Evaporative emission leakage diagnosis actuator

Abstract

The utility model relates to an evaporative emission leakage diagnosis actuator, which is characterized in that a wiring terminal assembly inserted on a winding framework of a reversing valve assembly is arranged, and the wiring terminal assembly is electrically connected with the reversing valve assembly, a heater assembly and an air pump assembly respectively, so that the integrated design of wiring terminals of all the assemblies is realized; the winding framework and the wiring terminal are combined into a whole, a winding wire of the electromagnetic reversing valve is directly connected with the wiring terminal assembly in a resistance welding mode, the precision requirement of a puncturing technology in a traditional design scheme is lowered, production cost is reduced, meanwhile, the electromagnetic reversing valve is more reliable and stable, and meanwhile the wiring structure is simple. And the automatic winding process can be realized.

Description

Technical Field

[0001] The utility model relates to an evaporative emission leakage diagnosis actuator, belonging to automobile technology. Background Art

[0002] Due to the requirements of the National VI emission standards, vehicles that use gasoline as fuel, including pure gasoline fuel vehicles, plug-in hybrid vehicles and extended-range hybrid vehicles, have added a functional component that identifies leaks in the fuel tank, fuel vapor pipeline to the charcoal canister solenoid valve system on the basis of the fuel vapor recovery system EVAP component of traditional vehicles: the fuel evaporative emission leak diagnostic module (DMTL) system, which uses the ECU to control the evaporative emission diagnostic actuator, inflates the fuel tank and pipelines to judge the current of the internal charging pump drive motor of the diagnostic actuator and compares it with the charging current of the standard leak hole in the actuator. The current of the charging pump drive motor is used to judge whether there is a leak in the entire system including the fuel tank, pipeline, etc. inside the ECU. The system can identify leaks with a maximum diameter of 0.5mm and can alert system faults by lighting the engine fault light.

[0003] However, the wiring methods of various components of the existing fuel evaporative emission leak diagnostic module (DMTL) system are usually set up separately, the wiring layout is complicated, and the connection method of the winding of the reversing valve is achieved by piercing the enameled wire film through the terminal after the winding is completed. The piercing process requires high precision, but this wiring method will cause poor contact during use, resulting in unstable connection, which affects the use of the fuel evaporative emission leak diagnostic module (DMTL) system. Utility Model Content

[0004] The utility model aims to provide an evaporative emission leakage diagnostic actuator, which is electrically connected to a reversing valve assembly, a heater assembly and an air pump assembly respectively by setting wiring terminals, so as to realize an integrated design of wiring terminals, and the connection is stable and the conductivity is more reliable.

[0005] In order to achieve the above-mentioned object, the utility model provides the following technical solution: an evaporative emission leak diagnostic actuator, the evaporative emission leak diagnostic actuator comprising:

[0006] A housing, in which a first chamber and a second chamber are provided with a main hole and a reference hole, a transition hole is provided between the first chamber and the second chamber, and the first chamber is communicated with a fuel tank carbon canister;

[0007] A reversing valve assembly, comprising a sealing member arranged in the first chamber and an electromagnetic reversing valve arranged outside the second chamber and connected to the sealing member, wherein the sealing member closes the main hole or the transition hole under the drive of the electromagnetic reversing valve;

[0008] An air pump assembly is arranged in the housing, an air inlet of the air pump assembly is connected to the atmospheric through hole of the housing, and a high-pressure air outlet of the air pump assembly is connected to the main hole and the reference hole;

[0009] A heater assembly, disposed in the housing to maintain an ambient temperature;

[0010] The wiring terminal assembly is plugged into the winding frame of the reversing valve assembly and is electrically connected to the reversing valve assembly, the heater assembly and the air pump assembly respectively.

[0011] Furthermore, the terminal assembly includes a plug-in end that is plugged into the winding skeleton and a connecting end that is electrically connected to the reversing valve assembly, the heater assembly and the air pump assembly.

[0012] Furthermore, the wiring terminal includes four wiring terminals, one of which is a common positive terminal, and the others are a negative terminal of the air pump, a negative terminal of the reversing valve, and a negative terminal of the heater.

[0013] Furthermore, the plug-in end includes four buckles located on the same plane, and the buckles located on both sides are provided with serrated clamping parts.

[0014] Furthermore, the sealing member comprises a frame and a sealing film arranged on the frame, wherein the sealing film is coated on the peripheral side of the frame and has beveled sealing lips formed in the direction toward the main hole and the transition hole.

[0015] Furthermore, the armature of the reversing valve is inserted into the frame and fixedly connected to the frame via an elastic cylindrical pin.

