A vacuum control backflow system and backflow method for diesel guo six urea

Abstract

The application discloses a vacuum control back-drawing system and method for diesel national six urea, and the vacuum control back-drawing system for diesel national six urea comprises a vacuum pipe, a liquid storage tank, a backflow pipe and a liquid storage tank liquid inlet pipe, the upper portion of the liquid storage tank is connected with the vacuum pipe through a first electromagnetic valve, the end of the vacuum pipe, which is far away from the liquid storage tank, is connected with a vacuum source, the lower portion of the side of the liquid storage tank is connected with the backflow pipe through a second electromagnetic valve, the end of the backflow pipe, which is far away from the liquid storage tank, is connected with a urea tank, and the front end of the liquid storage tank is connected with a urea pump backflow pipe in communication through the liquid storage tank liquid inlet pipe. The vacuum control back-drawing system for diesel national six urea is safe and mute, can relieve the noise influence brought by the vehicle owner and the surrounding people after the vehicle is stopped, and can improve the whole vehicle emission performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of diesel engines, in particular to a vacuum control back-drawing system and method for diesel Urea VI. BACKGROUND

[0002] After the vehicle is turned off, the Urea solution in the Urea system pipeline needs to be back-drawn to prevent freezing. Otherwise, it will cause pipeline damage and blockage of the Urea nozzle during vehicle operation, resulting in emission failure. The existing technology must be back-drawn after the vehicle is turned off, and the back-drawing time is long, the noise is loud, the back-drawing is not clean, and there is a risk of freezing and blockage causing emission failure. At the same time, the excessive noise of back-drawing causes great complaints from the vehicle owner, causing great inconvenience to the vehicle owner and people around the vehicle.

[0003] The existing Urea back-drawing technology route for diesel VI is as follows: Urea system start-up injection work ( Figure 1 ): When the vehicle OBD monitoring item monitors the emission failure, the vehicle control unit starts the Urea injection work, the control instruction controls the Urea pump work, the Urea solution enters the Urea pump through the Urea pump inlet pipe, and then enters the Urea pump outlet pipe after being pressurized by the Urea pump to complete the pressure building work. The Urea injection nozzle opens or closes according to the control instruction of the control unit to control the injection. Urea back-drawing work ( Figure 2 ) after the vehicle is turned off: After the vehicle is turned off, the Urea control system starts the Urea back-drawing work. At this time, the Urea solution in the Urea pump outlet pipe is drawn back by the Urea pump, flows to the Urea return pipe through the Urea pump, and flows back to the Urea tank to complete the back-drawing work. However, the existing Urea back-drawing time is long, generally 2 minutes after the vehicle is turned off. At the same time, the noise of the Urea pump work is loud, generally 70-80 dB (for two minutes), which will bring certain influence to the people around the vehicle. The vehicle still emits such a loud noise after being turned off, which will cause trouble to the vehicle owner and is considered as a vehicle fault. At the same time, there is a risk of incomplete back-drawing, and there is a hidden danger of freezing affecting vehicle emission. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a vacuum control back-drawing system and method for diesel Urea VI, to solve the noise problem of the existing Urea system back-drawing technology, and to realize silent back-drawing. To solve the noise problem for the vehicle owner and people around the vehicle. At the same time, by using vacuum back-drawing, the back-drawing is more thorough, solving the problem of incomplete back-drawing of the traditional Urea pump, the problem of Urea solution freezing, avoiding the problem of vehicle pipeline freezing and blockage, and the problem of vehicle emission failure caused by failure to spray in time.

[0005] The technical problem to be solved by the present application is solved by the following technical scheme:

[0006] The vacuum control back-drawing system of diesel Guo six urea includes a vacuum pipe, a liquid storage tank, a backflow pipe and a liquid storage tank liquid inlet pipe, the upper side of the liquid storage tank is connected with the vacuum pipe through a first electromagnetic valve, the end of the vacuum pipe away from the liquid storage tank is connected with a vacuum source, the lower side of the liquid storage tank is connected with the backflow pipe through a second electromagnetic valve, the end of the backflow pipe away from the liquid storage tank is connected with a urea tank, and the front end of the liquid storage tank is connected with a urea pump backflow pipe through the liquid storage tank liquid inlet pipe.

