WO2019243003A1 - Système de refroidissement pour un moteur à combustion interne, procédé pour le faire fonctionner - Google Patents

Système de refroidissement pour un moteur à combustion interne, procédé pour le faire fonctionner Download PDF

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Publication number
WO2019243003A1
WO2019243003A1 PCT/EP2019/063730 EP2019063730W WO2019243003A1 WO 2019243003 A1 WO2019243003 A1 WO 2019243003A1 EP 2019063730 W EP2019063730 W EP 2019063730W WO 2019243003 A1 WO2019243003 A1 WO 2019243003A1
Authority
WO
WIPO (PCT)
Prior art keywords
water
metering valve
fuel
pressure
valve
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.)
Ceased
Application number
PCT/EP2019/063730
Other languages
German (de)
English (en)
Inventor
Pascal Gladel
Peter Schenk
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 WO2019243003A1 publication Critical patent/WO2019243003A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04—Injectors with heating, cooling, or thermally-insulating means
    • F02M53/043—Injectors with heating, cooling, or thermally-insulating means with cooling means other than air cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/022—Adding fuel and water emulsion, water or steam
    • F02M25/0227—Control aspects; Arrangement of sensors; Diagnostics; Actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/022—Adding fuel and water emulsion, water or steam
    • F02M25/0228—Adding fuel and water emulsion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
    • F02M43/02—Pumps peculiar thereto
    • 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
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • Cooling system for an internal combustion engine method for operating
  • the invention relates to a cooling system for an internal combustion engine, in particular a motor vehicle, with at least one of the internal combustion engine
  • Injection valve upstream high pressure pump for delivering the fuel to the injection valve and with a water injection device, which has a metering valve upstream of the high pressure pump for metering water into the fuel.
  • the invention further relates to a method for operating such a cooling system.
  • Knocking tendency is to retard an ignition angle, which means the fuel consumption is the same when the engine output is requested increases.
  • it is also known to enrich the mixture by increasing the amount of fuel, which also increases fuel consumption.
  • water it is also known to add water to the combustion mixture in order to reduce the tendency to knock and to lower the exhaust gas temperatures.
  • it is known to either inject water directly into a combustion chamber or into the intake tract of the internal combustion engine. If the water is injected directly into the combustion chamber, it is usually mixed with the fuel upstream of an injection valve assigned to the combustion chamber. The fuel is usually conveyed into the combustion chamber or combustion chambers of the internal combustion engine by means of a high-pressure pump. To ensure easy mixing of the water with the fuel, the water is the
  • the cooling system according to the invention with the features of claim 1 has the advantage that the metering accuracy of the water injection is increased by the use of an advantageous sensor device and malfunction is easily diagnosed. According to the invention it is provided that the
  • Dosing valve a sensor device for detecting the water pressure
  • the mode of action of the water injection or its influence on the mixture formation can be precisely determined to a high degree and the water injection can thus be optimally adjusted so that the admixed
  • Amount of water can be determined and regulated more precisely and in particular Tolerances of the metering valve can be easily compensated.
  • a simple diagnosis of the metering valve is possible in the flow direction, so that a malfunction of the metering valve can be concluded simply as a function of the recorded pressure values.
  • aging of the metering valve can also be detected, for example.
  • the sensor device has a first pressure sensor arranged upstream of the metering valve and a second pressure sensor arranged downstream of the metering valve.
  • the two separate pressure sensors allow the pressure values upstream and downstream of the metering valve or upstream and downstream of the metering valve to be measured simply and reliably.
  • a suitable evaluation logic is used in
  • the amount of water delivered through the metering valve is determined as a function of the recorded pressure values.
  • the sensor device has a differential pressure sensor which is connected upstream of the metering valve and downstream of the metering valve to a water line leading to the high pressure pump.
  • High-pressure pump assigned at least one fuel pressure sensor, which monitors the fuel pressure. So is the exact determination of the dosed
  • the fuel pressure sensor is preferably connected upstream of the high-pressure pump in order to monitor the delivery pressure of the fuel which is fed to the high-pressure pump, so that the metering valve can be optimally controlled as a function of the detected fuel pressure in order to set an advantageous fuel-water mixture by means of the high-pressure pump.
  • the high-pressure pump is therefore preferably preceded by a low-pressure pump, which sucks the fuel in particular out of the fuel tank and supplies it to the high-pressure pump. Because the water is injected into the fuel system through the fuel system
  • Combustion chamber is injected, the injection valve and the high pressure pump are assigned to the cooling system in the present case.
  • the cooling system preferably has a control unit which is specially designed to correct an opening time of the metering valve as a function of the pressure values detected by the sensor device. For example, opening times are reduced with increasing aging of the metering valve and / or assembly or manufacturing tolerances are compensated in order to match an actual water volume to a target water volume that is used to cool the
  • control device is designed to do the following
  • the method according to the invention with the features of claim 7 is characterized in that a water pressure upstream of the metering valve and a water pressure downstream of the metering valve are detected and a quantity of water delivered by the metering valve is determined as a function of the detected pressure values.
