CN114509220A - Device and method for detecting leakage point of automobile fuel steam system - Google Patents
Device and method for detecting leakage point of automobile fuel steam system Download PDFInfo
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- CN114509220A CN114509220A CN202011276949.6A CN202011276949A CN114509220A CN 114509220 A CN114509220 A CN 114509220A CN 202011276949 A CN202011276949 A CN 202011276949A CN 114509220 A CN114509220 A CN 114509220A
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- choke valve
- pump
- pressure pump
- pressure
- carbon tank
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3236—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers
- G01M3/3272—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers for verifying the internal pressure of closed containers
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
Abstract
The invention provides a device and a method for detecting a leakage point of an automobile fuel steam system, wherein the detection device comprises a choke valve assembly, a pressure pump device and a pressure display device, the choke valve assembly comprises a first choke valve and a second choke valve, a first pipeline leading to a carbon tank electromagnetic valve is connected at a first interface of an automobile carbon tank through the first choke valve, a second pipeline leading to a fuel tank is connected at a second interface of the carbon tank through the second choke valve, a third interface of the carbon tank is connected with the pressure pump through a third pipeline, and the third pipeline is provided with the pressure display device. The detection device disclosed by the invention is simple in structure, is controlled by an electronic circuit, and is more convenient and accurate to detect by combining an electronic digital pressure gauge.
Description
Technical Field
The invention relates to the technical field of vehicle detection, in particular to a device and a method for detecting leakage points of an automobile fuel steam system.
Background
As the national emission standard is more strict, new methods are added to the emission control of the engine, wherein the new methods comprise leakage detection of the fuel evaporation system, and the detection method can judge whether the fuel evaporation system has leakage. However, this method also has the disadvantage that it is impossible to determine where the specific location of the leak is.
The fuel evaporation system comprises an evaporation leakage diagnosis pump, a pipeline from the diagnosis pump to a carbon tank, the carbon tank, a pipeline from the carbon tank to a front engine, a carbon tank electromagnetic valve, a pipeline from the carbon tank to a fuel tank, the fuel tank and various connectors. The existing repair method is to replace possible related parts in the fuel evaporation system one by one, the method has very low efficiency, the average repair time is about 2 hours per machine, and the cost waste caused by replacing the parts by mistake exists. Therefore, the method can accurately judge the leakage point, has important significance for repair work, can improve the working efficiency and reduce the cost loss caused by misjudgment.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a device and a method for detecting the leakage point of the automobile fuel steam system. The purpose of the invention is realized by the following technical scheme:
the invention firstly provides a device for detecting a leakage point of an automobile fuel steam system, which comprises a choke valve assembly, a pressure pump device and a pressure display device, wherein the choke valve assembly comprises a first choke valve and a second choke valve, a first pipeline leading to a carbon tank electromagnetic valve is connected at a first interface of an automobile carbon tank through the first choke valve, a second pipeline leading to a fuel tank is connected at a second interface of the carbon tank through the second choke valve, a third interface of the carbon tank is connected with the pressure pump through a third pipeline, and the third pipeline is provided with the pressure display device.
Further, the choke valve assembly further comprises a third choke valve, and a third interface of the carbon tank is connected with a third pipeline through the third choke valve.
Further, the first, second, and third choke valves have quick-connect interfaces. The quick connection interface is adopted, so that the quick insertion and extraction of the choke valve and the pipeline can be realized, and the operation efficiency is improved.
Further, the detection device further comprises an electric control switch assembly and a power supply, wherein the first choke valve, the second choke valve and the third choke valve are all electric control choke valves, the three choke valves are respectively connected to the power supply through a first circuit, a second circuit and a third circuit which are connected in parallel, and the switch assembly comprises a first electric control switch, a second electric control switch and a third electric control switch which are respectively arranged on the first circuit, the second circuit and the third circuit and correspondingly control the first choke valve, the second choke valve and the third choke valve.
Further, first automatically controlled switch, second automatically controlled switch and/or third automatically controlled switch are the normal close formula switch, adopt the normal close formula switch for under the condition that does not have relevant operation, the pipeline that the carbon tank is connected is the route, can effectively avoid fuel steam system inside certain node pressure too big or because the diagnostic system pressure that the maloperation to the force pump leads to is too big, thereby ensures the security and the reliability of diagnostic process.
