EP0958448A1 - Method for controlling oil flow rate in a two-stroke engine with separate lubrication and related engine - Google Patents

Method for controlling oil flow rate in a two-stroke engine with separate lubrication and related engine

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Publication number
EP0958448A1
EP0958448A1 EP98955711A EP98955711A EP0958448A1 EP 0958448 A1 EP0958448 A1 EP 0958448A1 EP 98955711 A EP98955711 A EP 98955711A EP 98955711 A EP98955711 A EP 98955711A EP 0958448 A1 EP0958448 A1 EP 0958448A1
Authority
EP
European Patent Office
Prior art keywords
engine
temperature
thermal load
representative
oil
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
EP98955711A
Other languages
German (de)
French (fr)
Other versions
EP0958448B1 (en
Inventor
Jacques Lavy
Yoichi Ishibashi
Philippe Girard
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.)
IFP Energies Nouvelles IFPEN
Total Marketing Services SA
Honda R&D Co Ltd
Original Assignee
Elf Antar France
IFP Energies Nouvelles IFPEN
TotalFinaElf France SA
Honda R&D Co Ltd
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 Elf Antar France, IFP Energies Nouvelles IFPEN, TotalFinaElf France SA, Honda R&D Co Ltd filed Critical Elf Antar France
Publication of EP0958448A1 publication Critical patent/EP0958448A1/en
Application granted granted Critical
Publication of EP0958448B1 publication Critical patent/EP0958448B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F01M3/00—Lubrication specially adapted for engines with crankcase compression of fuel-air mixture or for other engines in which lubricant is contained in fuel, combustion air, or fuel-air mixture
    • F01M3/02—Lubrication specially adapted for engines with crankcase compression of fuel-air mixture or for other engines in which lubricant is contained in fuel, combustion air, or fuel-air mixture with variable proportion of lubricant to fuel, lubricant to air, or lubricant to fuel-air-mixture

