end of the shifting clutch is reduced to a fifth rotating speed, the oil pressure of the shifting clutch is increased to lock the shifting clutch, and the fifth rotating speed is smaller than the fourth rotating speed.
8. The method for controlling a hybrid vehicle to start an engine according to claim 7, wherein said adjusting the driving end rotation speed of said shift clutch in synchronization with a wheel end and locking said shift clutch comprises:
Stopping speed regulation and torque control of the motor, and responding to torque distribution of the next steady-state mode.
9. A control apparatus for starting an engine of a hybrid vehicle, characterized by comprising a memory for storing at least one program instruction and a processor for implementing the control method for starting an engine of a hybrid vehicle according to any one of claims 1 to 8 by loading and executing the at least one program instruction.
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