A convertible carbon deposit cleaning device and method for automobile engine

Abstract

The present invention discloses a convertible carbon deposit cleaning device and method for automobile engines, including an intake duct and intake valve carbon deposit cleaning system and a fuel injector and in-cylinder carbon deposit cleaning system, wherein the above two systems are simultaneously connected to the automobile engine, wherein: the first inlet of the three-way joint is provided with a first switch valve, and the second inlet is provided with a second switch valve, and when the first cleaning agent tank is connected to the engine vacuum pipeline, the first inlet and the second inlet of the three-way joint are alternately connected to the output port of the three-way joint via the first switch valve and the second switch valve, so as to provide fuels of different calorific values ​​for the running engine. The present invention covers the cleaning time of the intake duct and intake valve with the cleaning time of the fuel injector and in-cylinder carbon deposit, shortens the total cleaning time, reduces the labor intensity, avoids the problem that the engine is not easy to start when the fuel injector and in-cylinder carbon deposit cleaning is switched from the intake duct and intake valve carbon deposit cleaning in the traditional cleaning, and greatly improves the cleaning efficiency.

Description

Technical Field

[0001] The invention relates to a convertible carbon deposit cleaning device and method for an automobile engine. Background Art

[0002] Whether it is a manifold injection engine or a fuel direct injection engine (GDI engine), due to factors such as fuel quality and road traffic, carbon deposits are generated in the intake duct, intake valve, fuel injector and cylinder. The engine needs to regularly clean the carbon deposits and sediments in these parts to restore engine performance, save fuel consumption, increase power and reduce emissions. However, two different cleaning agents and cleaning structure systems are used for cleaning carbon deposits in the intake duct, intake valve and fuel injector and cylinder:

[0003] The cleaning of carbon deposits in the intake duct and intake valve is to connect the cleaning agent to the engine intake manifold. The engine uses vacuum suction to suck the cleaning agent into the intake duct and intake valve parts to clean the carbon deposits. The cleaning time is generally 30-40 minutes.

[0004] The cleaning of fuel injectors and carbon deposits in cylinders is done by connecting a pressurized cleaning agent to the engine fuel supply line, using the calorific value of the cleaning agent instead of fuel to maintain engine operation to clean the fuel injectors and carbon deposits in the cylinder. The cleaning time is generally 15-25 minutes.

[0005] The current practice is to first connect the fuel injector and cylinder carbon deposit cleaning system, unplug the fuel tank fuel pump fuse to stop the fuel supply, and after the fuel injector and cylinder carbon deposit cleaning is completed, remove the fuel injector and cylinder carbon deposit cleaning system, then insert the fuel tank fuel pump fuse to resume fuel supply, and connect the intake duct and intake valve carbon deposit cleaning system to clean the intake duct and intake valve carbon deposits.

[0006] Since the two systems are operated independently of each other, it is time-consuming and labor-intensive. In addition, when cleaning the intake duct and intake valve, it is necessary to remove the injector and the in-cylinder carbon deposit cleaning system and restore the engine fuel supply pipe. After reconnecting the fuel supply pipe, it takes time for the engine fuel supply pipe to establish a stable fuel supply. At this time, when the engine is started, the addition of intake duct and intake valve cleaning agent increases the concentration of the fuel mixture, making it difficult to start the engine. The overly concentrated fuel mixture floods the spark plug, and the engine cannot be started normally, and the intake duct and intake valve cleaning cannot be carried out normally. Summary of the invention

[0007] The purpose of the present invention is to provide a convertible carbon deposit cleaning device and method for automobile engines, which connects the fuel injector and in-cylinder carbon deposit cleaning system and the fuel injector and in-cylinder carbon deposit cleaning system at the same time, and uses a two-position three-way control valve to control the connection of the two systems to achieve seamless connection and conversion cleaning of the two systems, thereby greatly improving the cleaning efficiency.

[0008] In order to achieve the above-mentioned purpose, the technical solution of the present invention is: a fuel injector and in-cylinder carbon deposit cleaning system, a second cleaning agent tank used for fuel injector and in-cylinder carbon deposit cleaning is connected to the first inlet of a three-way joint, the second inlet of the three-way joint is connected to the engine fuel pump output supply pipeline, the output port of the three-way joint is connected to the oil circuit interface in front of the engine fuel injector, the cleaning agent in the second cleaning agent tank is pressurized and can be directly used for engine operation, wherein the first inlet of the three-way joint is provided with a first switch valve, and the second inlet is provided with a second switch valve, the first inlet and the second inlet of the three-way joint are alternately or jointly connected to the output port of the three-way joint via the first switch valve and the second switch valve, so as to provide fuels with different calorific values ​​for the running engine.

