EP3581788A1 - Verfahren und system zum abschätzen der temperatur der vorglühkerzen eines verbrennungsmotors - Google Patents

Verfahren und system zum abschätzen der temperatur der vorglühkerzen eines verbrennungsmotors Download PDF

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Publication number
EP3581788A1
EP3581788A1 EP19179345.4A EP19179345A EP3581788A1 EP 3581788 A1 EP3581788 A1 EP 3581788A1 EP 19179345 A EP19179345 A EP 19179345A EP 3581788 A1 EP3581788 A1 EP 3581788A1
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EP
European Patent Office
Prior art keywords
temperature
cylinder
ivc
engine
angle
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Granted
Application number
EP19179345.4A
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English (en)
French (fr)
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EP3581788B1 (de
Inventor
Cédric LEFEVRE
Xavier DELAYE
Benoit Verbeke
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Renault SAS
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Renault SAS
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    • 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
    • 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
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/0065—Specific aspects of external EGR control
    • F02D2041/0067—Determining the EGR 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
    • F02D2200/021—Engine temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
    • F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
    • F02D35/025—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining temperatures inside the cylinder, e.g. combustion temperatures
    • F02D35/026—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining temperatures inside the cylinder, e.g. combustion temperatures using an estimation
    • 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
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/0065—Specific aspects of external EGR control
    • F02D41/0072—Estimating, calculating or determining the EGR rate, amount or flow
    • 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
    • F02D41/009—Electrical control of supply of combustible mixture or its constituents using means for generating position or synchronisation signals
    • 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
    • F02D41/18—Circuit arrangements for generating control signals by measuring intake air flow
    • 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

