Leakage diagnosis device, engine system, and vehicle

Abstract

The application provides a leakage diagnosis device, an engine system and a vehicle. The leakage diagnosis device comprises a housing, a pumping device, a partition plate, a blocking part, a driving part and a one-way flow element in the housing. The housing is provided with a first through hole and a second through hole. The first through hole is in communication with the atmosphere, and the second through hole is used for communication with a device to be diagnosed. The pumping device comprises a first gas port and a second gas port in communication. The first gas port is in communication with the first through hole. The partition plate and the housing enclose a chamber. The chamber is in communication with the second through hole. The partition plate is provided with an opening. The first through hole is in communication with the second through hole through the opening. The blocking part is located on one side of the opening. The driving part is connected with the blocking part. The driving part can drive the blocking part to move, so that the blocking part blocks the opening or opens the opening. The one-way flow element comprises a first port and a second port. The first port is in communication with the second gas port. The flow direction of the one-way flow element is the same as the flow direction of the gas flow in the pumping device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of leakage diagnosis, in particular to a leakage diagnosis device, an engine system and a vehicle. BACKGROUND

[0002] With the improvement of living standards, the automobile has become a common means of transportation. When the oil tank of the automobile leaks, the gasoline in the oil tank volatilizes into the air, causing air pollution, which is not conducive to environmental protection, and thus it is necessary to detect whether the oil tank leaks beyond the allowable range.

[0003] In one scheme, the leakage of the oil tank is calculated by the current change of the air pump for pumping air to the oil tank, and then it is judged whether the leakage exceeds the allowable range. However, the leakage of the oil tank calculated in this scheme is affected by voltage fluctuations and the parking slope of the vehicle, which affects the accuracy of the detected leakage of the oil tank. SUMMARY

[0004] The present application provides a leakage diagnosis device, an engine system and a vehicle.

[0005] According to a first aspect of the embodiments of the present application, a leakage diagnosis device is provided. The leakage diagnosis device comprises:

[0006] a housing, the housing is provided with a first through hole and a second through hole, the first through hole is in communication with the atmosphere, and the second through hole is used for communication with a device to be diagnosed;

[0007] a pumping device located in the housing, the pumping device comprising a first air port and a second air port in communication, the first air port being in communication with the first through hole;

[0008] a partition plate located in the housing, the partition plate and the housing enclosing a cavity, the cavity being in communication with the second through hole, the partition plate being provided with an opening, and the first through hole being in communication with the second through hole through the opening;

[0009] a plugging part located on one side of the opening;

[0010] a driving part located in the housing, the driving part being connected with the plugging part; the driving part can drive the plugging part to move, so as to plug the opening or open the opening;

[0011] a one-way flow element located in the housing, the one-way flow element comprising a first port and a second port, the first port being in communication with the second air port; the flow direction of the one-way flow element is the same as the flow direction of the air flow in the pumping device.

[0012] In one embodiment, the air pumping device sucks air from the first air port and discharges air from the second air port; the first port of the one-way flow element is an inlet, and the second port of the one-way flow element is an outlet.

[0013] Alternatively,

[0014] the air pumping device sucks air from the second air port and discharges air to the atmosphere from the first air port; the first port of the one-way flow element is an outlet, and the second port of the one-way flow element is an inlet.

[0015] In one embodiment, the driving part comprises an electromagnetic coil, a first magnetic member and a second magnetic member; the electromagnetic coil is fixed in the housing, the first magnetic member is fixed in the electromagnetic coil; the second magnetic member is movably located in the electromagnetic coil and connected with the blocking part; the first magnetic member and the second magnetic member are magnetic members that can be magnetized in a magnetic field;

[0016] When the electromagnetic coil is energized, the first magnetic member generates a magnetic attraction force on the second magnetic member, driving the second magnetic member and the blocking part to move towards the opening, and the blocking part blocks the opening; when the electromagnetic coil is de-energized, the magnetic attraction force of the first magnetic member on the second magnetic member disappears, and the second magnetic member drives the blocking part to move away from the opening, and the opening communicates the chamber with the first through hole;

[0017] Alternatively, the driving part comprises a motor.

[0018] In one embodiment, the blocking part is located in the chamber and below the opening; the second magnetic member is located below the first magnetic member, and the second magnetic member is connected with the blocking part through the opening.