[0007] Preferably, the first electromagnetic valve and the second electromagnetic valve are connected with a control system through wired or wireless mode, and a control unit of the control system sends a control instruction to control the opening and closing of the first electromagnetic valve and the second electromagnetic valve.

[0008] Preferably, when the first electromagnetic valve and the second electromagnetic valve are connected with the control system through wired mode, the first electromagnetic valve is connected with the control system through a first electromagnetic valve control line, and the second electromagnetic valve is connected with the control system through a second electromagnetic valve control line.

[0009] Preferably, the first electromagnetic valve is used for controlling the connection and disconnection of the vacuum pipe and the liquid storage tank, and the second electromagnetic valve is used for controlling the connection and disconnection of the backflow pipe and the liquid storage tank.

[0010] Preferably, one end of the liquid storage tank liquid inlet pipe is arranged above the front end of the liquid storage tank, and the other end is connected with the end of the urea pump backflow pipe away from the urea pump.

[0011] Preferably, the vacuum source connected with the vacuum pipe is a vacuum barrel or a vacuum pump.

[0012] Preferably, the liquid storage tank is fixedly arranged above the urea tank.

[0013] A method for back-drawing by using a vacuum control back-drawing system of diesel Guo six urea includes the following steps.

[0014] S1, after the vehicle is turned off and stopped, the urea back-drawing work is started, at this time, the liquid storage tank liquid inlet pipe is in a communication state with the urea pump backflow pipe, the second electromagnetic valve is in a closed state, a control unit of a control system sends a control instruction to open the first electromagnetic valve, and the vehicle vacuum source is directly connected with the liquid storage tank;

[0015] S2, after the first electromagnetic valve is opened, the liquid storage barrel is in a vacuum state, under the action of the vacuum, the urea solution in the urea pump liquid inlet pipe, the urea pump liquid outlet pipe and the urea pump backflow pipe is rapidly back-drawn into the liquid storage tank through the liquid storage tank liquid inlet pipe, the first step of back-drawing work is completed within a pre-set time, and the first electromagnetic valve is closed after the back-drawing is completed.

[0016] S3, open the second electromagnetic valve after the backflow is completed, the second electromagnetic valve is opened, the liquid storage tank and the urea tank are connected through the backflow pipe, under the action of the liquid level differential pressure, the urea solution flows back to the urea tank from the liquid storage tank, the control unit sends a command to close the second electromagnetic valve after the backflow is completed in the preset time, and thus the whole urea backflow work is completed.

[0017] The above technical scheme of the present application has the following beneficial effects:

[0018] The vacuum control backflow system of the diesel sixth national urea has the advantages of safety and silence, eliminating the noise influence on the vehicle owner and the surrounding people after the vehicle stops, and improving the whole vehicle emission performance.

[0019] Specifically, the vacuum closing and opening of the liquid storage tank are controlled by the first electromagnetic valve, and the closing and opening of the urea backflow to the urea tank are controlled by the second electromagnetic valve. The backflow and backflow of urea are controlled through the vacuum system. The backflow time is short, the backflow is thorough, and the work is silent. The problem of 2min continuous urea backflow noise after the traditional urea pump backflow stops is solved, the problem of incomplete backflow of the traditional urea pump backflow is solved, the problem of urea solution freezing is solved, the problem of vehicle pipeline freezing and failure to spray in time is avoided, and the problem of vehicle emission exceeding the standard and other environmental protection problems are avoided. Especially, the silent backflow brings safety to the vehicle owner and the surrounding people, and reduces complaints. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application.

[0021] Figure 1 It is the starting injection work diagram of the prior art urea system.

[0022] Figure 2 It is the urea backflow work diagram after the vehicle stops of the prior art.

