High-pressure fuel injection valve for an internal combustion engine

A high-pressure fuel injection valve for an internal combustion engine connected to a fuel tank, comprising:

• a fuel receiving chamber housing a single control piston having a piston upper side and a piston lower side and a nozzle needle arranged with respect to each other in a longitudinal direction,
• wherein the nozzle needle is arranged on the lower side of the control piston which faces toward a nozzle tip having spray holes and interacts with a needle seat in the nozzle tip,
• the fuel receiving chamber including:
• a closing control chamber located on and in contact with the upper side of the control piston and defined by walls of the fuel receiving chamber and the upper side of the control piston housed within the fuel receiving chamber, the closing control chamber hydraulically connected to the fuel tank by a fuel high-pressure port via a first fuel feed throttle and to the fuel tank by a fuel low-pressure port via a first fuel return throttle to return fuel to the fuel tank,
• an opening control chamber located on and in contact with the lower side of the control piston and defined by walls of the fuel receiving chamber and the lower side of the control piston housed within the fuel receiving chamber, the opening control chamber hydraulically connected to the fuel tank by a fuel high-pressure port via a second fuel feed throttle and to the fuel tank by a fuel low-pressure port via a second fuel return throttle to return fuel to the fuel tank, and
• wherein the first fuel return throttle has a larger throttle aperture and a greater fuel throughflow value than the second fuel return throttle such that when a control valve is open, pressure falls more quickly in the closing control chamber than in the opening control chamber until a resultant force on the control piston opens the high-pressure fuel injection valve, and
• wherein the first fuel feed throttle has a larger throttle aperture and a greater fuel throughflow value than the second fuel feed throttle, such that when the control valve is closed pressure builds up more quickly in the closing control chamber than in the opening control chamber until a resultant force on the control piston closes the high-pressure fuel injection valve.