A reed valve assembly for a gasoline outboard motor

Abstract

The application discloses a kind of air supplement valve assembly of gasoline outboard motor, it is related to fuel evaporation control device technical field, including stepper motor, the upper end of stepper motor is equipped with motor connection ECU port, the lower end of stepper motor is equipped with valve core by output shaft, the lower end of the stepper motor is equipped with air supplement valve mounting seat, the lower end of the air supplement valve mounting seat is equipped with lower pipeline, gas outlet passage is opened in the inside of the lower pipeline, the gas outlet passage extends to outside intake manifold, the side end of the air supplement valve mounting seat is equipped with air supplement valve round pipe, air inlet is opened in the inside of the air supplement valve round pipe, the lower of valve core in the inside of the air supplement valve mounting seat is equipped with connecting port, the both ends of the connecting port are connected with air inlet and gas outlet passage respectively.The application is equipped with a series of structures, and the stepper motor driven air supplement valve is directly controlled by ECU, receives signal and acts synchronously with throttle, completely solves the problem of response lag of traditional spring type air supplement valve.

Description

Technical Field

[0001] This invention relates to the field of fuel evaporation control device technology, specifically to a fuel filler valve assembly for a gasoline outboard motor. Background Technology

[0002] As a commonly used four-stroke marine propulsion power unit, the gasoline outboard motor is equipped with a complete air intake system, which mainly includes components such as air filter, throttle valve, and intake manifold. Its working process is as follows: after the outside air is filtered by the air filter, the intake volume is regulated and controlled by the throttle valve, and then distributed to each air passage through the intake manifold. After being mixed with fuel, it enters the cylinder to complete combustion and do work.

[0003] In actual operation, existing gasoline outboard motors experience complex engine operating conditions. When sudden stops, idling, or sudden drops in speed occur, the throttle valve will close rapidly under the control of the ECU, causing a high negative pressure to form quickly in the intake manifold. This can easily lead to deformation or even damage to the intake manifold structure. At the same time, the sudden reduction in intake volume and the large amount of fuel evaporation under high vacuum will result in an excessively high air-fuel mixture concentration in the intake manifold. This reduces fuel economy and causes problems such as increased carbon deposits, excessive exhaust emissions, and easy contamination of spark plugs.

[0004] Currently, spring-loaded air replenishment valves are commonly used in equipment such as hydro-generator sets. They rely on the movement of the valve core and the spring force to achieve automatic opening and closing, thus achieving the effects of replenishing air and preventing negative pressure. However, when used directly in gasoline outboard motors, there are obvious defects: the valve core opening cannot be manually controlled, and the negative pressure during normal operation of the intake manifold can easily lead to poor sealing of the air replenishment valve and a short service life; moreover, the valve core action depends on changes in vacuum, and there is a lag in the response to changes in throttle position, which cannot meet the precise and rapid air replenishment control requirements of outboard motors. Summary of the Invention

[0005] The purpose of this invention is to provide a supplemental air valve assembly for a gasoline outboard motor to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a gas filler valve assembly for a gasoline outboard motor, comprising a stepper motor, an ECU connection port mounted on the upper end of the stepper motor, a valve core mounted on the lower end of the stepper motor via an output shaft, a gas filler valve mounting base mounted on the lower end of the stepper motor, a lower pipe mounted on the lower end of the gas filler valve mounting base, an air outlet channel formed inside the lower pipe, a gas filler valve round tube mounted on the side end of the gas filler valve mounting base, an air inlet formed inside the gas filler valve round tube, and a connection port formed directly below the valve core inside the gas filler valve mounting base, the two ends of the connection port being connected to the air inlet and the air outlet channel, respectively.

[0007] Preferably, a spring is mounted on the surface of the lower output shaft of the stepper motor, and the lower end of the spring is connected to the upper end of the valve core.

[0008] Preferably, extension plates are symmetrically installed on both sides of the stepper motor and the air supply valve mounting base. The surface of the extension plate is provided with threaded grooves, and the stepper motor and the air supply valve tube are connected through the extension plates and the threaded grooves.

[0009] Preferably, a large O-ring is installed on the surface of the lower pipe, and a small O-ring is provided at the connection between the stepper motor and the air supply valve mounting seat.

[0010] Preferably, a side pipe is installed on the side wall of the air supply valve mounting base, and multiple positioning keys are installed in a circumferential array on the surface of the side pipe.