[0019] In one embodiment, the leakage diagnosis device further comprises an elastic member located in the chamber; one end of the elastic member is fixed, and the other end abuts against the blocking part.

[0020] In one embodiment, the housing is provided with a first channel, and the one-way flow element comprises a one-way valve arranged in the first channel.

[0021] In one embodiment, the housing is provided with a second channel communicating the first port of the one-way flow element with the second air port, and a third channel communicating the chamber with the second port of the one-way flow element.

[0022] The leakage diagnosis device further comprises a heating element arranged in the second channel, the third channel or the chamber.

[0023] In one embodiment, the leakage diagnosis device further comprises an air filter, an inlet of the air filter is in communication with the atmosphere, and outlets of the air filter are respectively in communication with the first through holes.

[0024] According to a second aspect of the embodiments of the present application, an engine system is provided, which comprises an engine, an oil tank, and the leakage diagnosis device described above, the oil tank being in communication with the second through hole.

[0025] According to a third aspect of the embodiments of the present application, a vehicle is provided, which comprises the engine system described above.

[0026] The leakage diagnosis device, the engine system, and the vehicle provided by the embodiments of the present application can diagnose the leakage of the device to be diagnosed. When diagnosing the leakage of the device to be diagnosed, the driving part drives the blocking part to move so that the blocking part blocks the opening. The pumping device is in communication with the device to be diagnosed through the one-way flow element, the chamber, and the second through hole. The pumping device pumps air to or from the device to be diagnosed. If the pumping device pumps air to the device to be diagnosed, the one-way flow element can prevent the air from flowing out of the device to be diagnosed after the pumping device stops working. If the pumping device pumps air from the device to be diagnosed, the one-way flow element can prevent the air from flowing into the device to be diagnosed after the pumping device stops working. The change of the air pressure in the device to be diagnosed can be detected to determine whether the device to be diagnosed has a leakage beyond the allowable range. After the leakage diagnosis is completed, the driving part drives the blocking part to move so that the opening communicates the chamber with the first through hole, and the device to be diagnosed is in communication with the atmosphere, so that the pressure of the device to be diagnosed is balanced with the atmospheric pressure. It can be known that the leakage diagnosis device provided by the embodiments of the present application can diagnose whether the device to be diagnosed has a leakage beyond the allowable range by the cooperation of the driving part, the one-way flow element, and the pumping device. The structure of the leakage diagnosis device is simple, which helps to reduce the cost of the leakage diagnosis device. During the leakage diagnosis, only the driving part needs to be operated to detect whether the device to be diagnosed has a leakage within the allowable range and to balance the pressure of the device to be diagnosed with the atmospheric pressure after the detection is completed. The operation is relatively simple and easy to operate. In addition, all the elements of the leakage diagnosis device are integrated in the shell, which helps to arrange the elements compactly and reduce the volume of the leakage diagnosis device.

[0027] It should be understood that the general description above and the detailed description below are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0028] The drawings incorporated in the specification and constituting a part of the specification illustrate embodiments consistent with the present application and, together with the specification, serve to explain the principles of the present application.

[0029] Figure 1 A sectional view of the leakage diagnosis device provided for an exemplary embodiment of the present application;

[0030] Figure 2 A cross-sectional view of a housing of a leak diagnosis device according to an example embodiment of the present application;

[0031] Figure 3 A perspective structural view of a leak diagnosis device according to an example embodiment of the present application;

[0032] Figure 4 A structural view of a pump device according to an example embodiment of the present application;

[0033] Figure 5 A structural view of an engine system according to an example embodiment of the present application; Figure 1 A schematic view of a flow direction of a gas in a leak diagnosis device according to an example embodiment of the present application;

[0034] Figure 6 A schematic view of a flow direction of a gas in a leak diagnosis device according to an example embodiment of the present application; Figure 1 A schematic view of a flow direction of a gas in a leak diagnosis device according to an example embodiment of the present application;

[0035] Figure 7 A partial cross-sectional view of a leak diagnosis device according to an example embodiment of the present application;

[0036] Figure 8 A structural view of an engine system according to an example embodiment of the present application. DETAILED DESCRIPTION

[0037] The example embodiments will now be described in detail with reference to the drawings. When the description is made with reference to the drawings, identical or similar components are denoted by the same reference numerals, and repeated description of these components is omitted. The following example embodiments described in the example embodiments do not represent all embodiments in accordance with the present application. Rather, they are merely examples in accordance with some aspects of the present application as detailed in the appended claims.

