JPH0627771Y2 - Diagnostic device for internal combustion engine lubricating oil system - Google Patents

Description

[Detailed Description of the Invention] <Industrial field of application> The present invention is to pump the lubricating oil stored in a tank by a pump to supply the lubricating oil to the bearing portion of an internal combustion engine, and to supply the lubricating oil after the filling to the above tank. The invention relates to a diagnostic device for an internal combustion engine lubricating oil system.

<Prior art> Conventionally, for example, in a lubricating oil system of a diesel engine, a pressure sensor that detects the pressure of the lubricating oil that is pumped, a differential pressure sensor that detects the pressure difference between the lubricating oil before and after the filter, and the temperature of the lubricating oil are used. A temperature sensor for detecting is provided. Then, the detection signals from these sensors are input to a measuring instrument or a recorder and displayed and recorded as measured values, and the driver judges the presence or absence of abnormality of the lubricating oil system from these measured values, Is monitoring the operating status of.

<Problems to be solved by the invention> However, the above conventional monitoring system of the lubricating oil system of the diesel engine is merely to display and record the detection signal of each sensor as it is as a measured value, and at best, Since an abnormal alarm is issued when the measured value deviates from the predetermined normal range, what kind of abnormality occurred in which part of the lubricating oil system, such as when multiple sensors showed abnormal values. In order to know exactly, it is necessary to rely on the judgment of a professional engineer who is familiar with diesel engines. That is, the expert engineer examines various possibilities based on the past experience, experimental data, know-how and theory based on the abnormality in the pressure and temperature of the lubricating oil indicated by the specific sensor as the measured value, and finds the most appropriate The cause is presumed, and measures are taken for this abnormal cause.

However, the recent strong demand for labor saving and the decrease in the number of specialists make it difficult to monitor and maintain the lubricating oil system and the engine based on the judgment of such specialists, and the cause of the abnormality is delayed and the engine is delayed. It caused the problem of stopping driving.

Therefore, the purpose of the present invention is to provide a new abnormality cause estimating means based on conventional experience, experimental data, theory, etc., so that the lubricating oil system can be operated based on the input signal from each sensor provided in the lubricating oil system. The present invention provides a diagnostic device for an internal combustion engine lubricating oil system, which can determine the presence or absence of abnormality and output accurate information regarding the abnormal portion, and thus contribute to labor saving and efficiency of engine operation and maintenance.

<Means for Solving the Problems> In order to achieve the above object, the diagnostic device of the present invention uses the lubricating oil stored in the tank provided with the oil level sensor and the second temperature sensor, at the first temperature on the outlet side. Bearings of an internal combustion engine by a pump through a cooler having a temperature control valve provided with a sensor, a filter provided with a differential pressure sensor, and a pressure control valve provided with a pressure sensor on the outlet side through an oil supply pipe sequentially provided from the tank side. In the internal combustion engine lubrication oil system that supplies the lubrication oil to the tank and collects the replenished lubrication oil in the tank, it is determined whether the pressure of the lubrication oil is within a predetermined allowable range based on the input signal from the pressure sensor. The pressure determining means for determining, the oil temperature determining means for determining whether the temperature of the lubricating oil is within a predetermined allowable range based on the input signals from the first and second temperature sensors, and the differential pressure Based on the input signal from the sensor, Differential pressure determining means for determining whether or not the pressure difference between the lubricating oil before and after the tank is less than a predetermined allowable value, and the lubricating oil level in the tank is within a predetermined allowable range based on the input signal from the oil level sensor. An oil level discriminating means for discriminating whether or not it is inside
If the lubricating oil pressure, the oil level, and the oil temperature measured by the first and second temperature sensors are all outside the allowable range, based on the results of the determination by the oil temperature, differential pressure, and oil level determination means, oil leakage, air suction, If water contamination is diagnosed and the differential pressure of the lubricating oil and the oil temperature measured by the first and second temperature sensors are all outside the allowable range, it is diagnosed that the temperature control valve or cooler is defective, or the filter is clogged. Differential pressure,
If the oil temperature measured by the second temperature sensor is out of the allowable range, it is diagnosed that the pressure regulating valve is defective or the filter is clogged. If the oil level of the lubricating oil, the differential pressure, and the oil temperature measured by the first temperature sensor are all outside the allowable range, If it is diagnosed that the cooling water is mixed and if the oil temperature of the lubricating oil by the first and second temperature sensors is out of the allowable range, it is diagnosed as a defect of the temperature sensor, the temperature control valve or the cooler, and the lubricating oil If both the oil temperature and the differential pressure are outside the allowable range, it is diagnosed as insufficient warm-up and filter clogging. If the differential pressure of the lubricating oil and the oil temperature from the second temperature sensor are outside the allowable range, the temperature control valve or cooler is defective. The computer is provided with an abnormality cause estimating means for diagnosing a filter clogging and diagnosing a pressure sensor failure and a filter clogging if both the pressure and the differential pressure of the lubricating oil are out of the allowable ranges.