Definitions

  • the present invention relates to the field of glow plugs for internal combustion engines, in particular diesel type engines.
  • the present invention relates to the field of estimating the temperature of such glow plugs.
  • the temperature of the air-fuel mixture In order to start a Diesel engine when the outside temperature is below a threshold value, the temperature of the air-fuel mixture must be brought to a certain temperature to improve the auto-ignition of the mixture. Glow plugs are used for this, located in the combustion chamber of the engine and controlled via a glow box.
  • the coefficient of exchange by convection ho is likely to be variable with the pressure and the speed of the gases in the combustion chamber (Nusselt and Planck number). This coefficient may depend on the gas flow admitted by the engine.
  • the temperature of the gases internal to the combustion chamber T gas is not measured and is difficult to estimate precisely. It can be approximated to an average temperature, either fixed corresponding to the equilibrium temperature of the spark plug, for example during measurements on test benches, or characterized by maps integrated into the computer.
  • the temperature of the gases internal to the combustion chamber T gas depends in particular on the engine operating point, the temperature of the admitted gases, the gas flow rate passing through the engine, the combustion adjustment, etc.
  • the object of the present invention is therefore to allow an accurate and robust estimation of the temperature of the glow plugs and thus make it possible to make the best use of the potential of said glow plugs for efficiently heating the combustion chamber and improving engine starting, as well as engine stability after starting.
  • the subject of the invention is a method for estimating the temperature of the pencil of glow plugs installed in a combustion chamber of an internal combustion engine, in particular of the Diesel type, comprising at least one cylinder pressure sensor, in which by measuring the cylinder pressure, for each crankshaft position, for example all degrees of crankshaft 1 ° crk , by knowing the spark plug piloting voltage, by initializing the spark plug temperature at the first cold engine calculation step, at the cylinder head temperature, that is to say at the coolant temperature, or at the previous temperature in the event of a hot start, an average temperature value in the cylinder is estimated over a combustion cycle and by iterative calculations, the temperature of the spark plug pencil is estimated.
  • the temperature of the glow plugs rods is precisely estimated, using only the physical and geometric parameters of the engine.
  • a temperature value in the cylinder is calculated for each angular position of the engine as a function of a value of the temperature at the closing of the intake valves, a value of the volume of the combustion chamber at the closing of the valves d (calculated on the basis of the crankshaft angle, the stroke, the bore and the dead volume of the cylinder, a volume value of the combustion chamber, for each angular position of the cylinder, a cylinder pressure value) at the closing of the intake valves, measured by a cylinder sensor and a cylinder pressure value, for each angular position of the cylinder, measured by the cylinder sensor.
  • the temperature at the closing of the intake valves is calculated by assimilating this phase to a polytropic, as a function of a temperature value at the opening of the valves. intake calculated as a function of the temperature, the exhaust gas recirculation temperature and the fresh air and recirculated gas flow rates measured by sensors, the volume of the combustion chamber at the time (ivo (valve opening intake), ivc (closing the intake valves), evo (opening the exhaust valves) and evc (closing the exhaust valves), and a polytropic coefficient of compression depending on the gas composition allowed (EGR exhaust gas recirculation rate).
  • the temperature at the opening of the intake valves can be measured by a sensor.
  • an estimate is made of the average temperature of the gases in the cylinder to which the spark plug pencil is subjected during an engine cycle as a function of the temperature value in the cylinder for each angular position of the engine calculated.
  • the estimate of the average gas temperature is, for example, calculated as a function of, the angular opening time of the intake valves, the angular duration of all closed valves, the angular opening time of the exhaust valves, the average temperature in the cylinder during the intake and expansion phases assimilated to the average temperature [T ivo ; T ivc ]; [T evo ; T evc ] and the temperature at the closing of the exhaust valves.
  • the temperature at closing of the exhaust valves is calculated by assimilating this phase to a polytropic according to a polytropic coefficient of expansion, depending on the composition of the exhaust gases (richness), and the temperature at the opening of the exhaust valves.
  • an estimate of the temperature of the spark plug rod is calculated as a function of the average temperature of the gases over a combustion cycle, this temperature being calculated from the values of temperature in the cylinder for each angular position of the engine, these values being calculated thanks in particular to the measurements of the cylinder pressure sensor.
  • the calculation of the estimate of the temperature of the pencil of the glow plug is robust at the engine operating point (speed and torque, or speed and quantity of fuel injected), at ambient temperature or pressure. , at the flow admitted by the engine and at the combustion settings.
  • the invention relates to a system for estimating the temperature of the pencil of the glow plugs installed in a combustion chamber of an internal combustion engine, in particular of the Diesel type, comprising at least one pressure sensor.
  • cylinder in which as a function of the cylinder pressure measured by the sensor, for each crankshaft position, for example all degrees of crankshaft 1 ° crk, knowing the piloting voltage of the spark plug, by initializing the temperature of the spark plug at the first no calculation of the cold engine, at the cylinder head temperature, i.e. at the coolant temperature, or at the previous temperature in the event of a hot start.
