WO2015194795A1 - Apparatus for fuel dispenser to prevent fuel mixing - Google Patents

Abstract

The present invention relates to an apparatus for a fuel dispenser for preventing the mixing of fuel which measures the volatile organic compounds (VOC) gas concentration of a fuel tank of a vehicle using a VOC sensor, distinguishes between diesel and petrol, automatically shuts off a solenoid valve if the vehicle has a different type of fuel to the fuel dispenser, and can thereby prevent the mixing of fuels. The apparatus of the present invention comprises: a VOC sensor installed in a nozzle of a fuel dispenser for sensing volatile organic compounds in a fuel tank of a vehicle being fueled; a sensor power unit for supplying power to the VOC sensor; a signal detection unit for detecting a signal sensed by the VOC sensor; a fuel-mixture prevention control unit for supplying power to the VOC sensor using the sensor power unit when the nozzle of the fuel dispenser is un-hooked for fueling, for receiving a sensing signal of the non-volatile organic compounds inside the tank and calculating the detected non-volatile organic compound concentration using signal processing so as to distinguish the vehicle's type of fuel when the spout of the fuel dispenser nozzle is inserted into the fueling inlet of the fuel tank of the vehicle to be fueled, and for instructing a solenoid controller to shut off a solenoid valve if it is determined to be a mixed fuel; and a solenoid controller for shutting off a solenoid valve of a fueling pipe according to the control of the fuel-mixture prevention control unit.

Description

Oil mixing device of lubricator

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a technology for preventing blending of gasoline in a gasoline vehicle or gasoline in a gasoline vehicle. More particularly, the present invention relates to a vehicle fuel oil using a volatile organic compound (VOC) sensor. After measuring the VOC gas concentration of the tank and distinguishes between gasoline and gasoline, it is related to the oil mixture prevention device of the lubricator which can prevent the mixing by automatically shutting off the solenoid valve when it is different from the oil type of the lubricator.

In general, in the current tanker, the outer diameter of the gasoline nozzle is designed to be smaller than the outer diameter of the gasoline nozzle, so that the gasoline nozzle having a large outer diameter is not inserted into the small oil inlet formed in the gasoline fuel tank. In other words, domestic production vehicles are 22mm in fuel supply ports for gasoline vehicles, 19mm in gasoline gasoline nozzles, and 32-40mm in gasoline gasoline fuel nozzles, and 25mm in gasoline gasoline nozzles. The lubricator nozzle is smaller than the lubrication port of the diesel vehicle, so it is easy to cause an accident of oil mixing that erroneously petrols the fuel when the diesel vehicle is refueled. In particular, the increase in self-lubrication is increasing such a mixed accident.

Since such a blending accident occurs once, the recovery cost can be reduced from several million won to tens of millions of won. Therefore, techniques to prevent this have been proposed. However, the conventional blending prevention technology is based on the difference in diameter size, and thus the accuracy is high. There is a problem falling. In addition, as the number of imported vehicles increases, there are many vehicles with different diameters of oil inlets, so the diameter-based mixing prevention technology is not effective.

"Vehicle fuel mixing prevention device" registered in the Republic of Korea Patent Publication No. 10-1247447 is at least one of the fuel nozzle of the gas tank for oil filling gas, the magnetic pad of the magnetic pad attached to the oil inlet of the diesel passenger car It is to block the supply of gasoline by the change of physical properties detected by the magnetic sensing sensor, including the magnetic sensing sensor whose physical properties change under the influence, and "lubricator oil mixing prevention device" disclosed in Publication No. 10-2011-0131844 It is to prevent mixing by using sensor and contact sensor.

Prior art literature

(Patent Document 1) KR10-1247447 B1

(Patent Document 2) KR10-2011-0131844 A

(Patent Document 3) KR10-2011-0083401 A

Conventional anti-mixing devices based on the difference between the diameter of the lubricator nozzle and the lubrication port diameter of the vehicle fuel oil tank do not prevent the gasoline from being oiled in the diesel vehicle, and the diameter of the lubrication port is increased for each vehicle due to the increase of imported vehicles. Different, there is a problem of ineffectiveness. In addition, conventional blending prevention technology using a magnetic sensor is difficult to use the actual situation is poor accuracy.

