EP0106741B1 - Procédé de détection de chute de pression d'huile et dispositif de mise en oeuvre - Google Patents

Procédé de détection de chute de pression d'huile et dispositif de mise en oeuvre Download PDF

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Publication number
EP0106741B1
EP0106741B1 EP19830401844 EP83401844A EP0106741B1 EP 0106741 B1 EP0106741 B1 EP 0106741B1 EP 19830401844 EP19830401844 EP 19830401844 EP 83401844 A EP83401844 A EP 83401844A EP 0106741 B1 EP0106741 B1 EP 0106741B1
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EP
European Patent Office
Prior art keywords
pressure
oil
engine
warning threshold
value
Prior art date
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Expired
Application number
EP19830401844
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German (de)
English (en)
French (fr)
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EP0106741A1 (fr
Inventor
François Aussedat
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.)
Renault SA
Original Assignee
Regie Nationale des Usines Renault
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Application filed by Regie Nationale des Usines Renault filed Critical Regie Nationale des Usines Renault
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    • 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
    • F01M1/00—Pressure lubrication
    • F01M1/18—Indicating or safety devices
    • F01M1/20—Indicating or safety devices concerning lubricant pressure

Definitions

  • the present invention relates to a method for detecting the drop in oil pressure in a heat engine as well as a device allowing the implementation of this method.
  • the object of the present invention is therefore to enable a detection of a drop in oil pressure which depends on the operating conditions of the heat engine in such a way that the alert can be triggered before any risk of deterioration of the heat engine.
  • the invention is based on the theoretical study of variations in oil pressure during normal operation of a heat engine depending on the engine speed, that is to say its speed and the temperature. oil. It has thus been noted that the oil pressure can vary in normal operation between 1 and 6 bars, depending on the operating conditions.
  • the method for detecting a drop in oil pressure in a heat engine consists in measuring the oil pressure and in comparing it with a value corresponding to a determined alert threshold which varies as a function of the speed of engine rotation and depending on the oil temperature.
  • the alert threshold values preferably remain lower, whatever the oil temperature measured, than a determined upper limit value and greater than a determined lower limit value.
  • the alert threshold values are defined from a model curve in the engine pressure / speed space, said model curve being stored and corresponding to a maximum oil temperature.
  • the said curve curve is then moved as a function of the oil temperature so that, for a given oil temperature, the value of the warning threshold thus obtained is less by a quantity of safety, for example of the order of 1 bar than the value of the normal oil pressure of the heat engine under the given conditions.
  • the displacement of the memorized model curve advantageously takes place in the pressure / engine speed plane, according to a direction vector of predetermined slope.
  • the slope of the steering vector can be easily determined by examining a network of variation curves of the engine oil pressure considered as a function of the oil temperature.
  • the memorized model curve can consist of a portion of a curved line, a plurality of line segments or a single portion of line inclined in the pressure / engine speed space.
  • the device for implementing the method of the invention comprises a temperature sensor and an analog / digital converter associated with a device for shaping the signal from the temperature sensor.
  • the device further comprises a pressure sensor and an analog / digital converter associated with a device for shaping the signal from the pressure sensor.
  • the device also comprises a sensor for the speed of rotation of the thermal engine and a converter associated with a device for shaping the frequency signal from the sensor for the speed of the engine.
  • the device further comprises a computer constituted for example by a programmable microprocessor which receives the signals from the various aforementioned sensors and which includes means for memorizing data defining the model pressure alert pressure curve as a function of the rotation speed of the engine for maximum oil temperature.
  • the limit values for the alert threshold pressure are also stored in the computer.
  • the computer can be programmed to make a correction to the engine speed as measured as a function of the oil temperature also measured by the various sensors.
  • the computer can then make a new correction of the warning threshold pressure value thus calculated from the stored data as a function of the measured oil temperature, then is able to compare the value thus corrected with the pressure measured by the sensor. pressure providing an alert signal when the measured pressure is lower than the corrected value obtained by the computer.
  • FIG. 1 illustrates by way of example the curves obtained for a heat engine determined as a function of the oil temperature.
  • the oil pressure in bar is shown on the ordinate and the engine rotation speed or engine speed in revolutions / min on the abscissa.
  • the oil pressure is measured at the outlet of the circulation and has two distinct portions.
  • the heat engine is idling, here for example around 800 rpm.
  • the oil pressure can vary by about 0.8 bar when the oil is at a very high temperature of the order of 120 to 130 ° C, which corresponds for example to the case of stopping of the vehicle at a highway toll, at a higher value of the order of 4 to 5 bars for a cold start.
  • the different points A of each of the curves of the network illustrated in FIG. 1 move widely on the ordinate which indicates a very important influence of the temperature of the oil on its pressure.
  • Point B is always around 4 bars.
  • the break of each curve at point B corresponds to the opening of the oil pump relief valve which is here fixed by construction at 4 bars.
  • the different points B of the curve network could be at a different value if the valve was tared differently for another engine.
  • the abscissa of point B can vary between 800 to 1000 rpm in the case of a cold idle and 2500 to 3000 rpm in the case of a relatively worn engine for a high oil temperature.
  • Point C corresponds to a high engine speed.
  • the pressure at this operating point can vary according to the curves between approximately 4 bars for a very high oil temperature and approximately 8 bars for a cold start.
  • the curve portions between A and B are formed as can be seen in Figure 1 by curved lines while the portions between B and C are formed substantially by straight lines.
  • the different reference breakpoints B of the set of network curves are substantially aligned on a straight line shown in phantom in Figure 1. This straight line has a slight negative slope with respect to the horizontal which corresponds substantially in the example considered at a pressure variation of 0.4 bar for a speed variation of 1000 revolutions / min.
