JP2518104B2 - White smoke measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to a white smoke measuring device capable of measuring white smoke emitted from a diesel engine at a constant temperature start.

(Prior Art) When a diesel engine starts at a constant temperature, engine exhaust becomes white smoke. This is because the diesel engine is cold, so the fuel injected into the combustion chamber of the engine is incompletely burned, and the exhaust gas contains a large amount of HC (hydrocarbon).
It is said that HC is mixed with cold air and cooled to form condensed particles that turn into white smoke.

(Problems to be Solved by the Invention) In order to evaluate such white smoke using the engine alone as in an actual vehicle, it is necessary to discharge all the exhaust gas discharged from the engine to the atmosphere. As described above, in order to release all the exhaust gas discharged from the engine to the atmosphere, not only a large blower is required, but also a large air conditioner for keeping the room temperature constant is required. Therefore, there is a problem that the device becomes large and the cost is high.

The present invention has been made in view of the above points, and an object thereof is to suck a part of exhaust gas discharged from an engine by a heating pump, pressurize it, and discharge it to the atmosphere by a certain amount, so that a small-sized device can be used in an actual vehicle. It is to provide a white smoke measuring device capable of evaluating white smoke similar to the above.

[Configuration of the Invention] (Means for Solving the Problems) A low greenhouse, an engine mounted in the low temperature chamber, a pipe for guiding exhaust gas discharged from the engine to the outside of the low temperature chamber, and a part of the pipe A pipe for taking out a part of the exhaust gas discharged from the engine connected to the pipe, a heating pump for heating and compressing the exhaust gas guided to the pipe, and a large number of nozzles connected to the discharge side of the heating pump. An apparatus for measuring white smoke, comprising: a multi-branched pipe; and a transmission type white smoke measuring device disposed on both sides of a passage for exhaust gas ejected from the numerous nozzles.

(Function) A part of the exhaust gas discharged from the engine is sucked and pressurized by the heating pump and is discharged to the atmosphere in a constant amount. At this time, exhaust gas is discharged from a large number of nozzles, and a transmission type white smoke measuring device (smoke meter) is arranged on both sides of the passage to measure white smoke. This allows white smoke to be evaluated with a small device using the same smoke meter as the actual vehicle.

(Embodiment) A white smoke measuring apparatus according to an embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 11 is a low temperature chamber. The low temperature chamber 11 is kept at room temperature at, for example, −20 ° C. by an air conditioner (not shown). A diesel engine 12 is mounted in the low temperature chamber 11. One end of a pipe 14 is connected to the exhaust manifold 13 of the diesel engine 12, and the other end is taken out to the outside of the low temperature chamber 11. A blower (not shown) is attached to the outside of the low temperature chamber 11 of the pipe 14 to facilitate exhaust of exhaust gas from the diesel engine 12 to the outside of the low temperature chamber 11.

Further, one end of a pipe 15 having a diameter considerably smaller than that of the above pipe is connected in the middle of the above pipe 14. A heating pump 16 is connected to the other end of the pipe 15. This heating pump
Reference numeral 16 is a pump for heating and compressing the exhaust gas sent through the pipe 15. The CH discharged from the diesel engine 12 is heated to prevent it from cooling and clogging the pump 16.

The discharge side of the heating pump 16 is provided with a multi-branch pipe 18 via a pipe 17.
Connected to one end of. This multi-branched pipe 18 has four nozzles a
~ D are provided. The transmission smoke meter 19 is arranged so as to sandwich the exhaust path discharged from the four nozzles a to d.

This transmission type smoke meter 19 is a projector 191 that emits light.
And a light receiver 192 disposed on the side facing the light projector 191.
Composed of and. Then, by detecting the amount of light detected by the light receiver 192, the projector 191 and the light receiver 1
The permeability of the exhaust gas emitted between 92 is detected.

