JP2007107394A - Oil consumption calculating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately calculate oil consumption in a lubricating system for an internal combustion engine without requiring an expensive oil level sensor. <P>SOLUTION: A unit time oil consumption calculating means M1a calculates an unit time oil consumption oci from the operated condition of the internal combustion engine. An integrating means M1b integrates the unit time oil consumption oci to calculates an oil consumption OCi. An integrated operation amount calculating means M2 calculates an integrated operation amount Dis of the internal combustion engine. An oil consumption correction coefficient calculating means M3 calculates an oil consumption correction coefficient K corresponding to the integrated operation amount. A correcting means M4 corrects the oil consumption OCi with the oil consumption correction coefficient K. Thus, considering a factor such as a revolution speed or a load corresponding to the operated condition of the internal combustion engine and a factor such as an increase in the clearance of each sliding part or the deterioration of oil corresponding to the integrated operation amount of the internal combustion engine, the oil consumption in the internal combustion engine is accurately calculated without requiring the expensive oil level sensor. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an oil consumption calculation device that calculates an oil consumption of a lubrication system of an internal combustion engine including a lubrication unit and an oil storage unit.

The oil pan of the internal combustion engine and the oil sub tank are communicated with each other through the oil supply path, and the solenoid valve provided in the oil supply path is controlled to open and close based on the result of detecting the oil level of the oil pan at regular intervals by the oil level sensor. By doing this, it is known from Patent Document 1 below that oil is automatically supplied from an oil sub-tank to an oil pan to prevent a decrease in oil level.
JP-A-3-246310

  By the way, in the case of checking the oil level of the oil pan of the internal combustion engine with an oil level gauge, since it is a judgment by the user's visual observation, if the user neglects or forgets the inspection, the oil level falls below the lower limit value and There is a possibility of damaging the lubrication part.

  In addition, if the oil level sensor automatically detects the oil level of the oil pan, the oil level sensor is not only expensive, but also the detection accuracy is reduced when detecting on an inclined ground or when traveling. There's a problem.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to accurately calculate the oil consumption of a lubricating system of an internal combustion engine without requiring an expensive oil level sensor.

  In order to achieve the above object, according to the first aspect of the present invention, in an oil consumption calculation device for calculating the oil consumption of a lubrication system of an internal combustion engine having a lubrication part and an oil storage part, the internal combustion engine Oil consumption calculating means for calculating oil consumption from the operating state of the engine, integrated operating amount calculating means for calculating the integrated operating quantity of the internal combustion engine, and oil consumption for calculating an oil consumption correction coefficient according to the integrated operating quantity An amount correction coefficient calculating means, and a correction means for correcting the oil consumption calculated by the oil consumption calculation means with the oil consumption correction coefficient calculated by the oil consumption correction coefficient calculation means An oil consumption calculation device is proposed.

  According to the invention described in claim 2, in addition to the configuration of claim 1, the integrated operation amount calculation means is configured such that when the structural member of the lubrication part is replaced or when the oil is replaced. An oil consumption calculating device is proposed, wherein the integrated operating amount is reset.

  According to the invention described in claim 3, in addition to the structure of claim 1, the oil consumption correction coefficient calculating means is configured such that when the constituent member of the lubrication part is replaced or when the oil is replaced. An oil consumption calculation device is proposed in which the oil consumption correction coefficient is sometimes corrected.

  According to a fourth aspect of the present invention, in addition to the configuration of any one of the first to third aspects, the oil consumption calculating means is configured to generate oil per unit time from the rotational speed and load of the internal combustion engine. There is proposed an oil consumption calculation device comprising unit time oil consumption calculation means for calculating consumption, and integration means for integrating the unit time oil consumption.

  According to the configuration of the first aspect, the oil consumption amount calculating means calculates the oil consumption amount from the operating state of the internal combustion engine, the integrated operation amount calculating means calculates the integrated operation amount of the internal combustion engine, and calculates the oil consumption amount correction coefficient. The means calculates the oil consumption correction coefficient according to the accumulated operating amount, and the correction means corrects the oil consumption with the oil consumption correction coefficient. The oil consumption of the internal combustion engine in consideration of such factors according to the operating state of the internal combustion engine and factors according to the cumulative operating amount of the internal combustion engine such as an increase in the clearance of each sliding part and oil deterioration Can be calculated with high accuracy.

