CN211038836U - A detection device for rapid diagnosis of fuel tank leakage in China VI fuel system - Google Patents

Abstract

The utility model relates to a detection device for rapidly diagnosing national six fuel system oil tank leakage in the technical field of automobile equipment, wherein each group of gas outlets is independently and correspondingly provided with a group of inflation components; the plurality of groups of inflation assemblies are all arranged inside the shell, and a display and an operation button thereof are arranged on the shell in a matching way; the inflation assembly comprises an inflation bag, an inflation pipeline and a control valve, the inflation bag is connected with an air outlet through the inflation pipeline, the control valve is arranged on the inflation pipeline, the air outlet is connected with an automobile fuel system through a detection pipeline I, and an air inlet is connected with a nitrogen tank; the utility model discloses a whether there is the leakage and confirm that the fuel discharges and leak whether accord with the standard through the change of the last built-in pressure sensor conduction detection pressure of detection device to reach the environmental protection requirement.

Description

A detection device for rapid diagnosis of fuel tank leakage in China VI fuel system

technical field

The utility model relates to a detection device for rapidly diagnosing the leakage of the fuel tank of the National VI fuel system in the technical field of automobile equipment.

Background technique

With the continuous development of the economy and the continuous progress of the automobile industry, automobiles have become more and more common in people's daily work and life, and automobiles play an irreplaceable role in the development of modern society; The requirements for the overall quality of the car and the driving experience are also getting higher and higher; during the driving process of the car, the fuel tank and system will generate some hydrocarbons due to the high ambient temperature and the heat generated by the power loss of the fuel pump in the fuel tank. Compound vapor; when there is a small leak in the fuel system, these vapors are discharged into the environment through the leak hole to form evaporative emission pollutants, which will cause great harm to the environment and a waste of resources.

One of the most cost-effective methods in the current leakage diagnosis scheme of the evaporation system is the application number CN201811026654.6, the application date is 20180904, the application publication number is CN109281759A, and the application publication date is 20190129. A pressure sensor is used to diagnose oil tank leakage. The system and method include a vacuum degree establishment module (1) for closing a carbon canister desorption valve to return the fuel tank pressure to atmospheric pressure, then closing the carbon canister ventilation valve and opening the carbon canister desorption valve to establish a target vacuum of the fuel tank using the intake manifold vacuum The vacuum degree maintaining module (2) is used to reopen the carbon canister desorption valve when the vacuum degree of the fuel tank becomes smaller and less than the set value, and closes the carbon canister desorption valve when it is close to the target vacuum degree. This cycle is used to maintain The target vacuum degree of the fuel tank; the waiting module (3) is used to maintain the target vacuum degree and wait for the vehicle speed to be lower than the vehicle speed threshold or the engine to enter the start-stop state; the decay gradient measurement module (4), when the current vehicle speed is lower than the threshold value or the engine enters the start-stop state The desorption valve of the carbon canister is closed, and the fuel tank pressure sensor measures the vacuum decay gradient of the fuel tank; the judgment module (5) judges whether the fuel tank leaks through the vacuum attenuation gradient of the fuel tank; the system is based on the influence degree of the fuel tank pressure fluctuation noise during the fuel tank leakage diagnosis process and the influence on the engine. The specific requirements of the working conditions are split, so that the fuel tank leakage diagnosis can be carried out on the start-stop function without interfering with the start-stop function; the method of using the pressure sensor to diagnose the fuel tank leakage is specifically by monitoring the change of the fuel tank pressure. Evaluating the amount of leakage can diagnose whether there is a leakage of 0.5mm or more in the evaporation system; however, the system and method also have drawbacks, that is, it is impossible to quickly and accurately determine the specific components and locations of the specific leakage of the fuel system.

Utility model content

The purpose of the utility model is to determine whether there is leakage in the fuel system and to determine whether the leakage of fuel discharge meets the specification by conducting the change of the detection pressure with the built-in pressure sensor on the detection device, so as to meet the environmental protection requirements.

The purpose of the utility model is achieved in this way: a detection device for rapidly diagnosing the leakage of fuel tanks in the National VI fuel system, which is characterized in that it includes a detection instrument body module, and the detection instrument body module is provided with an air outlet and an air inlet, There are several groups of air outlets, and each group of air outlets is independently and correspondingly provided with a group of inflatable components; several groups of inflatable components are arranged inside the casing, and a display and its operation buttons are matched with the casing; the inflatable components include Inflatable bag, inflatable pipeline and control valve, the inflatable component is connected with the air outlet through the inflation pipeline, a control valve is arranged on the inflatable pipeline, the air outlet is connected with the automobile fuel system through the detection pipeline 1, the air intake The port is connected to the nitrogen tank.

