WO2021249214A1 - Procédé de commande d'injection de combustible pour moteur à injection directe - Google Patents

Procédé de commande d'injection de combustible pour moteur à injection directe Download PDF

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Publication number
WO2021249214A1
WO2021249214A1 PCT/CN2021/096973 CN2021096973W WO2021249214A1 WO 2021249214 A1 WO2021249214 A1 WO 2021249214A1 CN 2021096973 W CN2021096973 W CN 2021096973W WO 2021249214 A1 WO2021249214 A1 WO 2021249214A1
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WO
WIPO (PCT)
Prior art keywords
fuel injection
engine
control system
injections
water temperature
Prior art date
Application number
PCT/CN2021/096973
Other languages
English (en)
Chinese (zh)
Inventor
张慧峰
欣白宇
苗志慧
王强
龙立
杜大瑞
陈昊
Original Assignee
中国第一汽车股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中国第一汽车股份有限公司 filed Critical 中国第一汽车股份有限公司
Publication of WO2021249214A1 publication Critical patent/WO2021249214A1/fr

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    • 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
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/402—Multiple injections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
    • F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0215—Introducing corrections for particular conditions exterior to the engine in relation with elements of the transmission
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • 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
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • 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
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D2041/389—Controlling fuel injection of the high pressure type for injecting directly into the cylinder
    • 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
    • F02D2200/021—Engine temperature
    • 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
    • F02D2200/04—Engine intake system parameters
    • 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
    • F02D2200/50—Input parameters for engine control said parameters being related to the vehicle or its components
    • F02D2200/501—Vehicle speed
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • This application relates to the field of automobile technology, for example, to a method for controlling fuel injection of a direct injection engine.
  • GPF Gasoline Particulate Filter
  • the present application provides a method for controlling the fuel injection of a direct injection engine, which can reduce the particle emission of the engine without installing a particle trap, and meet the National VI B emission standard.
  • the fuel injection control method of a direct injection engine includes:
  • the control system detects whether the engine meets the fuel injection conditions, continues to perform fuel injection in response to the engine meeting the fuel injection conditions, and stops fuel injection in response to the engine does not meet the fuel injection conditions;
  • the control system calculates the fuel injection quantity required by the engine in the current working state
  • the control system determines whether to divide the fuel injection amount into more than two injections. In response to the determination result that more than two injections are required, the control system determines the number of fuel injections, the fuel injection pulse width, and the fuel injection angle, and downloads Send a fuel injection command; in response to the judgment result that there is no need to perform more than two injections, the control system determines the fuel injection pulse width and the fuel injection angle, and issues the fuel injection command.
  • Fig. 1 is a flowchart of a method for controlling fuel injection of a direct injection engine provided by an embodiment of the present application.
  • connection should be understood in a broad sense, unless otherwise clearly specified and limited.
  • connection can be a fixed connection or a detachable connection.
  • Connection can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication between two components.
  • connection can be a fixed connection or a detachable connection.
  • connection can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication between two components.
  • the "above” or “below” of the first feature of the second feature may include direct contact between the first and second features, or may include the first and second features Not in direct contact but through other features between them.
  • “above”, “above” and “above” the second feature of the first feature include the first feature being directly above and obliquely above the second feature, or merely indicating that the level of the first feature is higher than that of the second feature.
  • the “below”, “below” and “below” of the second feature of the first feature include the first feature directly below and obliquely below the second feature, or it simply means that the level of the first feature is smaller than the second feature.
  • the present application provides a direct injection engine fuel injection control method, including steps S1 to S5.
  • the control system detects whether the engine meets the fuel injection conditions, if the engine meets the fuel injection conditions, continue fuel injection, if the engine does not meet the fuel injection conditions, stop fuel injection.
  • the control system calculates the amount of fuel injection required by the engine in the current working state.
  • the control system judges whether to divide the fuel injection volume into more than two injections. If more than two injections are required, execute S4; if more than two injections are not required, execute S5.
  • the control system determines the number of injections, injection pulse width and injection angle, and issues injection instructions.
