A new intelligent control system for fuel leakage

Abstract

The application discloses a novel fuel leakage intelligent control system and relates to the field of diesel engines, and solves the technical problem that the existing recovery single pump diesel mode is prone to causing uneven internal pressure of a main oil tank and an oil return tank. The system comprises a switch checking circuit and a liquid level sensor installed in the oil return tank, obtains a high-position switch state and a low-position switch state in the switch checking circuit, and thus obtains a highest liquid level value and a lowest liquid level value; the system obtains a real-time liquid level value of fuel return oil through the liquid level sensor, compares the real-time liquid level value of the fuel return oil with the highest liquid level value and the lowest liquid level value respectively, and triggers a fuel return oil adjusting mechanism to adjust a real-time opening degree of an electric valve. The application ensures stable pressure of fuel from the oil return tank to the main oil tank, reduces the influence of fuel pressure on the oil tank, and improves the service life of the oil tank.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of diesel engines, more particularly, it relates to a novel fuel leakage intelligent control system. BACKGROUND

[0002] With the continuous change of customer demand, application scene and the continuous upgrading of emission regulations, the reliability requirement of high-power diesel generator set is higher and higher. Customers are increasingly concerned about the leakage of single pump fuel recycling, so how to recycle and utilize this part of diesel has become the focus of the industry.

[0003] Most of the existing ways to recycle and utilize this part of diesel, such as Figure 1 As shown, mainly install high-level switch 4 and low-level switch 5 in the oil return tank 2, an oil inlet 1 is formed above the oil return tank 2, the recovered diesel oil enters the oil return tank 2 from the oil inlet 1, when the diesel oil 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 oil is discharged from the bottom oil outlet to the daily oil tank; when the diesel oil level is less than the low-level switch 5, the low-level switch 5 is disconnected, thereby closing the electric valve 6, so that the diesel oil level is higher than the low-level switch. However, this method does not accurately control the electric valve 6, which can easily cause the recovered diesel oil to flow too fast or too slow from the oil return tank 2 to the main oil tank, thereby causing the pressure in the main oil tank to be too large or too small, which can easily cause the main oil tank to expand or shrink, reducing the service life of the main oil tank, and also affecting the pressure in the oil return tank 2, causing the oil return tank 2 to expand or shrink, reducing the service life of the oil return tank 2. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a novel fuel leakage intelligent control system to solve the technical problem that the existing recycling of single pump diesel fuel method can easily cause uneven internal pressure of the main oil tank and the oil return tank.

[0005] The novel fuel leakage intelligent control system comprises a switch checking circuit and a liquid level sensor installed in the oil return tank, the high-level switch state and the low-level switch state in the switch checking circuit are obtained, and the switch checking mechanism is triggered according to the high-level switch state and the low-level switch state to make an initial judgment on the high-level switch and the low-level switch.

[0006] The real-time liquid level value of the fuel return is obtained by the liquid level sensor, and the real-time liquid level value of the fuel return is compared with the preset highest liquid level value and the preset lowest liquid level value to trigger the fuel return adjustment mechanism to adjust the real-time opening degree of the electric valve.

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

[0008] Further, the fuel oil return adjusting mechanism is,

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

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

[0011] A liquid level period is set, the real-time liquid level value in the liquid level period is obtained, the real-time liquid level value in the liquid level period is compared with the real-time liquid level value in the previous liquid level period, when the real-time liquid level value in the liquid level period is consistent with the real-time liquid level value in the previous liquid level period, the opening degree of the electric valve is not adjusted;

[0012] When the real-time liquid level value in the liquid level period is not consistent with the real-time liquid level value in the previous liquid level period, the real-time liquid level value in the liquid level period is subtracted from the real-time liquid level value in the previous liquid level period to obtain a liquid level difference value, and the real-time opening degree of the electric valve is adjusted according to the liquid level difference value through a PID controller.

[0013] Still further, the method for adjusting the real-time opening degree of the electric valve is that the liquid level difference value is input into the PID controller to obtain an output opening degree, and the output opening degree is mapped into the real-time opening degree.

