KR100384297B1 - Method for storage remaining gas of LPG car and device thereof - Google Patents

Abstract

The present invention relates to an automobile using LPG as a fuel.

The present invention can collect the fuel remaining in the LPG fuel hose in the residual fuel collecting tank when the LPG vehicle is started off or the LPG fuel supply switch is turned off, and then used when restarting the LPG vehicle, thereby consuming unnecessary fuel. LPG, which provides an environmentally friendly vehicle by reducing exhaust gas caused by fuel consumption while improving fuel efficiency of the vehicle, and prevents deterioration of vehicle startability of cold weather due to residual gas in a fuel hose as in the related art. An apparatus for collecting residual gas of a vehicle and a method of collecting the same are provided.

Description

Residual gas collection device and method for collecting the LPI vehicle {Method for storage remaining gas of LPG car and device about}

The present invention relates to an automobile using LPG as a fuel. In particular, the fuel remaining in the LPG fuel hose when the LPG vehicle is turned off or when the LPG switch is turned off is collected in the residual fuel capture tank. Residual gas collection device of LPG vehicles, which can be used when restarting LPG vehicles, prevents unnecessary fuel consumption and improves fuel efficiency of vehicles while providing environmentally friendly vehicles by reducing exhaust gas caused by fuel consumption. And a collection method thereof.

Conventional LPG vehicles have a structure in which the supply of LPG, which is supplied to the intake manifold through a hose from the LPG fuel tank, is cut off when the vehicle is turned off or when the switch for supplying LPG fuel is turned off. .

At this time, the hose is left in the residual gas which is not supplied to the intake manifold according to the start-off of the vehicle or the off operation of the LPG fuel supply switch.

In addition, in the case where residual gas is present in the fuel hose, particularly in a cold season, the starting gas of the vehicle is greatly deteriorated while freezing of the fuel hose occurs due to the residual gas.

Therefore, the present invention has been made to solve the above-mentioned conventional problems, an object of the present invention, the fuel remaining in the LPG fuel hose during the start-off of the LPG vehicle or the off operation of the LPG fuel supply switch tank capture tank It can be used to restart LPG vehicles after collecting them, thereby reducing the exhaust gas caused by the consumption of fuel while preventing unnecessary fuel consumption, providing an environment-friendly vehicle, and improving the fuel efficiency of the vehicle. As in the present invention to provide a residual gas collecting device and a method of collecting the LPG vehicle to prevent the deterioration of vehicle startability of cold weather due to residual gas in the fuel hose.

1 is a block diagram of a residual gas collecting device of an LPG vehicle according to an embodiment of the present invention.

2 is an embodiment of the present invention to the residual fuel trapping device when the vehicle is turned off

Flow chart showing residual gas collection.

Figure 3 is a residual smoke when the LPG fuel supply switch of the vehicle is off as an embodiment of the present invention

Flow chart showing residual gas collection to material collection device.

4 shows the fuel collected in the residual fuel collecting device when the engine of the vehicle operates normally.

Flow chart showing flow to feed.

※ Explanation of code for main part of drawing

1: LPG fuel tank 2,3: Weather / liquid fuel hose

4: Negative pressure hose 5: Relief valve

10: residual fuel capture device

V1, V2: Fuel side gas phase / liquid solenoid valve

V3, V4: Engine side liquid / liquid solenoid valve

V5, V6: gas / liquid solenoid valve on the collecting device side

V7: Negative pressure solenoid valve

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a configuration diagram of a residual gas collecting device of an LPG vehicle according to an embodiment of the present invention.

As shown in FIG. 1, the gaseous solenoid valve V1 on the fuel side that blocks fuel supply from the LPG fuel tank 1 by opening / closing according to on / off switching of an LPG fuel supply switch (not shown). And liquid solenoid valve (V2);

A gas phase solenoid valve (V3) and a liquid solenoid valve (V4) on the engine side, which are closed / opened according to the on / off switching of the LPG fuel supply switch;

When the engine is driven, a relief valve 5, which is a safety device, is provided to create a vacuum negative pressure through the negative pressure forming hose 4 connected to the intake manifold, and to prevent the negative pressure below a predetermined pressure, and the gaseous solenoid valve V3 on the engine side. ) And the liquid solenoid valve (V4), which is operated when it is opened, collects the high pressure LPG gas remaining in the gas phase fuel hose (2) and the liquid fuel hose (3), and stops the engine starting while stopping the fuel supply to the engine. A collecting device 10;

The engine is closed so that the residual fuel collecting device 10 can create a continuous vacuum negative pressure during engine starting, and the LPG residual gas collection to the residual fuel collecting device 10 is performed when the LPG fuel supply switch is turned off or started. A gas phase solenoid valve V5 and a liquid solenoid valve V6 on the collecting device side open to be made;

The negative pressure control solenoid valve (V7) opened to supply fuel collected to the residual fuel collecting device 10 to the intake manifold and the engine through the negative pressure forming hose 4 when the engine coolant temperature is greater than the set value when the LPG vehicle starts on. ); It consisted of.