  • the control system determines the fuel injection pulse width and fuel injection angle, and issues fuel injection instructions.
  • the control system calculates the fuel injection required by the current engine, and then the control system determines whether more than two injections are required; if more than two injections are not required, the engine is guaranteed to work normally; when more than two injections are performed, it is determined The number of injections, the width of the injection pulse and the angle of the injection, and the issue of injection instructions.
  • step S1 the control system needs to determine whether the engine meets the fuel injection conditions.
  • the engine has an ignition failure; 2.
  • the engine performs super knock protection; 6.
  • the engine is broken Cylinder request; 8.
  • the engine synchronization state is abnormal.
  • the control system detects any of the above conditions, the engine fuel injection is prohibited, and fuel injection can be performed normally only when all conditions have not occurred. So as to ensure that the engine is in normal working condition, and protect the safety of vehicles and people.
  • step S2 the fuel injection amount is calculated by the intake air amount in the current working state of the engine.
  • step S4 the number of fuel injections determined by the control system is four or five.
  • step S4 to achieve five injections, at least one of the following conditions must be met.
  • the conditions include: the intake air volume of the engine is greater than the first set intake air volume, the vehicle speed is greater than the first set vehicle speed, and the fuel injection pulse width is greater than or equal to Minimum fuel injection limit, the water temperature of the engine is greater than or equal to the first set water temperature value and less than or equal to the second set water temperature value, and the engine start end time is greater than or equal to the first set time value and less than or equal to the second set value Time value, the car's gearbox is an automatic gearbox, and the catalytic converter is in a heated state. .
  • the above-mentioned conditions can be realized by selecting at least one of them in the control system to be regarded as a condition for achieving five injections.
  • the specific combination mode is not too limited here, and it can be adapted according to the vehicle model and working conditions.
  • the first set air intake amount can be determined through calibration according to actual conditions, and the first set vehicle speed can be determined through calibration according to actual conditions. This increases the flexibility of judging whether the five injection conditions are met.
  • the minimum fuel injection limit is determined by calibration
  • the first set water temperature value and the second set water temperature value can be determined by calibration
  • the first set time value and the second set time value can be manually calibrated.
  • the fuel injection volume required in the current working condition can be divided into five injections, so as to ensure that the fuel and air are fully mixed, and the fuel is fully burned, thereby reducing the particulate matter emitted by combustion.
  • step S4 to achieve four fuel injections, at least one of the following conditions must be met, and the conditions include: the intake air volume of the engine is greater than the second set intake air volume, and the engine speed is greater than or equal to the first set speed And less than or equal to the second set speed, the water temperature of the engine is greater than or equal to the third set water temperature value and less than or equal to the fourth set water temperature value, to meet the conditions that need to be met for four injections, including the engine start end time greater than Or equal to the third set time value and less than or equal to the fourth set time value.
  • the conditions mentioned above can be realized by selecting at least one of them in the control system to be regarded as a condition for achieving four injections.
  • the specific combination mode is not too limited here, and it can be adapted according to the vehicle model and working conditions.
  • the second set intake air volume can be determined through calibration according to actual needs, and the first set speed and second set speed can be determined through calibration according to actual needs, thereby increasing the determination of whether the four injection conditions are met Flexibility.
  • the third set water temperature value and the fourth set water temperature value can be determined through calibration according to actual needs, and the third set time value and the fourth set time value can be determined through manual calibration according to actual needs.
  • the fuel injection quantity required in the current working condition can be divided into four injections, so as to ensure that the fuel and air are fully mixed, and the fuel is fully burned, thereby reducing the particulate matter emitted by combustion.
  • more than two injections can be selected when the engine is in the intake stroke and the compression stroke, so as to ensure that the fuel and air are fully mixed, so that the fuel is fully burned during the combustion work process.
  • more than two injections can be selected when the engine is in the intake stroke.
  • the fuel injection modes of the engine include:
  • Two injections are used for catalyst heating, that is, the two injection mode when it is judged that the catalyst needs to be heated.
  • High-pressure start injection mode that is, the injection mode under high-pressure start conditions.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

