CN103698119B - Test method of circulation air pipe of air exhaust system of fuel tank - Google Patents
Test method of circulation air pipe of air exhaust system of fuel tank Download PDFInfo
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- CN103698119B CN103698119B CN201310699993.1A CN201310699993A CN103698119B CN 103698119 B CN103698119 B CN 103698119B CN 201310699993 A CN201310699993 A CN 201310699993A CN 103698119 B CN103698119 B CN 103698119B
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Abstract
The present invention relates to a kind of test method of circulation air pipe of air exhaust system of fuel tank, the probe of smoke chest is installed at the oil filler of filling spout, read specified volume read-out V and specified inspiratory capacity V1, the rated voltage drop value Δ P of level control valve of nozzle, during oiling, read the oil vapour pressure value P in fuel tank
0, observe the flow direction of cigarette simultaneously; As cigarette is blown, circulating gas pipe is judged as defective.Circulating gas pipe to be measured and filling spout are connected, gas source pipe is connected in the porch of circulating gas pipe, the entrance of gas source pipe is connected with stable source of the gas by gas source valve, is provided with flowmeter in the middle part of gas source pipe, and exit is provided with give vent to anger valve and pipeline pressure table; To give vent to anger valve wide open, then to regulate the aperture of gas source valve to make the reading P of pipeline pressure table
1=P
0-Δ P, the reading Q value of reading flow gauge; If Q & is gt; V1, circulating gas pipe is judged as defective, otherwise is qualified.This method of testing is reliably easy, saves cost.
Description
Technical field
The present invention relates to a kind of method of testing of fuel tank, particularly a kind of test method of circulation air pipe of air exhaust system of fuel tank.
Background technology
Along with the continuous increase of domestic automobile output, automobile has become the important sources of urban air pollution, and gasoline volatilization exhaust of oil thing is out again the pollution source that automobile primary is wanted.In order to improve atmosphere quality, various countries have formulated more and more stricter automobile emission regulation, have also formulated strict vehicle fuel oil evaporation Abgasgesetz simultaneously.Therefore, to the control of Pollutant of Evaporated Gasoline Vehicle be Automobile emission control importance.Vehicle-mounted fuel vapor retracting device (being called for short ORVR exhaust system) is the gordian technique controlling fuel evaporation pollutant discharge.
The sidewall of fuel tank is provided with oil-in, and oil-in is connected with the lower end of filling spout, and the upper end of filling spout is higher than fuel tank and be provided with the oil filler of socket joint nozzle.Fuel tank head is provided with pressure control valve and level control valve, and the outlet of level control valve is connected with the air intake opening of canister after being connected with the outlet of pressure control valve again, and the outlet of level control valve is also connected with the oil filler sidewall of filling spout by circulating gas pipe.
When automobile is in running order, level control valve is normally closed, and when the oil vapour pressure in fuel tank reaches certain numerical value, pressure control valve is opened, and oil vapour enters canister and adsorbed.When automobile is in fueling state, pressure control valve cuts out, and level control valve is opened, oil vapour flows out from the outlet of level control valve, a part enters canister and is adsorbed, and another part gets back to the oral area of filling spout by circulating gas pipe, comes back in fuel tank with the air-flow refueled; When fuel tank reaches jumping gun oil position, level control valve is closed.
The position that nozzle inserts tank filler tube is oil fuel tube, oil fuel tube lower port is oil-out, oil fuel tube lumen centers is also provided with air intake duct, and the lower port of air intake duct is connected with the pore of oil fuel tube lower end sidewall, and the upper end of air intake duct is stretched out oil fuel tube and communicated with air.When the oil fuel tube of nozzle is to tank filling, under the swabbing action of fuel jet, air intake duct synchronously can inject air to fuel tank.For nozzle, its volume read-out V under declared working condition and inspiratory capacity V1 is given value.
The air capacity of circulating gas pipe is by the volume of the discharge and canister that affect filling spout oral area hydrocarbon substance, and the air capacity of circulating gas pipe is determined by the flow of pipeline, pressure drop.Resistance as circulating gas pipe is excessive, then the overload of canister; Resistance as circulating gas pipe is too small, then easily have oil vapour to overflow from oil filler.In the design of existing ORVR system, just develop the hydrocarbon emission of rear detection fuel system, also do not have a kind of method that well may be used for direct-detection circulating gas pipe exhaust performance.
Summary of the invention
The object of the invention is to, overcome problems of the prior art, a kind of test method of circulation air pipe of air exhaust system of fuel tank is provided, when accurately can judge that fuel tank refuels, whether have oil vapour to overflow.