[0014] Still further, the expression for inputting the liquid level difference value into the PID controller to obtain the output opening degree is,

[0015] ;

[0016] Wherein, c is the liquid level difference value, K p is the proportional coefficient, K i is the integral coefficient, K d is the differential coefficient, and O is the output opening degree value, is the differential value of the liquid level difference value, is the integral value of the liquid level difference value.

[0017] Advantages

[0018] The present application has the advantages of:

[0019] The present application comprises a switch checking circuit and a liquid level sensor installed in the oil return tank, the high switch state and the low switch state in the switch checking circuit are obtained, so as to obtain the highest liquid level value and the lowest liquid level value; the real-time liquid level value of the fuel return oil is obtained through the liquid level sensor, and the real-time liquid level value of the fuel return oil is compared with the highest liquid level value and the lowest liquid level value respectively to trigger the fuel return oil adjusting mechanism to adjust the real-time opening degree of the electric valve, so that the flow of the fuel from the oil return tank to the main tank is stable, the situation that the pressure in the oil return tank and the main tank is uneven due to too fast or too high fuel flow is prevented, the influence of the fuel flow pressure on the oil tank is reduced, and the service life of the oil tank is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a general structure schematic diagram of the existing fuel leakage recovery system;

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

[0022] Figure 3 It is a circuit diagram of the switch checking circuit of the present application;

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

[0024] Wherein: 1-inlet, 2-oil return tank, 3-fixed rod, 4-high liquid level sensing structure, 5-low 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 application will be further described in conjunction with the embodiments, but does not constitute any limitation to the present application, and any limited number of modifications made by anyone within the scope of the claims of the present application is still within the scope of the claims of the present application.

[0026] Reference Figures 2-4 The present application is a novel fuel leakage intelligent control system, which comprises a switch checking circuit and a liquid level sensor 7 installed in the oil return tank 2, the high switch 4 state and the low switch 5 state in the switch checking circuit are obtained, so as to obtain the highest liquid level value and the lowest liquid level value. The liquid level sensor 7 in the present application is an optical liquid level sensor. The highest liquid level value corresponds to the high switch 4, and the lowest liquid level value corresponds to the low switch 5.

[0027] The real-time liquid level value of the fuel return oil is obtained by the liquid level sensor 7, and the real-time liquid level value of the fuel return oil is compared with the highest liquid level value and the lowest liquid level value to trigger the fuel return oil adjustment mechanism to adjust the real-time opening degree of the electric valve 6. The pressure of the fuel from the return tank 2 to the main tank is stabilized, the influence of the fuel flow pressure on the tank is reduced, and the service life of the tank is improved.

[0028] From Figure 3 It can be seen that the switch checking circuit includes an intermediate relay, the positive pole of the external power supply is electrically connected with the negative pole of the external power supply through the series connection of the high switch 4, the low switch 5 and the coil KA of the intermediate relay; the positive pole of the external power supply is electrically connected with the negative pole of the external power supply through the series connection of the second normally open switch KA2 of the intermediate relay 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 switch 4.

[0029] From Figure 4 It can be seen that the fuel return oil adjustment mechanism is,

[0030] When the real-time liquid level value of the fuel return oil is equal to the highest liquid level value, the real-time opening degree of the electric valve 6 is adjusted to the maximum; when the real-time liquid level value of the fuel return oil is equal to the lowest liquid level value, the electric valve 6 is closed; when the real-time liquid level value of the fuel return oil is greater than the lowest liquid level value and less than the highest liquid level value, the real-time opening degree of the electric valve 6 is adjusted according to the real-time liquid level value of the fuel return oil.

[0031] The method for adjusting the real-time opening degree of the electric valve 6 according to the real-time liquid level value of the fuel return oil is,

[0032] A liquid level period is set, the real-time liquid level value in the liquid level period is obtained, and the real-time liquid level value in the liquid level period is compared with the real-time liquid level value in the previous liquid level period. When the real-time liquid level value in the liquid level period is consistent with the real-time liquid level value in the previous liquid level period, the real-time opening degree of the electric valve 6 is not adjusted.

