Detection device and detection method for quickly diagnosing fuel system fuel tank leakage
阅读说明：本技术 一种快速诊断燃油系统油箱泄漏的检测装置及检测方法 (Detection device and detection method for quickly diagnosing fuel system fuel tank leakage ) 是由 花彬 车晓红 蒋亚明 于 2019-11-21 设计创作，主要内容包括：本发明涉及汽车设备技术领域的一种快速诊断燃油系统油箱泄漏的检测装置及检测方法,每组出气口均独立对应设置有一组充气组件；若干组充气组件均设置在壳体内部,壳体上配合设置有显示器及其操作按钮；充气组件包括充气包、充气管路、控制阀门,充气包括通过充气管路与出气口连接,充气管路上设置有控制阀门,出气口通过检测管路一与汽车燃油系统连接,进气口与氮气罐连接；该发明通过检测装置上内置的压力传感器传导检测压力的变化来判定燃油系统是否存在泄漏并确定燃油排放泄漏是否符合规范,以达到环保要求；同时提供一种检测方法,可以通过燃油泄漏标准值进行比对来判定车辆燃油系统泄漏的位置和泄漏故障的部件,提高了检测效率。(The invention relates to a detection device and a detection method for quickly diagnosing fuel system oil tank leakage in the technical field of automobile equipment, wherein each group of air outlets are independently and correspondingly provided with a group of inflation assemblies; 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 invention judges whether the fuel system has leakage or not by transmitting the change of the detection pressure through the built-in pressure sensor on the detection device and determines whether the fuel discharge leakage meets the standard or not so as to meet the requirement of environmental protection; meanwhile, the detection method can judge the position of the leakage of the vehicle fuel system and the leakage fault component by comparing the standard fuel leakage values, and improves the detection efficiency.)
1. A detection device for quickly diagnosing fuel system fuel tank leakage is characterized by comprising a detection instrument body module, wherein a gas outlet and a gas inlet are formed in the detection instrument body module, a plurality of groups of gas outlets are formed in the gas outlet, and each group of gas outlets is independently and correspondingly provided with a group of inflation assemblies; 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 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 for rapidly diagnosing the fuel tank leakage of the fuel system 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 carbon tank module, a DMTL module, a fuel tank module and a fuel filling pipe module thereof; the DMTL module is connected with the inspection instrument body module through a first pipeline, the DMTL module is connected with the carbon tank module through a second pipeline, the carbon tank module is connected with the CPU valve module through a third pipeline, the CPU valve module is connected with the air inlet manifold module through a sixth pipeline, the air inlet manifold module is connected with the engine module through a seventh pipeline, the carbon tank module is connected with the oil tank module through a fourth pipeline, and the oil tank module is connected with the oil filling pipe module through a fifth pipeline 5.
3. The method for detecting the fuel tank leakage of the national six-fuel system rapidly according to the above claims,
comprises a first stage, a second stage and a third stage; the first stage is a waiting vehicle static stage, the second stage is an inflating and pressurizing part diagnosis stage, and the third stage is a leakage structure calculation stage; the first stage comprises:
the method comprises the following steps: flameout the vehicle, wait for the vehicle to be stationary, and take out the detection instrument body module;
step two: and opening the detection instrument body module, and connecting the air outlet with the DMTL module.
4. The detection method for rapidly diagnosing the fuel tank leakage of the national six fuel system as claimed in claim 3, wherein the second stage comprises:
step one, randomly setting a required pressure value within a preset desired pressure range (0-10 kpa) according to needs, starting a control device, automatically pressurizing an inflation bag, starting to inflate nitrogen, and starting a pressure maintaining function of a detection instrument body module when inflation pressure reaches the set pressure value (for example, 5 kpa);
closing a pipeline III of the CPU valve module, introducing nitrogen from the pipeline I, setting the pressure value in the automobile fuel system to be 2-8kpa, continuously keeping for 3-10min, and judging that no fuel oil leaks from the carbon tank module, the oil tank module and the fuel pipe module if the drop value of the pressure value is less than 1 kpa;
step three, closing a pipeline III of the CPU valve module, introducing nitrogen from the pipeline I, setting the pressure value in the automobile fuel system to be 2-8kpa, continuously keeping for 3-10min, and judging that fuel oil leaks from the DMTL module, the carbon tank module, the oil tank module and the oil filling pipe module if the reduction value of the pressure value is more than 1 kpa;
step four, closing the pipeline III of the CPU valve module, closing the pipeline IV, introducing nitrogen from the pipeline I, setting the pressure value in the automobile fuel system to be 2-8kpa, continuously keeping the pressure value for 3-10min, and judging that the sealing property from the DMTL module to the carbon tank module is good and fuel oil leakage exists in the fuel tank module and the fuel pipe module if the reduction value of the pressure value is less than 1 kpa;
closing a pipeline III of the CPU valve module, closing a pipeline IV, introducing nitrogen from the pipeline I, setting the pressure value in the automobile fuel system to be 2-8kpa, continuously keeping the pressure value for 3-10min, and judging that the possibility of leakage exists from the DMTL module to the carbon tank module if the reduction value of the pressure value is more than 1 kpa;
step six, closing a pipeline three of the CPU valve module, closing a pipeline four, closing a pipeline two, introducing nitrogen from the pipeline one, setting the pressure value in the automobile fuel system to be 2-8kpa, continuously keeping for 3-10min, and judging that the DMTL module has the possibility of leakage if the pressure value is more than 1 kpa;
and step seven, closing the third pipeline of the CPU valve module, closing the fourth pipeline, closing the second pipeline, introducing nitrogen from the first pipeline, setting the pressure value in the automobile fuel system to be 2-8kpa, continuously keeping for 3-10min, and judging that the slave carbon tank module has the possibility of leakage, wherein the pressure value is less than 1 kpa.
