KR100621434B1 - Fuel supply system for diesel engine - Google Patents

Abstract

The present invention relates to a fuel supply system of a diesel engine, in which a vegetable oil tank accommodating vegetable oil and a light oil tank accommodating light oil are respectively installed to generate power by mixing vegetable oil and light oil. More specifically, an engine A heating unit connected to the cooling water circulation pipe via the heating unit, which is installed in the vegetable oil tank and heats the vegetable oil contained in the vegetable oil tank; A temperature sensor installed at any one of the inside of the vegetable oil tank and the vegetable oil supply pipe to detect the temperature of the vegetable oil; It is connected to the vegetable oil tank is coupled to a predetermined position of the vegetable oil supply pipe for supplying the vegetable oil to the engine, the predetermined size of the mesh to remove and refine the solidified coagulant contained in the vegetable oil via the vegetable oil supply pipe At least one vegetable filter having; When the start signal is transmitted from the key holder to the controller by being coupled to the end of the vegetable oil supply pipe and the diesel fuel supply pipe for supplying the diesel fuel via the diesel filter from the diesel oil tank to the engine, the diesel oil supply pipe connecting valve is opened according to the signal of the controller. After the diesel fuel is supplied to the injection pump, the fuel oil supply pipe connecting valve and the vegetable oil supply pipe connecting valve are selectively opened and closed by the control signal of the control unit according to the vegetable oil temperature detected by the temperature sensor to supply fuel to the injection pump. And a switching valve to make it possible.

Accordingly, the present invention relates to a fuel supply system of a diesel engine, in which a vegetable oil tank containing vegetable oil and a light oil tank containing light oil are respectively installed to generate power by mixing vegetable oil and light oil. After the ignition, the temperature of the vegetable oil (including waste vegetable oil) in the vegetable oil tank is increased due to the heating of the heating part connected to the cooling water circulation pipe, thereby preventing the fuel supply line from clogging and starting the engine. It provides a fuel supply system for diesel engines that makes it possible to use vegetable oil as fuel in a short time after the catch.

Description

 Fuel supply system for Diesel engine

1 is a schematic view showing a first embodiment of a fuel supply system according to the present invention;

2 shows a second embodiment of a fuel supply system according to the invention;

3 shows a third embodiment of a fuel supply system according to the invention;

Figure 4 is a schematic diagram showing the overall configuration of a fuel supply system according to the present invention.

<Description of the symbols for the main parts of the drawings>

101: vegetable oil tank 102: diesel oil tank

103: heating unit 104: vegetable oil supply pipe

105: vegetable filter 106: diesel filter

107: diesel oil supply pipe 108: diesel oil supply pipe valve

109: injection pump 110: temperature sensor

111: vegetable oil supply pipe connection valve

112: switching valve 113: electric heater

114: fuel discharge pipe 115: main return line

116: vegetable oil return line 117: light glass turn line

119: cooling water circulation pipe 120: bypass pipe

121: bypass valve

 The present invention relates to a fuel supply system of a diesel engine in which a vegetable oil tank containing vegetable oil and a light oil tank containing light oil are respectively installed to generate power by mixing vegetable oil and light oil. After the ignition, the temperature of the vegetable oil (including waste vegetable oil) in the vegetable oil tank is increased due to the heating of the heating part connected to the cooling water circulation pipe, thereby preventing the fuel supply line from clogging and starting the engine. It relates to a fuel supply system of a diesel engine that makes it possible to use vegetable oil as fuel in a short time after the catch.

In general, diesel engines (hereinafter referred to as engines) are mainly used in engines for passenger cars, trucks, tractors, ships, etc. because of high fuel efficiency and power, and are widely used until now, and in Europe, diesel cars have been widely used for a long time. There is a situation.

However, in the case of automobiles employing the above-mentioned diesel engines, soot (fine dust, sulfur dioxide, hydrocarbons, nitrogen), etc., are generated in large quantities due to unsafe combustion, and thus are classified as a leading cause of environmental pollution, and in recent years, smoke generated from diesel engines. Increasingly, policies to reduce energy consumption are being strengthened globally, and Europe and developed countries are already strictly restricting the emissions of diesel-powered vehicles.

Due to the seriousness and regulation of the environmental pollution of diesel vehicles, the developed countries of the world have studied fuels to replace diesel, and the result of this research is called biodiesel made from vegetable oil (fuel made by reacting with vegetable oil and methanol). Diesel fuels have been developed, and these eco-friendly fuels have been actively used and commercialized by consumers in developed countries.