[0016] Furthermore, the connecting parts of the armature and the frame are both provided with offset parts for limiting the relative positions of the two.

[0017] Furthermore, the skeleton is a sealing disk and a stepped connecting tube extending outward from the center of the sealing disk, a square groove penetrating the sealing disk is provided at the connection between the stepped connecting tube and the sealing disk, and the sealing film is coated on the sealing disk and partially located in the square groove.

[0018] Furthermore, the shell includes a lower shell and an upper shell buckled with the lower shell, the first chamber and the second chamber are formed in the lower shell, and part of the reversing valve assembly is arranged in the upper shell.

[0019] Furthermore, support ribs for supporting the terminal assembly are arranged in the lower shell.

[0020] The beneficial effects of the present utility model are as follows: the present application realizes an integrated design of the wiring terminals of each component by providing a terminal block assembly plugged into the winding skeleton of the reversing valve assembly, and utilizing the terminal block assembly to electrically connect to the reversing valve assembly, the heater assembly and the air pump assembly respectively, so that the winding skeleton and the terminal block are combined into a whole, and the winding of the electromagnetic reversing valve is directly connected to the terminal block assembly by resistance welding, thereby reducing the precision requirements of the puncture process of the traditional design scheme, reducing the production cost, and being more reliable and stable. At the same time, the wiring structure is simple, which is conducive to realizing an automated winding process.

[0021] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the internal structure of an evaporative emission leak diagnostic actuator shown in an embodiment of the present application.

[0023] Figure 2 for Figure 1 Schematic diagram of the structure of the terminal block assembly.

[0024] Figure 3 for Figure 1 Schematic diagram of the explosion structure of the middle seal and armature.

[0025] Figure 4 for Figure 1 Schematic diagram of the structure of the middle seal.

[0026] Figure 5 for Figure 1 Schematic diagram of the structure of the middle and lower shells.

[0027] Figure 6 for Figure 1 An enlarged schematic diagram of the structure of the middle plug. DETAILED DESCRIPTION

[0028] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] In the description of the present invention, it is necessary to understand that the terms "center", "longitudinal", "lateral", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] In the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances. In addition, in the present utility model, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium.

[0032] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0033] Please refer to Figures 1 to 6 An evaporative emission leak diagnostic actuator is shown in an embodiment of the present application. The evaporative emission leak diagnostic actuator includes a housing 1 and a reversing valve assembly 21, an air pump assembly, a heater assembly and a terminal assembly arranged in the housing 1.

[0034] Please refer to Figure 1 and Figure 5The housing 1 is provided with a first chamber 121 and a second chamber 122 with a main hole 124 and a reference hole 123, a transition hole 125 is provided between the first chamber 121 and the second chamber 122, and the first chamber 121 is connected to the fuel tank carbon canister. The housing 1 includes a lower housing 12 and an upper housing 11 that is buckled with the lower housing 12, wherein the first chamber 121 and the second chamber 122 are both formed in the lower housing 12, and an installation cavity is formed in the upper housing 11 for accommodating part of the reversing valve assembly 21 and the air pump assembly.

[0035] The reversing valve assembly 21 includes a sealing member 24 disposed in the first chamber 121 and an electromagnetic reversing valve disposed outside the second chamber 122 and connected to the sealing member 24 . The sealing member 24 closes the main hole 124 or the transition hole 125 under the drive of the electromagnetic reversing valve.

[0036] The air pump assembly is arranged in the housing 1, the air inlet of the air pump assembly is connected to the atmospheric through hole 126 of the housing 1, and the high-pressure air outlet thereof is connected to the main hole 124 and the reference hole 123. The atmospheric through hole 126 is arranged on the lower housing 12, and the air pump assembly includes an air pump and a fixing spring for installing the air pump, wherein the air pump is located in the upper housing 11, and the fixing spring is connected between the air pump and the lower housing 12, and the upper housing 11 covers the air pump to compress the fixing spring, so that after the upper housing 11 and the lower housing 12 are covered, the fixing spring is in a compressed state to hold the air pump against and fixed in the upper housing 11.

[0037] The heater assembly is arranged in the housing 1 to maintain the ambient temperature. Before the evaporative emission leak diagnostic actuator performs diagnostic work, the heater assembly is started so that the ambient temperature of the evaporative emission leak diagnostic actuator is maintained at a set value that meets the diagnostic work requirements.

[0038] The wiring terminal assembly is plugged into the winding frame 23 of the reversing valve assembly 21 and is electrically connected to the reversing valve assembly 21, the heater assembly and the air pump assembly respectively.

