CN220168034U - Diagnosis device casing, diagnosis device and vehicle - Google Patents

Abstract

The utility model discloses a housing of a diagnostic device, a diagnostic device and a vehicle, wherein the diagnostic device is used for diagnosing evaporation leakage condition of fuel, and the housing comprises: a main housing having first and second cavities arranged at intervals; and the cover plate is an independent component and covers one side of the main shell, and the cover plate is matched with the main shell to define a gas channel communicated between the first cavity and the second cavity. According to the shell of the diagnostic device, the die structure for producing the main shell can be simplified, the die cost is reduced, meanwhile, the number of die holes for producing the main shell is increased, the production efficiency for producing the main shell is improved, and the riveting plug for plugging the gas channel is omitted, so that the production efficiency of the shell of the diagnostic device is improved, and the production cost of the shell of the diagnostic device is reduced.

Description

Diagnosis device casing, diagnosis device and vehicle

Technical Field

The present utility model relates to the field of vehicle technologies, and in particular, to a housing of a diagnostic device, and a vehicle.

Background

With the improvement of living standard, automobiles become a common riding tool, and if an automobile oil tank leaks and volatilizes into air, air pollution can be caused, and a diagnosis device for detecting the leakage of the oil tank is needed.

In the related art, the shell of the fuel evaporation leakage diagnosis device has the advantages that the gas channel is integrally formed on the shell, one end of the gas channel is open, and therefore, the die structure for casting the shell is complex, and the die cost can be increased. When the shell is cast, the core pulling structure is required to pull the core from one side of the open end of the shell gas channel, so that the core pulling stroke is long, the cavity cannot be arranged on one side of the shell mould core pulling, the cavity arranging number of the mould is limited, and the production efficiency of the shell is reduced. In addition, in order to seal the gas passage, a stopper needs to be swaged at the open end of the gas passage after the casting of the housing is completed, further increasing the production cost.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. The utility model is based on the object of providing a housing for a diagnostic device which increases the production efficiency and reduces the production costs.

The utility model also provides a diagnosis device with the shell of the diagnosis device.

The utility model provides a vehicle with the diagnosis device.

The housing of the diagnostic device according to the first aspect of the present utility model includes: a main housing having first and second cavities arranged at intervals; and the cover plate is an independent component and covers one side of the main shell, and the cover plate is matched with the main shell to define a gas channel communicated between the first cavity and the second cavity.

According to the shell of the diagnostic device, the die structure for producing the main shell can be simplified, the die cost is reduced, meanwhile, the number of die holes for producing the main shell is increased, the production efficiency for producing the main shell is improved, and the riveting plug for plugging the gas channel is omitted, so that the production efficiency of the shell of the diagnostic device is improved, and the production cost of the shell of the diagnostic device is reduced.

According to some embodiments of the utility model, the cover plate is welded to the main housing.

According to some embodiments of the utility model, a positioning groove is formed in one side of the main shell, which faces the cover plate, and the cover plate is arranged in the positioning groove and is in sealing connection with the groove wall of the positioning groove.

According to some embodiments of the utility model, the peripheral edge of the positioning groove is flush with a side surface of the cover plate facing away from the main housing.

According to some embodiments of the utility model, the main housing comprises: the device comprises an outer shell part, a first separation part and a second separation part, wherein the first separation part is arranged on the inner side of the outer shell part, the first separation part is vertically arranged to separate the first cavity from the second cavity, the second separation part is connected to the lower side of the first separation part and horizontally extends, and the cover plate is arranged on the lower side of the second separation part and is matched with the second separation part to define the gas channel.

According to some embodiments of the utility model, the second partition is an upwardly convex arcuate plate.

According to some embodiments of the utility model, a boss protruding towards the second cavity is arranged at one end of the second partition part towards the second cavity, a first through hole penetrating through the boss and a reference hole are formed on the boss, and the first through hole and the reference hole are arranged at intervals and are communicated between the gas channel and the second cavity.