[0023] Figure 3 It is the schematic diagram of the vacuum control backflow system of the diesel sixth national urea of the present application connected with the urea tank.

[0024] Figure 4 It is the schematic diagram of the vacuum control backflow system of the diesel sixth national urea of the present application.

[0025] Figure 5 It is the urea backflow flow direction diagram of the vacuum control backflow system of the diesel sixth national urea of the present application.

[0026] Wherein: 1-Urea pump inlet pipe; 2-Urea pump; 3-Urea pump outlet pipe; 4-Nozzle; 5-Urea pump return pipe; 6-Urea tank; 7-Vacuum system; 8-Vacuum tube; 9-Storage tank; 10-Return pipe; 11-Storage tank inlet pipe; 12-First solenoid valve; 13-Second solenoid valve; 14-Second solenoid valve control line; 15-First solenoid valve control line. Detailed Implementation

[0027] Various exemplary embodiments of the present invention will now be described in detail. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0028] like Figures 3-4 As shown, a vacuum control back-drawing system for diesel urea (China VI emission standard) includes: a vacuum tube 8, a storage tank 9, a return pipe 10, and a storage tank inlet pipe 11. The upper part of the storage tank 9 is connected to the vacuum tube 8 via a first solenoid valve 12. The end of the vacuum tube 8 away from the storage tank 9 is connected to a vacuum source. The lower side of the storage tank 9 is connected to the return pipe 10 via a second solenoid valve 13. The end of the return pipe 10 away from the storage tank 9 is connected to a urea tank 6. The front end of the storage tank 9 is connected to the urea pump return pipe 5 via the storage tank inlet pipe 11.

[0029] The first solenoid valve 12 and the second solenoid valve 13 are connected to the control system via wired or wireless means. The control unit of the control system issues control commands to control the opening and closing of the first solenoid valve 12 and the second solenoid valve 13. When the first solenoid valve 12 and the second solenoid valve 13 are connected to the control system via a wired connection, the first solenoid valve 12 is connected to the control system via the first solenoid valve control line 15, and the second solenoid valve 13 is connected to the control system via the second solenoid valve control line 14. The first solenoid valve 12 is used to control the connection and disconnection between the vacuum tube 8 and the liquid storage tank 9; the second solenoid valve 13 is used to control the connection and disconnection between the return pipe 10 and the liquid storage tank 9.

[0030] One end of the liquid inlet pipe 11 of the storage tank is located above the front end of the storage tank 9, and the other end is connected to the end of the urea pump return pipe 5 away from the urea pump 2.

[0031] The vacuum source is a vacuum tank or a vacuum pump. The liquid storage tank 9 is fixedly installed above the urea tank 6.

[0032] like Figure 5 As shown (arrows indicate the direction of urea solution flow), a method for back-pulling using a vacuum-controlled back-pulling system for diesel-powered urea (compliant with China VI emission standards) includes the following steps:

[0033] S1, after the vehicle is turned off and stopped, the urea back-pumping work is started, at this time, the liquid inlet pipe 11 of the liquid tank is in communication with the urea pump liquid return pipe 5, the second electromagnetic valve 13 is in the closed state, the control unit of the control system sends a control instruction to open the first electromagnetic valve 12, and the whole vehicle vacuum source is directly connected with the liquid tank 9;

[0034] S2, after the first electromagnetic valve 12 is opened, the liquid tank 9 is in a vacuum state, under the action of the vacuum, the urea solution in the urea pump liquid inlet pipe 1, the urea pump liquid outlet pipe 3 and the urea pump liquid return pipe 5 is rapidly back-pumped into the liquid tank 9, the first step of back-pumping work is completed within the pre-set time, and after the back-pumping is completed, the first electromagnetic valve 12 is closed;

[0035] S3, after the back-pumping is completed, the second electromagnetic valve 13 is opened, after the second electromagnetic valve 13 is opened, the liquid tank 9 is connected with the urea tank 6 through the backflow pipe 10, under the action of the liquid level differential pressure, the urea solution flows back from the liquid tank 9 to the urea tank 6, and after the backflow is completed within the pre-set time, the control unit sends an instruction to close the second electromagnetic valve 13, and thus the whole urea back-pumping work is completed.

