Methods to prevent oil splashing

Abstract

The present invention provides a method for preventing oil splashing, which relates to the field of vehicle refueling technology, including: S1) determining whether an oil pump at a gas station has an oil pump abnormality based on a real-time oil flow rate Qgi; S2) after determining that no oil pump abnormality has occurred, judging whether a vehicle refueling pipe has a blockage abnormality based on the real-time system vacuum Pi, the real-time oil flow rate Qgi, and the real-time oil and gas flow rate Qvi; S3) after determining that a blockage abnormality has occurred, executing a corresponding operation. This method for preventing oil splashing facilitates staff to promptly understand whether a vehicle refueling pipe is blocked during the vehicle refueling process and to respond promptly, thereby clearing the blockage and preventing oil splashing when the refueling gun is pulled out after the vehicle is refueled. This solves the current problem of oil blocking the refueling pipe and the fuel tank assembly return air pipe during high-flow refueling due to defects in some vehicle refueling lines during refueling, thereby causing oil splashing when the refueling gun is pulled out.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle refueling, and in particular to a method for preventing oil from splashing. Background Art

[0002] When refueling a vehicle at a gas station, the fuel nozzle is first removed from the pump. A sensor within the pump detects the nozzle's removal and activates the internal fuel pump, pressurizing the fuel line. The nozzle is then inserted into the vehicle's fuel tank and turned on to begin refueling. During refueling, the station's vapor recovery system uses vacuum extraction to recover vapors generated within the vehicle's fuel tank and return them to underground tanks, reducing the release of vapors into the atmosphere. Under normal circumstances, oil and gas will be continuously recovered during the refueling process. However, in actual use, it was found that due to design defects in the refueling lines of some models, such as the existence of U-shaped bends inside, thin diameter of the refueling pipe, and blockage of the exhaust line of the fuel tank assembly after a period of use, in order to improve operational efficiency, the gas station sets the refueling flow rate to a higher level during the refueling process. In the middle and late stages of refueling, due to the excessive oil flow rate of the refueling gun, the refueling line will be completely blocked, thereby forming a liquid seal inside the car's oil inlet line, sealing the gas inside the fuel tank or oil inlet line, and as the refueling process proceeds, the internal gas pressure gradually increases, and eventually the liquid overflows into the entire refueling line, thereby triggering the refueling gun's full self-sealing mechanism to jump the gun in advance. At this time, if the refueling gun is pulled out directly, it is very likely that the oil near the refueling port will be sprayed out under the action of the gas pressure inside the fuel tank, spraying onto the refueler or the nearby ground, causing a more serious safety hazard.

[0003] Therefore, a method is urgently needed to solve at least one of the above problems. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a method for preventing oil splashing to solve the problem in the existing technology that during the refueling process of a vehicle, due to defects in the refueling lines of some vehicles, when refueling at a high flow rate, the oil clogs the vehicle refueling line and the return air line of the fuel tank assembly, thereby causing oil splashing when the refueling gun is pulled out.

[0005] In order to achieve the above object, the present invention provides a method for preventing oil splashing, which is applied to a gas station, and the method comprises:

[0006] S1) According to the real-time oil flow rate Q i Determine whether the oil pump at the oil station has any abnormality;

[0007] S2) After confirming that there is no oil pump abnormality, according to the real-time system vacuum Pi, real-time oil flow rate Qi and the real-time oil and gas flow rate Qvi of the oil and gas recovery pipeline to determine whether the vehicle's fuel pipe is blocked abnormally;

[0008] S3) After determining that a blocking abnormality has occurred, executing a corresponding operation.

[0009] Specifically, in step S1), according to the real-time oil flow rate Q i Determine whether the fuel pump at the fuel station has any abnormality, including:

[0010] Calculate the oil flow rate difference Qgx between the real-time oil flow rate Qgi and the initial oil flow rate Qg0, and determine the magnitude of the absolute value of the oil flow rate difference Qgx and the preset oil flow rate Qg;

[0011] If |Qgx|<Qg, it is determined that the oil pump of the oil station has no oil pump abnormality.

[0012] Specifically, in step S2), after determining that no oil pump abnormality occurs, the system vacuum Pi and the oil flow rate are Q i and real-time oil and gas flow rate Qvi to determine whether a blockage abnormality occurs, including:

[0013] Calculate the difference Px between the real-time system vacuum Pi and the initial system vacuum P0, calculate the difference Ex between the initial gas-liquid ratio E0 and the real-time gas-liquid ratio E, and calculate the oil and gas flow rate ratio Qvy between the real-time oil and gas flow rate Qvi and the initial oil and gas flow rate Qv0;

[0014] If any of the following conditions are met, it is determined that the vehicle's fuel pipe is blocked:

[0015] Px>P; Ex>E1; Qvy≥B; wherein, P is the preset vacuum threshold, E1 is the preset gas-liquid ratio threshold, and B is the preset oil-gas flow rate ratio threshold.

