Patent ID: 6817233
Filing Date: 2004-11-16
Classification: F02M

Abstract:
An injection-amount measuring unit and fuel injector, the fuel injector including a valve member for performing intermittent fuel-injection by being seated on and then lifted from a valve seat using reciprocating movement and an electric driving member for driving the valve member, the injection-amount measuring unit comprising:a fluid supply device for supplying a fluid to the fuel injector; a fluid supply passage through which a fluid is supplied from the fluid supply device to the fuel injector; a volume enlargement chamber in the fluid supply passage, wherein a passage area of the volume enlargement chamber is larger than that of a fluid inflow passage and that of a fluid outflow passage, wherein a fluid flows from a side of the fluid supply device through the fluid inflow passage, to a side of the fuel injector and into the volume enlargement chamber and through the fluid outflow passage; a flow meter for measuring an amount of the fluid supplied from the fluid supply device and injected from the fuel injector; a force applying member for applying a force to the valve member to provide reciprocating motion of the valve member; an adjusting pipe that contacts the force applying member and adjusts the force applied by the force applying member, wherein the electric driving member generates an attracting force for attracting force for attracting the valve member against the applied force, an electric feed device for adjusting a feed distance of the adjusting pipe; and a control unit for controlling a control current supplied to the electric driving member and the electric feed device.