JP2010145107A - Optical system for diagnosis of oil, and device for controlling internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately detect the degree of deterioration of oil and the rate of dilution of fuel in oil by a relatively simple constitution, in an optical system 20 for diagnosis of oil in an internal combustion engine 1. <P>SOLUTION: A data collecting part 21 has a first light transmitting and receiving part 24 making engine oil transmit first wavelength light λ1 determined within a range of 660-680 nm and receiving the transmitted light from the engine oil, a second light transmitting and receiving part 25 making the engine oil transmit second wavelength light λ2 determined within a range of 880-900 nm and receiving the transmitted light from the engine oil, and a third light transmitting and receiving part 26 making the engine oil transmit third wavelength light λ3 determined within a range of 2,370-2,430 nm or 2,500-2,540 nm and receiving the transmitted light from the engine oil. A data processing part 22 detects the degree of deterioration of the engine oil on the basis of the respective outputs of the first and second light transmitting and receiving parts 24 and 25, and also the rate of dilution of fuel in the engine oil on the basis of the output of the third light transmitting and receiving part 26. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical oil diagnostic apparatus for detecting oil properties of an internal combustion engine, for example, an oil deterioration degree and a fuel dilution rate. The present invention also relates to a control device for an internal combustion engine including a fuel injection valve.

  Conventionally, a method using light has been known in order to diagnose deterioration of oil in an internal combustion engine mounted on a vehicle such as an automobile (see, for example, Patent Document 1).

  In this conventional example, the deterioration of engine oil is diagnosed based on the light transmission loss and the light transmission loss difference of two kinds of specific wavelength light composed of near-infrared light.

  This is because the light guide for irradiating light emitted from the light source to the mirror provided at the tip of the oil level gauge and the light guide for receiving light that guides the light reflected by the mirror to the light receiving unit are formed with one optical fiber. This single optical fiber and the above-described mirror are incorporated in an oil level gauge. That is, the light emitted from the irradiation light guide is transmitted through the oil and then reflected by the mirror. The reflected light is guided to the light receiving light guide and reaches the light receiving portion.

  By the way, during the operation of the internal combustion engine, a phenomenon may occur in which the fuel supplied to the combustion chamber leaks from the gap between the piston and the cylinder and mixes with the oil in the crank chamber.

  Conventionally, in order to suppress the dilution of fuel into oil, when performing fuel injection during an intake stroke in a cylinder injection type internal combustion engine, based on a parameter representing the ease of attachment of fuel to the internal combustion engine, It is known to change the start timing of fuel injection (see, for example, Patent Document 2).

  In order to detect the dilution ratio of the fuel into the oil, techniques such as those disclosed in Patent Documents 3 and 4 are known.

  In the conventional example according to Patent Document 3, it is disclosed that the amount of oil diluted fuel is estimated according to an oil diluted fuel index set for each predetermined temperature range of the internal combustion engine.

In the conventional example according to Patent Document 4, it is disclosed that the dilution ratio of the fuel into the oil is determined using two kinds of different specific wavelength lights. In this conventional example, the difference in transmitted light intensity between two types of specific wavelength light increases with an increase in the fuel dilution rate, and the actual dilution value is compared with the master data to determine the fuel dilution rate. is doing.
JP 2001-27635 A JP 2002-13428 A JP 2004-197591 A JP 2005-156297 A

  In the conventional example according to Patent Document 3, since the oil diluted fuel amount is estimated using the operation state of the internal combustion engine as a parameter, there is a concern that the accuracy is low. In addition, in the case of the conventional example according to Patent Document 4, in order to determine the fuel dilution rate when the engine oil has deteriorated, it is necessary to prepare a large number of master data corresponding to the degree of oil deterioration. There is a concern that the equipment cost of the apparatus increases.

  In view of such circumstances, the present invention provides an optical oil diagnostic apparatus capable of detecting the oil deterioration degree and the fuel dilution rate of an internal combustion engine, and the oil deterioration degree and the fuel dilution in the oil with a relatively simple configuration. The purpose is to make it possible to accurately detect the rate.

  Another object of the present invention is to make it possible to reduce the fuel dilution rate in oil of an internal combustion engine in a control device for an internal combustion engine provided with a fuel injection valve.

