CN116085129A - Leak diagnosis device, leak diagnosis method, engine system, and vehicle - Google Patents

Abstract

The application provides a leakage diagnosis device, a leakage diagnosis method, an engine system and a vehicle. The leak diagnosis device comprises a shell, pumping equipment, a pressure sensor, a baffle plate, a plugging part and a driving part, wherein the pumping equipment, the pressure sensor, the baffle plate, the plugging part and the driving part are positioned in the shell. The shell is provided with a first through hole communicated with the atmosphere and a second through hole communicated with equipment to be diagnosed; the shell is provided with a containing cavity, a main channel and a reference channel; the accommodating cavity is respectively communicated with the main channel and the reference channel, and the exhaust gas quantity of the reference channel is smaller than the maximum allowable leakage quantity of equipment to be diagnosed. The pumping equipment comprises a first air port communicated with the first through hole and a second air port communicated with the accommodating cavity. The pressure sensor is fixedly arranged in the accommodating cavity. The partition board and the shell are enclosed to form a cavity communicated with the second through hole, the reference channel and the main channel; the baffle is equipped with the trompil with first through-hole intercommunication. The driving part is in a first state, the opening is opened, and the blocking part blocks the main channel; the driving part is in a second state, the blocking part blocks the opening, and the main channel is opened.

Description

Leak diagnosis device, leak diagnosis method, engine system, and vehicle

Technical Field

The present disclosure relates to the field of leak diagnosis technologies, and in particular, to a leak diagnosis device, a leak diagnosis method, an engine system, and a vehicle.

Background

With the improvement of living standard, automobiles have become a popular riding tool. When the oil tank of the automobile leaks, gasoline in the oil tank volatilizes into the air, so that atmospheric pollution is caused, the environment is not protected, and therefore whether the oil tank leaks beyond an allowable range needs to be detected.

In one scheme, the leakage amount of the oil tank is calculated through the current change of the air pump pumping air to the oil tank, and whether the leakage amount exceeds the allowable range is judged. However, the calculated fuel tank leakage amount in this scheme is affected by voltage fluctuation and the parking gradient of the vehicle, and the accuracy of the detected fuel tank leakage amount is affected.

Disclosure of Invention

The application provides a leak diagnosis device, a leak diagnosis method, an engine system, and a vehicle.

According to a first aspect of embodiments of the present application, there is provided a leak diagnosis apparatus. The leak diagnosis device includes:

the device comprises a shell, a first sensor and a second sensor, wherein the shell is provided with a first through hole communicated with the atmosphere and a second through hole communicated with equipment to be diagnosed; the shell is provided with a containing cavity, a main channel and a reference channel; the accommodating cavity is respectively communicated with the main channel and the reference channel, and the exhaust gas quantity of the reference channel is smaller than the maximum allowable leakage quantity of the equipment to be diagnosed;

The air pumping device is positioned in the shell and comprises a first air port and a second air port which are communicated, the first air port is communicated with the first through hole, and the second air port is communicated with the accommodating cavity;

the pressure sensor is fixedly arranged in the accommodating cavity;

the partition plate is positioned in the shell, a cavity is formed by enclosing the partition plate and the shell, the reference channel and the main channel are respectively communicated with the cavity, and the cavity is communicated with the second through hole; the partition plate is provided with an opening, and the first through hole is communicated with the cavity through the opening;

the plugging part is positioned in the cavity;

the driving part is positioned in the shell, and the plugging part is connected with the driving part; the driving part is provided with a first state and a second state, in the first state, the driving part drives the plugging part to move in the direction deviating from the opening, the opening is opened, and the plugging part plugs the main channel; in the second state, the driving part drives the blocking part to move towards the opening, the blocking part blocks the opening, and the main channel is opened.

In one embodiment, the drive portion includes a solenoid, a first magnetic member, and a second magnetic member; the electromagnetic coil is fixed in the shell, and the first magnetic piece is fixed in the electromagnetic coil; the second magnetic piece is movably positioned in the electromagnetic coil and is connected with the plugging part; the first magnetic piece and the second magnetic piece are magnetic pieces which can be magnetized in a magnetic field;

When the electromagnetic coil is electrified, the first magnetic piece generates magnetic attraction to the second magnetic piece to drive the second magnetic piece to move, and the second magnetic piece drives the blocking part to move towards the opening; when the electromagnetic coil is powered off, the magnetic attraction of the first magnetic piece to the second magnetic piece disappears, and the second magnetic piece drives the blocking part to move so that the blocking part moves in a direction deviating from the opening;

alternatively, the driving part includes a motor.

In one embodiment, the main channel is located at one side of the opening, which is away from the first magnetic element, and the end of the second magnetic element, which is away from the first magnetic element, penetrates through the opening and enters the cavity; the plugging part comprises a first plugging piece and a second plugging piece, and the first plugging piece is positioned at one side of the second plugging piece, which is away from the opening;

in the first state, the first blocking piece blocks the main channel, and the opening is opened; in the second state, the second blocking piece blocks the opening, and the main channel is opened.

In one embodiment, the leak diagnostic apparatus further comprises a first resilient member located within the chamber; the first elastic piece is located one side of the plugging part, which is away from the opening, one end of the first elastic piece, which is away from the plugging part, is fixed, and the other end of the first elastic piece is propped against the plugging part.

In one embodiment, the aperture of the reference channel ranges from 0.5mm to 0.8mm.

According to a second aspect of the embodiments of the present application, there is provided an engine system including an engine, a fuel tank, and the above leak diagnosis device, the fuel tank being in communication with the second through hole.

According to a third aspect of embodiments of the present application, there is provided a vehicle comprising the engine system described above.

