EP3014113A1 - Procédé pour démarrer un moteur à combustion interne, dispositif, produit de programme d'ordinateur - Google Patents

Procédé pour démarrer un moteur à combustion interne, dispositif, produit de programme d'ordinateur

Info

Publication number
EP3014113A1
EP3014113A1 EP14729675.0A EP14729675A EP3014113A1 EP 3014113 A1 EP3014113 A1 EP 3014113A1 EP 14729675 A EP14729675 A EP 14729675A EP 3014113 A1 EP3014113 A1 EP 3014113A1
Authority
EP
European Patent Office
Prior art keywords
internal combustion
combustion engine
cylinders
state value
current state
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP14729675.0A
Other languages
German (de)
English (en)
Inventor
Stephan Uhl
Jens Tophoven
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3014113A1 publication Critical patent/EP3014113A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F02N19/00—Starting aids for combustion engines, not otherwise provided for
    • F02N19/004—Aiding engine start by using decompression means or variable valve actuation
    • 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
    • F02N99/00—Subject matter not provided for in other groups of this subclass
    • F02N99/002—Starting combustion engines by ignition means
    • F02N99/006—Providing a combustible mixture inside the cylinder
    • 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
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/02—Parameters used for control of starting apparatus said parameters being related to the engine
    • 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
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/02—Parameters used for control of starting apparatus said parameters being related to the engine
    • F02N2200/022—Engine speed
    • 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
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/02—Parameters used for control of starting apparatus said parameters being related to the engine
    • F02N2200/023—Engine temperature
    • 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
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/02—Parameters used for control of starting apparatus said parameters being related to the engine
    • F02N2200/024—Engine oil temperature
    • 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
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/12—Parameters used for control of starting apparatus said parameters being related to the vehicle exterior
    • F02N2200/122—Atmospheric temperature

