초록 ▼

The invention relates to a fuel supply system (1) for injecting liquefied vapor under high pressure, such as liquid petroleum gas (LPG), into a combustion chamber (3-6) of an internal combustion engine (2). The fuel supply system (1) comprises a fuel supply for liquefied vapor connected to a high-pr

The invention relates to a fuel supply system (1) for injecting liquefied vapor under high pressure, such as liquid petroleum gas (LPG), into a combustion chamber (3-6) of an internal combustion engine (2). The fuel supply system (1) comprises a fuel supply for liquefied vapor connected to a high-pressure pump (11) via a duct. The high-pressure pump (11) has a high-pressure chamber (105) which is embodied thereby to increase the pressure of the liquefied vapor. A high-pressure discharge of the high-pressure pump (11) is connected to a high-pressure rail (7) which comprises one or several injectors for injecting liquefied vapor into a combustion chamber. According to the invention, the fuel supply system is provided with a discharge F unit (20) for purging fuel, in particular fuel vapor, between the high-pressure chamber and the combustion chamber.

대표청구항 ▼

1. A fuel supply system for injecting liquefied vapour under high pressure into a combustion chamber of an combustion engine, comprising a fuel supply for liquefied vapour, a first low-pressure connected to a second high-pressure pump via a conduit, wherein the second high-pressure pump comprises a

1. A fuel supply system for injecting liquefied vapour under high pressure into a combustion chamber of an combustion engine, comprising a fuel supply for liquefied vapour, a first low-pressure connected to a second high-pressure pump via a conduit, wherein the second high-pressure pump comprises a high-pressure chamber which is embodied to thereby increase the pressure of the liquefied vapour, and wherein a high-pressure discharge of the second high-pressure pump is connected to a high-pressure rail which comprises one or several injectors for injecting liquefied vapour into a combustion chamber, wherein the fuel supply system is provided with a discharge unit for discharging vaporous fuel between the high-pressure chamber and the combustion chamber, wherein the fuel supply system is configured to discharge vaporous fuel from the discharge unit, wherein the second high-pressure pump has a first internal discharge connected to a low-pressure part of the second high-pressure pump and a second discharge downstream of the second high-pressure pump ,and wherein a short-circuit line comprising a controllable valve and a pump connects the first internal discharge and second discharge of the second high-pressure pump with the inlet of the second high-pressure pump. 2. A fuel supply system according to claim 1, wherein the discharge unit is at least connected to discharge fuel vapour from those parts of the fuel supply system positioned downstream of the second high-pressure pump in a non-fuel-consuming state of the internal combustion engine. 3. A fuel supply system according to claim 1, wherein the discharge unit is connected to discharge fuel from the high-pressure chamber of the second high-pressure pump. 4. A fuel supply system according to claim 1, wherein the discharge unit comprises a discharge line which is connected to the return line to the fuel supply. 5. A fuel supply system according to claim 1, wherein the discharge unit has a controllable valve, and is connected in particular to set the flow resistance of the discharge unit in a controllable manner. 6. A fuel supply system according to claim 1, comprising a non-return valve which is connected downstream of the high-pressure chamber and is connected to a control unit for thereby actuating said non-return valve, and in which the discharge unit is connected downstream of the non-return valve. 7. A fuel supply system according to claim 1, wherein the second high-pressure pump has a non-return valve downstream of the high-pressure chamber, and in which the discharge unit is connected to a duct which is positioned in the second high-pressure pump and upstream of the non-return valve. 8. A fuel supply system according to claim 1, wherein the second high-pressure pump, upstream of the high-pressure chamber, has a leakage line which is connected to the fuel supply. 9. A fuel supply system according to claim 8, wherein the leakage line is connected to the fuel supply via a return line. 10. A fuel supply system according to claim 9, wherein a return line of the fuel supply is connected to the discharge unit and the leakage line via a controllable valve. 11. A fuel supply according to claim 10, wherein the controllable valve is embodied to prevent flow from the low-pressure part to the fuel supply, as well as to allow flow through the discharge line to the fuel supply. 12. A fuel supply according to claim 10, wherein the controllable valve is embodied to allow flow from the low-pressure part to the fuel supply, as well as to prevent flow through the discharge line to the fuel supply. 13. A fuel supply system according to claim 1, wherein the fuel supply system comprises leak opening which is connected to the high-pressure chamber for generating a continuous flow of liquid vapour through the high-pressure chamber during operation of the internal combustion engine. 14. A fuel supply system according to claim 1, wherein the fuel supply system comprises a second fuel supply and wherein a control unit can switch between the supplies of the first fuel and the second fuel to an inlet of the second high-pressure pump. 15. A fuel supply system according to claim 1, wherein, downstream of the discharge unit for discharging vaporous fuel, in the high-pressure discharge or high-pressure rail, a non-return valve is fitted which maintains the pressure in the high-pressure rail. 16. A vehicle comprising an combustion engine and an associated fuel supply system according to claim 5, comprising a control unit for said controllable valve. 17. A vehicle according to claim 16, in which the control unit is embodied to open said valve during the start-up phase of said internal combustion engine. 18. A vehicle according to claim 17, comprising a door with an opening sensor, in which said start-up phase comprises said sensor emitting a signal. 19. A fuel supply system according to claim 1, wherein the first internal discharge and the second discharge are connected to a three/two controllable valve.