A vibration reduction system for fuel tanks of engineering machinery and its control method

Abstract

This invention discloses a vibration damping system for a fuel tank of engineering machinery and its control method, comprising: an air spring damper, disposed between the fuel tank and the vehicle frame, for mounting and vibration damping of the fuel tank; a tilt sensor, disposed on the fuel tank, for monitoring the tilt angle of the fuel tank; a level gauge, disposed inside the fuel tank, for monitoring the fuel level in the fuel tank; and a PLC controller, which acquires the tilt signal of the fuel tank measured by the tilt sensor and the fuel level signal measured by the level gauge, calculates the average value of several sets of valid fuel level data, and controls the internal pressure of the air spring damper according to the optimal matching relationship between the fuel level value and the internal pressure of the air spring damper. This invention can adjust the stiffness of the vibration damping system according to the fuel tank level, ensuring that the vibration damping performance of the system is optimal at all fuel level ranges, effectively isolating vibrations transmitted to the fuel tank from the road surface, engine, and working equipment.

Description

Technical Field

[0001] This invention belongs to the field of engineering machinery technology and relates to a vibration reduction system for fuel tanks of engineering machinery and its control method. Background Technology

[0002] As a component for storing fuel, the fuel tank of construction machinery is characterized by its large volume. Due to the harsh working conditions of construction machinery, road surface excitation, working device excitation, engine excitation, and the impact of oil sloshing are transmitted to the fuel tank, which can cause the fuel tank welds to crack and leak, reduce the service life of the fuel tank, increase safety hazards during operation, and also cause pollution to the work site.

[0003] Existing technologies typically employ rubber vibration dampers or mechanisms placed between the fuel tank and the vehicle frame to attenuate vibrations transmitted to the fuel tank from the outside. However, during the actual operation of construction machinery, the fuel level in the tank changes in real time, causing the system's natural frequency to shift accordingly. Due to the inherent stiffness characteristics of the relevant elastic elements, the vibration damping performance cannot cover the entire fuel tank level range. Therefore, developing a vibration damping system with stiffness characteristics adjustable according to the fuel level in the tank is of paramount importance. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a vibration damping system for a fuel tank of engineering machinery and its control method. The system can adjust the stiffness of the vibration damping system according to the fuel tank level, ensuring that the vibration damping performance of the system on the fuel tank is in an optimal state at each fuel level, and effectively isolating the vibrations transmitted to the fuel tank from the road surface, engine and working device.

[0005] To achieve the above objectives, the present invention is implemented using the following technical solution:

[0006] A vibration damping system for a fuel tank of construction machinery, characterized in that it comprises:

[0007] An air spring damper is installed between the fuel tank and the vehicle frame for the installation of the fuel tank and vibration damping.

[0008] An inclination sensor, which is mounted on the fuel tank, is used to monitor the tilt angle of the fuel tank.

[0009] A level gauge, which is installed inside the fuel tank, is used to monitor the fuel level in the fuel tank;

[0010] The PLC controller is used to acquire the tilt signal of the fuel tank measured by the tilt sensor and the oil level signal measured by the level gauge, and to confirm the validity of the oil level signal through the tilt signal, calculate the average value of several sets of valid oil level data; and control the internal pressure of the air spring damper according to the optimal matching relationship between the oil level value and the internal pressure of the air spring damper, thereby adjusting the stiffness of the air spring damper.

[0011] Optionally, the tilt sensor includes a first tilt sensor for monitoring the pitch angle of the fuel tank and a second tilt sensor for monitoring the side tilt angle of the fuel tank. The first tilt sensor is located on the top of the fuel tank, and the second tilt sensor is located on the side wall of the fuel tank.

[0012] Optionally, the optimal matching relationship between the internal pressure and oil level of the air spring damper can be determined through real-vehicle testing based on the characteristics of the air spring damper itself, the cross-sectional area of ​​the fuel tank, and the type of fuel; or it can be determined based on the air spring stiffness k.