[0011] Preferably, a connecting ring is installed at the upper end of the gas replenishment valve circular tube, and multiple mounting grooves are equidistantly opened on the surface of the connecting ring, and the multiple mounting grooves are used in conjunction with multiple positioning keys.

[0012] Preferably, each of the left and right side walls of the air replenishment valve mounting base is equipped with an air replenishment valve mounting hole.

[0013] Preferably, the valve core has a frustum-shaped structure, and when the air supply valve is closed, the valve core fits tightly with the internal air passage of the air supply valve mounting seat to achieve zero leakage.

[0014] A method for using a gas filler valve assembly for a gasoline outboard motor includes the following steps; S1 Signal Acquisition and Operating Condition Monitoring: During engine operation, the ECU acquires the throttle position signal in real time and simultaneously monitors the throttle opening status. S2 trigger injection judgment: When the ECU detects that the throttle signal suddenly decreases or becomes 0, and the throttle valve rapidly reduces its opening to close to 0 degrees, it determines that it has entered the injection condition. S3 Electronically Controlled Air Injection: The ECU outputs a control signal to the stepper motor of the air injection valve, and the stepper motor drives the valve core to rise against the spring elastic force, thus opening the air injection valve; S4 performs air replenishment: external air enters the outlet channel through the round pipe of the air replenishment valve and the internal air passage of the air replenishment valve mounting seat to complete the air replenishment; S5 Reset and Close Injection Valve: After the engine returns to normal operating conditions, the ECU stops outputting control signals, the valve core resets under the action of the spring, and the injection valve closes.

[0015] Compared with the prior art, the beneficial effects of the present invention are: The air replenishment valve assembly of this gasoline outboard motor uses a stepper motor directly controlled by the ECU to drive the air replenishment valve. It receives signals and acts synchronously with the throttle valve, completely solving the problem of lag in response of traditional spring-type air replenishment valves. The timing of air replenishment opening and closing is precisely matched to engine emergency stop, idling, and sudden speed drop conditions, significantly improving the real-time control of the system and ensuring that the intake adjustment is delayed and without deviation throughout the entire process.

[0016] The air replenishment valve assembly of this gasoline outboard motor features a frustum-shaped valve core that fits tightly against the air passage of the air replenishment valve mounting seat when closed. Combined with a double O-ring sealing structure, this achieves zero leakage when the valve is closed. Compared to traditional spring-loaded air replenishment valves, which are susceptible to poor sealing due to negative pressure, this structure offers superior airtightness and reduces mechanical impact, effectively extending the service life of the air replenishment valve assembly.

[0017] The air-fuel injection valve assembly in this gasoline outboard motor precisely controls the amount of air injected, promptly diluting an overly rich mixture and maintaining the air-fuel ratio within a reasonable range. This effectively improves incomplete combustion, reduces carbon buildup, lowers pollutant emissions and spark plug contamination, significantly improves fuel economy, and reduces engine maintenance and operating costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention in disassembled state; Figure 2 This is a cross-sectional view of the overall structure of the present invention; Figure 3 This is a schematic diagram illustrating the working principle of the intake system of the present invention.

[0019] In the diagram: 1. Motor connection to ECU port; 2. Stepper motor; 3. Small O-ring seal; 4. Air replenishment valve mounting base; 5. Spring; 6. Valve core; 7. Air replenishment valve round tube; 8. Air replenishment valve mounting hole; 9. Large O-ring seal; 10. Air inlet; 11. Air outlet channel; 12. Lower pipe; 13. Threaded groove; 14. Extension plate; 15. Connection port; 16. Side pipe; 17. Positioning key; 18. Mounting groove; 19. Connecting ring. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] like Figures 1 to 3 As shown, the gas filler valve assembly of the gasoline outboard motor in this embodiment includes a stepper motor 2. The upper end of the stepper motor 2 is equipped with a motor-to-ECU port 1, which receives control commands from the engine electronic control unit to achieve stable transmission of electronic control signals. The lower end of the stepper motor 2 is equipped with a valve core 6 via an output shaft. The stepper motor 2, as the core drive component, provides precise power for the opening and closing of the valve core 6. The valve core 6 controls the opening and closing of the air passage. The lower end of the stepper motor 2 is equipped with a gas filler valve mounting base 4, which provides a stable mounting base and a sealed air passage for the stepper motor 2, valve core 6, gas filler valve tube 7, and other components. The lower end of the gas filler valve mounting base 4 is equipped with a lower pipe 12, which reliably connects the gas filler valve assembly to the outlet passage 11. The internal air passage directly connects to the outlet passage 11 to achieve gas filler delivery. The lower pipe 12 has an air outlet passage 11 inside. The side end of the air replenishment valve mounting seat 4 is equipped with an air replenishment valve round pipe 7. The air replenishment valve round pipe 7 is used to introduce clean air from the outside. The air inlet 10 provides the air source inlet for air replenishment. The air replenishment valve round pipe 7 has an air inlet 10 inside. The valve core 6 inside the air replenishment valve mounting seat 4 has a connection port 15 directly below it. The two ends of the connection port 15 are connected to the air inlet 10 and the air outlet passage 11, respectively. The connection port 15 serves as an air circuit transfer channel to ensure that the outside air can flow smoothly and unobstructedly from the air replenishment valve round pipe 7 into the air outlet passage 11, thereby constructing a complete and independent electronically controlled air replenishment system. It can actively replenish air to the air outlet passage 11 when the engine stops suddenly, idles, or the speed drops sharply, effectively preventing the air outlet passage 11 from being deformed and damaged due to high negative pressure. At the same time, it improves the air-fuel mixture concentration and enhances the engine's operating stability and fuel economy.

