• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:FR3017652A1
    申请号:FR1451313
    申请日:2014-02-19
    公开日:2015-08-21
    发明作者:Cyril Bastian；Matthieu Fuin
    申请人:Peugeot Citroen Automobiles SA；
    IPC主号:
    专利说明:

    [0001] The invention relates to a method for controlling the viscosity of the lubricating oil of a heat engine as well as to a lubrication device. by oil of a heat engine for the implementation of such a method. Such a method of controlling the viscosity of the lubricating oil of a heat engine can limit the risk of failure in extreme operating conditions of the engine. Indeed, the viscosity of the oil is affected by certain operating parameters of the engine, such as for example a significant dilution due to the regeneration of the particulate filter in the exhaust line of the engine, the high content in carbonaceous materials due to the modes of combustion, this being particularly relevant for engines of the Diesel type, and the engine temperature which can be high under certain conditions of heavy loading, especially in long rise, towing, etc. [0004] Regulations in terms of reducing CO2 emissions and fuel consumption are becoming more severe. In this context, the engine lubricating oil plays an important role because its formulation directly impacts the internal friction of the engine and, consequently, the performance of the vehicle's drivetrain, hence the fuel consumption and fuel consumption. emission of harmful gases for the environment in the case of poor combustion of the engine. One of the ways to reduce mechanical friction is to reduce the viscosity of the oil. Indeed, in order to protect the engine for the most severe operating modes, it is important to control the viscosity of the oil under unfavorable operating conditions, in particular and without being limiting, a significant dilution due to regenerations. particulate filter provided in the exhaust line of the engine, a high carbon content due to combustion modes, especially for a diesel engine, and a high engine temperature that can occur for example in high load conditions, including long climb, towing etc. So far no viable solution has been proposed for the protection of a heat engine by controlling the viscosity of its lubricating oil. For example, document FR-A-2 816 354 proposes to improve the lubrication of a heat engine, knowing that a lubricating oil only ensures its effectiveness when it reaches an optimum predetermined temperature for its operation. operation. For this, this document proposes to separate the oil tank into two communicating compartments: a small compartment of small capacity which contains a fraction of the oil to ensure the lubrication of the engine and a large compartment of large capacity which contains a reserve oil. A valve sensitive to the temperature of the oil in the small compartment is mounted through the separation between the two compartments to close or open the communication between the small compartment and the large compartment depending on whether the temperature of the oil is lower or respectively greater than a determined threshold. If such a device described in this document promotes the rise in temperature of the lubricating oil after cold start of the engine, it is however not able to provide a control of the viscosity of the lubricating oil for all conditions of operation of the vehicle, this solution only applies to the starting of the vehicle when the lubricating oil is cold. Therefore, the problem underlying the invention is to control the viscosity of the lubricating oil of a heat engine in all operating conditions of the motor vehicle equipped with the heat engine. To achieve this objective, there is provided according to the invention a method for controlling the viscosity of the lubricating oil of a heat engine, the viscosity of the oil may be affected by one or more operating parameters of the engine according to the values that these parameters take, the lubricating oil being contained in a main tank and in an additional tank, a first passage to the main tank starting from the additional tank being provided by having a selective means of opening or closure method, which method comprises the steps of: - detecting or estimating a value of at least one operating parameter of the engine that can affect the viscosity of the oil, - when detecting or estimating such an value, control of the opening of the passage of the additional tank towards the main tank so that the oil contained in the additional tank can feed the re main tank. The technical effect is to obtain a very fast and automatic correction during an alteration of the viscosity of the lubricating oil. Advantageously, account is taken of the detection or estimation of a value of a relative operating parameter at the level of filling of the oil in the main tank as a control parameter, the passage between the additional tank and the main tank being closed when this value is representative of a maximum filling level in the main tank. Advantageously, the operating parameters of the engine that can affect the viscosity of the oil are the dilution ratio of the oil, the amount of carbonaceous material in the oil and the temperature of the oil. Advantageously, the control of the opening of the first passage of the additional reservoir to the main reservoir is considered simultaneously with at least two of said three operating parameters. Advantageously, the detected or estimated value of at least one operating parameter of the engine that can affect the viscosity of the oil is corrected according to a factor taking into account the detection or estimation of the instantaneous temperature and the average oil temperature. Advantageously, the detection or estimation of the value of at least one operating parameter of the engine that can affect the viscosity of the oil is carried out in real time. The invention also relates to an oil lubrication device of a heat engine for the implementation of such a method, the device comprising a main reservoir and an additional reservoir for the lubricating oil, a circuit of supplying the lubricating oil from the main reservoir to the engine, characterized in that it comprises a first conduit for the passage of the lubricating oil from the additional reservoir to the main reservoir, the first conduit comprising a means selective opening or closing, the device further comprising means for detecting or estimating a value of at least one operating parameter of the engine that can affect the viscosity of the oil. Advantageously, there is provided means for detecting or estimating the oil level in the main tank. Advantageously, there is provided a central control unit for controlling the opening or closing of the selective opening or closing means for the passage of the oil through the first pipe according to said at least one a detected or estimated value and, if applicable, the oil level in the main tank. Advantageously, there is provided a second conduit for the passage of the lubricating oil from the main reservoir to the additional reservoir and the return of the oil in the additional reservoir, the second conduit having its own selective means of opening or