Patent ID: 9567989
Date: 2017-02-14
CPC Classifications: F04B

Claim:
1. A method for operating a feed pump operating in a pulsating manner, the method comprising the following steps: providing a feed unit having a feed pump with a feed piston and a drive coil configured to drive the feed piston, and providing the feed unit with a pressure sensor downstream of the feed pump in a feeding direction; a) applying a voltage profile to the drive coil, the voltage profile having an overall duration and a first voltage and starting the voltage profile with an activation interval having an activation voltage, and increasing the activation voltage in relation to the first voltage; b) carrying out a feed stroke of the feed piston in accordance with the voltage profile; c) monitoring a pressure profile in the feeding direction downstream of the feed pump; d) evaluating the pressure profile; adapting at least one of the overall duration or the first voltage in step d); and e) adapting the voltage profile as a function of at least one characteristic property of the pressure profile; determining a first point in time of a pressure peak as a characteristic property of the pressure profile; and adapting at least one of the following variables of the voltage profile as a function of the first point in time: activation voltage.