CN116026533B - Diagnostic system and diagnostic method - Google Patents
Diagnostic system and diagnostic method Download PDFInfo
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- CN116026533B CN116026533B CN202310309511.0A CN202310309511A CN116026533B CN 116026533 B CN116026533 B CN 116026533B CN 202310309511 A CN202310309511 A CN 202310309511A CN 116026533 B CN116026533 B CN 116026533B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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Abstract
The invention discloses a diagnosis system and a diagnosis method. The main body of the switching device is provided with a sliding space, a movable valve is arranged in the sliding space, the movable valve is provided with a first direction changing position, a second direction changing position and a third direction changing position, and the main body is provided with a first branch, a second branch and a detection branch; the detection branch is provided with a pressure detection component, and the movable valve is switched to different changing positions after moving relative to the detection branch, the first branch and the second branch, so that the detection branch, the first branch and the second branch are in different communication modes. The pressure detection component is used for detecting the pressure value of a first closed circuit when the movable valve is in a first change position; the pressure detection component is used for detecting the pressure value of a second closed circuit when the movable valve is in a second change position; the pressure detecting means is for detecting a pressure value of the third closed circuit when the traveling valve is in the third shift position. The switching device is used for sectional diagnosis of the fuel oil pipeline, and can improve the accuracy of leakage diagnosis.
Description
Technical Field
The present invention relates to the field of vehicle detection technologies, and in particular, to a switching device, a diagnostic system, and a diagnostic method.
Background
In the prior art, in the leakage diagnosis system of an automobile, every time when the leakage diagnosis is carried out, a fuel tank and a carbon tank are communicated, then an air pump arranged on a pipeline between the carbon tank and the outside atmosphere is used for pumping air to the fuel tank and a system in the carbon tank, after the air pump is stabilized, detection data of a pressure sensor arranged on the pipeline between the carbon tank and the outside atmosphere are read, after a period of time, detection data of the pressure sensor are read again, and whether the system between the fuel tank and the carbon tank leaks or not is judged through pressure drop.
There is a problem in that, when there is a leak, the above leak diagnosis system cannot diagnose whether there is a leak on the canister side or a leak on the tank side, resulting in failure to accurately determine the leak position.
Disclosure of Invention
The invention aims to provide a switching device, a diagnosis system and a diagnosis method, which are used for sectional diagnosis of a fuel pipeline, so that the accuracy of leakage diagnosis is improved.
The invention adopts the following technical scheme:
a switching device, comprising:
the sliding device comprises a main body, a sliding space and a valve body, wherein a movable moving valve is arranged in the sliding space, and the moving valve is provided with a first displacement position, a second displacement position and a third displacement position;
a first branch, a second branch and a detection branch for fluid circulation are arranged on or in the main body, a pressure detection component is arranged on the detection branch, and the movable valve is switched to different reversing positions after moving relative to the detection branch, the first branch and the second branch so that the detection branch, the first branch and the second branch are in different communication modes;
when the movable valve is in the first change position, a first closed circuit is formed between the movable valve and the detection branch and between the movable valve and the first branch, and the second branch is cut off, and the pressure detection component is used for detecting the pressure value of the first closed circuit;
when the movable valve is in the second change position, a second closed circuit is formed between the movable valve and the detection branch and between the movable valve and the second branch, and the first branch is cut off, and the pressure detection component is used for detecting the pressure value of the second closed circuit;
when the movable valve is in the third switching position, a third closed circuit is formed among the movable valve, the detection branch, the first branch and the second branch, and the pressure detection component is used for detecting the pressure value of the third closed circuit.
Preferably, the detection branch comprises a first detection branch and a second detection branch, wherein the first detection branch is used for communicating with the first branch, and the second detection branch is used for communicating with the second branch;
the moving valve is provided with a multi-section sealing part and a multi-section ventilation part, wherein the sealing part is used for isolating the first detection branch from the first branch or isolating the second detection branch from the second branch, and the ventilation part is used for communicating the first detection branch with the first branch or communicating the second detection branch with the second branch.
Preferably, the multi-stage ventilation part comprises a first ventilation part, a second ventilation part and a third ventilation part which are arranged on the moving valve at intervals, one sealing part is arranged between the first ventilation part and the second ventilation part, and one sealing part is arranged between the second ventilation part and the third ventilation part.
Preferably, the lengths of the first ventilation part, the second ventilation part and the sealing part along the length direction of the moving valve are the same, and the length of the third ventilation part along the length direction of the moving valve is greater than the length of the first ventilation part along the length direction of the moving valve.