  • the value of the alert threshold P varies both as a function of the engine speed and as a function of the oil temperature.
  • two upper limit values P max are defined for this alert threshold.
  • the value of P max is 3.5 bars for regimes higher than 2000 rpm while the value of Pm ax is 3 bars for regimes lower than 2000 rpm .
  • a lower limit value Pmin is defined which, in the example considered, is fixed at 0.4 bar whatever the engine speed.
  • a model curve of variation of the value of the alert threshold is also defined for a maximum oil temperature here fixed at 140 ° C.
  • the variations of the corresponding alert threshold value P140 are constituted here by way of example as can be seen in FIG. 1, by a straight line inclined with respect to the horizontal and the slope of which is chosen so as to correspond substantially at the average slope of the curve segments AB of the curve networks of the variations in oil pressure as a function of temperature.
  • the variations in the value of the alert threshold P140 are here estimated by approximation to a straight line, it could of course be provided for several portions of straight line segments or even a memorized curved line.
  • the curve of the variations of the alert threshold for the maximum temperature P, 40 is displaced, the displacement being made according to a director vector whose slope is the same as that of the various substantially aligned points B of the network of oil pressure curve as a function of the oil temperature.
  • the movement is carried out up to point M 100 located on the line segment P 100 represented in dashes, which corresponds to the movement of the line P 140 according to the director vector M 140 , M 100 .
  • the line segment P 100 therefore defines the value of the alert threshold at the temperature of 100 ° C.
  • the threshold pressure values follow the instantaneous pressures defined on the curve corresponding to the temperature of 100 ° C to within 1 bar, the difference constituting a safety margin.
  • the alert threshold defined according to the method of the invention will be of the order of 2 bars (ordinate from point M 100 ) whereas in a conventional oil pressure drop detection device the alert threshold would have been set by a pressure switch to around 0.35 bar.
  • the value of the alert threshold will be the maximum value P max of 3.5 bars.
  • the oil pressure drop detection device allowing the implementation of the present invention comprises either a microprocessor calculation unit or wired logic in the case of a simplified maximum threshold pressure curve.
  • a microprocessor calculation unit or wired logic in the case of a simplified maximum threshold pressure curve.
  • the device comprises an oil temperature sensor 1 comprising for example a heat resistance fixed on the oil line in the heat engine and the variation range of which is preferably between 40 ° C. and 140 ° C.
  • An analog / digital converter 2 associated with a correspondence table in the calculation unit 3 makes it possible to transform the resistance values obtained into temperature values as well as the shaping of the signal.
  • the pressure sensor 4 is preferably located in the engine oil line. It delivers a ohmic resistance proportional to the oil pressure.
  • An analog / digital converter 5 makes it possible to transform the measured resistance values into pressure values p as well as the shaping of the signal according to a correspondence table contained in the calculation unit.
  • the device is completed by a memory 8 containing the various execution programs and a random access memory 7 containing the data defining the model curve of the alert threshold pressure as well as the various limit values for the alert threshold.
  • a control device 8 can emit an alarm triggering signal 9.
  • the information corresponding to the engine speed comes from the breaker 10 connected to a converter 11 associated with a signal shaping device and connected to a rocker 12 whose output signal attacks a computing unit 3.
  • the signal frequency corresponding to the engine speed varies between 0 and 200 Hz which corresponds to a variation of the engine speed ranging from 0 to 6000 rpm.
  • the operation of the device is illustrated in the flow diagram of FIG. 3, after the system has been started up with the “start” information referenced 13, and initialization 14, the calculation unit causes the measurement of the instantaneous pressure p; and its conversion according to the correspondence table of the ohms measured in bars. This operation is referenced 15. Then, according to operation 16, the temperature of the engine oil t is measured and the resistance signal measured is converted. ohms in ° C. The following operation 17 consists in calculating the engine speed N by converting the frequency of the signal from the switch to engine speed values in revolutions / min.
  • the engine speed N is then corrected as a function of the aforementioned measured oil temperature.
  • a correction is equivalent to subjecting the memorized model curve to variations in the alert threshold P 140 , a translation along the abscissa axis from point M 140 to point M '.
  • this correction can be made by adding 500 revolutions / min by variation of 20 ° C less for the oil temperature measured with respect to the maximum temperature of 140 ° C.
  • the following operation (referenced 19 in FIG. 3) consists in calculating the alert threshold pressure as a function of the engine speed N thus corrected (definition of point M 'in FIG. 1).
  • the value thus obtained is again corrected as a function of the oil temperature t, which amounts to translating from point M ′ to point M 100 along the ordinate axis.
  • the two corrections thus carried out correspond to the translation along the director vector M 140 , M 100 in the example illustrated, where the oil temperature was equal to 100 ° C., this vector being parallel as indicated in the straight line substantially joining all the points B of the network of curves of variations in oil pressure as a function of temperature.
  • Operation 21 of the flow diagram of FIG. 3 performs a comparison of the engine speed measured with respect to the threshold of 2000 rpm and limits the threshold pressure obtained to 3.5 bars for rpm higher than 2000 rpm and at 3 bars for speeds less than or equal to 2000 rpm. This is the limitation of the lines P max in FIG. 1.
  • operation 22 defines the limitation of the threshold pressure P to the minimum pressure P min of 0.4 bar.
  • operation 23 consists in comparing the threshold pressure thus obtained (for example the pressure corresponding to point M 100 ) with the instantaneous pressure P; measured after smoothing the information. Advance warning can advantageously be triggered when the difference between the alert threshold pressure thus defined and the instantaneous pressure P; is less than 0.4 bar. In any case, the alert is triggered when the instantaneous pressure is lower than the alert threshold pressure thus defined.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
EP19830401844 1982-09-24 1983-09-22 Procédé de détection de chute de pression d'huile et dispositif de mise en oeuvre Expired EP0106741B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8216094 1982-09-24
FR8216094A FR2533623A1 (fr) 1982-09-24 1982-09-24 Procede de detection de chute de pression d'huile et dispositif de mise en oeuvre