<Operation> The pressure determining means included in each of the computers determines whether the pressure of the lubricating oil on the outlet side of the pressure regulating valve is appropriate based on the input signal from the pressure sensor, and the oil temperature determining means is the first and second temperature sensors. Based on the input signals from the temperature control valve and the temperature of the lubricating oil in the tank, respectively, the differential pressure determination means,
Based on the input signal from the differential pressure sensor, the appropriateness of the differential pressure before and after the filter is determined, and the oil level determination means determines the appropriateness of the oil level in the tank based on the input signal from the oil level sensor.

Next, the abnormality cause estimation means included in the computer
Based on the oil temperature results of the pressure, oil temperature, differential pressure, and oil level determination means, i) if the lubricating oil pressure, oil level, and oil temperature by the first and second temperature sensors are all outside the permissible range, Diagnosis of oil leakage, air suction, and water mixing, ii) differential pressure of lubricating oil, first and second
If all the oil temperature by the temperature sensor is out of the allowable range, it is diagnosed that the temperature control valve or the cooler is defective, or the filter is clogged, and iii) the lubricating oil pressure, differential pressure, and the oil temperature by the second temperature sensor are all within the allowable range. If it is outside, it is diagnosed as a pressure regulator valve failure and filter clogging,
iv) If the oil level of the lubricating oil, the differential pressure, and the oil temperature measured by the first temperature sensor are all outside the permissible range, it is diagnosed that cooling water, etc. is mixed, and v)
If the oil temperature of the lubricating oil by the first and second temperature sensors is out of the allowable range, it is diagnosed that the temperature sensor, temperature control valve or cooler is defective, and vi) the lubricating oil oil temperature and differential pressure are both If it is outside the allowable range, it is diagnosed as insufficient warm-up and filter clogging, and vii) If the differential pressure of the lubricating oil and the oil temperature by the second temperature sensor are both outside the allowable range, it may indicate that the temperature control valve or cooler is defective, or the filter is clogged. Diagnose and viii) If both the pressure and the differential pressure of the lubricating oil are outside the allowable range, diagnose the pressure sensor failure and filter clogging.

<Embodiment> The present invention will be described in detail below with reference to an illustrated embodiment.

FIG. 1 is a schematic diagram of a diesel engine equipped with a lubricating oil system diagnostic device according to the present invention, in which 1 is a tank for storing lubricating oil, and 2 is a tank.
Is a pump for pumping the lubricating oil in the tank 1, 3 is a cooler for cooling the lubricating oil being pumped with water, and 4 is a pump for automatically adjusting the ratio between the amount of oil bypassing the cooler 3 and the amount of oil flowing through it. A temperature control valve for keeping the temperature of the lubricating oil at a set temperature, 5 is a filter for filtering the lubricating oil passing through the temperature controlling valve 4, and 6 is the pressure of the lubricating oil passing through the filter 5 is adjusted to an appropriate feed pressure. A pressure regulating valve, 7 is a piston oil supply pipe for feeding lubricating oil from the pressure regulating valve 6 to each piston 8 of the diesel engine, and 9 is a bearing oil feeding pipe for feeding lubricating oil from the pressure regulating valve 6 to a bearing portion such as the crankshaft 10 of the diesel engine. , 11 are return pipes for collecting the lubricating oil after refueling accumulated in the oil pan 12 of the diesel engine into the tank 1.

