EP1405992A1 - Regelsystem zur Regelung eines Kühlungssystems einer Brennkraftmaschine eines Kraftfahrzeugs - Google Patents

Regelsystem zur Regelung eines Kühlungssystems einer Brennkraftmaschine eines Kraftfahrzeugs Download PDF

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Publication number
EP1405992A1
EP1405992A1 EP03022279A EP03022279A EP1405992A1 EP 1405992 A1 EP1405992 A1 EP 1405992A1 EP 03022279 A EP03022279 A EP 03022279A EP 03022279 A EP03022279 A EP 03022279A EP 1405992 A1 EP1405992 A1 EP 1405992A1
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EP
European Patent Office
Prior art keywords
control system
engine
cooling fluid
value
des
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
EP03022279A
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English (en)
French (fr)
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EP1405992B1 (de
Inventor
Roberto Cipollone
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.)
Sogefi Air and Cooling SAS
Original Assignee
Mark IV Systemes Moteurs SAS
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Publication of EP1405992A1 publication Critical patent/EP1405992A1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/167—Controlling of coolant flow the coolant being liquid by thermostatic control by adjusting the pre-set temperature according to engine parameters, e.g. engine load, engine speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2023/00—Signal processing; Details thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature
    • F01P2025/46—Engine parts temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/60—Operating parameters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/60—Operating parameters
    • F01P2025/64—Number of revolutions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/60—Operating parameters
    • F01P2025/66—Vehicle speed