  • the system includes a module for estimating an average temperature value in the cylinder over a combustion cycle and by iterative calculations, and a module for estimating the temperature of the spark plug pencil.
  • the temperature of the glow plugs rods is precisely estimated, using only the physical and geometric parameters of the engine.
  • the system comprises a module for calculating a temperature value in the cylinder for each angular position of the engine for which the intake and exhaust valves are closed, as a function of a value of the temperature on closing. of the intake valves, a volume value of the combustion chamber at the closing of the intake valves, calculated as a function of the crankshaft angle, the stroke, the bore and the dead volume of the cylinder, a volume value of the combustion chamber, for each angular position of the cylinder, a cylinder pressure value at the closing of the intake valves, measured by a cylinder sensor and a cylinder pressure value, for each angular position of the cylinder, measured by the sensor cylinder.
  • the temperature at the closing of the intake valves is calculated by assimilating this phase to a polytropic, as a function of a temperature value at the opening of the intake valves calculated as a function of the temperature, of the recirculation temperature of the exhaust gas and fresh air and recirculated gas flows measured by sensors, the volume of the combustion chamber at time X (ivo (opening of the intake valves), ivc (closing of the intake valves), evo (opening of the exhaust valves) and evc (closing of the exhaust valves), and a polytropic coefficient of compression depending on the composition of the admitted gases (EGR exhaust gas recirculation rate).
  • the temperature at the opening of the intake valves can be measured by a sensor.
  • the module for calculating an estimate of the average temperature of the gases in the cylinder to which the spark plug pencil is subjected during an engine cycle is, for example, configured to calculate said estimate as a function of the temperature value in the cylinder for each angular position of the engine calculated.
  • the estimate of the average gas temperature is calculated as a function of, the angular opening time of the intake valves, the angular duration of all closed valves, the angular opening time of the exhaust valves, the average temperature in the cylinder. during the intake and expansion phases assimilated to the average temperature [T ivo ; T ivc ]; [T evo ; T evc ] and the temperature at the closing of the exhaust valves.
  • the temperature at the closing of the exhaust valves is calculated by assimilating this phase to a polytropic according to a polytropic coefficient of expansion, depending on the composition of the exhaust gases (richness), and the temperature at opening. exhaust valves.
  • the module for calculating an estimate of the temperature of the spark plug pencil is configured to calculate said estimate as a function of the temperature in the cylinder for each angular position of the engine calculated and of the average temperature of the gases over a cycle of calculated combustion.
  • the calculation of the estimate of the temperature of the pencil of the glow plug is robust at the engine operating point (speed and torque, or speed and quantity of fuel injected), at ambient temperature or pressure. , at the flow admitted by the engine and at the combustion settings.
  • a system for estimating the temperature of the glow plugs, referenced 10 as a whole, is intended to be integrated into a control unit of an internal combustion engine of the Diesel type (not shown), comprising a combustion in the pistons of the engine, glow plugs located in said combustion chamber and at least one cylinder pressure sensor P.
  • the system 10 for estimating the temperature of the glow plugs further comprises a module 14 for calculating an estimate of the average temperature of the gases Tgaz in the cylinder to which the pencil of the glow plug is subjected during a cycle engine.
  • T gas cycle ⁇ ad min . T ivo + T ivc 2 + 720 - ⁇ ad min + ⁇ exh .. Avg Tcyl angle ⁇ ivc ⁇ ⁇ evo + ⁇ exh .. T evo + T evc 2
  • T gas cycle ⁇ ad min . T ivo . 1 + Flight ivo Flight ivc ⁇ ivc 2 + 1 ⁇ ivc ⁇ evo . ⁇ ⁇ ivc ⁇ evo Tcyl . d ⁇ + ⁇ exh .. Tcyl evo . 1 + Flight evo Flight evc ⁇ evc 2
  • the system 10 for estimating the temperature of the glow plugs further comprises a module 16 for calculating an estimate of the temperature of the pencil of the plug T (t) as a function of the temperature in the cylinder T cyl (angle) for each angular position of the engine calculated in equation Eq.1 and the average gas temperature Tgaz (cycle) over a combustion cycle calculated in equation Eq.7.
  • the calculation of the estimate of the temperature of the pencil of the glow plug is robust at the engine operating point (speed and torque, or speed and quantity of fuel injected), at ambient temperature or pressure. , at the flow admitted by the engine and at the combustion settings.
  • the organization chart shown in the figure 2 illustrates an example of a method 20 implemented by the system shown in the figure 1 .
  • V T is a constant between a point considered and the point of closure of the intake valves (ivc).
  • step 22 an estimate is made of the average temperature of the gases T gases in the cylinder to which the spark plug rod is subjected during an engine cycle.
  • T gas cycle ⁇ ad min . T ivo + T ivc 2 + 720 - ⁇ ad min - ⁇ exh .
  • T gas cycle ⁇ ad min . T ivo . 1 + Flight ivo Flight ivc ⁇ ivc 2 + 1 ⁇ ivc ⁇ evo . ⁇ ⁇ ivc ⁇ evo Tcyl . d ⁇ + ⁇ exh .. Tcyl evo . 1 + Flight evo Flight evc ⁇ evc 2
  • step 23 an estimate is made of the temperature of the pencil of the spark plug T (t) as a function of the temperature in the cylinder T cyl (angle) for each angular position of the engine calculated in equation Eq.1 and the average temperature of the gases T gas (cycle) over a combustion cycle calculated in equation Eq.7.
  • the calculation of the estimate of the temperature of the pencil of the glow plug is robust at the engine operating point (speed and torque, or speed and quantity of fuel injected), at ambient temperature or pressure. , at the flow admitted by the engine and at the combustion settings.