Further, 15 is provided in the bearing oil supply pipe 9, a pressure sensor for detecting the supply pressure of the lubricating oil, 16 is provided in the filter 5, and a differential pressure sensor for detecting the pressure difference of the lubricating oil before and after the filter, 17 Reference numerals 18, 18 are provided on the outlet side of the temperature control valve 4 and the inlet side of the pump 2, respectively, and first and second temperature sensors for detecting the oil temperature, and 19 are oil level sensors for detecting the lubricating oil level of the tank 1. , 20 are provided with a pressure discriminating means, an oil temperature discriminating means, a differential pressure discriminating means, an oil level discriminating means, and an abnormality cause estimating means, which will be described later. A computer as a lubricating oil system diagnostic device for making a predetermined determination based on the reference numeral 21 is a display device for displaying the discrimination result output from the computer 20 and information on an abnormal portion of the lubricating oil system.

Each discriminating means of the computer 20 functions as shown in FIG. That is, the pressure determining means is the pressure sensor 15
Based on the input signal from (1), it is determined whether the lubricating oil feed pressure P is between a predetermined lower limit value and a predetermined upper limit value (step S
2, S10), the oil temperature determination means is the first and second temperature sensor 1
Based on the input signals from 7, 18, it is judged whether the temperature T _{1 of the} lubricating oil to be supplied and the temperature T ₂ of the lubricating oil in the tank 1 are within the respective allowable ranges (step S4, S5, S1
3, S14, S15 and S3, S11, S12), the oil level determination means determines whether the lubricating oil level L in the tank 1 is within a predetermined allowable range based on the input signal from the oil level sensor 19. It is determined whether the pressure difference ΔP of the lubricating oil before and after the filter 5 is less than or equal to a predetermined allowable value based on the input signal from the differential pressure sensor 16 (see step S18). Determine (Steps S6, S7, S8, S9, S16, S1
7). The determination procedure by these determination means is as shown in the flowchart of FIG. 2, and the determination of any of the final steps (S19) to (S36) of the flowchart is performed by the abnormality cause estimation means according to the combination of the determination results. Then, the computer 20 outputs the information on the abnormal portion of the lubricating oil system, which is the result of these determinations, to the display device 21 for display.

The operation of the computer 20 having the above configuration will be described below with reference to the flowchart of FIG.

(S1) Diesel engine starts, pump 2, cooler 3,
When the temperature control valve 4 and the pressure control valve 6 are actuated and the circulation of the lubricating oil in the lubricating oil system is started, the pressure sensor 15, the differential pressure sensor 16, the first and second temperature sensors 17 provided in this lubricating oil system. , 1
The detection signals from 8 and the oil level sensor 19 are input to the computer 20 as data.

(S2) The computer 20 determines whether or not the lubricating oil supply pressure P is between a predetermined lower limit value and a predetermined upper limit value based on the input data from the pressure sensor 15 by means of the pressure determining means. If so, the process proceeds to step (S3). If not, the process proceeds to step (S10).

(S3) The oil temperature determination means of the computer 20 is a temperature sensor.
Based on the input data from 17, 18, it is first judged whether the oil temperature T ₂ in the tank 1 is within a predetermined allowable range, and if it is judged as affirmative, it is judged in step (S4) that it is not. For example, in step (S5), it is further determined whether or not the oil temperature T ₁ of refueling is within a predetermined allowable range. Then, if it is determined to be affirmative in step (S4), the process proceeds to (S6), and if it is determined to be no (S7).
On the other hand, when the determination is affirmative in step (S5), the process proceeds to (S8), and when the determination is negative, the process proceeds to (S9).

(S6) to (S9) In these steps, the differential pressure determination means of the computer 20 determines whether the pressure difference ΔP before and after the filter 5 is less than or equal to a predetermined value based on the input data from the differential pressure sensor 16. To do. When it is determined that the pressure difference ΔP exceeds the predetermined value, steps (S36) and (S
33), (S31), and (S29), the abnormality cause estimating means outputs a signal indicating filter clogging. On the other hand, when it is determined that the pressure difference ΔP is less than or equal to the predetermined value, the abnormality cause estimating means is normal (S35) because everything is normal in step (S6), and if it is positive in step (S7), only the oil temperature T ₁ is obtained. Is abnormal, the temperature sensor 17 is defective or the temperature control valve 4, the cooler 3 is defective (S34), and if not, it is determined whether the oil level L is within a predetermined allowable range. Insufficient warm-up due to abnormal oil temperature T ₁ and pressure difference ΔP (S33)
If it is determined to be no, it is diagnosed that cooling water or the like is mixed because the oil level is abnormal. Further, if the answer in step (S8) is positive, only the oil temperature T ₂ is abnormal, so the temperature sensor 18 is defective (S3
2) and if the answer in step (S9) is positive, the oil temperatures T ₁ and T ₂ are abnormal, so the temperature sensors 17 and 18 are defective or the temperature control valve and cooler are defective (S3
The signals displayed as 0) are output respectively.

