JPS6037285B2 - How to measure lubricating oil consumption in internal combustion engines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for measuring the consumption of lubricating oil of an internal combustion engine used for wheels and the like.

Conventionally, methods for measuring lubricating oil consumption include a method of calculating it based on the weight difference of internal combustion engines (gravimetric method), and a method of adding a radioactive isotope (RI) to the lubricating oil and measuring the amount of isotope contained in the exhaust gas. A method for determining this value (RI method) was known.

However, the gravimetric method has drawbacks such as requiring a long time for measurement, poor accuracy, and inability to measure transient conditions such as acceleration and deceleration. Additionally, since the RI method uses radioactive materials, special equipment is required to prevent them from being released to the outside, and for this reason, it is difficult to carry out measurements while driving with an internal combustion engine mounted on wheels. Therefore, it is difficult to match the operating conditions of the engine on the test bench and the operating conditions of the engine, including acceleration and deceleration, when mounted on the axle, and the reliability of measured values during transients such as acceleration and deceleration is not sufficient. There are drawbacks. The purpose of the present invention is to be able to perform measurements with high accuracy in a short time even when the internal combustion engine is left in the vehicle.
Furthermore, it is an object of the present invention to provide a method for measuring lubricating oil consumption of an internal combustion engine that can also be measured during transient periods such as acceleration and deceleration.

The method for measuring lubricating oil consumption of an internal combustion engine of the present invention uses a substance that does not contain sulfur components as fuel, and operates the internal combustion engine using lubricating oil containing 0.5% by weight or more of sulfur. , the lubricating oil consumption of the internal combustion engine is determined by sufficiently diluting and mixing the exhaust gas of the internal combustion engine with air and then quantifying sulfur dioxide gas or sulfur oxide in the diluted gas exhaust. Hereinafter, embodiments of the present invention will be described in detail based on the accompanying drawings. FIG. 1 shows a flow sheet of the most typical example 1.

First, liquid fuel that does not contain sulfur components in the fuel tank.
For example, it is filled with isooctane, toluene, etc., or a mixture thereof. Next, lubricating oil having a sulfur content of 0.5 weight percent or more is supplied to the internal combustion engine 2. In this state, when the internal combustion engine 2 is operated under appropriate conditions,
The lubricating oil consumed within the internal combustion engine 2 is burned together with the fuel. Therefore, in lubricating oil. The sulfur component is oxidized and becomes sulfur dioxide gas, which is discharged from the exhaust pipe 3 together with the exhaust gas. Here, the reason why the lubricating oil has a sulfur content of 0.5% by weight or more is because in the quantitative analysis of sulfur dioxide gas, which will be described later, in view of the quantitative limit of the sulfur dioxide gas analyzer that is commonly used, even a concentration of this level is required. If so, it is possible to conduct sufficient analysis for practical purposes. Based on the fact that In addition, the iodine content of lubricating oil for internal combustion engines that is commonly used is 0.2 to 1.1.
Since it is a weight percent, lubricating oils containing 0.5 weight percent or more of a phosphor component are common. The exhaust pipe 3 is connected to a mixer 7 through a pipe 4, and the diluted air 5 is introduced into the mixer 7 through an air purifier 6 made of furnace paper and activated carbon. Mixed with dilution air.

The amount of dilution air shall be at least 8 times the amount of exhaust gas. The diluted exhaust gas is brought to a constant flow rate by a constant volume sampling system (CVS) 18. Part of the diluted exhaust gas is 4000
After passing through the collection pipe 8 heated above, the flow rate is controlled by a flow rate control valve 10 and guided to a sulfur dioxide gas absorption liquid 9 by a pump 11. A portion of this diluted exhaust gas is measured by an integrating flow meter 12. Here, the reason why the exhaust gas is sufficiently diluted and mixed is as follows. In other words, when sampling a portion of exhaust gas containing sulfur dioxide gas, the temperature of the exhaust gas decreases and moisture condenses, but if the exhaust gas is not sufficiently diluted with air, the sulfur dioxide gas components become condensed water. This is because the amount of sulfur dioxide gas that is taken in does not reach the sulfur dioxide gas absorbing liquid 9 and becomes a loss, causing a measurement error.
As mentioned above, the dilution air flow rate is 8 times the exhaust gas flow rate.
If it is more than twice as large, the loss of sulfur dioxide gas due to condensed water will be reduced to a practically negligible level. On the other hand, a part of the diluted air passes through the collection pipe 13, the flow rate of which is controlled by the flow rate control valve 15, and is led to the sulfur dioxide gas absorption liquid 14 by the pump 16.

A portion of this dilution air is measured by an integrating flowmeter 17.
Note that the sulfur dioxide gas absorption liquids 9 and 14 contain hydrogen peroxide solution, T
A CM solution or the like is used to quantify the sulfur dioxide gas concentration in the sulfur dioxide gas absorption liquid using the trine photometric titration method, the P-rozaniline method, or the like. The lubricating oil consumption amount A (ta'H) of the internal combustion engine per unit time can be determined by the following equation.

