CN108915884B - Engine start-stop control method and device and vehicle with same - Google Patents

Engine start-stop control method and device and vehicle with same Download PDF

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Publication number
CN108915884B
CN108915884B CN201810638229.6A CN201810638229A CN108915884B CN 108915884 B CN108915884 B CN 108915884B CN 201810638229 A CN201810638229 A CN 201810638229A CN 108915884 B CN108915884 B CN 108915884B
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China
Prior art keywords
crankshaft
engine
dead center
top dead
starter
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Active
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CN201810638229.6A
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Chinese (zh)
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CN108915884A (en
Inventor
韩文飞
何细根
陈浩
刘国庆
汪名月
赵福成
王瑞平
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Guizhou Geely Engine Co Ltd
Original Assignee
Guizhou Jili Engine Co ltd
Zhejiang Geely Holding Group Co Ltd
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Priority to CN201810638229.6A priority Critical patent/CN108915884B/en
Publication of CN108915884A publication Critical patent/CN108915884A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D37/00—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for
    • F02D37/02—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for one of the functions being ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/009—Electrical control of supply of combustible mixture or its constituents using means for generating position or synchronisation signals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/101—Engine speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/18—Control of the engine output torque

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

An engine start-stop control method, a control device and a vehicle with the control device are provided, wherein the control method comprises the steps of receiving an engine stop command; reducing a crankshaft speed of the engine to a first speed threshold; controlling a starter in a rotating speed control mode; collecting the rotating speed and the position of a crankshaft; judging the driving time when the crankshaft stops at the top dead center according to the crankshaft speed and the crankshaft position; and gradually reducing the rotating speed of the crankshaft through the starter according to the driving time length until the crankshaft stops at the top dead center position. The device can stop the crankshaft at the top dead center of the cylinder body when the engine is stopped, shorten the starting time of the engine and increase the smoothness when the engine is restarted.