(S10) Since the lubricating oil feed pressure P is out of the proper range, the computer 20 proceeds to step (S11) if the feed pressure P is equal to or lower than the lower limit value, or proceeds to step (S12) if the feed pressure P is equal to or higher than the upper limit value.

(S11), (S12) In these steps, the oil temperature discriminating means of the computer 20 first discriminates whether or not the oil temperature T ₂ in the tank 1 is within a predetermined allowable range, as described above.
When it is determined no in step (S11) and when step (S11)
When it is determined to be affirmative or negative in 12), step (S13),
In (S14) and (S15), it is further determined whether or not the oil temperature T ₁ of refueling is within a predetermined allowable range, while when the result is affirmative in step (S11), the process proceeds to step (S16).
Then, if it is determined to be affirmative in step (S13), the process proceeds to step (S17), and if not, the process proceeds to step (S18).

(S14), (S15) When it is determined to be affirmative in step (S14), the abnormality cause estimating means of the computer 20 determines the feed pressure P.
Since only the pressure is too high, proceed to step (S21) and adjust pressure regulator 6
When it is displayed as defective or blocked at the end of the lubricating oil system and it is determined to be no,
Since the oil temperature T _{1 of} refueling is abnormal, the process proceeds to step (S22) and the temperature sensor 17 is displayed as defective. Further, the abnormality cause estimating means, when it is determined to be affirmative in step (S15),
Since the delivery pressure P is too high and the oil temperature T ₂ in the tank is abnormal, the process proceeds to step (S19) to display the pipe blockage and the temperature sensor 18 failure, and when it is determined to be no, the delivery pressure P is too high. Moreover, since the oil temperatures T ₁ and T ₂ are abnormal, the process proceeds to step (S20), and it is displayed that the pressure regulating valve 6 is defective, the temperature regulating valve 4 and the cooler 3 are defective.

(S16), (S17) In these steps, the differential pressure determination means of the computer 20 determines whether or not the pressure difference ΔP before and after the filter 5 is equal to or less than a predetermined value, as described above.
Then, when it is determined that the pressure difference ΔP exceeds the predetermined value, the abnormality cause estimating means of the computer 20 proceeds to steps (S28) and (S26), respectively, and displays that the filter is clogged. On the other hand, when it is determined that the pressure difference ΔP is less than or equal to the predetermined value, in step (S16), since only the feed pressure P is too low, the process proceeds to step (S27), and it is displayed that the pressure sensor 15 is defective, and step (S17). In (), since the supply pressure P is too low and the oil temperature T ₂ in the tank is abnormal, the process proceeds to step (S25) and the pressure regulating valve 6 is displayed as defective.

(S18) The oil level determination means of the computer 20 determines whether or not the lubricating oil level L in the tank 1 is within a predetermined allowable range based on the input data from the oil level sensor 19, and determines that the answer is positive. At this time, although there is no abnormality in the oil level, since the feed pressure P is too low and the oil temperatures T ₁ and T ₂ are abnormal, the abnormality cause estimating means displays the failure of the lubricating oil pump 2 in step (S23), When judged, the oil level, oil level drop, jacket cooling water, etc. are displayed as mixed in the step (S24) where the oil level is abnormally decreased or increased.

In the present invention, the components of the lubricating oil system are arranged in a specific positional relationship, that is, the cooler 3, the filter 5, and the pressure regulating valve 6 each having the temperature regulating valve 4 in order on the discharge side of the pump 2 are provided. The first and second temperature sensors 17, 18 on the outlet side and the inlet side of the
To the filter 5, the differential pressure sensor 16 and the pressure regulating valve 6
Pressure sensors 15 are respectively provided on the outlet sides of the above, and the abnormal portion of the lubricating oil system is discriminated easily and accurately by the computer 20 based on the input signals from these sensors, and the discrimination result is obtained. Since the specific display is provided on the display device, even a general driver who is not a specialized engineer can appropriately deal with the abnormality of the lubricating oil system that occurs during engine operation.

