CN112590767A - P2 hybrid system and method for reducing impact when switching hybrid mode - Google Patents

P2 hybrid system and method for reducing impact when switching hybrid mode Download PDF

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Publication number
CN112590767A
CN112590767A CN202011518894.5A CN202011518894A CN112590767A CN 112590767 A CN112590767 A CN 112590767A CN 202011518894 A CN202011518894 A CN 202011518894A CN 112590767 A CN112590767 A CN 112590767A
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CN
China
Prior art keywords
engine
clutch
mode
transmission
motor
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Pending
Application number
CN202011518894.5A
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Chinese (zh)
Inventor
谢嘉
李晓东
刘小红
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Guizhou Winstar Hydraulic Transmission Machinery Co Ltd
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Guizhou Winstar Hydraulic Transmission Machinery Co Ltd
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Application filed by Guizhou Winstar Hydraulic Transmission Machinery Co Ltd filed Critical Guizhou Winstar Hydraulic Transmission Machinery Co Ltd
Priority to CN202011518894.5A priority Critical patent/CN112590767A/en
Publication of CN112590767A publication Critical patent/CN112590767A/en
Pending legal-status Critical Current

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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
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B60W20/40—Controlling the engagement or disengagement of prime movers, e.g. for transition between prime movers
    • 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
    • B60W30/20—Reducing vibrations in the driveline
    • 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
    • B60W30/20—Reducing vibrations in the driveline
    • B60W2030/206—Reducing vibrations in the driveline related or induced by the engine

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Hybrid Electric Vehicles (AREA)

Abstract

The invention provides a P2 hybrid system and a method for slowing down impact when switching a hybrid mode, comprising an engine, a motor and a transmission; the engine and the motor are connected through a CO clutch, the motor and the transmission are connected through a transmission clutch, the engine and the motor are further connected with an oil tank and a battery respectively, the transmission is connected with a differential, and the differential outputs power to wheels through a rotating shaft. According to the invention, the engine torque is reduced in the process of gradually compressing the C0 clutch to switch in the power of the engine, and the buffer effect is achieved through the micro-sliding friction state of the transmission clutch, so that the impact generated at the wheel end is avoided, and the smoothness of mode switching is provided.