For solving above technical matters, test method of circulation air pipe of air exhaust system of fuel tank of the present invention, the sidewall of fuel tank is provided with oil-in, oil-in is connected with the lower end of filling spout, the upper end of filling spout is higher than fuel tank and be provided with the oil filler of socket joint nozzle, the top of fuel tank is provided with level control valve, the outlet of described level control valve is provided with threeway, one end of threeway is connected with the air intake opening of canister, the other end of threeway is connected with the oil filler sidewall of described filling spout by circulating gas pipe, circulating gas pipe method of testing in turn includes the following steps: install tank pressure table at the gas-phase space of fuel tank, the probe of smoke chest is installed at the oil filler of filling spout, nozzle is inserted oil filler, read the specified volume read-out V of nozzle and specified inspiratory capacity V1, read the rated voltage drop value Δ P of level control valve, refuel to fuel tank at 25 DEG C, under reading fueling state by tank pressure table, oil vapour pressure value P in fuel tank
0, observe the flow direction of the cigarette at smoke chest probe place simultaneously, if cigarette is blown, then illustrate that oil vapour overflows from oiling oral area, from the oil vapour flow V2>V1 that circulating gas pipe flows out, circulating gas pipe is judged as defective, if cigarette is inhaled into, then illustrate that oil vapour does not overflow from oiling oral area, from the oil vapour flow V2<V1 that circulating gas pipe flows out, circulating gas pipe is judged as qualified.
Relative to prior art, the present invention achieves following beneficial effect: during oiling, and oil vapour flows out from the outlet of level control valve, and a part enters canister and adsorbed, another part gets back to the oral area of filling spout by circulating gas pipe, comes back in fuel tank realize circulation with the air-flow refueled; As long as circulating gas pipe exists the load that namely flow alleviates canister, but the flow of circulating gas pipe can not be excessive, when the oil vapour that circulating gas pipe flows out flows exceed the specified gettering ability of nozzle, the excessive pollution of oil vapour will be caused; When circulating gas pipe flow out oil vapour flow be less than the specified gettering ability of nozzle time, this part oil vapour would not excessive but be inhaled into fuel tank circulation; The present invention installs the probe of smoke chest at the oil filler of filling spout, can indicate oil filler intuitively and whether there is pollution load of overflow phenomenon, thus judge whether circulating gas pipe meets the requirements very easily.
As preferred version of the present invention, the circulating gas pipe to be measured and filling spout that are not installed on fuel tank are connected, the latus rectum of circulating gas pipe is D, the gas source pipe identical with circulating gas pipe latus rectum is connected in the porch of circulating gas pipe, the entrance of gas source pipe is connected with stable source of the gas, in the porch of gas source pipe, gas source valve is installed, at the middle part of gas source pipe, flowmeter is installed, the valve of giving vent to anger that can show aperture is installed in the exit of gas source pipe, in the joint portion of gas source pipe and circulating gas pipe, pipeline pressure table is installed; Valve opening of giving vent to anger is adjusted to full-gear, then regulates the aperture of gas source valve to make the reading P of pipeline pressure table
1be in P
1=P
0-Δ P, at P
1meet the reading Q value of reading flow gauge under above-mentioned condition; If Q>V1, circulating gas pipe is judged as defective, if Q<V1, circulating gas pipe is judged as qualified.Above method of testing can only be welded to after on fuel tank for circulating gas pipe, once circulating gas pipe judges defective, fuel tank and the valve etc. be welded thereon also are scrapped thereupon, waste very large; This programme carries out before can being soldered on fuel tank in circulating gas pipe to be tested, if circulating gas pipe judges defective, fuel tank and annex are not suffered a loss, and have greatly saved material and manufacturing cost, have decreased discarded object; As the reading P regulating the aperture of gas source valve to make pipeline pressure table
1=P
0during-Δ P, after namely installing with fuel tank system, during oiling, the pressure of Liquid level valve outlet port is identical, simulates the working environment after installation; If now the flow Q of circulating gas pipe is greater than the specified inspiratory capacity V1 of nozzle, then oil vapour can be excessive, and circulating gas pipe is defective; If the flow Q of circulating gas pipe is less than the specified inspiratory capacity V1 of nozzle, then oil vapour can not be excessive, and circulating gas pipe is qualified.
As present invention further optimization scheme, as Q>V1, adjust the aperture of air valve, until Q<V1, record the percent travel x of valve of now giving vent to anger; The latus rectum of this circulating gas pipe need be reduced into D ', and D ' with the pass of D is
.As long as the flow Q meeting circulating gas pipe is less than the specified inspiratory capacity V1 of nozzle, oil vapour would not be there is excessive, putting before this, wish that Q is as far as possible larger, to alleviate canister load, also will meet Q<V1 simultaneously, the standard-sized sheet breathing area of valve of giving vent to anger is equal with the sectional area of circulating gas pipe, when valve of giving vent to anger just can meet the demands under percent travel x, the breathing area after circulating gas pipe undergauge should be equal with the breathing area of valve under percent travel x of giving vent to anger, namely
.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation, and accompanying drawing only provides reference and explanation use, is not used to limit the present invention.
