A method for controlling a high-pressure pump for the injection of fuel into a combustion engine, the high-pressure pump being connected to a camshaft of the combustion engine, wherein the high-pressure pump is controlled in a camshaft-synchronous manner by ascertaining an angular offset between the flank positions of a camshaft pulse-generating wheel and a predefinable point above the bottom dead center of a cam of the high-pressure pump on the camshaft.

The subject matter of this specification can be embodied in, among other things, a fluid control device that includes a housing defining a plunger cavity in fluid communication with a fluid inlet and a fluid outlet, a valve having a shaft having a first end and a second end, and a stopper at the first end configured to block a fluid circuit between the fluid inlet and the fluid outlet in a first configuration of the inlet control valve and connect the fluid circuit in a second configuration of the inlet control valve, and a plunger configured for axial movement within the plunger cavity, defining a shaft cavity having an inner wall extending from an enclosed end to an open end in fluid communication with the fluid outlet, and configured to accommodate axial movement of the shaft within the shaft cavity.

A pump unit has an inlet valve, an outlet valve, a supply line for supplying fuel, a pumping chamber, and a plunger for pressurizing fuel in the pumping chamber. The inlet valve includes an inlet valve member movable between a first position and a second position. The inlet valve member has an aperture formed therein. The aperture provides a first fluid pathway between the pumping chamber and the supply line when the inlet valve member is in its first position, and the aperture provides a second fluid pathway between the pumping chamber and the outlet valve when the inlet valve member is in its second position.

A fuel system including a high pressure fuel pump with a quite fuel metering valve is disclosed. In one example, the quite fuel metering valve may be driven via a rotating motor. The fuel system may reduce engine noise and may provide improved fuel pressure control.