Description

Engine start-stop control method and device and vehicle with same
Technical Field
The invention relates to the field of engine start-stop control, in particular to an engine start-stop control method, an engine start-stop control device and a vehicle with the engine start-stop control device.
Background
In the prior art, when an engine stops, a starter can pull an engine crankshaft to stop through a large negative torque, but cannot control the specific position of the crankshaft after the engine stops, so that when the engine restarts, due to the difference of piston positions, the engine needs to judge the positions of the crankshafts in each cylinder to determine an ignition sequence, which can increase the starting speed of the engine and also can cause interference on the smoothness of the engine.
Disclosure of Invention
In view of the above, the present invention provides an engine start-stop control method, an engine start-stop control device, and a vehicle having the same, which can stop a crankshaft at a top dead center of a cylinder block when an engine is stopped, shorten the time for starting the engine, and increase the smoothness when the engine is restarted.
The invention provides an engine start-stop control method, which comprises the following steps:
receiving an engine stop instruction;
reducing a crankshaft speed of the engine to a first speed threshold;
controlling a starter in a rotating speed control mode;
collecting the rotating speed and the position of a crankshaft;
judging the driving time when the crankshaft stops at the top dead center according to the crankshaft speed and the crankshaft position;
and gradually reducing the rotating speed of the crankshaft through the starter according to the driving time length until the crankshaft stops at the top dead center position.
Further, when an engine command is received, the method includes reducing the rotational speed of the crankshaft to a first rotational speed threshold via a torque control mode.
Further, when the position of the crankshaft is acquired, the position of the crankshaft in the specific cylinder with respect to the top dead center is acquired, and after the engine is stopped, the crankshaft in the specific cylinder is stopped at the position of the top dead center.
Further, when the engine is started, the engine is started in a specific ignition sequence and the specific cylinder block is ignited first.
Further, when the crankshaft position is collected, the method also comprises the following steps:
collecting the position of the crankshaft relative to the top dead center in each cylinder body, and selecting the cylinder body with the closest position of the crankshaft relative to the top dead center;
judging the driving time length when the selected crankshaft of the cylinder block reaches a top dead center according to the selected crankshaft position of the cylinder block;
and gradually reducing the rotating speed of the crankshaft through a starter until the crankshaft of the selected cylinder body stops at the position of the top dead center, and storing the serial number corresponding to the selected cylinder body.
Further, when the engine is started, the whole ignition sequence of the engine is adjusted according to the serial number of the cylinder stored in the previous stop, and the cylinder corresponding to the serial number is ignited firstly.
The invention also provides an engine start-stop control device, which comprises a starter, an engine, a control unit and a crankshaft position sensor;
the starter is connected with the engine through a driving belt wheel train;
the control unit receives a stop signal of the engine, controls the engine to stop oil injection and ignition, and controls the starter to reduce the crankshaft speed of the engine to a first speed threshold;
the control unit controls the starter to enter a rotating speed control mode;
the control unit acquires the rotating speed of a crankshaft of the engine and the position of the crankshaft through the crankshaft position sensor, and judges the driving time when the crankshaft stops at the top dead center according to the rotating speed of the crankshaft of the engine and the position of the crankshaft;
and the control unit gradually reduces the rotating speed of the crankshaft of the engine through the starter according to the driving duration, and stops the crankshaft of the engine at the position of the top dead center.
Further, the control unit collects the position of the crankshaft in a specific cylinder of the engine relative to a top dead center, and stops the crankshaft in the specific cylinder at the position of the top dead center when the engine is stopped.
Further, the control unit collects the positions of the crankshafts relative to the top dead center in all the cylinders of the engine, and selects the cylinder with the closest crankshaft relative to the top dead center; the control unit obtains the driving duration when the selected crankshaft in the cylinder body stops at the top dead center according to the position of the selected crankshaft in the cylinder body relative to the top dead center, stops the selected crankshaft in the cylinder body at the position of the top dead center when the engine stops, and stores the serial number corresponding to the selected cylinder body.
The invention also provides a vehicle which comprises the engine start-stop control device.
