Novel fuel oil leakage intelligent control system

Abstract

The invention discloses a novel fuel oil leakage intelligent control system, relates to the field of diesel engines, and solves the technical problem that the internal pressure of a main oil tank and an oil return tank is not uniform easily due to an existing monoblock pump diesel oil recovery mode. The system comprises a switch checking circuit and a liquid level sensor installed in an oil return tank, and the high-position switch state and the low-position switch state in the switch checking circuit are obtained, so that the highest liquid level value and the lowest liquid level value are obtained; the real-time liquid level value of fuel oil return is obtained through the liquid level sensor, and the real-time liquid level value of the fuel oil return is compared with the highest liquid level value and the lowest liquid level value to trigger a fuel oil return adjusting mechanism so as to adjust the real-time opening degree of the electric valve. The pressure of fuel from the fuel return tank to the main fuel tank is stable, the influence of the fuel pressure on the fuel tank is reduced, and the service life of the fuel tank is prolonged.

Description

Technical Field

[0001] The invention relates to the field of diesel engines, and more particularly to a novel intelligent fuel leakage control system. Background Art

[0002] With the continuous changes in customer needs, application scenarios, and the continuous upgrading of emission regulations, the reliability requirements of high-power diesel generator sets are getting higher and higher. Customers are increasingly concerned about the reuse of fuel leaked from single pumps, so how to recycle this part of diesel has become the focus of attention in the industry.

[0003] There are many existing ways to recycle this part of diesel, such as Figure 1 As shown, the method mainly adopts installing a high-level switch 4 and a low-level switch 5 in the return oil tank 2. An oil inlet 1 is provided above the return oil tank 2. The recovered diesel enters the return oil tank 2 from the oil inlet 1. When the diesel liquid level reaches the high-level switch 4, the high-level switch 4 is closed, thereby opening the electric valve 6 installed at the bottom oil outlet, so that the diesel is discharged from the bottom oil outlet back to the daily oil tank; when the diesel liquid level is lower than the low-level switch 5, the low-level switch 5 is disconnected, thereby closing the electric valve 6, so that the diesel liquid level is higher than the low-level switch. However, this method does not accurately control the electric valve 6, which may easily cause the recovered diesel to flow too fast or too slow from the return oil tank 2 to the main oil tank, thereby causing the pressure in the main oil tank to be too high or too low, which may easily cause the main oil tank to expand or contract, reducing the service life of the main oil tank, and also affect the pressure in the return oil tank 2, causing the return oil tank 2 to expand or contract, reducing the service life of the return oil tank 2. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a new intelligent fuel leakage control system in view of the deficiencies in the prior art, so as to solve the technical problem that the existing method of recovering diesel from a single pump easily leads to uneven pressure inside the main fuel tank and the return fuel tank.

[0005] A novel intelligent fuel leakage control system according to the present invention comprises a switch inspection circuit and a liquid level sensor installed inside a fuel return tank, obtaining a high-position switch state and a low-position switch state in the switch inspection circuit, triggering a switch inspection mechanism according to the high-position switch state and the low-position switch state to make an initial judgment on the high-position switch and the low-position switch;

[0006] The real-time liquid level value of the fuel return is obtained through the liquid level sensor, and the real-time liquid level value of the fuel return is compared with a preset maximum liquid level value and a preset minimum liquid level value to trigger the fuel return adjustment mechanism to adjust the real-time opening of the electric valve.

[0007] As a further improvement, the switch check circuit includes an intermediate relay, the positive pole of the external power supply is electrically connected to the negative pole of the external power supply through a high-position switch, a low-position switch and a coil of the intermediate relay connected in series; the positive pole of the external power supply is electrically connected to the negative pole of the external power supply through the second normally open switch of the intermediate relay connected in series and the motor of the electric valve; the first normally open switch of the intermediate relay is connected in parallel with the high-position switch.

[0008] Furthermore, the fuel return adjustment mechanism is:

[0009] When the real-time liquid level value of the fuel return oil is equal to the preset maximum liquid level value, the real-time opening of the electric valve is adjusted to the maximum; when the real-time liquid level value of the fuel return oil is equal to the preset minimum liquid level value, the electric valve is closed; when the real-time liquid level value of the fuel return oil is greater than the minimum liquid level value and less than the maximum liquid level value, the real-time opening of the electric valve is adjusted according to the real-time liquid level value of the fuel return oil.