A: KV (CD) x 10-6/BE...
...'1'B: Sulfur content (weight fraction) in lubricating oil C
: Average sulfur dioxide gas concentration in diluted exhaust gas (ppm
) D: Average concentration of sulfur dioxide gas in diluted air (ppm) E: Measurement time (H) V: Total amount of diluted exhaust gas during measurement (evening) K: Weight of sulfur per unit volume of sulfur dioxide gas (Ta' Evening) Upper ceremony (1
11 Here, B and K are known, C is obtained from the integrated flowmeter 12 and the sulfur dioxide gas analysis value in the absorption liquid 9,
D can be determined from the integrated flow meter 17 and the sulfite analysis value in the absorption liquid 14, and V can be determined from the CVS 18.

The lubricating oil consumption amount F (Tanomono) of the internal combustion engine per unit traveling distance can be determined by the following formula.

F=KV(C-D)×10-6/BG...
(2-G: Distance traveled by the wheels during measurement (■)) FIG. 2 shows a flow sheet of Example 0 of the present invention.

1 is a fuel tank, 2 is an internal combustion engine, 3 is an exhaust pipe, 4 is a pipe,
5 is dilution air, 6 is an air purifier, 7 is a mixer, 8 and 13 are collection tubes, and 18 is a CVS, which is the same as in Example 1.

Hereinafter, only the differences from Example 1 will be described. A part of the diluted exhaust gas is led to a sulfur dioxide gas continuous analyzer 28 through a collection tube 8, and the concentration of sulfur dioxide gas is continuously determined.

On the other hand, a part of the diluted air is also led to the sulfur dioxide gas continuous analyzer 30 through the collection tube 13, and the concentration of sulfur dioxide gas is continuously determined. The instantaneous lubricating oil consumption day (multi/H) of the internal combustion engine can be determined by the following formula. H=KV(1-J)×
10-3/B. ......(3'1: Sulfur dioxide gas concentration in diluted exhaust gas (ppm) J: Sulfur dioxide gas concentration in diluted air (ppm) In the above formula '31, since K and B are known, sulfur dioxide Signals of gas concentration 1, J are sent from the sulfur dioxide gas continuous analyzers 28, 30, and signals of the diluted exhaust gas flow rate V are sent from the CVS 18 to the calculator 32.
are respectively inputted to the arithmetic unit 32 to perform the arithmetic operation of the above equation (3).

In this case, if necessary, the computation unit 32 simultaneously corrects the response speed of the sulfur dioxide gas continuous analyzers 28 and 30 and the time difference in the gas flow flowing between the sampling tubes 8 and 13. An appropriate interval between calculations is 0.1 to 1 second, and the calculation results are stored in the storage device 33 at each interval. Lubricating oil consumption M(
evening) can be calculated using the following formula.

t2M = Satoshi.

＾ 日 ．・・・．・・・． ...'4'L, t2: Arbitrary time during measurement (sec), where <t2 6t: Interval of calculation (sec), where 0.2<6t<1
The lubricating oil consumption amount determined in this manner at any given time interval is recorded on the output device 34.

In the above formula, if 1 is sufficiently larger than J, the concentration of sulfur dioxide gas in the diluted exhaust gas, that is, the output of the sulfur dioxide gas continuous analyzer 28, can be continuously recorded on the recorder 31. , it is possible to quantitatively clarify lubricant consumption. According to the present invention, measurements that conventionally required more than five hours can be carried out within about one hour, making the measurement time extremely short. Further, since the concentration of sulfur dioxide gas can be measured with relatively high accuracy, the amount of lubricating oil consumed can also be measured with high accuracy. Unlike the conventional RI method, there is no need to use radioactive substances, so there is no need for buildings, equipment, etc. to ensure safety associated with their use, and there are no restrictions on the measurement location. In particular, Example 1 is suitable for determining lubricant consumption in a short period of time with high accuracy, and Example D' is suitable for determining lubricant consumption during transients such as acceleration and deceleration, which was conventionally considered difficult. , suitable for determining the amount of lubricant consumed within an arbitrary period of time. As described above, the present invention will become an effective means for elucidating the lubricating oil consumption characteristics of internal combustion engines.

[Brief explanation of the drawing]

FIG. 1 is a flow sheet for explaining Example 1 of the present invention, and FIG. 2 is a flow sheet for explaining Example 0 of the present invention. DESCRIPTION OF SYMBOLS 1... Fuel tank, 2... Internal combustion engine, 3... Exhaust pipe, 5... Dilution air, 7... Mixer, 9, 14...
・Sulfur dioxide gas absorption liquid, 12, 17... Integrating flow meter,
18...CVS, 28,30...Sulfur dioxide gas continuous analyzer. Figure 1 Figure 2

Claims (1)

[Claims] 1. Operating an internal combustion engine using a substance that does not contain sulfur components as fuel and using lubricating oil that contains sulfur components,
After the exhaust gas of the internal combustion engine is sufficiently diluted and mixed with air, a portion of the rare gas is continuously sampled and sulfur dioxide gas or sulfur oxide is continuously determined. How to measure the consumption of.