  The present invention is an optical oil diagnostic device for detecting the properties of oil used in an internal combustion engine, based on an information collection unit for capturing information necessary for oil diagnosis, and information acquired from the information collection unit An information processing unit for detecting a degree of deterioration of the oil and a fuel dilution rate in the oil, and the information collection unit transmits the first wavelength light determined in a range of 660 nm to 680 nm to the oil, A first transmitter / receiver unit that receives the transmitted light, a second transmitter / receiver unit that transmits the second wavelength light determined in a range of 880 nm to 900 nm to the oil, and receives the transmitted light, and 2370 nm to the oil. A third transmission / reception unit that transmits the third wavelength light determined in the range of ˜2430 nm or 2500 nm to 2540 nm and receives the transmitted light; The information processing unit detects the degree of deterioration of the oil based on the outputs of the first and second light transmitting / receiving units, and dilutes the fuel in the oil based on the output of the third light transmitting / receiving unit. It is characterized by detecting the rate.

  In this configuration, the oil degradation degree is detected based on information collected by transmitting two types of wavelength light into the oil of the internal combustion engine, and one type of wavelength light is transmitted through the oil of the internal combustion engine. It becomes possible to detect the fuel dilution rate in the oil based on the collected information and constant data created in advance. This makes it possible to accurately detect the degree of deterioration of the oil and the fuel dilution rate in the oil, although the configuration is simpler than that of the conventional example.

  Preferably, the information processing unit includes transmittance calculating means for calculating the respective transmittances of the first, second, and third wavelength lights, and the first and second wavelength lights calculated by the transmittance calculating means. Deterioration degree detecting means for detecting the degree of oil deterioration based on each transmittance, and a difference between the fuel dilution rate in oil and the transmittance for the third wavelength light (from the transmittance of the third wavelength light for gasoline 100% to the oil 100% A first storage means for holding first constant data obtained by preliminarily correlating the correlation with a value obtained by subtracting the transmittance of the third wavelength light), the degree of deterioration of oil without fuel dilution, and the transmission of the third wavelength light. Second storage means for storing second constant data obtained by converting the correlation with the rate into data in advance, the transmittance of the third wavelength light calculated by the transmittance calculation means, and the calculated second constant data. Corresponds to the transmittance of three wavelengths of light Difference calculation means for calculating a difference from a numerical value, and fuel dilution by dividing the difference value calculated by the difference calculation means by a constant value corresponding to the calculated transmittance of the third wavelength light in the first constant data Fuel dilution rate calculation means for calculating the rate.

  In this configuration, the procedure and processing contents when examining the degree of deterioration of the oil and the fuel dilution rate are specified. According to this specification, it can be seen that the procedure and processing contents are comparatively easy. As a result, the control program can be simplified, and the memory capacity of the control system need not be increased.

  Preferably, the information processing unit operates the notification unit when at least one of the detected oil deterioration degree and the fuel dilution rate exceeds a limit value.

  According to this configuration, when the oil in the internal combustion engine has deteriorated more than a specified level, that is, when the oil replacement timing or the oil replacement timing is approaching, it is possible to notify the driver to that effect. For this reason, it is advantageous in avoiding the occurrence of wear and damage of components that require lubrication and cooling with oil in an internal combustion engine.

  The present invention is also a control device for controlling a fuel injection amount of a fuel injection valve provided in an internal combustion engine, wherein a detection result by the optical oil diagnostic device having the above configuration is a parameter used when correcting the fuel injection amount. It is one of the features.

  According to this configuration, it is possible to suppress or reduce the progress of fuel dilution into the oil of the internal combustion engine, and it is possible to reduce the fuel dilution rate. This is advantageous in extending the life of the oil in the internal combustion engine.

  The optical oil diagnostic apparatus according to the present invention can accurately detect the degree of oil deterioration and the fuel dilution rate in oil with a simpler configuration than the conventional example.

  In addition, the control device for an internal combustion engine according to the present invention can reduce the fuel dilution rate in the oil of the internal combustion engine, which is advantageous in extending the life of the engine oil.

  BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  1 to 9 show an embodiment of the present invention. Prior to the description of the optical oil diagnostic apparatus according to the present invention, a schematic configuration of an internal combustion engine to which the present invention is applied will be described with reference to FIG.