Definitions

  • the present invention relates to the field of two-stroke internal combustion engines in which the oil is injected independently of the petrol. These motors are also called separate lubrication motors.
  • the present invention relates to controlling the flow rate, or metering, of the oil injected into this type of engine.
  • Known oil metering systems generally comprise a mechanical metering pump controlled as a function of parameters such as the speed and / or the position of the throttle valve, this latter parameter being representative of the engine load.
  • the present invention proceeds from a different technical choice.
  • the present invention proposes to base the control of the oil flow on the temperature of an element of the engine representative of the level of thermal load of the engine.
  • the risk of engine damage can be very significant in the event of a fault in the cooling system or in the event of significant overheating.
  • the most efficient systems operate according to parameters such as load and / or engine speed.
  • the present invention makes it possible to solve the problems mentioned above, in particular those linked to the overheating of the engine and the excessive consumption of oil.
  • the subject of the present invention is a method for controlling the flow of lubricating oil of a two-stroke internal combustion engine comprising a circuit for injecting lubricating oil, which consists in acting on the oil flow lubrication as a function of a temperature representative of the engine thermal load.
  • the temperature representative of the thermal load is the temperature of an element constituting said motor.
  • the engine comprises an ignition element provided with a seal.
  • the temperature representative of the thermal load of the engine is the temperature of said seal.
  • the temperature representative of the thermal load of the engine is the temperature of the ignition element.
  • the flow rate of lubricating oil injected into the engine is increased when the temperature representative of the engine thermal load exceeds a predetermined threshold value.
  • the action on the lubrication oil flow can be obtained by controlling the closing of said leak circuit.
  • the invention further relates to a two-stroke internal combustion engine comprising a circuit for injecting a flow of lubricating oil.
  • the engine includes:
  • a sensor for measuring a temperature representative of the thermal load of said motor which delivers a signal representative of said temperature to an output
  • a module for processing said signal provided with an input connected to the output of the sensor for measuring said temperature and with an output which delivers a control signal
  • said adjustment means reacting to the control signal produced by the processing module so that the flow rate of lubricating oil is modified as a function of a temperature representative of the thermal load of the engine, measured by said temperature sensor which is disposed on a component of said motor.
  • the engine is air cooled and comprises an ignition element provided with a seal, the sensor for measuring the temperature representative of the thermal load of the engine is then placed on said seal.
  • the engine according to the invention comprising an ignition element, the temperature measurement sensor is disposed on said ignition element.
  • the engine according to the invention may comprise a load measurement sensor and / or a speed measurement sensor of said engine, the output of each of them being connected to an input of said module. treatment so that the flow of lubricating oil is further modified according to the load and / or the engine speed.
  • FIG. 1 is a diagram showing the main elements necessary for the implementation of the invention.
  • FIG. 2 shows a set of engine torque curves as a function of the temperature of a characteristic element of the engine.
  • FIG. 1 shows an air-cooled two-stroke engine 1 with an oil inlet pipe 2.
  • the flow of oil on this inlet is controlled by an element 3 such as a valve actuated by a solenoid.
  • an oil tank 4 and a pump 5 constitute the oil supply controlled by the solenoid 3.
  • the fuel inlet is provided separately from the oil inlet 2.
  • the oil flow leaving the pump 5 is divided into two conduits: the main motor supply conduit 2 and a bypass conduit 10 where part of the oil is recycled upstream of the pump 5. It is preferable to insert a non-return valve 6 in the by-pass duct 10.
  • a second non-return valve 11 can also be installed on the main conduit 2, near the engine oil inlet to avoid in particular the supply of engine oil during its stop.
  • the calibration of the second valve 11 is then a function of the calibration of the valve 6.
  • the main supply 2 and bypass ducts 10 will be dimensioned so as to deliver a minimum flow rate required by the motor when the bypass duct 10 is open, and a maximum flow rate required by the motor when the bypass duct -pass 10 is closed.
  • the solenoid 3 can command the all-or-nothing opening of the by-pass duct 10, allowing either a minimum flow (normal conditions; open by-pass) or a maximum flow (overload conditions thermal; bypass closed).
  • the solenoid 3 can move gradually (or according to a variable frequency) and cause a partial and variable closure system of the bypass duct 10: for example using d '' a needle of variable section.
  • the opening of the conduit 10 will thus take place as the thermal load of the engine increases, thereby allowing a gradual increase in the oil flow rate in said conduit 10.
  • An electronic calculation unit 7 can advantageously be provided in order in particular to control the solenoid 3.
  • the unit 7 is also connected to an element representative of the thermal load of the engine such as the spark plug or more precisely to a sensor of temperature 8 placed on the spark plug seal 12.
  • the senor 8 permanently supplies the temperature of the spark plug seal to the calculation unit 7 which itself and, in particular as a function of the temperature supplied, controls the solenoid 3 in the manner indicated above.
  • the oil pump 5 can also be connected to a pulley 9 which is itself connected to the throttle valve. This system makes it possible to control the flow rate via the engine load. It is not necessary for the implementation of the invention. It is an additional element that can improve flow control via temperature.
  • This additional element can be useful in the event of a temperature control system failure. It can thus be considered as a redundant element.
  • the control of the oil flow by the unit 7 can be envisaged via a temperature sensor representative of the level of thermal load of the engine.
  • a coolant temperature sensor can allow this control.
  • a temperature sensor for the jacket, the casing or the exhaust can also be provided, in particular in the case of an air-cooled engine.
  • a temperature threshold memorized in unit 7, determines the moment when the flow rate must be modified.
  • the present invention allows better management of the oil flow, that is to say ultimately a reduction in consumption.
  • This figure shows a set of curves (A, B, C) of the torque C as a function of the temperature T of an element characteristic of the engine temperature, here the temperature of the spark plug seal, for different gasoline / oil mass ratios. lubrication.
  • the lubrication of an engine is therefore directly linked to the tightening problems which appear in the engine as soon as the lubrication is insufficient and a rupture of the oil film occurs. Tightening problems are also linked to the thermal load level of the engine and mainly to the temperature of the piston. The warmer the engine, the greater the risk of tightening (and therefore of engine deterioration). At the same time, the lower the quantity of lubricant introduced (high fuel / lubricant ratio), the more the tightening appears at low temperature.
  • Tightening is characterized by the sudden drop in torque, causing the engine to stop completely and the piston and cylinder to deteriorate.

Abstract

The invention concerns a method for controlling the oil flow rate injected in a two-stroke internal combustion engine wherein oil is injected independently of fuel. The invention is characterised in that it consists in controlling the oil on the basis of a temperature representing the engine heat load. More precisely said temperature can be that of an element constituting the engine, such as a spark plug gasket.

