CN215927580U - 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 pumping equipment, a one-way circulation element and a control valve. The air pumping device comprises a first air port and a second air port which are communicated, and the first air port is communicated with the atmosphere. The one-way flow element includes a first port and a second port, the first port communicating with the second port; the flow direction of the one-way flow element is the same as the flow direction of the air flow in the air pumping device. The control valve comprises a first interface, a second interface and a third interface; the first interface is used for being communicated with equipment to be diagnosed, the second interface is communicated with the atmosphere, and the third interface is communicated with the second port of the one-way circulation element; the control valve has a first state in which the first port is in communication with the second port and a second state; in the second state, the first port communicates with the third port.

Description

Leak diagnosis device, engine system, and vehicle

Technical Field

The present application relates to the field of vehicle technologies, and in particular, to a leakage diagnosis device, 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 whether the leakage amount of the oil tank 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 leakage diagnosis device comprises a first air port and a second air port which are communicated, and the first air port is communicated with the atmosphere;

a one-way flow element including a first port and a second port, the first port in communication with the second port; the flowing direction of the one-way flowing element is the same as the flowing direction of the air flow in the air pumping device;

a control valve including a first port, a second port, and a third port; the first interface is used for being communicated with equipment to be diagnosed, the second interface is communicated with the atmosphere, and the third interface is communicated with the second port of the one-way circulation element; the control valve has a first state in which the first port is in communication with the second port and a second state; in the second state, the first port communicates with the third port.

In one embodiment of the present application, the pumping device draws air in from the first port and discharges air from the second 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;

alternatively, the first and second electrodes may be,

the pumping device sucks air from the second air port and discharges the 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.

In one embodiment of the present application, the control valve is a solenoid valve; the first state is a power-off state and the second state is a power-on state.

In one embodiment of the present application, the one-way flow element comprises a one-way valve.

In one embodiment of the present application, the leak diagnosis apparatus further includes an air filter, an inlet of the air filter communicates with the atmosphere, and an outlet of the air filter communicates with the first air port and the second interface, respectively.

In one embodiment of the present application, the leak diagnostic apparatus further includes a first conduit communicating the second port with the first port, a second conduit communicating the second port with the third port, a third conduit communicating with the first port, a fourth conduit communicating atmospheric air with the first port;

the leak diagnosis apparatus further includes a heating member; the heating member is provided in the first pipe, the second pipe, the third pipe, the fourth pipe or the pumping device.

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

In one embodiment of the present application, the fuel evaporation system further includes a canister connected between the first port and the fuel tank, and the fuel tank is communicated with the first port through the canister.

In one embodiment of the present application, the leak diagnosis apparatus further includes a first conduit communicating the second gas port with the one-way flow element, a second conduit communicating the one-way flow element with the control valve, and a third conduit communicating the canister with the first port; the engine system further comprises a fifth pipeline communicating the carbon tank with the oil tank;

the engine system further comprises an air pressure sensor, and the air pressure sensor is arranged on the second pipeline, the third pipeline or the fifth pipeline.

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, when the control valve is in the second state, the first interface and the third interface of the control valve are communicated, the air pumping equipment is communicated with the equipment to be diagnosed through the one-way circulation element and the control valve, and the air pumping equipment pumps air to the equipment to be diagnosed or inhales air from the equipment to be diagnosed; if the air pumping equipment pumps air to the equipment to be diagnosed, the one-way circulation element can prevent the air from flowing out of the equipment to be diagnosed after the air pumping equipment stops working; if the pumping equipment sucks air from the equipment to be diagnosed, the one-way circulation element can prevent air from entering the equipment to be diagnosed after the pumping equipment stops working; by detecting the change of the air pressure in the equipment to be diagnosed, whether the equipment to be diagnosed has leakage exceeding the allowable range can be judged. And after the leakage diagnosis is finished, switching the control valve to the first state to enable the first interface to be communicated with the second interface, and enabling the equipment to be diagnosed to be communicated with the atmosphere to enable the pressure of the equipment to be diagnosed to be balanced with the atmospheric pressure. Therefore, the leakage diagnosis device provided by the embodiment of the application can diagnose whether the equipment to be diagnosed has leakage exceeding the allowable range or not by matching the control valve and the one-way flow element with the pumping equipment, has a simple structure, and is beneficial to reducing the cost of the leakage diagnosis device; in the process of leakage diagnosis, the control valve is only required to be operated, whether the equipment to be diagnosed leaks within the allowable range can be detected, the pressure of the equipment to be diagnosed is balanced with the atmospheric pressure after the detection is finished, and the method is simple to operate and easy to operate.