Fig. 1 is fuel tank ORVR exhaust system schematic diagram.
Fig. 2 is that circulating gas pipe is installed on the measurement system diagram after on fuel tank.
Fig. 3 is the measurement system diagram that circulating gas pipe is installed on fuel tank and goes forward.
In figure: 1. fuel tank; 2. filling spout; 3. pressure control valve; 4. level control valve; 5. canister; 6. circulating gas pipe; 7. nozzle; 8. tank pressure table; 9. smoke chest; 10. stablize source of the gas; 11. gas source pipes; 12. gas source valves; 13. flowmeters; 14. give vent to anger valve; 15. pipeline pressure tables.
Embodiment
As shown in Figure 1, the sidewall of fuel tank 1 is provided with oil-in, oil-in is connected with the lower end of filling spout 2, the upper end of filling spout 2 is higher than fuel tank and be provided with the oil filler of socket joint nozzle 7, fuel tank 1 top is provided with pressure control valve 3 and level control valve 4, the outlet of level control valve 4 is provided with threeway, and be connected with the air intake opening of canister 5 after one end of threeway is connected with the outlet of pressure control valve 3, the other end of threeway is connected with the oil filler sidewall of filling spout 2 by circulating gas pipe 6 again.
Figure 2 shows that circulating gas pipe is installed on the test macro after on fuel tank, the specified volume read-out V of nozzle 7 and specified inspiratory capacity V1 is given value; The rated voltage drop value Δ P of same level control valve 4 is also given value.Method of testing in turn includes the following steps: install tank pressure table 8 at the gas-phase space of fuel tank, the probe of smoke chest 9 is installed at the oil filler of filling spout 2, nozzle 7 is inserted oil filler, read the specified volume read-out V of nozzle 7 and specified inspiratory capacity V1, read the rated voltage drop value Δ P of level control valve 4, refuel to fuel tank at 25 DEG C, under reading fueling state by tank pressure table 8, the oil vapour pressure value P in fuel tank
0, observe the flow direction of the cigarette at smoke chest 9 probe place simultaneously; If cigarette is blown, then illustrate that oil vapour overflows from oiling oral area, from the oil vapour flow V2>V1 that circulating gas pipe 6 flows out, circulating gas pipe is judged as defective; If cigarette is inhaled into, then illustrate that oil vapour does not overflow from oiling oral area, from the oil vapour flow V2<V1 that circulating gas pipe flows out, circulating gas pipe is judged as qualified.
Figure 3 shows that the test macro that circulating gas pipe is installed on fuel tank and goes forward, method of testing is: the circulating gas pipe to be measured 6 and filling spout 2 that are not installed on fuel tank are connected, the latus rectum of circulating gas pipe is D, the gas source pipe 11 identical with circulating gas pipe latus rectum is connected in the porch of circulating gas pipe 6, the entrance of gas source pipe 11 is connected with stable source of the gas 10, in the porch of gas source pipe 11, gas source valve 12 is installed, at the middle part of gas source pipe, flowmeter 13 is installed, the valve 14 of giving vent to anger that can show aperture is installed in the exit of gas source pipe, in the joint portion of gas source pipe and circulating gas pipe 6, pipeline pressure table 15 is installed.During test, valve 14 aperture of giving vent to anger is adjusted to full-gear, then regulates the aperture of gas source valve 12 to make the reading P of pipeline pressure table 15
1be in P
1=P
0-Δ P, at P
1meet the reading Q value of reading flow gauge 13 under above-mentioned condition; If Q>V1, circulating gas pipe is judged as defective, if Q<V1, circulating gas pipe is judged as qualified.
As Q>V1, adjust the aperture of air valve 14, until Q<V1, record the percent travel x of valve of now giving vent to anger; The latus rectum of this circulating gas pipe need be reduced into D ', and D ' with the pass of D is
.
The foregoing is only the better possible embodiments of the present invention, non-ly therefore limit to scope of patent protection of the present invention.In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop in the protection domain of application claims.The present invention can pass through without the technical characteristic described or adopt existing techniques in realizing, does not repeat them here.