Description

P2 hybrid system and method for reducing impact when switching hybrid mode
Technical Field
The invention relates to a P2 hybrid system and a method for reducing impact when switching a hybrid mode.
Background
According to the existing vehicle, in order to achieve environmental protection and energy conservation while achieving sufficient cruising, many vehicles adopt an oil point hybrid mode, however, in the process of switching from a pure electric mode to a hybrid driving mode, due to sudden intervention of engine power, torque disturbance can be generated on a power transmission chain, impact torque is generated at a wheel end, and the smoothness of mode switching is reduced.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a P2 hybrid system and a method for reducing impact when switching the hybrid mode.
The invention is realized by the following technical scheme.
The invention provides a P2 hybrid system and a method for slowing down impact when switching a hybrid mode, comprising an engine, a motor and a transmission; the engine and the motor are connected through a CO clutch, the motor and the transmission are connected through a transmission clutch, the engine and the motor are further connected with an oil tank and a battery respectively, the transmission is connected with a differential, and the differential outputs power to wheels through a rotating shaft.
The engine is also connected with an auxiliary starting motor.
The transmission clutch is mounted within the transmission.
Including pure electric mode and hybrid drive mode, the motor is the disengagement state under the pure electric mode, and the engine is closed, is the motor power supply through the battery, and the motor passes through the derailleur and transmits power to the wheel, and the process of pure electric mode to hybrid drive mode conversion is:
starting an engine to an idle speed;
secondly, after the engine is started successfully, the engine enters a closed loop speed regulation mode, and the rotating speed is regulated to be the target speed;
the CO clutch enters an oil filling preparation state and detects whether the engine reaches a target rotating speed;
the engine exits the closed loop regulation mode and reduces the torque of the engine;
starting an engine to an idle speed;
secondly, after the engine is started successfully, the engine enters a closed loop speed regulation mode, and the rotating speed is regulated to be the target speed;
the CO clutch enters an oil filling preparation state and detects whether the engine reaches a target rotating speed;
the engine exits the closed loop regulation mode and reduces the torque of the engine;
after the CO clutch enters a sliding friction state and is gradually compressed, the transmission clutch is gradually compressed;
sixthly, the engine returns to normal driving;
and completing the switching of the hybrid driving mode.
The target speed is the rotational speed of the motor plus the maximum differential speed.
The preparation method for the CO clutch to enter oil filling comprises the following steps:
the CO clutch enters an oil filling preparation stage;
reducing the pressing force of the transmission clutch;
the speed changer clutch reaches a micro-sliding friction state;
and fourthly, completing oil filling preparation of the CO clutch.
And the engine is started by the aid of an auxiliary starting motor.
The invention has the beneficial effects that: the engine torque is reduced in the process of gradually compressing the C0 clutch to connect the engine power, and the buffer effect is achieved through the micro-sliding friction state of the transmission clutch, so that impact at the wheel end is avoided, and the mode switching smoothness is provided.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a flow chart of the operation of the present invention;
in the figure: 1-engine, 2-motor, 3-speed changer, 4-battery, 5-auxiliary starting motor, 6-differential, 7-oil tank, 8-speed changer clutch and 9-CO clutch.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
A P2 hybrid system and a method for reducing impact when switching a hybrid mode thereof comprise an engine 1, a motor 2 and a transmission 3; the engine 1 and the motor 2 are connected through a CO clutch 9, the motor 2 and the transmission 3 are connected through a transmission clutch 8, the engine 1 and the motor 2 are further connected with an oil tank 7 and a battery 4 respectively, the transmission 3 is connected with a differential mechanism 6, and the differential mechanism 6 outputs power to wheels through a rotating shaft.
The engine 1 is also connected to an auxiliary starter motor 5.
The transmission clutch 8 is mounted in the transmission 3.
Including pure electric mode and hybrid drive mode, motor 2 is disengagement state under the pure electric mode, and engine 1 closes, is the power supply of motor 2 through battery 4, and motor 2 passes through derailleur 3 with power transmission to the wheel, and the process of pure electric mode to hybrid drive mode conversion is:
starting the engine 1 to an idle speed;
secondly, after the engine is started successfully, the engine 1 enters a closed loop speed regulation mode, and the rotating speed is regulated to be the target speed;
the CO clutch 9 enters an oil filling preparation state and detects whether the engine reaches a target rotating speed;
the engine 1 exits the closed loop regulation mode and reduces the torque of the engine 1;
starting the engine 1 to an idle speed;
secondly, after the engine is started successfully, the engine 1 enters a closed loop speed regulation mode, and the rotating speed is regulated to be the target speed;
the CO clutch 9 enters an oil filling preparation state and detects whether the engine reaches a target rotating speed;
the engine 1 exits the closed loop regulation mode and reduces the torque of the engine 1;
after the CO clutch 9 enters a sliding friction state and is gradually compressed, the transmission clutch 8 is gradually compressed;
sixthly, the engine returns to normal driving;
and completing the switching of the hybrid driving mode.
The target speed is the rotational speed of the motor 2 plus the maximum differential speed.
The steps of the CO clutch 9 entering oil filling preparation are as follows:
the CO clutch 9 enters an oil filling preparation stage;
the pressing force of the transmission clutch 8 is reduced;
the transmission clutch 8 reaches a slight sliding friction state;
and fourthly, the CO clutch 9 finishes oil filling preparation.
When the engine 1 is started, the engine is assisted to start through an auxiliary starting motor 5.
The speed changer TM is a hydraulic mechanical automatic speed changer, and is formed by combining and connecting transmission mechanism components such as a planetary gear, a clutch and the like into gear transmission relations with different speed ratios. Cx is any possible clutch inside the transmission that can break the power train;
pure electric mode: the C0 clutch is in a disengaged state, the engine ICE is turned off, the electric machine EM works in a driving mode, power is transmitted to the electric machine EM by the battery Bat, then the power is transmitted to the vehicle by the EM through the planetary row of the corresponding gear in the transmission TM and the clutch Cx, and finally the power is converted into wheel end driving power for driving the vehicle to run. The clutch Cx is in a fully compressed state, and the driving end and the driven end do not rotate relatively.
Hybrid drive mode: the C0 clutch is closed, the engine is running drive and the electric machine EM is operating in drive mode. The power is transmitted to an engine ICE from a fuel Tank, is transmitted to an electric motor EM from a battery Bat, and is connected together through the closing relation of a C0 clutch to form common driving power. The common driving power is transmitted to the vehicle through the planetary row of the corresponding gear in the transmission TM and the clutch Cx, and is finally converted into wheel-end driving power for driving the vehicle to run.
In the process of switching from the pure electric mode to the hybrid driving mode, the engine is started by the aid of the independent starting motor Sta, then the speed is gradually regulated to a speed which is close to and higher than the EM (electromagnetic field) speed of the motor EM through a closed-loop speed regulation function, and the maximum speed difference is less than delta n.
In the process of switching from the pure electric mode to the hybrid driving mode, after the rotating speed of the engine is regulated to a reasonable rotating speed, the closed-loop speed regulation mode is exited, the torque limiting mode is entered, and the torque is reduced to a lower torque Tmin, so that the low-torque level drop of the rotating speed of the engine is realized.
In the process of switching from the pure electric mode to the hybrid driving mode, the pressing force of a clutch Cx of a transmission TM is gradually reduced until the micro-sliding friction critical state is reached. The micro-slip friction critical state means that the friction torque generated by the current pressing force of the clutch Cx is equal to or equivalent to the torque required to be transmitted by the clutch Cx, so that the clutch Cx is kept within a range of a rotational speed difference between the driving end and the driven end of the clutch at a micro-slip friction rotational speed Tmr.
In the process of switching from the pure electric mode to the hybrid driving mode, the pressing force of the C0 clutch is slowly increased, and continuous closed-loop friction control from a disengaging state to a closing state is automatically executed until the pressing force is completely pressed.
When the C0 clutch is applied, the clutch Cx is returned to a fully applied state and the engine torque exits torque limit mode and returns to normal drive.