[0039] The terminal assembly includes a plug-in end that is plugged into the winding skeleton 23 and a connection end that is electrically connected to the reversing valve assembly 21, the heater assembly and the air pump assembly. A plug-in slot is formed on the winding skeleton 23, and the plug-in end includes four buckles 51 located in the same plane, and the buckles 51 located on both sides are provided with serrated clamping parts 511. The four buckles 51 are arranged at intervals on the horizontal plane. After the plug-in end is plugged into the plug-in slot of the winding skeleton 23, the two buckles 51 with the serrated clamping parts 511 are clamped with the plug-in slot, which can effectively prevent the terminal assembly from falling out after insertion. The other two buckles 51 are tightly matched with the plug-in slot, which increases the positioning of the terminal assembly.

[0040] Please refer to Figure 2The connection terminal includes four connection terminals, one of which is a common positive terminal 52, and the others are an air pump negative terminal 55, a reversing valve negative terminal 53, and a heater negative terminal 54. Among them, the four connection terminals extend out of the housing 1 to be electrically connected to an external power supply component, and the common positive terminal 52 is internally connected to three internal pins, which are respectively a reversing valve positive pin 523, a heater positive pin 522, and an air pump positive pin 521. The reversing valve positive pin 523, the reversing valve positive pin 523, and the air pump positive pin 521 are electrically connected to the positive terminal of the electromagnetic reversing valve, the positive terminal of the heater, and the positive terminal of the air pump, respectively. The negative terminal 55 of the air pump is connected with a negative pin 551 of the air pump for connecting to the air pump, the negative terminal 53 of the reversing valve is connected with a negative pin 531 of the reversing valve for connecting to the electromagnetic reversing valve, the negative terminal 54 of the heater is connected with a negative pin 541 of the heater for connecting to the heater, and the negative pin 531 of the reversing valve, the negative pin 541 of the heater and the negative pin 551 of the air pump are electrically connected to the negative terminal of the electromagnetic reversing valve, the negative terminal of the heater and the negative terminal of the air pump respectively. By integrating the wiring terminals of the electromagnetic reversing valve, the heater and the air pump, the assembly of the evaporative emission leak diagnosis actuator is facilitated, the precision requirements of the puncture process of the traditional design are reduced, the production cost is reduced, and the wiring terminal connection is more reliable and the conductivity is better.

[0041] In addition, when the current in the winding coil 22 of the electromagnetic reversing valve is suddenly interrupted, a reverse induced electromotive force will be generated inside the coil 22, resulting in a reverse voltage, which may damage the coil 22. Therefore, a diode, a diode cathode pin 57 and a diode anode pin 56 are also provided at the wiring terminal, the anode of the diode is connected to the diode anode pin 56, the cathode of the diode is connected to the diode cathode pin 57, the diode anode pin 56 is connected to the reversing valve anode pin 523, and the diode cathode pin 57 is connected to the reversing valve cathode pin 531. By reversely connecting the diode in parallel to the coil 22, the reverse voltage can be released through the conduction of the diode, thereby protecting the coil 22 from damage.

[0042] Please refer to Figure 3 and Figure 4 The sealing member 24 includes a frame and a sealing film 243 disposed on the frame. The sealing film 243 is coated on the peripheral side of the frame and has chamfered sealing lips 2432 and 2431 formed in the direction toward the main hole 124 and the transition hole 125. The sealing film 243 is a rubber sealing member 24 formed by a vulcanization process. The rubber sealing member 24 has chamfered sealing lips 2432 and 2431 formed in the direction toward the main hole 124 and the transition hole 125. The chamfered film design can make the sealing lips produce a better sealing effect when in contact with the sealed compartment.

[0043] The armature 21 of the reversing valve is inserted into the frame and fixedly connected to the frame through the elastic cylindrical pin 25. The armature 21 and the elastic cylindrical pin 25 are interference fit to prevent the elastic cylindrical pin 25 from coming out; the frame and the elastic cylindrical pin 25 are clearance fit to ensure that the frame and the armature 21 are in floating connection.

[0044] The armature 21 and the frame are both provided with a deflection portion 211 for limiting the relative position of the two. The fixing hole 212 for installing the elastic cylindrical pin 25 is arranged at the deflection portion 211 in a direction perpendicular to the deflection portion 211, so that after the armature 21 and the frame are plugged, the armature 21 and the frame's fixing hole 212 are just butted, reducing the difficulty of installing the elastic cylindrical pin 25. In addition, two pairs of edges 2421 are provided on the frame to increase the positioning surface when the frame is placed in the tooling.