[0038] 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 the description of the 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.

[0039] It should be understood that the use of "first", "second", and "third" words in the present application specification and claims do not represent any order, quantity or importance, but only distinguish different components. Similarly, "one" or "a" and similar words do not represent a quantity limitation, but represent the existence of at least one. Unless otherwise indicated, "front", "back", "lower" and / or "upper" and similar words are only for convenience of description, and are not limited to a position or a spatial orientation. "Include" or "contain" and similar words mean that the elements or objects appearing before "include" or "contain" cover the elements or objects listed after "include" or "contain" and their equivalents, and do not exclude other elements or objects.

[0040] The leakage diagnosis device, engine system and vehicle of the embodiments of the present application will be described in detail below with reference to the accompanying drawings. The features in the following embodiments and implementation manners can be supplemented or combined with each other without conflict.

[0041] The leakage diagnosis device provided by the embodiments of the present application is described below. Figures 1 to 4 The leakage diagnosis device 100 includes a housing 10, a pumping device 20, a partition plate 30, a plugging part 40, a driving part 50 and a one-way flow element 60.

[0042] The housing 10 is provided with a first through hole 11 and a second through hole 12. The first through hole 11 is in communication with the atmosphere, and the second through hole 12 is used to communicate with the device to be diagnosed. The housing 10 is provided with a receiving cavity 101, and the pumping device 20, the partition plate 30, the plugging part 40, the driving part 50 and the one-way flow element 60 are located in the housing 10. The first through hole 11 can be arranged on the side of the housing 10, and the second through hole 12 can be arranged on the bottom of the housing 10.

[0043] The pumping device 20 is located in the first housing 10, and the pumping device 20 includes a first gas port 201 and a second gas port 202 in communication. The first gas port 201 is in communication with the first through hole 11.

[0044] The partition plate 30 is located in the housing 10, and the partition plate 30 and the housing 10 enclose a cavity 31. Specifically, the partition plate 30 and part of the inner wall of the housing 10 enclose the cavity 31. The cavity 31 is in communication with the second through hole 12. The partition plate 30 is provided with an opening 32, and the first through hole 11 communicates with the second through hole 12 through the opening 32.

[0045] The blocking part 40 is located at one side of the opening 32. The driving part 50 is located in the shell 10, and the driving part 50 is connected with the blocking part 40. The driving part 50 can drive the blocking part 40 to move, so that the blocking part 40 blocks the opening 32 or opens the opening 32.

[0046] The one-way flow element 60 is located in the shell 10, and the one-way flow element 60 comprises a first port and a second port, the first port is communicated with the second gas port 202. The flow direction of the one-way flow element 60 is the same as the flow direction of the gas in the pump gas device 20. Wherein, the flow direction of the one-way flow element 60 is the same as the flow direction of the gas in the pump gas device 20 means that the one-way flow element 60 is communicated with the pump gas device 20; when the pump gas device 20 inhales air from the atmosphere, the gas flows from the first gas port 201 to the second gas port 202, at this time, the flow direction of the one-way flow element 60 is the direction from the first port to the second port; when the pump gas device 20 exhausts air to the atmosphere, the gas flows from the second gas port 202 to the first gas port 201, at this time, the flow direction of the one-way flow element 60 is the direction from the second port to the first port.

