KR20020077765A - device of prevent fuel outflow for vehicles fuel gas - Google Patents

Abstract

PURPOSE: A fuel outflow preventing apparatus for a gas fuel vehicle is provided to prevent the outflow of the gas fuel at the engine operation by closing a fuel outflow preventing valve, automatically, thereby improving the safety. CONSTITUTION: A fuel outflow preventing apparatus for a gas fuel vehicle is composed of a fuel tank(50), an injector(53) for injecting the liquid fuel from the fuel tank to an intake pipe of an engine in accordance with the driving condition, a pressure regulator(58) for keeping the fuel pressure in a determined value when the fuel pressure is more than the determined valve, a fuel outflow preventing valve(55,56) installed to open/close an inlet and outlet of the engine and outlet of the fuel tank, and an electronic control device(60) by which the fuel outflow preventing valve is closed when the pressure value detected by a pressure sensor is lower than an input valve.

Description

Device of prevent fuel outflow for vehicles fuel gas

The present invention relates to a fuel leakage prevention device for a gas fuel vehicle to ensure safety by emergency measures in the case of fuel leakage in the gas vehicle injecting the gas fuel in the liquid state due to damage of the fuel line and components.

More specifically, when the pressure of the gas fuel sent from the pump to the engine by the engine operation is lower than the set pressure value, it is determined that the fuel leaks due to breakage of the fuel line and the corresponding parts, so that the exit of the fuel tank and the engine The present invention relates to a fuel leakage prevention device for a gas fuel vehicle that automatically closes a fuel leakage prevention valve installed at an inlet and an outlet to prevent a gas fuel from leaking out.

As shown in FIG. 1, a gas fuel supply apparatus for a vehicle using gas fuel according to the prior art includes a fuel tank 1 for storing fuel in a saturated state and a fuel in the fuel tank 1 in a liquid phase. I) The fuel pump 2 discharged to the fuel pump 2 and the liquid fuel supplied from the fuel pump 2 through the supply line 6 (fuel line) to absorb the required injection amount according to the operating conditions of the engine (E) One way that is installed between the injector 7 to inject the engine, the discharge port of the injector 7 and the fuel tank 1 to maintain the pressure of the fuel supplied to the injector 7 within the set value range A pressure regulator 9 is provided.

According to the detected pressure value of the fuel detected by the pressure sensor 8 provided between the discharge port of the injector 7 and the pressure regulator 9, the fuel pump 2 is driven by a motor driver 13. And an electronic controller 12 (ECU) which controls by the control unit and determines the injection amount of the injector 7 in accordance with the operating conditions.

Reference numeral 3 denotes a shut off & excess flow valve installed at the outlet side of the fuel tank 1 and closed when the engine E stops, and 5 denotes an overflow prevention shutoff valve 3 and an injector 7. Shut off valve (11) is installed between the engine (E) shuts down (shut off valve), 11 is closed saturation state when passing through the pressure regulator (9) by closing the return passage (22) to the fuel tank (1) This is a one-way type return valve that maintains pressure.

However, in the gas fuel supply device as described above, the predetermined pressure (about 5 bar than the pressure value of the fuel tank 1) discharged due to the driving of the fuel pump 2 when the engine E is operated by the main relay 21. High] gas fuel, the overflow preventing shutoff valve (3) and the injector (7) provided at the outlet side of the fuel tank (1), even if the return flow path (22) described above is damaged or the corresponding parts are damaged or damaged. The shutoff valve 5 installed at the inlet side of the c) maintains an open state, and thus leaks continuously, thereby causing a problem of low safety.

Accordingly, an object of the present invention, when the pressure of the gas fuel sent from the pump to the engine side is lower than the set pressure value, it is determined that the fuel leaks due to breakage of the fuel line and the corresponding parts to determine the exit of the fuel tank and the engine It is to provide a fuel leakage prevention device for a gas fuel vehicle to improve the safety by preventing the outflow of gas fuel during engine operation by automatically closing the fuel leakage prevention valve installed on the inlet and outlet sides.

Another object of the present invention is to provide a fuel leakage prevention device for a gas fuel vehicle to improve the assembling performance by unifying the fuel leakage prevention valves respectively installed at the inlet and outlet sides of the engine, and to reduce the number of parts. To provide.