[0009] A further solution is that the three-way connector with the first switch valve and the second switch valve is a two-position three-way valve, and the two-position three-way valve enables the first inlet and the second inlet of the three-way connector to be alternately connected to the output port of the three-way connector.

[0010] A convertible carbon deposit cleaning device for an automobile engine comprises an intake duct and an intake valve carbon deposit cleaning system and an injector and an in-cylinder carbon deposit cleaning system. The intake duct and the intake valve carbon deposit cleaning system connects a first cleaning agent tank for cleaning the intake duct and the intake valve carbon deposits to an engine vacuum pipeline. The injector and in-cylinder carbon deposit cleaning system connects a second cleaning agent tank for cleaning the injector and the in-cylinder carbon deposits to a first inlet of a three-way joint. The second inlet of the three-way joint is connected to an output supply pipeline of an engine fuel pump. The output port of the three-way joint is connected to an oil circuit interface in front of the engine injector. The cleaning agent in the second cleaning agent tank is pressurized and can be directly used for engine operation. The two systems are simultaneously connected to the automobile engine. The first inlet of the three-way joint in the injector and in-cylinder carbon deposit cleaning system is provided with a first switch valve, and the second inlet is provided with a second switch valve. When the first cleaning agent tank is connected to the engine vacuum pipeline, the first inlet and the second inlet of the three-way joint are alternately connected to the output port of the three-way joint via the first switch valve and the second switch valve, so as to provide fuels with different calorific values ​​for the running engine.

[0011] A further solution is that the first switch valve and the second switch valve are manual switch valves or electromagnetic switch valves, and a timing programmable controller is connected to the electromagnetic switch valves.

[0012] A further solution is: the three-way connector with the first switch valve and the second switch valve is a two-position three-way valve or a two-position three-way solenoid valve, and a timing programmable controller is connected to the two-position three-way solenoid valve.

[0013] A method for cleaning carbon deposits in an automobile engine based on the convertible carbon deposit cleaning device, wherein the preset cleaning time of carbon deposits in the intake duct and the intake valve is longer than the preset cleaning time of carbon deposits in the fuel injector and the cylinder, wherein the cleaning of the fuel injector and the carbon deposits in the cylinder is completed during the cleaning of carbon deposits in the intake duct and the intake valve, and the process is:

[0014] Step 1: Connect the fuel pump output supply pipeline or the second cleaning agent tank for cleaning the fuel injector and carbon deposits in the cylinder to the oil circuit interface in front of the engine fuel injector;

[0015] Step 2: Start the engine and keep it running;

[0016] Step 3: Adjust the flow rate of the cleaning agent in the first cleaning agent tank to clean the carbon deposits on the engine intake duct and intake valve;

[0017] Step 4: Determine whether the fuel pump output supply pipeline is connected to the oil circuit interface in front of the engine fuel injector. If yes, switch it to connect the second cleaning agent tank for cleaning the fuel injector and carbon deposits in the cylinder to the oil circuit interface in front of the engine fuel injector, so that the engine fuel injector and carbon deposits in the cylinder can be cleaned while cleaning the carbon deposits in the engine intake duct and intake valve;

[0018] Step 5: When the preset time for cleaning the carbon deposits in the fuel injector and cylinder is reached, disconnect the second cleaning agent tank from the oil circuit interface in front of the engine fuel injector. At the same time, connect the fuel pump output supply pipeline to the oil circuit interface in front of the engine fuel injector. The engine continues to run to clean the carbon deposits in the engine intake duct and intake valve until the cleaning time for carbon deposits in the engine intake duct and intake valve is reached, and the cleaning is completed.

[0019] The scheme is further as follows: the first switch valve and the second switch valve in the convertible carbon deposit cleaning device are manual switch valves or electromagnetic switch valves, and a timing programmable controller is connected to the electromagnetic switch valve. The timing programmable controller connects the fuel pump output supply pipeline with the oil circuit interface in front of the engine fuel injector according to the preset duration of carbon deposit cleaning in the fuel injector and cylinder, and ends the carbon deposit cleaning of the intake duct and intake valve according to the preset duration of cleaning.

