Patent ID: 7637252

Claim:
A common rail injection system for an internal combustion engine having at least one combustion chamber, comprising: a high pressure fuel pump for supplying fuel, a high pressure fuel accumulator connected to the high pressure fuel pump for storing injection-pressurized fuel in relation to the environment of the common rail injection system, an injector connected to the high pressure fuel accumulator for delivering fuel into the at least one combustion chamber, a throttle valve, a return line for returning fuel from the injector to the high pressure fuel pump said returning fuel being pressurized by a return line pressure in relation to the environment of the common rail injection system, a buffer store arranged in the return line, an adjusting means for adjusting the return line pressure and the buffer store pressure, and a direct connecting line, connecting the high pressure fuel accumulator and the buffer store, wherein the throttle valve is arranged in the direct connecting line between the high pressure fuel accumulator and the buffer store.