Preferably, the method further comprises: the sliding space is provided with a sliding space, a sliding valve control part and an elastic part, wherein the sliding valve control part is used for controlling the sliding valve to move in the sliding space to switch to different reversing positions, the elastic part is used for applying a reset acting force to the sliding valve, and the reset acting force is opposite to the acting force applied to the sliding valve by the sliding valve control part.
A diagnostic system comprising a switching device according to any one of the preceding claims.
Preferably, the diagnostic system further comprises:
the oil tank is connected with the first branch;
the carbon tank is connected with the second branch and is also communicated with the outside through a first pipeline, and a first communication valve is arranged on the first pipeline;
the engine is communicated with the carbon tank through a second pipeline, and a second communication valve is arranged on the second pipeline;
and a controller for controlling the movement of the moving valve, the first and second communication valves, and acquiring a pressure value of the pressure detecting part.
Preferably, a pressure relief pipeline is communicated between the first branch and the second branch, a pressure limiting valve is arranged on the pressure relief pipeline in a communicated mode, and the pressure limiting valve is used for releasing the pressure in the oil tank to one side of the carbon tank when the pressure in the oil tank is higher than a preset pressure.
A diagnostic method using the diagnostic system of any one of the above.
Preferably, when in the leak diagnosis mode, the diagnosis method includes:
the engine is started, the controller controls the first communication valve to be closed and the second communication valve to be opened, the controller controls the moving valve to move to the third direction changing position to form the third closed circuit, and the oil tank is communicated with the carbon tank;
the engine is used for exhausting, and when the pressure in the third closed circuit reaches a preset pressure value, the controller controls the second communication valve to be closed;
in a preset time period, judging whether leakage exists between the oil tank and the carbon tank and between the carbon tank and the second communication valve through pressure change of the pressure detection component, or the controller firstly controls the moving valve to move to the first switching position, then in the preset time period, judging whether leakage exists between the oil tank and the switching device through pressure change of the pressure detection component, or the controller firstly controls the moving valve to move to the second switching position, and then in the preset time period, judging whether leakage exists between the carbon tank and the switching device through pressure change of the pressure detection component.
Preferably, when in the desorption diagnostic mode, the diagnostic method comprises: the engine is started, the controller controls the first communication valve and the second communication valve to be opened, the controller controls the moving valve to move to the second change position to form the second closed circuit, and whether desorption exists in the carbon tank is judged according to whether fluctuation exists in pressure of the pressure detection part in a preset time period.
Preferably, the diagnostic system is applied to a hybrid vehicle, and the controller controls the traveling valve to move to the first shift position or the second shift position when in the pure electric mode, and the first communication valve and the second communication valve are both closed.
Preferably, when the engine is closed and in a refueling mode, the controller controls the first communication valve to be opened, and the controller controls the moving valve to move to the third direction change, so as to form the third closed circuit and refuel; and after the fuel tank cover is closed after the fuel is filled, the controller controls the movable valve to move to the first shifting position or the second shifting position.
Compared with the prior art, the invention has the beneficial effects that at least:
the switching device can have three different working states by adjusting the position of the movable valve.
According to the diagnosis system, the sectional type leakage diagnosis of the fuel oil pipeline is realized through the switching device, so that the accuracy of the leakage diagnosis is improved.
The leakage diagnosis method of the invention provides a working method when the vehicle is in four different modes, and further enriches the purposes and functions of the diagnosis system.
Drawings
Fig. 1 is a schematic structural diagram of a switching device according to an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view of a switching device according to an embodiment of the invention in a first switching position.
FIG. 3 is a schematic cross-sectional view of a switching device according to an embodiment of the present invention in a second switching position.
Fig. 4 is a schematic cross-sectional view of a switching device according to an embodiment of the invention in a third switching position.
Fig. 5 is a schematic diagram of the structure of a diagnostic system according to an embodiment of the present invention.
In the figure: 1. a switching device; 10. a main body; 101. a first body; 102. a second body; 103. a first branch; 104. a second branch; 11. a sliding space; 111. a first sliding space; 112. a second sliding space; 12. a moving valve; 121. a first ventilation unit; 122. a second ventilation unit; 123. a third ventilation part; 124. a sealing part; 13. a detection branch; 131. a first detection branch; 132. a second detection branch; 14. a pressure detecting section; 15. a moving valve control part; 16. an elastic member; 2. an oil tank; 3. a carbon tank; 30. a first pipeline; 31. a first communication valve; 4. an engine; 40. a second pipeline; 41. a second communication valve; 5. a controller; 6. a pressure relief pipeline; 60. a pressure limiting valve.
Description of the embodiments
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a repetitive description thereof will be omitted.
The words expressing the positions and directions described in the present invention are described by taking the drawings as an example, but can be changed according to the needs, and all the changes are included in the protection scope of the present invention.
