EP1452701A1 - Verfahren und Vorrichtung zur Berechnung der Öltemperatur einer Brennkraftmaschine - Google Patents

Verfahren und Vorrichtung zur Berechnung der Öltemperatur einer Brennkraftmaschine Download PDF

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Publication number
EP1452701A1
EP1452701A1 EP04300088A EP04300088A EP1452701A1 EP 1452701 A1 EP1452701 A1 EP 1452701A1 EP 04300088 A EP04300088 A EP 04300088A EP 04300088 A EP04300088 A EP 04300088A EP 1452701 A1 EP1452701 A1 EP 1452701A1
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EP
European Patent Office
Prior art keywords
temperature
oil
engine
predicted
coolant
Prior art date
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Granted
Application number
EP04300088A
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English (en)
French (fr)
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EP1452701B1 (de
Inventor
Jean-Baptiste Bonnet
Emmanuel Sedda
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.)
PSA Automobiles SA
Original Assignee
Peugeot Citroen Automobiles SA
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Publication of EP1452701A1 publication Critical patent/EP1452701A1/de
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Anticipated expiration legal-status Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/10—Indicating devices; Other safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
    • F01M5/005—Controlling temperature of lubricant

Definitions

  • the invention relates to a method for evaluating the oil temperature of an internal combustion engine and a system for implementing this method. She is applicable in particular to automobile engines.
  • the present invention proposes to estimate the vehicle engine oil temperature from of information available in the control devices of the engine without having to use an oil temperature sensor of the motor.
  • the invention makes it possible to avoid the use of an oil temperature sensor motor and associated electronic circuits.
  • steps (e) and (d) can be done in one step. Prediction calculation incorporates then a correction taking into account the error calculated on the water temperature.
  • the predicted temperature error value of the oil to be corrected is substantially proportional to the error between the measured coolant temperature and the predicted coolant temperature.
  • the invention also relates to a system for estimating the oil temperature of an engine at explosion (M) implementing this process.
  • This system includes a processing system implementing a first algorithm predicting the coolant temperature in function of engine operating parameters and providing a predicted temperature of the cooling.
  • An error calculation circuit calculates the error between a measured coolant temperature and the temperature thus predicted.
  • the treatment system puts implement a second temperature prediction algorithm engine oil based on operating parameters of the engine and provides a predicted oil temperature.
  • a correction circuit corrects the oil temperature predicted at using the error calculated by the error calculation circuit and provides an estimated oil temperature.
  • the system according to the invention uses nonlinear functions (f (c, n), g (c, n)) approximated by coolant temperature maps and oil temperatures for different parameters of engine operation.
  • the temperature of the engine lubricating oil and coolant i.e. engine therefore also undergoes variations in based on these parameters.
  • a vehicle generally has a water temperature, information on the engine torque and its diet.
  • the object of the invention is to determine the value of engine oil temperature using temperature water and various engine operating parameters and this without using a temperature measurement sensor oil.
  • a first algorithm predicts the water temperature at from an internal (mathematical) model using as input information such as engine load and speed. This predicted water temperature is then compared to the water temperature measured by the sensor.
  • a second algorithm predicts the temperature of oil from an internal (mathematical) model using input of information such as load and speed of the engine.
  • the error between the water temperature predicted by the first algorithm and the measured water temperature allows correct the oil temperature predicted by the second algorithm. This correction provides a estimate of engine oil temperature.
  • a first first order differential equation allows to estimate the temperature of the cooling water
  • a second first order differential equation allows estimate the engine oil temperature
  • the model change in water temperature is identical to that used for oil.
  • the water temperature predicted by the model is corrected by measuring the actual temperature. This correction made on the water temperature allows correct the predicted oil temperature.
  • the invention therefore makes it possible to dispense with a oil temperature and associated processing system and transmission of electrical signals.