[0020] The scheme is further as follows: the three-way joint with the first switch valve and the second switch valve in the convertible carbon deposit cleaning device is a two-position three-way valve or a two-position three-way solenoid valve, a timing programmable controller is connected to the two-position three-way solenoid valve, the timing programmable controller connects the fuel pump output supply pipeline with the oil circuit interface in front of the engine fuel injector according to the preset duration of cleaning of the fuel injector and the carbon deposits in the cylinder, and the timing programmable controller cleans the carbon deposits in the intake duct and the intake valve for the preset duration and ends the cleaning.

[0021] A further solution is that the preset time duration is a time duration threshold value set in the timing programmable controller, or a time duration signal sent by setting a liquid level sensor in the first cleaning agent tank and the second cleaning agent tank.

[0022] The scheme is further as follows: in the first step, the fuel pump output supply pipeline is first connected to the oil circuit interface in front of the engine fuel injector, and the order of the third step and the fourth step is irrelevant.

[0023] The beneficial effects of the present invention are as follows: the overlapping access of the two systems is controlled by valves, so that seamless connection and conversion cleaning of the two systems are realized; wherein, the cleaning time of the intake duct and the intake valve covers the cleaning time of the fuel injector and the carbon deposits in the cylinder, thus shortening the total cleaning time, reducing the labor intensity, and avoiding the problem of the engine being difficult to start when the fuel injector and the carbon deposits in the cylinder are converted to the intake duct and the carbon deposits in the intake valve in the traditional cleaning, thereby greatly improving the cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of this embodiment, it should be noted that the terms "connect" and "placed" should be understood in a broad sense. For example, "connect" can be a wire connection or a mechanical connection; "placed" can be a fixed connection placement or an integral placement. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0027] A convertible carbon deposit cleaning device for an automobile engine, such as Figure 1As shown, the device includes an intake duct and intake valve carbon deposit cleaning system 1 and a fuel injector and cylinder carbon deposit cleaning system 2. The intake duct and intake valve carbon deposit cleaning system connects a first cleaning agent tank 101 used for cleaning the intake duct and intake valve carbon deposits to a vacuum pipe 4 of an engine 3. When the engine is running, the cleaning agent in the first cleaning agent tank 101 is sucked into the engine intake duct through the negative pressure of the vacuum pipe 4 to clean the intake duct and intake valve carbon deposits. The vacuum pipe 4 is a vacuum pipe connected to the intake valve of the automobile engine and arranged in the pipeline between the throttle 5 and the engine intake manifold 6. Usually, a vacuum pipe interface is arranged at this point in the automobile and is connected to a pipeline. In this embodiment, a tee 7 is added at this interface. While ensuring that the original pipeline is unobstructed, the cleaning agent pipeline of the first cleaning agent tank is connected through the arranged tee 7. The fuel injector and in-cylinder carbon deposit cleaning system connects a second cleaning agent tank 201 used for fuel injector and in-cylinder carbon deposit cleaning to a first inlet a of a three-way joint 202, and a second inlet b of the three-way joint 202 is connected to an output supply pipeline of a fuel pump 801 of an engine fuel tank 8, and an output port c of the three-way joint is connected to an oil circuit interface 301 in front of the engine fuel injector. The cleaning agent in the second cleaning agent tank is pressurized and can be directly used for engine operation. The difference between this embodiment and the traditional method is that the intake duct and intake valve carbon deposit cleaning system 1 and the fuel injector and in-cylinder carbon deposit cleaning system 2 are simultaneously connected to the automobile engine, wherein: the fuel injector and in-cylinder carbon deposit cleaning system can be used separately, and the first inlet of the three-way joint 202 is provided with a first switch valve, and the second inlet is provided with a second switch valve, and the first inlet and the second inlet of the three-way joint are connected to the output port of the three-way joint via the first switch valve and the second switch valve alternately or jointly, so as to provide different calorific value fuels for the running engine. The three-way joint with the first switch valve and the second switch valve can be replaced by a two-position three-way valve. The two-position three-way valve is used to connect the first inlet and the second inlet of the three-way joint to the output port of the three-way joint in a seamless and alternating manner.

