CN216665767U

CN216665767U - OBD detection device for fuel system with mechanical fuel tank isolating valve

Info

Publication number: CN216665767U
Application number: CN202122604045.8U
Authority: CN
Inventors: 段文强; 李卫民; 冉林; 李文浩
Original assignee: Tengsuo Auto Parts Huangshi Co ltd
Current assignee: Tengsuo Auto Parts Huangshi Co ltd
Priority date: 2021-10-27
Filing date: 2021-10-27
Publication date: 2022-06-03
Anticipated expiration: 2031-10-27

Abstract

The utility model relates to the technical field of automobile fuel system OBD detection equipment, in particular to an OBD detection device for a fuel system with a mechanical fuel tank isolating valve, a two-position three-way valve is added between the carbon canister and the ash filter, and is matched with the ash filter in a proper structure, and the two-position three-way electromagnetic valve is connected with the oil tank, when the ECU sends an OBD diagnosis signal, the whole EVAP system can not be subjected to OBD detection, a two-position three-way electromagnetic valve is added at the moment, when the OBD diagnosis signal is received, the carbon canister electromagnetic valve is opened, the coil of the two-position three-way electromagnetic valve is electrified, the first outlet is closed, the inner area without the ash filter is vacuumized, the pressure value in the area is monitored through the pressure sensor, and whether the pressure attenuation curve in the standard test time is in the calibrated test pressure curve or not is judged to realize OBD detection, so that the problem that whether leakage occurs inside the oil tank or not cannot be detected in the prior art is solved.

Description

OBD detection device for fuel system with mechanical fuel tank isolating valve

Technical Field

The utility model relates to the technical field of automobile fuel system OBD detection equipment, in particular to an OBD detection device for a fuel system with a mechanical fuel tank isolating valve.

Background

The high-pressure fuel system mainly comprises a fuel tank, an engine, a carbon canister and a fuel tank isolation valve, wherein the fuel tank isolation valve is connected between the fuel tank and the carbon canister and used for controlling the internal pressure of the fuel tank. The fuel evaporation of the automobile is comprehensively controlled by an EVAP system, and the fuel evaporation system generally comprises a fuel tank, an active carbon canister control electromagnetic valve and other components, and can adopt an engine control module to control the fuel evaporation. And whether detect whole system and leak and be a very important link, detect and carry out OBD by car ECU and detect and accomplish, OBD detects the principle: when OBD detection is carried out, a closed space is formed in the whole EVAP system, and whether the whole system leaks or not is detected by calibrating the pressure sensor.

The prior art is usually realized by adopting a mechanical structure, and discloses a fuel tank filling device and a high-pressure fuel system. When the fuel tank is filled with fuel, the fuel gun is inserted into the filling pipeline and then pushes the elastic sheet to rotate, the elastic sheet drives the sealing piece to move through the linkage mechanism, so that the first tank body is communicated with the second tank body, namely the fuel tank is communicated with the carbon tank, and the pressure relief function of the fuel tank is realized. This structure has serious drawbacks: when the ECU sends an OBD diagnostic signal, the enclosed space formed does not contain the oil tank, and it is not possible to detect whether leakage occurs inside the oil tank.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

The embodiment of the utility model provides an OBD (on-board diagnostics) detection device for a fuel system with a mechanical fuel tank isolating valve, which is used for solving the defects that the existing fuel system has inaccurate detection result and can not detect whether the inside of a fuel tank leaks or not.

