Patent ID: 7930930

Claim:
A method for measuring the instantaneous flow of an injector for gaseous fuels, the method comprising the steps of: injecting a test gas inside a measuring chamber connected to an external environment in a continuous manner via an outlet having a given first outlet section (σ s ), measuring a pressure of the test gas inside the measuring chamber during at least one injection cycle of the injector, measuring a temperature of the test gas inside the measuring chamber during said injection cycle, and calculating the instantaneous flow of the injector as a function of the measured pressure and temperature values, and being characterized in that it further comprises the step of: calculating the instantaneous flow of the injector using the formula m . in = C 1 ⁢ ⅆ p ⅆ t + C 2 ⁢ p where: {dot over (m)} in is the instantaneous flow of the injector; C 1 is a first factor function of a volume of the measuring chamber and of the measured temperature, calculated using the formula C 1 = V R · k · T where: V is the volume of the measuring chamber, R is the specific constant of the test gas, k is a ratio of the specific heats of the test gas, T is the temperature of the test gas inside the measuring chamber p is the measured pressure, and C 2 is a second factor function of the measured temperature and of the first outlet section (σ s ) calculated using the formula C 2 = σ s ⁢ 1 R · T ⁢ k ⁡ ( 2 k + 1 ) k + 1 k - 1 ⁢ .