According to some embodiments of the utility model, the main housing is integrally formed.

A diagnostic device according to a second aspect of the present utility model is characterized by comprising: the above-described case of the diagnostic device according to the first aspect of the present utility model is formed with a first through hole that communicates between the gas passage and the second cavity; the air pump is arranged in the first cavity and used for pumping air into the air channel; and the electromagnetic valve is arranged in the second cavity and used for opening and closing the first through hole.

According to the diagnostic device of the second aspect of the present utility model, by providing the above-described housing of the diagnostic device according to the first aspect of the present utility model, the production cost of the diagnostic device can be reduced.

According to some embodiments of the utility model, the electromagnetic valve comprises a valve seat and a valve core, the valve seat is arranged in the second cavity and is in sealing connection with the peripheral wall of the second cavity, a vent hole penetrating through the valve seat is formed in the valve seat, the valve core is arranged on one side of the valve seat facing the gas channel, the valve core is movable between a first position and a second position relative to the valve seat, the valve core seals the first through hole in the first position, the valve core seals the vent hole in the second position, an air interface and a to-be-diagnosed equipment interface which are arranged at intervals are formed in the shell, the first air channel and the second air channel are further formed in the shell, the air interface is communicated with the first cavity through the first air channel, the air interface is communicated with the second cavity on one side of the valve seat facing the gas channel through the second air channel, and the to-be-diagnosed equipment interface is communicated with the second cavity on one side of the valve seat facing the gas channel.

A vehicle according to a third aspect of the present utility model includes the above-described diagnostic apparatus according to the second aspect of the present utility model.

According to the vehicle of the third aspect of the present utility model, by providing the above-described diagnostic device according to the second aspect of the present utility model, it is possible to realize detection of fuel leakage of the vehicle and reduce the cost of production of the vehicle.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

FIG. 1 is a schematic view of a housing of a diagnostic device according to an embodiment of the present utility model;

FIG. 2 is a schematic view of another angle of the housing of the diagnostic device shown in FIG. 1;

FIG. 3 is a schematic view of a further angle of the housing of the diagnostic device shown in FIG. 2;

FIG. 4 is a cross-sectional view of a housing of the diagnostic device shown in FIG. 2;

FIG. 5 is a cross-sectional view of a diagnostic device in an adsorption mode according to an embodiment of the present utility model;

FIG. 6 is a schematic diagram of the diagnostic device shown in FIG. 5 during operation on a vehicle;

fig. 7 is a cross-sectional view of a diagnostic device in a desorption mode according to an embodiment of the present utility model;

FIG. 8 is a schematic diagram of the diagnostic device shown in FIG. 7 during operation on a vehicle;

fig. 9 is a cross-sectional view of a diagnostic device in a learning mode according to an embodiment of the present utility model;

FIG. 10 is a schematic diagram of the diagnostic device shown in FIG. 9 during operation on a vehicle;

FIG. 11 is a cross-sectional view of a diagnostic device in a diagnostic mode according to an embodiment of the present utility model;

FIG. 12 is another angular cross-sectional view of the diagnostic device shown in FIG. 11 in diagnostic mode;

FIG. 13 is a schematic diagram of the diagnostic device shown in FIG. 11 during operation on a vehicle;

FIG. 14 is a schematic view of the air pump shown in FIG. 11;

fig. 15 is another angular cross-sectional view of the diagnostic device shown in fig. 5.

Reference numerals:

10000. a vehicle;

1000. a diagnostic device;

100. a housing;

10. a main housing; 11. a first cavity; 12. a second cavity; 13. a gas channel; 14. a housing portion; 15. a first partition; 16. a second partition; 161. a boss; 1611. a first through hole; 1612. a reference hole; 17. a positioning groove;

20. a cover plate;

30. an atmospheric interface;

40. an interface of the equipment to be diagnosed;

50. a first airway;

60. a second airway;

200. an air pump; 210. an air inlet;

300. an electromagnetic valve; 310. a valve seat; 320. a valve core; 330. a vent hole;

2000. a carbon tank;

3000. a carbon canister control valve;

4000. an intake manifold;

5000. a fuel tank;

6000. a fuel tank shut-off valve.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

A case 100 of a diagnostic device 1000 according to an embodiment of the first aspect of the present utility model is described below with reference to fig. 1 to 15.