[0045] The framework is a sealing disk 241 and a stepped connecting tube 242 extending outward from the center of the sealing disk 241. A square groove 2411 penetrating the sealing disk 241 is provided at the connection between the stepped connecting tube 242 and the sealing disk 241. The sealing film 243 is coated on the sealing disk 241 and partly located in the square groove 2411. When the sealing film 243 is injection molded on the sealing disk 241, the square groove 2411 is filled with the sealing film 243, so that a connecting rib 2431 penetrating the sealing disk 241 is formed in the sealing film 243, thereby increasing the bonding reliability of the sealing film 243.

[0046] Please refer to Figure 5 A supporting rib 127 for supporting the terminal assembly is provided in the lower housing 12. This avoids the problem of terminal displacement and poor contact when the connector is assembled during the vehicle assembly process.

[0047] Please refer to Figure 6 An air flow channel is formed between the air pump assembly and the main hole 124 and the reference hole 123. A through hole will be reserved in the air flow channel during processing and forming. It needs to be sealed by a plug before assembling the evaporative emission leakage diagnosis actuator. The plug is provided with an O-ring 61. In addition, an overflow groove 62 is also provided on the plug. A rib 128 is provided on the outer end face of the through hole. The rib 128 is used as a melted welding rod when ultrasonically welding the plug and the end face of the through hole, and the overflow groove 62 is used to collect the melted welding rod to achieve welding of the plug and the end face of the through hole to ensure structural strength and sealing effect.

[0048] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. An evaporative emission leak diagnostic actuator, characterized in that: The evaporative emission leak diagnostic actuator comprises: A housing, in which a first chamber and a second chamber are provided with a main hole and a reference hole, a transition hole is provided between the first chamber and the second chamber, and the first chamber is communicated with a fuel tank carbon canister; A reversing valve assembly, comprising a sealing member arranged in the first chamber and an electromagnetic reversing valve arranged outside the second chamber and connected to the sealing member, wherein the sealing member closes the main hole or the transition hole under the drive of the electromagnetic reversing valve; An air pump assembly is arranged in the housing, an air inlet of the air pump assembly is connected to the atmospheric through hole of the housing, and a high-pressure air outlet of the air pump assembly is connected to the main hole and the reference hole; A heater assembly, disposed in the housing to maintain an ambient temperature; The wiring terminal assembly is plugged into the winding frame of the reversing valve assembly and is electrically connected to the reversing valve assembly, the heater assembly and the air pump assembly respectively.

2. The evaporative emission leak diagnostic actuator according to claim 1, characterized in that: The terminal assembly includes a plug-in end that is plugged into the winding skeleton and a connecting end that is electrically connected to the reversing valve assembly, the heater assembly and the air pump assembly.

3. The evaporative emission leak diagnostic actuator according to claim 2, characterized in that: The wiring terminal comprises four wiring terminals, one of which is a common positive terminal, and the others are respectively an air pump negative terminal, a reversing valve negative terminal and a heater negative terminal.

4. The evaporative emission leak diagnostic actuator according to claim 2, characterized in that: The plug-in end comprises four buckles located on the same plane, and the buckles located on both sides are provided with serrated clamping parts.

5. The evaporative emission leak diagnostic actuator according to claim 1, characterized in that: The sealing member comprises a frame and a sealing film arranged on the frame. The sealing film is coated on the peripheral side of the frame and has beveled sealing lips formed in the direction toward the main hole and the transition hole.

6. The evaporative emission leak diagnostic actuator according to claim 5, characterized in that: The armature of the electromagnetic reversing valve is inserted into the frame and fixedly connected to the frame via an elastic cylindrical pin.

7. The evaporative emission leak diagnostic actuator according to claim 6, characterized in that: The insertion parts of the armature and the frame are both provided with offset parts for limiting the relative positions of the two.

8. The evaporative emission leak diagnostic actuator according to claim 7, characterized in that: The skeleton is a sealing disk and a stepped connecting tube extending outward from the center of the sealing disk. A square groove penetrating the sealing disk is provided at the connection between the stepped connecting tube and the sealing disk. The sealing film is coated on the sealing disk and is partially located in the square groove.

9. The evaporative emission leak diagnostic actuator according to claim 1, characterized in that: The housing comprises a lower housing and an upper housing snapped with the lower housing, the first chamber and the second chamber are formed in the lower housing, and part of the reversing valve assembly is arranged in the upper housing.

10. The evaporative emission leak diagnostic actuator according to claim 9, characterized in that: Support ribs for supporting the terminal assembly are arranged in the lower shell.

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