Robert Boschgmbh

Clemens Majer

Thomas Fischer

Stefan Muelders

Iris Hartung

Markus Boerner

Wolfgang Sander

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

Method and device for determining the injection rate of an injection valve

A device () for measuring the injection rate dm(t)/dt of an injection valve () for a fluid (), wherein m(t) is the injection quantity of the fluid () as a function of the time (t), having a measurement volume () which is closed off on all sides and which is filled with a test fluid (), having an opening () in one wall () of the measurement volume () for the purposes of receiving the injection valve () such that the injection valve (), in the installed position, projects with at least one injection opening () into the measurement volume (), and having a pressure sensor () which is arranged in the measurement volume (), wherein correction means () are provided for determining the propagation time of a pressure wave (), which originates from the injection opening () and which propagates through the test fluid (), to the pressure sensor () and for correcting the measured injection rate dm(t)/dt, taking said propagation time into consideration, to give a rectified injection rate dm'(t)/dt. A method for producing the device (), wherein the characteristic map () is determined by way of a fluid-dynamic simulation of the time-dependent and position-dependent local speed of sound c(t,x) in a partial volume of the measurement volume () which encompasses at least the path () from the injection opening () to the pressure sensor (), which simulation is based on at least one time-dependent boundary condition for the pressure (p) in the measurement volume () and/or for the injection quantity (dm). A method for measuring the injection rate dm(t)/dt of an injection valve () for a fluid ().

Device for measuring the injection rate, method for producing a device of said type, and measuring method

The invention relates to a device for determining the mass of fluid () discharged by an injector (), the device comprising a housing () which is impermeable to fluid and which serves for storing fluid, said housing having an injector port () for the connection, in particular of an inlet (), of the injector () and having a fluid port () for the infeed of fluid (), wherein at least one pressure sensor () for pressure measurement is provided in the housing () in order, by way of an evaluation unit (), to determine the mass of the fluid () in the housing () in a manner dependent on the determined pressure.

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Ingersheim, Germany

Clemens Majer