5. The detection method for rapidly diagnosing the fuel tank leakage of the national six-fuel system as claimed in claim 3, wherein the detection method comprises the following steps: the third stage comprises: and comparing the condition displayed by the pressure value with the fuel leakage standard value to judge the position of the vehicle fuel system leakage and the component with the leakage fault.
6. The detection method for rapidly diagnosing the fuel tank leakage of the national six-fuel system as claimed in claim 4, wherein the detection method comprises the following steps: the duration of the holding time in the steps one to seven is 5 min.
7. The detection method for rapidly diagnosing the fuel tank leakage of the national six-fuel system as claimed in claim 4, wherein the detection method comprises the following steps: and setting the internal pressure value of the automobile fuel system in the steps from the first step to the seventh step to be 5 kpa.
Technical Field
The invention relates to a detection device for quickly diagnosing fuel system fuel tank leakage and a detection method for detecting by using the device in the technical field of automobile equipment.
Background
With the continuous development of economy and the continuous progress of the automobile industry, automobiles become more and more common in daily work and life of people, and the automobiles are not replaceable in the development of the modern society; with continuous innovation of the technology, the requirements of people on the whole quality and riding experience of the automobile are higher and higher; during the running process of the automobile, the fuel tank and the system can generate some hydrocarbon steam due to high ambient temperature and heat generated by power loss of a fuel pump in the fuel tank; when there is a small leak in the fuel system, the vapors are released to the environment through the leak hole, forming evaporative emissions pollutants, which are a significant environmental hazard and a waste of resources.
The system and the method for diagnosing the leakage of the oil tank by adopting the pressure sensor have the advantages that one mode with the optimal cost in the current existing evaporation system leakage diagnosis scheme is that the application number is CN201811026654.6, the application date is 20180904, the application publication number is CN109281759A and the application publication number is 20190129, and the system and the method comprise a vacuum degree establishing module (1) for closing a carbon tank desorption valve to enable the pressure of the oil tank to be recovered to the atmospheric pressure, then closing a carbon tank ventilation valve and opening the carbon tank desorption valve to establish the target vacuum degree of the oil tank by utilizing the vacuum of an air inlet manifold; the vacuum degree maintaining module (2) is used for restarting the carbon tank desorption valve when the vacuum degree of the oil tank is smaller than a set value, and closing the carbon tank desorption valve until the target vacuum degree is close, so that circulation is performed, and the vacuum degree maintaining module is used for maintaining the target vacuum degree of the oil tank; the waiting module (3) is used for keeping the target vacuum degree to wait that the vehicle speed is lower than a vehicle speed threshold value or the engine enters a start-stop state; the attenuation gradient measuring module (4) is used for closing a carbon tank desorption valve when the current vehicle speed is lower than a threshold value or the engine enters a start-stop state, and an oil tank pressure sensor is used for measuring the vacuum attenuation gradient of the oil tank; the judgment module (5) judges whether the oil tank leaks or not through the oil tank vacuum attenuation gradient; the system is split according to the influence degree of pressure fluctuation noise of the oil tank and the specific requirement on the working condition of the engine in the oil tank leakage diagnosis process, so that the oil tank leakage diagnosis can be carried out on a start-stop function vehicle model under the condition of not interfering the start-stop function; the method for diagnosing the leakage of the oil tank by adopting the pressure sensor evaluates the leakage amount by monitoring the change of the pressure of the oil tank, and can diagnose whether the evaporation system has the leakage of 0.5mm or more than 0.1 mm; however, the system and method also have the disadvantage that the components and location of a particular leak in the fuel system cannot be quickly and accurately determined.