[0016] Specifically, in step S3), it is determined that a blocking abnormality occurs, and corresponding operations are performed, including:

[0017] If a blockage abnormality is determined, the oil-gas concentration ratio Cx of the real-time oil-gas concentration Ci and the initial oil-gas concentration C0 is calculated, and the size of the oil-gas concentration ratio Cx and the preset concentration ratio C is determined:

[0018] If Cx<C, the real-time oil flow rate Qgi is reduced to the safe oil flow rate Qg00, where Qg00 <Qg0。

[0019] Specifically, in step S3), it is determined that a blocking abnormality occurs and corresponding operations are performed, which also includes:

[0020] If Cx<C, the real-time oil flow rate Qgi is reduced to the safe oil flow rate Qg00, and the steps of calculating the oil-gas concentration ratio Cx and determining the size of the oil-gas concentration ratio Cx and the preset concentration ratio C are repeated;

[0021] If Cx<C reaches the preset number of times, refueling will be stopped immediately, and the oil in the fuel tank will be pumped back to a safe liquid level and the oil and gas in the fuel tank will be pumped back to a safe amount of oil and gas.

[0022] Specifically, the method for preventing oil splashing further includes:

[0023] The oil in the vehicle's refueling pipe is pumped back to a safe level through the oil return pump installed in the refueling system of the gas station.

[0024] Specifically, the method for preventing oil splashing further includes:

[0025] The vacuum pump of the oil and gas recovery system of the gas station is used to draw back the oil and gas in the return air pipeline of the vehicle tank assembly to a safe amount.

[0026] Specifically, after determining that a blockage anomaly occurs, further determining whether the fueling gun is self-sealing;

[0027] If it is determined that the fuel gun is self-sealing, stop refueling immediately and pump back the oil in the fuel tank to a safe liquid level and pump back the oil and gas in the fuel tank to a safe amount of oil and gas.

[0028] Specifically, the method for preventing oil splashing further includes:

[0029] When abnormal blockage is confirmed, an alarm will be issued through the early warning device at the gas station.

[0030] Specifically, the preset oil flow rate Qg is 50% of the initial oil flow rate Qg0.

[0031] Specifically, the initial system vacuum degree P0 and the real-time system vacuum degree Pi are obtained through a vacuum meter;

[0032] Obtain the initial oil flow rate Qg0 and the real-time oil flow rate Qgi through a refueling flow rate meter;

[0033] Obtain the initial oil and gas flow rate Qv0 and the real-time oil and gas flow rate Qvi through a gas flow meter;

[0034] The initial oil and gas concentration C0 and the real-time oil and gas concentration Ci are obtained through a concentration detector.

[0035] Specifically, the gas flow meter is a Roots or thermal flow sensor, and the concentration detector is an infrared oil and gas concentration meter.

[0036] Specifically, the method for preventing oil splashing further includes: while executing step S2),

[0037] S21) collecting the real-time system vacuum Pi, the real-time oil flow rate Qgi, the real-time oil and gas flow rate Qvi, and the real-time oil and gas concentration Ci at multiple predetermined time points;

[0038] S22) calculating the average system vacuum degree Pe, the average oil flow rate Qge, the average oil and gas flow rate Qve, and the average oil and gas concentration Ce at a plurality of predetermined time points;

[0039] S23) Determine whether a vehicle fuel pipe obstruction occurs based on the real-time system vacuum Pi, the real-time oil flow rate Qgi, the real-time oil and gas flow rate Qvi, and the real-time oil and gas concentration Ci at multiple predetermined time points, and the average system vacuum Pe, the average oil flow rate Qge, the average oil and gas flow rate Qve, and the average oil and gas concentration Ce at multiple predetermined time points.

[0040] Specifically, in step S23), determining whether the vehicle fuel pipe is abnormally clogged based on the real-time system vacuum Pi, the real-time oil flow rate Qgi, the real-time oil and gas flow rate Qvi, and the real-time oil and gas concentration Ci at multiple predetermined time points, and the average system vacuum Pe, the average oil flow rate Qge, the average oil and gas flow rate Qve, and the average oil and gas concentration Ce at multiple predetermined time points includes:

[0041] Calculate the vacuum deviation Pσ between the real-time system vacuum Pi and the system vacuum average value Pe at each predetermined time point;

[0042] If the vacuum deviation Pσ at multiple consecutive predetermined time points is positive, it is determined that the vehicle fuel pipe is blocked abnormally.

[0043] Specifically, in step S23), determining whether the vehicle fuel pipe is abnormally clogged based on the real-time system vacuum Pi, the real-time oil flow rate Qgi, the real-time oil and gas flow rate Qvi, and the real-time oil and gas concentration Ci at multiple predetermined time points, and the average system vacuum Pe, the average oil flow rate Qge, the average oil and gas flow rate Qve, and the average oil and gas concentration Ce at multiple predetermined time points includes:

[0044] Calculate the oil and gas flow rate deviation Qvσ between the real-time oil and gas flow rate Qvi and the average oil and gas flow rate Qve at each predetermined time point;

[0045] If the fuel gas flow rate deviation Qvσ at a plurality of consecutive predetermined time points is negative, it is determined that the vehicle fuel pipe is blocked abnormally.

[0046] Specifically, in step S23), determining whether the vehicle fuel pipe is abnormally clogged based on the real-time system vacuum Pi, the real-time oil flow rate Qgi, the real-time oil and gas flow rate Qvi, and the real-time oil and gas concentration Ci at multiple predetermined time points, and the average system vacuum Pe, the average oil flow rate Qge, the average oil and gas flow rate Qve, and the average oil and gas concentration Ce at multiple predetermined time points includes:

[0047] Calculate the oil and gas concentration deviation Cσ between the real-time oil and gas concentration Ci at each predetermined time point and the average oil and gas concentration Ce;

[0048] If the oil and gas concentration deviation Cσ at multiple consecutive predetermined time points is negative, it is determined that the vehicle fuel pipe is blocked abnormally.

