Fuel leakage diagnosis pump

Abstract

The utility model discloses a fuel oil leakage diagnosis pump which comprises a shell, a socket, an air inlet pipe and an air outlet pipe are arranged on the shell, an air pump and a spring electromagnetic valve are arranged in the shell, the socket is electrically connected with the air pump and the spring electromagnetic valve, and an outlet of the air pump is communicated with an inlet of the air outlet pipe through a channel. The spring electromagnetic valve is arranged at an inlet of the air outlet pipe and comprises an inner shell, a coil, a movable iron core, a spring and a sealing disc, the sealing disc is connected to one end of the movable iron core, the coil is arranged in an inner cavity of the inner shell, the movable iron core moves along a center hole of the coil, and a limiting support is erected on the end face of the inner shell and used for limiting movement of the sealing disc. By means of the structure, air inlet and outlet control is accurate, the design is reasonable and reliable, the spring electromagnetic valve and the air pump can be independently produced and then assembled, and the assembling efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to a detection component on an automobile, in particular to a fuel leakage diagnostic pump. Background Art

[0002] The development of automobiles has an increasingly significant impact on the environment. The treatment of automotive exhaust gas, as well as fuel leakage or evaporation, has not been addressed in automobiles before the National V standard. As a result, vehicle users are unable to detect fuel leakage. Since fuel is volatile and flammable, once the leaked fuel reaches a certain concentration and encounters a spark, it can cause deflagration, endangering the surrounding environment and personnel. Additionally, leaked fuel also imposes an extra economic burden on vehicle users. At the same time, the fuel evaporation control system (EVAP) of the National VI standard for automobiles has increased the requirements for fuel leakage diagnosis compared to that of the National V standard.

[0003] Therefore, there is an urgent need for diagnostic components on vehicles that can detect fuel leakage or evaporation to meet the National VI standard for automobiles and also for the benefit of vehicle users. Summary of the Utility Model

[0004] To solve the above problems, the purpose of the utility model is to provide a fuel leakage diagnostic pump with a reasonable and reliable structural design.

[0005] To achieve the above purpose, the utility model provides the following technical solutions: It includes a housing, on which a socket, a pressure sensor, an intake pipe, and an exhaust pipe are provided. The pressure sensor and the socket are respectively connected to the vehicle ECU. The pressure sensor is installed inside the vehicle fuel tank. Inside the housing, an air pump and a spring solenoid valve are provided. The socket is electrically connected to the air pump and the spring solenoid valve. The outlet of the air pump is connected to the inlet of the exhaust pipe through a channel. The spring solenoid valve is arranged at the inlet of the exhaust pipe. The spring solenoid valve includes an inner housing, a coil, a movable iron core, a spring, and a sealing disc. The sealing disc is connected to one end of the movable iron core. The coil is arranged inside the inner cavity of the inner housing. The movable iron core moves along the central hole of the coil. On the end face of the inner housing, a limiting bracket is provided. The limiting bracket is provided with circumferentially evenly distributed limiting arms. The upper end of the limiting arm is provided with an inwardly convex limiting bump. The spring is arranged between the inner housing and the sealing disc. The sealing disc abuts against the limiting bump under the action of the spring.

[0006] In the inner housing, a core limiting block is further provided. The end of the core limiting block is provided with a conical convex block. At the tail end of the movable iron core, a conical groove matching the conical convex block is provided. When the coil is energized, a magnetic field is generated. The movable iron core moves under the action of the magnetic field and makes the conical convex block and the conical groove contact.

[0007] The described air pump includes a turbine housing, an impeller, and a motor. The motor is installed on the turbine housing, and the motor shaft of the motor is inserted into the turbine housing and connected to the impeller. A ventilation sleeve is also provided on the turbine housing.

[0008] A heating sheet is further installed in the housing, and the heating sheet is installed on the air pump.