The present invention has been proposed to solve the above problems, and an object of the present invention is to measure the VOC gas concentration of the vehicle fuel oil tank using a volatile organic compound (VOC) sensor, and then If differentiating and different oil type of lubricator, it is to provide a lubrication prevention device of the lubricator which can prevent the mixing by automatically blocking the solenoid valve.

In order to achieve the above object, the apparatus of the present invention, the VOC sensor for detecting the volatile organic compounds inside the fuel oil tank of the vehicle to be refueled installed in the lubricator nozzle; A sensor power supply unit for supplying power to the VOC sensor; A signal detector for detecting a signal sensed by the VOC sensor; Hooking off the lubricator nozzle for lubrication supplies power to the VOC sensor through the sensor power supply, and detects the non-volatile organic matter inside the tank when the spout of the lubricator nozzle is inserted into the feed port of the vehicle fuel tank to be refueled. A mixed oil prevention control unit which receives a signal and calculates a concentration of nonvolatile organic substances detected through signal processing to determine a fuel oil type of the vehicle, and instructs the solenoid controller to shut off the solenoid valve when the mixed oil is determined; And a solenoid controller for blocking the solenoid valve of the oil supply pipe under the control of the mixing control unit.

The mixing prevention apparatus further includes an alarm unit that generates an alarm sound according to a control signal when mixing is detected, and the mixing prevention control unit generates an alarm sound by controlling the alarm unit when it is determined that the mixture is mixed.

The VOC sensor has a semiconductor VOC sensor chip mounted in an inner space of a housing in which a hole is formed at one side, and a micro mesh network is attached to the hole to allow gas such as volatile organic gas to pass and block gas such as gasoline or liquid. When the power is applied to the semiconductor sensor chip to detect the VOC gas, the semiconductor VOC sensor chip reacts with the VOC gas and the gas detection unit causing a change in resistance, and by heating the detected VOC gas to an appropriate temperature It consists of a heater to increase the activation energy of the detection gas, the gas detector is a Pt catalyst is added to the SnO ₂ material.

The micro mesh network has a mesh diameter of 30 to 100 μm, and the hydrophobic surface is coated with PPFC on the mesh sheet to improve the waterproof ability of the mesh sheet.

According to the present invention, a VOC (volatile organic compound) measuring sensor is mounted on the spout at the tip of the lubricator nozzle, and after measuring the VOC gas concentration in the vehicle fuel oil tank, the gasoline and diesel oil types are discriminated to prevent mixing. Irrespective of diameter size, oil type can be accurately determined to prevent mixing. That is, gasoline has a significantly higher VOC generation rate than diesel, so it is possible to classify oil types by simple VOC concentration measurement. According to the present invention, the VOC concentration measurement is performed in a short time (within about 0.1 second), and when an oil accident occurs, At the same time, the solenoid valve can be locked quickly to stop the oil supply.

In addition, the mixing prevention apparatus according to the present invention can be miniaturized and can be mounted at the end of the nozzle, and since the principle of measuring the concentration of VOC gas inside the tank is not required to install an identification device in a vehicle, it can be implemented at low cost.

1 is a schematic diagram showing a lubricator to which the blend prevention apparatus of the present invention is applied;

Figure 2 is a schematic diagram showing an lubricator nozzle to which the present invention is applied,

3 is a block diagram showing the mixing control device of the lubricator according to the present invention,

4 is a flow chart showing an operation procedure of the oil mixture prevention device of the lubricator according to the present invention,

5 is a cutaway perspective view of the VOC sensor shown in FIG.

6 is a circuit diagram of the VOC sensor shown in FIG.

FIG. 7 illustrates an example of a micro mesh network of the VOC sensor illustrated in FIG. 3;

8A and 8B are conceptual views illustrating the VOC sensor shown in FIG. 3.

The technical problems achieved by the present invention and the practice of the present invention will be more clearly understood by the preferred embodiments of the present invention described below. The following examples are merely illustrated to illustrate the present invention and are not intended to limit the scope of the present invention.