Definitions

  • the present invention relates to a control system for controlling a vehicle engine cooling system.
  • Known cooling systems supply cooling water to an internal combustion engine, which in turn supplies water to the inlet of a radiator via a thermostatic control valve, and the water from the radiator is pumped back into the engine.
  • the control valve also recirculates part of the water from the engine along a bypass conduit extending from the control valve to the engine cooling water inlet; and, before the water is recirculated, parallel branches may supply other user devices, such as the exhaust gas cooler before recirculation, passenger compartment heater, engine oil cooler, etc.
  • the cooling water temperature is regulated solely by the thermostatic valve, which is by nature extremely inaccurate (some known thermostatic valves, for example, operate on the basis of wax expansion, a poorly repeatable phenomenon which is difficult to control.
  • a control system for controlling a cooling system of a vehicle engine, wherein an internal combustion engine receives a stream F a of cooling fluid, and supplies a stream of fluid F u to the inlet of at least a radiator via regulating means controllable by a drive signal; said control system being characterized by comprising: a closed-loop control system, which receives a reference signal T des related to a desired operating temperature of the engine, and a signal T mis representing a measured operating temperature of the engine, said closed-loop control system generating a first component P cl_loop of said drive signal; and an open-loop control system, which receives at least said reference signal T des , and generates a second component P op_loop of said drive signal by means of a model representing the inverse engine-radiator thermal system.
  • the temperature of the cooling fluid thus converges to the reference temperature.
  • Number 1 in Figure 1 indicates as a whole a control system for controlling a cooling system 2 connected to an internal combustion engine 3 of a vehicle (not shown).
  • Internal combustion engine 3 receives a stream F a of cooling fluid (water for instance in the described example), and supplies a stream of water F u to the inlet of a radiator 4 via a control valve 5.
  • Radiator 4 in turn supplies a stream of water which is pumped back along a conduit 6 to engine 3 by a pump 7.
  • Control valve 5 (known type) also recirculates part of stream F u along a recirculating conduit 9 extending from control valve 5 to the engine cooling water inlet.
  • Control valve 5 operates under control of an actuator 10, which receives a drive signal P from an electronic central control unit 12.
  • Electronic central control unit 12 generates the drive signal by means of a closed-loop control system 14 and an open-loop control system 15.
  • closed-loop control system 14 comprises an adding node 17, to which are supplied, with opposite signs, a signal related to the measured operating temperature of the engine, in particular a signal representing the measured temperature T mis of cooling water stream F u at the outlet of engine 3, and a reference signal T des representing a desired target operating temperature of the engine, in particular a target temperature of the stream of cooling water.
  • Adding node 17 generates an error signal T des -T mis , which is supplied to a controller block 20 (e.g. a PID block) to generate a first drive signal component P cl_loop which in turn is supplied to an adding node 22.
  • a controller block 20 e.g. a PID block
  • the measured operating temperature of the engine may be defined by the temperature, measured at characteristic points on the engine, of the metal from which the engine is made; in which case, the reference temperature represents a target temperature of characteristic points of the engine.
  • a second drive signal component P op_loop is supplied by open-loop control system 15, which receives information relating to reference signal T des , and generates the second component P op_loop by means of a mathematical model representing the inverse engine-radiator thermal system.
  • Open-loop control system 15 comprises a number of blocks which together define a model of the engine-radiator thermal system.
  • open-loop control system 15 comprises a first block 30 (detailed below), which receives the desired engine operating temperature value T des (i.e. the desired cooling water temperature or the desired metal temperature at given points on the engine), and generates the estimated value of a coefficient Kr representing, in an appropriate model, the heat exchange performance of the radiator required to maintain the desired temperature value T des .
  • T des i.e. the desired cooling water temperature or the desired metal temperature at given points on the engine
  • Open-loop control system 15 comprises a second block 40, which receives the estimated value of coefficient Kr, and generates the value of the cooling water flow Qf which must be physically circulated in radiator 4 to maintain the desired temperature value T des .
  • the cooling water flow value is expressed as a function of the radiator fan operating state (on/off), and possibly fan speed in the case of electric fans with continuous or step speed adjustment.
  • Open-loop control system 15 comprises a third block 50, which receives the calculated cooling water flow value Qf and information relating to the fan on/off state or fan speed in the case of continuous or step speed adjustment.
  • block 50 calculates, on the basis of the information received, the opening value ⁇ of control valve 5 required to maintain the desired temperature value T des .
  • valve opening value refers not only to valve 5 in the Figure 1 embodiment, but also to the auxiliary valves (not shown in Figure 1 for the sake of simplicity) controlling cooling water flow in the various branches of the cooling circuit. Variations in the opening or closure of the auxiliary valves, in fact, affects cooling water flow to radiator 4.
  • the above calculation is performed using an appropriate table, which supplies an opening value ⁇ of valve 5 (and any auxiliary valves) for each input value Qf.
  • the first variation is advantageously used when the speed of pump 7 cannot be adjusted independently, in which case, flow can only be regulated by working on the opening of control valve 5 (and any auxiliary valves).
  • block 50 calculates, on the basis of the information received, the pump speed ⁇ and the opening ⁇ of valve 5 (and any auxiliary valves) which together provide for maintaining the desired temperature value T des .
  • the pump speed and opening of valve 5 are selected to maximize a given requirement, such as minimizing consumption or reducing noise.
  • the second variation is advantageously used when pump 7 allows of independent speed adjustment, in which case, flow can be regulated by working both on the opening of control valve 5 (and any auxiliary valves) and on the speed of the pump (electrically powered, program-powered by the drive shaft via friction wheels, electromagnetic clutches, etc..).
  • Equation (1) as shown above may obviously be based on a subset of the above nine input variables.
  • Equation (1) may be derived from analytical formulation, or from a test-based data table, or from a combination of the two.
  • engine sensor readings or information derived from processing them
  • the parameters of equation (1) can be updated continuously, or in predetermined time steps, or with reference to mileage, or on command.
  • Equation (2) as shown above may obviously be based on a subset of the above twelve input variables.
  • Equation (2) may be derived from a mathematical model, which determines the metal temperature at various characteristic points of the engine, or from a table of values memorized beforehand on the basis of test results, or from a combination of the two.
  • metal temperature T m may be estimated advantageously using a non-linear observer of the type below:
  • second block 40 comprises a block 41, which applies the Kr value to a first table which in return supplies the value Qf of the cooling water flow required by the radiator to maintain the desired temperature value T des .
  • the first table calculates flow in a condition in which the radiator fan is off.
  • Block 41 is followed by a block 42, which determines whether the calculated flow value is below a given limit value. If it is, the flow measured using the first table is acquired and used for subsequent calculations. Conversely, block 42 is followed by a block 43, which applies the Kr value to a second table which in return supplies the value Qf of the cooling water flow which must be physically implemented to maintain the desired temperature value T des .
  • the second table calculates flow in a condition in which the radiator fan is on, and likewise in the event the speed of the radiator fan is continuously or step adjustable.
  • control system Being a smart system, the control system according to the invention provides for all-round cooling water temperature control, thus greatly improving performance of all the thermal functions dependent on the engine cooling system, e.g. the vehicle heating system, EGR exhaust gas cooling system, etc.
  • the open-loop control system model may also supply an information flow Inf2 to controller 20 of closed-loop control system 14 to continuously update the control parameters of controller 20.
  • Information flow Inf2 thus provides for updating the parameters of the controller on the basis of information flow Inf1 from the engine.
  • Information flows Inf1, Inf2 may even be disabled or accentuated in relation to particular operating conditions of the engine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Feedback Control In General (AREA)
EP03022279A 2002-10-02 2003-10-01 Regelsystem zur Regelung eines Kühlungssystems einer Brennkraftmaschine eines Kraftfahrzeugs Expired - Lifetime EP1405992B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000852A ITTO20020852A1 (it) 2002-10-02 2002-10-02 Sistema di controllo per un impianto di raffreddamento del motore di
ITTO20020852 2002-10-02