closing. Other features, objects and advantages of the present invention will appear on reading the detailed description which follows and with reference to the accompanying drawings given by way of non-limiting examples and in which: - Figure 1 is a schematic representation of an oil lubrication device of a heat engine that can be used for carrying out a control method for controlling the viscosity of the oil according to the present invention, - Figure 2 is a schematic representation. two curves of the percentage of dilution and of carbonaceous materials of a thermal engine lubrication oil as a function of the mileage of a motor vehicle, with each curve being associated a specific control parameter, - Figure 3 is a diagrammatic representation of the curve of the quantity of lubricating oil in an oil tank according to the mileage of a motor vehicle, with mention of a maximum amount of oil in the tank. Referring to Figure 1, the present invention relates to an oil lubrication device of a heat engine 1 for the implementation of a method for controlling the viscosity of the lubricating oil of a heat engine 1, the viscosity of the oil can be affected by one or more engine operating parameters according to the values that take these parameters. In accordance with the method according to the present invention, the lubricating oil is contained in a main reservoir 2 and in an additional reservoir 3 of the lubrication device, a non-limiting embodiment of which is shown in FIG. 1. [0025] It is provided, advantageously in the form of a first pipe 4, a first passage to the main tank 2 starting from the additional tank 3. This first pipe 4 has a selective means of opening or closing 5, advantageously in the form of a valve. The method for controlling the viscosity according to the present invention comprises the following steps: detection or estimation of a value of at least one operating parameter of the engine 1 which can affect the viscosity of the oil, detecting or estimating such a value, controlling the opening of the passage of the additional tank 3 to the main tank 2 so that oil contained in the additional tank 3 can feed the main tank 2. [0027] Thus, the strategy underlying the present invention is to release all or part of the additional oil volume in the additional reservoir 3 of the device when one or more operating parameters that can affect the viscosity take values negatively affecting the viscosity of the lubricating oil. It can be taken into account the detection or estimation of a value of an operating parameter relative to the filling level of the oil in the main tank 2 as a control parameter. In this case, the passage through the first pipe 4 between the additional tank 3 and the main tank 2 being closed when this value of the control parameter is representative of a maximum filling level in the main tank 2. [0029] For this , there is provided means for detecting or estimating the oil level in the main tank 2, as a process control parameter, the oil level to be less than a predetermined maximum oil level. Without this being limiting, the operating parameters of the engine 1 that can affect the viscosity of the oil may be the oil dilution ratio, the amount of carbonaceous material in the oil and the temperature of the oil. oil. Only one of these parameters may be considered as one or more of these parameters. The activation thresholds may take interdependent values depending on the operating conditions of the engine. For example, the opening of the first pipe 4 and the supply of the main tank 2 with oil from the additional tank 3 may occur earlier in a life situation of high dilution associated with a high oil temperature. These parameter values can be corrected by the acquisition or estimation of other parameters. For example, an instantaneous oil temperature and the calculation of the average temperature may be additional correction parameters by which it is possible to review, in particular downward, the trigger points of the oil viscosity control process. Thus, the detected or estimated value of at least one operating parameter of the engine 1 that can affect the viscosity of the oil can be corrected according to a factor taking into account the detection or estimation of the instantaneous temperature and the temperature average oil. The control of the opening of the first line 4 of the additional reservoir 3 to the main reservoir 2 can therefore be considered simultaneously with at least two of said three operating parameters. Specific coefficients can also be assigned to the three engine operating parameters. The lubrication device also comprises, in the usual manner, a supply circuit 6 of the lubricating oil from the main tank 2 to the heat engine 1. This supply circuit comprises a pump 7 for the circulation of the lubricating oil between the main tank 2 and the engine 1 for engine lubrication. There may be provided a central control unit for controlling the opening or closing of the selective means 5 for the passage of oil through the first pipe 4 according to said at least one detected or estimated value and, if appropriate, the oil level in the main tank 2, the latter as a control parameter. This central control unit can be advantageously a motor control equipping most current vehicles. The parameters that can affect the viscosity of the lubricating oil can be monitored in real time in order to define, if necessary, the appropriate time for the release of the oil from the additional tank 3 with release of a quantity of oil required but not causing the maximum oil level in the main tank 2 to be exceeded. [0037] The lubricating device may be equipped with means for detecting one or more parameters affecting the viscosity of the lubricating oil, for example example of the sensors. Conversely, the values of one or more parameters can be estimated by the central control unit, advantageously the motor control, advantageously in real time. The engine control has for example at least one estimator of the dilution ratio, the rate of carbonaceous materials and the oil temperature. This or these estimators can therefore be used in the process according to the invention. In some cases, a thermocouple may be used for direct measurement of oil temperature values. This can also be done for other parameters that are risk parameters. Likewise, the engine control can estimate the quantity of oil present in the main tank 2 as a control parameter in order not to exceed a maximum level of lubricating oil in the main tank 2. [0039] It can be provided a second pipe 9 for the passage of the lubricating oil from the main tank 2 to the additional tank 3 and the return of the oil in the additional tank 3. The second pipe 9 advantageously comprises its own selective opening means or closure 10, advantageously in the form of a valve. The additional reservoir 3 may be initially filled with an oil whose physico-chemical characteristics may depend on the engine or the expected role. This additional reservoir 3 advantageously has a small footprint so that the lubrication device can be integrated in the under hood environment, preferably in place of a conventional lubrication device with a single tank.