According to a fourth aspect of embodiments of the present application, there is provided a leak diagnosis method, applied to a controller of a leak diagnosis apparatus including a housing provided with a first through hole communicating with the atmosphere and a second through hole communicating with an apparatus to be diagnosed, and a pumping device, a pressure sensor, a diaphragm, a blocking portion, and a driving portion located in the housing; the shell is provided with a containing cavity, a main channel and a reference channel; the accommodating cavity is respectively communicated with the main channel and the reference channel, and the exhaust gas quantity of the reference channel is smaller than the maximum allowable leakage quantity of the leakage diagnosis device; the air pumping equipment comprises a first air port and a second air port which are communicated, the first air port is communicated with the first through hole, and the second air port is communicated with the accommodating cavity; the pressure sensor is fixedly arranged in the accommodating cavity; the partition board and the shell enclose to form a cavity, the reference channel and the main channel are respectively communicated with the second through hole through the cavity, an opening is arranged on the partition board, and the first through hole is communicated with the cavity through the opening; the plugging part is connected with the driving part; the driving part is provided with a first state and a second state, in the first state, the driving part drives the plugging part to move in the direction deviating from the opening, the opening is opened, and the plugging part plugs the main channel; in the second state, the driving part drives the blocking part to move towards the opening, the blocking part blocks the opening, and the main channel is opened;

The leak diagnosis method includes:

controlling the driving part to be in the first state and controlling the pumping equipment to be in a working state so as to pump air to or suck air from the accommodating cavity;

when the pressure value detected by the pressure sensor reaches stability, acquiring a first pressure value detected by the pressure sensor;

controlling the driving part to be in the second state and controlling the pumping equipment to be in the working state;

when the pressure value detected by the pressure sensor reaches stability, acquiring a second pressure value detected by the pressure sensor;

judging whether the leakage amount of the equipment to be diagnosed is larger than the maximum allowable leakage amount according to the first pressure value and the second pressure value.

In one embodiment, the working state of the pumping device is pumping, the relative pressure corresponding to the first pressure value is a first relative pressure, the relative pressure corresponding to the second pressure value is a second relative pressure, and the judging whether the leakage amount of the device to be diagnosed is greater than the maximum allowable leakage amount according to the first pressure value and the second pressure value includes:

If the first relative pressure is higher than the second relative pressure and the difference value between the first relative pressure and the second relative pressure is higher than a first preset threshold value, determining that the leakage amount of the equipment to be diagnosed is higher than the maximum allowable leakage amount;

or the working state of the air pumping equipment is air suction, the vacuum degree corresponding to the first pressure value is a first vacuum degree, and the vacuum degree corresponding to the second pressure value is a second vacuum degree; the judging whether the leakage amount of the equipment to be diagnosed is larger than the maximum allowable leakage amount according to the first pressure value and the second pressure value comprises the following steps:

and if the first vacuum degree is larger than the second vacuum degree and the difference value between the first vacuum degree and the second vacuum degree is larger than a second preset threshold value, determining that the leakage amount of the equipment to be diagnosed is larger than the maximum allowable leakage amount.

In one embodiment, the aperture of the reference channel ranges from 0.5mm to 0.8mm. For example, the aperture of the reference channel is 0.5mm, 0.6mm, 0.7mm, 0.8mm, etc.

According to the leakage diagnosis device, the leakage diagnosis method, the engine system and the vehicle, whether the leakage amount of equipment to be diagnosed is larger than the maximum allowable leakage amount can be determined and judged according to the stable pressure value detected by the pressure sensor when the detection driving part is in the first state and the second state, the pressure value detected by the pressure sensor is hardly influenced by external factors, and the determination result determined according to the pressure value detected by the pressure sensor is higher; the components of the leakage diagnosis device are integrated in the shell, so that the compact arrangement of the components is facilitated, and the occupied volume of the leakage diagnosis device is reduced; the driving part is matched with the pumping equipment to judge whether the leakage amount of the equipment to be diagnosed is larger than the maximum allowable leakage amount, and the leakage diagnosis device has a simple structure and is beneficial to reducing the cost of the leakage diagnosis device; in the leakage diagnosis process, only the driving part is required to be switched between two states, so that whether the leakage amount of the equipment to be diagnosed is larger than the maximum allowable leakage amount can be detected, the operation is relatively simple, and the operation is easy.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.

Fig. 1 is a partial perspective view schematically showing a leak diagnosis apparatus according to an exemplary embodiment of the present application;

FIG. 2 is a cross-sectional view of a housing of a leak diagnostic apparatus provided in an exemplary embodiment of the present application;

FIG. 3 is a cross-sectional view of a leak diagnostic apparatus provided in an exemplary embodiment of the present application in one state;

FIG. 4 is a cross-sectional view of a leak diagnostic apparatus provided in an exemplary embodiment of the present application in another state;

FIG. 5 is a schematic view of a housing and a pressure sensor according to an exemplary embodiment of the present disclosure;

FIG. 6 is a schematic diagram of a pumping device according to an exemplary embodiment of the present disclosure;

fig. 7 is a schematic structural view of a driving part provided in an exemplary embodiment of the present application;

FIG. 8 is a flow chart of a leak diagnostic method provided in an exemplary embodiment of the present application;

fig. 9 is a schematic structural diagram of an engine system according to an exemplary embodiment of the present application.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the accompanying claims.

The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the terms "first," "second," and the like, as used in the specification and the claims herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. Unless otherwise indicated, the terms "front," "rear," "lower," and/or "upper" and the like are merely for convenience of description and are not limited to one location or one spatial orientation. The word "comprising" or "comprises", and the like, means that elements or items appearing before "comprising" or "comprising" are encompassed by the element or item recited after "comprising" or "comprising" and equivalents thereof, and that other elements or items are not excluded.

The leak diagnosis apparatus, the engine system, and the vehicle according to the embodiments of the present application will be described in detail with reference to the accompanying drawings. The features of the examples and embodiments described below may be supplemented or combined with one another without conflict.

The embodiment of the application provides a leakage diagnosis device. As shown in fig. 1 to 4, the leak diagnosis apparatus includes a housing 10, a pumping device 20, a diaphragm 30, a blocking portion 40, a driving portion 50, and a pressure sensor 60.

The housing 10 is provided with a first through hole 11 communicating with the atmosphere and a second through hole 12 for communicating with the device to be diagnosed. The shell 10 is provided with a containing cavity 13, a main channel 14 and a reference channel 15; the accommodating cavity 13 is respectively communicated with the main channel 14 and the reference channel 15, and the exhaust gas quantity of the reference channel 15 is smaller than the maximum allowable leakage quantity of the equipment to be diagnosed.

A pumping device 20 is located in the housing 10, and the pumping device includes a first air port 21 and a second air port 22 that are communicated, where the first air port 21 is communicated with the first through hole 11, and the second air port 22 is communicated with the accommodating cavity 13. The pressure sensor 60 is fixedly arranged in the accommodating cavity 13 and is used for detecting the gas pressure of the accommodating cavity 13.

The partition board 30 is located in the housing 10, the partition board 30 and the housing 10 enclose a chamber 31, the reference channel 15 and the main channel 14 are respectively communicated with the chamber 31, and the chamber 31 is communicated with the second through hole 12. The partition plate 30 is provided with an opening 32, and the first through hole 11 is communicated with the chamber 31 through the opening 32.

The blocking portion 40 is located within the chamber 31. The driving part 50 is located in the housing 10, and the blocking part 40 is connected to the driving part 50. The driving part 50 has a first state and a second state. In the first state, the driving portion 50 drives the blocking portion 40 to move in a direction away from the opening 32, the opening 32 is opened, and the blocking portion 40 blocks the main channel 14, as shown in fig. 4. In the second state, the driving portion 50 drives the blocking portion 40 to move toward the opening 32, the blocking portion 40 blocks the opening 32, and the main channel 14 is opened, as shown in fig. 3.

The leakage diagnosis device provided by the embodiment of the application, the second through hole 12 is communicated with equipment to be diagnosed. When the driving part 50 is in the first state, the working state of the pumping device is pumping, the blocking part 40 blocks the main channel 14, the opening 32 is opened, the gas pumped into the accommodating cavity by the pumping device enters the cavity 31 through the reference channel 15 and flows out of the shell 10 through the first through hole 11, or the working state of the pumping device is pumping, the air in the atmosphere enters the cavity 31 through the first through hole 11, then enters the accommodating cavity 13 through the reference channel 15, and flows out of the shell through the pumping device and the first through hole. The pressure detected by the pressure sensor in the process reaches a first pressure value when it is stable.

When the driving part 50 is in the second state, the working state of the pumping equipment is pumping, the plugging part 40 plugs the opening 32, the main channel 14 is opened, the pumping equipment pumps gas to the accommodating cavity, the gas entering the accommodating cavity enters the cavity 31 through the reference channel 15 and the main channel 14 and enters the equipment to be diagnosed through the second through hole 12, or the working state of the pumping equipment is pumping, the gas in the equipment to be diagnosed enters the cavity through the second through hole and enters the accommodating cavity through the reference channel and the main channel and flows out of the shell through the pumping equipment and the first through hole; the pressure detected by the pressure sensor in the process reaches a second pressure value when it is stable.

And judging whether the leakage amount of the equipment to be diagnosed is larger than the maximum allowable leakage amount according to the first pressure value and the second pressure value.

It can be known that, according to the leak diagnosis device provided in the embodiment of the present application, according to the stable pressure value detected by the pressure sensor when the detection driving portion is in the first state and the second state, it is possible to determine whether the leak amount of the device to be diagnosed is greater than the maximum allowable leak amount, and the pressure value detected by the pressure sensor is hardly affected by an external factor, so that the accuracy of the determination result determined according to the pressure value detected by the pressure sensor is higher; the components of the leakage diagnosis device are integrated in the shell, so that the compact arrangement of the components is facilitated, and the occupied volume of the leakage diagnosis device is reduced; the driving part is matched with the pumping equipment to judge whether the leakage amount of the equipment to be diagnosed is larger than the maximum allowable leakage amount, and the leakage diagnosis device has a simple structure and is beneficial to reducing the cost of the leakage diagnosis device; in the leakage diagnosis process, only the driving part is required to be switched between two states, so that whether the leakage amount of the equipment to be diagnosed is larger than the maximum allowable leakage amount can be detected, the operation is relatively simple, and the operation is easy.

The working states of the pumping device are the same when the driving part 50 is in the first state and the second state, for example, the pumping device charges air into the accommodating cavity when the driving part is in the first state and the second state; or in the first state and the second state, the pumping equipment sucks air from the accommodating cavity.

The characteristics of the pumping equipment can show that when the pumping equipment pumps or pumps air to one cavity, the gas pressure value of the cavity can reach a stable value after a period of time. If the cavity is not leaked, the stable value when the gas pressure value of the cavity reaches the stable value is a fixed value, and the fixed value is related to the characteristics of the pumping equipment. If the cavity is leaked, the stable value of the gas pressure in the cavity is different from the stable value of the cavity without leakage. For example, when the pumping equipment pumps gas into the cavity, the gas pressure of the cavity can reach a stable value of 7kPa; if the cavity has leakage, the stable value reached by the gas pressure in the cavity is less than 7kPa. For example, when the air pumping equipment pumps air from the accommodating cavity, the stable value of the air pressure of the cavity can be reached to be-6 kPa; if the cavity has leakage, the stable value of the gas pressure in the cavity is more than-6 kPa.

Taking the working state of the pumping equipment as an example, the leakage diagnosis device provided by the embodiment of the application is utilized to judge whether the leakage amount of the equipment to be diagnosed is larger than the maximum allowable leakage amount or not, and the process is as follows:

when the driving part 50 is in the first state, the pumping equipment pumps air into the accommodating cavity 13, the accommodating cavity leaks through the reference channel 15, and the pressure value when the accommodating cavity reaches a stable state is a first pressure value; in the second state, the driving part 50 pumps air into the accommodating cavity 13, air in the accommodating cavity enters the cavity 31 through the reference channel 15 and the main channel 14, and enters the equipment to be diagnosed through the second through hole 12, the pressure value when the air pressure in the accommodating cavity reaches a stable value is the second pressure value, at the moment, the air pressure in the accommodating cavity is the same as the air pressure of the equipment to be diagnosed, and the total leakage amount of the leakage diagnosis device and the equipment to be diagnosed is the leakage amount of the equipment to be diagnosed.

If the first pressure value is less than or equal to the second pressure value, determining that the leakage amount of the device to be diagnosed is less than or equal to the leakage amount of the reference channel; since the leakage amount of the reference channel is smaller than the maximum allowable leakage amount of the device to be diagnosed, the leakage amount of the device to be diagnosed is smaller than the maximum allowable leakage amount. If the first pressure value is larger than the second pressure value, the leakage amount of the equipment to be diagnosed is larger than the leakage amount of the reference channel, whether the difference value between the second pressure value and the first pressure value is larger than a first preset threshold value is judged, and if the difference value is larger than the first preset threshold value, the leakage amount of the equipment to be diagnosed is larger than the maximum allowable leakage amount. When the leakage amount of the equipment to be diagnosed is the maximum allowable leakage amount, the first threshold value represents the difference value between the pressure value and the first pressure value when the pressure of the accommodating cavity reaches a stable state in the second state of the driving part.

In the embodiment of the application, the exhaust gas quantity (leakage quantity) of the reference channel is set to be smaller than the maximum allowable leakage quantity of the equipment to be diagnosed, so that the accuracy of leakage diagnosis is improved; in addition, the equipment to be diagnosed can be used for different equipment to be diagnosed, so that the application range of the leakage diagnosis device is wider.

Further, in order to improve the accuracy of the leakage judgment of the device to be diagnosed, the driving part is prevented from affecting the accuracy of the leakage judgment of the device to be diagnosed in the first state and the second state due to different atmospheric pressure, and whether the leakage amount of the device to be diagnosed is larger than the maximum allowable leakage amount can be judged according to the first relative pressure corresponding to the first pressure value and the second relative pressure corresponding to the second pressure value. Therefore, the judging structure is more accurate. The first relative pressure corresponding to the first pressure value refers to a value of the relative pressure obtained through conversion according to the first pressure value, and the second relative pressure corresponding to the second pressure value refers to a value of the relative pressure obtained through conversion according to the second pressure value.

In one embodiment, as shown in fig. 3 to 5, the device to be diagnosed further includes a housing shell 16 fixed in the housing 10, and a cavity in the housing shell 16 is the housing cavity 13. The pressure sensor 60 is fixedly disposed within the housing 16.

In one embodiment, the housing shell 16 is provided with a first opening 131 and a second opening 132, the first opening 131 communicates with the second air port 22, and the second air port 22 communicates with the housing cavity 13 through the first opening 131. The receiving chamber 13 communicates with the main channel 14 and the reference channel 15 through a second opening 132.

In one embodiment, a communication channel 17 is further provided in the housing, one end of the communication channel 17 is communicated with the accommodating cavity 13, and the other end is respectively communicated with the main channel 14 and the reference channel 15. Specifically, the housing chamber 13 communicates with the communication passage 17 through the second opening 132.

In one embodiment, the reference passage 15 has a flow area that is smaller than the flow area of the main passage 14. By the arrangement, the leakage amount of the reference channel 15 can be ensured to be smaller than the maximum allowable leakage amount of the equipment to be diagnosed, and the flow area of the main channel 14 can be ensured to be larger, so that the gas flow of the gas passing through the main channel 14 is larger when the driving part is in the second state, and the air pressure in the equipment to be diagnosed and the accommodating cavity can be balanced relatively quickly.

In one embodiment, the aperture of the reference channel ranges from 0.5mm to 0.8mm. When the equipment to be diagnosed is an oil tank of a vehicle, the maximum allowable leakage amount of the oil tank is equivalent to the leakage amount of a hole with the aperture of 1.0mm, the aperture range of the reference channel is set to be 0.5-0.8 mm, the exhaust amount of the reference channel can be ensured to be smaller than the maximum allowable leakage amount of the equipment to be diagnosed, meanwhile, the aperture of the reference channel can be prevented from being too small, the exhaust amount of the reference channel is larger than the maximum allowable leakage amount of the equipment to be diagnosed, and the leakage amount of the reference channel cannot be effectively used as a reference for judging the leakage amount of the equipment to be diagnosed.

In one embodiment, as shown in fig. 6, the pumping device 20 includes a first electrode 203 and a second electrode 204. When the first electrode 203 is connected with the positive electrode of the power supply and the second electrode 204 is connected with the negative electrode of the power supply, the pumping equipment 20 pumps air to the equipment to be diagnosed; the first electrode 203 is connected to the negative electrode of the power supply, and the second electrode 204 is connected to the positive electrode of the power supply, so that the pumping device 20 sucks air from the device to be diagnosed.

In one embodiment, as shown in fig. 7, the driving part 50 includes an electromagnetic coil 51, a first magnetic member 52, and a second magnetic member 53. The electromagnetic coil 51 is fixed in the housing 10, and the first magnetic member 52 is fixed in the electromagnetic coil 51. The second magnetic member 53 is movably disposed within the electromagnetic coil 51 and is connected to the blocking portion 40. The first magnetic member 52 and the second magnetic member 53 are magnetic members that can be magnetized in a magnetic field. When the electromagnetic coil 51 is electrified, the first magnetic piece 52 generates magnetic attraction to the second magnetic piece 53 to drive the second magnetic piece 53 to move, and the second magnetic piece 53 drives the plugging portion 40 to move towards the opening 32; when the electromagnetic coil 51 is powered off, the magnetic attraction of the first magnetic piece 52 to the second magnetic piece 53 disappears, and the second magnetic piece 53 drives the blocking portion 40 to move, so that the blocking portion moves in a direction away from the opening.

By controlling the energization and the de-energization of the electromagnetic coil 51 in this manner, the switching of the two states of the driving section 50 can be controlled, and the operation is easy.

In some embodiments, the material of the first magnetic member 52 and the second magnetic member 53 may be metallic iron.

In some embodiments, the driving part 50 further includes a second elastic member 54, wherein one end of the second elastic member 54 is connected to the first magnetic member 52, and the other end is connected to the second magnetic member 53. When the electromagnetic coil 51 is energized, the second magnetic member 53 moves in a direction approaching the first magnetic member 52, and the second elastic member 54 is compressed; when the electromagnetic coil 51 is de-energized, the magnetic attraction of the first magnetic member 52 to the first magnetic member 52 disappears, the second elastic member 54 stretches, and the electromagnetic coil 51 moves in a direction away from the first magnetic member 52. After the electromagnetic coil 51 is powered off, the second elastic member 54 provides a downward moving force for the second magnetic member 53, so that the situation that the second magnetic member 53 is blocked and cannot move downward after the electromagnetic coil 51 is powered off can be avoided. In some exemplary embodiments, the second resilient member 54 is a spring.

Further, the blocking portion 40 is located in the cavity 31 and below the opening 32, the second magnetic member 53 is located below the first magnetic member 52, the cavity 31 is located below the first magnetic member 52, and the lower end of the second magnetic member 53 penetrates through the opening 32 to enter the cavity 31 and is connected to the blocking portion 40. Wherein, the flow area of the opening 32 is larger than the cross section of the portion of the second magnetic member 53 passing through the opening 32, and a gap exists between the portion of the second magnetic member 53 passing through the opening 32 and the wall of the opening 32, and when the opening 32 is not blocked by the blocking portion 40, the gas can pass through the gap between the second magnetic member 53 and the opening 32. The second magnetic member 53 may have a rod shape.

In one embodiment, the end of the main channel 14 communicating with the chamber 31 is located on the side of the opening 32 facing away from the first magnetic member 52, and the end of the second magnetic member 53 facing away from the first magnetic member 52 penetrates the opening 32 into the chamber 31. The blocking portion 40 includes a first blocking member 41 and a second blocking member 42, where the first blocking member 41 and the second blocking member 42 are connected to a portion of the second magnetic member 53 located in the chamber 31, and the first blocking member 41 is located on a side of the second blocking member 42 facing away from the opening 32. In the first state, the first blocking member 41 blocks the main passage 14, and the opening 32 is opened; in the second state, the second blocking member 42 blocks the opening 32 and the main passage 14 is opened.

In some embodiments, as shown in fig. 3 and 4, the leak diagnostic apparatus 100 further includes a first resilient member 70 positioned within the chamber 31; the first elastic member 70 is located at a side of the plugging portion 40 away from the opening 32, one end of the first elastic member 70 away from the plugging portion 40 is fixed, and the other end abuts against the plugging portion 40. One end of the first elastic member 70 may be coupled to the inner wall of the housing 10 so as to be fixed in the chamber 31. When the electromagnetic coil 51 is powered off, the second magnetic piece 53 moves in a direction away from the first magnetic piece 52, the second magnetic piece 53 drives the plugging part 40 to move downwards, and the first elastic piece 70 is compressed; when the electromagnetic coil 51 is energized, the second magnetic member 53 moves in a direction approaching the first magnetic member 52, and the first elastic member 70 stretches to push the blocking portion 40 and the second magnetic member 53 to move in a direction approaching the first magnetic member 52, so that the blocking portion 40 cannot block the opening 32 due to the fact that the second magnetic member 53 cannot move smoothly in a direction approaching the first magnetic member 52 can be avoided. In some exemplary embodiments, the first resilient member 70 is a spring.

Further, the first elastic member 70 surrounds an opening of the main passage 14 communicating with the chamber 31.

In another embodiment, the driving part 50 includes a motor, the motor can drive the plugging part 40 to move, the motor has two working states, in the first working state, the motor drives the plugging part 40 to move in a direction away from the opening 32, so that the opening 32 is opened, and the plugging part 40 plugs the main channel 14; in the second state, the motor drives the blocking portion 40 to move in a direction approaching the opening 32, so that the blocking portion 40 blocks the opening 32, and the main channel 14 is opened. Opening or blocking of the opening 32 and the blocking portion can be achieved by controlling the working state of the motor, and operation is facilitated.

In one embodiment, the leak diagnostic apparatus 100 further includes an air filter disposed at the first through hole. So set up, the air in the atmosphere passes through air cleaner earlier, and then enters into pumping equipment 20 and cavity 31, and air cleaner can be with the impurity filtering in the air, guarantees that the impurity in the air that enters into the equipment of waiting to diagnose is less. In some exemplary embodiments, the air filter is a dust filter that filters dust from the air.

In one embodiment, the leak diagnosis apparatus provided herein is provided with a plug, through which both the driving part 50 and the pumping device 20 are electrically connected to an external power source. In some embodiments, the plug is provided with a plurality of pins, two of which are electrically connected to the drive portion and the other two of which are electrically connected to the pumping device.

In one embodiment, the leak diagnosis apparatus further includes a controller for determining whether the leak amount of the device to be diagnosed is greater than a maximum allowable leak amount based on the first pressure value and the second pressure value.

The embodiment of the application also provides a leakage diagnosis method which is applied to the controller of the leakage diagnosis device, wherein the leakage diagnosis device is the leakage diagnosis device in any embodiment. As shown in fig. 8, the leak diagnosis method includes the following steps 110 to 150.

In step 110, the driving part is controlled to be in the first state, and the pumping device is controlled to be in a working state, so that the pumping device pumps air into or pumps air from the accommodating cavity.

In step 120, when the pressure value detected by the pressure sensor reaches a stable value, a first pressure value detected by the pressure sensor is acquired.

In step 130, the driving part is controlled to be in the second state, and the pumping device is controlled to be in the working state.

In step 140, when the pressure value detected by the pressure sensor reaches a stable value, a second pressure value detected by the pressure sensor is acquired.

In step 150, it is determined whether the leakage amount of the device to be diagnosed is greater than the maximum allowable leakage amount according to the first pressure value and the second pressure value.

In step 110 and step 130, the pumping devices are in the same working state, and are in the pumping working state or in the pumping working state.

In some embodiments, steps 110 and 120 may be performed first, steps 130 and 140 may be performed after step 120, and step 150 may be performed last. In other embodiments, steps 130 and 140 may be performed first, steps 110 and 120 may be performed after step 140, and step 150 may be performed finally.

In some embodiments, the working state of the pumping device is pumping, the relative pressure corresponding to the first pressure value is a first relative pressure, and the relative pressure corresponding to the second pressure value is a second relative pressure; the step 150 of determining whether the leakage amount of the device to be diagnosed is greater than the maximum allowable leakage amount according to the first pressure value and the second pressure value includes the following procedures:

if the first relative pressure is higher than the second relative pressure and the difference value between the first relative pressure and the second relative pressure is higher than a first preset threshold value, determining that the leakage amount of the equipment to be diagnosed is higher than the maximum allowable leakage amount; if the first relative pressure is higher than the second relative pressure and the difference value between the first relative pressure and the second relative pressure is lower than or equal to the first preset threshold value, determining that the leakage amount of the equipment to be diagnosed is lower than or equal to the maximum allowable leakage amount; and if the first relative pressure is smaller than or equal to the second relative pressure, determining that the leakage amount of the equipment to be diagnosed is smaller than the maximum allowable leakage amount.

Wherein, if the first pressure value and the second pressure value detected by the pressure sensor are absolute pressures, the leak diagnosis method further includes, before step 150: acquiring a first atmospheric pressure of the atmosphere when the driving part is controlled to be in the first state; acquiring a second atmospheric pressure of the atmosphere when the driving part is controlled to be in the second state; and determining a first relative pressure corresponding to the first pressure value according to the first pressure value and the first atmospheric pressure, and determining a second relative pressure corresponding to the second pressure value according to the second pressure value and the second atmospheric pressure. The first pressure value is subtracted from the first atmospheric pressure to obtain a first relative pressure, and the second pressure value is subtracted from the second atmospheric pressure to obtain a second relative pressure.

If the pressure value detected by the pressure sensor is the relative pressure, the first pressure value is the corresponding first relative pressure, and the second pressure value is the corresponding second relative pressure.

The first pressure value and the second pressure value are both positive numbers in the pumping state of the pumping device. Since the first pressure value and the second pressure value are detected at different points in time, the atmospheric pressure at different points in time may be different, and the position of the vehicle may change at different points in time, and the atmospheric pressure at different positions may also be different. By determining the first relative pressure and the second relative pressure, whether the leakage amount of the equipment to be diagnosed is larger than the maximum allowable leakage amount or not is judged according to the first relative pressure and the second relative pressure, and the judgment result is more accurate and the precision is higher.

The first preset threshold represents the difference between the relative pressure of the storage cavity when the pressure of the driving part reaches the stable state and the first relative pressure when the pressure of the storage cavity reaches the stable state when the leakage amount of the equipment to be diagnosed is the maximum allowable leakage amount under the pumping state of the pumping equipment. It should be noted that the first preset threshold may be equal to the difference, or may be different from the difference in a smaller range.

In the pumping state of the pumping equipment, when the driving part is in the first state, the leakage amount of the leakage diagnosis device is the leakage amount of the reference channel; when the driving section is in the second state, the total leakage amount of the leakage diagnosis device and the apparatus to be diagnosed is the leakage amount of the apparatus to be diagnosed. The larger the leakage amount is, the smaller the pressure value is when the pressure of the housing chamber is stabilized, and the smaller the relative pressure is, regardless of whether the driving portion is in the first state or the second state.

When the first relative pressure is smaller than or equal to the second relative pressure, the leakage amount of the device to be diagnosed is smaller than or equal to the leakage amount of the reference channel, and the leakage amount of the device to be diagnosed is smaller than the maximum allowable leakage amount because the leakage amount of the reference channel is smaller than the maximum allowable leakage amount. And if the first relative pressure is larger than the second relative pressure, indicating that the leakage amount of the equipment to be diagnosed is larger than the leakage amount of the reference channel, continuing to judge whether the difference value between the first relative pressure and the second relative pressure is larger than a first preset threshold value. When the difference between the first relative pressure and the second relative pressure is larger than a first preset threshold, the difference between the leakage amount of the equipment to be diagnosed and the leakage amount of the reference channel is larger than the difference between the maximum allowable leakage amount and the leakage amount of the reference channel, namely the leakage amount of the equipment to be diagnosed is larger than the maximum allowable leakage amount.

In another embodiment, the working state of the pumping device is pumping, the vacuum degree corresponding to the first pressure value is a first vacuum degree, and the vacuum degree corresponding to the second pressure value is a second vacuum degree; the step 150 of determining whether the leakage amount of the device to be diagnosed is greater than the maximum allowable leakage amount according to the first pressure value and the second pressure value includes the following procedures:

if the first vacuum degree is smaller than or equal to the second vacuum degree, determining that the leakage amount of the equipment to be diagnosed is smaller than the maximum allowable leakage amount; if the first vacuum degree is larger than the second vacuum degree and the difference value between the first vacuum degree and the second vacuum degree is larger than a second preset threshold value, determining that the leakage amount of the equipment to be diagnosed is larger than the maximum allowable leakage amount; and if the first vacuum degree is smaller than the second vacuum degree and the difference value between the first vacuum degree and the second vacuum degree is smaller than or equal to the second preset threshold value, determining that the leakage amount of the equipment to be diagnosed is smaller than or equal to the maximum allowable leakage amount.

Wherein, if the first pressure value and the second pressure value detected by the pressure sensor are absolute pressures, the leak diagnosis method further includes, before step 150: acquiring a first atmospheric pressure of the atmosphere when the driving part is controlled to be in the first state; acquiring a second atmospheric pressure of the atmosphere when the driving part is controlled to be in the second state; and determining a first vacuum degree corresponding to the first pressure value according to the first pressure value and the first atmospheric pressure, and determining a vacuum degree corresponding to the second pressure value according to the second pressure value and the second atmospheric pressure. The first atmospheric pressure is subtracted from the first pressure value to obtain a first vacuum degree, and the second atmospheric pressure is subtracted from the second pressure value to obtain a second vacuum degree.

If the pressure sensor is a vacuum gauge, the detected pressure value is the vacuum degree, the first pressure value is the corresponding first vacuum degree, and the second pressure value is the corresponding second vacuum degree.

The first pressure value and the second pressure value are negative numbers when the air pumping equipment is in an air pumping state. Since the first pressure value and the second pressure value are detected at different times, the atmospheric pressure may be different at different points in time, and the position of the vehicle may be changed, and the atmospheric pressure may be different at different positions. The first vacuum degree and the second vacuum degree are determined by detecting the first atmospheric pressure and the second atmospheric pressure, whether the leakage amount of the equipment to be diagnosed is larger than the maximum allowable leakage amount or not is judged according to the first vacuum degree and the second vacuum degree, the judgment result is more accurate, and the precision is higher.

The second preset threshold represents the difference between the vacuum degree and the first vacuum degree when the pressure of the accommodating cavity reaches a stable state when the driving part is in the second state when the leakage amount of the equipment to be diagnosed is the maximum allowable leakage amount under the air extraction state of the air pumping equipment. It should be noted that the second preset threshold may be equal to the difference, or may be different from the difference in a smaller range.

In the pumping state of the pumping equipment, when the driving part is in the first state, the leakage amount of the leakage diagnosis device is the leakage amount of the reference channel; when the driving section is in the second state, the total leakage amount of the leakage diagnosis device and the apparatus to be diagnosed is the leakage amount of the apparatus to be diagnosed. The larger the leakage amount is, the larger the pressure value is when the pressure of the housing chamber is stabilized, and the smaller the vacuum degree is, regardless of whether the driving portion is in the first state or the second state.

When the first vacuum degree is smaller than or equal to the second vacuum degree, the leakage amount of the equipment to be diagnosed is smaller than or equal to the leakage amount of the reference channel, and the leakage amount of the equipment to be diagnosed is smaller than the maximum allowable leakage amount because the leakage amount of the reference channel is smaller than the maximum allowable leakage amount. When the first vacuum degree is larger than the second vacuum degree, the leakage amount of the equipment to be diagnosed is larger than the leakage amount of the reference channel, and whether the difference value between the first vacuum degree and the second vacuum degree is larger than a second preset threshold value is needed to be continuously judged. And if the difference between the first vacuum degree and the second vacuum degree is larger than a second preset threshold value, indicating that the difference between the leakage amount of the equipment to be diagnosed and the leakage amount of the reference channel is larger than the difference between the maximum allowable leakage amount and the leakage amount of the reference channel, namely that the leakage amount of the equipment to be diagnosed is larger than the maximum allowable leakage amount.

In one embodiment, the aperture of the reference channel ranges from 0.5mm to 0.8mm.

The embodiment of the application also provides an engine system. Referring to fig. 9, the engine system includes an engine 84, a fuel tank 81, and the leak diagnosis device 100 according to any of the above embodiments, the fuel tank 81 communicates with the second through hole of the housing, and the fuel tank 81 communicates with the intake manifold of the engine 84.

In the engine system provided by the embodiment of the application, when diagnosing whether the leakage amount of the oil tank is greater than the maximum allowable leakage amount, the driving part 50 is controlled to be in the first state, the pumping equipment 20 pumps air into or sucks air from the accommodating cavity, and when the pressure value detected by the pressure sensor reaches a stable value, the first pressure value detected by the pressure sensor is obtained; subsequently, the driving part 50 is controlled to be in a second state, the pumping equipment 20 pumps air into or sucks air from the accommodating cavity, and when the pressure value detected by the pressure sensor reaches a stable value, the second pressure value detected by the pressure sensor is obtained; and judging whether the leakage amount of the oil tank is larger than the maximum allowable leakage amount according to the first pressure value and the second pressure value.

In one embodiment, the fuel tank 81 is directly connected to the intake manifold of the engine 84, the engine system further comprises a check valve 86 connected between the fuel tank 81 and the engine 84, an inlet of the check valve 86 is connected to the fuel tank 81, an outlet of the check valve 86 is connected to the intake manifold of the engine 84, and fuel vapor in the fuel tank 81 can enter the engine 84 through the check valve 86. The check valve 86 is provided to prevent the fuel vapor from flowing back to the fuel tank 81.

In one embodiment, the engine system further comprises a carbon canister 82, the carbon canister 82 being connected between the second through hole of the housing and the oil tank 81, the oil tank 81 being in communication with the second through hole through the carbon canister 82. Through setting up carbon tank 82, when the engine is flameout, the petrol steam in the oil tank 81 enters into carbon tank 82, and the active carbon in the carbon tank 82 adsorbs the fuel steam, so can prevent that petrol steam from entering into the atmosphere, reaches the purpose of saving fuel and environmental protection. When the engine starts, fuel vapor stored in canister 82 enters the intake manifold of the engine.

In one embodiment, referring to FIG. 3, the engine system further includes a canister purge valve 87, the canister purge valve 87 being connected between the canister 82 and the intake manifold of the engine 84. The canister purge valve 87 communicates the canister 82 with the engine 84 when the engine 84 is started, and gas in the canister 82 enters the engine 84 through the canister purge valve 87; when the leak diagnosis is performed, the canister purge valve 87 is closed, the engine 84 is not in communication with the canister 82, and the leak diagnosis device 100 detects whether the leak amount of the tank 81 is greater than the maximum allowable leak amount.

In one embodiment, the engine system further includes a throttle valve 88, the inlet of the throttle valve 88 being in communication with the atmosphere and the outlet being in communication with the intake manifold of the engine. Throttle 88 may control the amount of air entering engine 84.

In one embodiment, the engine system further includes an exhaust system 85, wherein the exhaust system 85 is configured to exhaust gases emitted during operation of the engine 84, and wherein exhaust gas pollution is reduced and exhaust noise is reduced.

The embodiment of the application also provides a vehicle comprising the engine system.

The foregoing description is only a preferred embodiment of the present application, and is not intended to limit the invention to the particular embodiment disclosed, but is not intended to limit the invention to the particular embodiment disclosed, as the equivalent of some alterations or modifications can be made without departing from the scope of the present application.

The disclosure of this patent document contains material which is subject to copyright protection. The copyright is owned by the copyright owner. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the patent and trademark office patent files or records.

Claims (10)

1. A leak diagnosis apparatus, characterized by comprising:

a housing (10) provided with a first through hole (11) communicating with the atmosphere and a second through hole (12) for communicating with the apparatus to be diagnosed; the shell is provided with a containing cavity (13), a main channel (14) and a reference channel (15); the accommodating cavity is respectively communicated with the main channel and the reference channel, and the exhaust gas quantity of the reference channel is smaller than the maximum allowable leakage quantity of the equipment to be diagnosed;

the pumping equipment (20) is positioned in the shell (10) and comprises a first air port (21) and a second air port (22) which are communicated, wherein the first air port is communicated with the first through hole, and the second air port is communicated with the accommodating cavity;

a pressure sensor (60) fixedly arranged in the accommodating cavity;

the partition board (30) is positioned in the shell, the partition board (30) and the shell enclose to form a cavity (31), the reference channel and the main channel are respectively communicated with the cavity (31), and the cavity is communicated with the second through hole; an opening (32) is formed in the partition plate (30), and the first through hole is communicated with the cavity through the opening;

a closure (40) located within the chamber;

A driving part (50) positioned in the shell, wherein the plugging part is connected with the driving part; the driving part is provided with a first state and a second state, in the first state, the driving part drives the plugging part to move in the direction deviating from the opening, the opening is opened, and the plugging part plugs the main channel; in the second state, the driving part drives the blocking part to move towards the opening, the blocking part blocks the opening, and the main channel is opened.

2. The leak diagnosis apparatus according to claim 1, wherein the driving portion (50) includes an electromagnetic coil (51), a first magnetic member (52), and a second magnetic member (53); the electromagnetic coil is fixed in the shell, and the first magnetic piece is fixed in the electromagnetic coil; the second magnetic piece is movably positioned in the electromagnetic coil and is connected with the plugging part; the first magnetic piece and the second magnetic piece are magnetic pieces which can be magnetized in a magnetic field;

when the electromagnetic coil is electrified, the first magnetic piece generates magnetic attraction to the second magnetic piece to drive the second magnetic piece to move, and the second magnetic piece drives the blocking part to move towards the opening; when the electromagnetic coil is powered off, the magnetic attraction of the first magnetic piece to the second magnetic piece disappears, and the second magnetic piece drives the blocking part to move so that the blocking part moves in a direction deviating from the opening;

Alternatively, the driving part includes a motor.

3. A leak diagnostic apparatus as defined in claim 2, wherein the main passage is located on a side of the aperture facing away from the first magnetic member, an end of the second magnetic member (53) facing away from the first magnetic member passing through the aperture (32) into the chamber; the plugging part comprises a first plugging piece and a second plugging piece, and the first plugging piece is positioned at one side of the second plugging piece, which is away from the opening;

in the first state, the first blocking piece blocks the main channel, and the opening is opened; in the second state, the second blocking piece blocks the opening, and the main channel is opened.

4. A leak diagnostic apparatus as set forth in claim 2, further comprising a first resilient member (70) located within the chamber (31); the first elastic piece is located one side of the plugging part, which is away from the opening, one end of the first elastic piece, which is away from the plugging part, is fixed, and the other end of the first elastic piece is propped against the plugging part.

5. The leak diagnostic apparatus of claim 1 wherein the reference channel has a pore size in the range of 0.5mm to 0.8mm.

6. An engine system comprising an engine, a fuel tank, and the leak diagnosis apparatus according to any one of claims 1 to 5, the fuel tank being in communication with the second through hole.

7. A vehicle comprising the engine system of claim 6.

8. The leakage diagnosis method is applied to a controller of the leakage diagnosis device and is characterized by further comprising a shell, pumping equipment, a pressure sensor, a baffle plate, a plugging part and a driving part, wherein the pumping equipment, the pressure sensor, the baffle plate, the plugging part and the driving part are positioned in the shell; the shell is provided with a containing cavity, a main channel and a reference channel; the accommodating cavity is respectively communicated with the main channel and the reference channel, and the exhaust gas quantity of the reference channel is smaller than the maximum allowable leakage quantity of the leakage diagnosis device; the air pumping equipment comprises a first air port and a second air port which are communicated, the first air port is communicated with the first through hole, and the second air port is communicated with the accommodating cavity; the pressure sensor is fixedly arranged in the accommodating cavity; the partition board and the shell enclose to form a cavity, the reference channel and the main channel are respectively communicated with the second through hole through the cavity, an opening is arranged on the partition board, and the first through hole is communicated with the cavity through the opening; the plugging part is connected with the driving part; the driving part is provided with a first state and a second state, in the first state, the driving part drives the plugging part to move in the direction deviating from the opening, the opening is opened, and the plugging part plugs the main channel; in the second state, the driving part drives the blocking part to move towards the opening, the blocking part blocks the opening, and the main channel is opened;

The leak diagnosis method includes:

controlling the driving part to be in the first state and controlling the pumping equipment to be in a working state so as to pump air to or suck air from the accommodating cavity;

when the pressure value detected by the pressure sensor reaches stability, acquiring a first pressure value detected by the pressure sensor;

controlling the driving part to be in the second state and controlling the pumping equipment to be in the working state;

when the pressure value detected by the pressure sensor reaches stability, acquiring a second pressure value detected by the pressure sensor;

judging whether the leakage amount of the equipment to be diagnosed is larger than the maximum allowable leakage amount according to the first pressure value and the second pressure value.

9. The leak diagnosis method according to claim 8, wherein the operation state of the pumping device is pumping, the relative pressure corresponding to the first pressure value is a first relative pressure, the relative pressure corresponding to the second pressure value is a second relative pressure, and the judging whether the leak amount of the device to be diagnosed is greater than the maximum allowable leak amount according to the first pressure value and the second pressure value includes:

If the first relative pressure is higher than the second relative pressure and the difference value between the first relative pressure and the second relative pressure is higher than a first preset threshold value, determining that the leakage amount of the equipment to be diagnosed is higher than the maximum allowable leakage amount;

or the working state of the air pumping equipment is air suction, the vacuum degree corresponding to the first pressure value is a first vacuum degree, and the vacuum degree corresponding to the second pressure value is a second vacuum degree; the judging whether the leakage amount of the equipment to be diagnosed is larger than the maximum allowable leakage amount according to the first pressure value and the second pressure value comprises the following steps:

and if the first vacuum degree is larger than the second vacuum degree and the difference value between the first vacuum degree and the second vacuum degree is larger than a second preset threshold value, determining that the leakage amount of the equipment to be diagnosed is larger than the maximum allowable leakage amount.

10. The leak diagnostic method of claim 8 wherein the reference channel has a pore size in the range of 0.5mm to 0.8mm.

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