[0009] The beneficial effects of the present utility model are as follows: During fuel leakage diagnosis, the automotive ECU controls the socket to be powered on to separately control the spring solenoid valve and the air pump. The spring solenoid valve opens the air outlet pipe, and the air pump operates to pump air into the fuel tank through the air outlet pipe. The pressure sensor in the fuel tank is used to monitor the pressure change in the system, so that the automotive ECU can determine whether there is a leakage and the degree of leakage. This structure enables precise control of air inlet and outlet and has a reasonable and reliable design. The spring solenoid valve and the air pump can be independently produced and then assembled, greatly improving the assembly efficiency.

[0010] The following further describes the present utility model in conjunction with the accompanying drawings and specific embodiments. Description of the Drawings

[0011] Figure 1 It is a structural diagram of a specific embodiment of the present utility model;

[0012] Figure 2 It is a three-dimensional view of the spring solenoid valve in a specific embodiment of the present utility model;

[0013] Figure 3 It is a cross-sectional view of the spring solenoid valve in a specific embodiment of the present utility model. Specific Embodiments

[0014] The following specifically describes the present utility model through examples, which are only used for further illustration of the present utility model and should not be construed as limiting the protection scope of the present utility model.

[0015] Such as Figure 1 — Figure 3As shown in the figure, this embodiment discloses a fuel leakage diagnostic pump, which includes a housing 1. A socket 2, a pressure sensor, an intake pipe, and an outlet pipe 3 are arranged on the housing 1. The sensor and the socket 2 are respectively connected to the vehicle ECU. The pressure sensor is installed in the vehicle fuel tank. Generally, the intake pipe is connected to a filter, and the outlet pipe 3 leads to the fuel tank through a carbon canister. An air pump 4 and a spring solenoid valve 5 are arranged in the housing 1. The socket 2 is electrically connected to the air pump 4 and the spring solenoid valve 5. The outlet of the air pump 4 is communicated with the inlet of the outlet pipe 3 through a channel 10. The spring solenoid valve 5 is arranged at the inlet of the outlet pipe 3. The spring solenoid valve 5 can be an independent and detachable component. The spring solenoid valve 5 includes an inner shell 51, a coil 52, a movable iron core 53, a spring 54, and a sealing disc 55. The sealing disc 55 is connected to one end of the movable iron core 53. The coil 52 is arranged in the inner cavity of the inner shell 51. The movable iron core 53 moves along the central hole of the coil 52. A limiting bracket 512 is mounted on the end face of the inner shell 51. The limiting bracket 512 is provided with circumferentially evenly distributed limiting arms 513. The upper end of the limiting arm 513 is provided with an inwardly convex limiting protrusion. The spring 54 is arranged between the inner shell 51 and the sealing disc 55. The sealing disc 55 abuts against the limiting protrusion under the action of the spring 54, thereby restricting the movement of the sealing disc 55.

[0016] An iron core limiting block 56 is further arranged in the inner shell 51. The end of the iron core limiting block 56 is provided with a conical protrusion. A conical groove matching the conical protrusion is arranged at the tail end of the movable iron core 53. After the coil 52 is energized to generate a magnetic field, the movable iron core 53 moves under the action of the magnetic field and makes the conical protrusion and the conical groove contact. The iron core limiting block 56 can effectively control the stroke of the movable iron core 53 and prevent it from overmoving, which affects the opening or closing efficiency of the outlet pipe 3.

[0017] The air pump 4 is an independent component. The air pump 4 includes a turbine housing 41, an impeller 42, and a motor 43. The motor 43 is installed on the turbine housing 41. The motor shaft of the motor 43 is inserted into the turbine housing 41 and connected to the impeller 42. A ventilation sleeve 44 is further arranged on the turbine housing 41. The ventilation sleeve 44 can be inserted into one end of the channel in the housing 1 leading to the outlet pipe 3. The motor 43 can drive the impeller 42 to generate air pressure output and lead it to the fuel tank, so that a positive pressure is generated in the ventilation system of the fuel tank.