  According to the configuration of the second aspect, since the integrated operation amount calculation means resets the integrated operation amount when the structural member of the lubrication unit is replaced or when the oil is replaced, the factor affecting the oil consumption amount The calculation accuracy can be further increased in consideration of

  According to the configuration of the third aspect, the oil consumption correction coefficient calculating means corrects the oil consumption correction coefficient when the constituent member of the lubrication part is replaced or when the oil is replaced. The calculation accuracy can be further increased in consideration of the state of the affecting factor.

  According to the configuration of claim 4, the oil consumption calculating means calculates the unit time oil consumption from the rotation speed and load of the internal combustion engine by the unit time oil consumption calculating means, and the unit time oil consumption by the integrating means. Since the oil consumption is calculated by integration, the oil consumption can be calculated with higher accuracy.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.

  1 to 4 show an embodiment of the present invention. FIG. 1 is a block diagram of an oil consumption calculation device, FIG. 2 is a flowchart for explaining the operation of oil consumption calculation, and FIG. FIG. 4 is a table for retrieving an oil consumption amount correction coefficient from the integrated operation amount.

  Oil that prevents wear and seizure of lubricating parts such as pistons, cylinders, connecting rods, crankshafts, and valve gears of internal combustion engines is discharged with blow-by gas or leaks into the combustion chamber as the internal combustion engine is operated. In other words, the fuel is burned with the air-fuel mixture and consumed. Normally, the amount of oil is checked by inserting an oil level gauge into the oil pan. However, forgetting to check the oil level may result in a poor lubrication due to a decrease in the oil level.

  FIG. 1 shows an oil consumption calculation device that automatically calculates the oil consumption of a four-stroke internal combustion engine for automobiles. The oil consumption amount calculation device includes an oil consumption amount calculation means M1, an integrated operation amount calculation means M2, an oil consumption amount correction coefficient calculation means M3, and a correction means M4. Further, the oil consumption amount calculation means M1 is oil per unit time. Consume from consumption calculating means M1a and integrating means M1b. The engine speed NE detected by the engine speed sensor Sa and the intake negative pressure PB detected by the intake negative pressure sensor Sb are input to the unit time oil consumption calculation means M1a of the oil consumption calculation means M1 and integrated. The vehicle speed V detected by the vehicle speed sensor Sc is input to the operation amount calculation means M2.

  Next, the operation of this embodiment will be described with reference to the block diagram of FIG. 1 and the flowchart of FIG.

  First, in step S1, the engine speed NE is detected by the engine speed sensor Sa, the intake negative pressure PB is detected by the intake negative pressure sensor Sb, and the vehicle speed V is detected by the vehicle speed sensor Sc. The integrated operation amount calculation means M2 calculates the integrated operation amount Dis (integrated operation distance in this embodiment) by integrating the vehicle speed V detected by the vehicle speed sensor Sc.

  In subsequent step S2, the unit time oil consumption calculating means M1a of the oil consumption calculating means M1 calculates the engine speed NE detected by the engine speed sensor Sa and the intake negative pressure PB detected by the intake negative pressure sensor Sb. By applying the map shown in FIG. 3, the unit time oil consumption amount oci (g / sec) of the oil stored in the oil storage part (oil pan or oil tank) of the internal combustion engine is calculated. Since the unit time oil consumption amount oci (g / sec) has a close correlation with the engine speed and load of the internal combustion engine, the unit time oil consumption amount is obtained from a map using the engine speed NE and the intake negative pressure PB as parameters. oci (g / sec) can be calculated with high accuracy.

  In the subsequent step S3, the unit time oil consumption calculating means M1a of the oil consumption calculating means M1 converts the unit time oil consumption oci (g / sec) by the oil specific gravity γ (g / L), thereby converting The unit time oil consumption OCi (L / sec) is calculated. If the unit time oil consumption amount oci (g / sec) on the vertical axis of the map of FIG. 3 is converted into the unit time oil consumption amount OCi (L / sec) in advance, the above conversion in step S3 becomes unnecessary. .

  In subsequent step S4, the integrating means M1b of the oil consumption calculating means M1 calculates the oil consumption OC by integrating the unit time oil consumption OCi (L / sec).

  In subsequent step S5, the oil consumption correction coefficient calculating means M3 applies the integrated operation amount Dis calculated in step S1 to the table of FIG. 4 to calculate the oil consumption correction coefficient K. The deterioration of oil (decrease in viscosity and increase in sludge) progresses with the increase in the accumulated operating amount Dis, and the clearance of each sliding portion of the internal combustion engine increases with the increase in the accumulated operating amount Dis. The unit time oil consumption OCi (L / sec) also increases due to the progress of the hardening of the oil, and the oil consumption OC obtained by integrating the unit time oil consumption OCi (L / sec) also increases. Therefore, the oil consumption correction coefficient K can be said to be a coefficient for correcting the influence of the increase in the oil consumption accompanying the increase in the integrated operation amount Dis.