[0023] Specifically, a spring 5 is installed on the surface of the lower output shaft of the stepper motor 2. The lower end of the spring 5 is connected to the upper end of the valve core 6. The spring 5 is sleeved on the outside of the output shaft of the stepper motor 2, with the upper end relatively fixed and the lower end tightly connected to the top surface of the valve core 6. When the air replenishment valve is opened, it is stretched or compressed to store elastic potential energy. After the air replenishment ends and the electronic control signal disappears, the elastic force is released, quickly pushing the valve core 6 back to the closed position. The structure of the spring 5 can ensure that the valve core 6 resets in time and closes in place, avoiding air leakage caused by the valve core 6 being stuck or returning slowly. At the same time, it effectively buffers the mechanical impact during the movement of the valve core 6, reduces the wear between the valve core 6 and the air passage of the mounting seat, and significantly improves the working reliability and overall service life of the air replenishment valve.

[0024] Furthermore, extension plates 14 are symmetrically installed on both sides of the stepper motor 2 and the air replenishment valve mounting base 4. The surface of the extension plates 14 is provided with threaded grooves 13. The stepper motor 2 and the air replenishment valve round tube 7 are connected through the extension plates 14 and the threaded grooves 13. The symmetrically arranged extension plates 14 provide a uniform force-bearing surface. The threaded grooves 13 are used to cooperate with bolts to achieve a detachable rigid connection, which can ensure accurate positioning and firm assembly between the stepper motor 2 and the air replenishment valve mounting base 4. They will not loosen or misalign under long-term vibration conditions of the outboard motor, while maintaining the coaxiality and sealing of the internal air passage, avoiding problems such as air leakage and unstable air intake caused by connection gaps.

[0025] Furthermore, a large O-ring 9 is installed on the surface of the lower pipe 12, and a small O-ring 3 is provided at the connection between the stepper motor 2 and the air supply valve mounting seat 4. The large O-ring 9 is installed on the outer wall of the lower pipe 12 to fill the gap between the mating surface of the lower pipe 12 and the air outlet channel 11, preventing gas leakage or the entry of water vapor and impurities. The small O-ring 3 is set between the mating end faces of the stepper motor 2 and the air supply valve mounting seat 4 to ensure the sealing reliability between the drive component and the valve body. The double sealing structure can significantly improve the pressure resistance and sealing performance of the valve body, effectively avoiding problems such as air leakage and negative pressure loss during the air supply process.

[0026] Furthermore, a side pipe 16 is installed on the side wall of the air supply valve mounting base 4. Multiple positioning keys 17 are installed in a circumferential array on the surface of the side pipe 16. A connecting ring 19 is installed at the upper end of the air supply valve circular pipe 7. Multiple mounting grooves 18 are equidistantly opened on the surface of the connecting ring 19. The multiple mounting grooves 18 are used in conjunction with the multiple positioning keys 17. The connecting ring 19 enhances the structural strength of the end of the circular pipe. The equidistantly distributed mounting grooves 18 and positioning keys 17 are matched one-to-one to form a three-in-one connection effect of positioning, anti-rotation, and fastening. This can quickly complete the alignment and installation, eliminating the need for repeated angle adjustments. It effectively prevents the circular pipe from rotating or falling off during use, ensuring that the air inlet 10 is always aligned and connected with the internal connection port 15, ensuring smooth air intake, stable and controllable air supply, and improving the overall consistency and reliability of the system.

