DMTL module fault simulation device
By designing the DMTL module fault simulation device, using a one-way throttle valve and nylon tube to adjust the pump current, the efficiency and cost problems of fault verification in PVE test are solved, and flexible fault verification and cost reduction are achieved.
Patent Information
- Application Number
- CN202420460724.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-11
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-03-11
AI Technical Summary
In PVE test, the fault verification of the DMTL module has a large number of fault codes, a long test cycle, and a high difficulty in verification. The existing technology cannot flexibly control the current of the DMTL pump, resulting in an increase in economic and time costs.
A DMTL module fault simulation device is designed, using a one-way throttle valve and nylon pipe to flexibly control the current of the DMTL pump by adjusting the valve opening of the throttle valve to achieve fault simulation.
It improves the efficiency of fault verification, reduces costs, and can flexibly cover the fault verification of EVAP working cycle, reducing dependence on original vehicle components.
Smart Images
Figure CN222189745U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of vehicle fault detection, in particular to a DMTL module fault simulation device. Background Art
[0002] As my country's environmental protection requirements become increasingly stringent, new National VI regulations have been introduced in the field of motor vehicles. Among them, the production vehicle evaluation test (PVE) is a new OBD (On-Board Diagnostics) consistency check added to the National VI regulations, requiring the vehicle OBD system to effectively monitor and report the vehicle's emission status. In order to meet the National VI emission regulations, many vehicle manufacturers choose to install a fuel emission leak diagnostic module (DMTL) on the basis of the original EVAP (Evaporative Emission Control System), which can promptly detect whether the fuel tank and its fuel pipeline system are leaking, and avoid environmental pollution caused by fuel vapor leakage. Therefore, in the PVE test, when verifying the relevant faults of the EVAP system, it is necessary to control the relevant components of the DMTL module or replace the faulty parts.
[0003] The DMTL module actively pumps air into the fuel tank system to pressurize it, and performs leakage diagnosis based on the feedback of the pump current. To adapt to different engine working conditions, different working modes can be switched, such as reference measurement mode, leakage monitoring mode, activated carbon regeneration mode, etc. In the PVE test, the verification of related faults in various working modes of the DMTL module has the characteristics of a large number of fault codes, a long test cycle, and great verification difficulty. At present, the verification of such related faults is mainly carried out by disassembling the DMTL pipeline or replacing the corresponding faulty parts, and the DMTL pump current cannot be flexibly controlled to meet the calibrated threshold, resulting in an increase in the economic and time costs of verification. Utility Model Content
[0004] In view of the above problems in the prior art, the utility model proposes a DMTL module fault simulation device, which can flexibly control the DMTL pump current to cover the fault verification work of the EVAP working cycle, improve the verification efficiency and reduce the cost.
[0005] Specifically, the utility model proposes a DMTL module fault simulation device, which is suitable for National VI PVE testing, including:
[0006] Fuel pipe quick connector;
[0007] One-way throttle valve;
[0008] A first nylon tube and a second nylon tube, wherein one end of the first nylon tube is connected to the fuel pipe quick connector, and the other end is connected to the outlet of the one-way throttle valve; one end of the second nylon tube is connected to the inlet of the one-way throttle valve;
[0009] The fuel pipe quick connector is used to connect the air inlet of the vehicle DMTL module, and the fault simulation of the DMTL module is achieved by adjusting the valve opening of the one-way throttle valve.
[0010] According to an embodiment of the utility model, the one-way throttle valve is of model ASC100-10, and is provided with a flow regulating cap for controlling the valve opening of the one-way throttle valve.
[0011] According to an embodiment of the present invention, the inner diameter of the first nylon tube is 8 mm and the wall thickness is 1 mm.
[0012] According to an embodiment of the utility model, the fuel pipe quick connector is an ID6 elbow connector, one end of which has an outer diameter of 7.89 mm and is fixedly matched with one end of the first nylon tube;
[0013] The other end of the fuel pipe quick connector is matched and fixed with the male connector of the air inlet of the vehicle DMTL module.
[0014] The fault simulation device also includes an elastic clamp for fixedly connecting one end of the first nylon tube to the fuel pipe quick connector.
[0015] The model of the elastic clamp is M9.
[0016] The elastic clamp has a thickness of 0.5 mm and a width of 5 mm.
[0017] An air filter element is arranged in the second nylon tube.
[0018] The utility model provides a DMTL module fault simulation device, which utilizes a one-way throttle valve to flexibly control the magnitude of the DMTL pump current to cover the fault verification work of the EVAP working cycle, thereby improving the verification efficiency and reducing the cost.