  As shown in FIG. 1, an intake passage 4 is connected to the combustion chamber 2 of the internal combustion engine 1 via an intake valve 3 and an exhaust passage 6 is connected via an exhaust valve 5.

  The intake passage 4 is provided with an electronically controlled throttle valve 7. This electronically controlled throttle valve 7 is basically opened and closed by a throttle motor driven in response to an operation of an accelerator pedal (not shown), and is introduced into the intake passage 4 according to the opening degree. The amount of intake air is adjusted.

  A fuel injection valve 8 for directly supplying fuel to the combustion chamber 2 is attached in the vicinity of the intake port of the combustion chamber 2. Although not shown, the fuel injection valve 8 is supplied with fuel at a predetermined pressure from a delivery pipe. Although not shown, the delivery pipe is supplied with fuel sucked up by a fuel pump from a fuel tank.

  A spark plug 9 is disposed in the combustion chamber 2 of the internal combustion engine 1. The spark plug 9 burns and explodes the air-fuel mixture (fuel + air) introduced into the combustion chamber 2, and the ignition timing is adjusted by the igniter 10. The igniter 10 is controlled by the control device 15.

  The operation of the internal combustion engine 1 will be briefly described. In the intake stroke of the internal combustion engine 1, air introduced into the intake passage 4 is taken into the combustion chamber 2 through the intake port and fuel injected from the fuel injection valve 8. Is supplied to the combustion chamber 2, the air-fuel mixture mixed in the combustion chamber 2 is compressed in the compression stroke, and then ignited by the spark plug 9 to burn and explode.

  As a result, the piston 11 is reciprocated and the crankshaft 13 is rotationally driven via the connecting rod 12. The exhaust gas in the combustion chamber 2 is released into the atmosphere from the exhaust port through the exhaust passage by opening the exhaust valve 5 in the exhaust stroke.

  Such operation of the internal combustion engine 1 is controlled by the control device 15. The control device 15 performs overall control of the internal combustion engine 1 (for example, air-fuel ratio control, fuel injection control, ignition control, etc.), and includes a CPU (Central Processing Unit), ROM (Program Memory), RAM A generally known ECU (Electronic Control Unit) including a (data memory), a backup RAM (nonvolatile memory), and the like.

  The ROM stores various control programs, maps that are referred to when the various control programs are executed, and the like. The CPU executes arithmetic processing based on various control programs and maps stored in the ROM. The RAM is a memory that temporarily stores the calculation results of the CPU, data input from each sensor, and the like. The backup RAM is a nonvolatile memory that stores data to be saved when the internal combustion engine 1 is stopped. Memory.

  Some of the various operation controls performed by the control device 15 will be briefly described.

  In the air-fuel ratio control, for example, the oxygen concentration in the exhaust gas is controlled based on outputs of an air-fuel ratio sensor (not shown) and an oxygen sensor (not shown) installed in the exhaust passage 6 connected to the exhaust port of the internal combustion engine 1. The amount of fuel injected by the fuel injection valve 8 is controlled so that the actual air-fuel ratio obtained from the calculated oxygen concentration matches the target air-fuel ratio (for example, the theoretical air-fuel ratio).

  As the fuel injection control, the target air-fuel ratio is calculated based on the internal combustion engine load, the engine speed, and the like, and the fuel injection amount is controlled so that the target air-fuel ratio is obtained based on the intake air amount detected by the air flow meter 16. (Control of the valve opening time of the fuel injection valve 8) is performed.

  As the ignition control, the ignition timing of the spark plug 9 is controlled based on the output from the crank position sensor 17.

  In the first place, as is well known, during the operation of the internal combustion engine 1, a part of the fuel adheres to the inner wall surface of the cylinder, leaks from the gap between the piston and the cylinder, and the oil is diluted. When the fuel diluted in the oil evaporates as the oil temperature rises and is sucked into the intake system from a blow-by system or the like (not shown), the air-fuel ratio becomes fuel rich. As the temperature of the internal combustion engine 1 rises (combustion chamber temperature rise), the phenomenon that the oil is diluted with the fuel is less likely to occur, and the fuel diluted in the oil tends to evaporate as the oil temperature rises. In addition, the fuel dilution rate changes as the operation progresses.

  The internal combustion engine 1 is equipped with an optical oil diagnostic device 20 for detecting the properties of oil used in the internal combustion engine 1.

