JPH01112139A - Oil consumption detector for engine - Google Patents

Abstract

PURPOSE:To improve accuracy by providing an NOX cracking device to a sampling gas introducing system on the upper stream of an SOX analyzer in an engine exhaust gas. CONSTITUTION:The fuel F from a fuel tank 19 is subjected to removal of sulfur components in a sulfur removing device 18 and is supplied in this state to an engine 1 where the fuel is burned. The combustion gas is discarded through an exhaust manihold 2 and an exhaust pipe 16 to the outside. Oil is burned as well together with the fuel F in the engine 1 and the gaseous SOX formed by the combustion of the sulfur components in the oil co-exists in the exhaust gas and, therefore, the oil consumption is detected by measuring the concn. of the SOX. The measurement of the concn. of the SOX is executed by ending the sampling gas G from the manihold 2 through the NOX cracking device 4 to the SOX analyzer 5. The NOX which is the disturbing component in the SOX analysis is thus removed and the measurement with the high accuracy is enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an engine oil consumption detection device.

(Prior Art) Various methods have been devised in the past to detect the amount of engine oil consumed in automobiles. The amount of SOx measured by tip photometric analysis
A method of detecting oil consumption by measuring it with an analyzer has already been proposed (Japanese Patent Laid-Open No. 55-6234).
(See Publication No. 3).

(Problems to be Solved by the Invention) Generally, automobile exhaust gas contains nitrogen oxides (hereinafter referred to as NOx) in addition to SOx.
x acts as an interfering component with respect to SOx concentration detection by the SOx analyzer, and tends to lower the detected SOx concentration value. Therefore, as in the above-mentioned known example, when using the SOx analyzer for leaking engine oil during consumption,
It is equipped with a built-in NOx concentration detector that detects the NOx concentration in exhaust gas, and a correction coefficient corresponding to the NOx concentration measured in advance by the NOx concentration detector is calculated by the SOx analyzer.
A method is adopted in which the actual 5Oxi)1 degrees in the exhaust gas is calculated by multiplying the detected Ox concentration value. However, depending on the engine operating conditions, the NOx concentration in the exhaust gas may change drastically, and in that case, the response speed of the NOx concentration detector may not be able to keep up with it, so there may be an error in the measured value of 5Oxi degrees. There was a problem in that it caused the occurrence of In addition, in addition to the SOx analyzer, an expensive NOx concentration detector is required.
There was also the problem of inevitable cost increases.

The present invention has been made in view of the above points, and aims to improve the accuracy of SOx analysis by decomposing and removing NOx components in the sampling gas introduced into the SOx analyzer in advance. It is something.

(Means for solving the problems) In the present invention, as means for solving the above problems,
In an engine oil consumption detection device configured to detect SOx contained in engine exhaust gas with a SOx analyzer and calculate oil consumption based on the detected value, The sampling gas introduction system is equipped with a NOx decomposition device that decomposes and removes NOx contained in the sampling gas.

(Function) In the present invention, the following effects can be obtained by the means described in -1-.

That is, the NOx components contained in the sampling gas introduced into the SOx analyzer are
SOx is decomposed and removed by the NOx decomposition equipment
The SOx concentration in the sampling gas that does not contain NOx components that act as interfering components in the analysis will be measured by the SOx analyzer, and the accuracy of the SOx analysis will be significantly improved.

(Embodiments) Hereinafter, some preferred embodiments of the present invention will be described with reference to the attached drawings.

Embodiment 1 FIGS. 1 and 2 show an engine oil consumption detection device according to Embodiment 1 of the present invention.

As shown in FIG.
a combustion chamber 3 for completely burning unburned charcoal 1, etc.);
N for decomposing and removing NOx components contained in the sampling gas G that has been completely combusted in the combustion chamber 3.
NOx decomposition device 4, NOx decomposition device 4, etc.
5Oxi in sampling gas G whose components have been decomposed and removed
These devices are sequentially connected via appropriate piping 6, 7, 8 to form a sampling gas introduction system A.

That is, in this embodiment, the =4-NOx decomposition device 4 is attached to the sampling gas introduction system A upstream of the SOx analyzer 5. Note that the sampling gas G is suctioned and collected by a metering pump 9 interposed in the middle of the piping 8.