[0027] Furthermore, each of the left and right side walls of the air replenishment valve mounting base 4 is equipped with an air replenishment valve mounting hole 8. The air replenishment valve mounting hole 8 is used to fit bolts to firmly install the entire air replenishment valve assembly in the preset position of the air outlet channel 11. The installation is simple, the positioning is accurate, the connection strength is high, and it can withstand the continuous vibration and impact during the operation of the outboard motor, so as to avoid the assembly from shifting or loosening and affecting the air replenishment effect.

[0028] Furthermore, the valve core 6 has a frustum-shaped structure. When the air replenishment valve is closed, the valve core 6 fits tightly with the internal air passage of the air replenishment valve mounting seat 4 to achieve zero leakage. When the valve is fully closed, the outer surface of the frustum-shaped valve core 6 fits completely with the inner wall of the internal air passage of the air replenishment valve mounting seat 4 to form a surface seal structure, achieving zero leakage in the closed state. This can prevent uncontrolled air from entering and interfering with the air-fuel mixture concentration under normal engine operating conditions, and can also provide precise and controllable intake air volume during air replenishment, effectively improving fuel economy, reducing carbon deposits, exhaust pollutant emissions and spark plug contamination, and improving the overall engine performance.

[0029] A method for using a gas filler valve assembly for a gasoline outboard motor includes the following steps; S1 Signal Acquisition and Operating Condition Monitoring: During engine operation, the ECU acquires the throttle position signal in real time and monitors the throttle opening status simultaneously. When the engine is in normal operation, the ECU continuously and in real time acquires the throttle position sensor signal and simultaneously monitors operating condition parameters such as throttle opening, engine speed, and exhaust passage 11 pressure to comprehensively determine the current operating status of the engine and provide accurate data for air replenishment control. S2 triggers air replenishment judgment: When the ECU detects that the throttle signal suddenly decreases or becomes 0, or the throttle valve rapidly reduces its opening to close to 0 degrees, it determines that it has entered the air replenishment condition. When the ECU detects through data analysis that the throttle signal suddenly decreases significantly or becomes zero, or the throttle valve rapidly reduces its opening to close to 0 degrees under electronic control, it determines that the engine has entered a special condition of emergency stop, idling, or sudden drop in speed. At this time, the exhaust passage 11 is very likely to form a high negative pressure and the air-fuel mixture may be too rich. The ECU immediately triggers the air replenishment control program and prepares to start the air replenishment valve assembly. S3 Electronically Controlled Air Intake: The ECU outputs a control signal to the stepper motor 2 of the air intake valve. The stepper motor 2 drives the valve core 6 to rise against the elastic force of the spring 5, and the air intake valve opens. The ECU outputs a corresponding PWM control signal to the stepper motor 2 of the air intake valve. After receiving the signal, the stepper motor 2 starts to move and drives the valve core 6 to move upward through the output shaft. The valve core 6 rises smoothly against the elastic force of the spring 5, so that a controllable air intake gap is formed between the valve core 6 and the internal air passage of the air intake valve mounting seat 4. The air intake valve opens stably according to the set opening degree to achieve precise air intake control. S4 performs air replenishment: External air enters the outlet passage 11 through the round pipe 7 of the air replenishment valve and the internal air passage of the air replenishment valve mounting seat 4 to complete the air replenishment. External clean air enters through the trumpet-shaped air inlet of the round pipe 7 of the air replenishment valve, flows through the connection port 15 along the internal air passage, and enters the outlet passage 11 smoothly and steadily under the action of pressure difference, quickly replenishing the intake volume reduced due to the sudden closure of the throttle valve, reducing the negative pressure value in the outlet passage 11, and diluting the overly rich mixture to restore the air-fuel ratio to a reasonable range. S5 Reset and Close Injection Valve: After the engine returns to normal operating conditions, the ECU stops outputting control signals, the valve core 6 resets under the action of the spring 5, and the injection valve closes. When the engine speed rises, the throttle signal returns to normal, or the throttle valve reopens to its normal opening, the ECU determines that the injection operation has ended and immediately stops outputting control signals to the stepper motor 2. The valve core 6 quickly resets downwards under the elastic restoring force of the spring 5, and re-fits tightly with the internal air passage of the injection valve mounting seat 4. The injection valve is completely closed, and the engine returns to normal intake mode.

