Patent ID: 8511152
Filing Date: 2013-08-20
Classification: F02M,G01F

Abstract:
1. A method for analyzing a step-by-step injection rate provided by a fuel injection system used in a heat engine, the method comprising: injecting fuel into a first constant-volume measuring chamber, measuring a pressure and temperature in the first measuring chamber, at least partially draining said first measuring chamber towards a second measuring chamber, in which the fuel drained from the first measuring chamber is sent, the second measuring chamber having a volume that varies depending on movement of a piston inside this measuring chamber, measuring the movement of the piston in the second measuring chamber, and analyzing the pressure and temperature measurements in the first measuring chamber and movement of the piston, in the second measuring chamber, performing the partial draining of the first measuring chamber in the second measuring chamber until the pressure in the first measuring chamber returns to the pressure measured before the injection, wherein the partial draining of the first measuring chamber into the second measuring chamber after each injection is done in several stages, successively, the second measuring chamber itself being drained each time, and wherein the volume measurements by movement of the piston in the second measuring chamber, for each filling/emptying of said measuring chamber, are added so as to obtain a total volume corresponding to a quantity of fuel delivered by the injector for an injection step.