JP2010169072A - Automobile exhaust pressure measuring instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust pressure measuring instrument easily measuring clogging of a device caused by degradation or damage of a catalyst mounted on an automobile for cleaning exhaust emission. <P>SOLUTION: A dial or digital type pressure gauge, an exhaust pulsation damping device, an adapter (7) appropriate for the kind of an O<SB>2</SB>sensor, a hose (4) connecting therewith, and an air coupler are combined and integrated, and are positioned upstream of an automobile exhaust device. The automobile exhaust pressure measuring instrument is attached to a mounting screw part of the O<SB>2</SB>sensor using the adapter (7), for measuring exhaust pressure caused by clogging of the exhaust device. The adapter (7) mounted on the exhaust device, a joint coupler (3), the hose (4), a cylindrical surge tank (2) having a hollow thereinside with a capacity of about 150 cc for suppressing pulsation occurring in an exhaust stroke, a mounting fitting (5), and the dial or digital type measuring instrument (1), are integrated. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to measurement of exhaust pressure that rises due to clogging of an exhaust device due to deterioration or melting, such as a catalyst for purifying exhaust gas mounted on an automobile.

Conventionally, whether or not the exhaust system is clogged, which is a cause of insufficient engine output, has been determined by removing a part or all of the exhaust system or by incising the vicinity of the catalyst and visually observing the inside.

Problems that patents try to solve

The above method is inefficient because it requires a lot of labor and time to remove the exhaust device.

Means for solving the problem

Without removing the exhaust device, using the remaining oxygen concentration detection sensor (hereinafter referred to as O ₂ sensor) attachment port upstream of the exhaust device, the automobile exhaust pressure measuring device of the present invention is attached, and the exhaust device upstream is clogged with catalyst or the like. The pressure that rises is expressed as a numerical value by a dial type or digital pressure gauge, and the quality of the exhaust system as a whole is judged.

Patent effect

Therefore, by using the measuring instrument of this patent, it is not necessary to remove or cut out the exhaust device, and the working time can be greatly shortened.
In addition, since it is a part that is constantly exposed to high temperatures, the mounting bolts may be deteriorated, and loss such as additional work due to breakage during attachment / detachment can be avoided.

Best mode for carrying out the patent

As shown in FIG. 1, the automobile exhaust pressure measuring device according to the present invention has a cylindrical volume of about 150 cc in an adapter 7, a joint coupler 3, a hose 4, and an internal cavity attached to the exhaust device, and generates pulsations generated in the exhaust stroke. The surge tank 2 to be suppressed, the mounting bracket 5, the pressure unit kgf / cm · mba · Mpa · Mpa · Psi · display, or the dial type or digital type pressure measuring device 1 · is integrally formed.
The material is adapter 7 metal, joint coupler 2 metal, mounting bracket 5 metal, hose 3 heat resistant rubber, surge tank 4 metal or resin

1 is an overall view of an automobile exhaust pressure measuring device according to the present invention attached to an exhaust device. It is an enlarged view of the motor vehicle exhaust pressure measuring device attachment part which concerns on this invention.

DESCRIPTION OF SYMBOLS 1 Dial type or digital pressure gauge 2 Surge tank 3 Joint coupler 4 Hose 5 Mounting bracket 6 Mounting bracket nut 7 Adapter 8 Gasket 9 O ₂ Sensor mounting screw 10 Exhaust device 11 Catalyst part A Exhaust flow direction [Detailed description] ( background)

Conventionally, it is a well-known fact among automobile personnel that, as a cause of automobile engine malfunction, exhaust resistance increases due to clogging due to catalyst melting, crushing, deterioration, etc., and acceleration performance and fuel consumption are significantly reduced. It is.
In addition, it has not been easy for car mechanics to find the conclusion that the cause of engine malfunction is clogged exhaust systems.
The reason for this is that it is easy to determine if it is completely clogged, but in the case of an engine malfunction caused by halfway clogging, there was no means for relatively easily ascertaining the presence or absence of clogging in the exhaust system. Therefore, it took a long time to pursue the cause.
So why does it take time to identify the cause? The procedure of the cause identification method in the conventional maintenance industry is described below.
[Method for judging clogging inside exhaust system]

