JPS6024285B2 - How to measure engine oil consumption - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for measuring the amount of engine oil consumed during operation of an automobile or the like.

For example, in reciprocating engines for automobiles, engine oil leaks from between the piston ring and the cylinder wall and enters the heat transfer chamber, or leaks from the valve seal and enters the combustion chamber.

Furthermore, in rotary engines for automobiles, leakage occurs between the seal ring and the side housing surface and enters the combustion chamber. The engine oil that has entered in this way is burned and consumed within the combustion chamber. The conventional methods for measuring engine oil consumption are to measure the oil level in the engine oil pan before driving, or to measure the oil level in the engine oil pan before driving, or to measure the oil level before driving. Insert the
After driving, measure the oil level in the same way, or drain the oil and measure the total amount, then subtract the value after driving from the value before driving and divide the value by the mileage to find the oil consumption. was.

However, this method requires quite a long period of operation for measurement, and since oil adheres to various parts of the engine, the reproducibility of the data is poor, and only very rough data can be obtained. However, it was not possible to determine the consumption amount for each operating condition, especially for each operating condition such as acceleration and deceleration, or the consumption amount for each cylinder.

For these reasons, conventional measurement methods have drawbacks in terms of measurement accuracy, analysis ability, measurement efficiency, etc., and it may not be possible to fully investigate the cause of problems such as excessive engine oil consumption. .

Furthermore, at the laboratory stage, radioactive substances are added to the oil.
There is also a method of measuring oil consumption by measuring the concentration of radioactive substances in the exhaust gas using a Geiger counter, but this method requires experts to handle radioactive substances, lacks versatility, and is difficult to use in factories. It was difficult to carry out bench tests.

This invention was made in view of the above-mentioned points, and it is possible to easily and quickly measure the engine oil consumption of the entire engine or each cylinder with high accuracy and reproducibility in a factory bench test or the like. The purpose is to do so. Therefore, when the engine is operated with sulfur-free fuel or fuel with a known sulfur concentration, the sulfur contained in the engine oil or intentionally added is emitted with the exhaust gas as the engine oil is consumed. In addition to detecting the sulfur concentration, the exhaust gas of the engine is mixed with air through a constant volume sampling device and released, and the flow rate of the exhaust gas is calculated from the flow rate of the mixed gas and the dilution rate of the exhaust gas in the volumetric sampling device. The weight of sulfur emitted along with the exhaust gas is calculated from the detected sulfur concentration and the specific gravity of exhaust gas and sulfur content, and the amount of engine oil consumed is determined based on the weight of the sulfur content. It provides a method for measuring quantities. Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a block diagram of an exemplary apparatus for implementing the method of measuring engine oil consumption according to the present invention. 1 is a 4-cylinder engine that uses as much sulfur-free fuel as possible (
Although it is desirable to operate on fuel with extremely low sulfur or known sulfur concentration, in which case correction will be required in the arithmetic circuit described later.

As for engine oil, the sulfur content is determined according to the sensitivity of the sulfur analyzer, such as di-yuichisha butyl di-sulfide (
DitetiaryButyDisulfide)
or lubricate engine oil with appropriate sulfur content.

Exhaust gas from the engine 1 passes through a muffler 3 from an exhaust pipe 2 and then passes through a connecting pipe 5 via a three-way switching valve 4 to be supplied to a CVS (constant volume sampling) device 1, or the three-way switching valve 4 switches If the gas is released into the atmosphere, it passes through the discharge pipe 6 and the catalytic converter 6a and is released into the atmosphere.

On the other hand, the exhaust gas from each cylinder passes through the exhaust pipes 7a to 7d, respectively, and only the exhaust gas from one to three cylinders selected by the sampling valve device 8 having the respective switching valves 8a to 8d passes through the connecting pipes 5a and 5. is supplied to the CVS device 10 via.

At this time, the exhaust gas from the remaining cylinders passes through the exhaust pipe 2 and is discharged into the atmosphere through the discharge pipe 6 because the switching valve 4 is switched as will be described later. Reference numeral 9 denotes a valve controller that controls the three-way switching valve 4 and the sampling valve device 8, and when measuring the total amount of engine oil consumption by all cylinders, each switching valve 8a to 8 of the sampling valve Hishitaka 8 is used. A switching valve is installed so that 8d is guided to the entire exhaust pipe 2, and a three-way switching valve 4 is connected to the exhaust pipe 2.
and the connecting pipe 5 are passed through.

In addition, when trying to measure the engine oil consumption for each cylinder, the three-way switching valve 4 should be switched so that the exhaust pipe 2 and the discharge pipe 6 are connected to each other, and the measurement should be made among the switching valves 8a to 8d. Only one to three cylinders corresponding to the cylinders are switched so that the exhaust gas therefrom is guided to the connecting pipe 5a.

In this way, only the exhaust gas of the cylinder to be measured is supplied to the CVS device 10 via the connecting pipes 5a and 5, and the exhaust gas of other cylinders is supplied to the exhaust pipe 2, the discharge pipe 6, and the catalyst comparator 6.
is released into the atmosphere through a. The sulfur concentration in the exhaust gas is determined in leg units by analyzing the exhaust gas led through the extraction pipe 5b branched from the connecting pipe 5 using the sulfur analyzer 11.

The recorder 12 records this sulfur concentration economically, but this record is for reference in the present invention.
That is, when the engine 1 is operated in a driving pattern that reproduces road driving conditions, for example, in 10 modes as shown by solid lines ■ to ■ in FIG. Do as shown.

