Abstract: An apparatus for ultrasonically measuring the flow rate of a fluid in a measuring channel including fluid supply passages at its ends, this measuring channel forming a waveguide made into a solid body, comprising at each end a transducer capable of emitting or receiving ultrasounds circulating in the axis of the channel, where each transducer includes a shell transmitting the ultrasounds, comprising a waveguide facing the measuring channel, and outside this waveguide shapes orientating the ultrasounds in directions different from that of the channel.

Abstract: A control method for an apparatus for ultrasonically measuring the flow rate of a fluid in a measuring channel, including a measuring channel whose one end is equipped with a first transducer and the other end is equipped with a second transducer, each transducer emitting ultrasonic waves to the other transducer, and receiving waves generated by the other transducer, where, in a first step, the first transducer emits waves to the second transducer, and in a second step, which can be simultaneous with the first one, the second transducer emits waves prior to the reception of the waves emitted by the first transducer.

Abstract: The method of the invention includes the injection of fuel in a first constant-volume measuring chamber (3) in which the pressure (P) and the temperature (T) are measured, and the partial draining of said first chamber into a second variable-volume measuring chamber (8) based on the movement of a piston (11), said movement being measured, wherein the partial draining of the first chamber into the second chamber after an injection is carried out until the pressure (Po) existing in the first chamber before the injection is recovered. The draining of the first chamber into the second after each injection is carried out several times consecutively, and the second chamber itself is drained each time. The volumetric measures made by moving the piston (11) for each filling/draining of the second chamber are added in order to obtain a total volume. The method is useful for high injection rates.

Abstract: The invention relates to a device that includes: a first chamber (3) for measuring a constant volume, and in which the fuel is injected; pressure (5a, 5b) and temperature (6) sensors associated with said first chamber (3); and a second measuring chamber (8) located downstream from the first, into which the fuel drained from the first chamber is sent. The volume of the second chamber (8) varies according to the movement of a piston (11), the movement of which is measured by means of a sensor (13). One or more additional measuring chambers (8a, 8b, . . . 8n) of variable volumes are connected in parallel with the second chamber (8) and also receive the fuel drained from the first chamber (3), the volumes received in said different chambers being added up to obtain the total volume supplied for a single injection step. The device can be used for high injection rates.

Abstract: The invention relates to a device that includes: a first chamber (3) for measuring a constant volume, and in which the fuel is injected; pressure (5a, 5b) and temperature (6) sensors associated with said first chamber (3); and a second measuring chamber (8) located downstream from the first, into which the fuel drained from the first chamber is sent. The volume of the second chamber (8) varies according to the movement of a piston (11), the movement of which is measured by means of a sensor (13). One or more additional measuring chambers (8a, 8b, . . . 8n) of variable volumes are connected in parallel with the second chamber (8) and also receive the fuel drained from the first chamber (3), the volumes received in said different chambers being added up to obtain the total volume supplied for a single injection step. The device can be used for high injection rates.

Abstract: The method of the invention includes the injection of fuel in a first constant-volume measuring chamber (3) in which the pressure (P) and the temperature (T) are measured, and the partial draining of said first chamber into a second variable-volume measuring chamber (8) based on the movement of a piston (11), said movement being measured, wherein the partial draining of the first chamber into the second chamber after an injection is carried out until the pressure (Po) existing in the first chamber before the injection is recovered. The draining of the first chamber into the second after each injection is carried out several times consecutively, and the second chamber itself is drained each time. The volumetric measures made by moving the piston (11) for each filling/draining of the second chamber are added in order to obtain a total volume. The method is useful for high injection rates.

Abstract: The measuring device includes a first measuring chamber (8) into which fuel is injected, pressure sensor (62) and a temperature sensor (60) respectively measuring pressure and temperature in the first measuring chamber (8), devices enabling the measuring chamber to be at least partially drained, an electronic section controlling the system and analyzing information received from the sensors (46, 60, 62). The device also includes a second measuring chamber (20) arranged downstream from the first measuring chamber (8). Fuel which is drained from the first measuring chamber (8) is sent to said second chamber. The volume of the second measuring chamber (20) can vary according to the displacement of a piston (38). The displacement is measured with the aid of a displacement sensor (46).