[0036] Although the present application has been disclosed as above, it is not intended to limit the present application, any person skilled in the art can make various selections and modifications without departing from the spirit and scope of the present application, therefore, the protection scope of the present application is defined by the claims and equivalent forms thereof.

Claims

1. A method for carrying out the backflow by a vacuum control backflow system of diesel Euro VI urea, characterized in that, The vacuum control backflow system comprises a vacuum pipe (8), a liquid storage tank (9), a backflow pipe (10) and a liquid storage tank liquid inlet pipe (11), the upper portion of the liquid storage tank (9) is connected with the vacuum pipe (8) through a first electromagnetic valve (12), the end of the vacuum pipe (8) away from the liquid storage tank (9) is connected with a vacuum source, the lower portion of the side of the liquid storage tank (9) is connected with the backflow pipe (10) through a second electromagnetic valve (13), the end of the backflow pipe (10) away from the liquid storage tank (9) is connected with a urea tank (6), the front end of the liquid storage tank (9) is connected with a urea pump liquid return pipe (5) through the liquid storage tank liquid inlet pipe (11); the first electromagnetic valve (12) is used for controlling the connection and disconnection of the vacuum pipe (8) and the liquid storage tank (9); the second electromagnetic valve (13) is used for controlling the connection and disconnection of the backflow pipe (10) and the liquid storage tank (9); one end of the liquid storage tank liquid inlet pipe (11) is arranged above the front end of the liquid storage tank (9), and the other end is connected with the end of the urea pump liquid return pipe (5) away from the urea pump (2); The method comprises the following steps: S1, starting the urea backflow operation after the vehicle is turned off and stopped, at this time, the liquid storage tank liquid inlet pipe (11) and the urea pump liquid return pipe (5) are in a connected state, the second electromagnetic valve (13) is in a closed state, and the control unit of the control system sends a control instruction to open the first electromagnetic valve (12) to directly connect the vehicle vacuum source and the liquid storage tank (9); S2, after the first electromagnetic valve (12) is opened, the liquid storage tank (9) is in a vacuum state, and the urea solution in the urea pump liquid inlet pipe (1), the urea pump liquid outlet pipe (3) and the urea pump liquid return pipe (5) is rapidly backflowed into the liquid storage tank (9) through the liquid storage tank liquid inlet pipe (11) under the action of the vacuum, and the first step of backflow is completed within a preset time, and the first electromagnetic valve (12) is closed after the backflow is completed; S3, after the backflow is completed, the second electromagnetic valve (13) is opened, the liquid storage tank (9) and the urea tank (6) are connected through the backflow pipe (10) after the second electromagnetic valve (13) is opened, and the urea solution is backflowed from the liquid storage tank (9) to the urea tank (6) under the action of the liquid level differential pressure, and the control unit sends an instruction to close the second electromagnetic valve (13) after the backflow is completed within a preset time, and thus the entire urea backflow operation is completed.

2. The method of claim 1, wherein, The first electromagnetic valve (12) and the second electromagnetic valve (13) are connected with the control system in a wired or wireless manner, and the control unit of the control system sends a control instruction to control the opening and closing of the first electromagnetic valve (12) and the second electromagnetic valve (13).

3. The method of claim 2, wherein, When the first electromagnetic valve (12) and the second electromagnetic valve (13) are connected with the control system in a wired manner, the first electromagnetic valve (12) is connected with the control system through a first electromagnetic valve control line (15), and the second electromagnetic valve (13) is connected with the control system through a second electromagnetic valve control line (14).

4. The method of claim 1, wherein, The vacuum source connected with the vacuum pipe (8) is a vacuum barrel or a vacuum pump.

5. The method of claim 1, wherein, The liquid storage tank (9) is fixedly arranged above the urea tank (6).

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