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AssigneeRobert Bosch GmbH
InventorsAndrea Krusch, Andreas Gutscher, Siamend Flo, Thorsten Allgeier, Walter Maeurer
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The invention relates to a method for operating a piston pump (10) which is driven by means of a coil (1) of an electromagnet. A piston (2) of the piston pump (10) can be moved in a cylinder (3) for pumping purposes by means of the electromagnet. A voltage (U) is applied to the coil (1) during a switch-on period such that a current flows through the coil (1) and the piston (2) is accelerated, said voltage being applied by means of an actuation device (11). A time curve of an electric state variable (I, U) of the coil (1) is qualitatively detected, and the curve or a curve derived therefrom is analyzed in order to detect an impact of the piston (2) against a stop. The invention further relates to an actuation device and a piston pump.
A method for operating a piston pump (10), which is driven by means of a coil (1) of an electromagnet, wherein, by means of the electromagnet, a piston (2) of the piston pump (10) is moveable in a cylinder (3) for the execution of a pump action,
An actuation device (11) for a piston pump (10) for the conveyance of a fluid, specifically a fuel, having a cylinder (3), a piston (2) and an electromagnet with a coil (1) for the movement of the piston (2) in the cylinder (3), wherein the actuation device (11) is configured to apply, during a switch-in time, a voltage (U) to the coil (1), such that a current flows in the coil (1) and the piston (2) is accelerated, wherein the voltage is applied by means of an actuation device (11), and wherein a time characteristic of an electrical state variable (I, U) of the coil (1) is qualitatively determined, and a characteristic, or a characteristic derived therefrom, is evaluated in order to determine the impact of the piston (2) on a limit stop (8).
Dependencies are inferred from the claim text.