| 摘要 |
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.
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