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 schematic view of a leak diagnostic apparatus provided in an exemplary embodiment of the present application in a first state;

FIG. 2 is a schematic view of a leak diagnostic apparatus provided in an exemplary embodiment of the present application in a second state;

FIG. 3 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 fuel evaporation 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. Referring to fig. 1 and 2, the leakage diagnosis apparatus 100 includes a pumping device 10, a one-way flow element 20, and a control valve 30.

The pumping device 10 comprises a first air port 11 and a second air port 12 which are communicated, and the first air port 11 is communicated with the atmosphere. The one-way flow-through element 20 includes a first port 201 and a second port 202, the first port 201 of the one-way flow-through element 20 is communicated with the second port 12, and the flow direction of the one-way flow-through element 20 is the same as the flow direction of the air flow in the air pumping device 10. The flowing direction of the one-way flowing element 20 and the flowing direction of the air flow in the air pumping device 10 are the same, that is, the one-way flowing element 20 is communicated with the air pumping device 10; when the pumping device 10 sucks air from the atmosphere, the gas flows from the first air port 11 to the second air port 12, and the flow direction of the one-way flow element 20 is the direction in which the first port 201 flows to the second port 202; when the pumping device 10 exhausts to the atmosphere, the gas flows from the second gas port 12 to the first gas port 11, and the flow direction of the one-way flow element 20 is the direction in which the second port 202 flows to the first port 201.

The control valve 30 comprises a first port 31, a second port 32 and a third port 33; the first port 31 is used for communicating with a device to be diagnosed, the second port 32 is communicated with the atmosphere, and the third port 33 is communicated with the second port 202 of the one-way circulation element 20. The control valve 30 has a first state and a second state. As shown in fig. 1, in the first state, the first interface 31 is communicated with the second interface 32, so that air in the atmosphere can enter the device to be diagnosed through the second interface 32 and the first interface 31; in the second state, as shown in fig. 2, the first interface 31 is communicated with the third interface 33, and the air pumping device can pump air in the atmosphere into the device to be diagnosed, or the air pumping device can suck air from the device to be diagnosed.

In the leakage diagnosis device provided by the embodiment of the application, when the control valve 30 is in the second state, the first port 31 of the control valve 30 is communicated with the third port 33, the pumping device 10 is communicated with the device to be diagnosed through the one-way flow element 20 and the control valve 30, and the pumping device pumps air to the device to be diagnosed or inhales air from the device to be diagnosed; if the air pumping device pumps air to the device to be diagnosed, the one-way circulation element 20 can prevent the air from flowing out of the device to be diagnosed after the air pumping device stops working; if the pumping equipment sucks air from the equipment to be diagnosed, the one-way circulation element 20 can prevent air from entering the equipment to be diagnosed after the pumping equipment stops working; by detecting the change of the air pressure in the equipment to be diagnosed, whether the equipment to be diagnosed has leakage exceeding the allowable range can be judged. After the leakage diagnosis is finished, the control valve is switched to the first state, the first interface 31 is communicated with the second interface 32, the equipment to be diagnosed is communicated with the atmosphere, and the pressure of the equipment to be diagnosed is balanced with the atmospheric pressure. Therefore, the leakage diagnosis device provided by the embodiment of the application can diagnose whether the equipment to be diagnosed has leakage exceeding the allowable range or not by matching the control valve and the one-way flow element with the pumping equipment, has a simple structure, and is beneficial to reducing the cost of the leakage diagnosis device; in the process of leakage diagnosis, the control valve is only required to be operated, whether the equipment to be diagnosed leaks within the allowable range can be detected, the pressure of the equipment to be diagnosed is balanced with the atmospheric pressure after the detection is finished, and the method is simple to operate and easy to operate.