[0010] Furthermore, the system for adjusting the real-time opening of the electric valve according to the real-time liquid level value of the fuel return oil is:

[0011] Setting a liquid level cycle, obtaining a real-time liquid level value in the liquid level cycle, comparing the real-time liquid level value in the liquid level cycle with the real-time liquid level value in the previous liquid level cycle, and not adjusting the opening of the electric valve when the real-time liquid level value in the liquid level cycle is consistent with the real-time liquid level value in the previous liquid level cycle;

[0012] When the real-time liquid level value in the liquid level cycle is inconsistent with the real-time liquid level value in the previous liquid level cycle, the real-time liquid level value in the liquid level cycle is subtracted from the real-time liquid level value in the previous liquid level cycle to obtain the liquid level difference, and the real-time opening of the electric valve is adjusted according to the liquid level difference through the PID controller.

[0013] Furthermore, the method for adjusting the real-time opening of the electric valve is to input the liquid level difference into a PID controller to obtain an output opening, and map the output opening into a real-time opening.

[0014] Furthermore, the liquid level difference is input into the PID controller to obtain the expression of the output opening:

[0015]

[0016] Where c is the liquid level difference, K p is the proportionality coefficient, K i is the integration coefficient, K d is the differential coefficient, O is the output opening value, is the differential value of the liquid level difference, and ∫cdt is the integral value of the liquid level difference.

[0017] Beneficial Effects

[0018] The advantages of the present invention are:

[0019] The present invention comprises a switch inspection circuit and a liquid level sensor installed in a return oil tank, and obtains a high-position switch state and a low-position switch state in the switch inspection circuit, thereby obtaining a maximum liquid level value and a minimum liquid level value; obtains a real-time liquid level value of the fuel return oil by means of the liquid level sensor, and compares the real-time liquid level value of the fuel return oil with the maximum liquid level value and the minimum liquid level value respectively to trigger a fuel return oil regulating mechanism to regulate the real-time opening of an electric valve, so as to stabilize the flow of fuel from the return oil tank to the main oil tank, prevent the situation that the pressure in the return oil tank and the main oil tank is uneven due to excessively fast or high fuel flow, reduce the influence of the fuel flow pressure on the oil tank, and increase the service life of the oil tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The overall structural diagram of the existing fuel leakage recovery system is shown in FIG.

[0021] Figure 2 It is a schematic diagram of the overall structure of the intelligent fuel leakage system of the present invention;

[0022] Figure 3 A circuit diagram of a switch inspection circuit of the present invention;

[0023] Figure 4 This is a flow chart of the intelligent fuel leakage control system of the present invention.

[0024] Among them: 1-oil inlet, 2-oil return tank, 3-fixed rod, 4-high liquid level sensing structure, 5-low level switch, 6-electric valve, 7-liquid level sensor, KA-coil of intermediate relay, KA1-first normally open switch of intermediate relay, KA2-second normally open switch of intermediate relay, G-motor of electric valve. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the embodiments, but it does not constitute any limitation to the present invention. Any limited number of modifications made by anyone within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0026] See also Figure 2-Figure 4 The present invention discloses a novel intelligent fuel leakage control system, which includes a switch check circuit and a liquid level sensor 7 installed in the fuel return tank 2, and obtains the state of the high-level switch 4 and the state of the low-level switch 5 in the switch check circuit, thereby obtaining the highest liquid level value and the lowest liquid level value. The liquid level sensor 7 in the present invention is a photoelectric liquid level sensor. The highest liquid level value corresponds to the high-level switch 4, and the lowest liquid level value corresponds to the low-level switch 5.

[0027] The real-time liquid level value of the fuel return is obtained through the liquid level sensor 7, and the real-time liquid level value of the fuel return is compared with the maximum liquid level value and the minimum liquid level value to trigger the fuel return adjustment mechanism to adjust the real-time opening of the electric valve 6. Ensure that the pressure of the fuel from the return tank 2 to the main tank is stable, reduce the impact of the fuel flow pressure on the tank, and increase the service life of the tank.

[0028] from Figure 3 It can be seen that the switch check circuit includes an intermediate relay, and the positive pole of the external power supply is electrically connected to the negative pole of the external power supply through the high-position switch 4, the low-position switch 5 and the coil KA of the intermediate relay connected in series; the positive pole of the external power supply is electrically connected to the negative pole of the external power supply through the second normally open switch KA2 of the intermediate relay connected in series and the motor G of the electric valve; the first normally open switch KA1 of the intermediate relay is connected in parallel with the high-position switch 4.

[0029] from Figure 4 It can be seen that the fuel return adjustment mechanism is:

[0030] When the real-time liquid level value of the fuel return oil is equal to the maximum liquid level value, the real-time opening of the electric valve 7 is adjusted to the maximum; when the real-time liquid level value of the fuel return oil is equal to the minimum liquid level value, the electric valve 7 is closed; when the real-time liquid level value of the fuel return oil is greater than the minimum liquid level value and less than the maximum liquid level value, the real-time opening of the electric valve 7 is adjusted according to the real-time liquid level value of the fuel return oil.