Description

PROCEDE DE CONTROLE DU DEBIT D'HUILE DANS UN MOTEUR DEUX TEMPS A GRAISSAGE SEPARE ET UN MOTEUR ASSOCIEMETHOD FOR CONTROLLING THE OIL FLOW IN A SEPARATE LUBRICATION TWO-STROKE ENGINE AND A RELATED ENGINE
La présente invention concerne le domaine des moteurs à combustion interne à deux temps dans lesquels l'huile est injectée indépendamment de l'essence. Ces moteurs sont encore appelés moteurs à graissage séparé.The present invention relates to the field of two-stroke internal combustion engines in which the oil is injected independently of the petrol. These motors are also called separate lubrication motors.
Plus précisément la présente invention a trait au contrôle du débit, ou dosage, de l'huile injectée dans ce type de moteurs.More specifically, the present invention relates to controlling the flow rate, or metering, of the oil injected into this type of engine.
Les systèmes connus de dosage d'huile comprennent généralement une pompe-doseuse mécanique commandée en fonction de paramètres tels que le régime et/ou la position du papillon des gaz, ce dernier paramètre étant représentatif de la charge du moteur.Known oil metering systems generally comprise a mechanical metering pump controlled as a function of parameters such as the speed and / or the position of the throttle valve, this latter parameter being representative of the engine load.
Ces paramètres, couramment utilisés pour commander le dosage de l'huile, présentent cependant quelques inconvénients, particulièrement dans le cas des moteurs refroidis par air. Ils ne permettent pas, notamment, d'assurer un bon dosage quel que soit la charge et/ou le régime du moteur. En particulier, le dosage est inadapté lorsque le niveau thermique du moteur varie : pendant l'ascension d'une forte côte ou lors d'une défaillance du circuit de refroidissement par exemple.These parameters, commonly used to control the metering of the oil, however have some drawbacks, particularly in the case of air-cooled engines. They do not, in particular, ensure a good dosage regardless of the load and / or the engine speed. In particular, the dosage is unsuitable when the thermal level of the engine varies: during the ascent of a steep hill or during a failure of the cooling circuit for example.
Des améliorations ont donc déjà été proposées comme par exemple dans la demande de brevet EP-A1 -0577081. Selon ce document, on peut réajuster la quantité d'huile injectée en fonction de seuils mémorisés dans un calculateur ; on peut aussi faire varier le temps entre deux injections.Improvements have therefore already been proposed, for example in patent application EP-A1 -0577081. According to this document, we can readjust the quantity of oil injected as a function of thresholds stored in a computer; you can also vary the time between two injections.
Cette solution technologique est avant tout fondée sur les valeurs de charge et de vitesse du moteur.This technological solution is above all based on the load and speed values of the engine.
La présente invention procède d'un choix technique différent. En effet la présente invention propose de baser le contrôle du débit d'huile sur la température d'un élément du moteur représentatif du niveau de charge thermique du moteur.The present invention proceeds from a different technical choice. In fact, the present invention proposes to base the control of the oil flow on the temperature of an element of the engine representative of the level of thermal load of the engine.
Cette solution permet de réaliser un dosage fiable et précis, qui par une meilleure gestion, permet de réduire notablement la consommation d'huile, de l'ordre de 30% à 50%.This solution makes it possible to carry out a reliable and precise dosage, which by better management, makes it possible to significantly reduce oil consumption, of the order of 30% to 50%.
Le risque de détérioration du moteur peut être très important en cas de défectuosité du système de refroidissement ou en cas de surchauffe importante.The risk of engine damage can be very significant in the event of a fault in the cooling system or in the event of significant overheating.
Pour résoudre ce type de problèmes, les systèmes de lubrification actuels sont conçus pour garantir une marge de sécurité en cas de surchauffe importante du moteur (montée d'une longue côte par exemple).To solve this type of problem, current lubrication systems are designed to guarantee a margin of safety in the event of significant overheating of the engine (climbing a long hill for example).
Ces réglages entraînent donc une surconsommation d'huile lorsque le moteur fonctionne dans des conditions normales, moins sévères car la marge de sécurité existe quelles que soient les conditions de fonctionnement.These adjustments therefore lead to an overconsumption of oil when the engine is operating under normal conditions, less severe since the safety margin exists whatever the operating conditions.
Il y a actuellement peu de systèmes capables d'optimiser réellement la consommation d'huile.There are currently few systems capable of really optimizing oil consumption.
De plus, comme souligné plus haut, les systèmes les plus performants fonctionnent en fonction de paramètres tels que charge et/ou vitesse du moteur. Vis-à-vis de ces techniques connues, la présente invention permet de résoudre les problèmes évoqués ci-dessus, notamment ceux liés à la surchauffe du moteur et à la trop forte consommation d'huile.In addition, as pointed out above, the most efficient systems operate according to parameters such as load and / or engine speed. With respect to these known techniques, the present invention makes it possible to solve the problems mentioned above, in particular those linked to the overheating of the engine and the excessive consumption of oil.
Ainsi la présente invention a pour objet un procédé de contrôle du débit d'huile de lubrification d'un moteur à combustion interne à deux temps comportant un circuit d'injection d'huile de lubrification, qui consiste à agir sur le débit d'huile de lubrification en fonction d'une température représentative de la charge thermique du moteur.Thus the subject of the present invention is a method for controlling the flow of lubricating oil of a two-stroke internal combustion engine comprising a circuit for injecting lubricating oil, which consists in acting on the oil flow lubrication as a function of a temperature representative of the engine thermal load.
