System for calibration of electrohydraulic pump start current based on engine's output torque signal
AssigneeDanfoss Power Solutions Inc.
InventorsThomas Traeger Hansen, Simon Nielsen
Life of this patent
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Abstract
A system for calibrating an electrohydraulic pump using a micro-controller that has software that may command the engine to a speed value and to uncommand the electrohydraulic pump such that a baseline engine load is defined. The software may also, thereafter, command the electrohydraulic pump to ramp up until the electrohydraulic pump goes into stroke thereby increasing the engine load to an amount over the baseline engine load. When this occurs, the software may define a start current value for that direction of the electrohydraulic pump.
Claims19
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.
A method for calibrating an electrohydraulic pump, comprising:
- providing a machine having a propel system, wherein the propel system has an engine connected to an electrohydraulic pump;
- providing a micro-controller having software in communication with the propel system;
- and
- running a calibration process with the software, comprising:
- (a) commanding the engine to a speed value and uncommanding the electrohydraulic pump;
- (b) defining a baseline engine load;
- (c) storing the baseline engine load in the micro-controller;
- (d) commanding 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;
- and
- (e) defining a start value for that direction of the electrohydraulic pump upon the engine load reaching a configurable amount over the baseline engine load.
Dependencies are inferred from the claim text.