As shown in fig. 1 to 5, according to a case 100 of a diagnostic device 1000 according to an embodiment of the first aspect of the present utility model, the diagnostic device 1000 is used for diagnosing evaporation leakage of fuel, and the case 100 includes: a main housing 10 and a cover plate 20.

Specifically, the main casing 10 has first and second cavities 11 and 12 arranged at intervals, and the cover plate 20 is a separate member and covers one side of the main casing 10, and the cover plate 20 and the main casing 10 cooperate to define a gas passage 13 communicating between the first and second cavities 11 and 12.

Wherein the first cavity 11 and the second cavity 12 are used for arranging elements for realizing the function of diagnosing the fuel evaporation leakage condition of the diagnosis device 1000.

In this embodiment, the cover plate 20 and the main housing 10 may be separately manufactured by cooperatively defining the gas passage 13 in the main housing 10 by the cover plate 20. The cover plate 20 has a simpler shape, higher production efficiency and lower production cost.

The gas channel 13 has a groove shape on the main housing 10, so that the mold structure of the main housing 10 is relatively simple, and the cost of the mold is relatively low, thereby reducing the production cost of the main housing 10.

When the main casing 10 is cast for core pulling, the core pulling structure can pull core from the vertical direction (for example, the up-down direction shown in fig. 5) of the extending direction (for example, the left-right direction shown in fig. 5) of the gas passage 13, so that core pulling between adjacent acupoints does not affect in the extending direction of the gas passage 13, and the number of acupoints of the mold can be doubled, thereby greatly improving the production efficiency of the main casing 10, and further improving the production efficiency of the casing 100 of the diagnostic apparatus 1000. In addition, the housing 100 of the diagnostic device 1000 can eliminate the rivet plug for blocking the gas passage 13, thereby further reducing the production cost.

According to the case 100 of the diagnostic device 1000 of the first aspect of the embodiment of the present utility model, the mold structure for producing the main case 10 can be simplified, the mold cost can be reduced, and at the same time, the number of mold cavities for producing the main case 10 can be increased, the production efficiency for producing the main case 10 can be improved, and the rivet plug for blocking the gas passage 13 can be omitted, thereby improving the production efficiency of the case 100 of the diagnostic device 1000, and reducing the production cost of the case 100 of the diagnostic device 1000.

In some embodiments of the present utility model, the cover plate 20 is welded to the main casing 10. The welding connection has high production efficiency, the sealing of the joint can be realized, the cover plate 20 is connected with the main shell 10 through the welding connection, the production efficiency can be increased, and the sealing connection of the cover plate 20 and the main shell 10 is realized.

In some embodiments of the present utility model, the cover plate 20 is connected with the main casing 10 by laser welding. The laser welding speed is high, and the stress deformation of the welding position is small, so that the production efficiency can be further improved by connecting the cover plate 20 with the main shell 10 through laser welding, and the yield of the shell 100 of the diagnosis device 1000 can be improved.

In some embodiments of the present utility model, as shown in fig. 5, 7, 9 and 11, a side of the main casing 10 facing the cover plate 20 (e.g., a lower side of the main casing 10 shown in fig. 5) is provided with a positioning groove 17, and the cover plate 20 is provided in the positioning groove 17 and is sealingly connected with a groove wall of the positioning groove 17. In the process of assembling the cover plate 20 on the main shell 10, the positioning groove 17 can play a role in positioning and guiding, so that the cover plate 20 can be quickly and accurately mounted on the main shell 10, and accordingly, the assembly efficiency and the assembly precision are improved.