    [0002] Its mass, as well as that of the oil that it contains, can be taken into account at the level of the power unit by the motor control. FIG. 2 illustrates an exemplary implementation of the method for controlling the viscosity of the lubricating oil of a heat engine according to the present invention. Figure 3 shows how the addition of oil to the main tank from the additional tank is controlled with respect to the control parameter so as not to exceed the maximum level of oil in the main tank. In these figures, the curves materialize the recording of the estimates made by the control unit, advantageously the engine control, parameters that can affect the viscosity of the oil, for FIG. 2, and the relative control parameter. at the level of the lubricating oil, for FIG. 3. In FIG. 2, the curve with the squares illustrates the percentage of dilution as a function of the mileage of the vehicle while the curve with the circles illustrates the percentage of materials. smoky according to mileage. Still in FIG. 2, the lines with diamonds and triangles, respectively, are the limits that must not be crossed for each of the parameters relating respectively to the dilution and to the carbonaceous materials, otherwise the engine will fail. These lines can be called dilution criteria or thresholds respectively of carbonaceous materials. At the highest point of the dilution curve with squares, referred to as A, the dilution estimated by the central control unit, advantageously the engine control, exceeds the tolerated dilution threshold illustrated by the rhombic line. This corresponds to the detection or estimation of a dilution value, as at least one operating parameter of the engine, which can affect the viscosity of the oil. According to the control method according to the invention, the opening of the opening or closing means of the first pipe of the additional tank is then triggered to allow the passage of oil from the additional tank to the main tank. In consideration of the control parameter and in order not to exceed the maximum oil level in the main tank, an appropriate amount of oil, for example 1.5 liters, is thus released from the additional tank to the main tank. Immediately after the release of this volume of oil, the dilution falls to a level below the threshold or dilution criterion. Mechanically, the content of carbonaceous materials illustrated by the curve with circles also decreases and reaches a low point of this curve, point B referenced in Figure 2. In Figure 3, the curve with squares illustrates the amount of carbon. oil in the main tank. This curve decreases gradually with the mileage of the vehicle thus showing a consumption of usual oil during the running of the vehicle, this according to the mileage achieved by the vehicle. The horizontal line with triangles indicates the maximum amount of oil that should not be exceeded in the main tank, as a previously mentioned control parameter. While in normal operation of the vehicle, the oil level drops regularly according to the oil consumption of the mileage traveled, the rise of the amount of oil is it a supplement of oil from the additional tank during a correction of the viscosity of the oil according to the process of the present invention. This booster, illustrated by the rise in the amount of oil at point C, is then again followed by a regular decay of the squared curve of the amount of oil in the main tank until the engine control signals the need for a drain, point D indicating the amount of oil present in the main tank when the need for a drain is reported. The driver then returns to the concession to perform the emptying of his vehicle, which is translated again by reaching the maximum amount of oil in the main tank and the superposition of the curve to squares of quantity of oil with the triangular line of maximum oil quantity. The reset of the maintenance counter can also reset the detectors and / or the estimators of the parameters that can affect the viscosity, in the non-limiting example of FIGS. 2 and 3, the dilution and the content of carbonaceous materials. In case of extra oil between two oil changes, which can be done by the driver himself, the addition of oil can be taken into account by the device if and only if the engine is equipped with a sufficiently precise electric oil gauge. If this is not the case, we may not consider this extra and the risk parameters will be overestimated. The control process will then act in an overprotective situation. For a first filling of the main oil tank, it can be carried out a "conventional" filling of the main tank, commonly by its filler cap. Then, it can be done filling the additional tank, either by gun or after mounting the vehicle, even after a first engine start, before delivery during the preparation of the new vehicle. For filling during maintenance, if no amount of oil has been brought from the additional tank to the main tank, the replacement of the oil contained in the additional tank and remaining there is not necessary to every annual interview. It may be considered a replacement of the additional reservoir oil to predetermined period, for example without being limiting every two to four years. This period may be dependent on several parameters, for example the position of the under-hood oil lubrication device, in particular with respect to the heat sources, the leakage of the device to external pollution and the manufacturer's after-sales strategy on the concerned vehicle. The invention is not limited to the described and illustrated embodiments which have been given only as examples.