According to another aspect, each of the solenoid valve (V1 ~ V7) is controlled to open and close from the clockwise control sequence of the engine electronic control unit (ECU) at the time of the off operation of the LPG fuel supply switch or the start-up of the vehicle ,

The engine electronic control unit collects high-pressure residual gas remaining in the gas phase fuel hose (2) and the liquid fuel hose (3) by the residual fuel collecting device (10) in accordance with the start-off of the vehicle, the off operation of the LPG fuel supply switch and,

At the start-up of the vehicle, a control operation of supplying the residual gas collected in the residual fuel collecting device 10 to the engine through the intake manifold is executed.

That is, FIG. 2 is a flowchart showing residual gas collection to the residual fuel collecting device 10 when the vehicle is turned off as an embodiment of the present invention.

After judging whether the vehicle is off, close the negative pressure control solenoid valve (V7) and the gas / liquid solenoid valves (V1 to V4) on the fuel and engine sides and turn off the gas / liquid solenoid valve (V5) on the collecting device side. Opening V6;

Checking the set time of opening / closing each solenoid valve (V1 to V7) when the gas / liquid solenoid valve (V5) and V6 on the collecting device side are opened;

Closing the gas / liquid solenoid valves V5 and V6 on the collecting device side when the set time has elapsed as a result of the check; Proceeded to.

3 is a flowchart showing residual gas collection to the residual fuel collecting device 10 when the LPG fuel supply switch of the vehicle is turned off as an embodiment of the present invention.

After judging whether the LPG fuel supply switch is turned off, close the negative pressure control solenoid valve (V7) and the gas / liquid solenoid valves (V1 to V4) on the fuel and engine sides and turn off the gas / liquid solenoid valve (V5) on the collecting device side. ) V6 is opened;

After the gas / liquid solenoid valve V5 and V6 on the collecting device side are judged whether the vehicle is turned off, the gas / liquid solenoid valve V5 and V6 on the collecting device side and the negative pressure control solenoid valve are turned off. Closing V7; Proceeded to.

On the other hand, Figure 4 is a flow chart showing a flow of supplying the fuel collected in the residual fuel collecting device 10 to the engine through the intake manifold when the engine of the vehicle in normal operation,

After determining whether the vehicle is started or whether the LPG fuel supply switch is turned on, close the negative pressure control solenoid valve (V7) and the collecting device side gas / liquid solenoid valve (V5) (V6) and turn on the gas / liquid on the fuel side and the engine side. Opening solenoid valves V1 to V4;

When selectively opening / closing the valves V1 to V7, the cooling water temperature of the engine is compared with the set temperature value. If the cooling water temperature of the engine is greater than the set temperature value, the negative pressure control solenoid valve V7 is opened to collect residual fuel. Supplying the residual gas collected in the apparatus 10 to the engine through the intake manifold; Characterized in proceeding to.

Referring to Figures 1 to 4 attached to the operation of an embodiment of the present invention configured as described above are as follows.

First, when the vehicle is started or the LPG fuel supply switch is turned off, the electronic control unit of the engine closes the negative pressure control solenoid valve V7 and the gas / liquid solenoid valves V1 to V4 on the fuel side and the engine side, and the collecting device side. A control operation is performed to open the gas phase / liquid solenoid valves V5 and V6.

That is, when the LPG fuel supply switch is turned off, the engine electronic control unit closes the fuel side gas phase / liquid solenoid bar V1 and V2 to block the supply of LPG fuel from the LPG fuel tank 1 of the vehicle. Open the gas / liquid solenoid valves V3 and V4 on the engine side.

If a condition is established in which the fuel is no longer supplied while the engine is being started, the engine electronic control unit continues to drive the engine until all the fuel in the gas phase fuel hose 2 and the liquid fuel hose 3 is burned.

At this time, according to the control operation of the engine electronic control unit, the collection device side gas phase / liquid solenoid valves V5 and V6 are all open.

As the residual fuel collecting device 10 operates as the valves V5 and V6 are opened, all fuel in the gaseous and liquid fuel hoses 2 and 3 is collected so that the fuel supply to the engine side is no longer performed. In the meantime, the engine was turned off.

In other words, a vacuum negative pressure is formed in the residual fuel collecting device 10, and the relief valve 5 which is a safety device while continuously making vacuum negative pressure by the negative pressure forming hose 4 connected to the intake manifold when the engine is driven. Through the bar to prevent the formation of negative pressure below a certain pressure,

The engine electronic control unit closes the gas phase / liquid solenoid valves V5 and V6 of the collecting device side during normal operation to form a continuous vacuum negative pressure in the residual fuel collecting device 10 during engine starting.

On the other hand, when the off condition of the LPG fuel supply switch is reached, the engine electronic control unit performs a control operation to close the fuel side gas phase / liquid solenoid valve V3 and V4, so that the gas / liquid fuel hose 2, 3 Only high pressure fuel is left inside.