Plus précisément, la température représentative de la charge thermique est la température d'un élément constituant ledit moteur.More specifically, the temperature representative of the thermal load is the temperature of an element constituting said motor.
Conformément à l'invention, le moteur comporte un élément d'allumage muni d'un joint.According to the invention, the engine comprises an ignition element provided with a seal.
En accord avec ce mode de réalisation de l'invention, la température représentative de la charge thermique du moteur est la température dudit joint.In accordance with this embodiment of the invention, the temperature representative of the thermal load of the engine is the temperature of said seal.
Sans sortir du cadre de l'invention, la température représentative de la charge thermique du moteur est la température de l'élément d'allumage.Without departing from the scope of the invention, the temperature representative of the thermal load of the engine is the temperature of the ignition element.
De façon particulière, l'on augmente le débit d'huile de lubrification injectée dans le moteur lorsque la température représentative de la charge thermique du moteur dépasse une valeur de seuil prédéterminée.In particular, the flow rate of lubricating oil injected into the engine is increased when the temperature representative of the engine thermal load exceeds a predetermined threshold value.
Par ailleurs, lorsque le circuit d'injection d'huile comporte un circuit de fuite, l'action sur le débit d'huile de lubrification peut être obtenue en contrôlant la fermeture dudit circuit de fuite.Furthermore, when the oil injection circuit includes a leak circuit, the action on the lubrication oil flow can be obtained by controlling the closing of said leak circuit.
Additionnellement, on agit sur le débit d'huile en fonction de la charge mécanique et/ou du régime du moteur. L'invention vise en outre un moteur à combustion interne à deux temps comprenant un circuit d'injection d'un débit d'huile de lubrification.Additionally, one acts on the oil flow depending on the mechanical load and / or the engine speed. The invention further relates to a two-stroke internal combustion engine comprising a circuit for injecting a flow of lubricating oil.
De façon caractéristique, le moteur comprend :Typically, the engine includes:
- un capteur de mesure d'une température représentative de la charge thermique dudit moteur qui délivre sur une sortie un signal représentatif de ladite température,a sensor for measuring a temperature representative of the thermal load of said motor which delivers a signal representative of said temperature to an output,
- un module dé traitement dudit signal, muni d'une entrée raccordée à la sortie du capteur de mesure de ladite température et d'une sortie qui délivre un signal de commande,a module for processing said signal, provided with an input connected to the output of the sensor for measuring said temperature and with an output which delivers a control signal,
- des moyens de réglage du débit d'huile de lubrification, munis d'une entrée raccordée à la sortie du module de traitement,- means for adjusting the lubrication oil flow rate, provided with an inlet connected to the outlet of the treatment module,
lesdits moyens de réglage réagissant au signal de commande élaboré par le module de traitement de manière à ce que le débit d'huile de lubrification soit modifié en fonction d'une température représentative de la charge thermique du moteur, mesurée par ledit capteur de température qui est disposé sur un élément constitutif dudit moteur.said adjustment means reacting to the control signal produced by the processing module so that the flow rate of lubricating oil is modified as a function of a temperature representative of the thermal load of the engine, measured by said temperature sensor which is disposed on a component of said motor.
Selon un mode de réalisation de l'invention, le moteur est refroidi par air et comprend un élément d'allumage muni d'un joint, le capteur de mesure de la température représentative de la charge thermique du moteur est alors disposé sur ledit joint.According to one embodiment of the invention, the engine is air cooled and comprises an ignition element provided with a seal, the sensor for measuring the temperature representative of the thermal load of the engine is then placed on said seal.
Le moteur, selon l'invention comprenant un élément d'allumage , le capteur de mesure de la température est disposé sur ledit élément d'allumage.The engine according to the invention comprising an ignition element, the temperature measurement sensor is disposed on said ignition element.
En outre, le moteur selon l'invention peut comprendre un capteur de mesure de la charge et/ou un capteur de mesure du régime dudit moteur, la sortie de chacun d'eux étant raccordée à une entrée dudit module de traitement de manière à ce que le débit d'huile de lubrification soit en outre modifié en fonction de la charge et/ou du régime du moteur.In addition, the engine according to the invention may comprise a load measurement sensor and / or a speed measurement sensor of said engine, the output of each of them being connected to an input of said module. treatment so that the flow of lubricating oil is further modified according to the load and / or the engine speed.
La présente invention sera mieux comprise, d'autres éléments, détails et caractéristiques apparaîtront plus clairement à la lecture de la description qui va suivre, faite à titre illustratif et nullement limitatif en référence aux figures annexées :The present invention will be better understood, other elements, details and characteristics will appear more clearly on reading the description which follows, given by way of illustration and in no way limiting with reference to the appended figures:
- La figure 1 est un schéma montrant les principaux éléments nécessaires à la mise en œuvre de l'invention; et- Figure 1 is a diagram showing the main elements necessary for the implementation of the invention; and
- La figure 2 montre un ensemble de courbes du couple-moteur en fonction de la température d'un élément caractéristique du moteur.- Figure 2 shows a set of engine torque curves as a function of the temperature of a characteristic element of the engine.
La figure 1 montre un moteur 1 deux temps refroidi par air, avec un conduit arrivée d'huile 2. Le débit d'huile sur cette arrivée est commandé par un élément 3 tel qu'une vanne actionnée par un solénoïde.FIG. 1 shows an air-cooled two-stroke engine 1 with an oil inlet pipe 2. The flow of oil on this inlet is controlled by an element 3 such as a valve actuated by a solenoid.
De façon classique un réservoir d'huile 4 et une pompe 5 constituent l'alimentation d'huile contrôlée par le solénoïde 3.Conventionally, an oil tank 4 and a pump 5 constitute the oil supply controlled by the solenoid 3.
L'arrivée d'essence, non représentée sur la figure 1 , est prévue séparément de l'arrivée d'huile 2.The fuel inlet, not shown in FIG. 1, is provided separately from the oil inlet 2.
Dans le système présenté sur la figure 1 , le débit d'huile sortant de la pompe 5 est divisé en deux conduits : le conduit 2 d'alimentation principale du moteur et un conduit 10 de by-pass où une partie de l'huile est recyclée en amont de la pompe 5. Il est préférable d'insérer un clapet anti-retour 6 dans le conduit de by-pass 10.In the system presented in FIG. 1, the oil flow leaving the pump 5 is divided into two conduits: the main motor supply conduit 2 and a bypass conduit 10 where part of the oil is recycled upstream of the pump 5. It is preferable to insert a non-return valve 6 in the by-pass duct 10.
Un deuxième clapet anti-retour 11 peut aussi être implanté sur le conduit principal 2, près de l'entrée d'huile du moteur pour éviter en particulier l'alimentation en huile du moteur pendant son arrêt. Le tarage du deuxième clapet 11 est alors fonction du tarage du clapet 6. Les conduits d'alimentation principale 2 et de by-pass 10 seront dimensionnés de façon à délivrer un débit minimum requis par le moteur lorsque le conduit de by-pass 10 est ouvert, et un débit maximum requis par le moteur lorsque le conduit de by-pass 10 est fermé.A second non-return valve 11 can also be installed on the main conduit 2, near the engine oil inlet to avoid in particular the supply of engine oil during its stop. The calibration of the second valve 11 is then a function of the calibration of the valve 6. The main supply 2 and bypass ducts 10 will be dimensioned so as to deliver a minimum flow rate required by the motor when the bypass duct 10 is open, and a maximum flow rate required by the motor when the bypass duct -pass 10 is closed.
Dans le cas d'un système simple, le solénoïde 3 pourra commander l'ouverture tout ou rien du conduit 10 de by-pass, autorisant soit un débit mini (conditions normales ; by-pass ouvert) soit un débit maxi (conditions de surcharge thermique ; by-pass fermé).In the case of a simple system, the solenoid 3 can command the all-or-nothing opening of the by-pass duct 10, allowing either a minimum flow (normal conditions; open by-pass) or a maximum flow (overload conditions thermal; bypass closed).
Dans le cas d'un système plus sophistiqué, le solénoïde 3 pourra se déplacer de façon progressive (ou selon une fréquence variable) et entraîner un système de fermeture partielle et variable du conduit 10 de by-pass : par exemple à l'aide d'une aiguille de section variable.In the case of a more sophisticated system, the solenoid 3 can move gradually (or according to a variable frequency) and cause a partial and variable closure system of the bypass duct 10: for example using d '' a needle of variable section.
L'ouverture du conduit 10 se fera ainsi au fur et à mesure de l'augmentation de la charge thermique du moteur, permettant ainsi une augmentation progressive du débit d'huile dans ledit conduit 10.The opening of the conduit 10 will thus take place as the thermal load of the engine increases, thereby allowing a gradual increase in the oil flow rate in said conduit 10.
Une unité de calcul électronique 7 peut être avantageusement prévue afin notamment de contrôler le solénoïde 3. L'unité 7 est en outre reliée à un élément représentatif de la charge thermique du moteur tel que la bougie d'allumage ou plus précisément à un capteur de température 8 placé sur le joint de bougie 12.An electronic calculation unit 7 can advantageously be provided in order in particular to control the solenoid 3. The unit 7 is also connected to an element representative of the thermal load of the engine such as the spark plug or more precisely to a sensor of temperature 8 placed on the spark plug seal 12.
Selon l'invention, le capteur 8 fournit en permanence la température du joint de bougie à l'unité de calcul 7 qui elle-même et, en fonction notamment de la température fournie, commande le solénoïde 3 de la façon indiquée ci-avant.According to the invention, the sensor 8 permanently supplies the temperature of the spark plug seal to the calculation unit 7 which itself and, in particular as a function of the temperature supplied, controls the solenoid 3 in the manner indicated above.
La pompe à huile 5 peut en outre être reliée à une poulie 9 elle-même reliée au papillon des gaz. Ce système permet de contrôler le débit via la charge du moteur. Il n'est pas nécessaire à la mise en œuvre de l'invention. C'est un élément additionnel qui peut permettre d'améliorer le contrôle du débit via la température.The oil pump 5 can also be connected to a pulley 9 which is itself connected to the throttle valve. This system makes it possible to control the flow rate via the engine load. It is not necessary for the implementation of the invention. It is an additional element that can improve flow control via temperature.
Cet élément additionnel peut s'avérer utile en cas de défaillance du système de contrôle lié à la température. Il peut ainsi être considéré comme un élément redondant.This additional element can be useful in the event of a temperature control system failure. It can thus be considered as a redundant element.
