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AssigneeRobert Bosch GmbH
InventorsEberhard Schoeffel, Hans Braun, Fabian Lafrenz, Josef Seidel
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A device (20) is used for measuring the injection quantity of injection nozzles (30). It includes a measuring chamber (22) to which the injection nozzle (30) can be coupled. In addition, a detection device is provided, which detects a state change of the testing fluid (60) in the measuring chamber (22) due to an injection by the injection nozzle (30). In order to be able to measure the injection quantity without wear and in a highly precise manner, the invention provides that the detection device has a capacitor, whose one electrode is comprised of an electrically conductive fluid (62), which is at least partially contained in a volume connected to the measuring chamber (22). The processing unit (58) is connected to the capacitor in such a way that it can detect a change in its capacitance, which is produced by a movement of the electrically conductive fluid (62).
A device for measuring the injection quantity of injection nozzles (30), in particular for motor vehicles and in particular in production testing, which has at least one measuring chamber (22) that is at least partially filled with a testing fluid (60), a coupling device (28) that can couple at least one injection nozzle (30) to the measuring chamber (22) in a pressure-tight manner, a detection device, which detects a state change of the testing fluid (60) in the measuring chamber (22) at least intermittently during an injection by the injection nozzle (30), and a processing unit (58), which, based on the signal from the detection device, determines an injection quantity that corresponds to the state change, characterized in that the detection device has a capacitor, whose one electrode is comprised of an electrically conductive fluid (62), which is at least partially contained in a volume connected to the measuring chamber (22), and the processing unit (58) is connected to the capacitor in such a way that it can detect a change in its capacitance, which is produced by a movement of the electrically conductive fluid (62).
The device according to one of the preceding claims, characterized in that the volume constituted by the electrically conductive fluid (62) is at least partially bounded by a prestressed wall (42), in particular by a pneumatic spring (44).
The device according to one of the preceding claims, characterized in that it has a number of stationary electrodes (1 to 19) that are disposed essentially parallel to one another and connected in parallel.
The device according to one of the preceding claims, characterized in that the volume is essentially circular in cross section.
The device according to one of the preceding claims, characterized in that the stationary electrodes (1 to 19) have a dielectric coating (32) on the outside, which preferably contains Teflon.
The device according to one of the preceding claims, characterized in that the testing fluid is oil (60) and the electrically conductive fluid is water, in particular saline water (62).
The device according to one of the preceding claims, characterized in that the boundary surface (64) of the electrically conductive fluid (62) directly adjoins the testing fluid (60).
The device according to one of the preceding claims, characterized in that it includes a housing (24), which at least partially contains the volume with the electrically conductive fluid (62), and that the housing (24) contains an electrically conductive material, which is electrically connected to the processing unit (58), and the stationary electrode (1 to 19) is insulated in relation to the housing.
A method for measuring the injection quantity of injection nozzles (30), particularly for motor vehicles and particularly in production testing, in which at least one injection nozzle (30) is coupled in a pressure-tight manner to a measuring chamber (22) that is at least partially filled with a testing fluid (60), the state change of the testing fluid (60) due to an injection of the injection nozzle (30) into the measuring chamber (22) is detected, and injection quantity is determined based on the state change, characterized in that a state change of the testing fluid (60) results in a movement of an electrically conductive fluid (62), which in turn constitutes an electrode of a capacitor, and the change in the capacitance of the capacitor is detected, which is produced by a movement of the boundary surface (64) of the electrically conductive fluid (62).
Dependencies are inferred from the claim text.