Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
  • F02P19/00—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition
  • F02P19/02—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs
  • F02P19/021—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs characterised by power delivery controls
  • F02P19/023—Individual control of the glow plugs
• • 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
  • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
  • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
  • F02D41/2425—Particular ways of programming the data
  • F02D41/2429—Methods of calibrating or learning
  • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
  • F02D41/2464—Characteristics of actuators
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
  • F02P19/00—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition
  • F02P19/02—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs
  • F02P19/021—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs characterised by power delivery controls
  • F02P19/022—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs characterised by power delivery controls using intermittent current supply
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
  • F02P19/00—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition
  • F02P19/02—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs
  • F02P19/025—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs with means for determining glow plug temperature or glow plug resistance
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23Q—IGNITION; EXTINGUISHING-DEVICES
  • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
  • F23Q7/001—Glowing plugs for internal-combustion engines

Definitions

• the invention relates to a method for heating a glow plug to a desired temperature by means of an annealing program, which predetermines the time course of an effective voltage generated by pulse width modulation, which is applied to the glow plug for heating.
• Modern glow plug control units are equipped with a library of different annealing programs, each optimized for a particular type of glow plug, ie a specific series.
• a glow plug control device for glow plugs of different series of construction can be used and still be tailored to the glow requirements of the engine and the performance of the respective glow plug annealing operation can be realized.
• Efficient glow plug control can optimize the combustion performance of a motor and increase the life of a glow plug.
• the object of the present invention is to show a way in which glow plugs can be controlled even more efficiently.
• the properties of glow plugs in a series of construction differ within the scope of manufacturing tolerances. Therefore, the glow programs stored in the conventional control units take into account both glow plugs in the upper and in the lower tolerance range. This variation of the characteristics of glow plugs in the context of manufacturing tolerances prevents in conventional controls optimum adaptation of the glow plug operation to the requirements of the engine or the performance of the glow plugs. By determining the position of a given glow plug within the manufacturing tolerance range and taken into account in the control, the heating of a glow plug can be optimized. This is especially true for ceramic glow plugs, where tight manufacturing tolerances can be maintained only with great effort. Therefore, according to the invention, a deviation of a value of a characteristic of a glow plug from a nominal value typical for the series of construction is determined, and the annealing program is adjusted as a function of the deviation.
• a glow plug can be heated to a desired target temperature with greater accuracy.
• the influence of production-related tolerances, such as the scattering of the cold resistance, on the candle temperature can therefore be reduced.
• the operation of a glow plug can therefore be adapted even better to the requirements of an engine. This has an advantageous effect on the cold running and emission behavior of the engine.
• the parameter whose deviation is determined by a nominal value typical for the series of construction is preferably an electrical parameter. Suitable examples are the electrical resistance, capacitance or inductance. The used However, the characteristic does not necessarily have to be an electrical variable. For example, the heat capacity of the glow tip can be used as a parameter.
• the electrical parameter can be, for example, the electrical resistance of the glow plug at a predetermined reference temperature.
• the temperature of a glow plug matches the temperature of the cooling water.
• Temperature sensors for measuring the temperature of the cooling water are generally present in motor vehicles anyway, so that the cooling water temperature can be made available to a glow plug control device without additional additional expenditure.
• the cooling water temperature can be used as a reference temperature before heating a glow plug and the electrical resistance of the cold glow plug with the nominal value of the electrical resistance of a glow plug of this series at the relevant temperature are compared.
• the deviation of which is determined by a nominal value typical for the construction series
• a change in resistance occurring when the glow plug is heated up is used for this purpose.
• a resistance measurement can be carried out in each case at the beginning and at the end of a current pulse.
• this measurement can be supplemented by a measurement at the end of the pulse.
• the deviation of the value of the electrical quantity from the nominal value may be based on the adaptation of the annealing program as absolute deviation or as relative deviation.
• the deviation of the parameter from the nominal value is preferably determined as a relative deviation, and in the annealing program the respective value of the effective voltage is changed proportionally to the relative deviation. If, for example, it is determined that the electrical cold resistance of the glow plug is one percent greater than the nominal value, the value of the RMS voltage can be increased by one percent.
• the power relevant to the heating of the glow plug is quadratically dependent on the voltage, a change in the effective voltage proportional to the relative deviation is usually sufficient because the relative deviations are small.
• the value of the electrical characteristic of the glow plug can be measured by the manufacturer and stored in a data carrier attached to the glow plug.
• the value of the electrical characteristic can be on a label of the glow plug or an instruction leaflet and manually entered into the glow plug control device during assembly of the glow plug. It is also possible to store the value of the electrical parameter in a memory attached to the glow plug, which can be read by the glow plug control unit.
• the value of the electrical characteristic is determined by the glow plug control device by a measurement or provided by the manufacturer, it is preferable to store the value of the electrical characteristic of the glow plug in the glow plug control device and to use for several heating operations. Even if the parameter is measured again for each heating process, it is possible that an erroneous value of the electrical parameter is determined by an unusual operating state of the vehicle, for example, a recent engine operation. By only changing the value of the electrical characteristic in the glow plug controller memory when multiple measurements provide consecutive results, the risk of erroneous adjustment of the annealing program can be reduced.
• a glow plug control device for carrying out a method according to the invention has a switch for generating an effective voltage for application to a glow plug by pulse width modulation of a vehicle electrical system voltage of a motor vehicle, a memory in which glow programs for different series of glow plugs are stored, a control unit which in operation controls the switch operated according to one of the stored Glühprogramme, and a sensor for measuring a characteristic of a glow plug.
• the glow plug control device largely corresponds to commercially available glow plug control devices, so that a description in this regard is unnecessary.
• the glow plug control device is set up in such a way that, during operation, a production-related deviation of a value of a characteristic of the glow plug from a nominal value typical for the construction series is determined, and the glow program provided for glow plugs of this series of construction is adjusted as a function of the deviation.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Control Of Resistance Heating (AREA)
• Combined Controls Of Internal Combustion Engines (AREA)
• Ignition Installations For Internal Combustion Engines (AREA)

Applications Claiming Priority (1)

Publications (2)

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ID=43629631

Family Applications (1)

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Cited By (1)

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• 2009
  • 2009-11-28 DE DE102009056261A patent/DE102009056261B4/de not_active Expired - Fee Related
• 2010
  • 2010-10-14 EP EP10013652A patent/EP2327872A3/fr not_active Withdrawn
  • 2010-10-19 JP JP2010234502A patent/JP2011112046A/ja active Pending
  • 2010-11-08 US US12/941,906 patent/US20110130946A1/en not_active Abandoned
  • 2010-11-25 KR KR1020100117819A patent/KR101705104B1/ko active Active

Non-Patent Citations (1)

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