At present, domestic private companies have tried to develop and disseminate alternative fuels such as biodiesel. However, due to the limitation of practical technology and high production cost of raw materials, the research results are not meeting expectations and consumption is not activated.

In particular, the cold filter plugging point, which is an item of the quality standard, is an anti-solidification quality standard for biodiesel in winter, and a catalyst for preventing solidification, which is already patented in Korea, should be added to the fuel manufacturing process. Since only European biodiesel produced by fluid oil is applicable, it is not applicable to biodiesel made of soybean oil, which is a domestic fuel, which is a major obstacle to commercialization.

The present invention has been made in order to solve the above problems, vegetable oil, including waste cooking oil is solidified in the fuel supply process, or vegetable oil so that the vegetable oil can be supplied as a fuel as soon as the gas oil is ignited in the engine It is the purpose to be able to prevent the coagulation of vegetable oil without using a catalyst for preventing the coagulation of biodiesel by heating the whole amount can be used as fuel.

The above object is installed in the fuel supply system of the diesel engine, the vegetable oil tank (101) for accommodating vegetable oil and the diesel oil tank (102) for accommodating light oil are respectively installed to generate power by mixing vegetable oil and light oil. The heating unit 103 is connected to the cooling water circulation pipe 119 via the engine and is installed in the vegetable oil tank 101 to heat the vegetable oil contained in the vegetable oil tank 101; A temperature sensor 110 installed at any one of the inside of the vegetable oil tank 101 and the vegetable oil supply pipe 104 to detect the temperature of the vegetable oil; It is connected to the vegetable oil tank 101 is coupled to a predetermined position of the vegetable oil supply pipe 104 for supplying the vegetable oil to the engine, and removes the solidified solidified material contained in the vegetable oil via the vegetable oil supply pipe 104 At least one vegetable filter 105 having a mesh of a predetermined size and adapted to be purified; The start signal from the key holder (not shown) is coupled to the end of the vegetable oil supply pipe 104 and the end of the gas oil supply pipe 107 for supplying the gas oil via the gas oil filter 106 from the gas oil tank 102 to the engine. Is transmitted to a control unit (not shown), the gas oil supply pipe connecting valve 108 is opened in accordance with a signal of the control unit so that light oil is supplied to the injection pump 109, and then the vegetable oil detected by the temperature sensor 110. And a switching valve 112 which selectively opens and closes the gas oil supply pipe connection valve 108 and the vegetable oil supply pipe connection valve 111 according to a control signal of a temperature control unit so that fuel can be supplied to the injection pump 109. It is achieved by the fuel supply system of the diesel engine, characterized in that.

Then, the electric heater 113 (glow-plug) coupled to the fuel discharge pipe 114 of the switching valve 112 to heat the fuel supplied to the injection pump 109 selectively by the switching valve 112 to a predetermined temperature. It is preferable to further include).

Here, the switching valve 112, the injection pump 109 and the switching valve 112 constitutes the main return line 115, the switching valve 112 to the diesel oil tank 102 and the vegetable oil tank 101 A return valve (not shown) may be configured to configure the vegetable oil return line 116 and the light glass turn line 117 branching to the fuel oil by the control signal of the controller according to the fuel supplied to the injection pump 109. ) To open and close selectively.

In addition, the cooling water circulation pipe 119 connected to the cooling water circulation pipe 119 connected to the heating part 103 inside the vegetable oil tank 101 and drawn out to the outside of the vegetable oil tank 101 from the heating part 103. When the bypass pipe 120 is connected to the) side, and a predetermined temperature is sensed by the temperature sensor 110 and transmitted to the control unit, the cooling water does not pass through the heating unit 103 according to the control signal of the control unit. It is preferable to further include a bypass valve 121 for opening and closing the valve to pass through (120).

In addition, the control unit controls the electric heater 113 to be turned off when the diesel fuel supply pipe connection valve 108 of the switching valve 112 is turned on, and when the diesel oil is supplied, the electric heater 113 is turned off. It is desirable to ensure that it is turned on and only when vegetable oil is supplied.