[0047] The leakage diagnosis device provided by the embodiment of the present application can drive the blocking part 40 to block the opening 32 when the leakage diagnosis device diagnoses the to-be-diagnosed device, the pump gas device 20 is communicated with the to-be-diagnosed device through the one-way flow element 60, the chamber 31 and the second through hole 12, and the pump gas device pumps gas to the to-be-diagnosed device or inhales gas from the to-be-diagnosed device; if the pump gas device pumps gas to the to-be-diagnosed device, the one-way flow element 60 can prevent the gas from flowing out of the to-be-diagnosed device after the pump gas device stops working; if the pump gas device inhales gas from the to-be-diagnosed device, the one-way flow element 60 can prevent air from entering the to-be-diagnosed device after the pump gas device stops working; by detecting the change of the gas pressure in the to-be-diagnosed device, it can be judged whether the to-be-diagnosed device has leakage beyond the allowable range. After the leakage diagnosis is completed, the driving part drives the blocking part to move so that the opening 32 communicates the chamber 31 with the first through hole 11, so that the to-be-diagnosed device is communicated with the atmosphere, and the pressure of the to-be-diagnosed device can be balanced with the atmospheric pressure. It can be known that the leakage diagnosis device provided by the embodiment of the present application can diagnose whether the to-be-diagnosed device has leakage beyond the allowable range by cooperating the driving part and the one-way flow element with the pump gas device, the structure of the leakage diagnosis device is simple, which helps to reduce the cost of the leakage diagnosis device; in the leakage diagnosis process, only the driving part needs to be operated, so that whether the to-be-diagnosed device has leakage within the allowable range can be detected, and the pressure of the to-be-diagnosed device can be balanced with the atmospheric pressure after the detection is completed, the operation is relatively simple and easy to operate; and all elements of the leakage diagnosis device are integrated in the shell 10, which helps to arrange the elements compactly and helps to reduce the volume occupied by the leakage diagnosis device.

[0048] In one embodiment, the air pumping device 20 draws in air through the first air port 201 and discharges air through the second air port 202; the first port of the one-way flow element 60 is the inlet, and the second port of the one-way flow element 60 is the outlet. Figure 5 The arrows in the diagram indicate the direction of gas flow. For example... Figure 5 As shown, air from the atmosphere enters the pumping device through the first through-hole 11 and the first air port 201. Air discharged from the second air port 202 enters the chamber 31 through the one-way flow element 60, and finally flows out of the housing 10 through the second through-hole 12 and into the device under test. The air pressure in the device under test gradually increases. When the air pressure in the device under test rises to the first threshold range, the pumping device 20 stops pumping air into the device under test. The one-way flow element 60 prevents gas from flowing into the atmosphere from the device under test, ensuring the accuracy of the diagnosis. Subsequently, the pressure change in the device under test is detected in real time, and the pressure change curve of the device under test is obtained. The processor determines the pressure change rate of the device under test based on the pressure change curve, and then determines the leakage of the device under test. By comparing the leakage of the device under test with the reference leakage, it can be determined whether the device under test has a leakage within the allowable range. The first threshold range can be determined based on the maximum pressure that the device under test can withstand. For example, if the maximum pressure that the device under test can withstand is 3.5 kPa, the first threshold range can be 3 kPa to 3.2 kPa. The reference leakage rate is the leakage rate within the allowable range of the equipment to be diagnosed.

[0049] In another embodiment, the air pumping device 20 draws in air through the second air port 202 and discharges air to the atmosphere through the first air port 201; the first port of the one-way flow element 60 is the outlet, and the second port of the one-way flow element 60 is the inlet. Figure 6 The arrows in the diagram indicate the direction of gas flow. For example... Figure 6 As shown, gas in the device under test enters the chamber 31 through the second through-hole 12, then passes through the one-way flow element 60 and the second air port 202 into the pumping device, and is then discharged to the atmosphere through the first air port 201 and the first through-hole 11, gradually reducing the gas pressure in the device under test. When the gas pressure in the device under test decreases to the second threshold range, the pumping device 20 stops drawing gas from the device under test. The one-way flow element 60 prevents air from the atmosphere from entering the device under test, ensuring the accuracy of the diagnosis. Subsequently, the pressure change in the device under test is detected in real time, resulting in a pressure change curve. The processor determines the rate of pressure change of the device under test based on the pressure change curve, thereby determining the leakage amount of the device under test. By comparing the leakage amount of the device under test with the reference leakage amount, it can be determined whether the device under test has a leakage within the allowable range.

[0050] In one embodiment, seeFigure 4 The pumping device 20 includes a first electrode 203 and a second electrode 204. When the first electrode 203 is connected to the positive pole of the power supply and the second electrode 204 is connected to the negative pole of the power supply, the pumping device 20 pumps air into 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 sucks air from the device to be diagnosed.

[0051] In one embodiment, the driving part 50 and the pumping device 20 are arranged in the upper part of the accommodating cavity 101, the one-way flow element 60 is arranged below the pumping device 20, and the chamber 31 and the blocking part 40 are arranged in the lower part of the driving part 50. In this way, the elements in the shell 10 are arranged relatively compactly in the accommodating cavity 101, and the space in the shell 10 can be fully utilized.

