JPH08189381A - Intake system washing method for automobile engine - Google Patents

Abstract

PURPOSE: To provide a washing method for an intake system of a automobile, engine, which is simple to wash and excellent in washing effect. CONSTITUTION: When the inside of an intake system including a throttle body 2 is washed, a purge hose connected to a pipe 7 which is connected to a purge port 6 provided in a throttle body 2 of a automobile engine with an electronic controlled fuel injector so as to suck evaporated gas from a fuel tank through a canister is disconnected from the pipe 7. Instead, a tube 12 connected to a detergent container 11 inserted and set to the pipe 1 through a silicon rubber adopter 13, and detergent is filled and injected into the throttle body 2 through the tube 12. The filled detergent is combusted inside the engine. Thus a labor time can be saved considerably as compared with that in conventional method, and a working time is shortened and an excellent washing effect is given.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning method for cleaning the inside of an intake system of an automobile engine with an electronically controlled fuel injection device.

[0002]

2. Description of the Related Art As shown in FIG. 2, an intake system of an automobile engine with an electronically controlled fuel injection device has a throttle body 2 having a throttle valve 1 which is linked to an accelerator pedal. 3 and the air duct 5 connected to it, and the other end (the left end in the figure)
Is connected to a fuel supply system including a fuel injection valve (not shown).

Further, the throttle body 2 is provided with a purge port 6 slightly upstream or downstream of the position where the throttle valve 1 is normally closed, and the purge port 6 is integrally connected to a pipe 7. To purge hose 8
Via a canister (absorption can for absorbing the passing gas by the filled absorbent) via the fuel tank 10 to the evaporative gas chamber 10a of the fuel tank 10. The fuel (gasoline) in the fuel tank 10 is pumped to the fuel supply system by the fuel pump 10b.

In the interior of the intake system of the automobile engine with the electronically controlled fuel injection device constructed as described above, oil stains, carbon, dust, etc. adhere to the inside of the intake system for a long period of time to cause the originally set movement of the throttle valve 1. This may impair the performance of the throttle valve 1 originally set, or may deteriorate the performance of other precision parts. Therefore,
It is necessary to perform cleaning in order for these to function without trouble.

Conventionally, as a method of cleaning the inside of the intake system of an electronically controlled fuel injection engine, there is the following method. 1. A method in which the air duct is removed from the throttle body and the cleaning agent is sprayed while aiming for dirt on the throttle valve and its surroundings. 2. As shown in FIG. 2, a method in which the air duct 5 connected to the throttle body 2 is slightly loosened, and a cleaning agent is sprayed from the gap toward the throttle valve 1 through a tube 12 connected to a cleaning agent container 11. In any of the above methods, the injected and injected cleaning agent is burned in the engine.

[0006]

[Problems to be Solved by the Invention] This method can be expected as a cleaning effect because the cleaning agent is directly sprayed onto the dirt. However, to remove the air duct 5,
Loosen the screw of the band 5a of the air duct 5 and pull out the air duct from the throttle body 2. However, due to the space of the engine room, it cannot be pulled out from the throttle body as it is, and the air cleaner 3
It is necessary to remove the cap metal fitting of the cap, remove the intake air temperature sensor 4 and other hoses in some cases, and then remove the air duct and the air cleaner cap integrally. Moreover, since it has to be reassembled, there is a problem in that such a series of work requires a considerable amount of labor and time. (See Fig. 2)

Further, 2. Method, throttle body 2
To obtain the gap between the air duct 5 and 1. Similar to the above method, the air duct 5 is displaced to the position just before it is pulled out from the throttle body 2, but this may also require the removal of the air cleaner cap, which again requires a lot of labor and time. Furthermore, when the tube 12 for the cleaning agent is inserted into the gap of the air duct 5, a pipe made of aluminum or the like having a diameter of about 3.5 mm may be formed into a U shape, and the tube may be inserted to be inserted as a tube guide 12a. In either case, if the tip of the valve does not face the center of the throttle valve 1, the cleaning performance will be biased, so there is a problem that it is necessary to pay attention so that the tip always faces the center.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the conventional method and to provide a cleaning method for an intake system of an automobile engine which is simple and has a good cleaning effect.

[0009]

In order to achieve the above object, the cleaning method according to the present invention uses a pipe connected to a purge port provided in a throttle body of an automobile engine with an electronically controlled fuel injection device for cleaning. It is characterized by injecting and injecting the agent into the throttle body in the form of aerosol to wash the intake system of the automobile engine.

[0010]

Since the present invention is constructed as described above,
The following effects occur. That is, when cleaning the throttle body of an automobile engine with an electronically controlled fuel injection device and other inside of the intake system, from the pipe connected to the purge port provided in the throttle body, remove the purge hose connected to the canister, and to the pipe, A tube connected to a cleaning agent container is connected to inject and inject the cleaning agent into the throttle body to clean the intake system of the automobile engine. The cleaning agent thus cleaned is burned inside the driven engine.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the method of the present invention will be described with reference to an embodying apparatus shown in the drawings. FIG. 1 is a sectional view of an essential part of an apparatus for carrying out the method of the present invention. In the figure, the same reference numerals as those shown in FIG. 2 designate the same or like parts.

In the figure, a throttle body 2 having a built-in throttle valve 1 is provided with a purge port 6 on the slightly upstream side when the throttle valve 1 is closed, and a pipe 7 is provided in the purge port 6. Canister 9 (FIG. 2) is integrally connected to the pipe 7.
The fact that the purge hose 8 (FIG. 2) to be connected to is connected is the same as the conventional example (FIG. 2).