  • the method according to the invention therefore provides, as indicated above, from different information from engine operation - such as water temperature cooling, engine load, engine speed - to determine the engine oil temperature.
  • the non-linearities appearing in FIG. 2a to 100s and 300s are respectively the opening of the thermostat and the start-up of the fan motor groups. In these conditions, to keep a simple model, we will not account for these phenomena. However, alternatively, for a better precision on the estimation of the oil temperature, the thermostat and the GMV start-up are taken into account.
  • Tests therefore made it possible to establish maps at constant speed depending on the load such as that of Figure 3a for the mapping of the water temperature of engine cooling, and that of Figure 3b for the engine oil temperature mapping.
  • the maps f (c, n) and g (c, n) are defined, for example, for nine points of operation recorded on a dynamometer. Between these points of operation, we perform a linear interpolation for determine a specific operating temperature that will call target temperature.
  • f (c, n) / g (c, n) In order to determine f (c, n) / g (c, n), we have, for simplify the system, performed temperature division "Targets" for the nine operating points identified and then calculated the average value of these reports. In the model thus implemented, f (c, n) / g (c, n) is therefore considered to be a constant.
  • Figure 4a shows a general example of realization of this system.
  • Motor M is fitted with a TE temperature sensor capable of measuring the water temperature of engine cooling.
  • Motor M has devices such as P1 and P2 capable of indicating parameters of engine operation such as, for example, torque developed by the engine and the rotation speed as it has been considered in the previous examples.
  • the values of these operating parameters are applied to the inputs of two processing devices A1 and A2 which provide, respectively, a predicted temperature Cooling water head and predicted temperature Engine oil oil.
  • a calculation circuit D1 receives the measured temperature Teau the predicted temperature Teau of the cooling water, compare these temperatures and provide a calf value representing this difference.
  • another calculation circuit D2 receives the predicted temperature of the engine oil oil as well as the calf value calculated previously and provides a value of the oil temperature corrected.
  • FIG. 4b shows a more detailed system allowing the invention to be implemented.
  • This system includes, as in FIG. 4a, devices P1 and P2 providing engine operating parameters as well as a TE temperature providing the water temperature of engine cooling.
  • the system has a map in memory G (c, n) of the cooling water temperatures as a function a type of parameter (the couple for example) for different values of another parameter (engine speed for example). It also has a similar mapping f (c, n) for the engine oil temperatures.
  • the mapping g (c, n) is used in a algorithm A1 using parameters c and n provided by P1 and P2 devices.
  • the algorithm provides a temperature predicted Tpeau.
  • a difference circuit receives this temperature predicted as well as the water temperature measured by the TE sensor and provides a water difference value. This difference is transmitted to an operator OP1 which multiplies it by a value mean of different ratios f (c, n) / g (c, n) calculated for different engine operating points.
  • OP1 operator provides an oil value which represents substantially uncertainty about the calculation of the temperature value of oil to reach in steady state.
  • mapping G (c, n) is used in an A2 algorithm using the parameters c and n provided by devices P1 and P2.
  • the algorithm also takes into account the value of the oil and provides a temperature for the oil.
  • the water temperature at startup is used as the initial value of the oil temperature. If the engine is cold when starting, the water is substantially equal to the oil. If the engine is hot, the two temperatures can be different (in principle, a difference less than ten degrees). Initialize the oil temperature estimator to a value does not disturb its convergence, as shown by Figures 5a and 5b. In what follows, the initial value of the oil temperature will therefore be initialized to the value initial water temperature.
  • An advantage of this system is the speed of convergence of the estimate which makes it insensitive to value initializing. This removes the problem of estimating the temperature at standstill because it is possible to initialize the system with water temperature at start-up.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
EP04300088A 2003-02-27 2004-02-19 Verfahren und Vorrichtung zur Berechnung der Öltemperatur einer Brennkraftmaschine Expired - Lifetime EP1452701B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0302379 2003-02-27
FR0302379A FR2851784B1 (fr) 2003-02-27 2003-02-27 Procede et systeme d'evaluation de la temperature de l'huile d'un moteur a combustion

Publications (2)

Publication Number Publication Date
EP1452701A1 true EP1452701A1 (de) 2004-09-01
EP1452701B1 EP1452701B1 (de) 2009-02-18

Family

ID=32749735

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04300088A Expired - Lifetime EP1452701B1 (de) 2003-02-27 2004-02-19 Verfahren und Vorrichtung zur Berechnung der Öltemperatur einer Brennkraftmaschine

Country Status (5)

Country Link
EP (1) EP1452701B1 (de)
AT (1) ATE423269T1 (de)
DE (1) DE602004019464D1 (de)
ES (1) ES2320548T3 (de)
FR (1) FR2851784B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2996253A1 (fr) * 2012-10-01 2014-04-04 Peugeot Citroen Automobiles Sa Dispositif de calcul d'un modele de temperature d'huile pour un moteur thermique equipe d'un rechauffeur additionnel
CN110411607A (zh) * 2019-07-15 2019-11-05 山东新华医疗器械股份有限公司 灭菌器温度传感器的多点校验方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016222044B3 (de) 2016-11-10 2018-05-30 Continental Automotive Gmbh Verfahren und Vorrichtung zum Ermitteln der Öltemperatur in einer Brennkraftmaschine

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4847768A (en) * 1988-08-29 1989-07-11 General Motors Corporation Automatic engine oil change indicator system
US5633796A (en) * 1994-12-12 1997-05-27 Ford Motor Company Method and apparatus for inferring engine oil temperature for use with an oil change indicator
DE19961118A1 (de) * 1999-12-17 2001-07-05 Siemens Ag Verfahren zum Bestimmen der Motoröltemperatur in einer Brennkraftmaschine
DE10006533A1 (de) * 2000-02-15 2001-10-11 Siemens Ag Verfahren zum Bestimmen der Öltemperatur bei einer Brennkraftmaschine
US6393357B1 (en) * 2000-07-17 2002-05-21 Ford Global Technologies, Inc. System and method for inferring engine oil temperature at startup
US6449538B1 (en) * 2001-03-19 2002-09-10 Honda Giken Kogyo Kabushiki Kaisha Engine oil degradation detector
DE10119786A1 (de) * 2001-04-23 2002-10-31 Siemens Ag Verfahren zum Bestimmen der Öltemperatur in einer Brennkraftmaschine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4847768A (en) * 1988-08-29 1989-07-11 General Motors Corporation Automatic engine oil change indicator system
US5633796A (en) * 1994-12-12 1997-05-27 Ford Motor Company Method and apparatus for inferring engine oil temperature for use with an oil change indicator
DE19961118A1 (de) * 1999-12-17 2001-07-05 Siemens Ag Verfahren zum Bestimmen der Motoröltemperatur in einer Brennkraftmaschine
DE10006533A1 (de) * 2000-02-15 2001-10-11 Siemens Ag Verfahren zum Bestimmen der Öltemperatur bei einer Brennkraftmaschine
US6393357B1 (en) * 2000-07-17 2002-05-21 Ford Global Technologies, Inc. System and method for inferring engine oil temperature at startup
US6449538B1 (en) * 2001-03-19 2002-09-10 Honda Giken Kogyo Kabushiki Kaisha Engine oil degradation detector
DE10119786A1 (de) * 2001-04-23 2002-10-31 Siemens Ag Verfahren zum Bestimmen der Öltemperatur in einer Brennkraftmaschine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2996253A1 (fr) * 2012-10-01 2014-04-04 Peugeot Citroen Automobiles Sa Dispositif de calcul d'un modele de temperature d'huile pour un moteur thermique equipe d'un rechauffeur additionnel
CN110411607A (zh) * 2019-07-15 2019-11-05 山东新华医疗器械股份有限公司 灭菌器温度传感器的多点校验方法

Also Published As

Publication number Publication date
EP1452701B1 (de) 2009-02-18
FR2851784B1 (fr) 2005-05-27
ATE423269T1 (de) 2009-03-15
ES2320548T3 (es) 2009-05-25
FR2851784A1 (fr) 2004-09-03
DE602004019464D1 (de) 2009-04-02

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