[0013] k = 0.16f 2 π 2 (ρ 燃油 sh+m 燃油箱 )

[0014] Where f is the main excitation frequency at the connection between the air spring damper and the vehicle frame under operating conditions; ρ 燃油 Where is the density of the fuel; S is the cross-sectional area of ​​the fuel tank; h is the depth of the fuel in the fuel tank, measured by the level gauge 10; m 燃油箱 This refers to the mass of the fuel tank itself.

[0015] Optionally, the oil level data collected synchronously is valid when the absolute value of the pitch angle measured by the tilt sensor is ≤α and the absolute value of the roll angle is ≤β.

[0016] Optionally, the pitch angle α = 10° and the roll angle β = 10° are derived from the cross-sectional area of ​​the fuel tank, the stiffness characteristics of the air spring damper, and the operating characteristics of the construction machinery itself.

[0017] Optionally, it also includes: a fuel tank partition, the edge of which is connected to the wall of the fuel tank, the fuel tank partition having several mounting holes, a rubber damping diaphragm inside the mounting holes, the edge of the rubber damping diaphragm being connected to the wall of the mounting hole, and the rubber damping diaphragm having through holes for oil flow.

[0018] Optionally, the fuel tank partition has notches on its edges for oil flow.

[0019] Optionally, the edge thickness of the rubber damping diaphragm is greater than the center thickness.

[0020] Optionally, the rubber damping diaphragm is fixed to the mounting hole by vulcanization.

[0021] A control method for a vibration damping system of a fuel tank in engineering machinery includes:

[0022] The tilt sensor monitors the tilt angle of the fuel tank, and the level gauge monitors the fuel level in the fuel tank.

[0023] The PLC controller acquires the tilt angle signal of the fuel tank measured by the tilt sensor and the oil level signal measured by the level gauge;

[0024] The PLC controller confirms the validity of the oil level signal using the tilt angle signal;

[0025] When the PLC controller confirms that the oil level signal is valid, it calculates the average value of several sets of valid oil level data.

[0026] The PLC controller controls the internal pressure of the air spring damper based on the optimal matching relationship between the oil level and the internal pressure of the air spring damper, thereby adjusting the stiffness of the air spring damper.

[0027] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0028] This invention provides a vibration damping system for a fuel tank of engineering machinery and its control method. By adjusting the internal pressure of the air spring damper according to the collected fuel tank level data, the stiffness characteristics of the air spring damper are changed, which can ensure that the vibration damping performance of the air spring damper on the fuel tank is in an optimal state at each fuel level range, effectively reducing the vibration transmitted to the fuel tank from the engine, working device and road surface.

[0029] A rubber damping diaphragm is arranged on the fuel tank partition. When the fuel sloshes, the rubber damping diaphragm deforms under the impact of the fuel, which can absorb energy and attenuate the impact and vibration of the fuel on the fuel tank body. Attached Figure Description

[0030] Figure 1 The diagram shown is a schematic representation of an embodiment of the present invention;

[0031] Figure 2 As shown Figure 1 Internal diagram;

[0032] Figure 3 The diagram shown is a flowchart of the present invention.

[0033] In the diagram: 1. Frame; 2. Air spring shock absorber; 3. Fuel tank; 4. First tilt sensor; 5. Second tilt sensor; 6. Through hole; 7. Rubber damping diaphragm; 8. Fuel tank partition; 9. Notch; 10. Level gauge. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0035] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] Example 1

[0038] like Figure 1 and Figure 3 As shown, a vibration damping system for a fuel tank of engineering machinery is characterized by comprising:

[0039] Air spring damper 2 is used for the installation and vibration damping of fuel tank 3. The bottom end of air spring damper 2 is connected to the top surface of frame 1, and the top end of air spring damper 2 is connected to the bottom surface of fuel tank 3.

[0040] The tilt sensor is used to monitor the tilt angle of the fuel tank 3. The tilt sensor includes a first tilt sensor 4 for monitoring the pitch angle of the fuel tank 3 and a second tilt sensor 5 for monitoring the side tilt angle of the fuel tank 3. The first tilt sensor 4 is located on the top of the fuel tank 3, and the second tilt sensor 5 is located on the side wall of the fuel tank 3.