1 is a schematic diagram of a gas fuel supply apparatus according to the prior art,

2 is a schematic view of a fuel leakage preventing device for a gas fuel vehicle according to the present invention;

3 is an enlarged view of a fuel line in a fuel leakage preventing device for a gas fuel vehicle according to the present invention;

4 is a graph showing the presence or absence of fuel leakage according to the change in pressure in the fuel leakage prevention device for a gas fuel vehicle according to the present invention.

* Explanation of symbols used in the main part of the drawing *

50; Fuel tank

51; Fuel pump

52; Supply Euro

53; Injector

58; Pressure regulator

59; Pressure sensor

60; Electronic controller

61; Return

The object of the present invention described above is between a fuel tank for storing fuel in a saturated state, an injector for injecting liquid fuel discharged from the fuel tank into the intake pipe of the engine according to the operating conditions, and between the injector discharge port and the fuel tank. A pressure regulator which is installed and opened when the pressure of the fuel supplied to the injector exceeds the set value, and which is installed to open and close the outlet of the fuel tank and the inlet and outlet of the engine; And an electronic control device for controlling the fuel leakage prevention valve to close when the pressure value detected by the pressure sensor for detecting the pressure of the fuel supplied to the pressure regulator is lower than a preset input value and the fuel is discharged. It is achieved by providing a fuel leakage prevention device for a gas fuel vehicle, characterized in that.

According to a preferred embodiment, the pressure sensor described above is provided between the return outlet of the injector and the pressure regulator.

According to a preferred embodiment, a fuel leakage prevention valve is provided in one unit to be installed at the inlet and the outlet of the engine so that the fuel supplied to the engine side and the fuel returned to the fuel tank side can be blocked at the same time.

According to a preferred embodiment, when the pressure value detected by the pressure sensor described above is smaller than the pressure value set to close the valve of the pressure regulator and when a pressure exceeding the pressure set in the pressure regulator occurs, Warning means for generating a warning signal.

According to a preferred embodiment, the fuel leakage prevention valves are installed at the inlet of the engine and the outlet of the fuel tank so that the fuel supplied to the engine side and the fuel returned to the fuel tank side can be blocked at the same time, and the fuel leakage prevention valve is closed. When the pressure regulator valve is to close automatically.

According to a preferred embodiment, a fuel leakage prevention valve is installed at the inlet and the outlet of the engine so that the fuel supplied to the engine side and the fuel returned to the fuel tank side can be shut off when the fuel is discharged. When driving and in the normal control state is to control the fuel leakage prevention valve to be closed by the control signal of the fuel pump and the predetermined pressure sensor control signal.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are intended to be described in detail to be easily carried out by those skilled in the art to which the present invention pertains, and thus the present invention It does not mean that the technical spirit and scope of the company is limited.

2 and 3, a fuel tank 50 for storing fuel in a saturated state, a fuel pump 51 for pressurizing the fuel in the fuel tank 50 and discharging it into a liquid phase, and a fuel pump 51 Is installed between the injector 53 and the injector discharge port 54 and the fuel tank 50 for injecting the fuel supplied from the supply path 52 through the supply flow path 52 to the intake pipe of the engine according to the operating conditions. It is provided with the pressure regulator 58 which opens when the pressure Pp of the fuel supplied to the injector 53 exceeds a setting value, and keeps it within a setting value range.

Fuel leakage preventing valves 55 and 56 and 57 installed to open and close the outlet of the fuel tank 50 and the inlet and outlet of the engine E, the return discharge port 54 and the pressure regulator of the injector, respectively. When the pressure value Pp detected by the pressure sensor 59 disposed between the 58 is lower than the pre-input pressure value Pr, it is determined that the fuel flows out, and thus the fuel leakage prevention valves 55 and 56, 57, an electronic control device 60 for controlling the closing.

