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
  • 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
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D41/00—Electrical control of supply of combustible mixture or its constituents
  • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
• • 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
  • F02M25/0221—Details of the water supply system, e.g. pumps or arrangement of valves
• • 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
  • F02M25/025—Adding water
• • 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
  • F02M25/025—Adding water
  • F02M25/028—Adding water into the charge intakes
• • 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
  • F02M25/025—Adding water
  • F02M25/03—Adding water into the cylinder or the pre-combustion chamber
• • 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
  • F02D41/20—Output circuits, e.g. for controlling currents in command coils
  • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
  • F02D2041/2058—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using information of the actual current value

Definitions

• the present invention relates to a device for injecting water of an internal combustion engine and such an internal combustion engine. Another aspect of the invention relates to a method of operating such a device.
• the pump used to convey the water is switched off. This means that during this time, the water is in the injectors and the lines of the water injection system. Due to the high temperatures of the parts of the internal combustion engine in the vicinity of the water injection system, the standing water can heat up to vapor formation. This effect is exacerbated when driving at high altitude, where the air pressure is lower. The formation of steam prevents rapid pressure build-up when the pump is switched on again fast operational readiness of water injection. This can be too
• Internal combustion engine with the features of claim 1 has the advantage over that the operational readiness of the water injection device can be determined quickly and inexpensively. This is inventively achieved by detecting a current consumption of a drive of the conveying element, since the current consumption is related to the torque of the electric drive of the conveying element and thus dependent on
• a water tank for storing water
• a conveying element for conveying the water
• the conveying element is connected to the water tank
• at least one water injector for injecting water, which is connected to the conveying element
• a drive for driving the conveying element
• a control unit which is arranged to detect a current consumption of the drive in order to determine a system pressure in a line region between the conveying element and the water injector.
• the release of the injection can take place at the earliest possible date and / or measures can be taken to prevent further vapor formation and to initiate a condensation of the vapor. Furthermore, in the invention according to the invention can be dispensed with an additional pressure sensor.
• the drive is a DC motor or brushless
• DC motor trained As a DC motor or commutator is a rotating electric machine to understand, which is operated with DC.
• As a brushless DC motor is the engine to understand, which contrary to its naming not on the operating principle of a
• DC machine is based, but how a three-phase synchronous machine with excitation by permanent magnets is constructed.
• control unit may preferably be set up to provide a phase current of at least one coil of the brushless one
• control unit is set up, a phase current of all coils of the brushless
• control unit is advantageously set up
• the first predefined current value may be pre-stored in the control unit and corresponds to the situation in which the delivery element has built up a pressure required to inject water.
• control unit is configured to determine a vapor formation when the conveyor element is switched on when the current consumption of the drive is equal to or less than a second predefined current value.
• the second predefined current value can be pre-stored in the control unit and corresponds to the situation in which the conveying element due to
• the first predefined current value and the second predefined current value are the same.
• control unit is preferably set up to control combustion of the internal combustion engine so that further vapor formation is reduced in order to allow the fastest possible pressure build-up by the conveying element.
• control unit can be set up to operate the conveying element and the water injector in such a way that the steam in the line region between the conveying element and the water injector is removed by the water injector.
• control unit may preferably be configured to carry out one or more targeted, non-combustion-relevant water injections. As a result, the temperature in the line region between the conveying element and the water injector can be reduced, which leads to a further development of steam ceasing.
• the control unit may preferably have an external conveyor element control unit. Alternatively or additionally, a
• Engine control unit serve as the control unit according to the invention.
• Another aspect of the invention relates to an internal combustion engine comprising a device according to the invention for injecting water.
• a device according to the invention for injecting water.
• the internal combustion engine is set up to be operated with gasoline and according to the Otto principle.
• the internal combustion engine is to be understood, in which combustion takes place by means of spark ignition in the form of a spark plug.
• spark ignition in the form of a spark plug.
• the ignition is exactly predetermined by the spark ignition.
• Water injection or the ignition timing can be selected so that an optimal combustion takes place. As a result, temperature peaks in the exhaust gas and knocking events in the combustion can be avoided.
• the present invention relates to a method for operating a device for injecting water, which at least one
• a water injector a conveying element for conveying water and a drive for driving the conveying element, wherein a current consumption of the drive is detected to determine a system pressure in a line region between the conveying element and the water injector.
• a phase current of at least one coil of a brushless DC motor is detected to determine the system pressure.
• the water injector is opened according to the invention for injecting water when the current consumption is equal to or greater than a first predefined