[0049] The method for preventing oil splashing provided by the present invention can detect the real-time system vacuum Pi and real-time oil flow rate in real time. Q i and real-time oil and gas flow rate Qvi, and according to the real-time system vacuum Pi, real-time oil flow rate Q i and the real-time oil and gas flow rate Qvi are used to determine whether the vehicle refueling pipe is abnormally blocked. The above parameters are easy to measure, and it is convenient for the staff to judge the patency of the vehicle refueling pipeline in real time during the refueling of the vehicle tank based on the above parameters. In this way, based on the above parameters, it is known that the vehicle refueling pipe is blocked, and the staff can respond in time to clear the blockage, thereby avoiding oil splashing when the refueling gun is pulled out after the vehicle is refueled. This solves the problem in the prior art that during the refueling process of the vehicle, due to defects in the refueling pipeline of some vehicles, the vehicle refueling pipeline and the fuel tank assembly return air pipeline are blocked by oil when refueling at a high flow rate, thereby causing oil splashing when the refueling gun is pulled out, thereby ensuring refueling safety.

[0050] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the embodiments of the present invention, but do not constitute a limitation of the embodiments of the present invention. In the accompanying drawings:

[0052] Figure 1 This is a flow chart of a method for preventing oil splashing provided by one embodiment of the present invention;

[0053] Figure 2 This is a flow chart of sub-steps of step S1) in the method for preventing oil splashing provided by one embodiment of the present invention;

[0054] Figure 3This is a flow chart of sub-steps of step S2) in the method for preventing oil splashing provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0055] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0056] In the embodiments of the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used to describe the relative positional relationships of components in the directions shown in the drawings or in the vertical, perpendicular or gravity directions.

[0057] Figure 1 This is a flow chart of the method for preventing oil splashing. Figure 2 This is a sub-step flow chart of step S1) in the method for preventing oil splashing. Figure 3 This is a sub-step flow chart of step S2) in the method for preventing oil splashing.

[0058] like Figure 1 As shown, the present invention provides a method for preventing oil splashing, which is applied to a gas station, and the method comprises:

[0059] S1) According to the real-time oil flow rate Q i Determine whether the oil pump at the oil station has any abnormality;

[0060] S2) After confirming that there is no oil pump abnormality, according to the real-time system vacuum Pi, real-time oil flow rate Q i and the real-time oil and gas flow rate Qvi of the oil and gas recovery pipeline to determine whether the vehicle's fuel pipe is blocked abnormally;

[0061] S3) After determining that a blocking abnormality has occurred, executing a corresponding operation.

[0062] The method for preventing oil splashing provided by the present invention detects the real-time system vacuum Pi and the real-time oil flow rate in real time. Q i and the real-time oil and gas flow rate Qvi are used to determine whether the vehicle's fuel pipe is abnormally blocked, and corresponding operations are performed to avoid the blockage after the blockage is determined. The above parameters are convenient for detection, and the staff can judge the patency of the vehicle's fuel pipe in time according to the above parameters. In this way, when it is known that the vehicle's fuel pipe is blocked according to the above parameters, the staff can also respond in time to clear the blockage and avoid oil splashing after the vehicle is refueled. This solves the problem in the prior art that during the refueling process of the vehicle, due to defects in the fuel pipes of some vehicles, when refueling at a high flow rate, the oil blocks the fuel pipe and the return air pipe of the fuel tank assembly, thereby causing oil splashing when the fuel gun is pulled out, thereby ensuring refueling safety.

[0063] In one embodiment, Figure 2 As shown, in step S1), according to the real-time oil flow rate Q i Determine whether the fuel pump at the fuel station has any abnormality, including:

[0064] Calculate the oil flow rate difference Qgx between the real-time oil flow rate Qgi and the initial oil flow rate Qg0;

[0065] Determine the absolute value of the oil flow rate difference Qgx and the preset oil flow rate Qg;

[0066] If |Qgx|<Qg, it is determined that the oil pump of the oil station has no oil pump abnormality.

[0067] A gas station has a refueling system and an oil and gas recovery system. The refueling system includes multiple refueling machines, each of which is equipped with multiple refueling guns. The gas station refuels vehicles through the refueling machines and refueling guns. In the process of refueling vehicles with refueling guns, usually after the refueling gun has worked for a period of time, for example, after the refueling gun has worked for 5 seconds, the refueling amount tends to be stable, the speed or the opening of the regulating valve of the oil and gas recovery system of the gas station also tends to be stable, and the oil and gas recovery system is in a normal gas-liquid ratio state. The system vacuum degree of the refueling system of the gas station at this time is obtained as the initial system vacuum degree P0, and the initial oil flow rate Qg0 of the oil and the initial oil and gas flow rate Qv0 in the oil and gas recovery pipeline of the oil and gas recovery system of the gas station are obtained at the same time. Then, the real-time system vacuum degree Pi of the refueling system, the real-time oil flow rate Qgi of the oil and the real-time oil and gas flow rate Qvi of the oil and gas recovery pipeline are detected in real time, and Qgi-Qg0=Qgx is calculated. Qgx is the difference between the real-time oil flow rate Qgi and the initial oil flow rate Qg0. The absolute value of the oil flow rate difference Qgx is compared with the preset oil flow rate Qg. Usually, the preset oil flow rate Qg is between 5 and 20 L / min. If |Qgx| is less than Qg, it means that the oil flow rate fluctuation is small during the refueling process and the oil pump has not experienced any oil pump abnormality. However, oil pump abnormality will cause abnormalities in the oil flow rate, oil and gas flow rate, gas-liquid ratio, vacuum degree, etc. By judging the absolute value of the oil flow rate difference Qgx and the preset oil flow rate Qg, it can be ensured that the parameter fluctuations detected later are not related to the oil pump, and the possibility of large oil fluctuations caused by a single oil pump in the refueling system driving multiple refueling guns at the same time can be eliminated.