In some embodiments of the present utility model, as shown in fig. 5, 7, 9 and 11, the peripheral edge of the positioning groove 17 is flush with a side surface of the cover plate 20 facing away from the main casing 10. In this way, the peripheral welding connection between the cover plate 20 and the positioning groove 17 is facilitated, and meanwhile, the probability that the welding seam cannot completely block the gap between the cover plate 20 and the positioning groove 17 is reduced, so that the yield of the diagnosis device 1000 during the production of the shell 100 is improved.

In some embodiments of the present utility model, as shown in fig. 1 and 2, the main casing 10 includes: the housing part 14, the first partition part 15 and the second partition part 16, the first partition part 15 is arranged on the inner side of the housing part 14, the first partition part 15 is vertically arranged to partition the first cavity 11 and the second cavity 12, therefore, the mutual contact of parts in the first cavity 11 and the second cavity 12 can be prevented from affecting the operation of the diagnostic device 1000, and the first partition part 15 can also provide support for the parts in the first cavity 11 and the second cavity 12, so that the structure of the diagnostic device 1000 is more stable.

The second partition 16 is connected to the lower side of the first partition 15 and horizontally extends, and the cover plate 20 is provided at the lower side of the second partition 16 and cooperates with the second partition 16 to define the gas passage 13, so that the gas passage 13 can be disposed at the bottom walls of the first and second cavities 11 and 12, and thus the gas passage 13 can be communicated with the first and second cavities 11 and 12.

In some embodiments of the present utility model, the second separator 16 is an upwardly convex arcuate plate. In this way, when the cover plate 20 and the second partition 16 are coupled together, the gas passage 13 may be defined between the cover plate 20 and the second partition 16.

In some embodiments of the present utility model, as shown in fig. 1 to 4, one end of the second partition 16 facing into the second cavity 12 is provided with a boss 161 protruding into the second cavity 12, and the boss 161 is formed with a first through hole 1611 and a reference hole 1612 penetrating the boss 161, the first through hole 1611 and the reference hole 1612 being spaced apart and communicating between the gas passage 13 and the second cavity 12.

The first through hole 1611 has two states of opening and closing, and the surface of the boss 161 is flat, so that the first through hole 1611 can be conveniently closed.

When the first through hole 1611 is closed, as shown in fig. 9 and 10, the gas passage 13 communicates with the atmosphere through the reference hole 1612, and the gas introduced into the gas passage 13 leaks from the reference hole 1612 to the atmosphere, the diagnostic device 1000 measures the leakage amount of the gas through the reference hole 1612 at this time as a reference value for diagnosing the fuel evaporation leakage amount in the apparatus to be diagnosed.

When the first through hole 1611 is opened, as shown in fig. 11 to 13, the gas channel 13 is communicated with the device to be diagnosed through the reference hole 1612 and the first through hole 1611, gas enters the device to be diagnosed through the first through hole 1611 and the reference hole 1612, the diagnostic device 1000 measures the leakage amount of the gas of the device to be diagnosed and compares the leakage amount of the gas through the reference hole 1612, and if the leakage amount of the gas in the device to be diagnosed is smaller than the leakage amount of the gas in the reference hole 1612, the gas channel meets the standard, otherwise, the gas channel does not meet the standard.

In some embodiments of the present utility model, the main housing 10 is integrally formed. In this way, the production efficiency of the main casing 10 is high, and at the same time, the sealing reliability of each structure on the main casing 10 is high, thereby improving the reliability in the operation of the diagnostic device 1000.

A diagnostic device 1000 according to an embodiment of the second aspect of the present utility model is described below with reference to fig. 1 to 15.

The diagnostic device 1000 according to the embodiment of the second aspect of the present utility model, as shown in fig. 5, 7, 9 and 11, includes: the above-described housing 100, air pump 200, and solenoid valve 300 of the diagnostic device 1000 according to the first aspect embodiment of the present utility model.