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  • 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)
EP19179345.4A 2018-06-13 2019-06-11 Steuerung von glühkerzen einer brennkraftmaschine Active EP3581788B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1855162A FR3082557B1 (fr) 2018-06-13 2018-06-13 Procede et systeme d'estimation de la temperature des bougies de prechauffage d'un moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP3581788A1 true EP3581788A1 (de) 2019-12-18
EP3581788B1 EP3581788B1 (de) 2021-03-17

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1719909A1 (de) * 2005-05-06 2006-11-08 Magneti Marelli Powertrain S.p.A. Verbrennungsmotor mit einer Glühkerze im Brennraum sowie Verfahren zum Betreiben der Glühkerze
FR2891868B1 (fr) 2005-10-07 2007-12-21 Renault Sas Procede d'estimation de la temperature d'echappement d'un moteur, et procede de diagnostic d'un capteur de pression cylindre utilisant une estimation de la temperature d'echappement.
DE102006048225A1 (de) * 2006-10-11 2008-04-17 Siemens Ag Verfahren zur Bestimmung einer Glühkerzentemperatur
US20110041785A1 (en) * 2009-08-19 2011-02-24 Gm Global Technology Operations, Inc. Glowplug temperature estimation method and device
US20110220073A1 (en) * 2010-03-11 2011-09-15 Borgwarner Beru Systems Gmbh Method for controlling a glow plug
DE102011085435A1 (de) * 2011-10-28 2013-05-02 Robert Bosch Gmbh Verfahren und Vorrichtung zur Bestimmung einer Oberflächentemperatur einer Glühstiftkerze in einem Verbrennungsmotor
US20130233272A1 (en) * 2012-03-09 2013-09-12 Borgwarner Beru Systems Gmbh Method for closed-loop control of the temperature of a glow plug
DE102012211641A1 (de) * 2012-07-04 2014-01-09 Robert Bosch Gmbh Verfahren und Vorrichtung zur Bestimmung einer Temperatur-Widerstands-Korrelation einer Glühstiftkerze

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1719909A1 (de) * 2005-05-06 2006-11-08 Magneti Marelli Powertrain S.p.A. Verbrennungsmotor mit einer Glühkerze im Brennraum sowie Verfahren zum Betreiben der Glühkerze
FR2891868B1 (fr) 2005-10-07 2007-12-21 Renault Sas Procede d'estimation de la temperature d'echappement d'un moteur, et procede de diagnostic d'un capteur de pression cylindre utilisant une estimation de la temperature d'echappement.
DE102006048225A1 (de) * 2006-10-11 2008-04-17 Siemens Ag Verfahren zur Bestimmung einer Glühkerzentemperatur
US20110041785A1 (en) * 2009-08-19 2011-02-24 Gm Global Technology Operations, Inc. Glowplug temperature estimation method and device
US20110220073A1 (en) * 2010-03-11 2011-09-15 Borgwarner Beru Systems Gmbh Method for controlling a glow plug
DE102011085435A1 (de) * 2011-10-28 2013-05-02 Robert Bosch Gmbh Verfahren und Vorrichtung zur Bestimmung einer Oberflächentemperatur einer Glühstiftkerze in einem Verbrennungsmotor
US20130233272A1 (en) * 2012-03-09 2013-09-12 Borgwarner Beru Systems Gmbh Method for closed-loop control of the temperature of a glow plug
DE102012211641A1 (de) * 2012-07-04 2014-01-09 Robert Bosch Gmbh Verfahren und Vorrichtung zur Bestimmung einer Temperatur-Widerstands-Korrelation einer Glühstiftkerze

Also Published As

Publication number Publication date
FR3082557B1 (fr) 2021-07-23
FR3082557A1 (fr) 2019-12-20
EP3581788B1 (de) 2021-03-17

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