In summary, in the present invention, the rotation speed and the position of the crankshaft are determined when the engine is stopped, the driving duration when the crankshaft is stopped at the top dead center is determined in the rotation speed control mode of the starter, and finally, the rotation speed of the crankshaft is gradually reduced by the starter, so that the crankshaft is stopped at the top dead center. The crankshaft is stopped at the position of the top dead center when the engine is stopped, so that the judgment of the position of the crankshaft and the ignition sequence can be omitted when the engine is restarted, the starting time of the engine is saved, the smoothness performance of the engine when the engine is restarted is improved, furthermore, in the stopping process of the engine, the starter is controlled through a rotating speed control mode, the accuracy of the position of the crankshaft when the engine is stopped can be ensured through the control of the driving time length and the rotating speed, and meanwhile, the stability of the engine when the engine is stopped is improved. Further, by determining the position of the crankshaft in each cylinder, the cylinder in which the crankshaft is closest to the top dead center can be selected, and by stopping the crankshaft in the cylinder at the position of the top dead center, the stop time of the engine can be further shortened.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
Fig. 1 is a control logic diagram of an engine start-stop control method according to a first embodiment of the present invention.
FIG. 2 is a schematic diagram illustrating crankshaft position after engine shutdown is controlled using the engine start-stop control method of FIG. 1.
Fig. 3 is a system block diagram of an engine start-stop control apparatus provided by the present invention.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description is given with reference to the accompanying drawings and preferred embodiments.
In view of the above, the present invention provides an engine start-stop control method, an engine start-stop control device, and a vehicle having the same, which can stop a crankshaft at a top dead center of a cylinder block when an engine is stopped, shorten the time for starting the engine, and increase the smoothness when the engine is restarted.
Fig. 1 is a control logic diagram of an engine start-stop control method according to a first embodiment of the present invention. FIG. 2 is a schematic diagram illustrating crankshaft position after engine shutdown is controlled using the engine start-stop control method of FIG. 1. As shown in fig. 1 and 2, an engine start-stop control method according to a first embodiment of the present invention includes the steps of:
receiving an engine stop instruction;
reducing the engine speed to a first speed threshold;
controlling a starter in a rotating speed control mode;
collecting the rotating speed and the position of a crankshaft;
judging the driving time when the crankshaft stops at the top dead center according to the crankshaft speed and the crankshaft position;
and gradually reducing the rotating speed of the crankshaft through the starter according to the driving time length until the crankshaft stops at the top dead center position.
In the embodiment, the rotation speed and the position of the crankshaft are judged when the engine is stopped, the driving time length when the crankshaft is stopped at the top dead center is judged in the rotation speed control mode of the starter, and finally the rotation speed of the crankshaft is gradually reduced through the starter, so that the crankshaft is stopped at the position of the top dead center. The crankshaft is stopped at the position of the top dead center when the engine is stopped, so that the judgment of the position of the crankshaft and the ignition sequence can be omitted when the engine is restarted, the starting time of the engine is saved, the smoothness performance of the engine during starting is improved, furthermore, in the stopping process of the engine, the starter is controlled through a rotating speed control mode, the accuracy of the position of the crankshaft during stopping can be ensured through the control of the driving time length and the rotating speed, and meanwhile, the stability of the engine during stopping is improved.
Further, in the embodiment, when an engine stop instruction is received, the rotation speed of the crankshaft is firstly reduced to the first rotation speed threshold value through the torque control mode so as to shorten the stop time of the engine, that is, in the engine stop strategy, the starter firstly reduces the rotation speed of the engine through the torque control mode and then stops the crankshaft at a specific position through the rotation speed control mode. The first speed threshold may be determined based on engine and starter performance, and is preferably no greater than 200RPM (Revoltations Per Minute).
Further, as shown in FIG. 2, the position of the crankshaft 11 relative to top dead center (shown by the dashed line in FIG. 2) in a particular cylinder is collected when the position of the crankshaft 11 is collected to stop the crankshaft 11 at the top dead center position in the particular cylinder after the engine 12 is stopped, which may be determined based on the number of cylinders of the engine 12 and the need for a starting strategy for the engine 12. For example, in the three-cylinder engine 12, it is preferable that one cylinder is the specific cylinder, that is, the crankshaft 11 in one cylinder is stopped at the top dead center of the cylinder each time the engine 12 is stopped. When the engine 12 is restarted, the engine 12 will always start firing in this particular cylinder and start the engine in a particular firing sequence, which will greatly optimize the ride-through performance of the three-cylinder engine 12.
Further, in the present embodiment, the starter 13 is a starter 13 having a 48vbsg (belt drive starter generator) system, as shown in fig. 2, the starter 13 is disposed at the front end of the engine 12, and drives the engine 12 to operate through the driving belt 14.
In summary, in the present embodiment, the rotation speed and the position of the crankshaft are determined when the engine is stopped, the driving duration when the crankshaft is stopped at the top dead center is determined in the rotation speed control mode of the starter, and finally, the rotation speed of the crankshaft is gradually reduced by the starter, so that the crankshaft is stopped at the top dead center. The crankshaft is stopped at the position of the top dead center when the engine is stopped, so that the judgment of the position of the crankshaft and the ignition sequence can be omitted when the engine is restarted, the starting time of the engine is saved, the smoothness performance of the engine during starting is improved, furthermore, in the stopping process of the engine, the starter is controlled through a rotating speed control mode, the accuracy of the position of the crankshaft during stopping can be ensured through the control of the driving time length and the rotating speed, and meanwhile, the stability of the engine during stopping is improved.