1 is a schematic view showing a lubricator to which the blending prevention device of the present invention is applied, and FIG. 2 is a schematic view showing a lubricator nozzle to which the present invention is applied.

The lubricator to which the anti-mixing device of the present invention is applied includes a mixing control controller 130, a solenoid valve controller 140, a solenoid valve 142, and a lubricator pump 150, as shown in FIGS. 1 and 2. The lubricator main body 30 and the lubricator nozzle 110 connected to the lubricator main body 30 for lubricating the oil tank 20 of the vehicle are configured by the driver to pay the gas oil or gasoline stored in the gas station underground storage tank 20. The fuel oil tank 10 of the driver vehicle is lubricated by an amount corresponding to the amount of money.

1 and 2, in the lubricator nozzle 110 according to the present invention to measure the VOC concentration inside the oil tank 10 of the vehicle in the air inlet 114 for oil overflow prevention outside or inside the spout 112 The VOC sensor 120 is attached, and the VOC sensor 120 is connected to the anti-mixing controller 130 through a wire. Lubricator is equipped with a button and a display unit for selecting the oil type and payment amount when oiling, and divided into a gasoline nozzle for oiling gasoline and a gasoline oiling nozzle for oiling gas, each oiler nozzle (110) The hook of the main body 30 is in the 'hook on' state, and when the lubricator nozzle 110 is lifted for lubrication, the hook is configured to be 'hook off'.

In addition, when the VOC measuring sensor 120 is mounted on the lubricator nozzle 110 according to the present invention, it is possible to secure immediate responsiveness when it is attached to the outside of the nozzle. If the VOC sensor of the present invention is manufactured in a small size within 10 mm ² and mounted on a part connected to an oil intake prevention inlet, it is possible to secure high responsiveness and reliability since it is supplied by sucking air in the tank.

Since the lubricator is the same as a conventional lubricator except that the mixing prevention apparatus according to the present invention is installed, further description thereof will be omitted.

Figure 3 is a block diagram showing the mixing control device of the lubricator according to the present invention, Figure 4 is a flow chart illustrating an operation procedure of the mixing control device of the lubricator according to the present invention.

As shown in FIG. 3, the mixing control device of the lubricator includes a VOC sensor 120 installed in the lubricator nozzle 110 to detect volatile organic compounds (VOC) in an oil tank of a vehicle to be refueled. The sensor power supply unit 132 for supplying power to the VOC sensor 120, the signal detector 134 for detecting a signal detected from the VOC sensor 120, and when mixed oil is detected, generates an alarm sound according to a control signal. When the alarm unit 138 hooks off the lubricator nozzle 110 for fueling, it supplies power to the VOC sensor 120 through the sensor power supply 132 and the fuel tank 10 of the vehicle to which the spout 112 of the lubricator nozzle is to be refueled. When it is inserted into the oil inlet 12 of the fuel tank to detect the nonvolatile organic matter inside the fuel tank and receives the detection signal of the sensor through the signal detector 134 to calculate the concentration of the volatile organic matter detected through the signal processing Fuel price of the vehicle If it is determined whether the oil is oil or diesel, mixed alarm to control the alarm unit 138 to generate an alarm sound at the same time to prevent the solenoid valve 140 to block the solenoid valve 142, mixing prevention The solenoid controller 140 blocks the solenoid valve 142 of the oil supply pipe under the control of the controller 136.

The present invention is equipped with a VOC (volatile organic compound) measuring sensor 120 in the spout 112 of the end of the lubricator nozzle, by measuring the concentration of VOC gas in the vehicle fuel oil tank 10 to determine the gasoline and diesel oil type to be. Gasoline has a much higher VOC generation compared to diesel, so it is possible to classify oil types by simply measuring the concentration of VOC. According to the 2010 data of the National Institute of Environmental Science, diesel vehicle VOC emissions are 0.2543kg, and the gasoline vehicle's VOC emissions are 5.2792kg, about 20 times. The VOC generation of gasoline vehicles is high, so it is possible to classify oil types by simply measuring the concentration of VOC. According to the present invention, since the VOC concentration can be measured in a short time (within about 0.1 second), it is possible to quickly stop refueling in the event of mixed oil accident by determining the oil type.