  As shown in FIG. 2, the optical oil diagnostic apparatus 20 includes an information collection unit 21, an information processing unit 22, and a notification unit 23.

  The information collecting unit 21 takes in information necessary for detecting the property of the oil of the internal combustion engine 1 and includes first to third light transmitting / receiving units 24 to 26.

  The first light transmitting / receiving unit 24 is configured by combining the first light emitting element 31 and the first light receiving element 41. The second light transmitting / receiving unit 25 has a configuration in which the second light emitting element 32 and the second light receiving element 42 are combined. Further, the third light transmitting / receiving unit 26 is configured by combining the third light emitting element 33 and the third light receiving element 43. The first to third light emitting elements 31 to 33 are, for example, light emitting diodes (LEDs) or semiconductor lasers (LD), and the first to third light receiving elements 41 to 43 are, for example, photodiodes (PD) or the like. Is done.

  The first to third light emitting elements 31 to 33 emit light having different wavelengths. The first to third light receiving elements 41 to 43 output an electrical signal corresponding to the intensity of received light to the information processing unit 22.

  And the information collection part 21 is attached to the lower part of the oil pan 14 of the internal combustion engine 1 in the state immersed in the oil in the oil pan 14, for example, as shown in FIG. Although not shown in detail, an opposing space is provided between the first to third light emitting elements 31 to 33 and the first to third light receiving elements 41 to 43 so that oil in the oil pan 14 can enter. Therefore, in a state where the information collecting unit 21 is attached in the oil pan 14, the first to third wavelength lights λ1 to λ3 generated from the first to third light emitting elements 31 to 33 are in the oil pan 14. The transmitted light is received by the first to third light receiving elements 41 to 43.

  The information processing unit 22 detects the degree of oil deterioration of the internal combustion engine 1 based on the information captured by the first and second light transmitting / receiving units 24 and 25 of the information collecting unit 21 and captures it by the third light transmitting / receiving unit 26. Based on this information, the fuel dilution rate in the oil of the internal combustion engine 1 is detected.

  In this embodiment, the processing performed by the information processing unit 22 is configured to be performed by the control device 15 of the internal combustion engine 1. That is, in this embodiment, means for realizing the function as the information processing unit 22 is incorporated in the control device 15 of the internal combustion engine 1.

  The processing performed by the information processing unit 22 requires constant data serving as a comparison reference. Examples of the constant data include first constant data ΔαIλ3 and second constant data Iλ3map. This constant data is stored in advance in the ROM of the control device 15. Therefore, the control device 15 having this ROM corresponds to the first and second storage means described in the claims.

  As shown in FIG. 7, the first constant data ΔαIλ3 is the difference between the fuel dilution rate in the oil and the transmittance of the third wavelength light λ3 (from the transmittance of the third wavelength light λ3 with respect to gasoline 100%, the third relative to the oil 100%. Correlation with the value obtained by dividing the transmittance of the wavelength light λ3) is previously obtained by experimentation and converted into data.

  As shown in FIG. 9, the second constant data Iλ3map is data obtained by examining the correlation between the degree of deterioration of oil without fuel dilution and the transmittance of the third wavelength light λ3 in advance through experiments or the like.

  The notification unit 23 performs a notification operation for prompting the driver to change the oil. For example, at least one of the oil deterioration degree and the fuel dilution rate detected by the information processing unit 22 exceeds a predetermined limit value. Operated in case.

  The notification unit 23 is, for example, a lamp such as an LED, a display that displays characters or symbols, or a device that emits an alarm sound. For example, a location with good visibility such as the vicinity of a driver's seat in a vehicle cabin, an engine room, or the like. It is installed at an appropriate place.

  By the way, the 1st light emitting element 23 shall emit 1st wavelength light (lambda) 1 (visible light) defined in the range of 660 nm-680 nm. The second light emitting element 24 emits second wavelength light λ2 (near infrared light) determined in the range of 880 nm to 900 nm. The third light emitting element 25 emits the third wavelength light λ3 (near infrared light) determined in the range of 2370 nm to 2430 nm or 2500 nm to 2540 nm.

  The reason for selecting such wavelength light will be described with reference to FIGS.

  First, FIG. 4 shows the correlation between the deterioration degree (insoluble content concentration) of the oil of the internal combustion engine and the transmittance per unit length at the wavelength of light. In the figure, the transmittance spectrum is indicated by a solid line for 100% of the new oil, and a dashed line and a dotted line for the case where the insoluble content in the new oil is 2 wt%, respectively.