Definitions

  • the invention relates to a method for starting an internal combustion engine for a motor vehicle, the at least two cylinders, a valve train having at least one inlet valve and at least one outlet valve for each of
  • Cylinder wherein at least the closing timing of the intake valves are variably adjustable, and a direct injection system, in particular
  • Direct injection and ignition is initiated in one of the cylinders.
  • the invention relates to a device according to the preamble of claim 8 and a computer program product according to the preamble of claim 9.
  • the start usually takes place via a so-called pinion starter, which accelerates the internal combustion engine via a torque impressed from the outside until the internal combustion engine then takes over further operation via the initiation of combustion in the cylinders.
  • pinion starter which accelerates the internal combustion engine via a torque impressed from the outside until the internal combustion engine then takes over further operation via the initiation of combustion in the cylinders.
  • the pinion starter or starter could be cheaper and smaller dimensions.
  • the electric machine could be made smaller, since the torque reserve for the resistance of the internal combustion engine decreases accordingly.
  • Such a torque reduction can be achieved by the use of a so-called decompression start, in which the starting process is initiated by injection and ignition in one of the cylinders.
  • the first ignition or injection in the cylinder performed, which is just resting in the expansion phase, so that the combustion initiates a torque in the crankshaft of the internal combustion engine.
  • the top dead center of the subsequent cylinder in the firing order slave cylinder
  • the inventive method with the features of claim 1 has the advantage that a safe direct start is guaranteed regardless of environmental conditions and lifetime influences of the internal combustion engine.
  • the invention provides that at the start of the engine
  • Closing time of at least one intake valve of at least one of the other cylinder is changed in dependence on at least one current state value.
  • Under the at least one other cylinder in this case is to be understood in the firing order on the one cylinder in which first the injection and ignition, the following cylinder. In particular, it is first the cylinder, which is the second in the firing order.
  • the current state value is an ambient temperature and / or a Ambient pressure to be detected. Ambient pressure and ambient temperature determine the filling of the respective cylinder for the initial combustion. It also affects the compression work of the follower cylinders. By adjusting the closing time depending on these
  • Ambient values can be appropriately adjusted or corrected for a base closure time, so that it satisfies the conditions and the required decompression performance.
  • the engine temperature has a decisive influence on the friction of the internal combustion engine and thus also on the speed curve during the start, so that by adjusting the
  • Closing time depending on the engine temperature of the starting process is further optimized.
  • Lubricant state in particular a lubricant temperature of the
  • Lubricant state a viscosity of the lubricant, in particular a the
  • the value representing the viscosity of the lubricant is recorded. This can be done by known sensors.
  • the lubricant ages with time, with its viscosity due to fuels! changed ntrag, abrasion and / or coking, which has a direct impact on the friction of the internal combustion engine.
  • the temperature of the lubricant of the internal combustion engine also has an influence on the engine friction and thus on the overcoming
  • the closing time instead of later relocated to earlier, since in this case the torque to be overcome is correspondingly lower and the run-up of the engine can be done faster or to be overcome decompression also smaller.
  • a rotational speed of the internal combustion engine is detected as the current state value. While the aforementioned state values provide a so-called off-line correction of the decompression strategy before initiating the Startup, the detection and consideration of the speed of the internal combustion engine is a so-called on-line correction, in this case the decompression strategy, which is performed during the startup process. By detecting the rotational speed, it is determined how the start course of the
  • Intake valve can be "salvaged" by subsequent cylinder by a later
  • the closing time is selected such that an optimum decompression for the start of the internal combustion engine takes place in the respective cylinder.
  • the device according to the invention with the features of claim 8 is characterized by a specially prepared control device, the means for
  • the means are in particular a processor on which the method can be executed as a program. During operation, this results in the aforementioned advantages for the starting process of the internal combustion engine.
  • inventive computer program product with the features of claim 9 is characterized in that it is the inventive
  • Figure 2 shows a first embodiment of a startup
  • Figure 3 shows a second embodiment of the starting process.
  • FIG. 1 shows in a simplified flowchart a method for starting an internal combustion engine which has at least two cylinders, in the present case six cylinders, and a valvetrain, wherein the valvetrain has at least one inlet valve and at least one outlet valve for each of the cylinders, and wherein at least the closing time of the Inlet valves is variably adjustable.
  • the internal combustion engine also has a gasoline direct injection system by means of which fuel can be introduced directly into the cylinder.
  • Each of the cylinders is also associated with an ignition device, in particular a spark plug, to ignite the fuel introduced into the respective cylinder.
  • the internal combustion engine should by a direct start or
  • Decompression start are put into operation, for which purpose fuel is injected into a cylinder whose piston is stationary in the expansion phase, and an ignition is initiated. The resulting combustion passes through the piston a rotary motion in the crankshaft
  • the first ignited cylinder will be referred to below as the starting cylinder.
  • the advantageous method provides that at the start of the closing time of at least one intake valve of at least one of the slave cylinder, ie one of the cylinders, which are in the firing order after the start cylinder, depending on at least one current state value is changed.
  • the closing times of the intake valves of the first and second cylinders following in the ignition sequence are changed as a function of the current state value.
  • the basic control time is preferably stored in an engine control unit as a function of the parking position of the internal combustion engine and is available as a starting point for the further process. In the present case, it is provided that initially a so-called off-line correction or adaptation of the closing time of the intake valves is carried out, as shown by way of example in a flowchart in FIG. Because optimal
  • a first step S1 the starting cylinder is first determined as a function of the parking position of the internal combustion engine, in which the starting process is to be initiated. This then results in which subsequent cylinders the closing times of the intake valves should be changed. In the internal combustion engine with six cylinders, it is for example from the fourth cylinder or from the third
  • the ambient pressure and the ambient temperature determine the charge for the initial combustion as well as that of the
  • a lubricant state T s is detected by a lubricant of the internal combustion engine, in particular engine oil.
  • the lubricant state T s is a viscosity of
  • the closing time of the respective intake valve is also corrected in a step S4, since the state of the lubricant also influences the friction of the internal combustion engine
  • step S5 the start time until reaching a specific minimum engine speed and / or the minimum engine speed during the compression strokes of the internal combustion engine is measured. With these values, wear phenomena of the internal combustion engine, such as, for example, can then be determined via an adaptation function in a step S6
  • steps S2, S3 and S4 can also be performed in a different order than that presented here.
  • FIG. 2 and 3 each show a diagram in which the speed n of the internal combustion engine is recorded over the time t.
  • a speed curve of an optimal or planned start course of the internal combustion engine is represented by a first curve n 0 .
  • the actually detected starting course n s gives way to lower rotational speeds, which are due to an insufficient starting speed
  • Decompression of the slave cylinder are conditional and lead to a start abort.
  • Procedure further changes the closing times of the intake valves of the slave cylinder to late or set a stronger decompression of the slave cylinder. This extends the total start time of the
  • Figure 3 shows a better than the expected speed curve n 0 speed curve n B , which leads already at the beginning to higher speeds than expected.
  • the starting curve can be further accelerated by the respective cylinder filling is built up faster than to