    权利要求:
    Claims (10)
    [0001]
    1. A method for controlling the viscosity of the lubricating oil of a heat engine (1), the viscosity of the oil can be affected by one or more operating parameters of the engine according to the values that take these parameters , the lubricating oil being contained in a main reservoir (2) and in an additional reservoir (3), a first passage to the main reservoir (2) starting from the additional reservoir (3) being provided by presenting a selective means of opening or closing (5), which method has the following steps: - detection or estimation of a value of at least one operating parameter of the engine (1) which can affect the viscosity of the oil, - at the time of detecting or estimating such a value, controlling the opening of the passage of the additional reservoir (3) to the main reservoir (2) so that oil contained in the additional reservoir (3) can feed the main reservoir cipal (2).
    [0002]
    The method according to claim 1, wherein the detection or estimation of a value of an operating parameter relating to the filling level of the oil in the main tank (2) is taken into account as control parameter, the passage between the additional reservoir (3) and the main reservoir (2) being closed when this value is representative of a maximum filling level in the main reservoir (2).
    [0003]
    The method according to claim 1 or 2, wherein the operating parameters of the engine that can affect the viscosity of the oil are the oil dilution ratio, the amount of carbonaceous material in the oil and the temperature of the oil. 'oil.
    [0004]
    4. The method of claim 3, wherein the control of the opening of the first passage of the additional reservoir (3) to the main reservoir (2) is considered simultaneously with at least two of said three operating parameters.
    [0005]
    5. Method according to any one of the preceding claims, wherein the detected or estimated value of at least one operating parameter of the engine (1) that can affect the viscosity of the oil is corrected according to a factor taking into account the detection. or the estimation of the instantaneous temperature and the average oil temperature.
    [0006]
    The method of any of the preceding claims, wherein detecting or estimating the value of at least one engine operating parameter that can affect the viscosity of the oil is performed in real time.
    [0007]
    An oil lubrication device of a heat engine (1) for carrying out the method according to any one of the preceding claims, the device comprising a main reservoir (2) and an additional reservoir (3) for the lubricating oil, a supply circuit (6) of the lubricating oil from the main reservoir (2) to the heat engine (1), characterized in that it comprises a first pipe (4) for the passage of the lubricating oil from the additional reservoir (3) to the main reservoir (2), the first conduit (4) having a selective opening or closing means (5), the device further comprising detection or detection means estimating a value of at least one operating parameter of the engine that can affect the viscosity of the oil.
    [0008]
    8. Device according to claim 7, wherein there is provided means for detecting or estimating the oil level in the main tank (2).
    [0009]
    9. Device according to any one of claims 7 or 8, wherein there is provided a central control unit for controlling the opening or closing of the selective opening or closing means (5) for the passage oil through the first line (4) according to said at least one detected or estimated value and, if appropriate, the level of oil in the main tank (2).
    [0010]
    10. Device according to any one of claims 7 to 9, wherein there is provided a second pipe (9) for the passage of the lubricating oil from the main reservoir (2) to the additional reservoir (3) and returning the oil to the additional reservoir (3), the second conduit (9) having its own selective opening or closing means (10).
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    同族专利:
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    FR3017652B1|2016-03-04|
    引用文献:
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    EP3336324A1|2016-12-16|2018-06-20|RENAULT s.a.s.|System for controlling a lubricating circuit of an engine comprising a buffer tank|
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    FR3069015A1|2017-07-13|2019-01-18|Renault S.A.S|METHOD FOR MANAGING A DEVICE FOR LUBRICATING AN ENGINE|
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    法律状态:
    2015-02-20| PLFP| Fee payment|Year of fee payment: 2 |
    2016-01-21| PLFP| Fee payment|Year of fee payment: 3 |
    2017-12-01| ST| Notification of lapse|Effective date: 20171031 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1451313A|FR3017652B1|2014-02-19|2014-02-19|METHOD FOR CONTROLLING THE VISCOSITY OF THE LUBRICATING OIL OF A THERMAL ENGINE|FR1451313A| FR3017652B1|2014-02-19|2014-02-19|METHOD FOR CONTROLLING THE VISCOSITY OF THE LUBRICATING OIL OF A THERMAL ENGINE|
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