Claims (7)

1. A P2 hybrid system comprises an engine (1), a motor (2) and a transmission (3), and is characterized in that: the engine (1) is connected with the motor (2) through a CO clutch (9), the motor (2) is connected with the transmission (3) through a transmission clutch (8), the engine (1) and the motor (2) are further connected with an oil tank (7) and a battery (4) respectively, the transmission (3) is connected with a differential (6), and the differential (6) outputs power to wheels through a rotating shaft.
2. The P2 blending system of claim 1, wherein: the engine (1) is also connected with an auxiliary starting motor (5).
3. The P2 blending system of claim 1, wherein: the transmission clutch (8) is mounted in the transmission (3).
4. A method for reducing impact when a P2 hybrid system switches a hybrid mode comprises an electric only mode and a hybrid driving mode, wherein an electric motor (2) in the electric only mode is in a disengagement state, an engine (1) is closed, the electric motor (2) is powered by a battery (4), and the electric motor (2) transmits power to wheels through a transmission (3), and is characterized in that: the process of converting the pure electric mode into the hybrid driving mode comprises the following steps:
starting an engine (1) to an idle speed;
secondly, after the engine (1) is started successfully, the engine enters a closed loop speed regulation mode, and the rotating speed is regulated to a target speed;
the CO clutch (9) enters an oil filling preparation state and detects whether the engine reaches a target rotating speed;
the engine (1) exits the closed-loop regulation mode and reduces the torque of the engine (1);
after the CO clutch (9) enters a sliding friction state and is gradually compressed, the transmission clutch (8) is gradually compressed;
sixthly, the engine returns to normal driving;
and completing the switching of the hybrid driving mode.
5. The method for mitigating shock when the P2 blending system switches the blending mode as recited in claim 4, wherein: the target speed is the rotating speed of the motor (2) plus the maximum differential speed.
6. The method for mitigating shock when the P2 blending system switches the blending mode as recited in claim 4, wherein: the step of preparing for the CO clutch (9) to enter oil filling is as follows:
the CO clutch (9) enters an oil filling preparation stage;
the pressing force of the transmission clutch (8) is reduced;
the transmission clutch (8) reaches a micro-sliding friction state;
and fourthly, the CO clutch (9) finishes oil filling preparation.
7. The method for mitigating shock when the P2 blending system switches the blending mode as recited in claim 4, wherein: when the engine (1) is started, the engine is started in an auxiliary mode through an auxiliary starting motor (5).
CN202011518894.5A 2020-12-21 2020-12-21 P2 hybrid system and method for reducing impact when switching hybrid mode Pending CN112590767A (en)