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Valve Device For Special Equipments (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)

Abstract

L'invention concerne un procédé pour démarrer un moteur à combustion interne pour un véhicule automobile, lequel moteur présente au moins deux cylindres, une commande de soupape comprenant au moins une soupape d'admission et au moins une soupape de sortie pour chaque cylindre, au moins les moments de fermeture des soupapes d'admission pouvant être réglés de manière variable, et un système d'injection direct, en particulier un système d'injection directe d'essence, le démarrage étant initié par une injection directe et un allumage dans un des cylindres. Selon l'invention, lors du démarrage, le moment de fermeture d'au moins une soupape d'admission d'au moins un autre des cylindres est modifié en fonction d'au moins une valeur d'état actuelle.
EP14729675.0A 2013-06-26 2014-06-13 Procédé pour démarrer un moteur à combustion interne, dispositif, produit de programme d'ordinateur Withdrawn EP3014113A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013212168.7A DE102013212168B4 (de) 2013-06-26 2013-06-26 Verfahren zum Starten einer Brennkraftmaschine, Vorrichtung, Computer-Programmprodukt
PCT/EP2014/062332 WO2014206765A1 (fr) 2013-06-26 2014-06-13 Procédé pour démarrer un moteur à combustion interne, dispositif, produit de programme d'ordinateur

Publications (1)

Publication Number Publication Date
EP3014113A1 true EP3014113A1 (fr) 2016-05-04

Family

ID=50933177

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14729675.0A Withdrawn EP3014113A1 (fr) 2013-06-26 2014-06-13 Procédé pour démarrer un moteur à combustion interne, dispositif, produit de programme d'ordinateur

Country Status (6)

Country Link
US (1) US10563634B2 (fr)
EP (1) EP3014113A1 (fr)
JP (1) JP6271722B2 (fr)
CN (1) CN105324575B (fr)
DE (1) DE102013212168B4 (fr)
WO (1) WO2014206765A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013212168B4 (de) 2013-06-26 2022-02-03 Robert Bosch Gmbh Verfahren zum Starten einer Brennkraftmaschine, Vorrichtung, Computer-Programmprodukt
DE102017009269A1 (de) * 2017-10-06 2019-04-11 Daimler Ag Verfahren zu einem Start einer Brennkraftmaschine, insbesondere eines Hybridantriebs, und Brennkraftmaschine insbesondere eines Hybridantriebs, und Brennkraftmaschine, insbesondere zur Durchführung des Verfahrens

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JP3939905B2 (ja) * 2000-07-27 2007-07-04 株式会社日立製作所 エンジン始動装置
DE50209970D1 (de) 2002-05-14 2007-05-31 Ford Global Tech Llc Verfahren zur Vorbereitung des Anlassens einer Brennkraftmaschine
EP1403511A1 (fr) * 2002-09-30 2004-03-31 Mazda Motor Corporation Système de démarrage pour moteur à combustion interne
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Also Published As

Publication number Publication date
DE102013212168A1 (de) 2014-12-31
CN105324575B (zh) 2019-04-30
JP2016522359A (ja) 2016-07-28
US10563634B2 (en) 2020-02-18
DE102013212168B4 (de) 2022-02-03
WO2014206765A1 (fr) 2014-12-31
JP6271722B2 (ja) 2018-01-31
CN105324575A (zh) 2016-02-10
US20160146175A1 (en) 2016-05-26

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