Publications (2)

Publication Number Publication Date
EP0106741A1 EP0106741A1 (fr) 1984-04-25
EP0106741B1 true EP0106741B1 (fr) 1986-02-26

Family

ID=9277703

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EP19830401844 Expired EP0106741B1 (fr) 1982-09-24 1983-09-22 Procédé de détection de chute de pression d'huile et dispositif de mise en oeuvre

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Country Link
EP (1) EP0106741B1 (enrdf_load_stackoverflow)
DE (1) DE3362326D1 (enrdf_load_stackoverflow)
FR (1) FR2533623A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4025104A1 (de) * 1990-08-08 1992-02-13 Kloeckner Humboldt Deutz Ag Oeldruckniveau-anzeige

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6901788B2 (en) * 2003-04-25 2005-06-07 Delphi Technologies, Inc. Apparatus and method for determining oil change based upon oil viscosity
EP1561916B1 (de) * 2004-02-09 2006-12-13 Ford Global Technologies, LLC, A subsidary of Ford Motor Company Verfahren zur Feststellung eines Ölmangelzustandes in einem Verbrennungsmotor
FR2886976A1 (fr) * 2005-06-10 2006-12-15 Peugeot Citroen Automobiles Sa Methode pour detecter le niveau d'oxydation d'une huile moteur et recommander une vidange
US7665352B2 (en) * 2007-02-06 2010-02-23 Gm Global Technology Operations, Inc. Adaptive oil pressure fault detection
US11326590B2 (en) * 2020-01-08 2022-05-10 GM Global Technology Operations LLC Method and apparatus for controlling a variable displacement pump
CN115095407B (zh) * 2022-05-25 2024-03-19 潍柴动力股份有限公司 一种柴油机机油压力控制方法及系统
CN119531989A (zh) * 2024-11-29 2025-02-28 广西玉柴船电动力有限公司 一种新型的机油压差报警策略

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3977384A (en) * 1971-07-31 1976-08-31 Motoren- Und Turbinen-Union Friedrichshafen Gmbh Internal combustion engine oil pressure loss safety device
US4102316A (en) * 1977-04-07 1978-07-25 Caterpillar Tractor Co. Hydromechanical shutoff for an internal combustion engine
DE2935938C2 (de) * 1979-09-06 1984-03-22 Audi Nsu Auto Union Ag, 7107 Neckarsulm Vorrichtung zum Überwachen des Schmieröldruckes einer Brennkraftmaschine in einem Kraftfahrzeug

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4025104A1 (de) * 1990-08-08 1992-02-13 Kloeckner Humboldt Deutz Ag Oeldruckniveau-anzeige

Also Published As

Publication number Publication date
FR2533623B1 (enrdf_load_stackoverflow) 1985-01-25
EP0106741A1 (fr) 1984-04-25
FR2533623A1 (fr) 1984-03-30
DE3362326D1 (en) 1986-04-03

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