[0028] When the two systems of this embodiment are connected to the automobile engine at the same time, in order to cover the fuel injector and the carbon deposit cleaning in the cylinder for the carbon deposit cleaning of the intake duct and the intake valve, the first cleaning agent tank for the carbon deposit cleaning of the intake duct and the intake valve is connected to the engine vacuum pipe for cleaning work, the first inlet and the second inlet of the three-way joint are alternately connected to the output port of the three-way joint via the first switch valve and the second switch valve, so as to provide fuels with different calorific values ​​for the running engine.

[0029] The first switch valve and the second switch valve are manual switch valves or electromagnetic switch valves. If the electromagnetic switch valves are selected, a timing programmable controller is connected to the electromagnetic switch valves.

[0030] A preferred solution is that the three-way connector with the first switch valve and the second switch valve is a two-position three-way valve or a two-position three-way solenoid valve. When a two-position three-way solenoid valve is selected, a timing programmable controller is connected to the two-position three-way solenoid valve to achieve automatic control.

[0031] The above-mentioned timing programmable controller can be a PLC programmable controller, or a control circuit composed of a microprocessor and its peripheral circuits, which is used to control the switching sequence of the electromagnetic switch valve according to different electromagnetic switch valve working time thresholds preset in the memory, or control the switching sequence of the electromagnetic switch valve according to the signals emitted by the first cleaning agent tank and the second cleaning agent tank liquid level sensors, or emit display and sound signals of different working states according to the working time threshold or the liquid level sensor signal.

[0032] In order to realize dynamic switching cleaning when the engine is running: the output supply pipeline of the engine fuel pump has a pressure return channel 802. The current engine fuel supply circuit has a pressure return channel 802. If some old engines do not have it, this circuit needs to be added. When the engine is started and running, the alternate connection between the injector, the second cleaning agent tank for carbon deposit cleaning in the cylinder, and the output supply pipeline of the engine fuel pump and the oil circuit interface is seamlessly alternated. That is to say, if the two-position three-way valve is composed of two switches, the first switch valve and the second switch valve, the alternate switch controlling the two switches must be synchronous and seamlessly alternated.

[0033] In the embodiment: Figure 1 As shown, a vacuum pressure sensor 102 and an electromagnetic flow controller 103 are sequentially connected to the pipeline connecting the first cleaning agent tank 101 and the engine vacuum pipeline, and the vacuum pressure sensor 102 and the electromagnetic flow controller 103 are connected via a three-way connector 104. A control circuit 105 is provided with a vacuum pressure measurement interface 105-1 and an electromagnetic flow control interface 105-2. The electrical output signal of the vacuum pressure sensor is connected to the vacuum pressure measurement interface, and the electromagnetic flow control interface is connected to the electrical signal control input end of the electromagnetic flow controller. The control circuit 105 controls the electromagnetic flow controller 103 through the measured vacuum pressure output pulse signal to adjust the output amount of the cleaning agent.

[0034] The second cleaning agent tank is a pressurized cleaning agent tank, and the pressure is formed by inflating and pressurizing the second cleaning agent tank with a pressure gas source 203. A pressure regulating valve 204 is provided in the pipeline from the pressure gas source 203 to the second cleaning agent tank, and the pressure regulating valve 204 is used to stabilize the cleaning agent output pressure of the second cleaning agent tank.

[0035] During the cleaning process, the duration of the carbon deposit cleaning of the intake duct and the intake valve is longer than that of the carbon deposit cleaning of the fuel injector and the cylinder. The duration of the carbon deposit cleaning of the intake duct and the intake valve is generally 30-40 minutes, and 30-40 minutes is usually enough to use up a can of carbon deposit cleaning agent for the intake duct and the intake valve; the duration of the carbon deposit cleaning of the fuel injector and the cylinder is generally 15-25 minutes, and 15-25 minutes is usually enough to use up a can of carbon deposit cleaning agent for the fuel injector and the cylinder. Under the above structure, a two-position three-valve can be used to control the overlapping access of the two systems, so as to realize the seamless connection and conversion cleaning of the two systems.