On the other hand, an object of the present invention, the vegetable oil tank (101) for receiving vegetable oil and the diesel oil tank (102) for receiving diesel oil are installed, respectively, the fuel supply of the diesel engine to generate power by mixing vegetable oil and diesel oil. A system, comprising: a heating unit (103) connected to a cooling water circulation pipe (119) via an engine and installed in a vegetable oil tank (101) to heat vegetable oil contained in the vegetable oil tank (101); A temperature sensor 110 installed at any one of the inside of the vegetable oil tank 101 and the vegetable oil supply pipe 104 to detect the temperature of the vegetable oil; It is connected to the vegetable oil tank 101 is coupled to a predetermined position of the vegetable oil supply pipe 104 for supplying the vegetable oil to the engine, and removes the solidified solidified material contained in the vegetable oil via the vegetable oil supply pipe 104 At least one vegetable filter 105 having a mesh of a predetermined size and adapted to be purified; The start signal from the key holder (not shown) is coupled to the end of the vegetable oil supply pipe 104 and the end of the gas oil supply pipe 107 for supplying the gas oil via the gas oil filter 106 from the gas oil tank 102 to the engine. Is transmitted to a control unit (not shown), the gas oil supply pipe connecting valve 108 is opened in accordance with a signal of the control unit so that light oil is supplied to the injection pump 109, and then the vegetable oil detected by the temperature sensor 110. A switching valve 112 that selectively opens and closes the gas oil supply pipe connection valve 108 and the vegetable oil supply pipe connection valve 111 according to a control signal according to a temperature so that fuel can be supplied to the injection pump 109; An alarm unit (not shown) for alerting the driver of a fuel switching timing of the switching valve 112 when a predetermined temperature set by the temperature sensor 110 is detected; In the fuel supply system of the diesel engine, characterized in that it comprises a fuel switching button (not shown) for transmitting a signal to the control unit so that the valve opening and closing of the switching valve 112 as the driver intended after the alarm occurs in the alarm unit. Is also achieved.

Hereinafter, the configuration and operation of the present invention will be described with reference to FIGS. 1 to 4.

First, as shown in FIGS. 1 and 4, the fuel supply system according to the present invention includes a diesel oil tank 102 containing diesel oil used as diesel fuel and a vegetable oil tank configured to receive vegetable oil utilized as biodiesel ( 101 are respectively installed, and the fuel of the diesel oil tank 102 and the vegetable oil tank 101 is configured to be selectively pumped to the injection pump 109 by the switching valve 112 to be described below.

That is, the light oil of the light oil tank 102 follows a conventional fuel supply line, and the light oil of the light oil tank 102 is switched after the foreign matter is removed from the light oil filter 106 of the light oil supply pipe 107. Is supplied.

At this time, the switching valve 112 opens and closes the gas oil supply pipe connection valve 108 connected to the gas oil supply pipe 107 according to the control signal of the controller.

On the other hand, the vegetable oil tank 101 has a fear that the contained vegetable oil is solidified at a low temperature, and the solidified vegetable oil causes clogging the vegetable oil supply pipe 104, the vegetable oil tank 101 inside Figure 1 As shown in FIG. 3, after the hot coolant passes through the engine for a predetermined time, a portion of the coolant circulation pipe 119 passes through the vegetable oil tank 101 so that the coolant may be circulated back to the radiator or the engine.

That is, the heating unit 103 connected to the cooling water circulation pipe 119 is embedded in the vegetable oil tank 101 so that the cooling water passing through the engine is led to the heating unit 103 along the cooling water circulation pipe 119 to be vegetable. The vegetable oil in the oil tank 101 is heated.

At this time, the heating unit 103 is preferably wound up a predetermined number of times, as shown, to maximize the surface area that can be heat exchanged with the vegetable oil to increase the heat exchange efficiency.

Here, at least one of the vegetable oil supply pipe 104 predetermined position inside the vegetable oil tank 101 and the vegetable oil supply pipe 104 to feed the vegetable oil from the vegetable oil tank 101 to the switching valve 112 to be described below. The temperature sensor 110 is installed to sense the temperature, and the temperature sensor 110 detects the temperature of the vegetable oil and transmits it to the controller.

In addition, at least one vegetable filter 105 is installed in the vegetable oil supply pipe 104 connected to the vegetable oil tank 101 and the switching valve 112 to remove solidified mass or foreign matter of the solidified vegetable oil. As shown in FIG. 1, the vegetable oil supplied from the vegetable oil tank 101 is a first vegetative filter 105 having a mesh of a predetermined size, and after removing the solidified mass or foreign matter, the second vegetable property. It is desirable to purify once more precisely with the filter 105.