Referring to fig. 1 to 4, the switching device 1 of the present invention includes a main body 10 and a pressure detecting member 14.
The main body 10 is provided with a sliding space 11, a movable moving valve 12 is arranged in the sliding space 11, the moving valve 12 is provided with a first position changing direction, a second position changing direction and a third position changing direction, and the first position changing direction, the second position changing direction and the third position changing direction can enable the switching device 1 to achieve three different working states.
The main body 10 or the main body 10 is further provided with a first branch 103, a second branch 104 and a detection branch 13 for fluid circulation, the first branch 103, the second branch 104 and the detection branch 13 can be openings arranged in the main body 10, the fluid can be gas, liquid or a gas-liquid mixture, the liquid can be fuel oil, for example, the openings of the first branch 103 and the second branch 104 can be arranged on the same side of the main body 10 and positioned on the outer wall of the main body 10, and can also be respectively arranged on two sides of the main body 10, in the embodiment, the openings of the first branch 103 and the second branch 104 are arranged on the same side of the main body 10, the first branch 103 and the second branch 104 can be communicated with the sliding space 11, and the opening of the detection branch 13 can be positioned on the outer wall of the main body 10.
The pressure detecting means 14 is provided on the detecting branch 13, and the pressure detecting means 14 may include a pressure sensor, and the pressure detecting means 14 is configured to detect a pressure value of the switching device 1, and may specifically be configured to obtain the pressure value in the detecting branch 13. The detection branch 13 is disposed in the main body 10, in a specific embodiment, the detection branch 13 includes a first detection branch 131 and a second detection branch 132, the first detection branch 131 is used for communicating with the first branch 103, the second detection branch 132 is used for communicating with the second branch 104, the first detection branch 131 and the second detection branch 132 are respectively communicated with the sliding space 11, and thus the first detection branch 131 is communicated with the first branch 103, and the second detection branch 132 is communicated with the second branch 104. The first detecting branch 131 and the first branch 103 are preferably on the same straight line, and the aperture of the first detecting branch 131 is approximately the same as that of the first branch 103; the second detecting branch 132 and the second branch 104 are preferably aligned, and the aperture of the second detecting branch 132 is substantially the same as the aperture of the second branch 104.
The moving valve 12 is movable relative to the detecting branch 13, the first branch 103 and the second branch 104 such that the moving valve 12 is in different positions of change, thereby placing the detecting branch 13, the first branch 103 and the second branch 104 in different communication modes.
Specifically, when the movable valve 12 is in the first shift position, a first closed circuit is formed between the movable valve 12 and the detection branch 13, the first branch 103, and the second branch 104 is blocked, and the pressure detection part 14 is configured to detect a pressure value of the first closed circuit.
When the movable valve 12 is in the second change position, a second closed circuit is formed between the movable valve 12 and the detecting branch 13 and between the movable valve 12 and the second branch 104, and the first branch 103 is closed, and the pressure detecting part 14 is used for detecting the pressure value of the second closed circuit.
When the movable valve 12 is in the third switching position, a third closed circuit is formed between the movable valve 12 and the detecting branch 13, the first branch 103 and the second branch 104, and the pressure detecting means 14 is configured to detect a pressure value of the third closed circuit.
Wherein the first branch 103 may be used for connecting the tank 2 and the second branch 104 may be used for connecting the canister 3, whereby a sectional leak diagnosis or a non-sectional leak diagnosis is achieved by the movement of the movable valve 12 and the switching of the reversing position, the details of the leak diagnosis being described later.
In a specific embodiment, referring to fig. 1, the main body 10 is a rectangular parallelepiped, the main body 10 may be composed of a first main body 101 and a second main body 102, the first main body 101 has a first sliding space 111 therein, the second main body 102 has a second sliding space 112 therein, and the movable valve 12 may slide left and right in the sliding space 11. The whole of the movable valve 12 is substantially cylindrical, but other shapes are possible, and the movable valve 12 is partially located in the first sliding space 111 and the movable valve 12 is partially located in the second sliding space 112. In the present embodiment, the detection branch 13, the first branch 103, and the second branch 104 are provided on the first body 101.
In the present embodiment, the moving valve 12 located in the second sliding space 112 has a plurality of sealing portions 124 and a plurality of ventilation portions, each sealing portion 124 can achieve a sealing effect with the second sliding space 112, the sealing portion 124 is used for isolating the first detecting branch 131 from the first branch 103 or isolating the second detecting branch 132 from the second branch 104, and the ventilation portion is used for communicating the first detecting branch 131 with the first branch 103 or communicating the second detecting branch 132 with the second branch 104.