In one embodiment, the pumping device 10 sucks air from the first air port 11 and discharges air from the second air port 12; the first port 201 of the one-way flow element 20 is an inlet and the second port 202 of the one-way flow element 20 is an outlet. So set up, the air pumping device 10 sucks in from the atmosphere, and pump the sucked air into the device to be diagnosed through the one-way circulation element 20 and the control valve 30, the air pressure in the device to be diagnosed rises gradually; when the air pressure in the equipment to be diagnosed rises to the first threshold range, the air pumping equipment 10 stops pumping air to the equipment to be diagnosed, the one-way circulation element 20 can prevent the air in the equipment to be diagnosed from flowing into the atmosphere, and the accuracy of diagnosis can be guaranteed; then, detecting the pressure change in the equipment to be diagnosed in real time to obtain a pressure change curve of the equipment to be diagnosed, and determining the pressure change speed of the equipment to be diagnosed and the leakage rate of the equipment to be diagnosed by the processor according to the pressure change curve of the equipment to be diagnosed; and comparing the leakage amount of the equipment to be diagnosed with the reference leakage amount to judge whether the equipment to be diagnosed has leakage within an allowable range. The first threshold range may be determined according to the maximum pressure that the device to be diagnosed can bear, for example, the maximum pressure that the device to be diagnosed can bear is 3.5kPa, and the first threshold range may be 3kPa to 3.2 kPa.

In another embodiment, the pumping device 10 sucks air from the second air port 12 and discharges the air from the first air port 11 to the atmosphere; the first port 201 of the one-way flow element 20 is an outlet and the second port 202 of the one-way flow element 20 is an inlet. So configured, the air pumping device 10 sucks air from the device to be diagnosed through the control valve 30 and the one-way circulation element 20, and discharges the sucked air to the atmosphere, and the air pressure in the device to be diagnosed is gradually reduced; when the air pressure in the equipment to be diagnosed is reduced to the second threshold range, the air pumping equipment 10 stops sucking air from the equipment to be diagnosed, the one-way circulation element 20 can prevent air in the atmosphere from entering the equipment to be diagnosed, and the accuracy of diagnosis can be guaranteed; then, detecting the pressure change in the equipment to be diagnosed in real time to obtain a pressure change curve of the equipment to be diagnosed, and determining the pressure change speed of the equipment to be diagnosed and the leakage rate of the equipment to be diagnosed by the processor according to the pressure change curve of the equipment to be diagnosed; and comparing the leakage amount of the equipment to be diagnosed with the reference leakage amount to judge whether the equipment to be diagnosed has leakage within an allowable range.

In one embodiment, the control valve 30 is a solenoid valve; the first state is a power-off state and the second state is a power-on state. With such an arrangement, the state switching of the control valve 30 can be realized by controlling the power-on and power-off of the electromagnetic valve, and the control valve 30 is relatively simple and easy to operate.

In one embodiment, the one-way flow element 20 comprises a one-way valve. In the illustrated embodiment, the one-way flow element 20 includes one-way valve, and in other embodiments, the one-way flow element 20 may include two or more one-way valves. So configured, the one-way flow-through element 20 is readily available.

In one embodiment, the leakage diagnosis apparatus 100 further includes an air filter 40, an inlet of the air filter 40 is communicated with the atmosphere, and an outlet of the air filter 40 is communicated with the first air port 11 and the second interface 32, respectively. With the arrangement, air in the atmosphere firstly passes through the air filter 40 and then enters the air pumping device 10 and the control valve 30, and the air filter 40 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 40 is a dust filter that filters dust from air.

In one embodiment, referring to fig. 2, the leakage diagnosis apparatus 100 further includes a first pipe 51 communicating the second air port 12 with the first port 201 of the one-way flow element 20, a second pipe 52 communicating the second port 202 of the one-way flow element 20 with the third port 33, a third pipe 53 communicating with the first port 31, and a fourth pipe 54 communicating with the atmosphere and the first air port 11, the third pipe 53 being used for communicating with a device to be diagnosed, and the fourth pipe 54 being capable of connecting the first air port 11 with the air filter 40. So set up, be convenient for between the adjacent part the intercommunication.