[0068] If |Qgx|≥Qg, the oil flow rate fluctuates greatly. At this time, the oil pump is abnormal. Stop refueling and check the cause of the oil pump abnormality. Usually, the oil pump abnormality is caused by oil pump blockage, oil pipe blockage, etc. Solve the problem that causes the oil pump abnormality.

[0069] After confirming that the fuel pump at the gas station is not abnormal, in order to further determine whether the vehicle's fuel pipe is blocked, such as Figure 3As shown, in step S2), after determining that no oil pump abnormality occurs, the system vacuum Pi and the real-time oil flow rate are used. Q i and real-time fuel and gas flow rate Qvi to determine whether the vehicle fuel pipe is blocked, including:

[0070] Calculate the vacuum difference Px between the real-time system vacuum Pi and the initial system vacuum P0, calculate the gas-liquid ratio difference Ex between the initial gas-liquid ratio E0 and the real-time gas-liquid ratio E, and calculate the oil and gas flow rate ratio Qvy between the real-time oil and gas flow rate Qvi and the initial oil and gas flow rate Qv0;

[0071] If any of the following conditions is met, the blockage abnormality is determined to be a level one blockage:

[0072] Px>P; Ex>E1; Qvy≥B; wherein, P is the preset vacuum threshold, E1 is the preset gas-liquid ratio threshold, and B is the preset oil-gas flow rate ratio threshold.

[0073] First, based on the absolute value of the oil flow rate difference Qgx and the preset oil flow rate Qg, eliminate the possibility of an oil pump abnormality in the oil station, ensure that the fluctuation of the parameters detected later is not related to the oil pump abnormality, calculate the vacuum difference Px between the real-time system vacuum Pi and the initial system vacuum P0, that is, Pi-P0=Px, and compare the sizes of Px and P, where P is the preset vacuum threshold, and the preset vacuum threshold P is between 3~20kPa.

[0074] Calculate the real-time gas-liquid ratio E, E = Qv0 / Qg0 - Qvi / Qgi, the gas-liquid ratio difference Ex = E0 - E, and compare the gas-liquid ratio difference Ex with E1. E1 is the preset gas-liquid ratio threshold, and the preset gas-liquid ratio threshold E1 is between 0.1 and 0.5.

[0075] Calculate the oil and gas flow rate ratio Qvy of the real-time oil and gas flow rate Qvi to the initial oil and gas flow rate Qv0, i.e., Qvi / Qv0=Qvy. Compare the oil and gas flow rate ratio Qvy with B, where B is the preset oil and gas flow rate ratio threshold. The preset oil and gas flow rate ratio threshold B is between 0 and 70%.

[0076] If any one of the following conditions, Px>P, Ex>E1, and Qvy≥B, is met, it can be determined that the vehicle fuel pipe is abnormally clogged, indicating that there is a risk of blockage in the vehicle fuel pipe. At this time, the probability of oil splashing when the fuel gun is pulled out is quite high. In the process of judging whether a blockage abnormality has occurred, in order to improve the accuracy of the judgment, the vacuum difference Px and the preset vacuum threshold P, the gas-liquid ratio difference Ex and the preset gas-liquid ratio threshold E1, or the oil-gas flow rate ratio Qvy and the preset oil-gas flow rate ratio threshold B can be randomly combined to compare to determine whether the vehicle fuel pipe is abnormally clogged, thereby improving the accuracy of the judgment.

[0077] After determining that the vehicle fuel pipe is abnormally clogged, in order to resolve the potential vehicle fuel pipe clog problem, in step S3), it is determined that the clog is abnormal and corresponding operations are performed, including:

[0078] If a blockage abnormality is determined, the oil-gas concentration ratio Cx of the real-time oil-gas concentration Ci and the initial oil-gas concentration C0 is calculated, and the size of the oil-gas concentration ratio Cx and the preset concentration ratio C is determined:

[0079] If Cx<C, the real-time oil flow rate Qgi is reduced to the safe oil flow rate Qg00, where Qg00 <Qg0。

[0080] When a vehicle's fuel pipe becomes abnormally clogged, calculate Ci / C0=Cx to further determine the oil-gas concentration ratio Cx relative to the preset concentration ratio C. If Cx<C, it indicates that the vehicle's fuel pipe is indeed at a high risk of clogging. In this case, the real-time oil flow rate Qgi sent into the fuel tank through the fuel gun in the refueling system should be immediately reduced, and the real-time oil flow rate Qgi should be reduced to the safe oil flow rate Qg00 to avoid further aggravation of the blockage.