  As shown in FIG. 4, it can be seen that the transmittance decreases as the concentration of the insoluble component in the oil increases, that is, as the oil deteriorates. Moreover, it can be seen that the degree of decrease in transmittance is larger in the wavelength range of 660 nm to 680 nm that becomes visible light than in the wavelength range of 880 nm to 900 nm that becomes near infrared light. In the first place, it is considered that the cause of the decrease in the transmittance of near-infrared light to the oil is Mie scattering, and the cause of the decrease in the transmittance of visible light to the oil is the coloring property in addition to Mie scattering. It is considered that light is absorbed by the component (insoluble matter).

  From these facts, it is possible to detect the coloring component (insoluble matter) in the oil based on the difference in transmittance between the two types of wavelength light. Therefore, the two types of wavelength light were considered suitable for use in collecting information when detecting the degree of oil degradation.

  5 and 6 show the correlation between the fuel dilution rate of the oil of the internal combustion engine 1 and the transmittance in each wavelength region. The transmittance spectrum in FIG. 5 shows fuel (gasoline) 100% as a solid line and new oil 100% as a dotted line. Further, the transmittance spectrum in FIG. 6 is shown by a dotted line when the fuel (gasoline) dilution ratio in the new oil is 10%, and by a solid line when it is 20%.

  As shown in FIG. 5, in the transmittance spectrum relating to 100% fuel (gasoline) and the transmittance spectrum relating to 100% new oil, the transmission in the new oil 100% in the range of 2370 nm to 2400 nm and the range of 2500 nm to 2540 nm. The difference between the rate and the transmittance at 100% fuel increases. Moreover, in the range of 2370 nm to 2400 nm and the range of 2500 nm to 2540 nm, the transmittance decreases as the concentration of insoluble matter in the oil increases, that is, as the oil deteriorates, as shown in FIG. ing. From these facts, it was considered that the light in the above-mentioned range is suitable for use in collecting information when detecting the fuel dilution rate.

  Incidentally, by arranging FIG. 5 and FIG. 6, a correlation diagram as shown in FIG. 7 is obtained. In FIG. 7, the solid line indicates the case where the third wavelength light λ3 is 2400 nm, and the dotted line indicates the case where the third wavelength light λ3 is 2500 nm. As shown in FIG. 7, the fuel dilution rate increases in proportion to the increase in the transmittance difference, and there is a predetermined slope for each wavelength.

  Next, the diagnostic procedure of the optical oil diagnostic apparatus 20 will be described with reference to the flowchart shown in FIG.

  First, in step S1, information necessary for detecting the properties of oil is collected. Here, the first to third light transmitting / receiving units 24 to 26 of the information collecting unit 21 are used. Specifically, when the first to third light receiving elements 41 to 43 receive the first to third wavelength light beams λ1, λ2, and λ3 emitted from the first to third light emitting elements 31 to 33 and transmitted through the oil. The first to third light receiving elements 41 to 43 output electrical signals corresponding to the intensity of light received. The information processing unit 22 calculates transmission absorbance (light transmission loss) per unit length by which light is transmitted and absorbed based on the output signals from the first to third light receiving elements 41 to 43, respectively. The transmittances Iλ1, Iλ2, and Iλ3 of the first to third wavelength lights λ1, λ2, and λ3 with respect to the oil are obtained. This step S1 corresponds to the transmittance calculating means described in the claims.

  In step S2, the degree of oil deterioration is detected based on the information collected by the first and second light transmitting / receiving units 24 and 25, that is, the respective transmittances Iλ1 and Iλ2 of the first and second wavelength light λ1 and λ2. This step S2 corresponds to the deterioration degree detecting means described in the claims.

  Here, -Ln (Iλ1 / Iλ2) is calculated based on the first and second transmittances Iλ1 and Iλ2 measured in step S1, and the calculation result is collated with the comparison reference data shown in FIG. Thus, the concentration of insoluble matter in the oil, that is, the degree of oil deterioration is obtained. The comparison reference data shown in FIG. 8 is obtained by the following calculation formula.