Specifically, the housing 100 is formed with a first through hole 1611 communicating between the gas passage 13 and the second cavity 12, the air pump 200 is provided in the first cavity 11 for pumping air into the gas passage 13, and the electromagnetic valve 300 is provided in the second cavity 12 for opening and closing the first through hole 1611.

When the solenoid valve 300 closes the first through hole 1611, as shown in fig. 9 and 10, the operation mode of diagnosing the amount of leakage of the reference hole 1612 is set to a learn mode in which the gas pumped into the gas passage 13 by the gas pump 200 continuously increases the gas pressure in the gas passage 13, and at the same time, part of the gas leaks into the atmosphere through the reference hole 1612, and when the gas pressure in the gas passage 13 is stabilized, the current in the gas pump 200 at this time is recorded.

When the solenoid valve 300 opens the first through hole 1611, as shown in fig. 11 to 13, the operation mode of diagnosing the leakage amount of the device to be diagnosed is set to the diagnosis mode in which the air pump 200 pumps the air into the air passage 13, the air enters the device to be diagnosed through the reference hole 1612 and the first through hole 1611 and the air pressure in the device to be diagnosed is continuously increased, and the current in the air pump 200 at this time is recorded when the air pressure in the device to be diagnosed is stabilized.

Comparing the two currents, if the current in the air pump 200 in the diagnosis mode is greater than the current in the air pump 200 in the learning mode, the pressure when the air pressure in the equipment to be diagnosed is stable is greater than the pressure when the air channel 13 is communicated with the atmosphere through the reference hole 1612 and is stable, namely the leakage amount of the equipment to be diagnosed is smaller than the leakage amount of the reference hole 1612; similarly, if the current in the air pump 200 in the diagnosis mode is smaller than the pressure of the current in the air pump 200 in the learning mode, it means that the pressure when the air pressure in the device to be diagnosed is stable is smaller than the pressure when the air passage 13 is stable through the reference hole 1612 and the atmosphere, i.e. the leakage amount of the device to be diagnosed is larger than the leakage amount of the reference hole 1612.

In some embodiments of the present utility model, as shown in fig. 5, 7, 9, 11 and 12, the solenoid valve 300 includes a valve seat 310 and a valve core 320, the valve seat 310 is disposed in the second cavity 12 and is in sealing connection with a peripheral wall of the second cavity 12, a vent hole 330 penetrating the valve seat 310 is formed in the valve seat 310, the valve core 320 is disposed on a side of the valve seat 310 facing the gas channel 13 (for example, a lower side of the valve seat 310 shown in fig. 5), the valve core 320 is movable between a first position and a second position with respect to the valve seat 310, the valve core 320 blocks the first through hole 1611 in the first position, the valve core 320 blocks the vent hole 330 in the second position, an air interface 30 and a device interface 40 to be diagnosed are formed on the housing 100 in a spaced arrangement, the housing 100 further has a first air passage 50 and a second air passage 60 therein, the air interface 30 communicates with the first cavity 11 through the first air passage 50, the air interface 30 communicates with the second cavity 12 on a side of the valve seat 310 facing the gas channel 13 (for example, an upper side of the valve seat 310 shown in fig. 5) facing the gas channel 13, the second air interface 40 communicates with the second cavity 12 on a side of the valve seat 310 facing the gas channel 13. Wherein, in operation, the diagnostic device 1000 is connected to the device to be diagnosed interface 40.

In the learning mode, as shown in fig. 9 and 10, the valve element 320 blocks the first through hole 1611 at the first position, the device interface 40 to be diagnosed is not in communication with the device to be diagnosed, air enters the air pump 200 through the first air passage 50 via the air interface 30, the air pump 200 pumps the air pump 200 into the air passage 13, part of the air leaks out through the reference hole 1612, and then flows to the air interface 30 through the second air passage 60 via the air vent 330.

