JP2000213367A - Cleaning method for intake system and combustion chamber of automobile engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the operation without taking labor for disassembling and assembling an engine and to provide good cleaning effect without generating knocking harmful to the engine. SOLUTION: An air duct provided between an intake manifold 1 and an air cleaner is detached from the intake manifold 1, and cleaning fluid is injected, in the engine started state, toward the inside of the intake manifold 1 through a mechanical breakup tip 5 attached to an outlet of a tubular nozzle 4 continuous with a cleaning fluid container 6, in the form of fine mist so as to be uniformly dispersed in the intake manifold. Therefore, the injected cleaning fluid is burnt in the engine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cleaning method for cleaning an intake system and a combustion chamber of a diesel vehicle engine.

[0002]

2. Description of the Related Art In general, the intake system and combustion chamber of a diesel vehicle engine are subject to oil contamination,
There is a possibility that carbon, dust, dust, etc. may adhere. These deposits deteriorate the fuel combustion conditions of the diesel vehicle engine, causing an increase in black smoke in exhaust gas and a decrease in engine output. Therefore, it is necessary to perform cleaning in order to function without these obstacles.

[0003] As a method of cleaning the intake system and the combustion chamber of such a diesel automobile engine, a method of disassembling and cleaning the engine is known. This cleaning method
Although the intake system and the combustion chamber can be sufficiently cleaned, a skilled technique and a great deal of labor are required for disassembling and assembling the engine.

[0004] Another cleaning method is as follows. FIG. 1 is an explanatory diagram of a main part of a diesel vehicle engine according to the present invention, and FIG. 3 is an explanatory diagram of an embodiment of an apparatus for performing a conventional cleaning method. FIG.
The same reference numerals in FIG. 3 indicate the same parts.

[0005] (A) With the air duct 3 provided between the intake manifold 1 and the air cleaner 2 removed from the intake manifold 1, and with the engine running,
As shown in FIG. 3, a cleaning method in which a cleaning agent is injected from an inlet of an intake manifold 1 using a tubular nozzle 4 attached to a cleaning agent container 6.

(B) After the fuel inflow is cut off and the fuel is extracted from the fuel injection nozzle, the air duct 3 is removed from the intake manifold 1 and cranked, as shown in FIG. 3, from the inlet of the intake manifold 1. A cleaning method of injecting a cleaning agent using the tubular nozzle 4 attached to the cleaning agent container 6.

[0007] In any of the above methods, the cleaning agent injected or left in the intake system and the combustion chamber after cleaning is burned in the engine.

[0008]

However, in a diesel vehicle engine, fuel ignition is caused by spontaneous ignition due to a temperature rise due to air compression. Delays can occur and severe knocking can occur, which can cause engine damage. Therefore, the conventional method has the following problems.

In the method (a), since the cleaning agent is sprayed in the form of a stick, a mist or a foam close to a stick because the tubular nozzle 4 is used, the cleaning agent is uniformly applied to a plurality of combustion chambers A to D. It is difficult to inject the cleaning agent. Therefore, the ignitability of the fuel is degraded by the detergent excessively injected to one side of the specific combustion chamber, causing severe knocking.

In the method (b), there is no danger of knocking, but the fuel hose must be removed in order to shut off the inflow of fuel and extract fuel from the injection nozzle.
Skills are required for each work of removal and installation, which is troublesome and troublesome.

Therefore, in general, cleaning of the intake system and the combustion chamber of a diesel vehicle engine is hardly performed.

The present invention has been made in view of the above circumstances, and has as its object to provide a method for cleaning a diesel vehicle engine more safely and easily.

[0013]

Means for Solving the Problems As a cleaning method for solving the above-mentioned problems, a means adopted by the present invention is to remove an air duct provided between an intake manifold and an air cleaner from the intake manifold and start the engine. Thus, the cleaning agent is characterized by being injected into the intake manifold entrance into the interior in the form of a mist that is fine and spreads uniformly so as to uniformly spread inside the intake manifold.

Injecting the cleaning agent uniformly into a plurality of combustion chambers by injecting the cleaning agent in a fine and mist-like form that spreads evenly inside the intake manifold with the engine running. Can be. This can prevent intense knocking caused by the excessive amount of cleaning agent entering one combustion chamber in one direction.

[0015] A method of forming a mist with a fine size and spread evenly inside the intake manifold is as follows.
An aerosol, a spray, an airless gun, an ultrasonic method, and the like are conceivable. The finer the fog, the better, and the spread of the spray needs to be spread to some extent so as to spread and fill the inside of the intake manifold uniformly.
If the amount of the cleaning agent injected per unit time is too large, knocking occurs.

When an aerosol is used, LPG is preferable as a propellant, but since the ignition point of LPG is higher than that of fuel, LPG is one of the causes of knocking. However, when injected in the form of fine mist, the fine mist cleaning agent that is present simultaneously with LPG evaporates quickly,
Since the ignition point of the entire air-fuel mixture is lowered, knocking is suppressed. Addition of a cetane improver such as 3-pentanol to the detergent is also effective in suppressing knocking. Further, the pressure may be adjusted by a compressed gas or the like.