At this time, the pressure regulator 58 described above is installed to open and close the return flow path 61 between the injector discharge port 54 and the fuel tank 50, and the pressure Pp of the fuel supplied to the injector 53 is set. The regulator valve 62 provided with the diaphragm 61 which opens when it is more than the value, and maintains the pressure supplied to the injector 53 within the set value range, and the closing of the return flow path 61 by the regulator valve 62 initially. The pressure regulator 58 exit-side pressure Pr acts on the upper portion of the diaphragm 61 so that the elastic member 63 elastically biases as a state and the pressure relative to the fuel pressure Pt in the fuel tank 50 can be maintained. Branch flow path 64 is formed so as to.

At this time, the fuel leakage prevention valves 56 and 57 installed at the inlet and outlet sides of the engine E to simultaneously block the fuel supplied to the engine E side and the fuel returned to the fuel tank 50 side. It is preferable to form by unification.

Reference numeral 65 closes the return flow path 61 for the fuel tank 50 by the elastic member 66 to maintain the pressure in the saturated state in the return flow path 61 when passing through the pressure regulator 58. The return valve 67 is a fuel level gauge which is connected to the float 68 to display the remaining flow rate of the fuel tank 50.

Hereinafter, with reference to the accompanying drawings, a method of using the fuel leakage prevention device for a gas fuel vehicle according to the present invention will be described in detail.

As shown in Figures 2 to 4, the fuel having a predetermined pressure (Pt) in the fuel tank 50 that is saturated according to the temperature and pressure conditions, the pressure is increased due to the pressure of the fuel pump 51 is a liquid state By passing through the cut-off valve 55 and the shut-off valve 55 installed in the supply passage 52 in order to maintain the flow rate is supplied to the injector 53 of the engine (E) at a predetermined pressure (Pp).

It is discharged from the above-mentioned fuel pump 51 by the elastic force of the elastic member 63 which is provided in the above-mentioned pressure regulator 58 and closes the return flow path 61, and elastically biases to an initial state, and is injected to the injector 53. The liquid fuel supplied can maintain the predetermined pressure Pp.

Therefore, the liquid fuel supplied to the injector 53 injects the precise injection amount required according to the operating condition of the engine E to the intake manifold of the engine E by the control of the electronic controller 60. Depending on the exact air-fuel ratio and driving conditions can be controlled.

At this time, the pressure Pp supplied to the injector 53 detected by the pressure sensor 59 provided between the injector 53 outlet side 54 and the pressure regulator 58 always satisfies the following expression.

Pp = (Pt) + (Pr) + (Pv), where Pr> Pv.

However, Pp is the pressure of the fuel supplied to the injector 53 in the liquid phase, Pr is the pressure for supporting the diaphragm 61 by the elastic member 63 of the pressure regulator 58, Pv is by the elastic member 66 The pressure supporting the return valve 65 is shown.

On the other hand, if the leakage occurs due to damage or breakage of the supply passage 52 between the fuel tank 50 and the pressure regulator 58 or the components installed in the supply passage 52 during operation of the engine E, the above-described pressure sensor ( The pressure Pp value of the fuel detected at 59 indicates a pressure value in the air, so that the value displayed on the gauge of the pressure sensor 59 represents "0".

That is, Pp = (Pt) + (Pr) + (Pv) = 0

In addition, when leakage occurs due to breakage or damage of the return flow path 61 between the pressure regulator 58 and the fuel tank 50 during operation of the engine E, the pressure of the fuel detected by the pressure sensor 59 described above ( Pp) value represents the pressure Pr value which supports the diaphragm 61 of the pressure regulator 58 as follows.

That is, Pp = (Pt = 0) + (Pr) + (Pv = 0) = Pr

Therefore, when leakage occurs due to damage or breakage of the fuel line or its components during operation of the engine E, the pressure Pp value of the fuel detected by the pressure sensor 59 described above is the diaphragm 61 of the pressure regulator 58. ) Is less than or equal to the pressure Pr value (Pp ≤ Pr).

That is, when the pressure Pp value detected by the above-described pressure sensor 59 is less than or equal to the pressure Pr value supporting the diaphragm 61, the fuel is leaked by the above-described electronic controller 60. By judging and closing the valve 55 provided at the outlet side of the fuel tank 50 and the fuel leakage preventing valves 56, 57 provided at the inlet and outlet sides of the engine E at the same time, the engine ( E) As the fuel is prevented from continuously flowing out during operation, safety can be ensured.