As shown in FIG. 3, the distance between the light projector 191 and the light receiver 192 is equal to the exhaust pipe 31 when the engine is mounted on the vehicle.
The distance between the light emitter 321 and the light receiver 132 of the transmission type smoke meter 32 for measuring the white smoke of the exhaust gas emitted from the exhaust gas is set to be substantially equal.

An exhaust guide 20 is arranged downstream of the nozzles a to d, and an exhaust port 21 of the exhaust guide 20 is taken out of the low temperature chamber 11. A blower (not shown) is provided on the outer stream of the low temperature chamber 11 of the exhaust port 21.

Next, the operation of the embodiment of the present invention configured as above will be described. First, the diesel engine 12 placed in the low temperature chamber 11 is started. As a result, most of the exhaust gas discharged from the diesel engine 12 is discharged from the outside of the low temperature chamber 11 to the atmosphere via the pipe 15. Also, piping 14
A part of the exhaust gas discharged from the diesel engine 12 introduced into the pipe 15 branched from the middle of the
After being heated and sucked at 16, it is discharged through nozzles a to d via pipe 17. Then, the level of white smoke is detected by the transmission smoke meter 19.

In this way, when the transmission smoke meter 19 is used to detect white smoke, the detection level (indication value) of the smoke meter 19 is a white level in the optical path of the smoke meter 19 if the white smoke concentration is constant. Proportional to the length of smoke. Therefore, as shown in FIG. 3, when white smoke is measured with a smoke meter in an actual vehicle state, if a portion of exhaust gas is discharged from a single nozzle 41 as shown in FIG. It is possible to prevent the problem that the smoke meter 32 decreases and the indication value of the smoke meter 32 decreases.

According to the above-mentioned embodiment, the projector 191 of the smoke meter 19
Since it can be used at almost the same distance as that between the engine and the light receiver 192 as when the engine is mounted on the vehicle, the level of white smoke in the exhaust gas emitted from the diesel engine is mounted on the vehicle. Sometimes it can be evaluated in the same way.

In addition, although the white smoke measurement of the diesel engine is described in the above-described embodiment, the present invention can be applied to the measurement of white smoke emitted from other types of internal combustion engines.

[Effects of the Invention] As described in detail above, according to the present invention, the low temperature chamber, the engine mounted in the low temperature chamber, the pipe for guiding the exhaust gas discharged from the engine to the outside of the low temperature chamber, and the pipe A pipe connected to a part of the exhaust gas discharged from the engine, a heating pump for heating and compressing the exhaust gas guided to the pipe, and a large number of pipes connected to the discharge side of the heating pump. Since the multi-branch pipe with nozzles and the permeation type white smoke measuring instruments arranged on both sides of the passage of the exhaust gas ejected from the large number of nozzles are provided, white smoke similar to that of an actual vehicle A white smoke measuring device capable of evaluation can be provided.

[Brief description of drawings]

FIG. 1 is a schematic view showing a white smoke measuring device according to an embodiment of the present invention, FIG. 2 is a view showing a positional relationship between a nozzle and a smoke meter, and FIG. 3 is a white view when an engine is mounted on a vehicle. FIG. 4 is a view showing a smoke detection state, and FIG. 4 is a view showing detection of white smoke discharged from a single nozzle. 11 ... Low temperature room, 12 ... Diesel engine, 16 ... Heating pump, 18 ... Multi-branched pipe, a ... d ... Nozzle, 19 ... Transmission type smoke meter.

Claims (1)

(57) [Claims] 1. A low temperature chamber, an engine mounted in the low temperature chamber, a pipe for guiding exhaust gas discharged from the engine to the outside of the low temperature chamber, and a pipe connected to a part of the pipe to be discharged from the engine. A pipe for taking out a part of the exhaust gas, a heating pump for heating and compressing the exhaust gas guided to the pipe, a multi-branch pipe having a large number of nozzles connected to the discharge side of the heating pump, and a large number of these nozzles. A white smoke measuring device, comprising: a transmission type white smoke measuring device arranged on both sides of a passage for exhaust gas ejected from the exhaust gas.