In the diagnostic mode, as shown in fig. 11 to 13, the valve core 320 blocks the vent 330 in the second position, the device interface 40 to be diagnosed and the device to be diagnosed are communicated, air enters the air pump 200 through the first air passage 50 via the air interface 30, the air pump 200 pumps the air pump 200 into the air passage 13, and the air flow enters the device interface 40 to be diagnosed from the second cavity 12 through the reference hole 1612 and the first through hole 1611, and then enters the device to be diagnosed.

In some embodiments of the present utility model, as shown in fig. 14 and 15, the air pump 200 has an air inlet 210, the air inlet 210 being opposite to and communicating with the outlet end of the first air passage 50 in the air flow direction of the air inlet 210.

In the prior art, the air inlet 210 of the air pump 200 is not opposite to the first air passage 50 in the first cavity 11, when the air pump 200 works, external air flow enters the first cavity 11 from the air interface 30 through the first air passage 50, then passes through a gap between the air pump 200 and the inner wall of the first cavity 11 and enters the air inlet 210, and because the gap between the air pump 200 and the inner wall of the first cavity 11 is smaller, the air inlet efficiency of the air flow entering the air pump 200 is lower, the air inlet amount in the air pump 200 is easily insufficient, so that the pressure of the air flow pumped by the air pump 200 is insufficient and/or unstable, and meanwhile, wind whistle is easily generated when the air flow flows in the gap.

In this embodiment, the air inlet 210 is opposite to and communicated with the outlet end of the first air passage 50 in the air flow direction of the air inlet 210, so that when the air pump 200 works, under the action of the negative pressure in the air pump 200, the air flow can directly flow into the air inlet 210 of the air pump 200 after flowing out of the outlet end of the first air passage 50, thereby improving the air inlet efficiency, reducing the probability of insufficient air flow pressure and/or unstable air flow pressure output by the air pump 200, and reducing the probability of air flow flowing in the gap between the air pump 200 and the inner wall of the first cavity 11, thereby reducing the probability of generating larger noise when the air pump 200 works, and improving the reliability and the silencing performance of the diagnostic device 1000 in the working process.

In some embodiments of the present utility model, as shown in fig. 15, the outlet end of the first air passage 50 penetrates the circumferential wall of the first cavity 11, and the air inlet 210 is formed on the outer circumferential surface of the air pump 200, the outlet end of the first air passage 50 being opposite to the air inlet 210 in the radial direction of the first cavity 11. Therefore, under the action of the negative pressure in the air pump 200, the air flow can directly enter the air inlet 210 from the first air channel 50, and the probability of the air flow entering the gap between the air pump 200 and the first cavity 11 is smaller, so that the air inlet efficiency is improved, and the probability of generating larger noise between the air pump 200 and the first space gap is reduced.

In some embodiments of the present utility model, as shown in fig. 15, the atmospheric air port 30 is formed at a side of the housing 100, and the atmospheric air port 30, the first air passage 50, and the air inlet 210 are aligned in a horizontal direction. Thus, the process of the air flow entering the first air passage 50 and the air inlet 210 from the air interface 30 is smoother, thereby further improving the air intake efficiency of the air pump 200.

A vehicle 10000 according to an embodiment of the third aspect of the present utility model is described below with reference to fig. 1 to 15.

The vehicle 10000 according to the embodiment of the third aspect of the present utility model includes the above-described diagnostic apparatus 1000 according to the embodiment of the second aspect of the present utility model.

According to the vehicle 10000 of the embodiment of the third aspect of the present utility model, by providing the diagnostic device 1000 according to the embodiment of the second aspect of the present utility model described above, detection of the fuel evaporation leakage condition of the fuel tank 5000 can be achieved, and production cost can be reduced.