As shown in FIG. 4, when the pressure Pp value of the fuel detected by the pressure sensor 59 described above is smaller than the pressure Pr value supporting the diaphragm 61 (in the coordinates, "X" section). ), The electronic control device 60 generates a warning sound through a warning means such as a buzzer so that the driver may recognize the operation by determining a leakage accident or an operation failure due to a poor assembly of a corresponding part. Emergency measures may be taken by closing the fuel leakage preventing valves 55 and 56.

In addition, when the pressure Pp value of the fuel detected by the above-mentioned pressure sensor 59 exceeds the set pressure value (refers to exceeding the "Y" section in the coordinates) (the relief valve is operated To the driver through the warning means by the electronic control device 60 to take emergency measures.

On the other hand, when the pressure value Pp of the pressure sensor 59 at the initial start-up is smaller than the value of the pressure Pr which supports the diaphragm 61 (Pp <= Pr), a fuel shutoff valve may not open from the beginning. Can be. To this end, during the initial start-up, the fuel pump 51 is sufficiently driven, and the normal control signal of the fuel pump 51 enables the operation of the system according to the present invention at a time point at which normal control is made.

Although not shown, a separate indicator may be installed and monitored so that a driver may recognize the pressure Pt value of the fuel tank 50, and the fuel tank may be used in parallel with the fuel level gauge 67. Information relating to the temperature of 50 can be obtained, which makes it possible to control the fuel supply amount (referring to the injection time of the injector) to the engine E.

As mentioned above, according to a preferable embodiment, it has the following advantages.

If the pressure of the gas fuel sent from the pump to the engine is lower than the set pressure value, it is determined that the fuel is leaking due to the breakage of the fuel line and the corresponding parts, and the fuel outflow installed at the outlet of the fuel tank and the inlet and outlet of the engine The valve can be closed automatically to prevent the outflow of gas fuel during engine operation, improving safety.

In addition, the fuel leakage prevention valves respectively installed at the inlet and outlet sides of the engine are unified to improve the assemblability and reduce the cost of the corresponding parts.

Claims (6)

A fuel tank for storing fuel in a saturated state; An injector for injecting liquid fuel discharged from the fuel tank to an intake pipe of an engine according to an operating condition; A pressure regulator installed between the injector discharge port and the fuel tank to open when the pressure of the fuel supplied to the injector exceeds a set value and to maintain the set value within the set value range; A fuel leakage prevention valve installed to open and close the outlet of the fuel tank and the inlet and outlet of the engine; And An electronic control device for controlling the fuel leakage prevention valve to close when the pressure value detected by the pressure sensor for detecting the pressure of the fuel supplied to the pressure regulator is lower than a preset input value, so that the fuel flows out; A fuel leakage prevention device for a gas fuel vehicle, characterized in that it is provided. The apparatus of claim 1, wherein the pressure sensor is installed between the return discharge port of the injector and the pressure regulator. The method of claim 1, wherein the fuel leakage prevention valve is installed in the inlet and outlet side of the engine to block the fuel supplied to the engine side and the fuel returned to the fuel tank side at the time of fuel outflow, characterized in that formed in one piece Fuel outflow prevention device for gas fuel vehicle. The electronic control apparatus according to claim 1, wherein the pressure value detected by the pressure sensor is smaller than the pressure value set to close the valve of the pressure regulator and when a pressure exceeding the pressure set in the pressure regulator occurs. And a warning means for generating a warning signal by the gas fuel vehicle prevention device for fuel leakage. The method of claim 1, wherein the fuel leakage prevention valves are installed at the inlet of the engine and the outlet of the fuel tank so that the fuel supplied to the engine side and the fuel returned to the fuel tank side can be blocked at the same time. And the pressure regulator valve is automatically closed when the valve is closed. According to claim 1, Fuel leakage prevention valves are installed on the inlet and outlet sides of the engine so that the fuel supplied to the engine side and the fuel returned to the fuel tank side when the fuel outflow, the fuel pump motor is set at initial start-up And a fuel leakage preventing device for closing the fuel leakage preventing valve driven by a control signal of the fuel pump and a preset pressure sensor control signal when the fuel cell is driven for a time and is in a normal control state.