Le contrôle du débit d'huile par l'unité 7 peut être envisagé via un capteur de température représentatif du niveau de charge thermique du moteur. Ainsi dans le cas d'un moteur à refroidissement liquide, un capteur de température du liquide de refroidissement peut permettre ce contrôle. Sans sortir du cadre de l'invention, un capteur de température de la chemise, du carter, ou de l'échappement peut aussi être prévu, en particulier dans le cas d'un moteur à refroidissement par air.The control of the oil flow by the unit 7 can be envisaged via a temperature sensor representative of the level of thermal load of the engine. Thus in the case of a liquid-cooled engine, a coolant temperature sensor can allow this control. Without departing from the scope of the invention, a temperature sensor for the jacket, the casing or the exhaust can also be provided, in particular in the case of an air-cooled engine.
Dans tous les cas, le principe est le même ; il s'agit de corriger et/ou de contrôler le débit d'huile en fonction de la température d'un élément représentatif de la charge thermique du moteur.In all cases, the principle is the same; this involves correcting and / or controlling the oil flow as a function of the temperature of an element representative of the engine thermal load.
Lorsque la charge thermique augmente, le débit d'huile est corrélativement augmenté. Un seuil de température, mémorisé dans l'unité 7, détermine le moment où le débit doit être modifié.When the thermal load increases, the oil flow is correspondingly increased. A temperature threshold, memorized in unit 7, determines the moment when the flow rate must be modified.
Ainsi la présente invention permet une meilleure gestion du débit d'huile, c'est-à-dire finalement une réduction de la consommation.Thus the present invention allows better management of the oil flow, that is to say ultimately a reduction in consumption.
Par ailleurs la mise en œuvre de la présente invention étant directement liée à la température du moteur, une défaillance du système de refroidissement est ainsi immédiatement prise en compte et remédiée. En effet dès que la température du moteur augmente, le débit d'huile est lui aussi augmenté, ce qui peut éviter la casse du moteur.Furthermore, since the implementation of the present invention is directly linked to the temperature of the engine, a failure of the cooling system is thus immediately taken into account and remedied. As soon as the engine temperature rises, the oil flow is also increased, which can avoid engine breakage.
Des témoins ou autres moyens peuvent d'ailleurs être prévus afin d'alerter le conducteur dès l'origine du problème. La figure 2 permet de mieux appréhender le problème à l'origine de l'invention.Witnesses or other means may also be provided to alert the driver from the origin of the problem. Figure 2 provides a better understanding of the problem at the origin of the invention.
Cette figure montre un ensemble de courbes (A, B, C) du couple C en fonction de la température T d'un élément caractéristique de la température du moteur, ici la température du joint de bougie, pour différents rapports massiques essence/huile de lubrification.This figure shows a set of curves (A, B, C) of the torque C as a function of the temperature T of an element characteristic of the engine temperature, here the temperature of the spark plug seal, for different gasoline / oil mass ratios. lubrication.
Ces courbes font notamment apparaître une chute brutale du couple à partir d'une certaine température du moteur, température caractéristique du serrage du moteur.These curves show in particular a sudden drop in torque from a certain temperature of the engine, a temperature characteristic of the engine being tightened.
La lubrification d'un moteur est donc directement liée aux problèmes de serrage qui apparaissent dans le moteur dès que la lubrification est insuffisante et qu'il se produit une rupture du film d'huile. Les problèmes de serrage sont aussi liés au niveau de charge thermique du moteur et principalement à la température du piston. Ainsi plus le moteur est chaud et plus les risques de serrage (donc de détérioration du moteur) sont importants. Parallèlement plus la quantité de lubrifiant introduit est faible (rapport essence/lubrifiant élevé), plus le serrage apparaît à basse température.The lubrication of an engine is therefore directly linked to the tightening problems which appear in the engine as soon as the lubrication is insufficient and a rupture of the oil film occurs. Tightening problems are also linked to the thermal load level of the engine and mainly to the temperature of the piston. The warmer the engine, the greater the risk of tightening (and therefore of engine deterioration). At the same time, the lower the quantity of lubricant introduced (high fuel / lubricant ratio), the more the tightening appears at low temperature.
Le serrage est caractérisé par la chute brutale du couple entraînant l'arrêt complet du moteur et la détérioration du piston et du cylindre.Tightening is characterized by the sudden drop in torque, causing the engine to stop completely and the piston and cylinder to deteriorate.
Comme on peut le voir sur la figure 2, le serrage apparaît vers 200°C pour un rapport essence/huile de 400:1 (courbe A) alors qu'il apparaît à 260°C si le rapport essence/huile diminue à 100 : 1 (courbe C).As can be seen in Figure 2, the tightening appears at around 200 ° C for a petrol / oil ratio of 400: 1 (curve A) whereas it appears at 260 ° C if the petrol / oil ratio decreases to 100: 1 (curve C).
Le serrage apparaît vers 225°C lorsque le rapport essence/huile est de 200 : 1 (courbe B). On voit ainsi l'intérêt de l'invention qui, en augmentant le débit d'huile lorsque la charge thermique augmente, assure une lubrification optimale quelles que soient les conditions de fonctionnement du moteur. The tightening appears around 225 ° C when the petrol / oil ratio is 200: 1 (curve B). This shows the advantage of the invention which, by increasing the oil flow when the thermal load increases, ensures optimal lubrication whatever the operating conditions of the engine.