[0030] In this embodiment, during the operation of the outboard motor, the ECU identifies the throttle position signal and controls the throttle opening. At this time, air passes through the air filter and enters the exhaust passage 11 through the throttle. When the throttle signal suddenly decreases or becomes 0, the ECM controls the throttle to reduce the opening until it approaches 0 degrees. At the same time, a control signal is output to the air replenishment valve assembly, the air replenishment valve stepper motor 2 starts to work, the valve core 6 rises against the elastic force of the spring 5, the intake valve opens, and the air then enters the exhaust passage 11 through the cavity of the air replenishment valve for replenishment.

[0031] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A gas filler valve assembly for a gasoline outboard motor, comprising a stepper motor (2), characterized in that: The upper end of the stepper motor (2) is equipped with a motor connection ECU port (1), the lower end of the stepper motor (2) is equipped with a valve core (6) through the output shaft, the lower end of the stepper motor (2) is equipped with a supplementary air valve mounting seat (4), the lower end of the supplementary air valve mounting seat (4) is equipped with a lower pipe (12), the lower pipe (12) has an air outlet channel (11) inside, the air outlet channel extends into the external intake manifold, the side end of the supplementary air valve mounting seat (4) is equipped with a supplementary air valve round tube (7), the air inlet (10) is opened inside the supplementary air valve round tube (7), the valve core (6) inside the supplementary air valve mounting seat (4) has a connection port (15) directly below, the two ends of the connection port (15) are connected to the air inlet (10) and the air outlet channel (11) respectively.

2. The air supply valve assembly for a gasoline outboard motor according to claim 1, characterized in that: A spring (5) is mounted on the surface of the lower output shaft of the stepper motor (2), and the lower end of the spring (5) is connected to the upper end of the valve core (6).

3. The air supply valve assembly for a gasoline outboard motor according to claim 1, characterized in that: Both sides of the stepper motor (2) and the air supply valve mounting base (4) are symmetrically equipped with extension plates (14). The surface of the extension plate (14) is provided with threaded grooves (13). The stepper motor (2) and the air supply valve round tube (7) are connected through the extension plate (14) and the threaded grooves (13).

4. The air supply valve assembly for a gasoline outboard motor according to claim 1, characterized in that: The surface of the lower pipe (12) is fitted with a large O-ring seal (9), and the connection between the stepper motor (2) and the air supply valve mounting seat (4) is fitted with a small O-ring seal (3).

5. The air supply valve assembly for a gasoline outboard motor according to claim 1, characterized in that: The side wall of the air supply valve mounting base (4) is equipped with a side pipe (16), and a plurality of positioning keys (17) are installed on the circumferential array of the surface of the side pipe (16).

6. The air supply valve assembly for a gasoline outboard motor according to claim 5, characterized in that: The upper end of the gas replenishment valve tube (7) is equipped with a connecting ring (19). The surface of the connecting ring (19) is provided with multiple mounting grooves (18) at equal intervals. The multiple mounting grooves (18) are used in conjunction with multiple positioning keys (17).

7. The air supply valve assembly for a gasoline outboard motor according to claim 1, characterized in that: The left and right side walls of the air replenishment valve mounting base (4) are each equipped with an air replenishment valve mounting hole (8).

8. The air supply valve assembly for a gasoline outboard motor according to claim 1, characterized in that: The valve core (6) has a frustum structure. When the air supply valve is closed, the valve core (6) and the air supply valve mounting seat (4) are tightly fitted together to achieve zero leakage.

9. The method of using the air supply valve assembly of the gasoline outboard motor according to claim 1, characterized in that: Includes the following steps; S1 Signal Acquisition and Operating Condition Monitoring: During engine operation, the ECU acquires the throttle position signal in real time and simultaneously monitors the throttle opening status. S2 trigger injection judgment: When the ECU detects that the throttle signal suddenly decreases or becomes 0, and the throttle valve rapidly reduces its opening to close to 0 degrees, it determines that it has entered the injection condition. S3 Electronically controlled air replenishment: The ECU outputs a control signal to the stepper motor (2) of the air replenishment valve. The stepper motor (2) drives the valve core (6) to rise against the elastic force of the spring (5), and the air replenishment valve opens. S4 performs air replenishment: external air enters the outlet channel (11) through the round pipe (7) of the air replenishment valve and the internal air passage of the air replenishment valve mounting seat (4) to complete the air replenishment; S5 Reset and Close Injection Valve: After the engine returns to normal operating conditions, the ECU stops outputting control signals, the valve core (6) is reset under the action of the spring (5), and the injection valve is closed.

Images