[0081] In order to determine whether the blockage of the vehicle fuel pipe is alleviated after the real-time oil flow rate Qgi is reduced to the safe oil flow rate Qg00, in step S3), it is determined that a blockage abnormality occurs and corresponding operations are performed, which also includes:

[0082] If Cx<C, the real-time oil flow rate Qgi is reduced to the safe oil flow rate Qg00, and the steps of calculating the oil-gas concentration ratio Cx and determining the size of the oil-gas concentration ratio Cx and the preset concentration ratio C are repeated;

[0083] If Cx<C reaches the preset number of times, refueling will be stopped immediately, and the oil in the fuel tank will be pumped back to a safe liquid level and the oil and gas in the fuel tank will be pumped back to a safe amount of oil and gas.

[0084] After the real-time oil flow rate Qgi decreases, the oil-gas concentration ratio Cx is recalculated and the difference between Cx and C is determined. If Cx ≥ C, the blockage is considered resolved by reducing the real-time oil flow rate Qgi, and refueling can continue. If Cx < C within a preset number of times (the preset number can be set to three), the fuel nozzle immediately stops refueling. At this time, the oil return pump installed in the gas station's refueling system returns the oil in the vehicle's refueling pipe to a safe liquid level. The vacuum pump in the gas station's oil and gas recovery system returns the oil and gas in the vehicle's fuel tank assembly return line to a safe oil and gas level. In order to pump back the oil in the vehicle's fuel pipe to a safe level, a new pump back is added to each fuel dispenser at the gas station. It is calculated that Cx < C three times. After the fuel gun stops refueling, the pump back in the fuel dispenser at the gas station is immediately started to pump back the oil in the vehicle's fuel pipe until the outlet flow of the pump back is 0. At this time, the oil is pumped below the fuel gun nozzle, that is, it has reached the return air pipeline below the vehicle's fuel tank assembly to a safe level. Then, the vacuum pump of the gas station recovery system is turned on to start pumping at the maximum flow rate. At this time, the initial vacuum degree of the pump back is P30. Continuous use of the vacuum pump to pump air will accelerate the gas in the return air pipeline of the vehicle's fuel tank assembly. On the one hand, it will discharge, and on the other hand, it will accelerate the volatilization of excess oil in the vehicle's fuel pipe. These two aspects will accelerate the decrease in oil level until the system detects that the initial vacuum degree of the backflow is reduced from P30 to the vacuum safety threshold value Ps. The vacuum safety threshold value Ps is between 0-10kPa. At this time, the oil has completely entered the fuel tank, indicating that the blockage abnormality has been resolved. You can try to use a small flow rate for refueling. Since the position of the pipe mouth of the automobile fuel tank assembly return air pipeline is higher than the insertion depth of the fuel gun barrel, the vacuum pump can be used to extract the oil and gas in the fuel tank assembly return air pipeline, thereby promoting the oil blocked in the automobile fuel pipe to flow into the automobile fuel tank.

[0085] In addition, for certain specific vehicles, the license plate number can be recorded before entering the gas station, and the refueling flow rate can be gradually increased. The present method can be used to determine whether there is a blockage abnormality and increase the refueling flow rate until the maximum refueling flow rate specified by the national standard is reached. If a blockage occurs at a certain flow rate Qgmax, the maximum safe refueling flow rate of the vehicle can be recorded as Qgmax, and the vehicle can be refueled at the maximum safe refueling flow rate the next time it is refueled.

[0086] After determining that the vehicle's fueling pipe is abnormally clogged, there is a lot of oil and gas in the vehicle's fuel tank assembly return air pipeline, and the liquid level in the vehicle's fueling pipe has exceeded the pipe mouth of the fuel tank assembly return air pipeline to form a liquid seal, resulting in the gas in the vehicle's fuel tank assembly return air pipeline cannot be discharged normally. Through the specially installed return oil pump in the gas station's gas station, the oil blocked near the nozzle of the fuel gun in the vehicle's fueling pipe can be first extracted. When the flow rate of the return oil pump is close to 0, it means that the oil has been pumped to the bottom of the fuel gun barrel, and the level of the clogged oil in the fueling pipe has dropped below the pipe mouth of the vehicle's fuel tank assembly return air connecting pipe. In order to further accelerate the oil to drop to a safe liquid level in the vehicle's fuel tank assembly return air pipeline, start the vacuum pump in the oil and gas recovery system of the gas station. The vacuum pump Use the maximum speed to extract the oil and gas from the muzzle of the fuel gun, so that the gas in the return air pipeline of the vehicle tank assembly is discharged through the return air connecting pipe, which is conducive to the lowering of the oil level. In this way, even if there is a blockage in the return air pipeline of the tank assembly, the discharge of high-pressure gas in the tank can be accelerated by vacuum extraction by the vacuum pump. In order to ensure that the oil in the vehicle fuel pipe drops to a safe liquid level and the oil and gas in the return air pipeline of the vehicle tank assembly drop to a safe amount of oil and gas, in the process of returning oil and gas and oil, the real-time system vacuum Pi of the refueling system is detected in real time, and the changes in the real-time system vacuum Pi are observed. If the real-time system vacuum Pi becomes smaller, it means that the oil has dropped to the inside of the vehicle tank and the oil has reached the safe liquid level. At this time, the vacuum pump can stop extracting air. The method for preventing oil splashing provided by the present invention avoids the occurrence of oil splashing, and solves the problem in the existing technology that during the refueling process of a vehicle, due to defects in the refueling lines of some vehicles, the vehicle refueling line and the fuel tank assembly return air line are blocked by oil when refueling at a high flow rate, thereby causing oil splashing when the refueling gun is pulled out, thereby ensuring refueling safety.