In a specific embodiment, the multi-stage ventilation part includes a first ventilation part 121, a second ventilation part 122 and a third ventilation part 123, the first ventilation part 121, the second ventilation part 122 and the third ventilation part 123 are disposed on the moving valve 12 at intervals, for example, on the outer peripheral wall of the moving valve 12, respectively, a sealing part 124 is disposed between the first ventilation part 121 and the second ventilation part 122, a sealing part 124 is disposed between the second ventilation part 122 and the third ventilation part 123, the diameter of the first ventilation part 121, the diameter of the second ventilation part 122 and the diameter of the third ventilation part 123 are all smaller than the diameter of the second sliding space 112, and the diameter of the first ventilation part 121, the diameter of the second ventilation part 122 and the diameter of the third ventilation part 123 are preferably the same. Preferably, the lengths of the first ventilation part 121, the second ventilation part 122 and the sealing part 124 along the length direction of the moving valve 12 are the same, the length of the third ventilation part 123 along the length direction of the moving valve 12 is greater than the length of the first ventilation part 121 along the length direction of the moving valve 12, and the length of the third ventilation part 123 is approximately twice the length of the first ventilation part 121. In other embodiments, the first ventilation part 121, the second ventilation part 122, and the third ventilation part 123 may also be through holes provided at intervals on the moving valve 12.
Referring to fig. 2, when the movable valve 12 is in the first switching position, a first closed circuit is formed between the movable valve 12 and the detection branch 13 and between the movable valve 12 and the first branch 103, and the second branch 104 is blocked, the first ventilation portion 121 is located between the first branch 103 and the first detection branch 131, the first branch 103 and the first detection branch 131 can be communicated, the sealing portion 124 is located between the second branch 104 and the second detection branch 132, and the pressure detection portion 14 can detect the pressure value of the first closed circuit at this time.
Referring to fig. 3, when the movable valve 12 is in the second switching position, a second closed circuit is formed between the movable valve 12 and the detecting branch 13, the second branch 104, and the first branch 103 is blocked, the sealing portion 124 is between the first branch 103 and the first detecting branch 131, the first branch 103 and the first detecting branch 131 are blocked, the third air-through portion 123 is between the second branch 104 and the second detecting branch 132, the second branch 104 and the second detecting branch 132 can be communicated, and the pressure detecting member 14 is used for detecting the pressure value of the second closed circuit.
Referring to fig. 4, when the traveling valve 12 is in the third shift position, a third closed circuit is formed between the traveling valve 12 and the detection branch 13, the first branch 103 and the second branch 104, the second ventilation portion 122 is located between the first branch 103 and the first detection branch 131, the first branch 103 and the first detection branch 131 can communicate with each other, the third ventilation portion 123 is located between the second branch 104 and the second detection branch 132, the second branch 104 and the second detection branch 132 can communicate with each other, and the pressure detecting section 14 is configured to detect a pressure value of the third closed circuit.
In a specific embodiment, the second body 102 is further provided with a moving valve control member 15, and the moving valve control member 15 is used for controlling the moving valve 12 to move left and right in the sliding space 11, so that the moving valve 12 is in the first, second or third changing position. The moving valve control member 15 may be a conventional technique, and in this embodiment, the moving valve control member 15 may be a device having a magnetic attraction force, and at least one end of the moving valve 12 near the moving valve control member 15 is made of a magnetic attraction material. The first sliding space 111 has two parts including a large diameter and a small diameter, the part near the moving valve control member 15 has a small diameter, the part far from the moving valve control member 15 has a large diameter, an elastic member 16 is disposed in the first sliding space 111 far from the moving valve control member 15, the elastic member 16 is sleeved on the moving valve 12, and the elastic member 16 may be a spring. The elastic member 16 is configured to apply a restoring force to the traveling valve 12, which is opposite to the force applied to the traveling valve 12 by the traveling valve control member 15. As an example, when the magnetic attraction force applied to the traveling valve 12 by the traveling valve control member 15 increases, the traveling valve 12 slides in the direction of the traveling valve control member 15 by the magnetic attraction force of the traveling valve control member 15, and the elastic member 16 is compressed and generates a restoring force; when the magnetic attraction force applied to the traveling valve 12 by the traveling valve control member 15 is reduced, the traveling valve 12 slides in a direction away from the traveling valve control member 15 by the elastic force of the elastic member 16. By changing the magnetic attraction force applied to the traveling valve 12 by the traveling valve control member 15, the traveling valve 12 is controlled to move left and right in the sliding space 11, thereby realizing that the traveling valve 12 is in the first shift position or the second shift position or the third shift position.
The invention also provides a diagnostic system for a vehicle comprising a switching device 1 as described above, which diagnostic system is particularly suitable for a hybrid vehicle having a pure electric mode and a conventional fuel mode in which the fuel engine 4 is started.