In the case of this embodiment, the NOx decomposition device 4 includes a decomposition chamber 10 interposed in a sampling gas introduction system A indicated by 11 "j,"
and a supply means 11 for supplying isocyanate gas HN CO to the decomposition chamber IO.

The isocyanate gas HN 2 CO exhibits an extremely large NOx decomposition ability under predetermined temperature conditions.

The mechanism of NOx decomposition will be explained in detail below.

Isocyanic acid 1-I N CO is thermally decomposed at 400'C as shown in the following equation.

HN CO− → N H+ CO(]) The thus generated N I (and No gas react as shown in the following formula, and N
Contributing to the decomposition and removal of o components +5. -4-ru4,2 N H+
2 N O → 11p +2 N, O (2) N20+H
2-→N, +H20 (3) In addition, surplus isocyanate HNCO that does not participate in the - reaction reacts as shown in the following formula and contributes to the decomposition and removal of No and CO.

2 HN CO+ H2→2NH7+2CO(4)N
I(2+ N O→N, H+OH→N2+H20(5)
20 H+ 2 CO + I (2+ 2 CO2 (6) By the way, 700 to 800 ppm of isocyanate gas T-TN CO is added to the air flow of NO scum I000 ppm,
As a result of investigating the NOx decomposition ability by changing the ambient temperature,
As shown in the characteristic diagram shown in FIG. 3, it was found that No was almost completely decomposed and removed at a temperature of 40Q°C or higher. From this fact, the temperature of the decomposition chamber 10 is 400 to 450°C.
It is desirable to keep the temperature constant.

As the supply means 11, isocyanic acid I is thermally decomposed.
An isocyanic acid generator containing cyanuric acid (HNCO) 3 that produces N GO is employed.

The isocyanic acid generator II is equipped with a heater 13 whose output is controlled by the control unit 12, and cyanuric acid (HN CO) 3 heated to 330°C or higher by the heater 13 is generated as shown in the following formula. It is designed to thermally decompose to produce isocyanate gas HNCO.

(HNCO)3→3HNCO) The pressure sensor 14 detects the gas pressure generated at this time, and feeds back the detected value to the control unit 12 to control the temperature of the heater 13 and The internal waste pressure is kept constant. Incidentally, an excess amount of isocyanate gas I-INCO generated in the isocyanate generator 11 is disposed of into the exhaust pipe 16 of the engine 1 via the constant pressure valve 15.

Therefore, the gas phase portion of the isocyanic acid generator 1.1 is
It is connected to the pipe 7 upstream of the decomposition chamber IO via the supply pipe I7, and the isocyanate gas HNCO supplied via the supply pipe 17 is mixed with the sunbrink gas G introduced from the pipe 7. They merge and flow into the decomposition chamber 10. The amount of isocyanate gas HNCO supplied is determined by the isocyanate gas pressure in the isocyanate generator Il and the flow rate of sampling gas G. It is desirable that the amount be controlled to be as small as possible, and the amount is sufficient to decompose the NO4 that is expected to be present.

The SOx analyzer 5 and 1. Therefore, in this example, the SOx gas in the combustion gas is analyzed by analyzing the tip of the SOx gas in the combustion gas.
Although a tip photometer configured to detect the Ox concentration is employed, one using the SOx absorption solution conductivity method may also be employed.

Furthermore, in this example, the SOx component produced by combustion of the sulfur component contained in the fuel is SOx
In view of disturbing the SOx concentration detected value in the analyzer 5, a sulfur removal device I8 is installed in the fuel supply system B of the engine 1.
is used to remove sulfur components contained in the fuel in advance.

That is, the sulfur removal device 18 is interposed in the fuel supply system B that extends from one fuel tank to the carburetor 21 via the fuel pump 20. The sulfur removal device 18, as shown in FIG.
and a cooler 23. The sulfur removal container 22
Copper fibers 24 whose surfaces have been activated with nitric acid or the like and then washed with water and acetone are filled with a substance that is equivalent to the fuel r> and does not contain sulfur.1. This prevents the copper fibers 24 from being oxidized by oxygen in the air. In addition, the same effect can be expected by using other metals such as stainless wool with copper plating on the surface, or metal fibers that easily react with sulfur, in place of the 111J copper fibers. can.

