Patent ID: 7171847

Claim:
A method for measuring the injection rate of an injection valve for liquids, preferably for liquid fuel, in which the injection valve ( 3 ) injects the liquid into a liquid-filled measurement volume ( 1 ), the measurement volume ( 1 ) being closed off on all sides and a pressure sensor ( 20 ) being located in the measurement volume ( 1 ), the method comprising the steps of: injecting liquid by the injection valve ( 3 ) into the measurement volume ( 1 ); measuring the pressure (p(t)) in the measurement volume ( 1 ) by means of the pressure sensor ( 20 ) during the injection, and recording of these measured values; determining the speed of sound (c) in the measurement volume ( 1 ); and determining the injected test liquid quantity (m(t); Î”m) from the measured pressure values (p(t)) and the speed of sound (c).