In one embodiment, referring to fig. 5, the diagnostic system further includes a fuel tank 2, a carbon canister 3, an engine 4, and a controller 5.
Specifically, the first branch 103 is connected to the oil tank 2, the second branch 104 is connected to the carbon tank 3, accessible pipe connection between oil tank 2 and the first branch 103, accessible pipe connection between carbon tank 3 and the second branch 104, carbon tank 3 still communicates with the external world through first pipeline 30, be provided with first communication valve 31 on the first pipeline 30, first communication valve 31 is used for controlling the break-make of first pipeline 30, the intercommunication has second pipeline 40 between engine 4 and the carbon tank 3, be provided with second communication valve 41 on the second pipeline 40, second communication valve 41 is used for controlling the break-make of second pipeline 40, first communication valve 31 and second communication valve 41 all can be the solenoid valve. The controller 5 may be an electronic control unit (Electronic Control Unit, abbreviated as ECU) or a fuel control module (Fuel Control Module, abbreviated as FCM) of the vehicle, the controller 5 is configured to control the movement of the moving valve 12 to be in different positions, the controller 5 may also control the opening and closing of the first communication valve 31, the controller 5 may also control the opening and closing of the second communication valve 41, and may also acquire the pressure value of the pressure detecting component 14.
When the mobile valve 12 is in the first switching position, the tank 2 is in communication with the first closed circuit, the pressure detection means 14 being able to detect the pressure value between the tank 2 and the switching device 1, which pressure value is also the pressure value in the tank 2, by means of which a diagnosis of a leak in the tank 2, between the tank 2 and the switching device 1, is made.
When the mobile valve 12 is in the second switching position, the canister 3 is in communication with the second closed circuit, and the pressure detecting means 14 can detect the pressure value between the canister 3 and the switching device 1, which pressure value is also the pressure value in the canister 3, by means of which it can be diagnosed whether there is a leak in the canister 3, between the canister 3 and the switching device 1.
When the traveling valve 12 is in the third switching position, the tank 2, the canister 3 and the third closed circuit are communicated, and the pressure detecting means 14 can detect the pressure values in the tank 2, in the canister 3 and between the tank 2, the canister 3 and the switching device 1, by which it is possible to diagnose whether or not there is a leak between the tank 2, the canister 3 and the switching device 1.
In the pure electric mode of the hybrid electric vehicle, when the movable valve 12 is in the first change position or the second change position, the switching device 1 cuts off the communication between the oil tank 2 and the carbon tank 3, so that the switching device 1 has the function of an oil tank isolation valve; in the refueling mode, when the movable valve 12 is in the third direction, the switching device 1 enables the fuel tank 2 to be communicated with the carbon tank 3, if the pressure in the fuel tank 2 exceeds the preset pressure at this time, the pressure can be released to one side of the carbon tank 3, and if the pressure in the fuel tank 2 is smaller than the preset pressure at this time, the air can be supplemented into the fuel tank 2, so that the fuel tank cover can be opened, and the pressure balance in the fuel tank 2 can be realized.
In a specific embodiment, a pressure relief pipeline 6 is communicated between the first branch 103 and the second branch 104, and a pressure limiting valve 60 is arranged on the pressure relief pipeline 6 in a communicated manner, wherein the pressure limiting valve 60 is used for releasing the pressure in the oil tank 2 to one side of the carbon tank 3 when the pressure in the oil tank 2 is higher than a preset pressure. Specifically, in order to improve the use safety of the oil tank 2, when the pressure in the oil tank 2 is too high, the pressure in the oil tank 2 will enter the pressure relief pipeline 6, and then the pressure limiting valve 60 on the pressure relief pipeline 6 is pushed open, and the pressure limiting valve 60 may be a one-way mechanical valve, so that the pressure in the oil tank 2 can be released to one end of the carbon tank 3, thereby ensuring the safety and reliability of the oil tank 2.
The invention also provides a diagnosis method which uses the diagnosis system.
When the vehicle is in different states, the diagnosis methods are different, and the invention provides a control method and a working mode when the vehicle is in four states, which correspond to a leakage diagnosis mode, a desorption diagnosis mode, a pure electric mode and a refueling mode of the hybrid vehicle respectively, and the working process of each mode is described in detail below.
When the vehicle is in the leak diagnosis mode, the leak diagnosis method includes: steps S11-S13.
Step S11: the engine 4 is started, the controller 5 controls the first communication valve 31 to be closed and the second communication valve 41 to be opened, a closed space is formed among the oil tank 2, the carbon tank 3 and the second pipeline 40, the controller 5 controls the movable valve 12 to move to the third direction change to form the third closed circuit, and the oil tank 2 is communicated with the carbon tank 3.