Further, the electric control switch assembly further comprises a fourth electric control switch, the pressure pump adopts an electric pressure pump, the electric pressure pump is connected to the power supply through a fourth circuit, and the fourth electric control switch used for controlling the electric pressure pump is arranged on the fourth circuit.
Furthermore, the electric control switch assembly is integrated on the controller and is controlled by the controller.
Further, pressure display device includes electron digital pressure table, shows the pressure of corresponding system in the testing process through electron digital pressure table, can help the maintainer to know the system state more directly perceivedly more, ensures the rationality and the reliability of maintenance result.
Further, the pressure pump adopts a pneumatic pump.
Further, the third pipeline is provided with a diagnosis pump branch and a pressure pump branch, the diagnosis pump branch is connected with the oil tank sealing diagnosis pump, and the pressure pump branch is connected with the pressure pump.
The invention further provides a method for detecting the leakage point of the automobile fuel steam system, which is characterized in that air-blocking valves are respectively arranged on connecting pipelines between the carbon tank and the fuel tank, between the carbon tank and the carbon tank electromagnetic valve and between the carbon tank and the fuel tank seal diagnosis pump, a pressure pump shunt and a pressure display device are arranged on the connecting pipelines between the carbon tank and the fuel tank seal diagnosis pump, different air-blocking valves are sequentially connected and closed, the fuel steam system is inflated by the pressure pump, and the sealing states of different pipelines are judged by the pressure display device.
Further, the method adopts the detection device to complete detection.
The detection device is exquisite in structure and convenient to use, a pipeline system where a leakage point in a fuel evaporation system is located can be quickly positioned through the mutual matching of the pressure pump and the choke valve, the accurate position of the leakage point is further determined through the seal diagnosis pump, the fault judgment of repair personnel is easy, the working efficiency is improved, and the cost loss caused by the error judgment is reduced, so that the maintenance efficiency is high; meanwhile, the detection is more convenient and accurate by adopting electronic circuit control and combining an electronic digital pressure gauge.
Drawings
FIG. 1 illustrates a vehicle fuel vapor system leak detection device in accordance with a preferred embodiment of the present invention;
in the figure:
101-a carbon tank; 103-engine intake manifold; 202-pressure pump;
102-a fuel tank; 201-tank seal diagnostic pump; 203-pressure display device.
Detailed Description
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
The invention provides a leakage point detection device of an automobile fuel steam system, which comprises a choke valve assembly, a pressure pump device and a pressure display device, wherein the choke valve assembly comprises a first choke valve V1 and a second choke valve V2, a first pipeline P1 leading to a carbon tank electromagnetic valve V4 is connected at a first interface M1 of an automobile carbon tank 101 through a first choke valve V1, a second pipeline P2 leading to a fuel tank 102 is connected at a second interface M2 of the carbon tank through a second choke valve V2, a third interface M3 of the carbon tank 101 is respectively connected with a pressure pump 202 and a fuel tank sealing diagnosis pump 201 through a pressure pump branch P32 and a diagnosis pump branch P31 of a third pipeline P3, and the pressure display device 203 is arranged on the third pipeline P3.
In the illustrated embodiment, the choke valve assembly further includes a third choke valve V3 connected to a third line P3 through a third choke valve V3 at a third port M3 of the carbon canister 101.
In a preferred embodiment, the first, second and third choke valves have quick connect interfaces. The quick plugging of the choke valve and the pipeline can be realized by adopting the quick connection interface, and the operation efficiency is improved.
In the illustrated embodiment, the detection apparatus further includes an electrically controlled switch assembly and a power supply 300, the first choke valve V1, the second choke valve V2 and the third choke valve V3 are all electrically controlled choke valves, the three choke valves are respectively connected to the power supply 300 through a first circuit L1, a second circuit L2 and a third circuit L3 which are connected in parallel, the switch assembly includes a first electrically controlled switch K1, a second electrically controlled switch K2 and a third electrically controlled switch K3 which are respectively arranged on the first circuit L1, the second circuit L2 and the third circuit L3 and correspondingly control the first choke valve V1, the second choke valve V2 and the third choke valve V3, and the first electrically controlled switch K1, the second electrically controlled switch K2 and the third electrically controlled switch K3 are normally closed switches.