Disclosure of Invention
The invention aims to judge whether the fuel system has leakage or not by transmitting the change of the detection pressure through the pressure sensor arranged in the detection device and determine whether the fuel discharge leakage meets the standard or not so as to meet the requirement of environmental protection.
The purpose of the invention is realized as follows: a detection device for quickly diagnosing fuel system fuel tank leakage is characterized by comprising a detection instrument body module, wherein a gas outlet and a gas inlet are formed in the detection instrument body module, a plurality of groups of gas outlets are formed in the gas outlet, and each group of gas outlets is independently and correspondingly provided with a group of inflation assemblies; 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 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.
The invention has the advantages that the change of the detection pressure is conducted through the pressure sensor arranged in the detection device to judge whether the fuel system has leakage or not and determine whether the fuel discharge leakage meets the standard or not so as to meet the requirement of environmental protection.
As a further improvement of the invention, the system can effectively and quickly detect each part of the automobile fuel system; the automobile fuel system comprises an engine module, an air inlet manifold module, a CPU valve module, a carbon tank module, a DMTL module, an oil tank module and an oil filling pipe module thereof; the DMTL module is connected with the inspection instrument body module through a first pipeline, the DMTL module is connected with the carbon tank module through a second pipeline, the carbon tank module is connected with the CPU valve module through a third pipeline, the CPU valve module is connected with the air inlet manifold module through a sixth pipeline, the air inlet manifold module is connected with the engine module through a seventh pipeline, the carbon tank module is connected with the oil tank module through a fourth pipeline, and the oil tank module is connected with the oil filling pipe module through a fifth pipeline 5.
It is another object of the present invention to provide a detection method for diagnosing fuel tank leakage of a national six fuel system, by which a location of leakage of a vehicle fuel system and a leakage failure component are determined by performing a quick comparison, thereby improving detection efficiency.
Another object of the invention is achieved by: comprises a first stage, a second stage and a third stage; the first stage is a waiting vehicle static stage, the second stage is an inflating and pressurizing part diagnosis stage, and the third stage is a leakage structure calculation stage; the first stage comprises:
the method comprises the following steps: flameout the vehicle, wait for the vehicle to be stationary, and take out the detection instrument body module;
step two: and opening the detection instrument body module, and connecting the air outlet with the DMTL module.
In operation of a further object of the present invention,
as a further improvement of the present invention, to ensure that the leak point and the leak location can be diagnosed quickly; the second stage comprises:
step one, randomly setting a required pressure value within a preset desired pressure range (0-10 kpa) according to needs, starting a control device, automatically pressurizing an inflation bag, starting to inflate nitrogen, and starting a pressure maintaining function of a detection instrument body module when inflation pressure reaches the set pressure value (for example, 5 kpa);
closing a pipeline III of the CPU valve module, introducing nitrogen from the pipeline I, setting the pressure value in the automobile fuel system to be 2-8kpa, continuously keeping for 3-10min, and judging that no fuel oil leaks from the carbon tank module, the oil tank module and the fuel pipe module if the drop value of the pressure value is less than 1 kpa;
step three, closing a pipeline III of the CPU valve module, introducing nitrogen from the pipeline I, setting the pressure value in the automobile fuel system to be 2-8kpa, continuously keeping for 3-10min, and judging that fuel oil leaks from the DMTL module, the carbon tank module, the oil tank module and the oil filling pipe module if the reduction value of the pressure value is more than 1 kpa;
step four, closing the pipeline III of the CPU valve module, closing the pipeline IV, introducing nitrogen from the pipeline I, setting the pressure value in the automobile fuel system to be 2-8kpa, continuously keeping the pressure value for 3-10min, and judging that the sealing property from the DMTL module to the carbon tank module is good and fuel oil leakage exists in the fuel tank module and the fuel pipe module if the reduction value of the pressure value is less than 1 kpa;
closing a pipeline III of the CPU valve module, closing a pipeline IV, introducing nitrogen from the pipeline I, setting the pressure value in the automobile fuel system to be 2-8kpa, continuously keeping the pressure value for 3-10min, and judging that the possibility of leakage exists from the DMTL module to the carbon tank module if the reduction value of the pressure value is more than 1 kpa;
step six, closing a pipeline three of the CPU valve module, closing a pipeline four, closing a pipeline two, introducing nitrogen from the pipeline one, setting the pressure value in the automobile fuel system to be 2-8kpa, continuously keeping for 3-10min, and judging that the DMTL module has the possibility of leakage if the pressure value is more than 1 kpa;
and step seven, closing the third pipeline of the CPU valve module, closing the fourth pipeline, closing the second pipeline, introducing nitrogen from the first pipeline, setting the pressure value in the automobile fuel system to be 2-8kpa, continuously keeping for 3-10min, and judging that the slave carbon tank module has the possibility of leakage, wherein the pressure value is less than 1 kpa.
