Method for controlling the feed rate of a feed pump

Abstract

A method for controlling the feed rate of a feed pump, including a drive part having a drive motor and a hydraulic part having an intake opening, a discharge opening and a feed mechanism situated in between, a setpoint feed rate being predefined and the feed pump being triggered based on the setpoint feed rate, the temperature of the fluid and a pressure difference between the intake opening and the discharge opening of the hydraulic part of the feed pump.

1 . A method for controlling a feed rate of a feed pump, including a drive part having a drive motor and a hydraulic part having an intake opening, a discharge opening and a feed mechanism situated in between, comprising:
 specifying a setpoint feed rate; and   triggering the feed pump based on the setpoint feed rate, a temperature of the fluid, and a pressure difference between the intake opening and the discharge opening of the hydraulic part of the feed pump.   
     
     
         2 . The method according to  claim 1 , further comprising determining the pressure difference based on a drive torque of the drive motor. 
     
     
         3 . The method according to  claim 2 , further comprising determining the drive torque based on a motor current flowing through the drive motor. 
     
     
         4 . The method according to  claim 3 , further comprising determining at least one of (a) an actual feed rate and (b) a setpoint rotational speed using characteristic map based on the temperature and the motor current. 
     
     
         5 . The method according to  claim 1 , further comprising determining the pressure difference based on a viscosity and the temperature of the fluid. 
     
     
         6 . The method according to  claim 1 , further comprising determining the pressure difference taking into account a temperature-dependent leakage. 
     
     
         7 . The method according to  claim 1 , further comprising triggering a setpoint rotational speed of the drive motor. 
     
     
         8 . The method according to  claim 1 , wherein the feed pump is arranged as a pump of an integrated configuration, in which the drive part and the hydraulic part form an inseparable unit. 
     
     
         9 . The method according to  claim 8 , further comprising determining the temperature by measuring in an electronic part of the feed pump. 
     
     
         10 . The method according to  claim 9 , further comprising determining a motor current in a power module of the electronic part. 
     
     
         11 . A computation unit configured to perform a method for controlling a feed rate of a feed pump, including a drive part having a drive motor and a hydraulic part having an intake opening, a discharge opening and a feed mechanism situated in between, the method including:
 specifying a setpoint feed rate; and   triggering the feed pump based on the setpoint feed rate, a temperature of the fluid, and a pressure difference between the intake opening and the discharge opening of the hydraulic part of the feed pump.