In some embodiments of the present utility model, as shown in fig. 6, 8, 10 and 13, the vehicle 10000 further includes: canister 2000, canister 2000 control valve, intake manifold 4000, fuel tank 5000 shutoff valve, and ECU (Electronic Control Unit electronic control unit). Wherein, the carbon tank 2000 is connected among the diagnostic device 1000, the fuel tank 5000 and the intake manifold 4000, the fuel tank 5000 stop valve is connected between the carbon tank 2000 and the fuel tank 5000 for controlling the conduction between the carbon tank 2000 and the fuel tank 5000, the carbon tank 2000 control valve is connected between the intake manifold 4000 and the carbon tank 2000 for controlling the conduction between the intake manifold 4000 and the carbon tank 2000, the intake manifold 4000 is connected with the engine for delivering the gas required by the work to the engine, the ECU is used for controlling the electromagnetic valve 300, the carbon tank 2000 control valve, the fuel tank 5000 stop valve and the air pump 200, and the ECU can record the current in the air pump 200 and compare and analyze.

When canister 2000 is in communication with fuel tank 5000, canister 2000 may absorb fuel vapor evaporated in fuel tank 5000, as shown in fig. 5 and 6, preventing fuel vapor evaporated in fuel tank 5000 from being discharged into the air to pollute the air.

When the canister 2000 and the intake manifold 4000 are in conduction, as shown in fig. 7 and 8, air may pass through the canister 2000 to enter the intake manifold 4000, and at the same time, fuel vapor adsorbed by the canister 2000 may enter the intake manifold 4000 and further enter the engine to participate in combustion, thereby cleaning the canister 2000.

A specific operation of the vehicle 10000 according to the embodiment of the present utility model is described below.

The diagnostic device 1000 is connected to the canister 2000 through the interface of the device to be detected, the working process of the canister 2000 for absorbing fuel vapor is set as an adsorption mode, the working process of the intake manifold 4000 for cleaning the canister 2000 is set as a desorption mode, the working process of the diagnostic device 1000 for measuring the leakage of the reference hole 1612 is set as a learning mode, and the working process of the diagnostic device 1000 for measuring the leakage of the fuel tank 5000 is set as a diagnostic mode.

In the adsorption mode, as shown in fig. 5 and 6, the solenoid valve 300 is in a de-energized state, the valve spool 320 closes the first through hole 1611 in the first position, and the shutoff valve of the fuel tank 5000 is in an open state. The fuel vapor in the fuel tank 5000 firstly passes through the carbon tank 2000, the carbon tank 2000 absorbs the fuel in the fuel vapor, then the rest of gas enters the second cavity 12 through the interface of the equipment to be detected, and then enters the atmosphere interface 30 from the second air passage 60 through the vent hole 330 and the second cavity 12, thereby realizing the conduction between the fuel tank 5000 and the atmosphere, ensuring the stability of the air pressure in the fuel tank 5000, and simultaneously, the evaporated fuel is not discharged into the air to pollute the air.

In the desorption mode, as shown in fig. 7 and 8, the solenoid valve 300 is in the de-energized state, the valve spool 320 blocks the first through hole 1611 in the first position, the canister 2000 control valve is in the open state, and the fuel tank 5000 shutoff valve is in the closed state. At this time, the engine is started, a large negative pressure is generated in the intake manifold 4000 under the intake pressure of the engine, air enters the second cavity 12 from the atmospheric interface 30 through the second air passage 60, and then flows from the device interface 40 to be diagnosed through the vent 330 through the canister 2000 to enter the intake manifold 4000, and in this process, fuel absorbed on the canister 2000 can enter the engine together with the air flow to burn, thereby realizing cleaning of the canister 2000, and enabling the canister 2000 to maintain the adsorption capacity.

In the learn mode, as shown in fig. 9 and 10, the solenoid valve 300 is in the de-energized state, the valve spool 320 blocks the first through hole 1611 in the first position, the canister 2000 control valve is in the closed state, and the fuel tank 5000 shutoff valve is in the closed state. At this time, the air pump 200 is started to generate negative pressure, air enters the air pump 200 from the air interface 30 through the first air channel 50, the air pump 200 is pumped into the air channel 13 after the air pump 200 is pressurized, part of air leaks out from the reference hole 1612, enters the air interface 30 through the vent hole 330 and the second cavity 12, and the ECU records the current in the air pump 200 when the air pressure in the air channel 13 is stable, so that the detection of the leakage amount of the reference hole 1612 is completed.

