EP3894684B1 - Verfahren zum heizen der kühlflüssigkeit einer brennkraftmaschine nach einem kaltstart - Google Patents

Verfahren zum heizen der kühlflüssigkeit einer brennkraftmaschine nach einem kaltstart Download PDF

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Publication number
EP3894684B1
EP3894684B1 EP19823803.2A EP19823803A EP3894684B1 EP 3894684 B1 EP3894684 B1 EP 3894684B1 EP 19823803 A EP19823803 A EP 19823803A EP 3894684 B1 EP3894684 B1 EP 3894684B1
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European Patent Office
Prior art keywords
temperature
engine
oil
coolant
motorization system
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EP19823803.2A
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English (en)
French (fr)
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EP3894684A1 (de
Inventor
Francois GUILCHARD
Fabrice Charlette
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.)
Stellantis Auto SAS
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PSA Automobiles SA
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Classifications

    • 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
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • 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
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/068—Introducing corrections for particular operating conditions for engine starting or warming up for warming-up
    • 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
    • F02N19/02—Aiding engine start by thermal means, e.g. using lighted wicks
    • F02N19/04—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines
    • F02N19/10—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines by heating of engine coolants
    • 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
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • F02D41/064—Introducing corrections for particular operating conditions for engine starting or warming up for starting at cold start
    • 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