[0036] To this end, a method for cleaning carbon deposits in an automobile engine based on the convertible carbon deposit cleaning device is provided, wherein the output supply pipeline of the engine fuel pump has a pressure reflux channel, and the preset time length for cleaning carbon deposits in the intake duct and the intake valve is longer than the preset time length for cleaning carbon deposits in the fuel injector and the cylinder, wherein the cleaning of the fuel injector and the carbon deposits in the cylinder is completed during the cleaning of carbon deposits in the intake duct and the intake valve, and the cleaning process is:

[0037] Step 1: Connect the fuel pump output supply pipeline or the second cleaning agent tank for cleaning the fuel injector and carbon deposits in the cylinder to the oil circuit interface in front of the engine fuel injector;

[0038] Step 2: Start the engine and keep it running;

[0039] Step 3: Adjust the flow rate of the cleaning agent in the first cleaning agent tank to clean the carbon deposits on the engine intake duct and intake valve;

[0040] Step 4: Determine whether the fuel pump output supply pipeline is connected to the oil circuit interface in front of the engine fuel injector. If yes, switch it to connect the second cleaning agent tank for cleaning the fuel injector and carbon deposits in the cylinder to the oil circuit interface in front of the engine fuel injector, so that the engine fuel injector and carbon deposits in the cylinder can be cleaned while cleaning the carbon deposits in the engine intake duct and intake valve;

[0041] Step 5: When the preset time for cleaning the carbon deposits in the fuel injector and cylinder is reached, disconnect the second cleaning agent tank from the oil circuit interface in front of the engine fuel injector. At the same time, connect the fuel pump output supply pipeline to the oil circuit interface in front of the engine fuel injector. The engine continues to run to clean the carbon deposits in the engine intake duct and intake valve until the cleaning time for carbon deposits in the engine intake duct and intake valve is reached, and the cleaning is completed.

[0042] Among them: the first switch valve and the second switch valve in the convertible carbon deposit cleaning device are manual switch valves or electromagnetic switch valves, and a timing programmable controller is connected to the electromagnetic switch valve. The timing programmable controller connects the fuel pump output supply pipeline with the oil circuit interface in front of the engine fuel injector according to the preset duration of carbon deposit cleaning in the fuel injector and cylinder, and ends the carbon deposit cleaning of the intake duct and intake valve according to the preset duration of cleaning.

[0043] Another preferred solution: the three-way joint with the first switch valve and the second switch valve in the convertible carbon deposit cleaning device is a two-position three-way valve or a two-position three-way solenoid valve, and a timing programmable controller is connected to the two-position three-way solenoid valve. The timing programmable controller connects the fuel pump output supply pipeline with the oil circuit interface in front of the engine fuel injector according to the preset duration of cleaning of the fuel injector and carbon deposits in the cylinder, and the timing programmable controller cleans the carbon deposits in the intake duct and intake valve for a preset duration and ends the cleaning.

[0044] The preset duration is a duration threshold value set in the timing programmable controller, or may be a duration signal sent by a cleaning end liquid level set by a liquid level sensor in the first cleaning agent tank and the second cleaning agent tank.

[0045] In order to start smoothly, in the first step, first connect the fuel pump output supply pipeline to the oil circuit interface in front of the engine injector. The third and fourth steps are in no particular order.

[0046] The above-mentioned embodiment connects the two systems in an overlapping manner to realize seamless connection and conversion cleaning of the two systems; among them, the cleaning time of the intake duct and the intake valve covers the cleaning time of the fuel injector and the carbon deposits in the cylinder, thus shortening the total cleaning time, reducing the labor intensity, and avoiding the problem of the engine being difficult to start when the fuel injector and the carbon deposits in the cylinder are converted to the intake duct and the carbon deposits in the intake valve in the traditional cleaning, thereby greatly improving the cleaning efficiency.

Claims

1. A convertible carbon deposit cleaning device for automobile engines, comprising an intake duct and an intake valve carbon deposit cleaning system and a fuel injector and a cylinder carbon deposit cleaning system, wherein the intake duct and the intake valve carbon deposit cleaning system connects a first cleaning agent tank for the intake duct and the intake valve carbon deposit cleaning to an engine vacuum pipe, and the fuel injector and the cylinder carbon deposit cleaning system connects a second cleaning agent tank for the fuel injector and the cylinder carbon deposit cleaning to a first inlet of a three-way joint, the second inlet of the three-way joint is connected to an output supply pipeline of an engine fuel pump, the output port of the three-way joint is connected to an oil circuit interface in front of the engine fuel injector, and the cleaning agent in the second cleaning agent tank is pressurized and can be directly used for engine operation, It is characterized in that The above two systems are connected to the automobile engine at the same time, wherein: the first inlet of the three-way joint in the fuel injector and in-cylinder carbon deposit cleaning system is provided with a first switch valve, and the second inlet is provided with a second switch valve. When the first cleaning agent tank is connected to the engine vacuum pipeline, the first inlet and the second inlet of the three-way joint are alternately connected to the output port of the three-way joint via the first switch valve and the second switch valve, so as to provide fuels with different calorific values ​​for the running engine; the second cleaning agent tank for the fuel injector and in-cylinder carbon deposit cleaning and the output supply pipeline of the engine fuel pump are alternately connected with the oil circuit interface by controlling the seamless alternating connection of the two switch valves; During the cleaning process, the cleaning time of the intake duct and intake valve carbon deposits is longer than that of the fuel injector and the carbon deposits in the cylinder. The switch valve is used to control the overlapping access of the two systems to achieve seamless connection and conversion cleaning of the two systems.