The leak diagnosis apparatus 100 further includes a heating member (not shown) provided in the first pipe 51, the second pipe 52, the third pipe 53, the fourth pipe 54, or the pumping device 10. Because the density of the gas at different temperatures is different, the leakage rate of the equipment to be diagnosed is constant, and the change speed of the air pressure in the equipment to be diagnosed is different at different temperatures, so that the judgment of the leakage rate of the equipment to be diagnosed is influenced. Through setting up the heating member, the heating member can heat the gas of the pipeline of flowing through, makes the air that gets into in the equipment of treating the diagnosis reach appointed temperature, and the reference of the equipment of treating the diagnosis is let out the leakage quantity and is also surveyed under appointed temperature, so can avoid the temperature to the influence of the leakage quantity of the equipment of treating the diagnosis that detects, can promote the diagnostic precision of leaking. In some embodiments, the heating element may be a thermistor.

The embodiment of the application also provides an engine system. Referring to fig. 3, the engine system includes an engine 24, a fuel tank 21, and the leakage diagnosis apparatus 100 according to any of the above embodiments, wherein the fuel tank 21 is communicated with the first port 31, and the fuel tank 21 is communicated with an intake manifold of the engine 24.

In the engine system provided by the embodiment of the application, when the oil tank needs to be diagnosed whether leakage exceeding an allowable range exists, the control valve 30 is switched to the second state, and the first interface 31 and the third interface 33 of the control valve 30 are communicated; the pumping device 10 pumps air into the tank 21 or sucks air from the tank 21, and determines whether or not there is leakage outside the allowable range from a change in the air pressure in the tank 21 after the pumping or the suction is stopped. When the engine is running, the control valve 30 is switched to the first state, the first interface 31 and the second interface 32 of the control valve 30 are communicated, air in the atmosphere can enter the oil tank through the control valve 30 and is mixed with gasoline steam in the oil tank, and the mixture enters the engine 24. From the above analysis, the device to be diagnosed can diagnose whether the fuel tank 21 has a leakage exceeding an allowable range, and the device to be diagnosed does not affect the air entering the fuel tank when the engine is running.

In one embodiment, the fuel tank 21 is directly communicated with an intake manifold of the engine 24, the engine system further comprises a check valve 26 connected between the fuel tank 21 and the engine 24, an inlet of the check valve 26 is communicated with the fuel tank 21, an outlet of the check valve 26 is communicated with the intake manifold of the engine 24, and fuel vapor in the fuel tank 21 can enter the engine 24 through the check valve 26. The provision of the check valve 26 prevents the fuel vapor from flowing back into the fuel tank 21.

In one embodiment, the engine system further comprises a carbon canister 22, the carbon canister 22 is connected between the first interface 31 and the oil tank 21, and the oil tank 21 is communicated with the first interface 31 through the carbon canister 22. Through setting up carbon tank 22, when the engine stalled, the petrol steam in the oil tank 21 entered into carbon tank 22, and the active carbon in carbon tank 22 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 22 enter the intake manifold of the engine. The leak diagnosis apparatus 100 can diagnose whether or not the canister 22 and the tank 21 have leaks outside the allowable range.

In one embodiment, referring to FIG. 3, the engine system further includes a canister purge valve 27, the canister purge valve 27 being connected between the canister 22 and the intake manifold of the engine 24. A canister purge valve 27 communicating the canister 22 with the engine 24 when the engine 24 is started, gas in the canister 22 entering the engine 24 through the canister purge valve 27; in the leak diagnosis, the canister purge valve 27 is closed, the engine 24 is not communicated with the canister 22, and the leak diagnosis apparatus 100 detects whether or not there is a leak outside the allowable range in the canister 22 and the oil tank 21.