Procédé de commande d'injection de combustible destiné à un moteur à injection directe, le procédé comprenant les étapes suivantes : S1, un système de commande détecte si un moteur satisfait à une condition d'injection de combustible, et si le moteur satisfait à une condition d'injection de combustible, l'injection de combustible est continuée, et si le moteur ne satisfait pas à une condition d'injection de combustible, l'injection de combustible est arrêtée ; S2, le système de commande calcule une quantité d'injection de combustible requise par le moteur dans l'état de fonctionnement actuel ; S3, le système de commande détermine s'il faut diviser la quantité d'injection de combustible en plus de deux temps d'injection, et en réponse à un résultat de détermination établissant qu'il est nécessaire d'effectuer plus de deux temps d'injection, il exécute S4, et en réponse à un résultat de détermination établissant qu'il n'est pas nécessaire d'effectuer plus de deux temps d'injection, il exécute S5 ; S4, le système de commande détermine le nombre de temps d'injection de combustible, une largeur d'impulsion d'injection de combustible et un angle d'injection de combustible, et émet une instruction d'injection de combustible ; S5, le système de commande détermine une largeur d'impulsion d'injection de combustible et un angle d'injection de combustible, et émet une instruction d'injection de combustible.
PCT/CN2021/096973 2020-06-09 2021-05-28 Procédé de commande d'injection de combustible pour moteur à injection directe WO2021249214A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202010518295.7 2020-06-09
CN202010518295.7A CN111622855A (zh) 2020-06-09 2020-06-09 一种直喷发动机燃料喷射的控制方法

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WO2021249214A1 true WO2021249214A1 (fr) 2021-12-16

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Publication number Priority date Publication date Assignee Title
CN111622855A (zh) * 2020-06-09 2020-09-04 中国第一汽车股份有限公司 一种直喷发动机燃料喷射的控制方法
CN112648097A (zh) * 2020-12-29 2021-04-13 东台市建东机械制造有限公司 一种柴油发动机的喷油控制方法
CN113834662B (zh) * 2021-09-22 2024-03-12 哈尔滨东安汽车发动机制造有限公司 一种验证发动机可变喷油角度对pn数量影响的方法

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US5320079A (en) * 1992-02-05 1994-06-14 Fuji Jukogyo Kabushiki Kaisha Fuel injection control system for an internal combustion engine and method thereof
JPH09228869A (ja) * 1996-02-23 1997-09-02 Nissan Motor Co Ltd 内燃機関の空燃比制御装置
CN105569863A (zh) * 2015-12-31 2016-05-11 广州汽车集团股份有限公司 发动机喷油控制方法及发动机电控单元
CN106246437A (zh) * 2016-08-26 2016-12-21 重庆隆鑫机车有限公司 基于发动机循环的发动机点火控制和喷油控制方法
CN106762176A (zh) * 2016-12-13 2017-05-31 安徽航瑞航空动力装备有限公司 一种二缸机四冲程进气压力计算方法
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JP2007100623A (ja) * 2005-10-06 2007-04-19 Denso Corp ディーゼル機関の燃料噴射制御装置
CN103291482B (zh) * 2013-05-24 2016-07-13 潍柴动力股份有限公司 一种发动机的喷油控制方法、装置及发动机
CN106812621B (zh) * 2015-11-30 2019-11-22 长城汽车股份有限公司 一种发动机的喷油控制方法及系统
CN106121846A (zh) * 2016-08-15 2016-11-16 江西汇尔油泵油嘴有限公司 一种柴油机喷油控制方法
JP6728295B2 (ja) * 2018-10-04 2020-07-22 本田技研工業株式会社 内燃機関制御装置、内燃機関制御方法及び車両

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5320079A (en) * 1992-02-05 1994-06-14 Fuji Jukogyo Kabushiki Kaisha Fuel injection control system for an internal combustion engine and method thereof
JPH09228869A (ja) * 1996-02-23 1997-09-02 Nissan Motor Co Ltd 内燃機関の空燃比制御装置
CN105569863A (zh) * 2015-12-31 2016-05-11 广州汽车集团股份有限公司 发动机喷油控制方法及发动机电控单元
CN106246437A (zh) * 2016-08-26 2016-12-21 重庆隆鑫机车有限公司 基于发动机循环的发动机点火控制和喷油控制方法
CN106762176A (zh) * 2016-12-13 2017-05-31 安徽航瑞航空动力装备有限公司 一种二缸机四冲程进气压力计算方法
CN111622855A (zh) * 2020-06-09 2020-09-04 中国第一汽车股份有限公司 一种直喷发动机燃料喷射的控制方法

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