KR200244542Y1 - Fuel supply device for LP fuel engine - Google Patents

Abstract

The present invention relates to a fuel supply device for an LP fuel engine. When the ambient temperature is low, such as a cold weather, the heated external air is blown into the cylinder to transfer the LP fuel. It is to provide a fuel supply device for the LP fuel engine to ensure that the LP fuel is transported and supplied to the combustion chamber of the engine, to improve the startability in cold weather and to suppress the emission of harmful gases at the beginning.

[Index]

LP fuel, cold start, fuel supply

Description

Fuel supply for LP fuel engine

The present invention relates to a fuel supply device for an LP fuel engine, and more specifically, LP to heat the LP fuel introduced into the combustion chamber in a cold weather to ensure engine startability and to suppress the emission of harmful gases at the beginning of startup. A fuel supply device for a fuel engine.

In general, as shown in FIG. 1, a fuel supply apparatus of an LP fuel engine includes a bomb 101 filled with LP fuel in a liquid state and a gas state, and a filter 102 for removing foreign substances contained in the LP fuel. And an solenoid valve 103 for controlling the flow of LP fuel while opening and closing under the control of an engine electronic controller (not shown), and an evaporator for adjusting the pressure of the LP fuel while converting the liquid LP fuel into a gaseous state ( 104, a mixer 105 for mixing external air and LP fuel and supplying it to the combustion chamber of the engine, and an engine 106 for obtaining propulsion by the expansion force generated during LP fuel combustion.

When the solenoid valve 103 is opened by the control of the engine electronic controller that recognizes the operation of the ignition key in the LP fuel engine configured as described above, the liquid LP fuel filled in the cylinder 101 passes through the filter 102. Is filtered and supplied to the evaporator 104.

The evaporator 104, which is divided into a high pressure regulator and a low pressure regulator, lowers the pressure of the LP fuel and supplies it to the mixer 105 connected to the combustion chamber of the engine 106.

At this time, the mixer 105 is supplied with the outside air through the air volume regulator together with the LP fuel.

As such, the LP fuel and the air amount supplied to the mixer 105 are controlled by the gas amount regulator and the air amount regulator which are not shown by the control of the engine electronic controller which receives the input of the accelerator pedal and the air pressure sensor.

However, LP fuel has a disadvantage in that, if the ambient temperature is low, such as cold weather, the fuel is not vaporized so that starting is not performed well, and at this time, a lot of harmful exhaust gases are emitted.

In addition, when the ambient temperature is too low, LP fuel discharged from the bomb often freezes in the inlet pipe so that the vehicle equipped with the LP fuel engine is not started.

Therefore, the present invention was devised to solve the conventional problems as described above, and when the ambient temperature is low, such as a cold weather, the heated external air is blown into the cylinder to be heated by an inlet pipe for transporting LP fuel. LP fuel in gaseous state is transported with air to be supplied to the combustion chamber of the engine, thus providing a fuel supply device for the LP fuel engine that improves startability in cold weather and suppresses the emission of harmful gases at the beginning. There is a purpose.

1 is a schematic view showing a fuel supply of a conventional LP fuel engine

2 is a schematic view showing a fuel supply device of the LP fuel engine according to the present invention

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

1: engine 2: mixer

3: evaporator 4: valve

5: bomb 6: gas fuel

7: liquid fuel 8: sub inlet pipe

9: main inlet pipe 10: pressurized / heated blowing means

11: heater 12: blowing fan

13 inlet port 14 check valve

15: solenoid valve 16: filter

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The present invention is a cylinder (5) filled with LP fuel in liquid and gaseous state, a filter (16) for removing foreign substances contained in the LP fuel, and opened and closed under the control of the engine electronic controller. The solenoid valve 15 which regulates the flow, the evaporator 3 which adjusts the pressure of LP fuel while converting liquid LP fuel into a gas state, and the mixer which mixes external air and LP fuel, and supplies it to the combustion chamber of an engine (2) and a fuel supply device for an LP fuel engine comprising an engine (1) which obtains a propulsive force by the expansion force generated during the combustion of an LP fuel, the fuel supply device being driven under the control of an engine electronic control unit and started with external air at start-up Blower 12 for supplying gas to the upper part of the gaseous fuel 6 in the cylinder 5, a heater 11 for heating the air introduced by the blower 12, and LP fuel is prevented from flowing back Pressurization / consisting of a check valve 14 The heating blowing means 10 and the valve 4 which is opened and closed by the engine electronic control device according to the starting state are provided, and are separately extended from the upper part with the gaseous fuel 6 inside the cylinder 5 to filter 16. It is characterized in that it further comprises a sub inlet pipe (8) connected to the front end main inlet pipe (9).

This will be described in more detail as follows.