In one embodiment, the engine system further comprises a fifth conduit 29 communicating the canister 22 with the oil tank 21. The engine system further includes an air pressure sensor 23, and the air pressure sensor 23 is disposed on the second pipe 52, the third pipe 53, or the fifth pipe 29. In the leak diagnosis, the gas pressures in the canister 22, the tank 21, the fifth pipe 29, the third pipe 53, and the second pipe 52 are the same, the gas pressure is detected by the gas pressure sensor 23, and it is possible to determine whether or not there is a leak outside the allowable range in the tank 21, the canister 22, and the fifth pipe 29 based on the pressure detected by the gas pressure sensor 23. In the illustrated embodiment, the air pressure sensor 23 is provided on the fifth pipe 29. In other embodiments, the air pressure sensor 23 may be disposed at the second duct 52 or the third duct 53.

In one embodiment, the engine system further includes a throttle 28, the inlet of the throttle 28 being in communication with the atmosphere and the outlet being in communication with the intake manifold of the engine. The throttle 28 may control the amount of air that enters the engine 24.

In one embodiment, the engine system further includes an exhaust system 25, and the exhaust system 25 is configured to exhaust gases emitted during operation of the engine 24, and may reduce pollution and noise of the exhaust gases.

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:

the air pumping device (10) comprises a first air port (11) and a second air port (12) which are communicated, and the first air port is communicated with the atmosphere;

a one-way flow-through element (20) comprising a first port (201) and a second port (202), the first port (201) communicating with the second port (12); the flowing direction of the one-way flowing element is the same as the flowing direction of the air flow in the air pumping device;

a control valve (30) comprising a first interface (31), a second interface (32) and a third interface (33); the first interface (31) is used for communicating with a device to be diagnosed, the second interface (32) is communicated with the atmosphere, and the third interface (33) is communicated with the second port (202) of the one-way circulation element; the control valve (30) having a first state in which the first port (31) communicates with the second port (32) and a second state; in the second state, the first port (31) communicates with the third port (33).

2. The leak diagnosis device according to claim 1, wherein the pumping means sucks in air from the first port (11) and discharges air from the second port (12); the first port (201) of the one-way flow-through element is an inlet, and the second port (202) of the one-way flow-through element is an outlet;

alternatively, the first and second electrodes may be,

the pumping device sucks air from the second air port (12) and discharges the air to the atmosphere from the first air port (11); the first port (201) of the one-way flow element is an outlet and the second port (202) of the one-way flow element is an inlet.

3. The leak diagnostic apparatus according to claim 1, wherein the control valve is a solenoid valve; the first state is a power-off state and the second state is a power-on state.

4. The leak diagnostic apparatus according to claim 1, wherein the one-way flow element (20) comprises a one-way valve.

5. The leak diagnosis device according to claim 1, further comprising an air filter (40) having an inlet communicating with the atmosphere and an outlet communicating with the first port (11) and the second port (32), respectively.

6. The leak diagnosis device according to claim 1, further comprising a first conduit (51) communicating the second port (12) with the first port (201), a second conduit (52) communicating the second port (202) with the third port (33), a third conduit (53) communicating with the first port (31), and a fourth conduit (54) communicating atmospheric air with the first port;

the leak diagnosis apparatus further includes a heating member; the heating member is provided in the first pipe (51), the second pipe (52), the third pipe (53), the fourth pipe (54), or the pumping device.

7. An engine system, characterized in that the engine system comprises an engine (24), a fuel tank (21) and the leak diagnosis device according to any one of claims 1 to 6, the fuel tank being in communication with the first interface.

8. The engine system according to claim 7, further comprising a canister (22), the canister (22) being connected between the first port (31) and the oil tank (21), the oil tank (21) being in communication with the first port (31) through the canister (22).

9. The engine system according to claim 8, characterized in that the leak diagnosis device further includes a first conduit (51) communicating the second port (12) with the first port (201), a second conduit (52) communicating the second port (202) with the third interface (33), and a third conduit (53) communicating with the first interface (31); the engine system further comprises a fifth conduit (29) communicating the canister (22) with the oil tank (21);

the engine system further comprises an air pressure sensor (23), the air pressure sensor (23) being provided to the second duct (52), the third duct (53) or the fifth duct (29).

10. A vehicle characterized in that it comprises an engine system according to claim 8 or 9.

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