In the illustrated embodiment, the electrically controlled switch assembly further includes a fourth electrically controlled switch K4, the pressure pump 202 is an electric pressure pump, the electric pressure pump 202 is connected to the power supply 300 through a fourth circuit L4, and a fourth electrically controlled switch K4 for controlling the electric pressure pump is disposed on the fourth circuit L4.
In a preferred embodiment, the electric control switch assembly is integrated on the controller and is controlled by the controller.
In a preferred embodiment, the pressure display device 203 is an electronic digital pressure gauge.
In a preferred embodiment, the pressure pump is a pneumatic pump.
In a preferred embodiment, the power source is from the vehicle's own ignition.
The device of the invention leads out a pressure pump branch air pipe connected to a pressure pump 202 from the connection part of a fuel tank diagnosis pump and a carbon tank, the pressure pump 202 pumps air into a pipeline through the branch P32, and simultaneously, the pressure of a fuel tank sealing system is measured through the pipeline.
The working principle of the invention mainly utilizes the electromagnetic resistance gas valve to control the opening and closing of each pipeline joint of the fuel steam system, then pumps gas into the corresponding pipeline through the pressure pump 202, judges which part has a leakage point through the pressure state value of the pressure display device 203, and carries out corresponding maintenance or replacement after the judgment. The following provides a method for leak detection using the present device:
according to the aforesaid explanation, the automatically controlled choke valve is connected to each pipeline, ensures that the pipeline is connected completely, makes each automatically controlled switch connect to cigar lighter department and gets the electricity:
step 1: the first electronic switch K1, the second electronic switch K2, and the third electronic switch K3 for controlling the first choke valve V1, the second choke valve V2, and the third choke valve V3 are all opened, so that all three choke valves are in an unvented state. The fourth electronic control switch K4 for controlling the pressure pump 202 is switched on, the pressure pump 202 is controlled to charge air into the pipeline, and at the moment, whether the pressure can rise to 20hpa or not is observed through the pressure display device 203. If 20hpa is exceeded, it is indicated that there is no leak from the tank seal diagnostic pump 201 to the canister 101. If less than 20hpa indicates a leak from the tank seal diagnostic pump 201 to the canister 101, the tank seal diagnostic pump 201 and the piping connected to the canister 101 need to be repaired or replaced.
Step 2: keeping the fourth electronically controlled switch K4 closed ensures that the control circuit L4 of the pressure pump 203 is switched on and the pressure pump 203 continues to operate. The third electronically controlled switch K3, which controls the third choke valve V3, is closed, the third choke valve V3 is put in the vent state, and the first electronically controlled switch K1 and the second electronically controlled switch K2, which keep the first choke valve V1 and the second choke valve V2 open, are put in the non-vent state. At this time, whether the pressure can be increased to 20hpa is observed by the pressure display device 203. If 20hpa is exceeded, it is an indication that canister 101 is not leaking. If less than 20hpa indicates a leak in canister 101, the canister needs to be repaired or replaced.
And step 3: keeping the fourth electronic control K4 closed allows the pressure pump 202 to continue operating, charging the conduit. The second and third electronically controlled switches K2 and K3 that control the second and third choke valves V2 and V3 are closed to bring the two choke valves into a vent state, and the first electronically controlled switch K1 that controls the first choke valve V1 is opened to bring the first choke valve V1 into a non-vent state. At this time, whether the pressure can be increased to 20hpa was observed by the pressure display device. If 20hpa is exceeded, this indicates that there is no leak in the fuel tank 102 and its piping. If less than 20hpa indicates a leak in the tank and its piping, the tank and its piping may need to be repaired or replaced.
And 4, step 4: keeping the fourth electronic control K4 closed allows the pressure pump 202 to continue operating, charging the conduit. The third and first electronically controlled switches K3 and K1, which control the third and first choke valves V3 and V1, are closed to bring the two choke valves into a vent state, and the second electronically controlled switch K2, which controls the second choke valve V2, is opened to bring the second choke valve V2 into a non-vent state. At this time, whether the pressure can be increased to 20hpa was observed by the pressure display device. If 20hpa is exceeded, it indicates that canister solenoid valve V4 and its line are not leaking. If less than 20hpa indicates a leak in canister solenoid valve V4 and its lines, the canister solenoid valve and its lines may need to be repaired or replaced.