[0052] In one embodiment, the shell 10 is provided with a first channel 17, and the one-way flow element 60 includes a one-way valve arranged in the first channel 17. The one-way flow element 60 is fixed in the first channel 17, and there is no gap between the one-way flow element 60 and the side wall of the first channel 17. When air passes through the first channel 17, it can only pass through the one-way flow element 60. By arranging the first channel 17, the one-way flow element 60 is facilitated to be fixed. In some embodiments, the one-way valve is a diaphragm type one-way valve.

[0053] In one embodiment, the shell 10 is provided with a second channel 13 communicating the first port of the one-way flow element 60 and the second air port 202, and a third channel 18 communicating the chamber 31 and the second port of the one-way flow element 60. The second channel 13 is arranged above the first channel 17 and communicates with the upper port of the first channel 17.

[0054] In one embodiment, the third channel 18 includes a first sub-channel 14 and a second sub-channel 15. The first sub-channel 14 extends substantially in the horizontal direction, and the second sub-channel 15 extends substantially in the vertical direction. One end of the first sub-channel 14 communicates with the lower port of the second channel 13, and the other end of the first sub-channel 14 communicates with the lower end of the second sub-channel 15. The upper end of the second sub-channel 15 communicates with the chamber 31. By arranging the first sub-channel 14 and the second sub-channel 15, the one-way flow element 60 can communicate with the chamber 31.

[0055] Referring again to Figure 5 When the pumping device pumps external air into the device to be diagnosed, the external air passes through the first through hole 11, the pumping device 20, the second channel 13, the one-way flow element 60, the first sub-channel 14, the second sub-channel 15, the chamber 31, and the second through hole 12 in sequence and enters the device to be diagnosed.

[0056] Referring again to Figure 6When the pump device inhales air from the device to be diagnosed, the air in the device to be diagnosed passes through the second through hole 12, the chamber 31, the second sub-channel 15, the first sub-channel 14, the one-way flow element 60, the second channel 13, the pump device 20 and the first through hole 11 in sequence and is discharged to the atmosphere.

[0057] In one embodiment, referring to Figure 7 The driving part 50 comprises 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, the first magnetic member 52 is fixed in the electromagnetic coil 51, and the second magnetic member 53 is movably located in the electromagnetic coil 51 and connected with the blocking part 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 powered, the first magnetic member 52 generates a magnetic attraction force to the second magnetic member 53, driving the second magnetic member 53 to move. The second magnetic member 53 drives the blocking part 40 to move towards the opening 32, and the blocking part 40 blocks the opening 32. When the electromagnetic coil 51 is powered off, the magnetic attraction force of the first magnetic member 52 to the second magnetic member 53 disappears, and the second magnetic member 53 drives the blocking part 40 to move away from the opening 32. The opening 32 connects the chamber 31 and the first through hole 11.

[0058] In this way, when the device to be diagnosed needs to be diagnosed for leakage, the electromagnetic coil 51 is powered, the second magnetic member 53 drives the blocking part 40 to move towards the opening 32, and the blocking part 40 blocks the opening 32. After the leakage diagnosis is completed, the electromagnetic coil 51 is powered off, the second magnetic member 53 drives the blocking part 40 to move away from the opening 32, and the opening 32 connects the chamber 31 and the first through hole 11. That is, whether the opening 32 is opened or not can be controlled by controlling the power-on and power-off of the electromagnetic coil 51, which is convenient to operate.

[0059] In one embodiment, the first magnetic member 52 and the second magnetic member 53 are magnetic members that can be magnetized in a magnetic field. In this way, when the electromagnetic coil is powered, the first magnetic member 52 generates a magnetic attraction force to the second magnetic member; when the electromagnetic coil is powered off, the magnetic attraction force of the first magnetic member 52 to the second magnetic member disappears. In some embodiments, the materials of the first magnetic member 52 and the second magnetic member 53 can be iron.

[0060] In other embodiments, the driving part 50 comprises a motor which can drive the blocking part 40 to move. The motor has two working states. In the first working state, the motor drives the blocking part 40 to move away from the opening hole 32, so as to open the opening hole 32. In the second working state, the motor drives the blocking part 40 to move towards the opening hole 32, so as to block the opening hole 32 by the blocking part 40. The opening or blocking of the opening hole 32 can be realized by controlling the working state of the motor, which is convenient for operation.