[0018] A heating sheet 6 is also installed in the housing 1. The heating sheet 6 is installed on the air pump 4. During the detection and use process, water vapor may condense on the air pump 4. These water vapors will cause changes in mechanical friction, resulting in fluctuations in the pump current. If the pump current fluctuates too much, it will have a greater impact on the reliability of the leakage diagnosis. The heating sheet 6 can melt the condensed water vapor, making the inside of the fuel leakage diagnostic pump drier, improving the service life of the fuel leakage diagnostic pump and improving the diagnostic accuracy.

[0019] The working principle of the fuel leakage diagnostic pump is as follows: After the automotive ECU controls the socket 2 to be powered on, the spring solenoid valve 5 opens the channel of the air outlet pipe 3, and the air pump 4 pumps air into the fuel tank, making the ventilation system of the fuel tank in a positive pressure state. The pressure sensor in the fuel tank transmits the value to the automotive ECU for processing and diagnosis. That is, the fuel leakage diagnostic pump will determine whether to use the open diagnostic mode according to the measured pressure value of the fuel tank pressure sensor. In the open diagnostic mode, the air pump will perform internal circulation inflation to obtain a measured stable current. By comparing this current value with the characteristics of the pump current, the tightness of the entire fuel system can be detected, mainly used to determine whether there is a leakage in the fuel evaporation control system (EVAP).

[0020] With the above technical solution, during fuel leakage diagnosis, the automotive ECU controls the socket 2 to be powered on to respectively control the spring solenoid valve 5 and the air pump 4. The spring solenoid valve 5 opens the air outlet pipe 3, and the air pump 4 operates to pump out air and enter the fuel tank through the air outlet pipe 3. The pressure sensor in the fuel tank is used to monitor the pressure change in the system, so that the automotive ECU can determine whether there is a leakage and the degree of leakage. This structure enables precise control of air inlet and outlet and is reasonably designed and reliable. The spring solenoid valve 5 and the air pump 4 can be independently produced and then assembled, greatly improving the assembly efficiency.

[0021] After this fuel leakage diagnostic pump is installed on the vehicle, the vehicle production can meet the national vehicle emission standard of China VI, and it also guarantees the interests and safety of vehicle users.

[0022] The above shows and describes the basic principle, main features and advantages of the present utility model. For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the present utility model. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0023] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A fuel leakage diagnostic pump, comprising a housing, on which a socket, a pressure sensor, an intake pipe and an exhaust pipe are provided, the pressure sensor and the socket are respectively connected to an automotive ECU, the pressure sensor is installed in an automotive fuel tank, and is characterized in that: An air pump and a spring solenoid valve are arranged inside the shell. The socket is electrically connected to the air pump and the spring solenoid valve. The outlet of the air pump is communicated with the inlet of the air outlet pipe through a channel. The spring solenoid valve is arranged at the inlet of the air outlet pipe. The spring solenoid valve comprises an inner shell, a coil, a movable iron core, a spring and a sealing disc. The sealing disc is connected to one end of the movable iron core. The coil is arranged in the inner cavity of the inner shell. The movable iron core moves along the central hole of the coil. A limiting bracket is mounted on the end face of the inner shell. The limiting bracket is provided with circumferentially evenly distributed limiting arms. The upper ends of the limiting arms are provided with inwardly convex limiting bumps. The spring is arranged between the inner shell and the sealing disc. The sealing disc abuts against the limiting bumps under the action of the spring.

2. The fuel leakage diagnostic pump according to claim 1, characterized in that: A iron core limiting block is further arranged in the inner shell. The end of the iron core limiting block is provided with a conical bump. A conical groove matching with the conical bump is arranged at the tail end of the movable iron core. After the coil is electrified to generate a magnetic field, the movable iron core moves under the action of the magnetic field and makes the conical bump and the conical groove contact.

3. The fuel leakage diagnostic pump according to claim 1, characterized in that: The air pump comprises a turbine housing, an impeller and a motor. The motor is mounted on the turbine housing. The motor shaft of the motor is inserted into the turbine housing and connected to the impeller. An air vent sleeve is further arranged on the turbine housing.

4. The fuel leakage diagnostic pump according to claim 1, wherein: A heating sheet is further mounted inside the shell. The heating sheet is mounted on the air pump.

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