In this invention, as described above, the sulfur analyzer 11 connected to the extraction pipe 5b branched from the connecting pipe 5 measures the sulfur concentration S (chest) of the exhaust gas, and also detects the distance L (object) and measures it. Measuring the total amount of exhaust gas (total amount of exhaust gas flowing through the connecting pipe 5) V(〆) during the traveling time corresponding to the time interval t,
By calculating the following equation, for example, the weight of sulfur discharged per object traveled distance Sm (Y/Y) is calculated.

Sm (evening/enemy) = V (you) x S (traces) x ys (evening/end)
÷L (ship)...[1' In the above formula, ys represents the specific weight of sulfur.

However, it is difficult to directly measure the total flow rate V of exhaust gas, so in the embodiment shown in FIG. 1, a CVS (constant volume sampling) device 10 is used to determine the volume of exhaust gas, that is, the total flow rate. The mixed gas of air and exhaust gas in this CVS device 1 is supplied from the air intake port 10a and from the connecting pipe 5 by a positive displacement pump, such as a vane pump, with a volume Vo (d/rev) per rotation. The entire amount of scarlet is inhaled, the air and exhaust are combined, and the exhaust port 1
0b, and the flow rate of this mixed gas is Vmix=V depending on the rotation speed N of this vane pump.

×N(me) \ is determined, and in this case, the exhaust gas concentration in the air-fuel mixture, that is, the dilution rate, represents the total amount of exhaust gas V(〆). Therefore, in order to obtain the dilution rate of this exhaust gas, a high concentration CO2 meter 13 connected to the extraction pipe 5b is used to determine the concentration of carbon dioxide (C02) as a representative component for only the exhaust gas at the inlet of the CVS device.
At the same time, the low concentration C02 meter 14 measures the carbon dioxide (C02) concentration at the outlet of the CVS device, that is, the diluted exhaust gas (this is referred to as B%), and the dilution rate is calculated. The dilution factor n can be determined by calculating B/A using the device 15.

Incidentally, the dilution rate is about 0.1. The total flow rate Vmix of the mixed gas measured in this way (pump rotational speed N in this case), dilution rate n, sulfur concentration S (trace) at the inlet of the CVS device, and specific weight ys of sulfur, and the odometer 17 The sulfur emission heavy calculation unit 16 performs the following calculations based on the data such as the traveling distance L, which is calculated at each set interval based on the engine rotational speed and gear shift position, and calculates the emissions per fence for the traveling distance at each point in time. Calculate the sulfur weight Sm. Sm (evening/ship) = Vmix (cane) x S (skin) x ys (evening/end) x
n÷L (ship)...[2' By displaying or recording this exhaust sulfur weight Sm as it is as data 18 and dividing this recorded value by the known sulfur content rate, the accurate engine oil consumption can be determined. Furthermore, by dividing these accumulated or integrated weights by the accumulated mileage, and dividing this by the known sulfur content, the average engine oil consumption over the entire mileage can be determined.

Reference numeral 19 denotes an oil consumption amount calculator that automatically performs the above calculations. In addition, when fuel such as gasoline contains sulfur, the sulfur concentration S is determined by the sulfur concentration S in relation to the fuel flow rate when calculating the formula [11 or {2] by the sulfur emission weight calculator 16. It is necessary to correct the value of (trace).

Further, the dilution rate calculator 15, the sulfur emission weight calculator 16, and the oil consumption calculator 19 may each use, for example, a microcomputer in which a central processing unit CPU for performing arithmetic processing, and storage devices RAM and ROM are housed in one chip. This can be done extremely easily and compactly with a single chip. The three-way switching valve 4 and the sampling valve device 8 are controlled by the valve controller 9, and the exhaust gas from each cylinder is transferred to the connecting pipe 5a.
It is also possible to measure the engine oil consumption for each cylinder by sending the oil to the connecting pipe 5 via the cylinder. As described above, according to the method of the present invention, it is possible to measure and record instantaneous and continuous values of the weight of exhaust sulfur in exhaust gas, which has an accurate correlation with engine oil consumption under any operating conditions.
In addition, it is also possible to measure and record the amount of engine oil consumed per mileage depending on the driving mode.

The measurement time is short, and data reproducibility and reliability are significantly improved. Furthermore, it is possible to measure not only the oil consumption of the entire engine but also the consumption of each cylinder. This will greatly contribute to the investigation of causes and countermeasures for problems such as excessive engine oil consumption.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG.
The figure is a diagram showing the relationship between 10-mode operation and the sulfur concentration (skin) in the exhaust gas at that time. DESCRIPTION OF SYMBOLS 1... Engine, 2... Exhaust pipe, 3... Muffler, 4... Three-way sliding door valve, 5, 5a... Connecting pipe, 5b...
Extraction pipe, 6... discharge pipe, 7a, 7b, 7c... exhaust pipe,
8... Sampling valve device, 9... Valve controller, 10
...CVS device, 11...Sulfur analyzer, 12...Recorder, 13...High concentration CO2 meter, 14...Low concentration C0
2 total, 15... dilution rate calculator, 16... sulfur emission weight calculator, 17... odometer, 19... oil consumption calculator. Figure 1 Figure 2

Claims (1)

[Claims] 1. The engine is operated with sulfur-free fuel or fuel with a known sulfur concentration, and the sulfur contained in or added to the engine oil is emitted with the exhaust as the engine oil is consumed. At the same time, the concentration of sulfur content is detected, and the exhaust gas of the engine is mixed with air through a constant volume sampling device and released, and the exhaust gas is determined based on the flow rate of the mixed gas and the dilution rate of the exhaust gas in the constant volume sampling device. engine oil consumption How to measure quantities. 2 Adjust the dilution rate of the exhaust gas to the CO in the constant volume sampling device.
The method for measuring engine oil consumption according to claim 1, wherein the engine oil consumption is determined by the ratio of the CO_2 concentration and the CO_2 concentration at the engine exhaust outlet.