Abstract: A rate tube measurement system for measuring injected fuel and a method thereof are disclosed. In one embodiment, the system includes a fixture assembly, a rate tube fluidically connected to the fixture assembly to receive fuel injected by the fuel injector during, a pressure sensor positioned upstream of the rate tube that is adapted to measure pressure changes in the injected fuel and provide a pressure output, a flow meter that measures flow of injected fuel and provides a flow output indicative of the measured fuel flow, and a computing device that processes the duration of actuation, the pressure output and the flow output to determine injection information such as fuel injection quantity, variation, and rate shape.

Abstract: A real-time mass flow measurement system that accurately measures fuel mass delivered to each cylinder per stroke of an injection pump or a fuel injector in an internal combustion engine. In accordance with preferred embodiment of the present invention, the mass flow measurement system and method includes a fuel measuring device that measures fuel delivered by one of the plurality of fuel injectors or fuel pumps. The preferred embodiment also includes a fuel transfer circuit for directing fuel flow to the fuel measuring device and a plurality of fuel diverting devices positioned along the fuel transfer circuit for diverting fuel flow from the plurality of fuel injectors or pumps into the fuel transfer circuit and a fuel routing device positioned along the fuel transfer circuit for routing the diverted fuel flow to either the fuel measuring device or a fuel drain.