(II) contents of utility model

The embodiment of the utility model provides an OBD detection device for a fuel system with a mechanical oil tank isolating valve, which comprises a filling pipeline, wherein the filling pipeline is provided with a pressure relief hole; the device also comprises an oil tank and a carbon tank which are respectively arranged at two ends of the filling pipeline; the oil tank and the carbon tank are respectively provided with an oil tank interface and a carbon tank interface which correspond to each other; a mechanical oil tank isolating valve is also arranged between the oil tank interface and the carbon canister interface, one end of the mechanical oil tank isolating valve is movably connected to the oil tank interface, and when the oil gun is inserted into the filling pipeline, the mechanical oil tank isolating valve is pushed to open a pressure relief hole of the filling pipeline; when the refueling gun is in an initial state without being inserted, the other end of the mechanical oil tank isolating valve is inserted into the pressure relief hole of the refueling pipeline, so that a closed space is formed at one side of the refueling pipeline communicated with the carbon canister; an oil pump and an oil filling limiting valve are arranged in the oil tank; the carbon canister is connected with the engine through a carbon canister electromagnetic valve; the carbon canister is connected with the ash filter through a two-position three-way valve, and the two-position three-way valve is connected with the oil tank through an independent pipeline.

Preferably, the two-position three-way valve comprises an electromagnet, a coil of the electromagnet is connected to one side of the transmission rod, the other side of the transmission rod is horizontally fixed, a piston piece is fixedly arranged on the transmission rod, an inlet is formed in the bottom of a valve body of the two-position three-way valve, a first outlet and a second outlet are formed in the upper portion of the valve body of the two-position three-way valve, the electromagnet drives the transmission rod to move horizontally, and the inlet and the first outlet or the inlet and the second outlet are sequentially communicated.

(III) advantageous effects

According to the OBD detection device for the fuel system with the mechanical oil tank isolating valve, the CVS between the carbon tank and the ash filter is replaced by the two-position three-way electromagnetic valve which is connected with the oil tank, when an ECU sends an OBD diagnosis signal, OBD detection cannot be performed on the whole EVAP system, the two-position three-way electromagnetic valve is added at the moment, when the OBD diagnosis signal is received, the carbon tank electromagnetic valve is opened, the coil of the two-position three-way electromagnetic valve is electrified, the first outlet is closed, the inner side area excluding the ash filter is vacuumized, the pressure value of the area is monitored through the pressure sensor, whether the pressure attenuation curve in standard test time is in a calibrated test pressure curve or not is judged to achieve OBD detection, and therefore the defect that whether leakage occurs inside the oil tank cannot be detected in the prior art is overcome.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of the overall configuration of a sub-chamber OBD detection device for a fuel system with a mechanical tank block valve, in accordance with an embodiment of the present invention;

fig. 2 is a schematic diagram of a prior art structure.

FIG. 3 is a schematic structural diagram of a two-position three-way solenoid valve according to an embodiment of the present invention;

description of reference numerals:

1: a filling pipeline; 2: an oil tank;

4: a mechanical tank block valve; 5: an oil pump;

71: an electromagnet; 3: a canister;

72: a transmission rod; 6: a refueling restriction valve;

73: a piston member; 9: an engine;

74: an inlet; 10: and (5) filtering ash.

75: a first outlet; 76: a second outlet.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "first", "second" and "third" are used for the sake of clarity in describing the numbering of the components of the product and do not represent any substantial difference, unless explicitly stated or limited otherwise. The directions of "up", "down", "left" and "right" are all based on the directions shown in the attached drawings. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.

It is to be understood that, unless otherwise expressly specified or limited, the term "coupled" is used broadly, and may, for example, refer to directly coupled devices or indirectly coupled devices through intervening media. The specific meaning of the above terms in the embodiments of the present invention can be understood in specific cases by those skilled in the art.

The OBD detection device for a fuel system with a mechanical tank block valve 4 provided by the embodiment, as shown in fig. 1, includes a filling pipe 1, where the filling pipe 1 is provided with a pressure relief hole; the device also comprises an oil tank and a carbon canister 3 which are respectively arranged at the two ends of the filling pipeline 1; the oil tank and the carbon canister 3 are respectively provided with an oil tank interface and a carbon canister 3 interface which correspond to each other; a mechanical oil tank isolating valve 4 is further arranged between the oil tank interface and the carbon canister 3 interface, one end of the mechanical oil tank isolating valve 4 is movably connected to the oil tank interface, and when a fuel nozzle is inserted into the filling pipeline 1, the mechanical oil tank isolating valve 4 is pushed to open a pressure relief hole of the filling pipeline 1; when the refueling gun is in an initial state without being inserted, the other end of the mechanical oil tank isolating valve 4 is inserted into the pressure relief hole of the refueling pipeline 1, so that a closed space is formed at one side of the refueling pipeline 1 communicated with the carbon canister 3; an oil pump 5 and an oil filling limiting valve 6 are arranged in the oil tank; the carbon canister 3 is connected with an engine 9 through a carbon canister 3 electromagnetic valve; the canister 3 is connected to the ash filter 10 by a two-position three-way valve, and the two-position three-way valve is connected to the oil tank by a separate pipe.