[0087] In another way, for ease of operation, the vacuum pump can be run for a longer period of time to ensure that the vacuum pump can pump air into the oil and gas in the return air pipeline of the vehicle's fuel tank assembly to a safe amount of oil and gas, and the oil in the vehicle's refueling pipe to a safe liquid level. Afterwards, use a smaller flow rate to refuel the vehicle's fuel tank through the refueling gun until it is full.

[0088] After confirming that a blockage anomaly has occurred, further determine whether the fuel nozzle has self-sealed;

[0089] If it is determined that the fuel gun is self-sealing, stop refueling immediately and pump back the oil in the fuel tank to a safe liquid level and pump back the oil and gas in the fuel tank to a safe amount of oil and gas.

[0090] Usually, when refueling a vehicle, the working status of the fuel gun should be observed in time. When the fuel gun gives a self-sealing prompt, refueling should be stopped immediately. At this time, it can be completely determined that blockage has occurred in the vehicle's fuel pipe. In order to avoid oil splashing when the fuel gun is pulled out, the oil in the vehicle's fuel pipe should be immediately pumped back to a safe liquid level, and the oil and gas generated by refueling in the vehicle's fuel tank assembly return air pipeline should be pumped back to a safe amount of oil and gas, thereby solving the blockage caused by liquid seal in the fuel pipe and eliminating safety hazards.

[0091] In one embodiment, the method for preventing oil splashing further includes: upon determining that the blockage anomaly is a blockage anomaly, issuing an alarm via an alarm device at the gas station. The alarm device is provided on the gas station's refueling system. Upon determining that a blockage anomaly exists in a vehicle's refueling pipe, the alarm device issues an alarm, alerting personnel to the risk of oil splashing during refueling. The alarm device then promptly adjusts the oil flow rate and monitors changes in other parameters during refueling to prevent oil splashing when the fuel nozzle is removed.

[0092] Specifically, the preset oil flow rate Qg is 50% of the initial oil flow rate Qg0.

[0093] In order to obtain the system vacuum degree, oil flow rate, oil and gas flow rate and oil and gas concentration, the initial system vacuum degree P0 and the real-time system vacuum degree Pi are obtained through a vacuum meter;

[0094] Obtain the initial oil flow rate Qg0 and the real-time oil flow rate Qgi through a refueling flow rate meter;

[0095] Obtain the initial oil and gas flow rate Qv0 and the real-time oil and gas flow rate Qvi through a gas flow meter;

[0096] The initial oil and gas concentration C0 and the real-time oil and gas concentration Ci are obtained through a concentration detector.

[0097] In actual use, the refueling system primarily consists of a refueling nozzle with a squeeze-type gas hood and oil and vapor recovery function, a coaxial oil and vapor recovery hose, a gas-to-liquid ratio adjustment device, an oil and vapor recovery vacuum pump, a concentration detector, a pressure gauge, a gas flow meter, a refueling dispenser, a supporting refueling flow rate control system, and a controller. The gas flow meter is a Roots or thermal flow sensor, and the concentration detector is an infrared oil and vapor concentration meter. When the refueling nozzle is opened for refueling, the oil and vapor recovery vacuum pump of the gas station's oil and vapor recovery system operates simultaneously. Five seconds after refueling, the corresponding parameters are recorded using the vacuum gauge, refueling flow rate meter, gas flow meter, and concentration detector, allowing staff to understand the refueling status based on real-time monitoring parameters.

[0098] In order to achieve early warning so that the staff can take timely precautions against possible oil splashing, the method for preventing oil splashing further includes: while executing step S2),

[0099] Collect the real-time system vacuum Pi, real-time oil flow rate Qgi, real-time oil and gas flow rate Qvi and real-time oil and gas concentration Ci of the oil and gas recovery pipeline at multiple predetermined time points;

[0100] Calculate the average system vacuum degree Pe, the average oil flow rate Qge, the average oil and gas flow rate Qve and the average oil and gas concentration Ce of the oil and gas recovery pipeline at multiple predetermined time points;

[0101] Based on the real-time system vacuum Pi, real-time oil flow rate Qgi, real-time oil and gas flow rate Qvi and real-time oil and gas concentration Ci at multiple predetermined time points, as well as the average system vacuum Pe, average oil flow rate Qge, average oil and gas flow rate Qve and average oil and gas concentration Ce at multiple predetermined time points, determine whether the vehicle refueling pipe is abnormally blocked.

[0102] Calculating the vacuum deviation Pσ between the real-time system vacuum Pi and the system vacuum average Pe at each predetermined time point; if the vacuum deviation Pσ at multiple consecutive predetermined time points is positive, determining that the vehicle fuel pipe is blocked abnormally; and / or

[0103] Calculating the oil and gas flow rate deviation Qvσ between the real-time oil and gas flow rate Qvi at each predetermined time point and the average oil and gas flow rate Qve; if the oil and gas flow rate deviation Qvσ at multiple consecutive predetermined time points is negative, determining that the vehicle fuel pipe is blocked abnormally; and / or

[0104] Calculate the oil and gas concentration deviation Cσ between the real-time oil and gas concentration Ci at each predetermined time point and the oil and gas concentration average Ce; if the oil and gas concentration deviation Cσ at multiple consecutive predetermined time points is negative, it is determined that the vehicle fuel pipe is blocked abnormally.