[0019] It should be understood that the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the present invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The accompanying drawings are included to provide further explanation of the utility model, and they are included and constitute a part of this application. The accompanying drawings illustrate embodiments of the utility model and together with this specification serve to explain the principles of the utility model. In the accompanying drawings:
[0021] Figure 1 A schematic structural diagram of a DMTL module fault simulation device according to an embodiment of the utility model is shown.
[0022] The above drawings include the following reference numerals:
[0023] Fault simulation device 100
[0024] Fuel Line Quick Connector 101
[0025] One-way throttle valve 102
[0026] First nylon tube 103
[0027] Second nylon tube 104 DETAILED DESCRIPTION
[0028] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.
[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually merely illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.
[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0031] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.
[0032] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.
[0033] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.
[0034] Figure 1 The structure diagram of the DMTL module fault simulation device of one embodiment of the utility model is shown. As shown in the figure, a DMTL module fault simulation device 100 suitable for the National VI PVE test mainly includes a fuel pipe quick connector 101, a one-way throttle valve 102, a first nylon tube 103 and a second nylon tube 104.
[0035] The fuel pipe quick connector 101 makes the connection with other interfaces faster and more convenient, and no longer needs to use traditional methods such as pipe connectors. It is not only durable, but also reliable, not prone to oil leakage, and highly safe. The use of the fuel pipe quick connector 101 can significantly improve the connection speed and efficiency, make quick connection possible, and reduce the complexity of traditional connection technology.
[0036] The one-way throttle valve 102 is a valve for controlling fluid flow by changing the throttle cross section or throttle length. Conventionally, a throttle valve and a one-way valve are connected in parallel to form the one-way throttle valve 102.
[0037] Among them, one end of the first nylon tube 103 is connected to the fuel pipe quick connector 101, and the other end is connected to the outlet of the one-way throttle valve 102. One end of the second nylon tube 104 is connected to the inlet of the one-way throttle valve 102. Nylon tubes are used because they have good physical, chemical and mechanical properties: wear resistance, can be used in conditions with sand, stone and iron filings; smooth surface, reduced resistance, can prevent rust and scaling accumulation; soft, easy to bend, easy to install, simple processing. At the same time, nylon tubes have rigidity. When a certain shape is required, they can be made into various shapes like metal tubes, and no complicated equipment and tooling are required; they can withstand corrosion from many chemical substances; they are dimensional stable and have low permeability; they have extremely high resistance and can be used as insulators; they have a long service life, even for decades; they have good temperature resistance and can work in an environment of -40-100℃.
[0038] The fuel pipe quick connector 101 is used to connect the air inlet of the vehicle DMTL module, and the fault simulation of the DMTL module is realized by adjusting the valve opening of the one-way throttle valve 102.
[0039] During actual testing, the connection pipeline between the detection pump of the vehicle DMTL module and the air filter element is removed, and the fuel pipe quick connector 101 of the DMTL module fault simulation device 100 provided by the utility model is connected to the air inlet of the DMTL module to completely install the fault simulation device 100 into the EVAP system pipeline. The ambient airflow can pass through the second nylon tube 104, the one-way throttle valve 102 and the first nylon tube 103, and the fuel pipe quick connector 101, and enter from the air inlet of the DMTL module. The vehicle ECU receives the DMTL module detection pump current signal to achieve fault verification of different thresholds.
[0040] Taking a certain type of gasoline vehicle as an example, when it is necessary to verify the fault code (P017F) of the DMTL module air filter resistance being too large, it is only necessary to reduce the air flow through the one-way throttle valve 102 until the vehicle ECU detects that the current fed back by the DMTL module detection pump is less than the calibrated threshold value, and then the fault verification can be completed. On the contrary, increasing the air flow through the one-way throttle valve 102 will cause the reference current fed back by the DMTL module detection pump to be too large, and the vehicle ECU will report the DMTL module detection pump current being too large fault (P043E). It is easy to understand that the fault codes related to the abnormal state of the detection pump current under different working conditions can be verified by this method. In other words, by adjusting the air flow through the one-way throttle valve 102, the DMTL module detection pump current can be flexibly controlled to cover the fault verification work of the EVAP working cycle, thereby improving the verification efficiency and reducing the cost.
[0041] In addition, when verifying the fault (P2407) of the DMTL module detecting pump current fluctuation beyond the reasonable range, the air flow through the one-way throttle valve 102 can be reciprocated according to the EVAP system monitoring strategy requirements, so that the detection pump current signal fluctuates between the maximum or minimum value. When the fluctuation amplitude exceeds the calibration threshold, the fault diagnosis can be completed.