Definitions

  • the invention relates, in general, to the field of control laws for electronic control units, designated ECU "for Electronic Control Unit” in English, for starting an internal combustion engine, in particular mounted within a motor vehicle.
  • the invention relates more particularly to a method for heating the coolant of an engine after a cold start.
  • the rapid heating of the passenger compartment of a vehicle is obtained thanks to the use of an additional boiler heating the coolant of the engine, in particular in winter when the temperatures are the coldest.
  • the additional boiler heats the branch of the water circuit going to the unit heater, thus making it possible to heat the passenger compartment immediately, to defrost the windows and to preheat the heat engine of the vehicle before it is started.
  • the additional boiler operates independently of the engine but is powered by the vehicle's electrical circuit and by the engine's fuel circuit.
  • the air heater is a self-contained device used to heat a specific space, such as the passenger compartment of a vehicle. It consists of a heat exchanger equipped with a fan. The heat comes from a hot water or steam network, an electric coil or a gas burner whose exhaust passes inside the exchanger. The forced air circulates outside the unit heater exchanger where it is heated. The jet of hot air produced is then directed towards the space to be heated.
  • the additional boiler therefore preheats the coolant circuit before starting the engine, the operation of this boiler being separate and autonomous from the operation of the engine.
  • the heat generated by the additional boiler is then transmitted to the interior of the vehicle by a dedicated ventilation system. The passenger compartment and the engine of the vehicle are therefore heated.
  • a duration limited to a reduced time of the use of the additional boiler produces an increase in the temperature of the coolant, designated temperature of the water, but not of the temperature of the oil of the engine, designated temperature. the oil, which fails to rise sufficiently.
  • the engine oil is heated solely by conduction with the engine block of the vehicle which is itself heated by the circulation of the coolant heated by the additional boiler. Too short a duration of use of the additional boiler therefore limits the heating of the engine oil.
  • control laws stored by the electronic control unit for vehicle engines work out maps for the starting phase of the engine of the vehicle as a function of the engine speed and the temperature of the water, without taking into account the oil temperature.
  • an insufficient temperature of the engine oil leads to losses in terms of friction in the engine causing problems of stalling and operation under engine speed.
  • the electronic control unit applies parameters that are not adapted to the friction losses of the engine, the initialization of the torque structure is then incorrect, causing stalls after engine start. Indeed, the speed from which the transition between the start-up phase and the post-start-up phase takes place is then too low compared to the friction losses actually seen by the engine.
  • the invention therefore aims to solve these drawbacks by proposing a method for heating the coolant of a motorization system of a vehicle produced just after starting the engine, by correcting the initialization of the engine torque structure during too short use of the additional boiler.
  • the present invention relates to a method for controlling a motorization system of a vehicle, in particular of a motor vehicle, the motorization system comprising a boiler for heating a coolant circuit before starting of the engine system, an electronic control unit performing the engine system control method for controlling the starting of the engine, and an oil circuit, said control method comprising: measuring the temperature of the coolant and measurement of the temperature of the engine oil, the comparison of the temperature difference between the temperature of the coolant and the temperature of the oil of the engine with respect to a temperature threshold that can be calibrated according to the engine friction losses, if after starting the engine system the temperature difference between the coolant temperature and the oil temperature of the engine is higher than said calibratable temperature threshold, the implementation of a control law comprising an engine speed setpoint vector determining the starting output which is a function of the temperature of the oil, and if after starting the system engine the temperature difference between the temperature of the coolant and the temperature of the oil of the engine is lower than said calibratable temperature threshold, the implementation of a control law comprising an
  • a control law determines an initialization vector of torque setpoint which is a function of the temperature of the engine oil, and if after starting the motorization system the temperature difference between the temperature of the cooling liquid and the temperature of the oil is lower than said calibratable temperature threshold , said method comprises the implementation of a control law comprising a torque setpoint initialization vector which is a function of the temperature of the coolant.
  • the method comprises a step of recording the value of a set of elements which take part in the control of the effective torque produced by the motor in the memory of the electronic control unit.
  • the method comprises producing a map of the temperatures and of the engine speed, to determine the temperature threshold that can be calibrated as a function of the friction losses of the engine.
  • the map is indexed according to the temperature of the engine oil.
  • the temperature difference between the temperature of the coolant and the temperature of the engine oil above said calibratable temperature threshold is determined by the generation of a code by the electronic control unit.