Publications (2)

Publication Number Publication Date
EP1405992A1 true EP1405992A1 (de) 2004-04-07
EP1405992B1 EP1405992B1 (de) 2008-01-30

Family

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EP03022279A Expired - Lifetime EP1405992B1 (de) 2002-10-02 2003-10-01 Regelsystem zur Regelung eines Kühlungssystems einer Brennkraftmaschine eines Kraftfahrzeugs

Country Status (5)

Country Link
EP (1) EP1405992B1 (de)
AT (1) ATE385284T1 (de)
DE (1) DE60318926T2 (de)
ES (1) ES2298456T3 (de)
IT (1) ITTO20020852A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007003245B4 (de) * 2006-01-27 2012-10-31 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Verfahren zum Entwerfen eines Motorkomponenten-Temperaturschätzers
CN114991934A (zh) * 2022-06-10 2022-09-02 上海源悦汽车电子股份有限公司 一种发动机冷却液温度控制方法、系统及可读存储模块

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009012572B4 (de) * 2009-03-11 2014-01-02 Audi Ag Verfahren und Vorrichtung zur Steuerung eines Kühlmittelkreislaufs in einem Kraftfahrzeug
DE102009056575B4 (de) * 2009-12-01 2014-01-02 Continental Automotive Gmbh Verfahren und Vorrichtung zum Ermitteln eines modellierten Temperaturwertes bei einer Brennkraftmaschine und Verfahren zur Plausibilisierung eines Temperatursensors

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05231149A (ja) * 1992-02-21 1993-09-07 Honda Motor Co Ltd エンジンの冷却装置
US5758607A (en) * 1995-05-26 1998-06-02 Bayerische Motoren Werke Aktiengesellschaft Cooling system having an electrically adjustable control element
US6321695B1 (en) * 1999-11-30 2001-11-27 Delphi Technologies, Inc. Model-based diagnostic method for an engine cooling system
DE10123444A1 (de) * 2001-05-14 2002-11-28 Siemens Ag Verfahren zum Regeln der Kühlmitteltemperatur einer Brennkraftmaschine
DE10163944A1 (de) * 2001-12-22 2003-07-03 Bosch Gmbh Robert Verfahren zur Ansteuerung von elektrisch betätigbaren Komponenten eines Kühlsystems, Computerprogramm, Steuergerät, Kühlsystem und Brennkraftmaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05231149A (ja) * 1992-02-21 1993-09-07 Honda Motor Co Ltd エンジンの冷却装置
US5758607A (en) * 1995-05-26 1998-06-02 Bayerische Motoren Werke Aktiengesellschaft Cooling system having an electrically adjustable control element
US6321695B1 (en) * 1999-11-30 2001-11-27 Delphi Technologies, Inc. Model-based diagnostic method for an engine cooling system
DE10123444A1 (de) * 2001-05-14 2002-11-28 Siemens Ag Verfahren zum Regeln der Kühlmitteltemperatur einer Brennkraftmaschine
DE10163944A1 (de) * 2001-12-22 2003-07-03 Bosch Gmbh Robert Verfahren zur Ansteuerung von elektrisch betätigbaren Komponenten eines Kühlsystems, Computerprogramm, Steuergerät, Kühlsystem und Brennkraftmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 0176, no. 86 (M - 1529) 15 December 1993 (1993-12-15) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007003245B4 (de) * 2006-01-27 2012-10-31 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Verfahren zum Entwerfen eines Motorkomponenten-Temperaturschätzers
CN114991934A (zh) * 2022-06-10 2022-09-02 上海源悦汽车电子股份有限公司 一种发动机冷却液温度控制方法、系统及可读存储模块
CN114991934B (zh) * 2022-06-10 2024-02-06 上海源悦汽车电子股份有限公司 一种发动机冷却液温度控制方法、系统及可读存储模块

Also Published As

Publication number Publication date
DE60318926D1 (de) 2008-03-20
DE60318926T2 (de) 2009-01-22
EP1405992B1 (de) 2008-01-30
ES2298456T3 (es) 2008-05-16
ATE385284T1 (de) 2008-02-15
ITTO20020852A1 (it) 2004-04-03

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