[0041] The level gauge 10 is used to monitor the fuel level in the fuel tank 3. The upper end of the level gauge 10 is connected to the inner top surface of the fuel tank 3, and the lower end of the level gauge 10 is connected to the inner bottom surface of the fuel tank 3.

[0042] Fuel tank partition 8, the edge of fuel tank partition 8 is welded to the inner wall of fuel tank 3, fuel tank partition 8 is provided with several mounting holes, rubber damping diaphragm 7 is provided in the mounting holes, the edge of rubber damping diaphragm 7 is fixed to the hole wall of the mounting hole by vulcanization, rubber damping diaphragm 7 is provided with through hole 6 for oil flow, the edge thickness of rubber damping diaphragm 7 is 0.5mm thicker than the middle thickness, the lower edge of fuel tank partition 8 is provided with notch 9 for oil flow, when oil sloshes, rubber damping diaphragm 7 will deform under the impact of oil, thereby absorbing energy and attenuating the impact and vibration of oil on fuel tank body 3;

[0043] The PLC controller's control system consists of a signal processing unit and a control unit. The signal processing unit acquires the tilt angle signal of the fuel tank 3 measured by the tilt angle sensor and the oil level signal measured by the level gauge 10. It confirms the validity of the oil level signal through the tilt angle signal, calculates the average value of 10 sets of valid oil level data in the last 10 minutes, and simultaneously sends a control signal to the control unit. The control unit controls the internal pressure of the air spring damper 2 according to the optimal matching relationship between the oil level value and the internal pressure of the air spring damper 2, thereby adjusting the stiffness of the air spring damper 2 and ensuring that the damping performance of the air spring damper 2 on the fuel tank 3 is in the best state at each oil level range.

[0044] The optimal matching relationship between the internal pressure and oil level of an air spring damper is determined through real-vehicle testing based on the characteristics of the air spring damper itself, the cross-sectional area of ​​the fuel tank, and the type of fuel; or it is determined based on the air spring stiffness k.

[0045] k = 0.16f 2 π 2 (ρ 燃油 sh+m 燃油箱 )

[0046] Where f is the main excitation frequency at the connection between the air spring damper and the vehicle frame under operating conditions; ρ 燃油 Where is the density of the fuel; S is the cross-sectional area of ​​the fuel tank; h is the depth of the fuel in the fuel tank, measured by the level gauge 10; m 燃油箱 The mass of the fuel tank body; based on the air spring stiffness characteristic curve, the internal pressure of the air spring damper is adjusted through the PLC control system so that the stiffness of the air spring damper reaches k.

[0047] When construction machinery is operating on a slope, there will be an error between the oil level data collected by the level gauge 10 and the actual value. In order to reduce the impact of this error on the control accuracy, the oil level data collected synchronously is valid when the absolute value of the pitch angle measured by the tilt sensor is ≤α and the absolute value of the roll angle is ≤β. Otherwise, it is considered invalid and cannot be used to calculate the average oil level value. The pitch angle α = 10° and the roll angle β = 10° are derived from the cross-sectional area of ​​the fuel tank, the stiffness characteristics of the air spring damper, and the operating characteristics of the construction machinery itself.

[0048] Example 2

[0049] like Figures 1 to 3 As shown, a control method for a vibration damping system of a fuel tank in engineering machinery includes:

[0050] S1, the first tilt sensor 4 monitors the pitch angle of the fuel tank 3; the second tilt sensor 5 monitors the side tilt angle of the fuel tank 3; the level gauge 10 monitors the fuel level in the fuel tank 3;

[0051] S2, the PLC controller signal processing unit acquires the tilt angle signal of the fuel tank 3 measured by the tilt angle sensor and the oil level signal measured by the level gauge 10;

[0052] S3, the PLC controller signal processing unit confirms the validity of the oil level signal through the tilt angle signal. When the absolute value of the pitch angle measured by the tilt angle sensor is ≤ α and the absolute value of the roll angle is ≤ β, the synchronously collected oil level data is valid.