C = α × [−Ln (Iλ1 / Iλ2)]
In the above calculation formula, C is a sludge precursor concentration (insoluble matter concentration in oil), and α is a constant. That is, since the change in the logarithm of the ratio between the transmittance Iλ1 of the first wavelength light λ1 and the transmittance Iλ2 of the second wavelength light λ2 has a correlation with a parameter that is a measure indicating the degree of deterioration of the oil, the first wavelength light λ1 The degree of deterioration of the oil can be diagnosed by calculating the logarithm of the ratio between the transmittance Iλ1 of the first light and the transmittance Iλ2 of the second wavelength light λ2.

  In step S3, a constant value corresponding to the transmittance Iλ3 calculated in step S1 is read from the first constant data ΔαIλ3 (see FIG. 8) stored in advance in the necessary area of the ROM, and second constant data Iλ3map (FIG. 9), a constant value corresponding to the transmittance Iλ3 calculated in step S1 is read.

  In step S4, the difference between the transmittance Iλ3 of the third wavelength light λ3 calculated in step S1 and the constant value corresponding to the transmittance Iλ3 calculated in step S1 in the second constant data Iλ3map read in step S3. ΔIλ3 is calculated.

  The steps S3 and S4 correspond to the difference calculation means described in the claims.

  In step S5, the fuel dilution rate in the oil is obtained. Here, the difference value ΔIλ3 calculated in step S4 is divided by the constant value corresponding to the transmittance Iλ3 calculated in step S1 in the first constant data ΔαIλ3 read in step S3. Thereby, the fuel dilution rate is calculated. This step S5 corresponds to the fuel dilution rate calculating means described in the claims.

  By the way, the oil deterioration degree and the fuel dilution rate calculated as described above can be stored and saved in a memory backed up by a battery mounted on the vehicle, such as a backup RAM.

  Further, the information processing unit 22 can be configured to perform an abnormality handling process as described below. This abnormality coping process includes a step of determining whether or not the calculated oil deterioration level and fuel dilution rate are respectively compared with a limit value stored in advance in a ROM or the like, If it is determined that the oil pressure is exceeded, at least the step of informing the driver that the oil change is necessary by operating the notification unit 23 is included.

  As described above, in the embodiment to which the present invention is applied, the degree of oil deterioration is detected based on the information collected by transmitting two kinds of wavelength light into the oil of the internal combustion engine 1, and the internal combustion engine 1 The fuel dilution rate in the oil is detected based on information collected by transmitting one wavelength of light into the oil and constant data created in advance. This makes it possible to accurately detect the degree of deterioration of the oil and the fuel dilution rate in the oil, although the configuration is simpler than that of the conventional example.

  In particular, in the above embodiment, since the information collecting unit 21 of the optical oil diagnostic apparatus 20 is installed at the bottom of the oil pan 14 of the internal combustion engine 1, the influence of light diffusion loss due to bubbles that are likely to occur on the oil level. It is possible to collect information in a state where it is difficult to receive it, which is advantageous for accurate diagnosis.

  By the way, when the control device 15 of the internal combustion engine 1 corrects the fuel injection amount by the fuel injection valve 8, a water temperature sensor that detects the coolant temperature of the internal combustion engine 1 or an oil temperature sensor that detects the oil temperature of the internal combustion engine 1. However, as one of the information necessary for the correction, the oil deterioration degree and the fuel dilution rate detected by the optical oil diagnostic apparatus 20 shown in the above-described embodiment are used. Also good. In this case, the correction form of the fuel injection amount can be a generally known method, that is, a form of correcting the fuel injection pulse width. As a result, it is possible to suppress or reduce the progress of dilution of fuel into oil, and as a result, it is advantageous in extending the life of the oil of the internal combustion engine 1.

  In addition, this invention is not limited only to the said embodiment, All the deformation | transformation and application included in the range equivalent to the claim and the said range are possible. Examples are given below.

  (1) The internal combustion engine 1 shown in the above embodiment is not particularly limited, such as a gasoline engine or a diesel engine, and the present invention is also applied to an engine mounted on an automobile called a so-called flexible fuel vehicle (FFV). be able to.

  (2) In the above embodiment, an example in which the information processing unit 22 of the optical oil diagnostic apparatus 20 is incorporated in the control device 15 of the internal combustion engine 1 is described. However, the information processing unit 22 is a single control device, It is possible to connect to the control device 15 of the internal combustion engine 1.