To this end, the mixed oil prevention apparatus of the present invention, as shown in Figure 4, when the hook is lifted off the lubricator nozzle 110 to turn on the VOC sensor 120 to detect the VOC gas of the vehicle fuel oil tank 10 After calculating the concentration, determine the type of fuel oil of the vehicle, and if it is determined to be gasoline, determine the type of the corresponding gasoline nozzle, and if the gasoline nozzle is a gasoline nozzle for refueling gasoline, the gasoline nozzle is normally refueled to complete the oiling, and the gasoline nozzle 110 If it is not a gasoline nozzle, it is determined as mixed oil, and blocks the solenoid valve 142 through the solenoid controller 140, and generates a mixed oil alarm through the alarm unit 138 (S101 to S111).

On the other hand, if it is determined that the type of fuel oil of the vehicle is determined to be diesel, if the oil type of the lubricator nozzle 110 is determined, if the lubricator nozzle is a lubricator nozzle for lubricating the diesel oil, if the lubricator nozzle is lubricated normally to complete the lubrication, the lubricator nozzle is a diesel nozzle Otherwise, it is determined that the mixture is mixed with the solenoid valve 142 through the solenoid controller 140, and generates a mixed alarm through the alarm unit 138 (S112 ~ S115).

As described above, the present invention measures the VOC concentration of the fuel tank vehicle 10 in the VOC measuring sensor 120, and after determining the gasoline, diesel oil type by the concentration of VOC measured in the anti-mixing controller 130, the corresponding nozzle 110 If the oil type of) and the oil type of the refueling vehicle tank 10 are different (at the time of mixing accident), the solenoid valve 142 of the nozzle oil supply pipe is blocked to block the oil injection, and the mixing oil alarm is displayed.

FIG. 5 is a cutaway perspective view of the VOC sensor shown in FIG. 3, FIG. 6 is a circuit diagram of the VOC sensor shown in FIG. 3, and FIG. 7 is a diagram illustrating an example of a mesh of the VOC sensor shown in FIG. 3, and FIG. 8A and 8B are conceptual views illustrating the VOC sensor shown in FIG. 3.

As shown in FIG. 5, the VOC sensor 120 used in the mixing prevention apparatus according to the present invention includes a semiconductor VOC sensor chip 122 in an inner space including a bottom case 128 and an upper case 26 having holes formed therein. In this case, a micro mesh network 124 is installed in a hole of the upper case to pass a gas such as volatile organic gas and block a gas such as gasoline or a case. Is applied to detect the VOC gas. Such a VOC sensor structure is just one example, and various modifications are possible.

As shown in FIG. 6, the semiconductor sensor chip 122 according to the present invention heats the gas detection unit 122a that reacts with the VOC gas to change resistance, and heats the detected VOC gas to an appropriate temperature. The heater unit 122b for increasing the activation energy and the electrode unit for transmitting an electrical signal from the detection unit 122a to the outside. The VOC measuring sensor 120 is a semiconductor gas sensor using SnO ₂ , and can be miniaturized within 10 mm ² as a principle of measuring a resistance value of VOC gas changed by adsorption.

Semiconductor gas sensors generally use MOS semiconductors and are classified into P-MOS and N-MOS sensors according to their electrical conduction characteristics.They react to reducing gases and change their resistance according to the presence or absence of gas and Use the characteristics that make a difference. In the N-MOS semiconductor gas sensor, the sensor resistance decreases and the electrical conductivity increases according to the reducing gas. In the P-MOS semiconductor gas sensor, the sensor resistance increases and the electrical conductivity decreases.

For example, before Gas is adsorbed oxygen is adsorbed on the Sn0 ₂ sensor, as shown in Figure 8a, and can also be represented by the following chemical reaction formula shown in equation (1).

Equation 1

After gas adsorption (if gas is detected), the gas desorbs oxygen adsorbed on the sensor surface as shown in FIG. 8B and lowers the potential barrier inside the sensor. If this is expressed as a chemical reaction formula (2). The heating of the sensor (Heating) is necessary for rapid oxygen desorption, it is heated to about 250 ~ 300 ℃.