[0053] S4, when the PLC controller signal processing unit confirms that the oil level signal is valid, calculate the average value of several sets of valid oil level data;

[0054] S5, the PLC controller control unit receives the average value of several sets of valid oil level data sent by the signal processing unit; based on the optimal matching relationship between the oil level value and the internal pressure of the air spring damper, it controls the internal pressure of the air spring damper, thereby adjusting the stiffness of the air spring damper.

[0055] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An engineered machine fuel tank vibration reduction system, characterized by, The application relates to a fuel tank and air spring damper system. The air spring damper is arranged between the fuel tank and the vehicle frame for mounting and damping the fuel tank. The inclination sensor is arranged on the fuel tank for monitoring the inclination angle of the fuel tank. The liquid level gauge is arranged in the fuel tank for monitoring the oil level of the fuel in the fuel tank. The PLC controller collects the inclination angle signal of the fuel tank measured by the inclination sensor and the oil level signal measured by the liquid level gauge, confirms the validity of the oil level signal through the inclination angle signal, calculates the average value of a plurality of groups of valid oil level data, controls the internal pressure of the air spring damper according to the optimal matching relationship between the oil level value and the internal pressure of the air spring damper, and adjusts the rigidity of the air spring damper. The inclination sensor comprises a first inclination sensor for monitoring the pitch angle of the fuel tank and a second inclination sensor for monitoring the roll angle of the fuel tank, the first inclination sensor is arranged on the upper tank top of the fuel tank, and the second inclination sensor is arranged on the side tank wall of the fuel tank. The optimal matching relationship between the internal pressure of the air spring damper and the oil level value is determined according to the air spring rigidity k. ； Wherein, f is the main exciting frequency of the air spring shock absorber and the frame connection under the working condition of the job; Wherein, f is the main exciting frequency of the air spring shock absorber and the frame connection under the working condition of the job; Wherein, f is the main exciting frequency of the air spring shock absorber and the frame connection under the working condition of the job; 2. An engineering machine fuel tank damping system according to claim 1, characterised in that: When the absolute value of the pitch angle and the absolute value of the roll angle measured by the inclination sensor are less than or equal to alpha and beta respectively, the synchronously collected oil level data are valid.

3. An engineering machine fuel tank damping system according to claim 2, characterised in that: The pitch angle alpha is 10 DEG and the roll angle beta is 10 DEG, which are obtained according to the cross-sectional area of the fuel tank, the rigidity characteristics of the air spring damper and the working characteristics of the engineering machinery.

4. An engineered machine fuel tank vibration reduction system as claimed in claim 1, wherein, The application further relates to a fuel tank partition plate. The plate edge of the fuel tank partition plate is connected with the tank wall of the fuel tank, a plurality of mounting holes are arranged on the fuel tank partition plate, a rubber damping film is arranged in the mounting hole, the edge of the rubber damping film is connected with the hole wall of the mounting hole, and a through hole for oil flow is arranged on the rubber damping film.

5. An engineering machine fuel tank damping system as claimed in claim 4, characterised in that: The plate edge of the fuel tank partition plate is provided with a gap for oil flow.

6. An engineering machine fuel tank damping system as claimed in claim 4, characterised in that: The edge thickness of the rubber damping film is greater than the middle thickness.

7. An engineered machine fuel tank damping system as claimed in claim 4, characterised in that: The rubber damping film is fixedly connected with the mounting hole through vulcanization.

8. A control method of a construction machine fuel tank damping system according to any one of claims 1 to 7, characterized by, The inclination sensor monitors the inclination angle of the fuel tank, and the liquid level gauge monitors the oil level of the fuel in the fuel tank. The PLC controller collects the inclination angle signal of the fuel tank measured by the inclination sensor and the oil level signal measured by the liquid level gauge. The PLC controller confirms the validity of the oil level signal through the inclination angle signal. When the PLC controller confirms that the oil level signal is valid, the average value of a plurality of groups of valid oil level data is calculated. The PLC controller controls the internal pressure of the air spring damper according to the optimal matching relationship between the oil level value and the internal pressure of the air spring damper, so as to adjust the rigidity of the air spring damper. ​

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