[0031] The method for adjusting the real-time opening of the electric valve 7 according to the real-time liquid level value of the fuel return oil is:

[0032] Set the liquid level cycle, obtain the real-time liquid level value in the liquid level cycle, compare the real-time liquid level value in the liquid level cycle with the real-time liquid level value in the previous liquid level cycle, and when the real-time liquid level value in the liquid level cycle is consistent with the real-time liquid level value in the previous liquid level cycle, do not adjust the real-time opening of the electric valve 7.

[0033] When the real-time liquid level value in this liquid level cycle is inconsistent with the real-time liquid level value in the previous liquid level cycle, the real-time liquid level value in this liquid level cycle is subtracted from the real-time liquid level value in the previous liquid level cycle to obtain the liquid level difference, and the real-time power of the electric valve 7 and the real-time opening of the valve 8 are adjusted according to the liquid level difference through the PID controller.

[0034] The method for adjusting the real-time opening of the electric valve 7 is to input the liquid level difference into the PID controller to obtain the output opening, and map the output opening to the real-time opening.

[0035] The expression of output opening obtained by inputting the liquid level difference into the PID controller is:

[0036]

[0037] Where c is the liquid level difference, K p is the proportionality coefficient, K i is the integration coefficient, K d is the differential coefficient, O is the output opening, is the differential value of the liquid level difference, and ∫cdt is the integral value of the liquid level difference.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A new type of intelligent fuel leakage control system, characterized in that: The system comprises a switch inspection circuit and a liquid level sensor (7) installed in an oil return tank (2), and obtains the state of a high-level switch (4) and the state of a low-level switch (5) in the switch inspection circuit, thereby obtaining a maximum liquid level value and a minimum liquid level value; The real-time liquid level value of the fuel return is obtained through the liquid level sensor (7), and the real-time liquid level value of the fuel return is compared with the maximum liquid level value and the minimum liquid level value respectively to trigger the fuel return adjustment mechanism to adjust the real-time opening of the electric valve (6).

2. According to claim 1, a new type of intelligent fuel leakage control system is characterized in that: The switch inspection circuit comprises an intermediate relay, wherein the positive pole of the external power supply is electrically connected to the negative pole of the external power supply via a high-position switch (4), a low-position switch (5) and a coil (KA) of the intermediate relay connected in series; the positive pole of the external power supply is electrically connected to the negative pole of the external power supply via a second normally open switch (KA2) of the intermediate relay and a motor (G) of the electric valve connected in series; and the first normally open switch (KA1) of the intermediate relay is connected in parallel to the high-position switch (4).

3. According to claim 1, a new intelligent fuel leakage control system is characterized in that: The fuel return adjustment mechanism is: When the real-time liquid level value of the fuel return oil is equal to the maximum liquid level value, the real-time opening of the electric valve (7) is adjusted to the maximum; when the real-time liquid level value of the fuel return oil is equal to the minimum liquid level value, the electric valve (7) is closed; when the real-time liquid level value of the fuel return oil is greater than the minimum liquid level value and less than the maximum liquid level value, the real-time opening of the electric valve (7) is adjusted according to the real-time liquid level value of the fuel return oil.

4. A new type of intelligent fuel leakage control system according to claim 3, characterized in that: The method for adjusting the real-time opening of the electric valve (7) according to the real-time liquid level value of the fuel return oil is as follows: Setting a liquid level cycle, obtaining a real-time liquid level value in the liquid level cycle, comparing the real-time liquid level value in the liquid level cycle with the real-time liquid level value in the previous liquid level cycle, and when the real-time liquid level value in the liquid level cycle is consistent with the real-time liquid level value in the previous liquid level cycle, not adjusting the real-time opening of the electric valve (7); When the real-time liquid level value in the liquid level cycle is inconsistent with the real-time liquid level value in the previous liquid level cycle, the real-time liquid level value in the liquid level cycle is subtracted from the real-time liquid level value in the previous liquid level cycle to obtain a liquid level difference, and the real-time power of the electric valve (7) and the real-time opening of the valve (8) are adjusted according to the liquid level difference through a PID controller.

5. A novel intelligent fuel leakage control system according to claim 4, characterized in that: The method for adjusting the real-time opening of the electric valve (7) is to input the liquid level difference into a PID controller to obtain an output opening, and map the output opening into a real-time opening.

6. A novel intelligent fuel leakage control system according to claim 5, characterized in that: The liquid level difference is input into the PID controller to obtain the expression of output opening: Where c is the liquid level difference, K p is the proportionality coefficient, K i is the integration coefficient, K d is the differential coefficient, O is the output opening, is the differential value of the liquid level difference, and ∫cdt is the integral value of the liquid level difference.

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