[0042] Preferably, the model of the one-way throttle valve 102 is ASC100-10, and it is provided with a flow regulating cap for controlling the valve opening of the one-way throttle valve 102. As mentioned above, when it is necessary to verify the fault code (P017F) of the excessive air filter flow resistance of the DMTL module, it is only necessary to turn the flow regulating nut of the one-way throttle valve 102 to reduce the air flow through the one-way throttle valve 102 until the vehicle ECU detects that the current fed back by the DMTL module detection pump is less than the calibrated threshold value, and then the corresponding fault verification can be completed. Similarly, by turning the flow regulating nut of the one-way throttle valve 102 in the opposite direction and increasing the air flow through the one-way throttle valve 102, the reference current fed back by the DMTL module detection pump is too large, and the vehicle ECU can report the fault (P043E) of the excessive current of the DMTL module detection pump.
[0043] Preferably, the inner diameter of the first nylon tube 103 is 8 mm and the wall thickness is 1 mm.
[0044] Preferably, the fuel pipe quick connector 101 is an ID6 elbow connector, and the outer diameter of one end is 7.89 mm, which matches the size of the first nylon tube 103. The outer diameter of this end is matched and fixed with one end of the first nylon tube 103. The other end of the fuel pipe quick connector 101 is matched and fixed with the male connector of the vehicle DMTL module air inlet.
[0045] Preferably, the DMTL module fault simulation device 100 further includes an elastic clamp 105. The elastic clamp 105 is used to fix one end of the first nylon tube 103 and the fuel pipe quick connector 101 to form a stable connection between the two.
[0046] Preferably, the model of the elastic clamp 105 is M9.
[0047] Preferably, the elastic clamp 105 has a thickness of 0.5 mm and a width of 5 mm.
[0048] Preferably, an air filter is provided in the second nylon tube 104 to simulate the air filter of the vehicle. The external air is first filtered by the air filter and then introduced into the air inlet of the vehicle DMTL module through the one-way throttle valve 102 and the fuel pipe quick connector 101.
[0049] The DMTL module fault simulation device provided by the utility model has the following advantages:
[0050] The overall structure is compact and easy to carry;
[0051] Easy to disassemble and assemble, no need to replace original car parts, low cost;
[0052] High precision, can accurately control the pressure entering the pipeline system to adjust the current of the detection pump; Meeting the diagnostic thresholds of different faults to achieve relevant fault verification;
[0053] One installation can cover the verification work of all related faults, which is highly efficient.
[0054] It will be apparent to those skilled in the art that various modifications and variations can be made to the above exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention covers modifications and variations of the present invention that fall within the scope of the appended claims and their equivalent technical solutions.
Claims
1. A DMTL module fault simulation device suitable for National VI PVE testing, It is characterized in that include: Fuel pipe quick connector; One-way throttle valve; A first nylon tube and a second nylon tube, wherein one end of the first nylon tube is connected to the fuel pipe quick connector, and the other end is connected to the outlet of the one-way throttle valve; one end of the second nylon tube is connected to the inlet of the one-way throttle valve; The fuel pipe quick connector is used to connect the air inlet of the vehicle DMTL module, and the fault simulation of the DMTL module is achieved by adjusting the valve opening of the one-way throttle valve.
2. The DMTL module fault simulation device according to claim 1, It is characterized in that The model of the one-way throttle valve is ASC100-10, and it is provided with a flow regulating cap for controlling the valve opening of the one-way throttle valve.
3. The DMTL module fault simulation device according to claim 1, It is characterized in that The inner diameter of the first nylon tube is 8 mm and the wall thickness is 1 mm.
4. The DMTL module fault simulation device as claimed in claim 3, It is characterized in that The fuel pipe quick connector is an ID6 elbow connector, one end of which has an outer diameter of 7.89 mm and is fixedly matched with one end of the first nylon tube; The other end of the fuel pipe quick connector is matched and fixed with the male connector of the air inlet of the vehicle DMTL module.
5. The DMTL module fault simulation device as claimed in claim 1, It is characterized in that It also includes an elastic clamp for fixedly connecting one end of the first nylon tube and the fuel pipe quick connector.
6. The DMTL module fault simulation device as claimed in claim 5, It is characterized in that The model of the elastic clamp is M9.
7. The DMTL module fault simulation device as claimed in claim 6, It is characterized in that The elastic clamp has a thickness of 0.5 mm and a width of 5 mm.
8. The DMTL module fault simulation device according to claim 1, It is characterized in that An air filter element is arranged in the second nylon tube.