Step S12: the engine 4 is pumped, the closed space among the oil tank 2, the carbon tank 3 and the second pipeline 40 forms negative pressure, and when the pressure (negative pressure value) in the third closed circuit reaches a preset pressure value, the controller 5 controls to close the second communication valve 41, and the closed space among the oil tank 2, the carbon tank 3 and the second pipeline 40 forms certain vacuum.
Step S13: in the preset period of time, for example, 60s or 2min, it is determined whether there is a leak between the tank 2 and the canister 3 and between the canister 3 and the second communication valve 41 by the pressure change of the pressure detecting member 14, for example, the pressure value of the pressure detecting member 14 acquired by the controller 5 is gradually changed from negative to positive, it is determined that there is a leak in the diagnostic system, and if the pressure value of the pressure detecting member 14 is unchanged or substantially unchanged, it is determined that there is no leak in the diagnostic system, thereby achieving the diagnosis of the leak in the diagnostic system as a whole.
Alternatively, the controller 5 controls the moving valve 12 to move to the first displacement position, and then, in a preset period of time, for example, 60s or 2min, the pressure change of the pressure detecting component 14 is used to determine whether there is a leak between the fuel tank 2 and the switching device 1, for example, the pressure value of the pressure detecting component 14 acquired by the controller 5 is gradually changed from negative to positive, so that it may be determined that there is a leak in the fuel tank 2 or between the fuel tank 2 and the switching device 1, and if the pressure value of the pressure detecting component 14 is unchanged or substantially unchanged, it may be determined that there is no leak in the fuel tank 2 or between the fuel tank 2 and the switching device 1, thereby realizing the leak detection of the fuel tank 2 and the switching device 1.
Alternatively, the controller 5 controls the moving valve 12 to move to the second shift position, and then, in a preset period of time, for example, 60s or 2min, the pressure change of the pressure detecting component 14 is used to determine whether there is a leak between the canister 3 and the switching device 1, for example, the pressure value of the pressure detecting component 14 acquired by the controller 5 is gradually changed from negative to positive, so that it may be determined that there is a leak in the canister 3 or between the canister 3 and the switching device 1, and if the pressure value of the pressure detecting component 14 is unchanged or substantially unchanged, it may be determined that there is no leak in the canister 3 or between the canister 3 and the switching device 1, thereby realizing the leak detection of the canister 3 and the switching device 1.
By adopting the diagnosis method, not only the whole leakage diagnosis in the diagnosis system can be realized, but also the sectional diagnosis between the oil tank 2 and the carbon tank 3 can be realized, thereby improving the accuracy of the leakage diagnosis.
The pressure value of the pressure detecting unit 14 is substantially unchanged and can be determined by previously setting a section in which the pressure value changes; in addition, in the above diagnostic process, the pressure change of the pressure detecting member 14 can also be determined by plotting a curve and comparing the curve with a standard leakage curve.
In one particular application, when the vehicle is in a leak diagnostic mode, the leak diagnostic method may include: steps S111-S116.
Step S111: the engine 4 is started and in a stable condition, and both the first communication valve 31 and the second communication valve 41 are in an open state.
Step S112: the controller 5 controls the traveling valve 12 to move to the third change position to form a third closed circuit, thereby exhausting the inside of the tank 2.
Step S113: when the pressure in the oil tank 2 is lower than the preset pressure value, the first communication valve 31 is closed, so that the engine 4 pumps the internal pipelines of the diagnosis system, the oil tank 2 and the carbon tank 3 to form negative pressure.
Step S114: when the pressure in the diagnostic system reaches a preset pressure value, the controller 5 controls to close the second communication valve 41.
Step S115: in the preset time period, for example, 60s or 2min, whether leakage exists in the diagnosis system is judged through pressure change, and if the preset pressure value is not reached, the controller 5 judges that leakage exists in the internal pipeline of the diagnosis system, the carbon tank 3 and the oil tank 2.
Alternatively, as shown in step S13, the controller 5 first controls the moving valve 12 to move to the first shift position, and then, during a preset period of time, the controller 5 determines whether there is a leak between the tank 2 and the switching device 1 through the pressure change of the pressure detecting member 14, thereby realizing leak detection of the tank 2 and the switching device 1.
Alternatively, the controller 5 controls the moving valve 12 to move to the second shift position, and then the controller 5 judges whether or not there is a leak between the canister 3 and the switching device 1 by the pressure change of the pressure detecting means 14 in a preset period of time, thereby realizing leak detection of the canister 3 and the switching device 1.
