Patent ID: 6755076
Filing Date: 2004-06-29
Classification: F02M

Abstract:
A device for measuring a quantity of fuel injected by an injector (2) used in a combustion engine including;a first measuring chamber (8) into which the fuel is injected, a pressure sensor (62) respectively measuring the pressure in the first measuring chamber (8), a temperature sensor (60) measuring the temperature in the first measuring chamber (8), downstream of the first chamber (8), a second measuring chamber (20) which is connected to the first chamber (8) by a drain pipe (18) and the volume of which can vary according to the movement of a piston (38), the displacement of which is measured using a displacement sensor (46), means for draining the first measuring chamber (8) at least partially, means for draining the second measuring chamber (20) at least partially, an electronic section analyzing information received through the sensors (46, 60, 62) and controlling the draining means of the first chamber (8) and the second chamber (20) in particular, characterized in that: the means of draining the first chamber (8) into the second chamber (20) includes a high-speed valve (32), the means of draining the second chamber (20) includes a high-speed valve (52), the electronic section is designed to control the means of draining the first chamber (8) and the second chamber (20) so as, on the one hand, to partially drain the first measuring chamber (8) after each injection until the pressure in the first measuring chamber (8) after each injection until the pressure in the first measuring chamber returns to essentially the pressure that was in this chamber prior to this injection and, on the other hand, to partly drain the second chamber (20) after each measurement of the volume of each injection.