Claims

REVENDICATIONS
1 ) Procédé de contrôle du débit d'huile de lubrification d'un moteur (1 ) à combustion interne à deux temps comportant un circuit (2-5) d'injection d'huile de lubrification, consistant à agir sur le débit d'huile de lubrification en fonction d'une température représentative de la charge thermique dudit moteur, caractérisé en ce que la température représentative de la charge thermique est la température d'un élément constituant ledit moteur (1).1) Method for controlling the flow of lubricating oil from a two-stroke internal combustion engine (1) comprising a circuit (2-5) for injecting lubricating oil, consisting in acting on the flow of lubricating oil as a function of a temperature representative of the thermal load of said motor, characterized in that the temperature representative of the thermal load is the temperature of an element constituting said motor (1).
2) Procédé selon la revendication 1 , le moteur comportant un élément d'allumage muni d'un joint (12), caractérisé en ce que la température représentative de la charge thermique du moteur (1 ) est la température dudit joint (12).2) Method according to claim 1, the engine comprising an ignition element provided with a seal (12), characterized in that the temperature representative of the thermal load of the engine (1) is the temperature of said seal (12).
3) Procédé selon la revendication 1 , le moteur comportant un élément d'allumage caractérisé en ce que la température représentative de la charge thermique du moteur (1) est la température de l'élément d'allumage.3) Method according to claim 1, the engine comprising an ignition element characterized in that the temperature representative of the thermal load of the engine (1) is the temperature of the ignition element.
4) Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le débit d'huile de lubrification est augmenté quand la température représentative de la charge thermique du moteur dépasse une valeur de seuil prédéterminée.4) Method according to any one of claims 1 to 3, characterized in that the lubrication oil flow is increased when the temperature representative of the thermal load of the engine exceeds a predetermined threshold value.
5) Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le circuit (2-5) d'injection d'huile de lubrification comporte un circuit de fuite, l'action sur le débit d'huile de lubrification est obtenue en contrôlant la fermeture dudit circuit de fuite.5) Method according to any one of claims 1 to 4, characterized in that the circuit (2-5) of lubricating oil injection comprises a leak circuit, the action on the flow of lubricating oil is obtained by controlling the closing of said leak circuit.
6) Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce qu'il consiste en outre à agir sur le débit d'huile en fonction de la charge mécanique et/ou du régime du moteur. 7) Moteur à combustion interne à deux temps comprenant un circuit d'injection d'un débit d'huile de lubrification caractérisé en ce qu'il comprend :6) Method according to any one of claims 1 to 5, characterized in that it further consists in acting on the oil flow according to the mechanical load and / or the engine speed. 7) Two-stroke internal combustion engine comprising a circuit for injecting a flow of lubricating oil, characterized in that it comprises:
- un capteur (8) de mesure d'une température représentative de la charge thermique dudit moteur (1) qui délivre sur une sortie un signal représentatif de ladite température,a sensor (8) for measuring a temperature representative of the thermal load of said motor (1) which delivers a signal representative of said temperature to an output,
- un module (7) de traitement dudit signal, muni d'une entrée raccordée à la sortie du capteur de mesure de ladite température et d'une sortie qui délivre un signal de commande,a module (7) for processing said signal, provided with an input connected to the output of the sensor for measuring said temperature and with an output which delivers a control signal,
- des moyens (3) de réglage du débit d'huile de lubrification, munis d'une entrée raccordée à la sortie du module de traitement,- means (3) for adjusting the lubrication oil flow rate, provided with an inlet connected to the outlet of the processing module,
lesdits moyens (3) de réglage réagissant au signal de commande élaboré par le module (7) de traitement de manière à ce que le débit d'huile de lubrification soit modifié en fonction d'une température représentative de la charge thermique du moteur mesurée par ledit capteur (8) disposé sur un élément constitutif dudit moteur.said adjustment means (3) reacting to the control signal produced by the processing module (7) so that the flow rate of lubricating oil is modified as a function of a temperature representative of the thermal load of the engine measured by said sensor (8) disposed on a component of said motor.
8) Moteur selon la revendication 7, refroidi par air et comprenant un élément d'allumage muni d'un joint (12), caractérisé en ce que le capteur de mesure de la température représentative de la charge thermique du moteur est disposé sur ledit joint (12).8) Engine according to claim 7, air cooled and comprising an ignition element provided with a seal (12), characterized in that the temperature measurement sensor representative of the thermal load of the engine is disposed on said seal (12).
9) Moteur selon la revendication 7 comprenant un élément d'allumage, caractérisé en ce que le capteur de mesure de la température est disposé sur l'élément d'allumage.9) Engine according to claim 7 comprising an ignition element, characterized in that the temperature measurement sensor is arranged on the ignition element.
10) Moteur selon l'une quelconque des revendications 7 à 9, caractérisé en ce qu'il comprend en outre un capteur de mesure de la charge et/ou un capteur de mesure du régime dudit moteur, la sortie de chacun d'eux étant raccordée à une entrée dudit module (7) de traitement de manière à ce que le débit d'huile de lubrification soit en outre modifié en fonction de la charge et/ou du régime du moteur (1). 10) Engine according to any one of claims 7 to 9, characterized in that it further comprises a load measurement sensor and / or a speed measurement sensor of said engine, the output of each of them being connected to an input of said module (7) for processing so that the lubrication oil flow is further modified according to the load and / or the engine speed (1).
EP98955711A 1997-11-21 1998-11-20 Method for controlling oil flow rate in a two-stroke engine with separate lubrication and related engine Expired - Lifetime EP0958448B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9714752A FR2771448B1 (en) 1997-11-21 1997-11-21 METHOD FOR CONTROLLING THE OIL FLOW IN A SEPARATE LUBRICATION TWO-STROKE ENGINE AND A RELATED ENGINE
FR9714752 1997-11-21
PCT/FR1998/002488 WO1999027236A1 (en) 1997-11-21 1998-11-20 Method for controlling oil flow rate in a two-stroke engine with separate lubrication and related engine