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Application Number Priority Date Filing Date Title
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Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101341041A (en) * 2005-10-20 2009-01-07 标致·雪铁龙汽车公司 Method for starting a hybrid vehicle heat engine
CN101968110A (en) * 2010-09-28 2011-02-09 贵州凯星液力传动机械有限公司 Hydrodynamic transmission buffering device for railway vehicle
US20130304293A1 (en) * 2011-01-26 2013-11-14 Toyota Jidosha Kabushiki Kaisha Control device of hybrid vehicle
US20160082951A1 (en) * 2014-09-23 2016-03-24 Hyundai Motor Company Method of controlling engine speed of hybrid vehicle
US20160176396A1 (en) * 2013-08-09 2016-06-23 Toyota Jidosha Kabushiki Kaisha Hybrid vehicle
CN105905108A (en) * 2016-04-27 2016-08-31 盛瑞传动股份有限公司 Finished automobile starting method based on P2 hybrid power transmission system
CN106080589A (en) * 2015-04-30 2016-11-09 丰田自动车株式会社 The control device of motor vehicle driven by mixed power
CN108025737A (en) * 2015-09-30 2018-05-11 爱信艾达株式会社 Control device
CN108622072A (en) * 2018-03-29 2018-10-09 上海汽车集团股份有限公司 Hybrid power automobile power assembly control method for series-mode frame
CN108698590A (en) * 2016-02-29 2018-10-23 舍弗勒技术股份两合公司 The method of internal combustion engine for starting hybrid vehicle and control unit for running this method
CN109435675A (en) * 2018-10-16 2019-03-08 广州汽车集团股份有限公司 Drive device for hybrid vehicle and its control method
CN109693673A (en) * 2018-12-29 2019-04-30 浙江鑫可精密机械有限公司 A kind of automatically controlled transmission device of new energy vehicle having retarder

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101341041A (en) * 2005-10-20 2009-01-07 标致·雪铁龙汽车公司 Method for starting a hybrid vehicle heat engine
CN101968110A (en) * 2010-09-28 2011-02-09 贵州凯星液力传动机械有限公司 Hydrodynamic transmission buffering device for railway vehicle
US20130304293A1 (en) * 2011-01-26 2013-11-14 Toyota Jidosha Kabushiki Kaisha Control device of hybrid vehicle
US20160176396A1 (en) * 2013-08-09 2016-06-23 Toyota Jidosha Kabushiki Kaisha Hybrid vehicle
US20160082951A1 (en) * 2014-09-23 2016-03-24 Hyundai Motor Company Method of controlling engine speed of hybrid vehicle
CN106080589A (en) * 2015-04-30 2016-11-09 丰田自动车株式会社 The control device of motor vehicle driven by mixed power
CN108025737A (en) * 2015-09-30 2018-05-11 爱信艾达株式会社 Control device
CN108698590A (en) * 2016-02-29 2018-10-23 舍弗勒技术股份两合公司 The method of internal combustion engine for starting hybrid vehicle and control unit for running this method
CN105905108A (en) * 2016-04-27 2016-08-31 盛瑞传动股份有限公司 Finished automobile starting method based on P2 hybrid power transmission system
CN108622072A (en) * 2018-03-29 2018-10-09 上海汽车集团股份有限公司 Hybrid power automobile power assembly control method for series-mode frame
CN109435675A (en) * 2018-10-16 2019-03-08 广州汽车集团股份有限公司 Drive device for hybrid vehicle and its control method
CN109693673A (en) * 2018-12-29 2019-04-30 浙江鑫可精密机械有限公司 A kind of automatically controlled transmission device of new energy vehicle having retarder

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Application publication date: 20210402