KR20000042267A - Device for compensating pressure of fuel for lpg vehicle - Google Patents

Abstract

PURPOSE: A compensator of fuel pressure for an LPG(Liquefied Petroleum Gas) vehicle is provided to quickly supply a fuel into a vaporizer when the LPG vehicle is rapidly accelerated by installing a surge tank between a solenoid valve and the vaporizer. CONSTITUTION: A LPG fuel of gaseous or liquid phase ventilated from a bombe(22) is flowed in a solenoid valve(16) through fuel pipes(18,20), the solenoid valve(16) flows the gaseous fuel or the liquid phased fuel into a surge tank(40) by sorting according to a driving condition of an engine. The LPG fuel flowed inside the surge tank(40) is flowed in a vaporizer(12) by a negative pressure of the vaporizer(12). The LPG fuel is evaporated by flowing in the vaporizer during filtering impurities with a filter(50) through a ventilating pipe(48). The evaporated fuel inside the vaporizer(12) is formed a mixed gas by mixing with an outer air with passing to a sucking pipe(6) between an air cleaner(8) and a throttle valve(4). And the fuel is burned by sucking into a combustor of the engine with passing a throttle valve(4).

Description

Fuel Pressure Compensation Device of LPI Vehicle

The present invention relates to a fuel pressure compensating device for an LLP vehicle, and more particularly, to install a surge tank between a solenoid valve and a vaporizer to supply fuel to the vaporizer quickly when the LPG vehicle is rapidly accelerated. It relates to a compensation device.

As is well known, the internal combustion engine of an LPG vehicle burns a mixer sucked into a combustion chamber, and linearly reciprocates the piston with the explosive force generated therein, and converts its linear reciprocating motion into a rotational motion as a crank mechanism to obtain rotational power. For example, the engine of a vehicle is mainly representative.

Such internal combustion engines include gasoline engines, diesel engines, and LPG engines, depending on the fuel used. For example, the LPG engines are generally used in commercial vehicles.

The LPG engine liquefies and stores LPG fuel at a predetermined pressure in a cylinder, which is a fuel tank, and vaporizes the engine during operation of the engine to be supplied to the combustion chamber together with air.

That is, LPG fuel is stored in the liquid phase and vaporized in the evaporator. Since the LPG fuel deprives much heat from the surroundings during vaporization, the latent heat of evaporation required for fuel vaporization is circulated by circulating the cooling water heated by the operation of the engine in the middle stage. Will be supplied.

The system of such an LPG vehicle will be described with reference to the accompanying drawings.

1 is a diagram illustrating a system of a general LPG vehicle.

As shown, the cylinder 22, a fuel tank for storing LPG fuel, is provided with a plurality of fuel pipes (18, 20).

The fuel pipes 18 and 20 are formed of a gaseous fuel pipe 18 and a liquid fuel pipe 20, and the gaseous and liquid fuel pipes 18 and 20 are connected to the vaporizer 12.

The solenoid valve 16 is provided at one side of the fuel pipes 18 and 20 where the fuel pipes 18 and 20 are combined into one supply pipe 14.

The solenoid valve 16 cuts off the flow path of the liquid fuel pipe 20 when the coolant of the engine is low temperature so that the vaporized LPG fuel in the cylinder 22 is supplied to the engine. The flow path of (18) is cut off so that the liquid LPG fuel is supplied to the engine to obtain good running performance.

In addition, the LPG fuel passing through the solenoid valve 16 is sucked into the vaporizer 12 through the supply pipe 14, and the vaporizer 12 vaporizes the LPG fuel under reduced pressure to supply the vaporized fuel to the fuel supply pipe. Through (10) is allowed to enter the intake pipe (6).

The intake pipe (6) is a mixture of the outside air introduced through the air cleaner (8) and vaporized LPG fuel, which is passed through the throttle valve (4) by the negative pressure of the engine (2) to the engine (2) Is inhaled.

Accordingly, the LPG fuel is burned in the combustion chamber of the engine 2, and the combustion gas after the combustion is discharged to the atmosphere through the exhaust pipe.

Here, reference numeral 30 denotes an ECU.

However, in the fuel supply system of the conventional LPI vehicle, the LPG fuel discharged from the cylinder 22 at the rapid acceleration and introduced into the vaporizer 12 through the solenoid valve 16 is vaporized from the cylinder 22 to the vaporizer 12. Since the pipelines of the fuel pipes 18 and 20 are long, the supply pressure of the fuel flowing into the vaporizer 12 is lowered, so that the fuel supply is not smoothly performed. Since the supply pressure is formed to be significantly low, the fuel supply is not smoothly performed due to the low fuel pressure, and thus the primary chamber pressure of the vaporizer 12 is lowered, thereby temporarily outputting the vehicle and There was a problem that a sag (sag) occurs that is a phenomenon that the speed is reduced.

Accordingly, the present invention has been made to solve the above problems of the prior art, to improve the fuel responsiveness by allowing the fuel to flow into the primary chamber of the vaporizer at the low temperature, especially during the acceleration of the vehicle at low temperature, Accordingly, an object of the present invention is to provide a fuel pressure compensating device for an LPI vehicle, which solves a sag which is a phenomenon in which the output and speed of the vehicle are temporarily reduced during rapid acceleration.

Technical configuration of the present invention for achieving the above object is a surge tank for compensating the supply pressure of the fuel between the solenoid valve and the vaporizer; An inlet pipe connected to one side of the surge tank and connected to the solenoid valve; A return pipe connected to the upper end of the surge tank spaced apart from the inlet pipe and connected to the cylinder; A check valve on one side of the return pipe to prevent a back flow of fuel from the surge tank to the bombe side; A discharge pipe installed at one side of the lower end of the surge tank and connected to the vaporizer; And a filter installed to filter foreign substances in the fuel inside the discharge pipe.