Accordingly, the vegetable oil supply pipe 104 is connected to the vegetable oil supply pipe connection valve 111 of the switching valve 112 having a structure of a 3-way swtching valve 112 as shown in FIG. 4. The diesel fuel supply pipe 107 is coupled to the diesel fuel supply pipe connecting valve 108, and the selected fuel is pumped to the injection pump 109 when an opening / closing operation of the connecting valve is performed to selectively use both fuels.

That is, when the key of the key holder is turned on and transmits a start signal to the control unit, the control unit transmits an opening signal of the gas supply pipe connecting valve 108 of the switching valve 112 simultaneously with the fuel supply signal, and when the first start is performed. Light oil is supplied to ignite the engine so that the coolant is heated while the engine is rotating for a predetermined time.

At this time, the cooling water passing through the cooling water circulation pipe 119 and the heating part 103 heats the vegetable oil while exchanging heat with the vegetable oil of the vegetable oil tank 101.

Meanwhile, the temperature sensor 110 continuously transmits the sensed temperature to the controller as described above while continuously communicating with the controller. When the transmitted temperature reaches a predetermined temperature, the controller switches the vegetable oil to the switching valve 112. In addition to transmitting the open signal of the supply pipe connecting valve 111 and at the same time to transmit the closing signal of the light oil supply pipe connecting valve 108 to block the supply of light oil and vegetable oil is supplied to the injection pump 109 to be injected into the engine.

Here, the fuel (vegetable oil or diesel oil) supplied to the injection pump 109 is heated to a temperature of 950 ℃ ~ 1,000 ℃ within 10 seconds to be quickly heated to a high temperature and supplied to the injection pump 109 as shown in FIG. It is preferable to pass via an electric heater 113 (glow-plug).

Meanwhile, the injection pump 109 and the switching valve 112 constitute a main return line 115, and the vegetable oil return branched into the diesel oil tank 102 and the vegetable oil tank 101, respectively, in the switching valve 112. When the control signal of the controller is transmitted to the switching valve 112 in response to the fuel supplied to the injection pump 109 by configuring the line 116 and the light glass turn line 117, the fuel is supplied to the oil tank corresponding to the supplied fuel. It is desirable to open and close the return valve selectively so that the excess fuel can be recovered smoothly.

That is, when the light oil supply pipe connecting valve 108 of the switching valve 112 is opened, the light glass turn valve for opening and closing the light glass turn line 117 is opened, and the vegetable oil supply pipe connecting valve 111 is opened. The control unit transmits a control signal to open the vegetable oil return valve for opening and closing the vegetable oil return line 116 so that the configuration of the return circuit and recovery of surplus fuel can be smoothly performed.

In addition, the cooling water circulation pipe 119 connected to the outside of the vegetable oil tank 101 with the cooling water circulation pipe 119 connected to the heating unit 103 inside the vegetable oil tank 101 and the heating unit 103. The bypass pipe 120 is configured to be distributed to each other, but the flow path is selectively set in the cooling water circulation pipe 119 connected to the bypass pipe 120 and the heating part 103. Install the bypass valve 121 (3-way valve).

When the predetermined temperature is detected by the temperature sensor 110 and transmitted to the controller, when the transmitted temperature reaches the predetermined temperature, the cooling water does not pass through the heating unit 103 according to the control signal of the controller. By opening and closing the bypass valve 121 to pass through 120, it is preferable to prevent the vegetable oil from overheating in the summer or when the temperature around the vehicle is high.

In addition, in the embodiment of the present invention, rather than having the control unit automatically perform the valve opening and closing operation of the switching valve 112 under the set condition, the control unit informs the driver only of the fuel switching time of the switching valve 112 to the driver. It may be desirable to have the fuel diverted depending on the intention.

That is, it is preferable that the fuel is switched by alerting the driver of the fuel switching time by the alarm unit and substantially transmitting the switching signal to the switching valve 112 by pressing the fuel switching button.

As described above, the present invention removes blockage of the fuel supply line by exchanging cooling water with vegetable oil as a catalyst, so that high-quality vegetable oil can be supplied to the engine, and in the case of mixing light oil and vegetable oil, By detecting the heating temperature and replacing the fuel on both sides at the appropriate time, the warm-up time can be shortened, and the equipment can be prevented in advance by using the fuel efficiently, and the return circuit can be configured at the time of using the mixed fuel. It is possible to smoothly recover the spent fuel, and in particular, the heat exchange with the vegetable oil by the cooling water can prevent the solidification phenomenon caused by the solidification of the vegetable oil occurring in the winter to prevent the solidification of biodiesel, a foreign product developed. Import of catalyst for the prevention of coagulation by replacing catalyst It is possible to save the foreign currency consumed, and to use vegetable oil in diesel engines at low cost, thereby having the effect of universally commercializing diesel engines in which vegetable oil and diesel oil are mixed.