The beneficial effect of the utility model is that, the utility model uses the built-in pressure sensor on the detection device to conduct the detection pressure change to determine whether there is leakage in the fuel system and to determine whether the fuel discharge leakage conforms to the specification, so as to meet the environmental protection requirements.

As a further improvement of the present invention, in order to ensure that the automobile fuel system can be easily detected; the automobile fuel system includes an engine module, an intake manifold module, a CPU valve module, a carbon canister module, a DMTL module, a fuel tank module and its filling pipe. module; the DMTL module is connected with the inspection instrument body module through pipeline one, the DMTL module is connected with the carbon canister module through pipeline two, the carbon canister module is connected with the CPU valve module through pipeline three, and the CPU valve module is connected through pipeline three. The module is connected to the intake manifold module through pipeline six, the intake manifold module is connected to the engine module through pipeline seven, the carbon canister module is connected to the fuel tank module through pipeline four, and the fuel tank module is connected to the fuel tank module through pipeline five. Fuel pipe module connection 5.

As a further improvement of the present utility model, in order to ensure that the inspection personnel are easy to control and operate, an air outlet valve is arranged on the first line of the pipeline, and an air inlet valve is also arranged between the air inlet and the nitrogen tank; The outlet valve and the inlet valve are independently controlled.

As a further improvement of the present utility model, in order to ensure easy operation and avoid failure of the equipment due to damage to one air outlet; the air outlets are provided with two groups, and the air outlets are arranged at any position on the body module of the detection instrument.

As a further improvement of the present invention, in order to ensure convenient real-time operation by testing personnel, the display is arranged in the middle of the main body module of the testing instrument, and the operation buttons are arranged on any side of the display.

Description of drawings

FIG. 1 is a front view of the detection device.

Figure 2 is a structural diagram of an automobile fuel system.

FIG. 3 is a front view of the first stage, the second stage and the third stage.

Figure 4 is a work flow chart.

Figure 5 is a schematic diagram of the connection structure.

Among them, 1 detection instrument body module, 2 air outlet, 3 air inlet, 4 inflatable bag, 5 inflatable pipeline, 6 control valve, 7 display, 8 operation button, 9 pipeline one, 10 pipeline two, 11 pipeline Three, 12 pipeline four, 13 pipeline five, 14 pipeline six, 15 pipeline seven.

Detailed ways

As shown in Figures 1-5, the purpose of the present utility model is achieved in this way: a detection device for rapidly diagnosing fuel tank leakage in the National VI fuel system, comprising a detection instrument body module 1, and the detection instrument body module 1 is provided with a Air port 2 and air inlet 3, air outlet 2 is provided with several groups, each group of air outlet 2 is independently and correspondingly provided with a group of inflatable components; several groups of inflatable components are arranged inside the casing, and a display is provided on the casing. 7 and its operation button 8; the inflatable assembly includes an inflatable bag 4, an inflatable pipeline 5, and a control valve 6, the inflatable bag 4 is connected to the air outlet 2 through the inflatable pipeline 5, and the inflatable pipeline 5 is provided with a control valve. Valve 6, the air outlet 2 is connected to the fuel system of the automobile through the detection pipeline 1 9, and the air inlet 3 is connected to the nitrogen tank.

The automobile fuel system includes an engine module, an intake manifold module, a CPU valve module, a carbon canister module, a DMTL module, a fuel tank module and a fuel filler pipe module; the DMTL module is connected with the inspection instrument body module through a pipeline-9, The DMTL module is connected to the carbon canister module through pipeline two 10, the carbon canister module is connected to the CPU valve module through pipeline three 11, and the CPU valve module is connected to the intake manifold module through pipeline six 14, and The air manifold module is connected to the engine module through pipeline seven 15 , the carbon canister module is connected to the fuel tank module through pipeline four 12 , and the fuel tank module is connected to the fuel pipe module 5 through pipeline five 13 .

An air outlet valve is arranged on the first line of the pipeline, and an air inlet valve is also arranged between the air inlet 3 and the nitrogen tank; the air outlet valve and the air inlet valve are independently controlled.

The air outlet 2 is provided with two groups, and the air outlet 2 is arranged at any position on the body module of the detection instrument.

The display 7 is arranged in the middle of the detection instrument body module 1 , and the operation buttons 8 are arranged on any side of the display 7 .

When the utility model works, it includes a first stage, a second stage and a third stage; the first stage is the stage of waiting for the vehicle to stand still, the second stage is the diagnosis stage of the gas-filled pressurized parts, and the third stage is the leakage stage Structural calculation phase; the first phase includes:

Step 1: Turn off the vehicle, wait for the vehicle to stand still, and take out the detection instrument body module 1;

Step 2: Open the main body module 1 of the detection instrument, and connect the air outlet 2 to the DMTL module.