[0105] In one embodiment, for example, N predetermined time points are set. Option 1: calculate the average system vacuum Pe at the N predetermined time points, and then calculate the vacuum deviation Pσ between the real-time system vacuum Pi and the system vacuum average Pe at each predetermined time point, that is, Pσ=Pi-Pe. If Pσ is a positive value at these N consecutive predetermined time points, it means that the vacuum of the refueling system shows a continuous upward trend, and it is determined that there is a blockage abnormality in the vehicle refueling pipe; Option 2: calculate the average oil and gas flow rate Qve at the N predetermined time points, and calculate the oil and gas flow rate deviation Qvσ between the real-time oil and gas flow rate Qvi at each predetermined time point and the oil and gas flow average Qve, Qvσ=Qvi-Qv e. If the oil and gas flow rate deviation Qvσ is a negative value within N consecutive predetermined time points, that is, the oil and gas flow rate shows a continuous downward trend, it is determined that the vehicle refueling pipe is blocked abnormally; Option three: Calculate the average oil and gas concentration Ce at N predetermined time points, and calculate the oil and gas concentration deviation Cσ between the real-time oil and gas concentration Ci at each predetermined time point and the oil and gas concentration average value Ce, Cσ=Ci-Ce. If the oil and gas concentration deviation Cσ is a negative value within N consecutive predetermined time points, that is, the oil and gas concentration shows a continuous downward trend, it is determined that the vehicle refueling pipe is blocked; Usually, in order to improve the accuracy of judgment, Option one, Option two and Option three can be used in combination to improve the accuracy of judgment on oil splashing.

[0106] The method for preventing oil splashing provided by the present invention can detect the real-time system vacuum Pi and real-time oil flow rate in real time. Q i and real-time oil and gas flow rate Qvi, and according to the real-time system vacuum Pi, real-time oil flow rate Q i and the real-time oil and gas flow rate Qvi are used to determine whether the vehicle's refueling pipe is abnormally blocked and the degree of the blockage. The above parameters are easy to measure, and it is convenient for the staff to judge in real time the patency of the vehicle's refueling pipeline during the refueling of the vehicle's fuel tank based on the above parameters. In this way, even if the vehicle's refueling pipe is known to be blocked based on the above parameters, the staff can respond in time to clear the blockage, and avoid oil splashing when the refueling gun is pulled out after the vehicle is refueled. This solves the problem in the prior art that during the refueling process of the vehicle, defects in some vehicle refueling pipelines cause oil and gas to block the refueling pipeline and the fuel tank exhaust pipeline, thereby causing oil splashing when the refueling gun is pulled out, thereby ensuring refueling safety.

[0107] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

[0108] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0109] Those skilled in the art will appreciate that all or part of the steps in the methods described in the aforementioned embodiments can be performed by instructing the relevant hardware through a program. The program, stored in a storage medium, includes instructions for causing a microcontroller, chip, or processor to execute all or part of the steps in the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0110] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed in the embodiments of the present invention.

Claims

1. A method for preventing oil splashing, applied to a gas station, characterized in that: The method comprises: S1) According to the real-time oil flow rate Q g i. Determining whether an oil pump of the oil station has an oil pump abnormality, including: calculating an oil flow rate difference Qgx between a real-time oil flow rate Qgi and an initial oil flow rate Qg0; Determine the absolute value of the oil flow rate difference Qgx and the preset oil flow rate Qg; If |Qgx|<Qg, it is determined that the oil pump of the oil station has no oil pump abnormality; S2) After confirming that there is no oil pump abnormality, according to the real-time system vacuum Pi, real-time oil flow rate Q g i and the real-time oil and gas flow rate Qvi of the oil and gas recovery pipeline to determine whether the vehicle fuel pipe is abnormally blocked, including: calculating the vacuum difference Px between the real-time system vacuum Pi and the initial system vacuum P0, calculating the gas-liquid ratio difference Ex between the initial gas-liquid ratio E0 and the real-time gas-liquid ratio E, and calculating the oil and gas flow rate ratio Qvy between the real-time oil and gas flow rate Qvi and the initial oil and gas flow rate Qv0; If any of the following conditions are met, it is determined that the vehicle's fuel pipe is blocked: Px>P; Ex>E1; Qvy≥B; where P is the preset vacuum threshold, E1 is the preset gas-liquid ratio threshold, and B is the preset oil-gas flow rate ratio threshold; S3) After determining that a blockage anomaly has occurred, executing corresponding operations, including: if a blockage anomaly has occurred, calculating the oil-gas concentration ratio Cx of the real-time oil-gas concentration Ci to the initial oil-gas concentration C0, and determining the difference between the oil-gas concentration ratio Cx and the preset concentration ratio C: If Cx<C, the real-time oil flow rate Qgi is reduced to the safe oil flow rate Qg00, where Qg00<Qg0; If Cx<C, the real-time oil flow rate Qgi is reduced to the safe oil flow rate Qg00, and the steps of calculating the oil-gas concentration ratio Cx and determining the size of the oil-gas concentration ratio Cx and the preset concentration ratio C are repeated; If Cx<C reaches the preset number of times, refueling will be stopped immediately, and the oil in the fuel tank will be pumped back to a safe liquid level and the oil and gas in the fuel tank will be pumped back to a safe amount of oil and gas.