[0061] Further, the blocking part 40 is located in the cavity 31 and below the opening hole 32. The second magnetic member 53 is located below the first magnetic member 52 and connected with the blocking part 40 through the opening hole 32. The area of the opening hole 32 is greater than the cross section of the part of the second magnetic member 53 passing through the opening hole 32. There is a gap between the part of the second magnetic member 53 passing through the opening hole 32 and the opening hole 32. When the opening hole 32 is not blocked by the blocking part 40, the gas can pass through the gap between the part of the second magnetic member 53 passing through the opening hole 32 and the opening hole 32. In this way, after the electromagnetic coil 51 is powered off, the magnetic attraction force of the first magnetic member 52 to the second magnetic member 53 disappears, and the second magnetic member 53 moves downward under the action of gravity, thereby driving the blocking part 40 to move downward, and the opening hole 32 is opened.

[0062] Further, the driving part 50 further comprises an elastic member 54. One end of the elastic member 54 is connected with the first magnetic member 52, and the other end of the elastic member 54 is connected with the second magnetic member 53. When the electromagnetic coil 51 is powered on, the second magnetic member 53 moves towards the first magnetic member 52, and the elastic member 54 is compressed. When the electromagnetic coil 51 is powered off, the magnetic attraction force of the first magnetic member 52 to the second magnetic member 53 disappears, and the elastic member 54 is stretched, and the electromagnetic coil 51 moves away from the first magnetic member 52. After the electromagnetic coil 51 is powered off, the elastic member 54 provides a downward moving force for the second magnetic member 53, which can avoid the situation that the second magnetic member 53 is stuck and cannot move downward after the electromagnetic coil 51 is powered off. In some example embodiments, the elastic member 54 is a spring.

[0063] In one embodiment, referring again to Figure 1The leakage diagnosis device 100 further comprises an elastic member 70 located in the chamber 31. One end of the elastic member 70 is fixed, and the other end is in abutment with the blocking part 40. Specifically, the elastic member 70 is located on the side of the blocking part 40 away from the opening 32. One end of the elastic member 70 can be connected with the inner wall of the shell 10, so as to be fixed in the shell 10. When the electromagnetic coil 51 is powered off, the second magnetic member 53 moves away from the first magnetic member 52, the second magnetic member 53 pushes the blocking part 40 to move downward, and the elastic member 70 is compressed. When the electromagnetic coil 51 is powered on, the second magnetic member 53 moves towards the first magnetic member 52, the elastic member 70 is stretched, and the second magnetic member 53 is pushed to move towards the first magnetic member 52. This can avoid the situation that the second magnetic member 53 cannot move towards the first magnetic member 52 smoothly, and the blocking part 40 cannot block the opening 32. In some example embodiments, the elastic member 70 is a spring.

[0064] In one embodiment, the leakage diagnosis device further comprises a heating element, which is arranged in the second channel 13, the third channel 18 or the chamber 31. Specifically, when the heating element is arranged in the third channel 18, it can be arranged in the first sub-channel 14 or the second sub-channel 15. Because the density of gas at different temperatures is different, when the leakage amount of the device to be diagnosed is constant, the change speed of the air pressure in the device to be diagnosed at different temperatures is also different, which will affect the determination of the leakage amount of the device to be diagnosed. By arranging the heating element, the heating element can heat the gas before it flows into the device to be diagnosed, so that the air entering the device to be diagnosed reaches a specified temperature, and the reference leakage amount of the device to be diagnosed is also measured at the specified temperature. In this way, the influence of temperature on the detected leakage amount of the device to be diagnosed can be avoided, and the accuracy of the leakage diagnosis can be improved. In some embodiments, the heating element can be a thermistor.

[0065] In one embodiment, the leakage diagnosis device 100 further comprises an air filter, the inlet of the air filter is in communication with the atmosphere, and the outlet of the air filter is in communication with the first through hole, respectively. In this way, the air in the atmosphere first passes through the air filter and then enters the air pumping device 20 and the chamber 31. The air filter can filter out impurities in the air, so as to ensure that the air entering the device to be diagnosed contains fewer impurities. In some example embodiments, the air filter is a dust filter, which can filter out dust in the air.