Step S116: after the diagnosis is completed, the controller 5 controls the movable valve 12 to be moved to the first change position or the second change position, isolates the tank 2 from the canister 3, and controls the first communication valve 31 to be opened.
When the vehicle is in the desorption diagnosis mode, the desorption diagnosis method includes: the engine 4 is started, the controller 5 controls the first communication valve 31 and the second communication valve 41 to be opened, the controller 5 controls the moving valve 12 to move to the second changing position to form the second closed circuit, at this time, the pressure detecting part 14 detects the pressure value of the section of the carbon tank 3 and the switching device 1, and in a preset time period, whether the carbon tank 3 is desorbed or not is judged by whether the pressure of the pressure detecting part 14 fluctuates or not.
Specifically, if desorption is normally performed, the pressure value of the section of the canister 3 and the switching device 1 inevitably fluctuates when the engine 4 is operated, reflecting the change in the pressure value of the pressure detecting means 14; if desorption is not normally performed, the pressure value of the carbon canister 3 and the section of the switching device 1 will not fluctuate during operation of the engine 4, and the pressure value is reflected on the change of the pressure value of the pressure detecting means 14, so that by moving the valve 12 to the second switching position and the detection result of the pressure detecting means 14, it can be determined whether or not there is desorption in the carbon canister 3, and further whether or not there is abnormality in the carbon canister 3.
In one specific application, when the vehicle is in the desorption diagnosis mode, the desorption diagnosis method includes: steps S21-S22.
Step S21: when in the desorption diagnosis, the engine 4 is started and is in the idle condition, and both the first communication valve 31 and the second communication valve 41 are in the open state. Under the idle working condition, the engine 4 works relatively stably, and the change of the pressure value of the pressure detection part 14 can more accurately reflect whether desorption exists in the carbon tank 3.
Step S22: when the controller 5 controls the moving valve 12 to move to the second change position, a second closed circuit is formed, and the engine 4 is started for desorbing the canister 3.
When the hybrid vehicle is in the pure electric mode, the controller 5 controls the moving valve 12 to move to the first change position or the second change position, and the switching device 1 cuts off the communication between the oil tank 2 and the carbon tank 3, so that the switching device 1 has the function of an oil tank isolation valve, and the first communication valve 31 and the second communication valve 41 are closed, thereby preventing oil gas leakage and reducing pollution.
When the engine 4 is closed and in the refueling mode, the controller 5 controls the first communication valve 31 to be opened, a user opens the refueling key, the controller 5 controls the movable valve 12 to move to a third exchange position to form a third closed circuit, the switching device 1 enables the fuel tank 2 to be communicated with the carbon tank 3, the fuel tank 2 can be deflated or the fuel tank 2 can be supplemented with air, the pressure in the fuel tank 2 is balanced, when the pressure value in the fuel tank 2 is smaller than a set pressure value, the user can open the fuel tank cover and refuel, after the refueling is finished, the fuel tank cover is closed, the controller 5 controls the movable valve 12 to move to the first exchange position or the second exchange position, and the communication between the fuel tank 2 and the carbon tank 3 is cut off.
While embodiments of the present invention have been shown and described, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that changes, modifications, substitutions and alterations may be made therein by those of ordinary skill in the art without departing from the spirit and scope of the invention, all such changes being within the scope of the appended claims.
Claims (11)
1. A diagnostic system comprising a switching device, the switching device comprising:
the sliding device comprises a main body, a sliding space and a valve body, wherein a movable moving valve is arranged in the sliding space, and the moving valve is provided with a first displacement position, a second displacement position and a third displacement position;
a first branch, a second branch and a detection branch for fluid circulation are arranged on or in the main body, a pressure detection component is arranged on the detection branch, and the movable valve is switched to different reversing positions after moving relative to the detection branch, the first branch and the second branch so that the detection branch, the first branch and the second branch are in different communication modes;
when the movable valve is in the first change position, a first closed circuit is formed between the movable valve and the detection branch and between the movable valve and the first branch, and the second branch is cut off, and the pressure detection component is used for detecting the pressure value of the first closed circuit;
when the movable valve is in the second change position, a second closed circuit is formed between the movable valve and the detection branch and between the movable valve and the second branch, and the first branch is cut off, and the pressure detection component is used for detecting the pressure value of the second closed circuit;
when the movable valve is in the third change position, a third closed circuit is formed among the movable valve, the detection branch, the first branch and the second branch, and the pressure detection component is used for detecting the pressure value of the third closed circuit;
the diagnostic system further comprises:
the oil tank is connected with the first branch;
the carbon tank is connected with the second branch and is also communicated with the outside through a first pipeline, and a first communication valve is arranged on the first pipeline;
the engine is communicated with the carbon tank through a second pipeline, and a second communication valve is arranged on the second pipeline;
and a controller for controlling the movement of the moving valve, the first and second communication valves, and acquiring a pressure value of the pressure detecting part.