1 is a block diagram showing a system of a typical LPG vehicle

Figure 2 is a perspective view of a surge tank according to the present invention

3 is a configuration diagram equipped with a surge tank according to the present invention

Explanation of symbols on the main parts of the drawings

2: engine 4: throttle valve

6: intake pipe 8: air cleaner

10: fuel supply pipe 12: vaporizer

14: Supply Pipe 16: Solenoid Valve

18: gaseous fuel pipe 20: liquid fuel pipe

22: Bomb 40: Surge tank

42: return pipe 44: check valve

46: inlet pipe 48: discharge pipe

50: filter

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

2 is a perspective view illustrating a surge tank according to the present invention, and FIG. 3 is a configuration diagram in which the surge tank according to the present invention is mounted.

As shown, the gaseous or liquid LPG fuel discharged from the cylinder 22 is selectively vaporized by the solenoid valve 16 through the fuel pipes 18 and 20 according to the operating conditions of the engine 2. In the fuel system of the LPG vehicle into which the vaporized LPG fuel is introduced into the intake pipe (6), the gas supply pressure is compensated to compensate the supply pressure of the fuel between the solenoid valve (16) and the vaporizer (12). The master installs the surge tank 40.

The surge tank 40 is connected to the solenoid valve 16 on one side thereof is formed with an inlet pipe 46 communicated so that LPG fuel in the gas phase and liquid phase.

A return pipe 42 connected to the cylinder 22 and connected to the upper end of the surge tank 40 opposite to the inflow pipe 46 is installed.

Inside the return pipe 42, a check valve 44 is provided to prevent fuel from flowing back from the cylinder 22 to the return pipe 42. The check valve 44 has a pressure in the surge tank 40. When it is formed larger than the pressure in the cylinder 22, the gaseous LPG fuel in the surge tank 40 flows into the cylinder 22 and flows in.

In addition, a discharge pipe 48 connected to the vaporizer 12 is formed at the lower end of the surge tank 40 spaced apart from the return pipe 42.

LPG fuel in the gas phase or liquid phase is introduced into the vaporizer 12 through the discharge pipe 48.

Inside the discharge pipe 48 is provided with a filter 50 for filtering foreign matter in the gas phase or liquid LPG fuel.

The surge tank 40 according to the present invention made as described above is the solenoid valve 16 when the gaseous or liquid LPG fuel discharged from the cylinder 22 is introduced into the solenoid valve 16 through the fuel pipes 18 and 20. ) Selects gaseous fuel and liquid fuel into the surge tank 40 according to the operating conditions of the engine 2, and LPG fuel introduced into the surge tank 40 is vaporized by the negative pressure of the vaporizer 12. 12) side, LPG fuel is introduced into the vaporizer (12) while the foreign matter is filtered by the filter 50 through the discharge pipe 48 provided on one side lower end of the surge tank 40 is completely vaporized. .

In this way, the vaporized fuel in the vaporizer 12 is sent to the intake pipe 6 between the air cleaner 8 and the throttle valve 4, mixed with the outside air, and passed through the throttle valve 4 to form the mixer. ) Is sucked into the combustion chamber and burned.

In addition, when the pressure in the surge tank 40 is greater than the pressure of the cylinder 22, LPG fuel passing through the solenoid valve 16 through the fuel pipes 18, 20 flows into the surge tank 40 at this time. Since it is not possible, at this time, the check valve 44 provided in the return pipe 42 of one side of the surge tank 40 is opened to allow the gaseous fuel in the surge tank 40 to flow into the cylinder 22.

Therefore, when the fuel introduced into the surge tank 40 is introduced into the vaporizer 12 as described above, LPG fuel of gaseous or liquid phase always remains in the surge tank 40, and thus the surge tank 40 ), The length of the discharge pipe 48 between the vaporizer 12 and the vaporizer 12 is short, so that fuel can be supplied quickly and smoothly to the vaporizer 12 to solve the sag generated by the long pipe during low temperature or rapid acceleration. It becomes possible.

As described above, the fuel pressure compensator of the LPI vehicle of the present invention is such that fuel is rapidly introduced into the primary compartment of the vaporizer during low temperature or vehicle acceleration at low temperature by a surge tank installed between the solenoid valve and the vaporizer. As a result, the fuel responsiveness is improved, and the sag generated during rapid acceleration is eliminated.

Claims (1)

The gaseous or liquid LPG fuel discharged from the cylinder 22 is selectively introduced into the vaporizer 12 by the solenoid valve 16 according to the operating conditions of the engine 2 and vaporized under reduced pressure, and the vaporized LPG fuel is In the fuel system of the LPG vehicle flowing into the intake pipe (6), A surge tank 40 which compensates the supply pressure of fuel between the solenoid valve 16 and the vaporizer 12; An inlet pipe 46 connected to the solenoid valve 16 on one side of the surge tank 40 to communicate with the surge tank 40; A return pipe 42 connected to the cylinder 22 at an upper end side of the surge tank 40 spaced apart from the inflow pipe 46; A check valve 44 provided at one side of the return pipe 42 to prevent a back flow of fuel from the surge tank 40 to the cylinder 22 side; A discharge pipe 48 installed at one side of the lower end of the surge tank 40 and connected to the vaporizer 12; And a filter (50) installed to filter foreign matters in the fuel inside the discharge pipe (48).