[0017]

Next, an embodiment of the method of the present invention will be described with reference to an embodiment shown in the drawings. FIG. 2 is an explanatory view of one embodiment of an apparatus for implementing the method of the present invention according to claim 1. In the drawing, a cleaning agent container 6 is introduced from the inlet of the intake manifold 1 from which the air duct 3 (FIG. 1) is removed.
It is the same as the conventional example (FIG. 3) that the cleaning agent is injected through the tubular nozzle 4 attached to the combustion chamber and then goes to the combustion chamber (not shown).

In the present invention, a mechanical break-up tip 5 is attached to the tip of the tubular nozzle 4. The mechanical break-up chip 5 has a mechanism for generating a spiral rotational force by a plurality of grooves when the liquid passes through the inside of the chip, thereby making the spray finer.
The mechanical break-up chip 5 allows the cleaning liquid sent from the cleaning agent container 6 through the tubular nozzle 4 to be discharged in the form of a mist that is fine and spreads evenly inside the intake manifold. It was made.

As described above, the cleaning agent injected in the form of a mist that is fine and spreads so as to spread uniformly inside the intake manifold is uniformly applied to the plurality of combustion chambers A to D while cleaning the inside of the intake manifold. And then burnt after cleaning each combustion chamber.

After the completion of the injection of the cleaning agent, emptying is performed intermittently until no white smoke is exhausted, and the cleaning agent remaining inside the engine is burned, and the process ends.

When the engine is cold, it is more preferable to warm up the engine by idling before injecting the cleaning agent.

In the above-described embodiment, the embodiment in which the mechanical breakup tip 5 is attached to the tip of the tubular nozzle 4 connected to the cleaning agent container 6 has been described. A nebulizer that sucks and atomizes a cleaning agent (liquid) with a negative pressure generated by an increase in the flow velocity of air in a constricted portion in a conduit, an airless gun that pushes a cleaning liquid by applying pressure to a liquid in a container, It is also possible to inject the cleaning agent in the form of a mist that is fine and spreads uniformly inside the intake manifold by using a method such as atomization by applying ultrasonic waves at the outlet of the liquid.

Next, the effect of the present invention will be described with reference to the results of a comparative test comparing the above-described embodiment with the conventional example.

(Test Method) In the test, a car equipped with a Toyota 2C engine that had run 143,000 km and a car equipped with a Nissan CD17 engine that had run 152,000 km were washed by the method according to the embodiment, and the washing effect and injection were performed. After confirming the presence or absence of knocking at that time, a cleaning agent was injected by the method of the conventional example, and the presence or absence of knocking was confirmed.

To confirm the cleaning effect, the engine was disassembled before and after the use of the cleaning agent, and changes in the state of contamination of the intake manifold and the combustion chamber were visually confirmed.

As a cleaning agent, an aerosol container was filled with 96 ml of undiluted solution of an engine conditioner (intake system / combustion chamber cleaning agent for gasoline vehicle engines made by Nippon Birds) and 24 ml of propane as a propellant. The spray amount adjusted to 6.5 to 7.5 g per 10 seconds was used.

(Cleaning effect of the embodiment) Table 1 shows the cleaning effect of the embodiment. ◎: Adhered dirt has been removed ○: Adhered dirt has been considerably removed

(Presence / absence of knocking during injection in Examples and Conventional Examples) Table 2 shows presence / absence of knocking during injections in Examples and Conventional Examples. ○… No knocking ×… Intense knocking

As is clear from Tables 1 and 2, in the cleaning performed by the cleaning method of the present invention, knocking harmful to the engine can be prevented and a good cleaning effect can be obtained. Was.

[0030]

As described above, according to the present invention,
In a cleaning method of injecting a cleaning agent into an intake manifold of a diesel vehicle engine to clean an intake system and a combustion chamber, an air duct provided between the intake manifold and an air cleaner was removed from the intake manifold, and the engine was started. In this state, disassemble and assemble the diesel car engine by injecting the cleaning agent into the intake manifold in the form of a mist that spreads finely and evenly inside the intake manifold. Good cleaning can be achieved without trouble and without harmful knocking of the engine.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a main part of a diesel vehicle engine according to the present invention.

FIG. 2 is an explanatory view of an apparatus for carrying out the cleaning method of the present invention.

FIG. 3 is an explanatory view of an apparatus for performing a conventional cleaning method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Intake manifold 2 Air cleaner 3 Air duct 4 Tubular nozzle 5 Mechanical breakup tip 6 Cleaning agent container

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[Procedure amendment]

[Submission date] February 8, 1999 (1999.2.8)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

While the engine is running, the cleaning agent is
The cleaning agent can be uniformly injected into a plurality of combustion chambers by injecting the cleaning agent in a mist state which spreads evenly inside the intake manifold. This can prevent intense knocking caused by the excessive amount of cleaning agent entering one combustion chamber in one direction.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is an explanatory view of a main part of Lud diesel automobile engines involved in the present invention.

FIG. 2 is an explanatory view of an apparatus for carrying out the cleaning method of the present invention.

FIG. 3 is an explanatory view of an apparatus for performing a conventional cleaning method.

Claims (1)

[Claims] In a cleaning method for cleaning a suction system and a combustion chamber by injecting a cleaning agent into an intake manifold of a diesel vehicle engine, an air duct provided between the intake manifold and an air cleaner is removed from the intake manifold. , While the engine is running, the cleaning agent is injected into the intake manifold in the form of a mist that is fine and spreads evenly inside the intake manifold. How to clean the intake system and combustion chamber.