Publications (2)

Publication Number Publication Date
EP0958448A1 true EP0958448A1 (en) 1999-11-24
EP0958448B1 EP0958448B1 (en) 2003-09-03

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EP98955711A Expired - Lifetime EP0958448B1 (en) 1997-11-21 1998-11-20 Method for controlling oil flow rate in a two-stroke engine with separate lubrication and related engine

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US (1) US6283072B1 (en)
EP (1) EP0958448B1 (en)
JP (1) JP2001513164A (en)
AR (1) AR017656A1 (en)
BR (1) BR9807109A (en)
DE (1) DE69817767T2 (en)
ES (1) ES2207009T3 (en)
FR (1) FR2771448B1 (en)
TW (1) TW432154B (en)
WO (1) WO1999027236A1 (en)

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US7953541B2 (en) * 2008-07-31 2011-05-31 General Electric Company Method and system for reducing unburned fuel and oil from exhaust manifolds
US8831858B2 (en) 2008-07-31 2014-09-09 General Electric Company Methods and systems for operating an engine
ITMI20120003U1 (en) * 2012-01-05 2013-07-06 Piaggio & C Spa "INTEGRATED IGNITION AND POWER SUPPLY SYSTEM FOR INTERNAL COMBUSTION ENGINES"
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ES2207009T3 (en) 2004-05-16
FR2771448A1 (en) 1999-05-28
DE69817767D1 (en) 2003-10-09
TW432154B (en) 2001-05-01
EP0958448B1 (en) 2003-09-03
FR2771448B1 (en) 1999-12-31
US6283072B1 (en) 2001-09-04
DE69817767T2 (en) 2004-03-18
WO1999027236A1 (en) 1999-06-03
BR9807109A (en) 2000-04-25
JP2001513164A (en) 2001-08-28
AR017656A1 (en) 2001-09-12

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