  • the temperature difference between the temperature of the coolant and the temperature of the engine oil below said calibratable temperature threshold is determined by the generation of a code by the electronic control unit.
  • the present invention also relates to an electronic control unit for a motorization system of a vehicle, configured to implement the method for controlling a motorization system of a vehicle as briefly described above.
  • the present invention also relates to a motor vehicle comprising such an electronic control unit.
  • the embodiments described relate more particularly to an implementation of the method for controlling a motorization system according to the invention within a motor vehicle.
  • any implementation in a different context, in particular in any type of vehicle, is also covered by the present invention.
  • the figure 1 shows a diagram of the detection of the temperature difference between the temperature of the coolant 1 and the temperature of the oil of the engine 2, at the instant following the start of the engine, that is to say at the time of the transition between the starting phase and the phase after starting the engine, during the initialization of all the elements which participate in the control of the effective torque produced by engine.
  • the regime from which the transition between the start-up phase and the post-start-up phase takes place is generally mapped by a table indexed by water temperature.
  • this indexing according to the temperature of the water is unsuitable in the case of the use of an additional boiler for a short time because the temperature of the water is high while that of the oil does not. is not.
  • the temperature of the water is not a parameter which takes into account the actual friction losses of the engine, unlike the temperature of the oil.
  • the initialization torque used to initiate the torque structure is then too low compared to the actual torque and the temperature difference between the water temperature and the oil temperature causes the engine to underspeed, the regulator idling struggling to restore the engine speed to its set point. Friction losses are therefore reflected at the engine level by under-rev driving and engine stalls.
  • the figure 1 shows a diagram of detecting the temperature difference between the temperature of the coolant 1 and the temperature of the oil of the engine 2.
  • a calibratable temperature threshold 3 When the engine starts 4, and the difference between the temperature of the coolant 1 and the oil temperature of engine 2 is higher than a calibratable temperature threshold 3, then the critical situation likely to generate engine stalling or under-rev driving is identified, the two conditions mentioned must necessarily be met 5.
  • a specific CRITICAL_LIFE_SITUATION code is created 6.
  • a message can then be displayed on a screen on board the vehicle, indicating that said critical situation has been identified. The screen then displays a wording indicating that the CRITICAL_LIFE_SITUATION code is TRUE 8. Otherwise, i.e.
  • the figure 2 represents an application diagram of the method according to the invention to the transition regime from starting to the engine torque structure, if the temperature difference between the temperature of the coolant 1 and the oil temperature of the engine 2 has exceeded the calibratable temperature threshold 3, then the critical situation liable to generate engine stalling or under-rev driving is identified, these two conditions necessarily having to be met.
  • a specific CRITICAL_LIFE_SITUATION code is created 6.
  • a message can then be displayed on a screen on board the vehicle, indicating that said critical situation has been identified.
  • the transition regime to the engine torque structure 11 is produced from a table indexed according to the temperature of the oil of the engine 2, making it possible to obtain an engine speed setpoint vector determining the output of start according to engine oil temperature 10.
  • the critical situation n is not identified 7.
  • a message can then be displayed on a screen on board the vehicle, indicating that said critical situation has not been identified.
  • the transition regime to the engine torque structure 11 is produced from a table indexed according to the temperature of the coolant 1, a vector of engine speed setpoint determining the start output as a function of the coolant temperature 12.
  • the picture 3 represents an application diagram of the method according to the invention to the initialization torque of all the elements which participate in the control of the effective torque produced by the engine, when the temperature difference between the temperature of coolant 1 and the oil temperature of engine 2 has exceeded the calibratable temperature threshold 3.
  • the initialization torque of all the elements which take part in the control of the effective torque produced by the motor 14 is then produced from a table indexed according to the temperature of the oil of the motor 2, in order to obtain a torque set point initialization vector as a function of the oil temperature 13.
  • the initialization torque of all the elements which take part in controlling the effective torque produced by the motor 14 is then produced by a table indexed as a function of the temperature of the coolant 1 and a vector is obtained as a function of the temperature of the coolant 1 of the torque setpoint initialization torque 15.
  • the method according to the invention therefore makes it possible to avoid engine stalls solely by means of the control laws of the vehicle and without adding additional parts.
  • the electronic control unit takes into account the temperature of the engine oil rather than that of the coolant after the cold start of the engine, thus making it possible to avoid losses by friction.