At this time, when the gas phase / liquid solenoid valves V5 and V6 of the collecting device side are opened in the engine electronic control unit, the high-pressure residual gas remaining in the gas / liquid fuel hoses 2 and 3 is low pressure close to vacuum. The fuel is collected by the residual fuel collecting device 10, and the engine can be started off without further fuel supply.

In addition, since the gas phase / liquid solenoid valve V5 and V6 of the collecting device side are closed from the control operation of the engine electronic control unit together with the start-off of the vehicle, the residual fuel collecting device 10 collects residual fuel. This will be possible.

Here, the residual fuel in the above state remains in the gas phase / liquid fuel hose (2) (3) even when only the vehicle is turned off without turning off the LPG fuel supply switch.

Since the negative pressure close to the vacuum is formed in the residual fuel collecting device 10, when the collecting device side gas phase / liquid solenoid valve V5 and V6 are opened in the engine electronic control unit together with starting of the vehicle, The high pressure residual gas in the liquid fuel hoses 2 and 3 can be collected by the residual fuel collecting device 10.

On the other hand, supplying the fuel collected in the residual fuel collecting device 10 to the engine through the intake manifold when the engine of the vehicle is in normal operation, as shown in Figure 1 and 4,

When the vehicle starts or the LPG fuel supply switch is turned on, the engine electronic control unit closes the negative pressure control solenoid valve (V7) and the collecting device side gas / liquid solenoid valve (V5) (V6), and the gas / liquid phase on the fuel side and the engine side. Open the solenoid valves V1 to V4.

Thereafter, in the selective opening / closing of the valves V1 to V7, the engine electronic control unit compares the cooling water temperature of the engine with a set temperature value.

As a result of the comparison, if the coolant temperature of the engine is greater than the set temperature value, the engine electronic control unit opens the negative pressure control solenoid valve V7 and supplies the residual gas collected in the residual fuel collecting device 10 to the engine through the intake manifold. To enable the operation of the vehicle.

As described above, the present invention collects the fuel remaining in the LPG fuel hose in the residual fuel collection tank when the LPG vehicle is turned off or the LPG fuel supply switch is turned off, so that it can be used when the LPG vehicle is restarted. While reducing fuel consumption, it provides an environment-friendly vehicle by reducing exhaust gas caused by fuel consumption, and improves fuel efficiency of the vehicle, while reducing the starting ability of a cold weather due to residual gas in a fuel hose as in the prior art. It provides a preventive effect.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

Claims (3)

An apparatus comprising a gas phase / liquid solenoid valve on the fuel side and an engine side which is opened or closed from the control operation of the engine electronic control unit when the on / off switching of the LPG fuel supply switch or the on / off of starting is performed. It operates when the gaseous / liquid solenoid valve on the engine side is opened according to the engine operation, collects the high pressure LPG gas remaining in the gaseous fuel hose and the liquid fuel hose, and stops the engine starting while stopping the fuel supply to the engine. An apparatus; The engine is closed so that the residual fuel trapping device can create a continuous vacuum negative pressure during engine start, and is opened to collect LPG residual gas to the residual fuel trapping device when the LPG fuel supply switch is turned off or starts up. Gas / liquid solenoid valves on the apparatus side; The LPG vehicle is composed of a negative pressure control solenoid valve which is opened to supply the fuel collected to the residual fuel collecting device to the intake manifold and the engine through the negative pressure forming hose when the engine's cooling water temperature is larger than the set value. Residual gas collection device of vehicle. Determining whether the start of the vehicle or the LPG fuel supply switch is turned off; Closing the negative pressure control solenoid valve and the gas / liquid solenoid valves on the fuel side and the engine side and opening the gas / liquid solenoid valve on the collecting device side when the vehicle starts or the LPG fuel supply switch is turned off; Checking the set time of opening / closing each solenoid valve at the time of turning off after determining whether the vehicle is started off; Capturing the high pressure residual gas in the gas phase / liquid fuel hose with the residual fuel collecting device by closing the gas / liquid solenoid valve and the negative pressure control solenoid valve on the collecting device side when the set time has passed; Residual gas collection method of the LPI vehicle, characterized in that proceeding to. The method of claim 2, When the vehicle engine is operating normally, the engine supply of the fuel collected in the residual fuel collecting device is Determining whether the vehicle start or LPG fuel supply switch is turned on in the closed state of the gas / liquid solenoid valve and the negative pressure control solenoid valve on the collecting device side; Checking the cooling water temperature of the engine after opening the gas / liquid solenoid valves on the fuel side and the engine side when the determination result is turned on; Opening the negative pressure control solenoid valve when the cooling water temperature of the engine is greater than the set temperature value, and supplying the fuel collected in the residual fuel collecting device to the engine through the intake manifold; Residual gas collection method of the LPI vehicle, characterized in that proceeding to.