2. The diagnostic system of claim 1, wherein the detection branch comprises a first detection branch for communicating with the first branch and a second detection branch for communicating with the second branch;
the moving valve is provided with a multi-section sealing part and a multi-section ventilation part, wherein the sealing part is used for isolating the first detection branch from the first branch or isolating the second detection branch from the second branch, and the ventilation part is used for communicating the first detection branch with the first branch or communicating the second detection branch with the second branch.
3. The diagnostic system of claim 2, wherein the multi-segment vent includes a first vent, a second vent, and a third vent disposed on the traveling valve at intervals, wherein one of the sealing portions is disposed between the first vent and the second vent, and wherein one of the sealing portions is disposed between the second vent and the third vent.
4. The diagnostic system of claim 3, wherein the first vent portion, the second vent portion, and the sealing portion are the same length along the length of the traveling valve, and the third vent portion is longer along the length of the traveling valve than the first vent portion.
5. The diagnostic system of claim 1, wherein the switching device further comprises: the sliding space is provided with a sliding space, a sliding valve control part and an elastic part, wherein the sliding valve control part is used for controlling the sliding valve to move in the sliding space to switch to different reversing positions, the elastic part is used for applying a reset acting force to the sliding valve, and the reset acting force is opposite to the acting force applied to the sliding valve by the sliding valve control part.
6. The diagnostic system of claim 1, wherein a pressure relief pipeline is communicated between the first branch and the second branch, and a pressure limiting valve is arranged on the pressure relief pipeline in a communicated manner and is used for releasing the pressure in the oil tank to one side of the carbon tank when the pressure in the oil tank is higher than a preset pressure.
7. A diagnostic method characterized in that the diagnostic system according to any one of claims 1 to 6 is used.
8. The diagnostic method of claim 7, wherein the diagnostic method comprises, when in a leak diagnostic mode:
the engine is started, the controller controls the first communication valve to be closed and the second communication valve to be opened, the controller controls the moving valve to move to the third direction changing position to form the third closed circuit, and the oil tank is communicated with the carbon tank;
the engine is used for exhausting, and when the pressure in the third closed circuit reaches a preset pressure value, the controller controls the second communication valve to be closed;
in a preset time period, judging whether leakage exists between the oil tank and the carbon tank and between the carbon tank and the second communication valve through pressure change of the pressure detection component, or the controller firstly controls the moving valve to move to the first switching position, then in the preset time period, judging whether leakage exists between the oil tank and the switching device through pressure change of the pressure detection component, or the controller firstly controls the moving valve to move to the second switching position, and then in the preset time period, judging whether leakage exists between the carbon tank and the switching device through pressure change of the pressure detection component.
9. The diagnostic method of claim 7, wherein the diagnostic method comprises, when in a desorption diagnostic mode: the engine is started, the controller controls the first communication valve and the second communication valve to be opened, the controller controls the moving valve to move to the second change position to form the second closed circuit, and whether desorption exists in the carbon tank is judged according to whether fluctuation exists in pressure of the pressure detection part in a preset time period.
10. The diagnostic method according to claim 7, wherein the diagnostic system is applied to a hybrid vehicle, and the controller controls the traveling valve to move to the first shift position or the second shift position when in the pure electric mode, and the first communication valve and the second communication valve are both closed.
11. The diagnostic method of claim 7 wherein when the engine is off and in a fueling mode, the controller controls the first communication valve to open, the controller controls the traveling valve to move to the third shift position, forming the third closed circuit and fueling; and after the fuel tank cover is closed after the fuel is filled, the controller controls the movable valve to move to the first shifting position or the second shifting position.
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| CN114233532A (en) * | 2021-12-30 | 2022-03-25 | 亚普汽车部件股份有限公司 | Flexible electric control valve, electric control fuel system and control method of electric control valve |
| CN217327884U (en) * | 2021-12-27 | 2022-08-30 | 武汉圣禹排水系统有限公司 | A valve |
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| DE19942011A1 (en) * | 1999-09-03 | 2001-03-08 | Fev Motorentech Gmbh | Piston engine with negative pressure generation with throttle-free air intake |
| CN112969859A (en) * | 2018-11-09 | 2021-06-15 | Smc 株式会社 | Flow rate controller and driving device provided with same |
| CN112269369A (en) * | 2020-10-21 | 2021-01-26 | 亚普汽车部件股份有限公司 | Linear control electric control valve and electric control fuel system |
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| CN116026533A (en) | 2023-04-28 |
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