[0066] In one embodiment, the leakage diagnosis device of the present application is provided with a plug-in connector, and the driving part 50, the air pumping device 20 and the heating element are electrically connected with an external power source through the plug-in connector. In some embodiments, the plug-in connector is provided with eight pins, two of which are electrically connected with the driving part 50, another two are electrically connected with the air pumping device, and the remaining two are electrically connected with the heating element.

[0067] The application further provides an engine system. Referring to Figure 8 The engine system comprises an engine 24, an oil tank 21 and the leakage diagnosis device 100 according to any one of the above embodiments, the oil tank 21 is communicated with the second through hole of the shell, and the oil tank 21 is communicated with an intake manifold of the engine 24.

[0068] The engine system provided by the application can block the opening by the blocking part when it is necessary to diagnose whether the oil tank has a leakage beyond the allowable range, and the pump 20 pumps air into or absorbs air from the oil tank 21, and then whether the oil tank has a leakage beyond the allowable range is judged according to the change of the air pressure in the oil tank 21 after the pumping or the absorbing is stopped. When the engine is running, the blocking part is far away from the opening, and the opening communicates the chamber and the first through hole, so that the air in the atmosphere can enter the oil tank through the first through hole and the chamber, and mix with the gasoline vapor in the oil tank, and the mixed gas enters the engine 24. According to the above analysis, the diagnosis device can diagnose whether the oil tank 21 has a leakage beyond the allowable range, and does not affect the air entering the oil tank when the engine is running.

[0069] In one embodiment, the oil tank 21 is directly communicated with the intake manifold of the engine 24, and the engine system further comprises a one-way valve 26 connected between the oil tank 21 and the engine 24, the inlet of the one-way valve 26 is communicated with the oil tank 21, and the outlet of the one-way valve 26 is communicated with the intake manifold of the engine 24, so that the fuel vapor in the oil tank 21 can enter the engine 24 through the one-way valve 26. The one-way valve 26 can prevent the fuel vapor from flowing back to the oil tank 21.

[0070] In one embodiment, the engine system further comprises a carbon canister 22 connected between the second through hole of the shell and the oil tank 21, and the oil tank 21 is communicated with the second through hole through the carbon canister 22. By arranging the carbon canister 22, when the engine is turned off, the gasoline vapor in the oil tank 21 enters the carbon canister 22, and the activated carbon in the carbon canister 22 adsorbs the fuel vapor, so that the gasoline vapor can be prevented from entering the atmosphere, and the purposes of saving fuel and environmental protection are achieved. When the engine is started, the fuel vapor stored in the carbon canister 22 enters the intake manifold of the engine. The leakage diagnosis device 100 can diagnose whether the carbon canister 22 and the oil tank 21 have a leakage beyond the allowable range.

[0071] In one embodiment, referring to Figure 3The engine system further comprises a carbon can purge valve 27, which is connected between the carbon can 22 and the intake manifold of the engine 24. When the engine 24 is started, the carbon can purge valve 27 connects the carbon can 22 with the engine 24, and the gas in the carbon can 22 enters the engine 24 through the carbon can purge valve 27; when the leakage diagnosis is performed, the carbon can purge valve 27 is closed, and the engine 24 is not connected with the carbon can 22, and the leakage diagnosis device 100 detects whether there is leakage beyond the allowable range in the carbon can 22 and the fuel tank 21.

[0072] In one embodiment, the engine system further comprises a pipe 29 connecting the carbon can 22 and the fuel tank 21. The engine system further comprises a gas pressure sensor 23, which is arranged in the pipe 29. When the leakage diagnosis is performed, the gas pressure in the carbon can 22 and the fuel tank 21 is the same, the gas pressure sensor 23 detects the gas pressure, and then whether there is leakage beyond the allowable range in the fuel tank 21 and the carbon can 22 can be determined according to the pressure detected by the gas pressure sensor 23.

[0073] In one embodiment, the engine system further comprises a throttle valve 28, the inlet of which is connected with the atmosphere, and the outlet is connected with the intake manifold of the engine. The throttle valve 28 can control the amount of air entering the engine 24.

[0074] In one embodiment, the engine system further comprises an exhaust system 25, which is used to discharge the exhaust gas discharged in the working process of the engine 24, and can reduce the pollution and noise of the exhaust gas.

[0075] The embodiments of the present application further provide a vehicle comprising the engine system described in the above embodiments.