Claims (3)
1. a test method of circulation air pipe of air exhaust system of fuel tank, the sidewall of fuel tank is provided with oil-in, oil-in is connected with the lower end of filling spout, the upper end of filling spout is higher than fuel tank and be provided with the oil filler of socket joint nozzle, the top of fuel tank is provided with level control valve, the outlet of described level control valve is provided with threeway, one end of threeway is connected with the air intake opening of canister, the other end of threeway is connected with the oil filler sidewall of described filling spout by circulating gas pipe, it is characterized in that, circulating gas pipe method of testing in turn includes the following steps: install tank pressure table at the gas-phase space of fuel tank, the probe of smoke chest is installed at the oil filler of filling spout, nozzle is inserted oil filler, read the specified volume read-out V of nozzle and specified inspiratory capacity V1, read the rated voltage drop value Δ P of level control valve, refuel to fuel tank at 25 DEG C, under reading fueling state by tank pressure table, oil vapour pressure value P in fuel tank
0, observe the flow direction of the cigarette at smoke chest probe place simultaneously, if cigarette is blown, then illustrate that oil vapour overflows from oiling oral area, from the oil vapour flow V2>V1 that circulating gas pipe flows out, circulating gas pipe is judged as defective, if cigarette is inhaled into, then illustrate that oil vapour does not overflow from oiling oral area, from the oil vapour flow V2<V1 that circulating gas pipe flows out, circulating gas pipe is judged as qualified.
2. test method of circulation air pipe of air exhaust system of fuel tank according to claim 1, it is characterized in that: the circulating gas pipe to be measured and filling spout that are not installed on fuel tank are connected, the latus rectum of circulating gas pipe is D, the gas source pipe identical with circulating gas pipe latus rectum is connected in the porch of circulating gas pipe, the entrance of gas source pipe is connected with stable source of the gas, in the porch of gas source pipe, gas source valve is installed, at the middle part of gas source pipe, flowmeter is installed, the valve of giving vent to anger that can show aperture is installed in the exit of gas source pipe, in the joint portion of gas source pipe and circulating gas pipe, pipeline pressure table is installed, valve opening of giving vent to anger is adjusted to full-gear, then regulates the aperture of gas source valve to make the reading P of pipeline pressure table
1be in P
1=P
0-Δ P, at P
1meet the reading Q value of reading flow gauge under above-mentioned condition, if Q>V1, circulating gas pipe is judged as defective, if Q<V1, circulating gas pipe is judged as qualified.
3. test method of circulation air pipe of air exhaust system of fuel tank according to claim 2, it is characterized in that: as Q>V1, adjust the aperture of air valve, until Q<V1, record the percent travel x of valve of now giving vent to anger; The latus rectum of this circulating gas pipe need be reduced into D ', and D ' with the pass of D is
.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310699993.1A CN103698119B (en) | 2013-12-19 | 2013-12-19 | Test method of circulation air pipe of air exhaust system of fuel tank |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310699993.1A CN103698119B (en) | 2013-12-19 | 2013-12-19 | Test method of circulation air pipe of air exhaust system of fuel tank |
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| Publication Number | Publication Date |
|---|---|
| CN103698119A CN103698119A (en) | 2014-04-02 |
| CN103698119B true CN103698119B (en) | 2015-12-30 |
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|---|---|---|---|
| CN201310699993.1A Active CN103698119B (en) | 2013-12-19 | 2013-12-19 | Test method of circulation air pipe of air exhaust system of fuel tank |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105466644A (en) * | 2015-12-22 | 2016-04-06 | 芜湖顺荣汽车部件有限公司 | Oil-gas detection device used for oil tank |
| CN106441933A (en) * | 2016-09-21 | 2017-02-22 | 奇瑞汽车股份有限公司 | Fuel oil system air permeability testing frame and its testing method |
| CN113654791B (en) * | 2021-07-21 | 2024-07-23 | 东风亚普汽车部件有限公司 | Rapid detection device and detection method for fuel tank combination valve |
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| CN1071210C (en) * | 1995-05-18 | 2001-09-19 | 罗伯特-博希股份公司 | Method for examing exhaust system of oil tank |
| CN201096593Y (en) * | 2007-08-13 | 2008-08-06 | 比亚迪股份有限公司 | Automobile fuel system hermeticity detector |
| CN103344427A (en) * | 2013-07-17 | 2013-10-09 | 武汉亚普汽车塑料件有限公司 | Automobile fuel tank fuel filler pipe ventilation performance testing device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004190639A (en) * | 2002-12-13 | 2004-07-08 | Hitachi Unisia Automotive Ltd | Airtightness diagnosis device for fuel tank with evaporation-purge device |
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2013
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|---|---|---|---|---|
| CN1071210C (en) * | 1995-05-18 | 2001-09-19 | 罗伯特-博希股份公司 | Method for examing exhaust system of oil tank |
| CN201096593Y (en) * | 2007-08-13 | 2008-08-06 | 比亚迪股份有限公司 | Automobile fuel system hermeticity detector |
| CN103344427A (en) * | 2013-07-17 | 2013-10-09 | 武汉亚普汽车塑料件有限公司 | Automobile fuel tank fuel filler pipe ventilation performance testing device |
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| Title |
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| CN103698119A (en) | 2014-04-02 |
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