A pressure sensor may be provided in the piston oil supply pipe 7 of the above embodiment so that the computer 20 can perform the same diagnosis based on the input data from the pressure sensor.

<Effect of the Invention> As is apparent from the above description, the internal combustion engine lubricating oil system diagnostic device of the present invention is a lubricating oil system that circulates the lubricating oil of the tank to the bearing portion of the internal combustion engine through a filter through a filter. Based on the input signals from the pressure sensor, the temperature sensor, the filter differential pressure sensor and the oil level sensor in the tank, the pressure, oil temperature, differential pressure, and oil level discriminating means included in the computer supply the oil. It is determined whether the hydraulic pressure, the oil temperature, the differential pressure before and after the filter, and the oil level are within respective predetermined allowable ranges, and the abnormality cause estimation means included in the same computer is used as the abnormality cause estimation means included in the same computer based on these determination results. Since the information related to the above is specifically output, a general driver can quickly and accurately know the abnormality that occurs in the lubricating oil system during engine operation, regardless of the expert engineer.
This abnormality can be dealt with appropriately, and contributes greatly to labor saving and efficiency of engine operation and maintenance.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a diesel engine equipped with a lubricating oil system diagnostic device of the present invention, and FIG. 2 is a flow chart showing a processing flow of the diagnostic device. 1 ... Tank, 2 ... Pump, 3 ... Cooler, 4 ... Temperature regulating valve, 5 ... Filter, 6 ... Pressure regulating valve, 9 ... Bearing lubrication pipe, 10 ... Crank shaft, 11 ... Return pipe, 15 ... Pressure sensor, 16 ... Differential pressure sensor, 17, 18 ... Temperature sensor, 19 ... Oil level sensor, 20 ... Computer, 21 ... Display device.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A lubricating oil stored in a tank provided with an oil level sensor and a second temperature sensor, a cooler having a temperature control valve provided with a first temperature sensor on the outlet side, and a filter provided with a differential pressure sensor. An internal combustion engine that supplies a lubricating oil after refueling to the tank by supplying a pressure regulating valve having a pressure sensor on the outlet side from the tank side to a bearing portion of the internal combustion engine by a pump through an oil supply pipe that is sequentially provided from the tank side. A diagnostic device for a lubricating oil system, comprising pressure determining means for determining whether the pressure of the lubricating oil is within a predetermined allowable range based on an input signal from the pressure sensor, and the first and second temperatures. Oil temperature determination means for determining whether or not the temperature of the lubricating oil is within a predetermined allowable range based on the input signal from the sensor, and the lubricating oil before and after the filter based on the input signal from the differential pressure sensor. Is the pressure difference below a certain allowable value? A differential pressure determining means for determining whether the lubricating oil level in the tank is within a predetermined allowable range based on an input signal from the oil level sensor, If the lubricating oil pressure, the oil level, and the oil temperature measured by the first and second temperature sensors are all outside the allowable range, based on the results of the determination by the oil temperature, differential pressure, and oil level determination means, oil leakage, air suction, If water contamination is diagnosed and the differential pressure of the lubricating oil and the oil temperature measured by the first and second temperature sensors are all outside the allowable range, it is diagnosed that the temperature control valve or cooler is defective, or the filter is clogged.
If the differential pressure and the oil temperature measured by the second temperature sensor are all outside the allowable range, it is diagnosed that the pressure regulating valve is defective or the filter is clogged, and the oil level of the lubricating oil, the differential pressure, and the oil temperature measured by the first temperature sensor are all within the allowable range. If it is outside, it is diagnosed as mixing of cooling water etc.
If the oil temperature from the second temperature sensor is out of the allowable range, it is diagnosed as a defect in the temperature sensor, temperature control valve, or cooler. If both the oil temperature and the differential pressure of the lubricating oil are out of the allowable range, warm-up is insufficient. ， If the filter clogging is diagnosed and the differential pressure of the lubricating oil and the oil temperature by the second temperature sensor are both outside the allowable range, it is diagnosed as a temperature control valve or cooler failure, filter clogging, and the lubricating oil pressure, differential pressure If both are out of the allowable range, an internal combustion engine lubricating oil system diagnostic apparatus is provided with a computer having an abnormality cause estimating means for diagnosing a pressure sensor failure and filter clogging.