Injection system for an internal combustion engine, and internal combustion engine

1. An injection system for an internal combustion engine, comprising:

a fuel accumulator,

a prefeed pump for feeding fuel from a fuel tank,

a high pressure pump arranged downstream from the prefeed pump for increasing pressure of the fuel and feeding the higher pressure fuel into the fuel accumulator, and

a line which branches off downstream of the prefeed pump and upstream of the high pressure pump and is coupled hydraulically to an exhaust gas section injector, wherein fuel is controllably and directly injected into an exhaust gas section downstream of a combustion chamber and upstream of a particle filter of the internal combustion engine.

2. The injection system according to claim 1 , further comprising at least one injector coupled hydraulically to the fuel accumulator.

3. The injection system according to claim 1 , wherein the prefeed pump is a vane pump.

4. The injection system according to claim 1 , wherein the prefeed pump is coupled hydraulically to a preliminary pressure regulating valve.

5. The injection system according to claim 1 , wherein the high pressure pump is a radial piston pump.

6. The injection system according to claim 1 , wherein the high pressure pump is a serial piston pump with a plurality of cylinder units.

7. The injection system according to claim 1 , wherein the fuel accumulator is coupled hydraulically via lines to a plurality of injectors.

8. The injection system according to claim 1 , wherein a volumetric flow control/regulating valve is arranged between the prefeed pump and the high pressure pump.

9. The injection system according to claim 1 , further comprising a pressure sensor for determining the fuel pressure in the fuel accumulator.

10. The injection system according to claim 1 , wherein the high pressure pump is connected to a pressure-regulating valve by means of a return line which branches off downstream of the high pressure pump and upstream of the fuel accumulator.

11. The injection system according to claim 1 , wherein a flush line branches off downstream of the prefeed pump and upstream of a preliminary pressure regulating valve.

12. An method for injecting fuel within an internal combustion engine, comprising

feeding fuel with a prefeed pump from a fuel tank to a high pressure pump downstream from the prefeed pump,

feeding the fuel with the high pressure pump to a fuel accumulator, and

injecting the fuel controllably and directly into an exhaust gas section downstream of a combustion chamber and upstream of a particle filter of the internal combustion engine with an exhaust gas section injector coupled hydraulically to a line which branches off downstream of the prefeed pump and upstream of the high pressure pump.

13. An internal combustion engine comprising:

at least one cylinder in which a combustion chamber is embodied, into which fuel is injected by at least one injector coupled hydraulically to a fuel accumulator,

a prefeed pump for feeding fuel from a fuel tank,

a high pressure pump arranged downstream from the prefeed pump for increasing pressure of the fuel and feeding the higher pressure fuel into the fuel accumulator, and

a line which branches off downstream of the prefeed pump and upstream of the high pressure pump and is coupled hydraulically to an exhaust gas section injector, wherein fuel is controllably and directly injected into an exhaust gas section downstream of a combustion chamber and upstream of a particle filter of the internal combustion engine, and

wherein the exhaust gas section is coupled hydraulically to the combustion chamber and the exhaust gas section injector is arranged downstream of the combustion chamber and upstream of a particle filter.

14. The internal combustion engine according to claim 13 , further comprising at least one injector coupled hydraulically to the fuel accumulator.