As a further improvement of the invention, the leakage fault and the leakage point are rapidly judged in order to ensure the third stage; the third stage comprises: and comparing the condition displayed by the pressure value with the fuel leakage standard value to judge the position of the vehicle fuel system leakage and the component with the leakage fault.
As a further improvement of the invention, the detection is carried out in order to ensure the optimal detection time; the duration of the holding time in the steps one to seven is 5 min.
As a further improvement of the invention, the detection is carried out under the optimal detection pressure; and setting the internal pressure value of the automobile fuel system in the steps from the first step to the seventh step to be 5 kpa.
Drawings
Fig. 1 is a front view of a detection apparatus.
FIG. 2 is a block diagram of an automotive fuel system.
Fig. 3 is a front view of the first, second and third stages.
Fig. 4 is a work flow diagram.
Fig. 5 is a schematic view of a connection structure.
The device comprises a detection instrument body module 1, an
Detailed Description
As shown in fig. 1-5, the object of the present invention is achieved by: a detection device for quickly diagnosing fuel system oil tank leakage comprises a detection instrument body module 1, wherein a
The automobile fuel system comprises an engine module, an air inlet manifold module, a CPU valve module, a carbon tank module, a DMTL module, an oil tank module and an oil filling pipe module thereof; the DMTL module is connected with the inspection instrument body module through a
Another object of the invention is achieved by:
comprises a first stage, a second stage and a third stage; the first stage is a waiting vehicle static stage, the second stage is an inflating and pressurizing part diagnosis stage, and the third stage is a leakage structure calculation stage; the first stage comprises:
the method comprises the following steps: flameout the vehicle, wait for the vehicle to be stationary, and take out the detection instrument body module 1;
step two: and opening the detection instrument body module 1, and connecting the
In operation of a further object of the present invention,
comprises a first stage, a second stage and a third stage; the first stage is a waiting vehicle static stage, the second stage is an inflating and pressurizing part diagnosis stage, and the third stage is a leakage structure calculation stage; the first stage comprises:
the method comprises the following steps: flameout the vehicle, wait for the vehicle to be stationary, and take out the detection instrument body module 1;
step two: and opening the detection instrument body module 1, and connecting the
The second stage comprises:
step one, arbitrarily setting a required pressure value within a preset desired pressure range (0-10 kpa) according to requirements, starting a control device, automatically pressurizing an
step two, closing a pipeline III 11 of the CPU valve module, introducing nitrogen from a pipeline I9, setting the pressure value in the automobile fuel system to be 5kpa, continuously keeping for 5min, and judging that no fuel oil leaks from the carbon tank module, the oil tank module and the oil filling pipe module if the reduction value of the pressure value is less than 1 kpa;
step three, closing a pipeline III 11 of the CPU valve module, introducing nitrogen from a pipeline I9, setting the pressure value in the automobile fuel system to be 5kpa, continuously keeping for 5min, and judging that fuel oil leaks from the DMTL module, the carbon tank module, the oil tank module and the oil filling pipe module if the reduction value of the pressure value is more than 1 kpa;
step four, closing a pipeline III 11 of the CPU valve module, closing a pipeline IV 12, introducing nitrogen from a pipeline I9, setting the pressure value in the automobile fuel system to be 5kpa, continuously keeping for 5min, and judging that the sealing performance from the DMTL module to the carbon tank module is good and fuel oil leakage exists in the fuel tank module and the fuel pipe module if the pressure value is less than 1 kpa;
step five, closing a pipeline III 11 of the CPU valve module, closing a pipeline IV 12, introducing nitrogen from a pipeline I9, setting the pressure value in the automobile fuel system to be 5kpa, continuously keeping for 5min, and judging that the possibility of leakage from the DMTL module to the carbon tank module exists, wherein the pressure value is more than 1 kpa;
step six, closing a pipeline III 11 of the CPU valve module, closing a pipeline IV 12, closing a pipeline II 10, introducing nitrogen from a pipeline I9, setting the pressure value in the automobile fuel system to be 5kpa, continuously keeping for 5min, and judging that the DMTL module has the possibility of leakage if the pressure value is more than 1 kpa;
and step seven, closing a pipeline three 11 of the CPU valve module, closing a pipeline four 12, closing a pipeline two 10, introducing nitrogen from a pipeline one 9, setting the pressure value in the automobile fuel system to be 5kpa, continuously keeping for 5min, and judging that the slave carbon tank module has the possibility of leakage, wherein the pressure value is less than 1 kpa.
The third stage comprises: and comparing the condition displayed by the pressure value with the fuel leakage standard value to judge the position of the vehicle fuel system leakage and the component with the leakage fault.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.