It is a figure which shows schematic structure of an internal combustion engine provided with the optical oil diagnostic apparatus which concerns on this invention. It is a figure which shows the structure of the optical oil diagnostic apparatus of FIG. It is a flowchart which shows the diagnostic procedure by the optical oil diagnostic apparatus of FIG. It is a graph which shows the transmittance | permeability in each wavelength range about the case where the deterioration degree (insoluble content density | concentration) of new oil is 0%, 10%, and 20%. It is a graph which shows the transmittance | permeability in each wavelength range about 100% of new oil and 100% of fuel (gasoline). It is a graph which shows the transmittance | permeability in each wavelength range about the case where the fuel (gasoline) dilution rate in new oil is 10% and 20%. This is first constant data used for calculation of the fuel dilution rate, and shows the correlation between the fuel dilution rate in oil and the transmittance difference with the third wavelength light. It is comparison reference data for detecting the degree of oil deterioration, and is a graph in which the correlation between the oil deterioration calculated values by the first and second wavelength light and the concentration of insoluble matter in oil is converted into data beforehand. This is second constant data used for calculation of the fuel dilution rate, and shows the correlation between the degree of deterioration of oil without fuel dilution and the transmittance of the third wavelength light.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Combustion chamber 3 Intake passage 8 Fuel injection valve 15 Control apparatus 20 Optical oil diagnostic apparatus 21 Information collection part 22 Information processing part 23 Notification part 24 1st light transmission / reception part 25 2nd light transmission / reception part 26 3rd light transmission / reception Part

Claims (4)

An optical oil diagnostic apparatus for detecting the properties of oil used in an internal combustion engine,
An information collecting unit for capturing information necessary for oil diagnosis, and an information processing unit for detecting the degree of deterioration of the oil and the fuel dilution rate in the oil based on the information captured from the information collecting unit,
The information collection unit transmits the first wavelength light determined in the range of 660 nm to 680 nm to the oil, and receives the transmitted light.
A second transmitter / receiver that transmits the second wavelength light determined in a range of 880 nm to 900 nm to the oil and receives the transmitted light;
A third transmission / reception unit that transmits the third wavelength light determined in the range of 2370 nm to 2430 nm or 2500 nm to 2540 nm and receives the transmitted light in the oil;
The information processing unit detects the degree of deterioration of the oil based on the outputs of the first and second light transmitting / receiving units, and determines the fuel dilution rate in the oil based on the output of the third light transmitting / receiving unit. An optical oil diagnostic apparatus characterized by detecting. The optical oil diagnostic apparatus according to claim 1,
The information processing unit includes transmittance calculating means for calculating the transmittances of the first, second, and third wavelength lights, respectively.
A deterioration degree detecting means for detecting an oil deterioration degree based on the respective transmittances of the first and second wavelength lights calculated by the transmittance calculating means;
The correlation between the fuel dilution rate in the oil and the transmittance difference with respect to the third wavelength light (a value obtained by subtracting the transmittance of the third wavelength light with respect to 100% of oil from the transmittance of the third wavelength light with respect to 100% of gasoline) in advance. First storage means for holding first constant data formed as data;
Second storage means for holding second constant data obtained by previously converting the correlation between the degree of deterioration of oil without fuel dilution and the transmittance of the third wavelength light;
Difference calculating means for calculating a difference between the transmittance of the third wavelength light calculated by the transmittance calculating means and a constant value corresponding to the calculated transmittance of the third wavelength light in the second constant data;
Fuel dilution rate calculation means for calculating a fuel dilution rate by dividing the difference value calculated by the difference calculation means by a constant value corresponding to the calculated transmittance of the third wavelength light in the first constant data. An optical oil diagnostic apparatus characterized by that. The optical oil diagnostic apparatus according to claim 1 or 2,
It further includes a notification unit that performs a notification operation for prompting the driver to change oil,
The information processing unit operates the notification unit when at least one of the detected oil deterioration degree and the fuel dilution rate exceeds a limit value.   A control device for controlling a fuel injection amount of a fuel injection valve provided in an internal combustion engine, wherein a detection result by the optical oil diagnostic device according to any one of claims 1 to 3 corrects the fuel injection amount. A control device for an internal combustion engine, characterized in that the control device is one of the parameters used for the operation.

Images