[0076] The above only describes the preferred embodiments of the present application, and does not limit the present application in any form. Although the preferred embodiments of the present application are described above, the present application is not limited thereto. Any person skilled in the art can make some changes or modifications to the above-mentioned technical contents without departing from the scope of the technical solution of the present application, and the equivalent embodiments with equivalent changes and modifications are obtained. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application are still within the scope of the technical solution of the present application.

[0077] The content disclosed in the present patent document contains copyrighted material. The copyright owner does not object to the facsimile reproduction of the patent document or the patent disclosure in the official records and archives of the Patent and Trademark Office.

Claims

1. A leak diagnosis device, characterized in that, The leak diagnostic device includes: The housing (10) is provided with a first through hole (11) and a second through hole (12). The first through hole is connected to the atmosphere, and the second through hole is used to connect to the device to be diagnosed. A pumping device (20) is located inside the housing (10). The pumping device includes a first air port (201) and a second air port (202) that are connected. The first air port is connected to the first through hole. A partition (30) is located inside the housing. The partition (30) and the housing enclose a cavity (31). The cavity (31) communicates with the second through hole (12). An opening (32) is provided on the partition (30). The first through hole (11) communicates with the second through hole (12) through the opening (32). The sealing part (40) is located on one side of the opening (32); A driving part (50) is located inside the housing and is connected to the sealing part. The driving part can drive the sealing part to move so that the sealing part blocks the opening or opens the opening. The driving part (50) includes an electromagnetic coil (51), a first magnetic element (52), a second magnetic element (53), and a first elastic element (54). The electromagnetic coil is fixed inside the housing, and the first magnetic element is fixed inside the electromagnetic coil. The second magnetic element is movably located inside the electromagnetic coil and is connected to the sealing part. The first magnetic element and the second magnetic element are magnetic elements that can be magnetized in a magnetic field. One end of the first elastic element is connected to the first magnetic element, and the other end is connected to the second magnetic element. When the electromagnetic coil is energized, the first magnetic element generates a magnetic attraction force on the second magnetic element, causing the second magnetic element to move. The second magnetic element then moves the sealing part closer to the opening, sealing the opening and compressing the first elastic element. When the electromagnetic coil is de-energized, the magnetic attraction force between the first magnetic element and the second magnetic element disappears, and the second magnetic element moves the sealing part away from the opening. The opening connects the chamber to the first through hole, and the first elastic element extends. The second elastic element (70) is located in the cavity (31). The elastic element is located on the side of the sealing part away from the opening. One end of the elastic element is fixed and the other end abuts against the sealing part. A one-way flow element (60) is located inside the housing. The one-way flow element includes a first port and a second port. The first port is connected to the second air port (202). The flow direction of the one-way flow element is the same as the flow direction of the airflow in the pumping device.

2. The leak diagnosis device according to claim 1, characterized in that, The air pumping device draws in air through the first air port (201) and discharges air through the second air port (202); the first port of the one-way flow element is the inlet, and the second port of the one-way flow element is the outlet; or, The air pumping device draws in air through the second air port (202) and discharges the air to the atmosphere through the first air port (201); the first port of the one-way flow element is the outlet, and the second port of the one-way flow element is the inlet.

3. The leak diagnosis device according to claim 1, characterized in that, The sealing part (40) is located inside the chamber (31) and below the opening; the second magnetic element (53) is located below the first magnetic element (52), and the second magnetic element (53) passes through the opening (32) and is connected to the sealing part.

4. The leak diagnosis device according to claim 1, characterized in that, The housing has a first channel (17), and the one-way flow element (60) includes a one-way valve disposed in the first channel (17).

5. The leak diagnosis device according to claim 1, characterized in that, The housing is provided with a second channel (13) connecting the first port of the one-way flow element and the second air port, and a third channel (18) connecting the chamber and the second port of the one-way flow element. The leak diagnosis device further includes a heating element, which is disposed in the second channel (13), the third channel (18), or the chamber (31).

6. The leak diagnosis device according to claim 1, characterized in that, The leak diagnostic device further includes an air filter, the inlet of which is connected to the atmosphere, and the outlet of which is connected to the first through hole.

7. An engine system, characterized in that, The engine system includes an engine, a fuel tank, and a leak diagnosis device as described in any one of claims 1 to 6, wherein the fuel tank is in communication with the second through hole.

8. A vehicle, characterized in that, Includes the engine system as described in claim 7.

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