After the pipelines with problems are determined through the detection process, the oil tank sealing diagnosis pump 201 is adopted to carry out more detailed diagnosis and detection on the corresponding pipelines, and finally specific leakage points are determined.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, while the invention has been described in detail with reference to the foregoing preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims; the sizes in the drawings and the embodiments are not related to specific objects, and are not used for limiting the protection scope of the invention, and the sizes of the objects can be selected and changed according to actual needs.
Claims (12)
1. The utility model provides an automobile fuel steam system leakage point detection device, its characterized in that, includes choke valve subassembly, force pump device and pressure display device, the choke valve subassembly includes first choke valve and second choke valve, and the first pipeline that leads to the carbon tank solenoid valve is connected through first choke valve to the first kneck of car carbon tank, and the second kneck of carbon tank passes through the second choke valve and connects the second pipeline that leads to the fuel tank, and the third interface of carbon tank passes through third tube coupling force pump, be equipped with pressure display device on the third pipeline.
2. A leak detection device for a fuel vapor system of an automobile as recited in claim 1, wherein the choke valve assembly further comprises a third choke valve, and a third port of the canister is connected to the third line through the third choke valve.
3. The apparatus of claim 2, wherein the first choke valve, the second choke valve and the third choke valve have quick-connect interfaces.
4. The vehicle fuel vapor system leak detection device of claim 2, further comprising an electrically controlled switch assembly and a power source, wherein the first, second and third choke valves are electrically controlled choke valves, the three choke valves are connected to the power source through a first, second and third parallel circuits, respectively, and the switch assembly comprises a first, second and third electrically controlled switch respectively disposed on the first, second and third circuits and controlling the first, second and third choke valves correspondingly.
5. The device of claim 4, wherein the first electronic control switch, the second electronic control switch and/or the third electronic control switch are normally closed switches.
6. The device of claim 4, wherein the electrical switch assembly further comprises a fourth electrical switch, the pressure pump is an electric pressure pump, the electric pressure pump is connected to a power supply through a fourth circuit, and the fourth circuit is provided with the fourth electrical switch for controlling the electric pressure pump.
7. A leakage point detection device for an automobile fuel vapor system as claimed in claim 4, wherein the electrical switch assembly is integrated with the controller and is controlled by the controller.
8. A device for detecting leakage points of an automobile fuel vapor system according to any one of claims 1 to 7, wherein the pressure display device comprises an electronic digital pressure gauge.
9. A device for detecting a leakage point of an automobile fuel steam system according to any one of claims 1 to 7, wherein the pressure pump is a pneumatic pump.
10. A leakage point detection device for an automobile fuel vapor system according to any one of claims 1 to 7, wherein the third pipeline is provided with a diagnosis pump branch and a pressure pump branch, the diagnosis pump branch is connected with the oil tank seal diagnosis pump, and the pressure pump branch is connected with the pressure pump.
11. A method for detecting leakage point of automobile fuel steam system is characterized in that air-blocking valves are respectively arranged on connecting pipelines between a carbon tank and a fuel tank, a carbon tank and a carbon tank electromagnetic valve, and a carbon tank and a fuel tank seal diagnosis pump, a pressure pump shunt and a pressure display device are arranged on the connecting pipelines between the carbon tank and the fuel tank seal diagnosis pump, different air-blocking valves are sequentially connected and closed, the pressure pump is used for inflating the fuel steam system, and the seal states of different pipelines are judged by the aid of the pressure display device.
12. The method for detecting the leakage point of the automobile fuel steam system according to claim 11, wherein the detection is completed by the detection device according to any one of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011276949.6A CN114509220A (en) | 2020-11-16 | 2020-11-16 | Device and method for detecting leakage point of automobile fuel steam system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011276949.6A CN114509220A (en) | 2020-11-16 | 2020-11-16 | Device and method for detecting leakage point of automobile fuel steam system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114509220A true CN114509220A (en) | 2022-05-17 |
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ID=81546634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011276949.6A Pending CN114509220A (en) | 2020-11-16 | 2020-11-16 | Device and method for detecting leakage point of automobile fuel steam system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114509220A (en) |
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2020
- 2020-11-16 CN CN202011276949.6A patent/CN114509220A/en active Pending
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