Abstract: A fluid volume measuring apparatus for measuring volume of fluid flowing out of a measured object includes a passage member that defines a measurement passage. The measurement passage is filled with fluid, which is capable of moving in the measurement passage in accordance with volume of fluid flowing out of the measured object. The fluid filled in the measurement passage forms a bubble. The passage member has a translucent portion in a predetermined measurement range, in which the bubble displaces in accordance with volume of fluid flowing out of the object to be measured. The translucent portion is formed of a translucent material. Volume of fluid, which flows out of the measured object, is measured in accordance with displacement of the bubble.

Abstract: A fluid volume measuring apparatus for measuring volume of fluid flowing out of a measured object includes a passage member that defines a measurement passage. The measurement passage is filled with fluid, which is capable of moving in the measurement passage in accordance with volume of fluid flowing out of the measured object. The fluid filled in the measurement passage forms a bubble. The passage member has a translucent portion in a predetermined measurement range, in which the bubble displaces in accordance with volume of fluid flowing out of the object to be measured. The translucent portion is formed of a translucent material. Volume of fluid, which flows out of the measured object, is measured in accordance with displacement of the bubble.

Abstract: An injection-amount measuring unit, for measuring an injection amount of a fuel injector, employs a flow meter to measure a flow amount of a test fluid supplied from a pump and pumped through a fluid supply passage. A volume enlargement chamber of a volume member, is disposed around an upstream side of a fuel inlet of the fuel injector. A test fluid flows from a side of the pump into the volume enlargement chamber through the fluid inflow passage. The test fluid then flows from the volume enlargement chamber to a side of the fuel injector through the fluid outflow passage. When a needle opens an injection hole, transmitted waves and reflected waves, and resultantly, pressure pulsation, may be generated in the test fluid within the fuel injector. These waves and pulsation are eliminated.

Abstract: An injection-amount measuring unit, for measuring an injection amount of a fuel injector, employs a flow meter to measure a flow amount of a test fluid supplied from a pump and pumped through a fluid supply passage. A volume enlargement chamber of a volume member, is disposed around an upstream side of a fuel inlet of the fuel injector. A test fluid flows from a side of the pump into the volume enlargement chamber through the fluid inflow passage. The test fluid then flows from the volume enlargement chamber to a side of the fuel injector through the fluid outflow passage. When a needle opens an injection hole, transmitted waves and reflected waves, and resultantly, pressure pulsation, may be generated in the test fluid within the fuel injector. These waves and pulsation are eliminated.

Abstract: An adjusting pipe is being inserted into a housing while increasing an electric current frequency for a coil to control a fluid flow amount being constant. Since the electric current frequency is increased while keeping the fluid flow amount constantly, there is no need to wait until the flow amount becomes stable. Since both an insertion amount of the adjusting pipe and the frequency of the electric current supplied into the coil are simultaneously, continuously, and dynamically changed and adjusted, an adjusting time thereof is reduced.