The invention relates to a method for determining the injection rate of an injection valve (1) using a mathematical model which is based on measurement values comprising the stroke (x) of a piston (3) that delimits a measurement chamber (2) during the injection of a test fluid (4) into the measurement chamber (2). The injection rate is corrected on the basis of an additional measurement value. According to the invention, the pressure (p.sub.a) in an adapter volume (5), via which the injection valve (1) is connected to the measurement chamber (2), is used as an additional measurement value for correcting the injection rate. The invention further relates to a device for determining the injection rate of an injection valve.

The invention relates to a method for determining the injection rate of an injection valve (1) using a mathematical model which is based on measurement values comprising the stroke (x) of a piston (3) that delimits a measurement chamber (2) during the injection of a test fluid (4) into the measurement chamber (2). The injection rate is corrected on the basis of an additional measurement value. According to the invention, the pressure (p.sub.a) in an adapter volume (5), via which the injection valve (1) is connected to the measurement chamber (2), is used as an additional measurement value for correcting the injection rate. The invention further relates to a device for determining the injection rate of an injection valve.

A method of determining density of a fluid within a system includes actuating a piston of a hydraulic cylinder at a target velocity. Additionally, the method includes determining differential pressure and volumetric flow rate of the fluid flowing through an orifice under actuation of the piston. The density of the fluid is determined based on the first differential pressure and the volumetric flow rate of the fluid, which is used by the system to regulate a mass flow rate of fluid within the system.

A positive linear displacement flow rate meter includes a first chamber for receiving a substance such as diesel from a fuel injector and applying a substance force to one end of a piston, wherein an opposing force is applied, such as by air pressure, in a second chamber, to the other piston end, and a comparator, for indicating to a control unit to discard invalid piston displacement measurements, until the substance force is substantially equal to the opposing force, allowing accurate flow rate measurement independent of variation in conditions between uses of the meter.

A positive linear displacement flow rate meter includes a first chamber for receiving a substance such as diesel from a fuel injector and applying a substance force to one end of a piston, wherein an opposing force is applied, such as by air pressure, in a second chamber, to the other piston end, and a comparator, for indicating to a control unit to discard invalid piston displacement measurements, until the substance force is substantially equal to the opposing force, allowing accurate flow rate measurement independent of variation in conditions between uses of the meter.

A piston test instrument for calibration and/or gauging of a flow meter and/or for determining a flow rate, wherein the piston test instrument has a tubular housing having an inlet, via which a measured medium is introducible into the housing, and having an outlet, via which the measured medium is dischargeable from the housing, wherein the piston test instrument has a piston arranged in the housing, wherein the piston test instrument has a drive device, which is designed for moving the piston by way of contactless, magnetic force transmission by a drive device.

A piston test instrument for calibration and/or gauging of a flow meter and/or for determining a flow rate, wherein the piston test instrument has a tubular housing having an inlet, via which a measured medium is introducible into the housing, and having an outlet, via which the measured medium is dischargeable from the housing, wherein the piston test instrument has a piston arranged in the housing, wherein the piston test instrument has a drive device, which is designed for moving the piston by way of contactless, magnetic force transmission by a drive device.

A dosing valve is provided for ejecting a liquid from a nozzle outlet channel. The dosing valve has a main body, a valve actuating element movable within the main body, and a valve closure element connected to or actuatable by the valve actuating element. The valve closure element is movable within a dosing chamber between an open position, in which it is lifted off from a nozzle sealing seat, and a closed position, in which it lies against the nozzle sealing seat. For the pneumatic activation of the dosing valve, a switching valve is provided by means of which a working chamber of the dosing valve can be selectively ventilated or charged with a pressurized fluid.

A dosing valve is provided for ejecting a liquid from a nozzle outlet channel. The dosing valve has a main body, a valve actuating element movable within the main body, and a valve closure element connected to or actuatable by the valve actuating element. The valve closure element is movable within a dosing chamber between an open position, in which it is lifted off from a nozzle sealing seat, and a closed position, in which it lies against the nozzle sealing seat. For the pneumatic activation of the dosing valve, a switching valve is provided by means of which a working chamber of the dosing valve can be selectively ventilated or charged with a pressurized fluid.

A flow-rate monitoring system may include a position sensor, a strain gauge, and a computing device for determining a rate of fluid flow through a pump using strain measurements. The strain gauge may determine strain in the chamber. The position sensor may determine the position of a crankshaft coupled to a plunger in the chamber. The computing device may receive signals generated by the strain gauge and the position sensor related to the strain in the chamber and the position of the crankshaft and process the signals to determine a flow rate through the chamber of the pump.