Equation 2

Gas concentration detected by the sensor is output as the resistance component of the sensor, the relationship between the electrical resistance and gas concentration can be represented by the following equation (3).

Equation 3

In Equation 3, Rs represents the electrical resistance of the sensor, A is a constant, C is a gas concentration, and a is a curve slope of resistance. The material of the VOC sensor semiconductor chip 122 is SnO ₂ , which is less sintered than other materials, thereby ensuring stable performance even at a high temperature for a long time.

In addition, if Pt is formed in the sensing unit 122a as a catalyst material, a high reaction rate can be ensured even at a relatively low temperature, and the reaction rate can be improved by increasing the contact area between the catalyst material and the gas.

According to the test example of the present invention, VOC sensor measurement results at a distance of 30 cm away from the fuel oil, the gasoline is measured at a concentration of 1,000 ppm or more, diesel is less than 100ppm it was confirmed that the type of gasoline and diesel can be determined by the VOC concentration.

And the VOC sensor 120 according to the present invention is a sensor for classifying gasoline and diesel oil species by measuring the VOC concentration, the size is small within 10mm ² , in order to prevent sensor malfunction due to oil shown in FIG. As it adopts the micro mesh network structure, gas passes through and oil stops. In addition, the micro mesh network makes holes through the gas less than a few tens of micrometers by the MEMS process, and the PPFC coating on the hydrophobic surface to improve the waterproofing ability. That is, since the micro waterproof mesh sheet according to the present invention has only micro holes having a size of several micrometers in the form of a flat plate array, the waterproof ability is determined by the diameter of the micro holes, so that the size of the micro holes may be very small to improve the waterproof ability. However, due to the limitation of the micromachining technology for the manufacture of micro holes with high aspect ratio and the rapid decrease in the aperture ratio, there is a problem that gas does not pass smoothly into the mesh. PPFC (Plasma Polymerized Fluorocarbon Coating) is coated on the sheet to improve the waterproof ability of the mesh sheet.

The present invention has been described above with reference to one embodiment shown in the drawings, but those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom.

Claims (5)

1. A VOC sensor installed at the gasoline nozzle to detect volatile organic compounds in the fuel oil tank of the vehicle to be refueled;

   A sensor power supply unit for supplying power to the VOC sensor;

   A signal detector for detecting a signal sensed by the VOC sensor;

   Hooking off the lubricator nozzle for lubrication supplies power to the VOC sensor through the sensor power supply, and detects the non-volatile organic matter inside the tank when the spout of the lubricator nozzle is inserted into the feed port of the vehicle fuel tank to be refueled. A mixed oil prevention control unit which receives a signal and calculates a concentration of nonvolatile organic substances detected through signal processing to determine a fuel oil type of the vehicle, and instructs the solenoid controller to shut off the solenoid valve when the mixed oil is determined; And

   And a solenoid controller for blocking the solenoid valve of the oil supply pipe under the control of the mixing control unit.
2. According to claim 1, wherein the blending prevention device

   If mixed oil is detected, further comprises an alarm unit for generating an alarm sound according to the control signal,

   The mixed oil prevention control unit, if determined as mixed, control the alarm unit to generate a mixed sound prevention device, characterized in that to generate an alarm sound.
3. The method of claim 1, wherein the VOC sensor

   The semiconductor VOC sensor chip is mounted in the inner space of the housing where a hole is formed at one side, and the hole is attached with a micro mesh network for passing gas such as volatile organic gas and blocking gas such as gasoline or case. When mixed with the semiconductor sensor chip, VOC gas is detected, characterized in that the oil mixture mixing device.
4. The method of claim 3, wherein the semiconductor VOC sensor chip

   And a gas detector which reacts with VOC gas to cause a change in resistance, and a heater that heats the detected VOC gas to an appropriate temperature to increase the activation energy of the detected gas. The gas detector includes a Pt catalyst in a SnO ₂ material. Mixing prevention device of the lubricator, characterized in that the addition.
5. The method of claim 3, wherein the micro mesh network is

   A blending prevention device for a lubricator, having a mesh diameter of 30 to 100 µm and having a hydrophobic surface coated with PPFC on the mesh sheet to improve the waterproofing ability of the mesh sheet.

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