2. The method for preventing oil splashing according to claim 1, characterized in that: The method for preventing oil splashing also includes: The oil in the vehicle's refueling pipe is pumped back to a safe level through the oil return pump installed in the refueling system of the gas station.

3. The method for preventing oil splashing according to claim 1, characterized in that: The method for preventing oil splashing also includes: The vacuum pump of the oil and gas recovery system of the gas station is used to draw back the oil and gas in the return air pipeline of the vehicle tank assembly to a safe amount.

4. The method for preventing oil splashing according to claim 1, characterized in that: The method for preventing oil splashing also includes: After confirming that a blockage anomaly has occurred, further determine whether the fuel nozzle has self-sealed; If it is determined that the fuel gun is self-sealing, stop refueling immediately and pump back the oil in the fuel tank to a safe liquid level and pump back the oil and gas in the fuel tank to a safe amount of oil and gas.

5. The method for preventing oil splashing according to claim 1, characterized in that: The method for preventing oil splashing also includes: When abnormal blockage is confirmed, an alarm will be issued through the early warning device at the gas station.

6. The method for preventing oil splashing according to claim 1, characterized in that: The preset oil flow rate Qg is 50% of the initial oil flow rate Qg0.

7. The method for preventing oil splashing according to claim 1, characterized in that: Obtain the initial system vacuum degree P0 and the real-time system vacuum degree Pi through a vacuum meter; Obtain the initial oil flow rate Qg0 and the real-time oil flow rate Qgi through a refueling flow rate meter; Obtain the initial oil and gas flow rate Qv0 and the real-time oil and gas flow rate Qvi through a gas flow meter; The initial oil and gas concentration C0 and the real-time oil and gas concentration Ci are obtained through a concentration detector.

8. The method for preventing oil splashing according to claim 7, characterized in that: The gas flow meter is a Roots or thermal flow sensor, and the concentration detector is an infrared oil and gas concentration meter.

9. The method for preventing oil splashing according to claim 1, characterized in that: The method for preventing oil splashing further includes: while executing step S2), S21) collecting the real-time system vacuum Pi, the real-time oil flow rate Qgi, the real-time oil and gas flow rate Qvi, and the real-time oil and gas concentration Ci at multiple predetermined time points; S22) calculating the average system vacuum degree Pe, the average oil flow rate Qge, the average oil and gas flow rate Qve, and the average oil and gas concentration Ce at a plurality of predetermined time points; S23) Determine whether a vehicle fuel pipe obstruction occurs based on the real-time system vacuum Pi, the real-time oil flow rate Qgi, the real-time oil and gas flow rate Qvi, and the real-time oil and gas concentration Ci at multiple predetermined time points, and the average system vacuum Pe, the average oil flow rate Qge, the average oil and gas flow rate Qve, and the average oil and gas concentration Ce at multiple predetermined time points.

10. The method for preventing oil splashing according to claim 9, characterized in that: In step S23), determining whether the vehicle fuel pipe is abnormally clogged based on the real-time system vacuum Pi, the real-time oil flow rate Qgi, the real-time oil and gas flow rate Qvi, and the real-time oil and gas concentration Ci at multiple predetermined time points, as well as the average system vacuum Pe, the average oil flow rate Qge, the average oil and gas flow rate Qve, and the average oil and gas concentration Ce at multiple predetermined time points includes: Calculate the vacuum deviation Pσ between the real-time system vacuum Pi and the system vacuum average value Pe at each predetermined time point; If the vacuum deviation Pσ at multiple consecutive predetermined time points is positive, it is determined that the vehicle fuel pipe is blocked abnormally.

11. The method for preventing oil splashing according to claim 9, characterized in that: In step S23), determining whether the vehicle fuel pipe is abnormally clogged based on the real-time system vacuum Pi, the real-time oil flow rate Qgi, the real-time oil and gas flow rate Qvi, and the real-time oil and gas concentration Ci at multiple predetermined time points, as well as the average system vacuum Pe, the average oil flow rate Qge, the average oil and gas flow rate Qve, and the average oil and gas concentration Ce at multiple predetermined time points includes: Calculate the oil and gas flow rate deviation Qvσ between the real-time oil and gas flow rate Qvi and the average oil and gas flow rate Qve at each predetermined time point; If the fuel gas flow rate deviation Qvσ at a plurality of consecutive predetermined time points is a negative value, it is determined that the vehicle fuel pipe is blocked abnormally.

12. The method for preventing oil splashing according to claim 9, characterized in that: In step S23), determining whether the vehicle fuel pipe is abnormally clogged based on the real-time system vacuum Pi, the real-time oil flow rate Qgi, the real-time oil and gas flow rate Qvi, and the real-time oil and gas concentration Ci at multiple predetermined time points, as well as the average system vacuum Pe, the average oil flow rate Qge, the average oil and gas flow rate Qve, and the average oil and gas concentration Ce at multiple predetermined time points includes: Calculate the oil and gas concentration deviation Cσ between the real-time oil and gas concentration Ci at each predetermined time point and the average oil and gas concentration Ce; If the oil and gas concentration deviation Cσ at multiple consecutive predetermined time points is negative, it is determined that the vehicle fuel pipe is blocked abnormally.

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