Patent ID: 8333110

Claim:
A device for analyzing a step-by-step injection rate provided by a fuel injection system used in a heat engine, the device comprising: a first chamber for measuring a constant volume, in which the fuel is injected, a pressure sensor and a temperature sensor being associated with said first measuring chamber for measuring pressure and temperature, respectively, in said first measuring chamber, means for at least partially emptying the first measuring chamber, downstream of the first measuring chamber, a second measuring chamber in which the fuel drained from the first measuring chamber is sent, a volume of the second measuring chamber varying depending on movement of a piston whereof the movement is measured using a movement sensor, an electronic section controlling the device and analyzing information received from the sensors, such that partial draining of the first measuring chamber after injection is done until the pressure in said first measuring chamber is reestablished therein before the injection, wherein at least one additional measuring chamber, a volume of which varies according to the movement of the piston ( 11 a , 11 b , . . . n) whereof the movement is measured using a movement sensor ( 13 a , 13 b , . . . n), is mounted downstream of the first measuring chamber, in parallel with the second measuring chamber, such that the fuel drained from the first measuring chamber is received in the second measuring chamber and/or in the or each additional measuring chamber, the electronic section being provided to measure and add the volumes received, for each injection, by the second measuring chamber and by the additional measuring chamber(s), so as to obtain a total volume corresponding to the amount of fuel delivered for an injection step.