EP3894684A1 - Verfahren zum erwärmen des flüssigkeitskühlmittels eines verbrennungsmotors nach einem kaltstart - Google Patents

Verfahren zum erwärmen des flüssigkeitskühlmittels eines verbrennungsmotors nach einem kaltstart

Info

Publication number
EP3894684A1
EP3894684A1 EP19823803.2A EP19823803A EP3894684A1 EP 3894684 A1 EP3894684 A1 EP 3894684A1 EP 19823803 A EP19823803 A EP 19823803A EP 3894684 A1 EP3894684 A1 EP 3894684A1
Authority
EP
European Patent Office
Prior art keywords
temperature
engine
coolant
oil
starting
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.)
Granted
Application number
EP19823803.2A
Other languages
English (en)
French (fr)
Other versions
EP3894684B1 (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
Original Assignee
PSA Automobiles SA
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 PSA Automobiles SA filed Critical PSA Automobiles SA
Publication of EP3894684A1 publication Critical patent/EP3894684A1/de
Application granted granted Critical
Publication of EP3894684B1 publication Critical patent/EP3894684B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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

  • TITLE METHOD FOR HEATING THE COOLANT OF AN INTERNAL COMBUSTION ENGINE AFTER A COLD START
  • the invention relates, in general, to the field of control laws for electronic control units, designated ECUs “for Electronic Control Units” in English, for the starting of an internal combustion engine, in particular mounted within 'a motor vehicle.
  • the invention relates more particularly to a method of heating the coolant of an engine after a cold start.
  • the additional boiler heats the branch of the water circuit going to the air heater, thus making it possible to immediately heat the passenger compartment, defrost the windows and preheat the engine of the vehicle before it starts.
  • the additional boiler operates independently of the engine, but it is supplied by the vehicle's electrical circuit and by the engine's fuel circuit.
  • the air heater is an autonomous device used to heat a specific space, such as the passenger compartment of a vehicle. It consists of a heat exchanger fitted 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 heat exchanger of the air heater 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 independent 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 vehicle engine are therefore heated.
  • a time limited to a reduced time of the use of the additional boiler produces an increase in the temperature of the coolant, designated water temperature, but not in the temperature of the engine oil, designated temperature the oil, which fails to rise sufficiently.
  • the engine oil is heated only 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 period of use of the additional boiler therefore limits the heating of the engine oil.
  • the control laws stored by the electronic control unit for vehicle engines draw up maps for the starting phase of the vehicle engine as a function of the engine speed and of the water temperature, without taking account of the oil temperature.
  • an insufficient temperature of the engine oil leads to losses in terms of friction in the engine, causing stalling and operating problems 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 stalling after starting the engine. In fact, the speed at which the transition takes place between the start-up phase and the post-start-up phase 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 of 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 motorization system, an electronic control unit executing the control method of the motorization system to control the starting of the engine, and an oil circuit, said control method comprising: measuring the temperature of the coolant and the measurement of the engine oil temperature, comparison of the temperature difference between the coolant temperature and the engine oil temperature against a temperature threshold that can be calibrated according to engine friction losses, if after starting the engine system the temperature difference between the coolant temperature and the oil temperature of the engine is greater than said calibrable temperature threshold, the implementation of a control law comprising an engine speed reference vector determining the starting output which is a function of the oil temperature, and if after starting the system motorization the temperature difference between the temperature of the coolant and the temperature of the engine oil is less than said calibrated temperature threshold, the implementation of a control law comprising a determining engine speed setpoint vector the start output
  • a control law determines an initialization vector of torque setpoint which is a function of the engine oil temperature, and if after starting the engine system the temperature difference between the temperature of the coolant and the oil temperature is less than said calibrated 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 participate in the control of the effective torque produced by the motor in the memory of the electronic control unit.
  • the method comprises carrying out a mapping of the temperatures and of the engine speed, in order to determine the temperature threshold which 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 engine oil temperature above said calibrable 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 engine oil temperature below said calibrable 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 of 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.
  • FIG. 1 schematically illustrates the detection of the temperature difference between the temperature of the coolant and the temperature of the engine oil, just after the engine start-up phase
  • FIG. 2 schematically illustrates the application of the engine speed setpoint vector determining the starting output
  • FIG. 3 schematically illustrates the application of the torque setpoint initialization vector.
  • 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.
  • FIG. 1 represents a diagram of the detection of the temperature difference between the temperature of the coolant 1 and the temperature of the engine oil 2, at the instant after starting of the engine, that is to say at the time of the transition between the starting phase and the post-starting phase of 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 takes place between the start-up phase and the post-start-up phase is generally mapped by a table indexed in water temperature.
  • this indexing according to the water temperature is unsuitable in the case of the use of an additional boiler for a short period because the temperature of the water is high while that of the oil does not is not.
  • the water temperature is not a parameter which takes into account the actual friction losses of the engine, unlike the oil temperature.
  • 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 generates an under-speed of the engine, the regulator idling struggling to restore engine speed to its setpoint. The friction losses are therefore reflected in the engine by driving under speed and engine stalling.
  • FIG. 1 represents a diagram for detecting the temperature difference between the temperature of the coolant 1 and the temperature of the engine oil 2.
  • a calibrable temperature threshold 3 When the engine starts 4, and that the difference between the temperature of the coolant cooling 1 and the engine oil temperature 2 is higher than a calibrable temperature threshold 3, then the critical situation likely to generate an engine stall or driving under speed is identified, the two conditions mentioned must necessarily be 5.
  • a specific SITUATION_DE_VIE_CRITIQUE 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 text indicating that the SITUATION_DE_VIE_CRITIQUE code is TRUE 8.
  • FIG. 2 represents a diagram of application 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 calibrable temperature threshold 3, then the critical situation likely to generate an engine stall or driving under-speed is identified, these two conditions must necessarily be met.
  • a specific SITUATION_DE_VIE_CRITIQUE 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 speed to the engine torque structure 11 is produced from a table indexed as a function of the oil temperature of the engine 2, making it possible to obtain a target vector of the engine speed determining the output of start depending on 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 speed to the engine torque structure 11 is produced from a table indexed as a function of the temperature of the coolant 1, a vector of engine speed setpoint determining the starting output as a function of the coolant temperature 12.
  • FIG. 3 represents a diagram of application 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 liquid temperature of cooling 1 and the engine oil temperature 2 has exceeded the calibrable temperature threshold 3.
  • the initialization torque of all the elements which participate in the control of the effective torque produced by the engine 14 is then produced from a table indexed as a function of the oil temperature of the engine 2, in order to obtain a torque setting initialization vector as a function of the oil temperature 13.
  • the initialization torque of all the elements which participate in the control of the effective torque produced by the engine 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 for initializing the torque setpoint 15.
  • the method according to the invention therefore makes it possible to avoid stalling of the engine only by means of the vehicle control laws and without the addition of 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.

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)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
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 true EP3894684A1 (de) 2021-10-20
EP3894684B1 EP3894684B1 (de) 2023-01-18

Family

ID=66690487

Family Applications (1)

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

Country Status (3)

Country Link
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

Also Published As

Publication number Publication date
FR3089563B1 (fr) 2020-11-13
EP3894684B1 (de) 2023-01-18
WO2020120852A1 (fr) 2020-06-18
FR3089563A1 (fr) 2020-06-12

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