According to the present invention, when cleaning the throttle body of the electronically controlled fuel injection type engine and other insides of the intake system, the pipe 7 integrally connected to the purge port 6 is connected to the canister 9 (FIG. 2). Remove the connected purge hose 8 (Fig. 2), and instead use a slightly longer cleaning agent container 1 (about 1 m) as a dedicated tool for easier work.
The tube 12 connected to the No. 1 is connected to the pipe 7 via a silicone rubber adapter 13 and is set, and the cleaning agent is injected / injected into the throttle body 2 through the tube 12. At this time, the injection of the cleaning agent is completed while the engine is running, and the engine is intermittently emptied until white smoke is exhausted, and the cleaning agent remaining inside the engine is burned to finish.

When the engine is cold, it is more preferable to warm up the engine by idling before injecting the cleaning agent. In addition, the method of injecting the cleaning agent for 1 to 2 seconds with the engine stopped first, leaving it for about 2 minutes and then starting the engine and injecting the rest continuously, or the engine speed during injection Even changing it several times is effective for cleaning.

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

In the test, six throttle bodies of an automobile running from about 20,000 km to 42,000 km were prepared, and these were sequentially mounted on an engine of Toyota Camry (1800 cc. Registered in 1993) to perform various cleaning methods. The effect of was investigated. It should be noted that all the six throttle bodies are of a type that comes to the downstream side of the throttle valve 1 when the position of the purge port is slightly opened as shown in FIG. "Toyota genuine engine conditioner EFI vehicle NET 240ml" was used.

Various cleaning methods are as follows. Method of the Present Invention However, a silicon rubber adapter 13 was used as a cleaning tool as shown in FIG. Conventional method 1 The method of 1 in the above-mentioned "prior art". However, the air duct and air cleaner cap were also removed. Conventional method 2 Method 2 of the above-mentioned "Prior art". However, the guide 12a of the tube 12 was used as a cleaning tool as shown in FIG.

In each case, after warming up by idling for 5 to 6 minutes, the engine was stopped and each cleaning method was prepared, but all the tubes were made longer. Next, the engine was started, and while adjusting the accelerator so as not to stop, the entire amount of the cleaning agent was injected, and the cleaning agent was burned by intermittently blowing it until there was no white smoke.

(Comparison of Workability) In the method of the present invention, the purge hose 8 is simply removed from the pipe 7 and replaced with the adapter 13 for the cleaning agent, and no special tool is required. The adapter 13 and the tube 12 can be used repeatedly by taking measures such as tightening them with a hose band so that they will not come off due to the injection pressure.

On the other hand, the conventional method 1 uses the air duct 5
After loosening the screws of the band 5a, removing the metal fittings of the cap of the air cleaner 3 and the intake air temperature sensor 4, and removing the air duct 5 and the air cleaner 3 as a unit, it is appropriate to include the assembly work after cleaning. It will take time and effort.

Also, in the conventional method 2, since the air duct 5 and the air cleaner 3 are integrally removed, the same labor and time as those in the conventional method 1 are required.

(Comparison of Washability) The results are shown in Table 1.

[0023]

As shown in Table 1 above, in the cleaning method according to the present invention, a portion of the inner wall of the throttle body which is slightly removed from the throttle valve on the engine cylinder side compared to the conventional method can be seen. In the previous, it was almost the same as the conventional method.

On the front face of the throttle valve, the conventional method 1 is sufficiently good, but the cleaning method of the present invention is almost successful. On the back surface of the throttle valve, the same or better cleaning effect than the conventional method was shown.

Although the purge port 6 is provided slightly upstream of the closed position of the throttle valve 1 in the above embodiment, the purge port 6 is provided slightly downstream of the throttle valve 1. However, substantially the same effect can be achieved except that the cleaning property of the surface of the throttle valve 1 is slightly inferior.

[0027]

As described above, according to the present invention,
A cleaning agent is injected and injected into the throttle body from a pipe connected to a purge port provided in the throttle body of an automobile engine with an electronically controlled fuel injection device.
By cleaning the intake system of the automobile engine, in terms of workability, it is enough to remove the purge hose from the pipe connected to the purge port and replace it with the cleaning agent tube. As described above, it is necessary to loosen the screw of the band holding the air duct, pull out the air duct, and even remove the air cleaner depending on the model, and after cleaning it, it takes considerable time and effort to reassemble the air duct etc. Compared with the labor-intensive conventional method, it takes less time and labor, so that the working time can be remarkably shortened.

Also, in terms of cleanability, the cleaning method according to the present invention has a cleaning effect equivalent to or better than that of the conventional method.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view of a main part of an apparatus for carrying out a cleaning method according to the present invention.

FIG. 2 is a cross-sectional explanatory view of a main part of a conventional automobile engine intake system.

[Explanation of symbols]

 1 Throttle valve 2 Throttle body 6 Purge port 7 Pipe 11 Cleaning agent container 12 Tube 13 Adapter

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area F02M 25/08 Z 35/10

Claims (1)

[Claims] A cleaning agent is injected into a throttle body from a pipe connected to a purge port provided in a throttle body of an automobile engine with an electronically controlled fuel injection device to inject it, thereby cleaning an intake system of the automobile engine. A method for cleaning an intake system of an automobile engine, characterized by: