CN216381628U - Leak diagnosis device, engine system, and vehicle - Google Patents

Abstract

The application provides a leakage diagnosis device, an engine system and a vehicle. The leakage diagnosis device comprises a shell, and pumping equipment, a pressure sensor, a partition plate, a blocking part and a driving part which 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 the equipment to be diagnosed; the shell is provided with an accommodating cavity, a main channel and a reference channel; the containing cavity is respectively communicated with the main channel and the reference channel, and the exhaust volume of the reference channel is less than the maximum allowable leakage volume of the 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 containing cavity. The pressure sensor is fixedly arranged in the accommodating cavity. The partition plate and the shell are enclosed to form a cavity communicated with the second through hole, the reference channel and the main channel; the partition board is provided with an opening communicated with the first through hole. The driving part is in a first state, the opening is opened, and the main channel is blocked by the blocking part; the driving part is in the second state, and the trompil shutoff will be opened to the shutoff portion, and the main entrance is opened.

Description

Leak diagnosis device, engine system, and vehicle

Technical Field

The present application relates to the field of leak diagnosis technology, and in particular, to a leak diagnosis apparatus, an engine system, and a vehicle.

Background

With the improvement of living standard, automobiles become a common transportation tool. When the oil tank of car is leaking, the petrol in the oil tank volatilizes in the air, causes atmospheric pollution, is unfavorable for the environmental protection, therefore whether need detect the oil tank and take place the leakage that surpasss the allowed band.

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

SUMMERY OF THE UTILITY MODEL

The application provides a leakage diagnosis device, 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 diagnosis device comprises a shell, a first detection unit and a second detection unit, wherein the shell is provided with a first through hole communicated with the atmosphere and a second through hole used for being communicated with a device to be diagnosed; the shell is provided with an accommodating 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 volume of the reference channel is less than the maximum allowable leakage volume of the equipment to be diagnosed;

the air pumping equipment 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, the partition plate and the shell are enclosed to form a cavity, 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;

a blocking portion located within the chamber;

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

In one embodiment, the driving part includes an electromagnetic coil, 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 blocking part; the first magnetic part and the second magnetic part are magnetic parts which can be magnetized in a magnetic field;

when the electromagnetic coil is electrified, the first magnetic piece generates magnetic attraction force on 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 plugging part to move so that the plugging part moves in a direction away from the hole;

alternatively, the driving part includes a motor.

In one embodiment, the main channel is positioned on one side of the opening, which faces away from the first magnetic part, and the end of the second magnetic part, which faces away from the first magnetic part, penetrates through the opening and enters the chamber; the blocking part comprises a first blocking piece and a second blocking piece, and the first blocking piece is positioned on one side, away from the opening, of the second blocking piece;

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 open hole, 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 blocking portion, which deviates from the opening, one end of the first elastic piece, which deviates from the blocking portion, is fixed, and the other end of the first elastic piece is abutted to the blocking portion.

In one embodiment, the driving part further comprises a second elastic member; one end of the second elastic piece is connected with the first magnetic piece, and the other end of the second elastic piece is abutted against the second magnetic piece.

In one embodiment, the reference channel has an aperture in the range of 0.5mm to 0.8 mm.

In one embodiment, the flow area of the primary channel is larger than the flow area of the reference channel.

In one embodiment, the leak diagnosis apparatus further includes an air filter provided at the first through hole.

According to a second aspect of the embodiments of the present application, there is provided an engine system including an engine, an oil tank communicating with the second through hole, and the above-described leakage diagnosis device.

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

According to the leakage diagnosis device, the engine system and the vehicle provided by the embodiment of the application, whether the leakage amount of the equipment to be diagnosed is larger than the maximum allowable leakage amount or not can be determined and judged according to the stable pressure values 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 judgment result determined according to the pressure value detected by the pressure sensor is higher; all elements of the leakage diagnosis device are integrated in the shell, so that the compact arrangement of all elements is facilitated, and the occupied volume of the leakage diagnosis device is reduced; whether the leakage amount of the equipment to be diagnosed is larger than the maximum allowable leakage amount or not can be judged by matching the driving part with the air pumping equipment, and the leakage diagnosing device is simple in structure and contributes to reducing the cost of the leakage diagnosing device; in the process of leakage diagnosis, whether the leakage amount of the equipment to be diagnosed is larger than the maximum allowable leakage amount can be detected only by switching the two states of the driving part, and the operation is simple and 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 present application and together with the description, serve to explain the principles of the application.

Fig. 1 is a partial perspective view of 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 structural diagram of a housing case and a pressure sensor according to an exemplary embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of an air pumping apparatus provided in an exemplary embodiment of the present application;

fig. 7 is a schematic structural diagram of a driving portion according to an exemplary embodiment of the present application;

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

FIG. 9 is a schematic block diagram of an engine system provided in accordance with an exemplary embodiment of the present application.

Detailed Description

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

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the 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 description and in the claims, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of 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, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items.

The leak diagnosis device, the engine system, and the vehicle according to the embodiment of the present application will be described in detail below with reference to the drawings. The features of the following examples and embodiments can be supplemented or combined with each other 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 partition plate 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 a device to be diagnosed. The shell 10 is provided with an accommodating cavity 13, a main channel 14 and a reference channel 15; the containing cavity 13 is respectively communicated with the main channel 14 and the reference channel 15, and the exhaust volume of the reference channel 15 is less than the maximum allowable leakage volume of the equipment to be diagnosed.

The pumping device 20 is located in the housing 10, and includes a first air port 21 and a second air port 22 which are communicated, 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 disposed in the housing chamber 13, and is configured to detect a gas pressure in the housing chamber 13.

The partition plate 30 is located in the housing 10, the partition plate 30 and the housing 10 enclose to form 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. An opening 32 is formed in the partition plate 30, 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 with 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 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.

In the leak diagnosis apparatus provided in the embodiment of the present application, the second through hole 12 is communicated with a device to be diagnosed. When the driving portion 50 is in the first state, the working state of the pumping equipment is pumping, the main channel 14 is blocked by the blocking portion 40, the opening 32 is opened, gas pumped into the accommodating cavity by the pumping equipment 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 equipment is pumping, 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 equipment and the first through hole. The pressure detected by the pressure sensor reaches a stable first pressure value in the process.

When the driving part 50 is in the second state, the working state of the gas pumping equipment is gas pumping, the plugging part 40 plugs the open hole 32, the main channel 14 is opened, the gas 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 gas pumping equipment is gas extraction, the gas in the equipment to be diagnosed enters the cavity through the second through hole, enters the accommodating cavity through the reference channel and the main channel, and flows out of the shell through the gas pumping equipment and the first through hole; the second pressure value is obtained when the pressure detected by the pressure sensor is stabilized in the process.

And judging whether the leakage amount of the equipment to be diagnosed is larger than the maximum allowable leakage amount or not according to the first pressure value and the second pressure value.

It can be known that, according to the leakage diagnosis device provided in the embodiment of the present application, it can be determined whether the leakage amount of the device to be diagnosed is greater than the maximum allowable leakage amount or not according to the stable pressure values detected by the pressure sensor when the detection driving part is in the first state and the second state, and the accuracy of the determination result determined according to the pressure value detected by the pressure sensor is high if the pressure value detected by the pressure sensor is hardly affected by external factors; all elements of the leakage diagnosis device are integrated in the shell, so that the compact arrangement of all elements is facilitated, and the occupied volume of the leakage diagnosis device is reduced; whether the leakage amount of the equipment to be diagnosed is larger than the maximum allowable leakage amount or not can be judged by matching the driving part with the air pumping equipment, and the leakage diagnosing device is simple in structure and contributes to reducing the cost of the leakage diagnosing device; in the process of leakage diagnosis, whether the leakage amount of the equipment to be diagnosed is larger than the maximum allowable leakage amount can be detected only by switching the two states of the driving part, and the operation is simple and easy.

In the first state and the second state of the driving portion 50, the operating state of the pumping device is the same, for example, in both the first state and the second state, the pumping device inflates the housing chamber; or the air pumping device sucks air from the containing cavity in the first state and the second state.

According to the characteristics of the air pumping equipment, when the air pumping equipment pumps air or exhausts air to a cavity, the air pressure value of the cavity can reach a stable value after a period of time. If the cavity has no leakage, the stable value when the gas pressure value of the cavity is stable is a fixed value, and the fixed value is related to the characteristic of the pumping equipment. If there is leakage in the chamber, the stable value when the gas pressure in the chamber is stable is different from the stable value when there is no leakage in the chamber. For example, when the pumping equipment pumps air to the cavity, the stable value of the gas pressure of the cavity can be 7 kPa; if there is a leak in the chamber, the gas pressure in the chamber reaches a steady value of less than 7 kPa. For example, when the pumping equipment pumps air from the containing cavity, the stable value of the gas pressure of the cavity can be made to be-6 kPa; if there is a leak in the chamber, the gas pressure in the chamber reaches a steady value of greater than-6 kPa.

Taking the working state of the air pumping equipment as an example of air pumping, the process of judging whether the leakage amount of the equipment to be diagnosed is larger than the maximum allowable leakage amount by using the leakage diagnosis device provided by the embodiment of the application is as follows:

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

If the first pressure value is smaller than or equal to the second pressure value, the leakage amount of the equipment to be diagnosed can be determined to be smaller 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 equipment to be diagnosed, the leakage amount of the equipment to be diagnosed is smaller than the maximum allowable leakage amount. If the first pressure value is larger than the second pressure value, the fact that the leakage amount of the equipment to be diagnosed is larger than the leakage amount of the reference channel is indicated, whether the difference value between the second pressure value and the first pressure value is larger than a first preset threshold value or not is judged, and if the difference value is larger than the first preset threshold value, the fact that the leakage amount of the equipment to be diagnosed is larger than the maximum allowable leakage amount is determined. When the first threshold value represents that the leakage amount of the equipment to be diagnosed is the maximum allowable leakage amount, the driving part receives the difference value between the pressure value and the first pressure value when the pressure of the cavity is stable in the second state.

In the embodiment of the application, the exhaust amount (leakage amount) of the reference channel is set to be smaller than the maximum allowable leakage amount 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, and avoid that the atmospheric pressure of the driving part in the first state and the atmospheric pressure in the second state are different, and the accuracy of the leakage judgment of the device to be diagnosed is affected, whether the leakage amount of the device to be diagnosed is greater than the maximum allowable leakage amount or not 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 judgment structure is more accurate. The first relative pressure corresponding to the first pressure value refers to a relative pressure value obtained through conversion according to the first pressure value, and the second relative pressure corresponding to the second pressure value refers to a relative pressure value 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 16 fixed in the housing 10, and a cavity in the housing 16 is the housing cavity 13. The pressure sensor 60 is fixedly disposed in the housing case 16.

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

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

In one embodiment, the flow area of the reference channel 15 is smaller than the flow area of the main channel 14. By such 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 when the driving part is in the second state, the gas flow of the gas passing through the main channel 14 is larger, and the gas pressure of the equipment to be diagnosed and the gas pressure in the accommodating cavity can be quickly balanced.

In one embodiment, the reference channel has an aperture in the range of 0.5mm to 0.8 mm. 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 mm-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 difference between the exhaust amount of the reference channel and the maximum allowable leakage amount of the equipment to be diagnosed is large, and the leakage amount of the reference channel cannot be effectively used as a reference for judging the leakage amount 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 pole of the power supply and the second electrode 204 is connected with the negative pole of the power supply, the air pumping device 20 pumps air to the device to be diagnosed; when the first electrode 203 is connected to the negative pole of the power supply and the second electrode 204 is connected to the positive pole of the power supply, the pumping device 20 draws 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 located in 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 energized, the first magnetic member 52 generates a magnetic attraction force on the second magnetic member 53 to drive the second magnetic member 53 to move, and the second magnetic member 53 drives the blocking portion 40 to move toward the opening 32; when the electromagnetic coil 51 is powered off, the magnetic attraction of the first magnetic member 52 to the second magnetic member 53 disappears, and the second magnetic member 53 drives the blocking portion 40 to move, so that the blocking portion moves in a direction away from the opening.

In this way, the switching between the two states of the driving unit 50 can be controlled by controlling the energization and deenergization of the electromagnetic coil 51, 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, and 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 to approach 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 elastic member 54 is a spring.

Further, the blocking portion 40 is located in the cavity 31 and located 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 a lower end of the second magnetic member 53 penetrates through the opening 32, enters the cavity 31, and is connected to the blocking portion 40. 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, 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 blocking portion 40 does not block the opening 32, 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 piece 41 and a second blocking piece 42, the first blocking piece 41 and the second blocking piece 42 are both connected to a portion of the second magnetic piece 53 located in the cavity 31, and the first blocking piece 41 is located on a side of the second blocking piece 42 facing away from the opening 32. In the first state, the first closure 41 closes the main channel 14 and the opening 32 is open; in the second state, the second closing member 42 closes the opening 32 and the main passage 14 is open.

In some embodiments, as shown in fig. 3 and 4, the leakage diagnosing apparatus 100 further includes a first elastic member 70 located in the chamber 31; the first elastic element 70 is located on one side of the blocking portion 40 departing from the opening 32, one end of the first elastic element 70 departing from the blocking portion 40 is fixed, and the other end of the first elastic element is abutted against the blocking portion 40. One end of the first elastic member 70 may be connected 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 member 53 moves in a direction away from the first magnetic member 52, the second magnetic member 53 drives the blocking portion 40 to move downwards, and the first elastic member 70 is compressed; when the electromagnetic coil 51 is energized, the second magnetic member 53 moves toward 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 toward the first magnetic member 52, so as to prevent the blocking portion 40 from blocking the opening 32 due to the fact that the second magnetic member 53 cannot move toward the first magnetic member 52. In some exemplary embodiments, the first elastic member 70 is a spring.

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

In another embodiment, the driving portion 50 includes a motor, the motor can drive the blocking portion 40 to move, the motor has two working states, in the first working state, the motor drives the blocking portion 40 to move in a direction away from the opening 32, so that the opening 32 is opened, and the blocking portion 40 blocks the main channel 14; in the second state, the motor drives the blocking portion 40 to move in a direction close to the opening 32, so that the blocking portion 40 blocks the opening 32 and the main channel 14 is opened. The opening or the blocking of the open hole 32 and the blocking part can be realized by controlling the working state of the motor, thereby being convenient for operation.

In one embodiment, the leak diagnosis apparatus 100 further includes an air filter disposed at the first through hole. With the arrangement, air in the atmosphere passes through the air filter firstly and then enters the air pumping device 20 and the chamber 31, and the air filter can filter impurities in the air, so that the impurities in the air entering the device to be diagnosed are less. In some exemplary embodiments, the air filter is a dust filter that filters dust from air.

In one embodiment, the leak diagnosis apparatus provided in the present application is provided with a connector, and the driving unit 50 and the pumping device 20 are electrically connected to an external power supply through the connector. In some embodiments, the connector is provided with a plurality of pins, two of the pins are electrically connected with the driving part, and the other two pins are electrically connected with the pumping equipment.

In one embodiment, the leakage diagnosis apparatus further includes a controller configured to determine whether the leakage amount of the device to be diagnosed is greater than a maximum allowable leakage amount according to the first pressure value and the second pressure value.

The embodiment of the application also provides a leakage diagnosis method, which is applied to a controller of a 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 unit is controlled to be in the first state, and the pumping device is controlled to be in an operating state so that the pumping device pumps air into or draws air from the housing chamber.

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 obtained.

In step 130, the driving unit is controlled to be in the second state, and the pumping device is controlled to be in the operating 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 obtained.

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

It should be noted that in step 110 and step 130, the pumping device is in the same operating state, both in the pumping operating state, or both in the pumping operating 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, step 130 and step 140 may be performed first, step 110 and step 120 may be performed after step 140, and step 150 may be performed last.

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 steps:

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

If the first pressure value and the second pressure value detected by the pressure sensor are absolute pressures, before step 150, the method for diagnosing leakage further includes: acquiring a first atmospheric pressure of the atmosphere while controlling the driving portion to be in the first state; acquiring a second atmospheric pressure of the atmosphere while controlling the driving portion 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 subtracts the first atmospheric pressure to obtain a first relative pressure, and the second pressure value subtracts 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.

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

The first preset threshold represents a difference value between the relative pressure and the first relative pressure when the pressure of the accommodating cavity is stable in the second state when the leakage amount of the equipment to be diagnosed is the maximum allowable leakage amount in 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 within a small range from the difference.

When the driving part is in the first state under the pumping state of the pumping equipment, the leakage quantity of the leakage diagnosis device is the leakage quantity of the reference channel; when the driving part is in the second state, 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. Whether the driving part is in the first state or the second state, the larger the leakage amount is, the smaller the pressure value when the pressure of the accommodating cavity is stabilized is, and the smaller the relative pressure of the accommodating cavity is.

When the first relative pressure is smaller than or equal to the second relative pressure, 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. If the first relative pressure is greater than the second relative pressure, which indicates that the leakage amount of the device to be diagnosed is greater than the leakage amount of the reference channel, it is necessary to continuously determine whether the difference between the first relative pressure and the second relative pressure is greater than a first preset threshold. When the difference value between the first relative pressure and the second relative pressure is larger than the first preset threshold value, the difference value between the leakage amount of the equipment to be diagnosed and the leakage amount of the reference channel is larger than the difference value 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 equipment 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 steps:

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

If the first pressure value and the second pressure value detected by the pressure sensor are absolute pressures, before step 150, the method for diagnosing leakage further includes: acquiring a first atmospheric pressure of the atmosphere while controlling the driving portion to be in the first state; acquiring a second atmospheric pressure of the atmosphere while controlling the driving portion 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. And subtracting the first pressure value from the first atmospheric pressure to obtain a first vacuum degree, and subtracting the second pressure value from the second atmospheric pressure to obtain a second vacuum degree.

If the pressure sensor is a vacuum meter and 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.

And when the pumping equipment is in an air exhaust state, the first pressure value and the second pressure value are both negative numbers. Since the first pressure value and the second pressure value are detected at different times, the atmospheric pressure may be different at different time points, 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 value between the vacuum degree and the first vacuum degree when the pressure of the accommodating cavity reaches stability when the leakage amount of the equipment to be diagnosed is the maximum allowable leakage amount under the air pumping state of the air pumping equipment and the driving part is in the second state. It should be noted that the second preset threshold may be equal to the difference, or may be within a small range from the difference.

When the pumping equipment is in an air extraction state and the driving part is in a first state, the leakage quantity of the leakage diagnosis device is the leakage quantity of the reference channel; when the driving part is in the second state, 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. Regardless of whether the driving unit is in the first state or the second state, the larger the leakage amount, the larger the pressure value at the time when the pressure of the housing chamber becomes stable, and the smaller the degree of vacuum of the housing chamber.

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 greater than the second vacuum degree, it is indicated that the leakage amount of the device to be diagnosed is greater than the leakage amount of the reference channel, and whether the difference value between the first vacuum degree and the second vacuum degree is greater than a second preset threshold value needs to be continuously judged. If the difference value between the first vacuum degree and the second vacuum degree is larger than the second preset threshold value, the difference value between the leakage amount of the equipment to be diagnosed and the leakage amount of the reference channel is larger than the difference value 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 one embodiment, the reference channel has an aperture in the range of 0.5mm to 0.8 mm.

The embodiment of the application also provides an engine system. Referring to fig. 9, the engine system includes an engine 84, an oil tank 81, and the leakage diagnosis apparatus 100 according to any of the above embodiments, the oil tank 81 is communicated with the second through hole of the housing, and the oil tank 81 is communicated with an 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 air pumping device 20 pumps air to the accommodating cavity or sucks air from the accommodating cavity, and when the pressure value detected by the pressure sensor is stable, the first pressure value detected by the pressure sensor is obtained; subsequently, the driving unit 50 is controlled to be in the second state, the pumping device 20 pumps air into or sucks air from the housing chamber, and when the pressure value detected by the pressure sensor is stabilized, a 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 or not according to the first pressure value and the second pressure value.

In one embodiment, the fuel tank 81 is in direct communication with an 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 in communication with the fuel tank 81, an outlet of the check valve 86 is in communication with 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 into the fuel tank 81.

In one embodiment, the engine system further comprises a carbon canister 82, the carbon canister 82 is connected between the second through hole of the housing and the oil tank 81, and the oil tank 81 is communicated with the second through hole through the carbon canister 82. Through setting up carbon tank 82, when the engine stalls, the petrol steam in the oil tank 81 enters into carbon tank 82, and the active carbon in carbon tank 82 adsorbs fuel steam, so can prevent that petrol steam from entering into the atmosphere, reaches the purpose of practicing thrift fuel and environmental protection. When the engine is started, fuel vapors stored in the canister 82 enter 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. A 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; in the leak diagnosis, the canister purge valve 87 is closed, the engine 84 is not communicated with the canister 82, and the leak diagnosis apparatus 100 detects whether or not the leak amount of the oil tank 81 is larger than the maximum allowable leak amount.

In one embodiment, the engine system further includes a throttle valve 88, an inlet of the throttle valve 88 communicating with the atmosphere and an outlet communicating with an intake manifold of the engine. The throttle 88 may control the amount of air that enters the engine 84.

In one embodiment, the engine system further includes an exhaust system 85, and the exhaust system 85 is used for discharging exhaust gas discharged during the operation of the engine 84, and can reduce pollution and noise of the discharged exhaust gas.

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

Although the present application has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application, and all changes, substitutions and alterations that fall within the spirit and scope of the application are to be understood as being covered by the following claims.

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 official records and records.

Claims (10)

1. A leak diagnosis device 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 a device to be diagnosed; the shell is provided with an accommodating 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 volume of the reference channel is less than the maximum allowable leakage volume of the equipment to be diagnosed;

the air pumping device (20) is positioned in the shell (10) and comprises a first air port (21) and a second air port (22) 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;

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

a partition plate (30) positioned in the shell, wherein the partition plate (30) and the shell enclose a chamber (31), the reference channel and the main channel are respectively communicated with the chamber (31), and the chamber 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 blocking portion (40) located within the chamber;

the driving part (50) is positioned in the shell, and the plugging part is connected with the driving part; the driving part has a first state and a second state, in the first state, the driving part drives the blocking part to move in a direction away from the opening, the opening is opened, and the blocking part blocks the main channel; in the second state, the driving part drives the blocking part to move towards the open hole, the blocking part blocks the open hole, and the main channel is opened.

2. The leak diagnosis device according to claim 1, wherein the drive 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 blocking part; the first magnetic part and the second magnetic part are magnetic parts which can be magnetized in a magnetic field;

when the electromagnetic coil is electrified, the first magnetic piece generates magnetic attraction force on 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 plugging part to move so that the plugging part moves in a direction away from the hole;

alternatively, the driving part includes a motor.

3. The leak diagnosis device according to claim 2, wherein the main channel is located at a side of the opening facing away from the first magnetic member, and an end of the second magnetic member (53) facing away from the first magnetic member is inserted through the opening (32) into the chamber; the blocking part comprises a first blocking piece and a second blocking piece, and the first blocking piece is positioned on one side, away from the opening, of the second blocking piece;

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 open hole, and the main channel is opened.

4. The leak diagnostic apparatus according to claim 2, further comprising a first elastic member (70) located within the chamber (31); the first elastic piece is located one side of the blocking portion, which deviates from the opening, one end of the first elastic piece, which deviates from the blocking portion, is fixed, and the other end of the first elastic piece is abutted to the blocking portion.

5. The leak diagnosis device according to claim 2, wherein the drive portion (50) further includes a second elastic member (54); one end of the second elastic piece is connected with the first magnetic piece, and the other end of the second elastic piece is abutted against the second magnetic piece.

6. The leak diagnostic device according to claim 1, wherein the reference channel has a bore diameter in a range of 0.5mm to 0.8 mm.

7. The leak diagnostic device according to claim 1, wherein a flow area of the main channel is larger than a flow area of the reference channel.

8. The leak diagnostic apparatus according to claim 1, further comprising an air filter provided at the first through hole.

9. An engine system comprising an engine, an oil tank, and the leak diagnosis device according to any one of claims 1 to 8, wherein the oil tank is in communication with the second through hole.

10. A vehicle comprising the engine system of claim 9.

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