In diagnostic mode, as shown in fig. 11-13, solenoid valve 300 is in the energized state, valve element 320 is moved to the second position to block vent 330, canister 2000 control valve is in the closed state, and fuel tank 5000 shut-off valve is in the open state. At this time, the air pump 200 is started to generate negative pressure, air enters the air pump 200 from the air interface 30 through the first air channel 50, the air pump 200 is pumped into the air channel 13 after the air pump 200 is pressurized, air flows through the reference hole 1612 and the first through hole 1611 and enters the fuel tank 5000 through the equipment interface 40 to be diagnosed, the air pressure in the fuel tank 5000 is stabilized, the ECU records the current in the air pump 200, and the current in the diagnosis mode and the current in the learning mode are compared and analyzed, so that the detection of the leakage condition of the fuel tank 5000 is completed.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (11)

1. A housing of a diagnostic device for diagnosing evaporative leakage of fuel, the housing comprising:

a main housing having first and second cavities arranged at intervals;

and the cover plate is an independent component and covers one side of the main shell, and the cover plate is matched with the main shell to define a gas channel communicated between the first cavity and the second cavity.

2. The housing of a diagnostic device of claim 1, wherein the cover plate is welded to the main housing.

3. The housing of a diagnostic device according to claim 1, wherein a positioning groove is provided on a side of the main housing facing the cover plate, and the cover plate is provided in the positioning groove and is sealingly connected to a groove wall of the positioning groove.

4. A housing of a diagnostic device according to claim 3, wherein the peripheral edge of the positioning groove is flush with a side surface of the cover plate facing away from the main housing.

5. The housing of a diagnostic device of claim 1, wherein the main housing comprises: the device comprises an outer shell part, a first separation part and a second separation part, wherein the first separation part is arranged on the inner side of the outer shell part, the first separation part is vertically arranged to separate the first cavity from the second cavity, the second separation part is connected to the lower side of the first separation part and horizontally extends, and the cover plate is arranged on the lower side of the second separation part and is matched with the second separation part to define the gas channel.

6. The housing of a diagnostic device of claim 5, wherein the second divider is an upwardly projecting arcuate plate.

7. The housing of a diagnostic device according to claim 5, wherein an end of the second partition facing into the second cavity is provided with a boss protruding into the second cavity, and a first through hole and a reference hole penetrating through the boss are formed in the boss, the first through hole and the reference hole being arranged at a spacing and both communicating between the gas passage and the second cavity.

8. The housing of a diagnostic device of claim 1, wherein the main housing is integrally formed.

9. A diagnostic device, comprising:

the housing of the diagnostic device according to any one of claims 1 to 8, the housing being formed with a first through hole that communicates between the gas passage and the second cavity;

the air pump is arranged in the first cavity and used for pumping air into the air channel;

and the electromagnetic valve is arranged in the second cavity and used for opening and closing the first through hole.

10. The diagnostic apparatus according to claim 9, wherein the solenoid valve includes a valve seat provided in the second cavity and sealingly connected to a peripheral wall of the second cavity, a vent hole penetrating the valve seat being formed in the valve seat, and a valve spool provided on a side of the valve seat facing the gas passage, the valve spool being movable relative to the valve seat between a first position in which the valve spool seals the first through hole and a second position in which the valve spool seals the vent hole,

the device comprises a shell, and is characterized in that an atmosphere interface and a device interface to be diagnosed which are arranged at intervals are formed on the shell, a first air passage and a second air passage are further formed in the shell, the atmosphere interface is communicated with the first cavity through the first air passage, the atmosphere interface is communicated with the second cavity on one side, deviating from the gas passage, of the valve seat through the second air passage, and the device interface to be diagnosed is communicated with the second cavity on one side, facing the gas passage, of the valve seat.

11. A vehicle characterized by comprising the diagnostic device according to claim 9 or 10.