There is a method in which a part of the exhaust device or the housing is removed and the inside is visually determined. However, recent automobiles have a tendency to integrate an exhaust system, and an increasing number of vehicles are structurally difficult to detach and detach.
Furthermore, there are many structures in which the entire exhaust system is twisted, and in some cases, the exhaust pipe may be cut open, and it takes a lot of time and labor to confirm. In addition, if the cause of the engine malfunction is not caused by the exhaust system, a series of work and time will be wasted and the person in charge of the work will be sought, and other causes of engine malfunction will be sought. It takes time to identify the cause.
[Method for judging clogging inside exhaust system]

As described above, most of the causes of the increase in exhaust resistance are due to catalyst deterioration, pulverization, melting damage, and the like.
Therefore, loosen the mounting part located in the upstream part of the catalyst and provide a gap, or remove a part of the device, for example, O ₂ sensor etc., let the exhaust escape from that part, and compare the state of the engine with the previous one It is a method to do.
However, this method is problematic because exhaust gas that does not pass through the silencer is emitted, so that a loud sound is generated at the same time as the engine is started and there is a risk of causing a fire.
In addition, this method is effective when considerable clogging exists in the exhaust system, but is difficult to determine in other cases.
[Method for judging clogging inside exhaust system]

Test another exhaust system in good condition on the same model.
Although this method can make a reliable determination, it is premised on the existence of an exhaust system of the same vehicle type, and further work such as attachment / detachment of the exhaust device of the vehicle is involved.

Hereinafter, the present invention will be described with reference to the drawings.
Remove the O ₂ sensor attached to the automobile exhaust system, select the adapter 7 according to the screw size of the O ₂ sensor of the present invention, and attach the automobile exhaust pressure measuring instrument of the present invention as shown in FIG. The engine is started and the exhaust pressure applied to the exhaust system is measured.
The normal values at that time are described below.
Engine rotation 600 ~ 900rpm Gear neutral 0.01 ~ 0.02kgf / cm
Engine rotation 3000rpm Gear neutral 0.05kgf / cm or less Engine throttle suddenly open Gear neutral 0.2 ~ 0.5kgf / cm
The above numerical values are the results of measuring normal values in gasoline automobiles. If a numerical value exceeding this value appears, it can be determined that clogging has occurred in any part of the exhaust system.
In addition, even if there is a difference between the manufacturer and the displacement, the normal value is not much different and does not become an obstacle to the determination.
Moreover, although the dial type pressure gauge of the pressure unit kgf / cm display was used for the said measurement, an mbar * Mpa * psi display dial type or a digital pressure gauge can also be used.
[Claims]

[Claim 1]
And the dial or digital pressure gauge, and the surge tank to the cylinder shape, and an adapter according to the type of the O ₂ sensor screws, hoses and connecting them, an integral joint coupler, located in an automobile exhaust system upstream It is an automobile exhaust pressure measuring device characterized in that it is attached to the mounting screw portion of the O ₂ sensor using an adapter and the exhaust pressure generated by clogging of the exhaust device is measured to determine the degree of clogging of the entire exhaust device. .

Claims (1)

A dial-type or digital-type pressure gauge, a cylindrical surge tank, an adapter according to the type of O ₂ sensor, a hose and a joint coupler for connecting them, and an O located upstream of the automobile exhaust system _2. An automobile exhaust pressure measuring device, which is attached to an attachment screw portion of a _two- sensor using an adapter and determines the degree of clogging of the entire exhaust device by measuring the exhaust pressure caused by the clogging of the exhaust device.

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