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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)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)

Claims (9)

  1. Verfahren zum Steuern eines Motorisierungssystems eines Fahrzeugs, insbesondere eines Kraftfahrzeugs, wobei das Motorisierungssystem einen Boiler zum Erwärmen eines Kühlflüssigkeitskreislaufs vor dem Starten des Motorisierungssystems umfasst, eine elektronische Steuereinheit, die das Motorisierungssystem-Steuerverfahren zum Steuern des Startens ausführt dem Motor und einem Ölkreislauf, dadurch gekennzeichnet, dass das Steuerverfahren umfasst:
    - die Kühlmitteltemperaturmessung (1) und die Motoröltemperaturmessung (2),
    - der Vergleich der Temperaturdifferenz zwischen der Temperatur des Kühlmittels (1) und der Temperatur des Motoröls (2) gegenüber einer kalibrierbaren Temperaturschwelle (3) entsprechend den Motorreibungsverlusten,
    - wenn nach dem Starten des Motorsystems die Temperaturdifferenz zwischen der Temperatur des Kühlmittels (1) und der Temperatur des Motoröls (2) größer als der kalibrierbare Temperaturschwellenwert (3) ist, das Setzen eines Steuergesetzes umfassend einen die Anfahrleistung (10) bestimmenden Motordrehzahl-Sollwertvektor, der von der Temperatur des Öls (2) abhängt, und
    - wenn nach dem Starten des Motorsystems die Temperaturdifferenz zwischen der Temperatur des Kühlmittels (1) und der Temperatur des Motoröls (2) niedriger als der kalibrierbare Temperaturschwellenwert (3) ist, das Setzen eines Steuergesetzes umfassend ein die von der Temperatur des Kühlmittels (1) abhängige Anfahrleistung (10) bestimmender Drehzahlsollwertvektor.
    Verfahren zum Steuern eines Motorisierungssystems eines Fahrzeugs nach Anspruch 1, dadurch gekennzeichnet
  2. wenn nach dem Starten des Motorisierungssystems die Temperaturdifferenz zwischen der Temperatur des Kühlmittels (1) und der Temperatur des Motoröls (2) niedriger als die kalibrierbare Temperaturschwelle (3) ist, bestimmt ein Regelgesetz eine Initialisierung des Drehmomentsollwerts Vektor (13), der eine Funktion der Temperatur des Motoröls (2) ist, und ob nach dem Starten des Motorisierungssystems die Temperaturdifferenz zwischen der Temperatur der Flüssigkeitskühlung (1) und der Temperatur des Öls (2) unterhalb der kalibrierbaren Temperaturschwelle (3) liegt, die Implementierung eines Steuergesetzes, das einen Drehmomentsollwert-Initialisierungsvektor (13) umfasst, der von der Temperatur des Kühlmittels (1) abhängt.
  3. Verfahren zum Steuern eines Motorisierungssystems eines Fahrzeugs nach dem vorhergehenden Anspruch, umfassend einen Schritt des Aufzeichnens des Werts einer Gruppe von Elementen, die an der Steuerung des effektiven Drehmoments beteiligt sind, das durch den Motor erzeugt wird, in dem Speicher der elektronischen Steuereinheit.
  4. Verfahren zur Steuerung eines Motorisierungssystems eines Fahrzeugs nach einem der vorhergehenden Ansprüche, umfassend die Erstellung eines Kennfelds der Temperaturen und der Motordrehzahl zur Bestimmung der kalibrierbaren Temperaturschwelle (3) in Abhängigkeit von den Verlusten durch Motorreibung .
  5. Verfahren zum Steuern eines Motorisierungssystems eines Fahrzeugs nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass das Kennfeld gemäß der Temperatur des Öls des Motors (2) indiziert wird.
  6. Verfahren zum Steuern eines Motorisierungssystems eines Fahrzeugs nach den vorhergehenden Ansprüchen, bei dem die Temperaturdifferenz zwischen der Temperatur der Kühlflüssigkeit (1) und der Temperatur des Motoröls (2) größer ist als der Schwellenwert der kalibrierbaren Temperatur ( 3) wird durch die Generierung eines Codes (8) durch das elektronische Steuergerät ermittelt.
  7. Verfahren zum Steuern eines Motorisierungssystems eines Fahrzeugs nach den vorangehenden Ansprüchen, bei dem die Temperaturdifferenz zwischen der Temperatur der Kühlflüssigkeit (1) und der Temperatur des Motoröls (2) unter dem Schwellenwert der kalibrierbaren Temperatur (3 ) wird durch die Generierung eines Codes (9) durch das elektronische Steuergerät ermittelt.
  8. Elektronisches Steuergerät für ein Motorisierungssystem eines Fahrzeugs, eingerichtet zum Ausführen des Verfahrens zum Steuern eines Motorisierungssystems eines Fahrzeugs nach einem der vorhergehenden Ansprüche.
  9. Kraftfahrzeug mit einer elektronischen Steuereinheit nach dem vorhergehenden Anspruch
EP19823803.2A 2018-12-10 2019-11-19 Verfahren zum heizen der kühlflüssigkeit einer brennkraftmaschine nach einem kaltstart Active EP3894684B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1872575A FR3089563B1 (fr) 2018-12-10 2018-12-10 Procede de chauffage du liquide de refroidissement d’un moteur a combustion interne apres un demarrage a froid
PCT/FR2019/052755 WO2020120852A1 (fr) 2018-12-10 2019-11-19 Procede de chauffage du liquide de refroidissement d'un moteur a combustion interne apres un demarrage a froid

Publications (2)

Publication Number Publication Date
EP3894684A1 EP3894684A1 (de) 2021-10-20
EP3894684B1 true EP3894684B1 (de) 2023-01-18

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EP19823803.2A Active EP3894684B1 (de) 2018-12-10 2019-11-19 Verfahren zum heizen der kühlflüssigkeit einer brennkraftmaschine nach einem kaltstart

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EP (1) EP3894684B1 (de)
FR (1) FR3089563B1 (de)
WO (1) WO2020120852A1 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7277791B2 (en) * 2005-10-19 2007-10-02 International Engine Intellectual Property Company, Llc Strategy for detecting use of a block heater and for modifying temperature-dependent variables to account for its use
JP4897715B2 (ja) * 2008-01-28 2012-03-14 ヤンマー株式会社 ディーゼルエンジンの制御装置
DE102008015283B3 (de) 2008-03-20 2009-09-03 Continental Automotive Gmbh Verfahren und Steuervorrichtung zum Starten einer Brennkraftmaschine, welche eine Heizeinrichtung zum Erhitzen einer Kühlflüssigkeit aufweist
FR3048737B1 (fr) * 2016-03-08 2018-03-16 Peugeot Citroen Automobiles Sa Procede de commande des bougies de prechauffage d’un moteur

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FR3089563A1 (fr) 2020-06-12
WO2020120852A1 (fr) 2020-06-18
FR3089563B1 (fr) 2020-11-13
EP3894684A1 (de) 2021-10-20

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