  In subsequent step S6, the correction means M4 calculates the oil consumption OCf reflecting the oil consumption correction coefficient K by multiplying the oil consumption OC by the oil consumption correction coefficient K.

  Thus, according to the present embodiment, factors according to the operating state of the internal combustion engine such as the rotational speed and load, and the accumulated operating amount of the internal combustion engine such as an increase in clearance of each sliding portion and deterioration of oil. By considering the factors according to the above, the oil consumption amount of the internal combustion engine can be accurately calculated without the need for a conventional expensive oil level sensor. Moreover, the unit time oil consumption calculating means M1a calculates the unit time oil consumption OCi from the rotation speed and load of the internal combustion engine, and the integrating means M1b integrates the unit time oil consumption OCi to calculate the oil consumption OC. The oil consumption OC can be calculated with higher accuracy.

  Note that when the constituent members (for example, pistons and cylinders) of the lubrication part of the internal combustion engine are replaced, or when the oil is replaced, the integrated operation amount calculating means M2 resets the integrated operation amount Dis and the oil consumption amount. Since the correction coefficient calculation means M3 corrects the oil consumption correction coefficient K, the calculation accuracy of the oil consumption can be further improved in consideration of the state of factors that influence the oil consumption.

  Although the embodiments of the present invention have been described above, various design changes can be made without departing from the scope of the present invention.

  For example, the integrated operation amount in the present invention is not limited to the integrated operation distance of the vehicle in the embodiment, and may be an integrated rotation speed or an integrated operation time of the internal combustion engine.

  The operation in the present invention is not limited to the driving of an automobile or the operation of an internal combustion engine in the embodiment, but includes concepts such as navigation of a ship, flight of an aircraft, and operation and use of various devices.

  In the embodiment, the correction means M4 calculates the oil consumption amount OCf by multiplying the oil consumption amount OC by the oil consumption amount correction coefficient K. However, the oil consumption amount is calculated as the unit time oil consumption amount OCi (L / sec). The oil consumption amount OCf may be calculated by integrating the products multiplied by the correction coefficient K.

Block diagram of oil consumption calculation device Flow chart explaining the operation of oil consumption calculation A map that searches for oil consumption per unit time from engine speed and intake negative pressure Table to search for oil consumption correction coefficient from accumulated operating amount

Explanation of symbols

Dis Cumulative operating amount K of the internal combustion engine Oil consumption correction coefficient M1 Oil consumption calculation means M1a Unit time oil consumption calculation means M1b Integration means M2 Integrated operation amount calculation means M3 Oil consumption correction coefficient calculation means M4 Correction means OC Oil consumption Amount OCi Unit time oil consumption

Claims (4)

In an oil consumption calculation device for calculating an oil consumption of a lubrication system of an internal combustion engine having a lubrication part and an oil storage part,
Oil consumption calculating means (M1) for calculating oil consumption (OC) from the operating state of the internal combustion engine;
An integrated operating amount calculating means (M2) for calculating an integrated operating amount (Dis) of the internal combustion engine (E);
Oil consumption correction coefficient calculating means (M3) for calculating an oil consumption correction coefficient (K) according to the integrated operating amount (Dis);
Correction means (M4) for correcting the oil consumption (OC) calculated by the oil consumption calculation means (M1) with the oil consumption correction coefficient (K) calculated by the oil consumption correction coefficient calculation means (M3); ,
An oil consumption calculation device comprising:   The integrated operating amount calculating means (M2) resets the integrated operating amount (Dis) when a component of the lubrication part is replaced or when oil is replaced. The oil consumption calculation device described in 1.   The oil consumption correction coefficient calculating means (M3) corrects the oil consumption correction coefficient (K) when a component of the lubrication part is replaced or when oil is replaced. The oil consumption calculation device according to claim 1. The oil consumption amount calculation means (M1) includes a unit time oil consumption amount calculation means (M1a) for calculating a unit time oil consumption amount (OCi) from the rotational speed and load of the internal combustion engine, and the unit time oil consumption amount (OCi). The oil consumption calculation device according to any one of claims 1 to 3, further comprising an integration unit (M1b) for integrating the calculation unit.

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