[0033] When the real-time liquid level value in the liquid level period is not consistent with the real-time liquid level value in the previous liquid level period, the real-time liquid level value in the liquid level period is subtracted from the real-time liquid level value in the previous liquid level period to obtain a liquid level difference value, and the real-time power of the electric valve 6 and the real-time opening degree of the valve 8 are adjusted according to the liquid level difference value and through a PID controller.

[0034] The method for adjusting the real-time opening degree of the electric valve 6 is to input the liquid level difference value into the PID controller to obtain an output opening degree, and to map the output opening degree to the real-time opening degree.

[0035] The expression for inputting the liquid level difference value into the PID controller to obtain the output opening degree is,

[0036] ;

[0037] wherein c is the liquid level difference value, K p is a proportional coefficient, K i is an integral coefficient, K d is a differential coefficient, O is the output opening, is the differential value of the liquid level difference, is the integral value of the liquid level difference.

[0038] The above only describes the preferred embodiments of the present application, and it should be noted that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which will not affect the effect of the implementation of the present application and the practicality of the patent.

Claims

1. A novel intelligent control system for fuel leakage, characterized in that, The system comprises a switch checking circuit and a liquid level sensor (7) installed in the oil return tank (2), the state of the high switch (4) and the state of the low switch (5) in the switch checking circuit are acquired to obtain the highest liquid level value and the lowest liquid level value; The real-time liquid level value of the fuel return oil is acquired by the liquid level sensor (7), and the real-time liquid level value of the fuel return oil is compared with the highest liquid level value and the lowest liquid level value respectively to trigger the fuel return oil adjusting mechanism to adjust the real-time opening degree of the electric valve (6); The fuel return oil adjusting mechanism is, When the real-time liquid level value of the fuel return oil is equal to the highest liquid level value, the real-time opening degree of the electric valve (6) is adjusted to the maximum; when the real-time liquid level value of the fuel return oil is equal to the lowest liquid level value, the electric valve (6) is closed; when the real-time liquid level value of the fuel return oil is greater than the lowest liquid level value and less than the highest liquid level value, the real-time opening degree of the electric valve (6) is adjusted according to the real-time liquid level value of the fuel return oil; The method for adjusting the real-time opening degree of the electric valve (6) according to the real-time liquid level value of the fuel return oil is, A liquid level period is set, the real-time liquid level value in the liquid level period is acquired, and the real-time liquid level value in the liquid level period is compared with the real-time liquid level value in the previous liquid level period; when the real-time liquid level value in the liquid level period is consistent with the real-time liquid level value in the previous liquid level period, the real-time opening degree of the electric valve (6) is not adjusted; When the real-time liquid level value in the liquid level period is inconsistent with the real-time liquid level value in the previous liquid level period, the real-time liquid level value in the liquid level period is subtracted from the real-time liquid level value in the previous liquid level period to obtain a liquid level difference value, and the real-time power of the electric valve (6) and the real-time opening degree of the valve (8) are adjusted according to the liquid level difference value and through a PID controller; The method for adjusting the real-time opening degree of the electric valve (6) is that the liquid level difference value is input into the PID controller to obtain an output opening degree, and the output opening degree is mapped into the real-time opening degree; The expression for inputting the liquid level difference value into the PID controller to obtain the output opening degree is, ； where c is the liquid level difference value, K p is a proportional coefficient, K i is an integral coefficient, K d is a differential coefficient, O is the output opening, is the differential value of the liquid level difference, is the integral value of the liquid level difference.

2. A novel intelligent fuel leakage control system as claimed in claim 1, wherein, The switch checking circuit comprises an intermediate relay, the positive pole of an external power supply is electrically connected with the negative pole of the external power supply through the series connection of a high switch (4), a low switch (5) and a coil (KA) of the intermediate relay; the positive pole of the external power supply is electrically connected with the negative pole of the external power supply through the series connection of a second normally open switch (KA2) of the intermediate relay and a motor (G) of the electric valve; a first normally open switch (KA1) of the intermediate relay is connected in parallel with the high switch (4).

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