• vapor formation is determined when the current consumption of the drive is equal to or less than a second predefined current value.
• a combustion of the internal combustion engine is controlled so that a further formation of steam is reduced to a
• Figure 1 is a greatly simplified schematic view of a
• Figure 2 is a simplified schematic view of the device for
• Figure 3 is a diagram in which a time course of
• FIGS. 1 to 3 an apparatus 1 for injecting water of an internal combustion engine 2 according to a preferred embodiment of the present invention will be described in detail described.
• the internal combustion engine 2 is operated according to the Otto principle and with gasoline direct injection.
• FIG. 1 the internal combustion engine 2 is shown schematically, which has a plurality of cylinders, and a part of the invention
• the internal combustion engine 2 comprises per cylinder a combustion chamber 20 in which a piston 21 is movable back and forth. Furthermore, the internal combustion engine 2 preferably has two inlet valves 25 per cylinder, each having an inlet channel 22, via which air is supplied to the combustion chamber 20. Exhaust gas is removed via an exhaust duct 23. This is on
• Exhaust duct 23 an outlet valve 26 is arranged.
• the reference numeral 24 also designates a fuel injection valve.
• a water injector 6 is further arranged, which via a control unit 10 water in the inlet channel 22 of the
• Internal combustion engine 2 injects.
• two water injectors 6 per cylinder are provided, which can be injected for better treatment or to increase the maximum per combustion cycle
• Amount of water leads.
• a water injector per cylinder may be arranged.
• the water injection device 1 comprises a conveying element 3 designed in the form of a pump and an electric drive 4 for driving the pump.
• a water tank 5 is provided, which is connected by a first line 7 with the conveying element 3.
• a second line 8 connects the conveying element 3 with a distributor 9 or a rail, to which a plurality of water injectors 6 is connected. The second line 8 with the
• Distributor 9 corresponds to the line area between the conveying element 3 and the water injectors 6.
• an air conditioner is preferably used, including the Inventive device 1 for injection of water a supply line
• deionized water can be conveyed into the water tank 5 via a refill line 12.
• a refill line 12 In the refill line
• a pre-filter 16 in the first conduit 7 and a fine filter 17 in the second conduit 8 are arranged.
• the pre-filter 16 and the fine filter 17 are optionally heated.
• a pre-filter 16 in the first conduit 7 and a fine filter 17 in the second conduit 8 are arranged.
• the pre-filter 16 and the fine filter 17 are optionally heated.
• Water level and / or temperature sensor 18 is provided for the water in the water tank 5, which is controllable via the control unit 10.
• the control unit 10 is formed as an external conveyor element control unit. Alternatively or additionally, the control unit 10 a
• the control unit 10 is set up to detect a current consumption of the drive 4.
• the electric drive 4 is designed as a brushless DC motor with a plurality of coils. In this case, a phase current of the coils of the brushless DC motor is detected.
• Water injectors 6 are opened to inject water when a
• Measure is, for example, a reduction in the performance of
• control unit 10 may be configured to control the conveying element 3 and the water injectors 6 in order to control the flow in the
• Line region 8 between the conveyor element 3 and the water injectors 6 existing steam to remove. Furthermore, one or more, for combustion not relevant, water injections take place, whereby the line region 8 between the conveyor element 3 and the water injectors 6 is cooled. Thus, a pressure build-up by the conveying element 3 can be made possible as quickly as possible.
• FIG 3 shows a diagram in which a time course t in seconds, t (s), a detected system pressure P (Pa) in the second line 8 at the distributor 9 and a time profile of the current consumption l (A) of the drive 4 according to the preferred embodiment are shown.
• the time profile of the current consumption, which has fluctuations, is denoted by the reference numeral 15 and the time profile of the detected system pressure by the reference numeral 16. Both parameters each have a first region I and a second region II.
• the x-axis denotes the time t in s and the y-axis the current I in A and the detected pressure P x 10 5 in Pa.
• the first region I designates the case in which vapor formation is present in the line region 8 between the conveying element 3 and the water injectors 6.
• the second region II the case in which in the second line 8 and the manifold 9 pressure is already built up by the conveying element 3.
• Measures are taken, by which further vapor formation can be reduced or eliminated. Thereafter, a combustion-related water injection may occur at an earliest possible time when the sensed current is greater than the average value 1 5 ". Instead of using the averages 15 'and 1 5", vapor formation in the water may occur
• Line region 8 between the conveyor element 3 and the water injectors 6 are determined based on a maximum current value of the region I.
• the mean values 1 5 'and 15 "and the maximum current value of the region I are pre-stored in the control unit.
• the device 1 according to the invention for the injection of water offers the advantage of a quick exchange of their operational readiness and the release of the injection at the required system pressure. Furthermore, a delayed pressure buildup can be quickly detected when steaming. For this purpose, additional components, such as e.g. to be dispensed with a pressure sensor, resulting in a more cost-effective and compact design of the device 1 according to the invention.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Health & Medical Sciences (AREA)
• Public Health (AREA)
• Water Supply & Treatment (AREA)
• Output Control And Ontrol Of Special Type Engine (AREA)

Applications Claiming Priority (3)

Publications (1)

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Family Applications (1)

Country Status (3)

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• 2016
  • 2016-04-13 EP EP16717328.5A patent/EP3292295A1/de active Pending
  • 2016-04-13 WO PCT/EP2016/058072 patent/WO2016177543A1/de active Application Filing
  • 2016-04-13 CN CN201680026281.5A patent/CN107567539B/zh active Active

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