2. The switchable carbon deposit cleaning device according to claim 1, It is characterized in that The first switch valve and the second switch valve are manual switch valves or electromagnetic switch valves, and a timing programmable controller is connected to the electromagnetic switch valves.

3. The switchable carbon deposit cleaning device according to claim 1, It is characterized in that The three-way connector with the first switch valve and the second switch valve is a two-position three-way solenoid valve, and a timing programmable controller is connected to the two-position three-way solenoid valve.

4. A method for cleaning carbon deposits of an automobile engine with a convertible carbon deposit cleaning device according to claim 1, wherein the preset cleaning time of carbon deposits of the intake duct and the intake valve is longer than the preset cleaning time of the fuel injector and the carbon deposits in the cylinder, It is characterized in that In the process of cleaning the carbon deposits in the intake duct and intake valve, the fuel injector and the carbon deposits in the cylinder are cleaned. The process is as follows: Step 1: Connect the fuel pump output supply pipeline or the second cleaning agent tank for cleaning the fuel injector and carbon deposits in the cylinder to the oil circuit interface in front of the engine fuel injector; Step 2: Start the engine and keep it running; Step 3: Adjust the flow rate of the cleaning agent in the first cleaning agent tank to clean the carbon deposits on the engine intake duct and intake valve; Step 4: Determine whether the fuel pump output supply pipeline is connected to the oil circuit interface in front of the engine fuel injector. If yes, switch it to connect the second cleaning agent tank for cleaning the fuel injector and carbon deposits in the cylinder to the oil circuit interface in front of the engine fuel injector, so that the engine fuel injector and carbon deposits in the cylinder can be cleaned while cleaning the carbon deposits in the engine intake duct and intake valve; Step 5: When the preset time for cleaning the carbon deposits in the fuel injector and cylinder is reached, disconnect the second cleaning agent tank from the oil circuit interface in front of the engine fuel injector. At the same time, connect the fuel pump output supply pipeline to the oil circuit interface in front of the engine fuel injector. The engine continues to run to clean the carbon deposits in the engine intake duct and intake valve until the cleaning time for carbon deposits in the engine intake duct and intake valve is reached, and the cleaning is completed.

5. The method according to claim 4, It is characterized in that The first switch valve and the second switch valve in the convertible carbon deposit cleaning device are electromagnetic switch valves, and a timing programmable controller is connected to the electromagnetic switch valve. The timing programmable controller connects the fuel pump output supply pipeline with the oil circuit interface in front of the engine fuel injector according to the preset duration of carbon deposit cleaning in the fuel injector and cylinder, and ends the carbon deposit cleaning of the intake duct and intake valve according to the preset duration of cleaning.

6. The method according to claim 4, It is characterized in that The three-way joint with the first switch valve and the second switch valve in the convertible carbon deposit cleaning device is a two-position three-way solenoid valve. A timing programmable controller is connected to the two-position three-way solenoid valve. The timing programmable controller connects the fuel pump output supply pipeline with the oil circuit interface in front of the engine fuel injector according to the preset duration of cleaning of the fuel injector and carbon deposits in the cylinder. The timing programmable controller cleans the carbon deposits in the intake duct and intake valve for a preset duration and ends the cleaning.

7. The method according to claim 5 or 6, It is characterized in that The preset time duration is a time duration threshold value set in the timing programmable controller, or a time duration signal sent by a liquid level sensor set in the first cleaning agent tank and the second cleaning agent tank.

8. The method according to claim 4, It is characterized in that In the first step, the fuel pump output supply pipeline is first connected to the oil circuit interface in front of the engine fuel injector, and the third step and the fourth step are performed in the same order.

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