As shown in fig. 3, the two-position three-way valve comprises an electromagnet 71, a coil of the electromagnet 71 is connected to one side of a transmission rod 72, the other side of the transmission rod 72 is fixed horizontally, a piston member 73 is fixed on the transmission rod 72, an inlet 74 is arranged at the bottom of a valve body of the two-position three-way valve, a first outlet 75 and a second outlet 76 are arranged at the upper part of the valve body, and the working principle is that: in the normal state, the coil is de-energized, the inlet 74 and the first outlet 75 are closed, and the second outlet 76 is closed; when the coil is energized, the first outlet 75 is closed and the inlet 74 and the second outlet 76 are open; when the ECU sends an OBD diagnosis signal, the electromagnetic valve of the carbon tank 3 is opened, the coil of the two-position three-way electromagnetic valve is electrified, the area on the inner side of the ash filter 10 is vacuumized, the pressure value of the area is monitored through the pressure sensor, and whether the pressure attenuation curve in the standard test time is in the calibrated test pressure curve or not is judged, so that OBD detection is realized, and the defect that whether the inside of the oil tank is leaked or not can not be detected in the prior art, and the detection result is inaccurate is overcome.

Compared with the prior art (as shown in figure 2), because mechanical type oil tank block valve 4 separates the oil tank region and canister 3 region, can't detect the OBD to the oil tank is inside, this application scheme is in fact that increased a two-position three-way valve between canister 3 and ash filter 10 to suitable structural adaptation has been carried out, has realized accurate OBD and has detected.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The OBD detection device for the fuel system with the mechanical oil tank isolating valve is characterized by comprising a filling pipeline (1), wherein the filling pipeline (1) is provided with a pressure relief hole; the filling device also comprises an oil tank (2) and a carbon tank (3) which are respectively arranged at two ends of the filling pipeline; the oil tank (2) and the carbon canister (3) are respectively provided with an oil tank interface and a carbon canister interface which correspond to each other; a mechanical oil tank isolating valve (4) is further arranged between the oil tank interface and the carbon canister interface, one end of the mechanical oil tank isolating valve (4) is movably connected to the oil tank interface, and when a fuel nozzle is inserted into a filling pipeline, the mechanical oil tank isolating valve is pushed to open a pressure relief hole of the filling pipeline; when the refueling gun is in an initial state without being inserted, the other end of the mechanical oil tank isolating valve (4) is inserted into a pressure relief hole of the filling pipeline (1), so that a closed space is formed at one side of the filling pipeline (1) communicated with the carbon tank (3); an oil pump (5) and an oil filling limiting valve (6) are arranged in the oil tank (2); the carbon canister (3) is connected with an engine through a carbon canister electromagnetic valve; the carbon tank (3) is connected with the ash filter (10) through a two-position three-way valve (7), and the two-position three-way valve (7) is connected with the oil tank (2) through an independent pipeline.

2. The OBD detection apparatus for a fuel system with a mechanical tank block valve according to claim 1, wherein the two-position three-way valve comprises an electromagnet (71), a coil of the electromagnet is connected to one side of a transmission rod (72), the other side of the transmission rod is horizontally fixed, a piston member (73) is fixedly arranged on the transmission rod, an inlet (74) is arranged at the bottom of a valve body of the two-position three-way valve, a first outlet (75) and a second outlet (76) are arranged at the upper part of the valve body, and the electromagnet drives the transmission rod to move horizontally to sequentially communicate the inlet and the first outlet (75) or the inlet and the second outlet (76).