Figure 2 is a schematic diagram showing a fuel supply device of the LP fuel engine according to the present invention, as mentioned in the conventional LP fuel engine, the fuel supply device is a cylinder (5) filled with the LP fuel in the liquid state and gaseous state and In addition, the filter 16 for removing foreign substances contained in the LP fuel, the solenoid valve 15 for controlling the flow of the LP fuel while opening and closing under the control of the engine electronic controller, and the liquid LP fuel in a gaseous state An evaporator (3) for adjusting the pressure of LP fuel while converting, a mixer (2) for mixing external air and LP fuel and supplying it to the combustion chamber of the engine, and an engine (1) for obtaining propulsion by the expansion force generated during combustion of the LP fuel (1). )

In addition, the gas fuel (6) portion of the cylinder (5) is provided with a pressurized / heated blower means (10) for heating and supplying the outside air at start-up, the upper portion of the pressurized / heated blower (10) An inlet 13 through which external air is introduced is formed, and a blower fan 12 is installed in the immediate vicinity of the inlet 13 so as to suck the outside air, and also directly behind the blower fan 12. The heater 11 which heats the external air which passed the blower fan 12 is provided.

In addition, the check valve 14 is installed at the rear of the heater 11, and the external air heated by the heater 11 is supplied into the cylinder 5 through the check valve 14. Lose.

On the other hand, the end of the pressurizing / heating blowing means 10 including the check valve 14 is connected to the gas fuel 6 part of the cylinder (5).

In particular, the sub inlet pipe 8 branched from the main inlet pipe 9 connecting the liquid fuel 7 portion of the bomber 5 to the filter 16 is opened and closed by an engine electronic control device according to the starting state. A valve 4 is provided, and the end of the sub inlet pipe 8 is connected to contact the gas fuel 6 portion of the cylinder 5.

The operation of the present invention configured as described above will be described.

When it is determined that the vehicle is started for the first time in a cold weather with low ambient temperature, the engine electronic control unit outputs an opening / closing signal to the valve 4 to connect the gas fuel 6 portion of the cylinder 5 to the filter 16. On the other hand, it supplies a drive current signal for operating the blower fan 12 and the heater 11 of the pressurized / heated blower 10.

Accordingly, the external air introduced through the suction hole 13 is sucked by the blower fan 12, and the external air sucked by the heater 11 is heated by the heater 11 and exits the check valve 14. It enters the gaseous fuel (6) part of (5).

In this case, the blower fan 12 includes a motor (not shown) to suck external air. When the blower fan 12 is substantially supplied with a driving current by the engine electronic controller, the blower fan 12 Along with the driving of the motor, a rotational drive for intake of external air is performed.

Subsequently, the hot air introduced into the gaseous fuel 6 of the bomber 5 is mixed with the vaporized LP fuel and then passed through the filter 16 and the solenoid valve 15 through the sub inlet tube 8 to the evaporator 3. Is transferred to).

That is, since the low-temperature liquid fuel 7 is not introduced into the evaporator 3 but the high-temperature gas fuel 6 is introduced, the liquid LP fuel is converted into the gas state without applying a separate vaporization heat, and then the mixer Through (2) it can be supplied to the combustion chamber of the engine 1 to increase the startability, it is also possible to suppress the generation of harmful exhaust gas generated by the combustion of low-temperature LP fuel.

Here, the proportion of LP fuel is relatively reduced as a separate external air is introduced, and the overall ratio becomes thin. The air-fuel ratio of the initial engine start is a condition that can be preheated because it does not require a high load condition. It is enough to burn, so there is no problem starting the engine.

The above operation is continued until the engine is operated to sufficiently heat the LP fuel by the engine heat, and when it is determined that the LP fuel can be sufficiently heated by the engine heat to supply the engine 1, the engine electronic control apparatus LP gas in the gaseous state is stopped by the blower fan 12 and the heater 11 of the pressurized / heated blower means 10 that have been operated so far, and the valve 4 is closed. By blocking the flow into the evaporator (3), from this time the liquid LP fuel is supplied to be able to operate the engine (1) normally.

At this time, since the check valve 14 is installed between the gas fuel 6 portion of the cylinder 5 and the pressurizing / heating blowing means 10, the gas fuel 6 of the cylinder 5 leaks to the outside. This can be prevented in advance.

As described above, the present invention provides an LP fuel engine fuel supply device capable of heating the LP fuel introduced into the combustion chamber at the beginning of a cold engine start, thereby ensuring startability of the engine and discharging harmful gas at the start of the engine. There is an advantage that can be suppressed.

Claims (1)

A bomb (5) filled with liquid and gaseous LP fuel, a filter (16) for removing foreign substances contained in the LP fuel, and an LP fuel flow is controlled while being opened and closed under the control of an engine electronic controller. The solenoid valve 15, an evaporator 3 for adjusting the pressure of the LP fuel while converting the liquid LP fuel into a gas state, and a mixer 2 for mixing the external air and the LP fuel and supplying them to the combustion chamber of the engine In the fuel supply device of the LP fuel engine comprising an engine (1) to obtain a driving force by the expansion force generated during the combustion of LP fuel, It is driven under the control of the engine electronic control unit, and the blower 12 which supplies external air to the upper part of the gaseous fuel 6 inside the cylinder 5 at start-up, and heats the air introduced by the blower 12 A pressurizing / heating blowing means (10) consisting of a heater (11), a check valve (14) for preventing backflow of LP fuel, The valve 4 is opened and closed by the engine electronic control device according to the starting state, and is extended separately from the upper part of the gaseous fuel 6 inside the cylinder 5 so that the front main inlet pipe 9 of the filter 16 is installed. The fuel supply of the LP fuel engine, characterized in that it further comprises a sub inlet pipe (8) connected to.