  • an opening time of the metering valve is varied as a function of the determined amount of water, so that the determined amount of water corresponds to a desired amount of water.
  • a fuel pressure value is taken into account when determining the amount of water in the metering valve.
  • the fuel pressure upstream of the high-pressure pump is monitored in order to ensure an optimal adjustment of the water quantity.
  • Metering valve is monitored. By detecting the pressure curves before and after the metering valve depending on known control times, implausible delay times, a permanently closed or a permanently open metering valve can be easily recognized. This is a robust one
  • Figure 1 shows an advantageous embodiment of a cooling system
  • FIG. 2 shows a further exemplary embodiment of the cooling system from FIG. 1.
  • the internal combustion engine 1 shows a simplified illustration of an internal combustion engine 1 with an advantageous cooling system 2.
  • the internal combustion engine 1 has a plurality of cylinders 3, in each of which a piston 4 is mounted so as to be longitudinally displaceable and is coupled to a crankshaft by a connecting rod 5.
  • the respective cylinder 3 is closed by a cylinder head 6, through which an inlet duct 7 and an outlet duct 8 into the respective cylinder 3,
  • Inlet channel 7 and outlet channel 8 are each assigned an actuatable inlet valve 10 or outlet valve 11.
  • the inlet channel 7 and outlet channel 8 are each assigned an actuatable inlet valve 10 or outlet valve 11.
  • Cylinder head 6 each have an injection valve 12 associated with them, which according to the present exemplary embodiment is connected to a high-pressure rail 13 for fuel injection.
  • the high pressure rail 13 is one
  • High pressure pump 14 upstream.
  • the high-pressure pump 14 is connected on the suction side by a line 15 to a low-pressure fuel system, which is not here is shown in more detail.
  • the low pressure fuel system has one
  • Low-pressure pump by means of which the fuel is conveyed from a fuel tank, in particular sucked in, and supplied to the high-pressure pump 14.
  • the high pressure pump 14 is in particular by a
  • Internal combustion engine 1 mechanically coupled cam drive, as shown in simplified form in Figure 1.
  • the cooling system 2 has its own tank 16, in which water is kept as a coolant.
  • the tank 16 is assigned a water pump 17, which is connected on the suction side to the tank 16 by a line 18 and optionally a filter 19 in order to draw water from the tank and to feed it to the combustion chamber 9 or the combustion chambers 9.
  • the water pump 17 is connected on the pressure side to a metering valve 20 which can be actuated by a control unit 21.
  • the metering valve 20 is arranged in a water line 22 which leads from the water pump 17 to the high pressure pump 14.
  • the water from the tank 16 supplied by the water pump through the metering valve 20 to the high-pressure pump 14 is thus injected together with the fuel through the respective injection valve 12 into the respective combustion chamber 9, so that the combustion temperature is reduced and thus the knock tendency is reduced and the exhaust gas temperatures are also reduced ,
  • the tank 16 the
  • Water pump 17, metering valve 20 and high pressure pump 14 together with injection valve 12 thus form an advantageous water injection system 23 of cooling system 2 or internal combustion engine 1.
  • a bypass line 22 'leads away from the water line 22 upstream of the metering valve 20 and is fed to a water injection valve 24, by means of which the water can be injected into the inlet channel 7 upstream of the cylinder 3, in particular downstream of a throttle valve 25.
  • the cooling system 2 also has an advantageous sensor device 26, by means of which the pressure of the water in the water line 22 upstream of the metering valve 20 and downstream of the metering valve 20 can be detected.
  • the sensor device 26 has a first pressure sensor 27, which is arranged between the water pump 17 and the metering valve 20 in the water line 22, and a second one Pressure sensor 28 which is arranged between metering valve 20 and high pressure pump 14.
  • the sensors 27, 28 are also connected to the control unit 21 for signaling purposes. Depending on the detected pressure values of the pressure sensors 27 and 28, the pressure delivered by the metering valve 20 is increased
  • the control unit 21 compares the pressure values and the resulting amount of water with the desired amount of water and influences or varies the control of the metering valve 20 accordingly in order to optimally cool the internal combustion engine 1
  • FIG. 2 shows a second exemplary embodiment of the cooling system 1 in a simplified representation, elements which are already known from FIG. 1 being provided with the same reference numerals and in this respect reference is made to the above description. Essentially, only the differences will be discussed below.
  • the sensor device 26 has a differential pressure sensor 29, which is connected upstream and downstream of the metering valve 20 to the water line 22, in order to depend on the detected differential pressure, which results from the pressure ratio before and after the metering valve 20 results in monitoring the amount of water delivered by the metering valve 20.
  • the differential pressure sensor 29 monitors the pressure curve before and after the metering valve 20 and can thus determine the amount of water that is introduced into the high-pressure pump 14 as a function of the opening period.
  • Fuel system is determined by means of a fuel pressure sensor, not shown here, so that the precise determination of the metered amount of water Possible mechanical tolerances or tolerances from the opening behavior of the metering valve 20 can be adapted and compensated.
  • the pressure curves before and after the metering valve can be used to diagnose this component.
  • the control times are from the
  • Control device 21 is known so that implausible delay times, a permanently closed or a permanently open metering valve 20 can be easily recognized from the pressure profiles. This provides a particularly robust cooling system 2 for direct water injection.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