In general, the sulfur removal container 22 is of a cartridge type, and can be replaced between valves 25 and 26 when sufficient sulfide is generated on the surface of the copper fibers 24. , the sulfur removal container 22 is maintained at a high temperature within a range where the fuel F does not boil in order to promote the sulfidation reaction caused by sulfur, and the cooler 23 cools the fuel IZIi'' heated in the sulfur removal container 22. always 〆1'1
It has the effect of cooling by as much as 1 no.

Next, the operation of the oil consumption amount detection device shown in FIG. 1 will be explained.

Fuel F from the fuel tank 19 is supplied to the engine 1 in a state in which sulfur components have been removed by the sulfur removal device 18,
The combustion gas is combusted in the engine 1 to generate power using the combustion energy, and the combustion gas is disposed of to the outside via the exhaust manifold 2 and the exhaust pipe 16. At this time, in the engine 1, the oil is also combusted together with the fuel F, and the exhaust gas contains SO produced by the combustion of the sulfur component contained in the oil.
x gas will be mixed. A part of this exhaust gas is taken as a sampling gas G from the exhaust manifold 2, and the SOx concentration is measured according to the procedure described below.

First, residual organic matter contained in the sampling gas G sucked and sampled from the exhaust manifold 2 by the metering pump 9 is completely combusted in the combustion chamber 3 and removed. Thereafter, the sampling gas G is sucked from the combustion chamber 3 toward the decomposition chamber 10 that constitutes the NOx decomposition device 4, but since this sampling gas G is an isothermal, fixed-quantity gas flow, it is injected into the isocyanic acid generator 11. A certain amount of isocyanic acid 1-(N OC is added through the connected supply pipe 17 and enters the decomposition chamber 10. In the decomposition chamber IO, the sampling gas G and isocyanic acid IT N OC are sufficiently mixed. Then, NOx is decomposed and removed by the reactions shown in the above-mentioned reaction formulas (1) to (3).
The excess isocyanic acid 1-[NOC that was not converted into 1-[NOC] is thermally decomposed by itself into CO, N, H, O, etc. by the reactions shown in the above-mentioned reaction formulas (4) to (6). The sampling gas G from which NOx has been decomposed and removed is guided to the SOx analyzer 5, and the SOx analyzer 5 measures 5OXa degrees. The oil consumption amount is calculated from the SOx concentration thus obtained, the sampling gas amount, and the exhaust gas amount.

As described above, according to this embodiment, NO contained in the sampling gas G supplied to the SOx analyzer 5
Since the x component is decomposed and removed in advance, SO
This makes it possible to perform SOx analysis in the absence of NOx, which acts as an interfering component in x analysis, thereby improving the accuracy of SOx analysis and, in turn, making it possible to accurately measure oil consumption.

Embodiment 2 FIG. 4 shows the main parts of an engine oil consumption detection device according to Embodiment 2 of the present invention.

In the case of this embodiment, a silent discharge device is adopted as the NOx decomposition device 4, and the silent discharge device 4 has a pair of electrode plates 28, 28 in a case 27 configured to allow the sampling gas G to flow therethrough. They are configured to be opposed to each other with an insulating layer interposed therebetween. A high voltage of 15 to 20 KV is applied to these electrode plates 28, 28 via a neon transformer 29.

Note that the distance between the two types of electrode plates 28, 28 is maintained at a distance at which arc discharge is not severe and silent discharge occurs.

Therefore, in this silent discharge device 4, the bipolar plate 2
The NOx component contained in the sampling gas G is decomposed and removed by the high voltage applied during 8.28, but the NOx component contained in the sampling gas G is decomposed and removed.
If oxygen gas O7 coexists during x decomposition, the oxygen 0.
becomes ozone 03 under the influence of silent discharge, and as shown in reaction formula (8) below, nitrogen N produced by the decomposition of NOx and oxygen 02 are recombined to produce nitrogen oxides No. Furthermore, as shown in reaction formula (9) below, SO2 contained in the sampling gas G is converted into a compound So3 that cannot be measured by the SOx analyzer 5.

