Abstract: A measuring body is provided in a fluid path between a pump and a fuel injection valve, a flow amount for which is measured. An inner space of the measuring body is divided into a first and a second fluid chambers by a partitioning wall, wherein the first and second fluid chambers are, respectively, operatively connected to the pump and the fuel injection valve. A movable member (float) is slidably inserted into a through-hole formed in the partitioning wall, so that both ends are respectively exposed to the first and second fluid chambers. When the fuel injection is carried out by the fuel injection valve, the fluid in the second fluid chamber is decreased corresponding to the amount of injected fluid, and thereby the float is moved in a direction from the first to the second fluid chamber. The amount of the injected fluid is measured by detecting the movement of the float.

Abstract: In a dynamic flow rate adjusting method, a press-fitting degree of an adjusting pipe is adjusted to regulate a load applied to a needle by a spring in a direction for closing an injection hole. Thus, a dynamic injection quantity of an injector is adjusted. An injection command signal having one-minute long pulse width is applied to the injector to measure a static flow rate, from which the press-fitting degree is calculated. Thus, the press-fitting degree, in which variation in the static flow rate is taken into consideration, can be calculated. Therefore, variation in the dynamic flow rate of each injector, which is calculated from the press-fitting degree, includes only a dynamic flow rate error, while a static flow rate error is eliminated from the variation in the dynamic flow rate.

Abstract: A measuring body is provided in a fluid path between a pump and a fuel injection valve, a flow amount for which is measured. An inner space of the measuring body is divided into a first and a second fluid chambers by a partitioning wall, wherein the first and second fluid chambers are, respectively, operatively connected to the pump and the fuel injection valve. A movable member (float) is slidably inserted into a through-hole formed in the partitioning wall, so that both ends are respectively exposed to the first and second fluid chambers. When the fuel injection is carried out by the fuel injection valve, the fluid in the second fluid chamber is decreased corresponding to the amount of injected fluid, and thereby the float is moved in a direction from the first to the second fluid chamber. The amount of the injected fluid is measured by detecting the movement of the float.

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: In a dynamic flow rate adjusting method, a press-fitting degree of an adjusting pipe is adjusted to regulate a load applied to a needle by a spring in a direction for closing an injection hole. Thus, a dynamic injection quantity of an injector is adjusted. An injection command signal having one-minute long pulse width is applied to the injector to measure a static flow rate, from which the press-fitting degree is calculated. Thus, the press-fitting degree, in which variation in the static flow rate is taken into consideration, can be calculated. Therefore, variation in the dynamic flow rate of each injector, which is calculated from the press-fitting degree, includes only a dynamic flow rate error, while a static flow rate error is eliminated from the variation in the dynamic flow rate.

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.

Abstract: A liquid injection regulator for use in an injection amount measuring apparatus has seal sections for sealing an injection chamber to be charged with fuel oil and a fuel oil discharge port, respectively, and a control valve having portions thereof which constitute parts of the two seal sections. The control valve departs from the injection chamber to release the two seal sections to thereby discharge the liquid and after completion of the discharge of liquid, returns to the liquid injection chamber while sealing the liquid discharge port to thereby raise pressure in the liquid injection chamber.