US 12,345,252 B2
System for calibration of electrohydraulic pump start current based on engine's output torque signal
Thomas Traeger Hansen, Nordborg (DK); and Simon Nielsen, Nordborg (DK)
Assigned to Danfoss Power Solutions Inc., Ames, IA (US)
Filed by Danfoss Power Solutions Inc., Ames, IA (US)
Filed on Oct. 21, 2022, as Appl. No. 18/048,703.
Claims priority of provisional application 63/272,996, filed on Oct. 28, 2021.
Prior Publication US 2023/0140728 A1, May 4, 2023
Int. Cl. F04B 49/06 (2006.01); F04B 17/03 (2006.01); F04B 51/00 (2006.01); F15B 11/16 (2006.01)
CPC F04B 49/06 (2013.01) [F04B 17/03 (2013.01); F04B 51/00 (2013.01); F15B 11/161 (2013.01); F04B 2203/0201 (2013.01); F04B 2203/0603 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A system for calibrating an electrohydraulic pump, comprising:
a machine having a propel system;
the propel system having an engine connected to an electrohydraulic pump;
a micro-controller having software in communication with the propel system; and
the software having a calibration process comprising:
the software is configured to command the engine to a speed value and to uncommand the electrohydraulic pump such that a baseline engine load is defined and stored in the micro-controller;
the software, after the baseline engine load is defined, is configured to command the electrohydraulic pump to ramp up from a configurable minimum value at a configured rate until the electrohydraulic pump goes into stroke resulting in an increase in an engine load above the baseline engine load;
the software, after the increase in the engine load reaches a configurable amount over the baseline engine load, is configured to define a start current value for that direction of the electrohydraulic pump.