The engine start-stop control method provided by the second embodiment of the present invention is basically the same as the engine start-stop control method provided by the first embodiment of the present invention, but is different in that when the crankshaft speed and the crankshaft position are acquired, the method further includes the following steps:
collecting the position of the crankshaft relative to the top dead center in each cylinder body, and selecting the cylinder body with the closest position of the crankshaft relative to the top dead center;
judging the driving time when the crankshaft in the cylinder body reaches the top dead center according to the position of the crankshaft in the cylinder body;
and gradually reducing the rotating speed of the crankshaft through a starter until the crankshaft in the cylinder body stops at the top dead center, and storing the serial number corresponding to the cylinder body.
In the embodiment, the position of the crankshaft in each cylinder is collected, and it is determined which crankshaft in the cylinder is closest to the top dead center, and finally the crankshaft in the cylinder is stopped at the top dead center by the starter, which further reduces the time for stopping the engine. When the engine is restarted, the whole ignition sequence of the engine can be adjusted according to the serial number of the cylinder block stored in the last stop, and the cylinder block corresponding to the serial number is ignited firstly.
Fig. 3 is a system block diagram of an engine start-stop control apparatus provided by the present invention. As shown in fig. 3, the start-stop control device for engine 22 according to the present invention includes starter 21, engine 22, control unit 23, and crank position sensor 24.
Wherein the starter 21 is connected to the engine 22 through a drive pulley train;
the control unit 23 receives a stop signal of the engine 22, controls the engine 22 to stop fuel injection and ignition, and simultaneously controls the starter 21 to reduce the crankshaft speed of the engine 22 to a first speed threshold;
the control unit 23 controls the starter 21 to enter a rotation speed control mode;
the control unit 23 acquires the rotation speed of the crankshaft and the position of the crankshaft through the crankshaft position sensor 24, and judges the driving duration when the crankshaft stops at the top dead center according to the rotation speed of the crankshaft and the position of the crankshaft;
the control unit 23 controls the starter 21 to gradually decrease the rotation speed of the crankshaft according to the driving time period to stop the crankshaft at the top dead center position.
Further, in the present embodiment, the control unit 23 collects the position of the crankshaft in the specific cylinder with respect to the top dead center, and stops the crankshaft in the specific cylinder at the position of the top dead center when the engine 22 is stopped.
Further, in other embodiments, the control unit 23 collects the positions of the crankshafts relative to the top dead center in all the cylinders, and selects the cylinder with the closest crankshaft position relative to the top dead center; the control unit 23 obtains the driving duration when the crankshaft in the cylinder block stops at the top dead center according to the position of the crankshaft in the cylinder block relative to the top dead center, and stops the crankshaft in the cylinder block at the position of the top dead center when the engine 22 stops. At the same time, the control unit 23 stores the serial number corresponding to the cylinder, and when the engine 22 is restarted, the control unit 23 ignites in the corresponding cylinder based on the serial number of the cylinder stored at the previous stop, and adjusts the overall ignition sequence of the engine 22 based on the serial number of the cylinder.
Further, in the present embodiment, the Control Unit 23 may be an ECU (Electronic Control Unit 23).
In summary, in the present invention, the rotation speed and the position of the crankshaft are determined when the engine is stopped, the driving duration when the crankshaft is stopped at the top dead center is determined in the rotation speed control mode of the starter, and finally, the rotation speed of the crankshaft is gradually reduced by the starter, so that the crankshaft is stopped at the top dead center. The crankshaft is stopped at the position of the top dead center when the engine is stopped, so that the judgment of the position of the crankshaft and the ignition sequence can be omitted when the engine is restarted, the starting time of the engine is saved, the smoothness performance of the engine during starting is improved, furthermore, in the stopping process of the engine, the starter is controlled through a rotating speed control mode, the accuracy of the position of the crankshaft during stopping can be ensured through the control of the driving time length and the rotating speed, and meanwhile, the stability of the engine during stopping is improved. Further, by determining the position of the crankshaft in each cylinder, the cylinder in which the crankshaft is closest to the top dead center can be selected, and by stopping the crankshaft in the cylinder at the position of the top dead center, the stop time of the engine can be further shortened.
The invention also provides a vehicle, which comprises the engine start-stop control device provided by the invention, and other technical characteristics of the vehicle are referred to in the prior art and are not described herein again.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. An engine start-stop control method is characterized in that: the method comprises the following steps:
receiving an engine stop instruction;
reducing a crankshaft speed of the engine to a first speed threshold;
controlling a starter in a rotating speed control mode;
collecting the rotating speed and the position of a crankshaft;
judging the driving time when the crankshaft stops at the top dead center according to the crankshaft speed and the crankshaft position;
and gradually reducing the rotating speed of the crankshaft through the starter according to the driving time length until the crankshaft stops at the top dead center position.
2. The engine start-stop control method according to claim 1, characterized in that: when an engine command is received, the method further includes reducing the rotational speed of the crankshaft to a first rotational speed threshold via a torque control mode.
3. The engine start-stop control method according to claim 1, characterized in that: when the position of the crankshaft is collected, the position of the crankshaft relative to the top dead center in the specific cylinder is collected, and after the engine is stopped, the crankshaft in the specific cylinder is stopped at the position of the top dead center.
4. The engine start-stop control method according to claim 3, characterized in that: when the engine is started, the engine is started in a specific ignition sequence and the specific cylinder is ignited first.
5. The engine start-stop control method according to claim 1, characterized in that: when collecting the crankshaft position, it also includes the following steps:
collecting the position of the crankshaft relative to the top dead center in each cylinder body, and selecting the cylinder body with the closest position of the crankshaft relative to the top dead center;
judging the driving time length when the selected crankshaft of the cylinder block reaches a top dead center according to the selected crankshaft position of the cylinder block;
and gradually reducing the rotating speed of the crankshaft through a starter until the crankshaft of the selected cylinder body stops at the position of the top dead center, and storing the serial number corresponding to the selected cylinder body.
6. The engine start-stop control method according to claim 5, characterized in that: when the engine is started, the whole ignition sequence of the engine is adjusted according to the serial number of the cylinder block stored during the last stop, and the cylinder block corresponding to the serial number is ignited firstly.
7. An engine start-stop control device characterized in that: the system comprises a starter, an engine, a control unit and a crankshaft position sensor;
the starter is connected with the engine through a driving belt wheel train;
the control unit receives a stop signal of the engine, controls the engine to stop oil injection and ignition, and controls the starter to reduce the crankshaft speed of the engine to a first speed threshold;
the control unit controls the starter to enter a rotating speed control mode;
the control unit acquires the rotating speed of a crankshaft of the engine and the position of the crankshaft through the crankshaft position sensor, and judges the driving time when the crankshaft stops at the top dead center according to the rotating speed of the crankshaft of the engine and the position of the crankshaft;
and the control unit gradually reduces the rotating speed of the crankshaft of the engine through the starter according to the driving duration, and stops the crankshaft of the engine at the position of the top dead center.
8. The engine start-stop control apparatus according to claim 7, characterized in that: the control unit collects the position of a crankshaft in a specific cylinder of the engine relative to a top dead center, and stops the crankshaft in the specific cylinder at the position of the top dead center when the engine is stopped.
9. The engine start-stop control apparatus according to claim 7, characterized in that: the control unit collects the positions of the crankshafts in all cylinders of the engine relative to a top dead center, and selects the cylinder with the closest crankshaft position relative to the top dead center; the control unit obtains the driving duration when the selected crankshaft in the cylinder body stops at the top dead center according to the position of the selected crankshaft in the cylinder body relative to the top dead center, stops the selected crankshaft in the cylinder body at the position of the top dead center when the engine stops, and stores the serial number corresponding to the selected cylinder body.
10. A vehicle, characterized in that: the vehicle includes the engine start-stop control apparatus according to any one of claims 7 to 9.
CN201810638229.6A 2018-06-20 2018-06-20 Engine start-stop control method and device and vehicle with same Active CN108915884B (en)

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CN101994593A (en) * 2009-08-25 2011-03-30 北京汽车研究总院有限公司 Method for quickly starting and stopping engine of hybrid electric vehicle and control circuit thereof
CN102767432A (en) * 2012-07-31 2012-11-07 长城汽车股份有限公司 Starting and stopping control method for direct-injection engine inside cylinder
CN109944682A (en) * 2017-12-21 2019-06-28 福特全球技术公司 Via the engine start of electric turbocharger

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4529190B2 (en) * 2008-08-08 2010-08-25 株式会社デンソー Engine stop control device
JP6070669B2 (en) * 2014-10-02 2017-02-01 トヨタ自動車株式会社 Engine stop device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009062959A (en) * 2007-09-10 2009-03-26 Mazda Motor Corp Control device of diesel engine
CN101994593A (en) * 2009-08-25 2011-03-30 北京汽车研究总院有限公司 Method for quickly starting and stopping engine of hybrid electric vehicle and control circuit thereof
CN102767432A (en) * 2012-07-31 2012-11-07 长城汽车股份有限公司 Starting and stopping control method for direct-injection engine inside cylinder
CN109944682A (en) * 2017-12-21 2019-06-28 福特全球技术公司 Via the engine start of electric turbocharger

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