The second stage includes

Step 1: Arbitrarily set the required pressure value within the pre-desired pressure range (0-10kpa) as required, start the control device, automatically pressurize the inflatable bag 4, and begin to charge nitrogen, when the inflation pressure reaches the set pressure value (for example, 5kpa), the main body module 1 of the detection instrument starts the pressure maintaining function;

Step 2, close the CPU valve module pipeline 311, enter nitrogen from pipeline 19, set the pressure value in the automobile fuel system to 5kpa, keep it for 5min, and the drop value of the pressure value is less than 1kpa, that is, it is determined that the carbon canister has There is no fuel leakage in the module, fuel tank module and filler pipe module;

Step 3, close the CPU valve module pipeline 3 11, enter nitrogen from pipeline 1 9, set the pressure value in the automobile fuel system to 5kpa, keep it for 5min, and the drop value of the pressure value is greater than 1kpa, that is, it is determined that the DMTL module is from the DMTL module. , There is fuel leakage in the carbon tank module, fuel tank module and fuel pipe module;

Step 4, close the CPU valve module pipeline three 11, close pipeline four 12, enter nitrogen from pipeline one 9, set the pressure value in the automobile fuel system to 5kpa, keep it for 5min, and the drop value of the pressure value is less than 1kpa, that is, it is judged that the sealing from the DMTL module to the carbon canister module is good, and there is fuel leakage in the fuel tank module and the fuel pipe module;

Step 5, close the CPU valve module pipeline three 11, close pipeline four 12, enter nitrogen from pipeline one 9, set the pressure value in the automobile fuel system to 5kpa, keep it for 5min, and the pressure drop value is greater than 1kpa, that is, it is judged that there is a possibility of leakage from the DMTL module to the carbon canister module;

Step 6, close the CPU valve module pipeline three 11, close pipeline four 12, close pipeline two 10, enter nitrogen from pipeline one 9, set the pressure in the automobile fuel system to 5kpa, and keep it for 5min , the drop value of the pressure value is greater than 1kpa, that is, it is determined that there is a possibility of leakage from the DMTL module;

Step 7, close the CPU valve module pipeline three 11, close pipeline four 12, close pipeline two 10, enter nitrogen from pipeline one 9, set the pressure in the automobile fuel system to 5kpa, and keep it for 5min , the drop value of the pressure value is less than 1kpa, that is, it is determined that there is a possibility of leakage from the carbon canister module.

The third stage includes:

According to the situation displayed by the pressure value and the standard value of fuel leakage, it can determine the location of the leakage of the vehicle's fuel system and the components of the leakage failure.

The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solutions disclosed in the present invention, those skilled in the art can make some technical features according to the disclosed technical content without creative work. Replacement and deformation, these replacements and deformations are within the protection scope of the present invention.

Claims (5)

1. A detection device for rapidly diagnosing the leakage of a national six-fuel system oil tank is characterized by comprising a detection instrument body module, wherein an air outlet and an air inlet are formed in the detection instrument body module, a plurality of groups of air outlets are formed in the air outlet, and a group of inflation assemblies are independently and correspondingly arranged on each group of air outlets; the plurality of groups of inflation assemblies are all arranged inside the shell, and a display and an operation button thereof are arranged on the shell in a matching way; the inflation assembly comprises an inflation bag, an inflation pipeline and a control valve, the inflation assembly is connected with the gas outlet through the inflation pipeline, the control valve is arranged on the inflation pipeline, the gas outlet is connected with an automobile fuel system through a detection pipeline I, and the gas inlet is connected with a nitrogen tank.

2. The device as claimed in claim 1, wherein the fuel system of the automobile comprises an engine module, an intake manifold module, a CPU valve module, a canister module, a DMT L module, a fuel tank module and a fuel filling pipe module, wherein the DMT L module is connected with the inspection instrument body module through a first pipeline, the DMT L module is connected with the canister module through a second pipeline, the canister module is connected with the CPU valve module through a third pipeline, the CPU valve module is connected with the intake manifold module through a sixth pipeline, the intake manifold module is connected with the engine module through a seventh pipeline, the canister module is connected with the fuel tank module through a fourth pipeline, and the fuel tank module is connected with the fuel filling pipe module through a fifth pipeline 5.

3. The detection device for rapidly diagnosing the leakage of the oil tank of the national six-fuel oil system according to claim 1, wherein an air outlet valve is arranged on the first pipeline in a matching manner, and an air inlet valve is arranged between the air inlet and the nitrogen tank in a matching manner; the air outlet valve and the air inlet valve are controlled independently.

4. The detection device for rapidly diagnosing the fuel tank leakage of the national six-fuel system as claimed in claim 1, wherein two groups of air outlets are provided, and the air outlets are arranged at any position on the detection instrument body module.

5. The device for rapidly diagnosing the fuel tank leakage of the national six fuel system as claimed in claim 1, wherein the display is arranged at the middle position of the detection instrument body module, and the operation buttons are arranged at any side of the display.

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