L'invention concerne un système de refroidissement (2) pour un moteur à combustion interne (1), en particulier d'un véhicule à moteur. Le système est pourvu d'au moins un injecteur (12) de carburant associé au moteur à combustion interne (1), d'au moins une pompe haute pression (14) située en amont de l'injecteur (12) de carburant et destinée à refouler le carburant vers l'injecteur (12) de carburant et d'un dispositif d'injection d'eau (23), qui présente une soupape de dosage (20) située en amont de la pompe haute pression (14) pour le dosage d'eau dans le carburant. Selon l'invention, un dispositif de détection (26) destiné à détecter la pression d'eau en amont et en aval de la soupape de dosage (20) est associé à la soupape de dosage (20), afin de déterminer une quantité d'eau transportée par la soupape de dosage (20).
PCT/EP2019/063730 2018-06-20 2019-05-28 Système de refroidissement pour un moteur à combustion interne, procédé pour le faire fonctionner Ceased WO2019243003A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018209984.7A DE102018209984A1 (de) 2018-06-20 2018-06-20 Kühlsystem für eine Brennkraftmaschine, Verfahren zum Betreiben
DE102018209984.7 2018-06-20

Publications (1)

Publication Number Publication Date
WO2019243003A1 true WO2019243003A1 (fr) 2019-12-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/063730 Ceased WO2019243003A1 (fr) 2018-06-20 2019-05-28 Système de refroidissement pour un moteur à combustion interne, procédé pour le faire fonctionner

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DE (1) DE102018209984A1 (fr)
WO (1) WO2019243003A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020208052A1 (de) 2020-06-29 2021-12-30 Robert Bosch Gesellschaft mit beschränkter Haftung Verfahren zum Kalibrieren eines Kraftstoffdrucksensors in einem Kraftstoffversorgungsystem einer Brennkraftmaschine
DE102020208051A1 (de) 2020-06-29 2021-12-30 Robert Bosch Gesellschaft mit beschränkter Haftung Verfahren zum Kühlen einer Brennkraftmaschine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2789839A2 (fr) * 2013-04-08 2014-10-15 Bayerische Motoren Werke Aktiengesellschaft Système et procédé d'injection d'eau pour un moteur à combustion interne
EP3029301A1 (fr) * 2014-11-04 2016-06-08 Bayerische Motoren Werke Aktiengesellschaft Procede et systeme de fonctionnement d'au moins une unite fonctionnelle d'un vehicule automobile
DE102016000761A1 (de) * 2016-01-27 2017-07-27 Roman TANIEL Emulgiersystem und Emulgierverfahren

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2789839A2 (fr) * 2013-04-08 2014-10-15 Bayerische Motoren Werke Aktiengesellschaft Système et procédé d'injection d'eau pour un moteur à combustion interne
EP3029301A1 (fr) * 2014-11-04 2016-06-08 Bayerische Motoren Werke Aktiengesellschaft Procede et systeme de fonctionnement d'au moins une unite fonctionnelle d'un vehicule automobile
DE102016000761A1 (de) * 2016-01-27 2017-07-27 Roman TANIEL Emulgiersystem und Emulgierverfahren

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