Claims (6)

In the fuel supply system of a diesel engine that is provided with a vegetable oil tank for accommodating vegetable oil and a light oil tank for acquiring diesel oil to generate power by mixing vegetable oil and light oil, A heating unit connected to the cooling water circulation pipe via the engine and installed in the vegetable oil tank to heat the vegetable oil contained in the vegetable oil tank; A temperature sensor installed at any one of the inside of the vegetable oil tank and the vegetable oil supply pipe to detect the temperature of the vegetable oil; It is connected to the vegetable oil tank is coupled to a predetermined position of the vegetable oil supply pipe for supplying the vegetable oil to the engine, the predetermined size of the mesh to remove and refine the solidified coagulant contained in the vegetable oil via the vegetable oil supply pipe At least one vegetable filter having; When the start signal is transmitted from the key holder to the controller by being coupled to the end of the vegetable oil supply pipe and the diesel fuel supply pipe for supplying the diesel fuel via the diesel filter from the diesel oil tank to the engine, the diesel oil supply pipe connecting valve is opened according to the signal of the controller. After the diesel fuel is supplied to the injection pump, the fuel oil supply pipe connecting valve and the vegetable oil supply pipe connecting valve are selectively opened and closed by the control signal of the control unit according to the vegetable oil temperature detected by the temperature sensor to supply fuel to the injection pump. A diesel engine fuel supply system comprising a switching valve to enable. The method of claim 1, And a glow-plug coupled to a fuel discharge pipe of the switching valve to heat the fuel supplied to the injection pump selectively by the switching valve to a predetermined temperature. The method of claim 1, The switching valve, The main return line is configured in the injection pump and the switching valve, and the vegetable oil return line and the light glass turn line branched into the diesel oil tank and the vegetable oil tank are configured in the switching valve to control signals of the control unit according to the fuel supplied to the injection pump. A fuel supply system of a diesel engine, characterized in that for selectively opening and closing the return valve so that the fuel can be recovered by. The method of claim 1, The bypass pipe is connected to the cooling water circulation pipe side connected to the heating unit inside the vegetable oil tank and the cooling water circulation pipe side connected to the outside of the vegetable oil tank from the heating unit, and a predetermined temperature is sensed by a temperature sensor to the controller. When the transmission, the fuel supply system of the diesel engine further comprises a bypass valve for opening and closing the valve so that the coolant is passed through the bypass pipe in accordance with the control signal of the control unit without passing through the heating unit. The method according to claim 1 or 2, The control unit is a fuel supply system for a diesel engine, characterized in that when the diesel gas supply pipe connection valve of the switching valve is turned on (ON), the electric heater is turned off (OFF). In the fuel supply system of a diesel engine that is provided with a vegetable oil tank for accommodating vegetable oil and a light oil tank for acquiring diesel oil to generate power by mixing vegetable oil and light oil, A heating unit connected to the cooling water circulation pipe via the engine and installed in the vegetable oil tank to heat the vegetable oil contained in the vegetable oil tank; A temperature sensor installed at any one of the inside of the vegetable oil tank and the vegetable oil supply pipe to detect the temperature of the vegetable oil; It is connected to the vegetable oil tank is coupled to a predetermined position of the vegetable oil supply pipe for supplying the vegetable oil to the engine, the predetermined size of the mesh to remove and refine the solidified coagulant contained in the vegetable oil via the vegetable oil supply pipe At least one vegetable filter having; When the start signal is transmitted from the key holder to the controller by being coupled to the end of the vegetable oil supply pipe and the diesel fuel supply pipe for supplying the diesel fuel via the diesel filter from the diesel oil tank to the engine, the diesel oil supply pipe connecting valve is opened according to the signal of the controller. Fuel oil is supplied to the injection pump, and the fuel oil injection pipe connection valve and the vegetable oil supply pipe connection valve can be selectively opened and closed by the control signal of the controller according to the vegetable oil temperature detected by the temperature sensor. A switching valve which can be supplied with; An alarm unit for alerting the driver of fuel switching timing of the switching valve when a predetermined temperature set by the temperature sensor is detected; And a fuel conversion button for transmitting a signal to the controller so that the valve opening and closing of the switching valve is switched as the driver intends after the alarm is generated in the alarm unit.

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