N2+Ot→2NO(8) 2SO, 10, -2SO3, (9) Therefore, in this embodiment, oxygen for adsorbing and removing oxygen 02 contained in the sampling gas G is provided on the upstream side of the silent discharge device 4. A removal device 30 is attached. The oxygen removal device 30 consists of a constant temperature bath 31 maintained at a high temperature of 500 to 600°C by the heating action of a heater 32.32, and copper fibers 32 filled in the constant temperature bath 31. When the sampling gas G passes through the fiber A 132, oxygen O7 in the sampling gas G reacts with copper Cu and is adsorbed and removed, as shown in reaction formula (10) in r. ing.

2Cu+Ot→2CuO(I O) The oxygen removal device 30 is also a cartridge type, and is configured so that when the copper fibers 32 are sufficiently oxidized and the oxygen removal ability decreases, it can be replaced with a new one. has been done.

Accordingly, the operation of the oil consumption amount detection device according to the illustrated second embodiment will be explained.

The sampling gas G that has been completely combusted in the combustion chamber 3 and has residual organic matter removed enters the oxygen removal device 30, where oxygen O7 contained in the sampling gas G is removed. Discharge device 4
to go into. In the silent discharge device 4, the NOx component in the sampling residue G is decomposed and removed, as described above. The sampling gas G from which NOx has been decomposed and removed in this way
is guided to the SOx analyzer 5 in the same manner as in the above-mentioned Example 1,
The SOx analyzer 5 measures 5Oxif1 degrees.

The thus obtained 5Oxa degrees and the amount of sampling gas,
The amount of oil consumed is calculated from the amount of exhaust gas.

As discussed above, in this embodiment as well, NO contained in the sampling gas G supplied to the SOx analyzer 5
Since the x component is decomposed and removed in advance, SO
This makes it possible to perform SOx analysis in the absence of NOx, which acts as an interfering component in x analysis, thereby improving the accuracy of SOx analysis and, in turn, making it possible to accurately measure oil consumption.

It goes without saying that the present invention is not limited to the configurations of the embodiments described above, and that the design can be modified as appropriate without departing from the gist of the invention.

(Effects of the Invention) As described in Section 2, according to the present invention, the amount of SOx contained in the engine exhaust gas is detected by the SOx analyzer, and the oil consumption is calculated based on the detected value. In the oil consumption detection device for an engine, the SOx
The NOx decomposition device that decomposes the NOx contained in the sampling gas is installed in the sampling gas introduction system of the analyzer-hi flow, so the NOx components contained in the sampling gas introduced into the SOx analyzer are , the NOx decomposition device installed in the first stream of the SOx analyzer has decomposed and removed the sample gas (:l SOx concentration must be measured by a SOx analyzer, and the analytical accuracy in '30x analysis has improved significantly.
This has the excellent effect of making it possible to accurately measure oil consumption.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a system diagram showing an outline of the engine oil consumption detection device according to Embodiment 1 of the present invention, and Fig. 2 shows the structure of the sulfur removal device in Fig. 1. 3 is a characteristic diagram of No decomposition by isocyanic acid, and FIG. 4 is a system diagram of main parts showing an outline of an engine oil consumption detection device according to Example 2 of the present invention. 1... ... Engine 4 ... NOx decomposition device 5 ... SOx analyzer 10 ... Decomposition chamber 11 ... Supply means (isocyanic acid generator ) A.
・・・・・・Sampling gas introduction system G・・・・・・
Sampling gas applicant Mazda Co., Ltd.

Claims (1)

[Claims] 1. The amount of sulfur oxides contained in engine exhaust gas is
An engine oil consumption detection device configured to detect the amount of oil consumed by an O_x analyzer and calculate the oil consumption amount based on the detected value, the apparatus comprising: An engine oil consumption detection device, characterized in that it is equipped with a NO_x decomposition device that decomposes and removes nitrogen oxides contained therein. 2. The NO_x decomposition device includes a constant temperature decomposition chamber configured to cause the sampling gas and isocyanate gas to react, and a supply means configured to supply isocyanate gas to the decomposition chamber. An oil consumption amount detection device for an engine according to claim 1.