Mobile machine and method

A method of controlling a hydraulic supply system on a mobile machine having an engine, wherein the hydraulic supply system comprises a pump supply including a pump driven by the engine for supplying a pressurized fluid to at least one consumer carried by the mobile machine, the pump supply being configured to provide a hydro-mechanically defined stand-by pressure differential (M-ΔPst) whenever the pump is being driven by the engine, the mobile machine comprising a control system for the hydraulic supply system, the control system comprising at least one controller configured to:

• receive, from a pressure sensor of a load sensing (LS) system associated with the at least one consumer, a pressure signal indicative of a sensed load sensing pressure (LSP) associated with the at least one consumer;
• and
• generate a pump supply control signal for adjusting a pump supply pressure (PSP) in dependence the LSP;
• wherein, the method comprises using the at least one controller to determine that the engine is running in dependence on at least one condition indicative that the engine RPM exceeds a set speed and to adjust the pump supply to increase the PSP to provide a combined stand-by pressure differential, by setting a hydro-electronically defined stand-by pressure differential (E-ΔPst) in addition to the hydro-mechanically defined stand-by pressure differential (M-ΔPst) in dependence on a determination that the engine is running being made.

A mobile machine having an engine and a hydraulic supply system, wherein the hydraulic supply system comprises a pump supply including a pump driven by the engine for supplying a pressurized fluid to at least one consumer carried by the mobile machine, the pump supply being configured to provide a hydro-mechanically defined stand-by pressure differential (M-ΔPst) whenever the pump is being driven by the engine, the mobile machine comprising a control system for the hydraulic supply system, the control system comprising at least one controller configured to:

• receive, from a pressure sensor of a load sensing (LS) system associated with the at least one consumer, a pressure signal indicative of a sensed load sensing pressure (LSP) associated with the at least one consumer;
• and
• generate a pump supply control signal for adjusting a pump supply pressure (PSP) in dependence on the LSP;
• wherein, the control system is configured to make a determination that the engine is running in dependence on at least one condition indicative that the engine RPM exceeds a set speed and inhibit LS functionality for controlling the PSP in dependence on a sensed LSP associated with the at least one consumer in the absence of a determination that the engine is running being made.

A method of controlling a hydraulic supply system on a mobile machine having an engine, wherein the hydraulic supply system comprises a pump supply including a pump driven by the engine for supplying a pressurized fluid to at least one consumer carried by the mobile machine, the pump supply being configured to provide a hydro-mechanically defined stand-by pressure differential (M-ΔPst) whenever the pump is being driven by the engine, the mobile machine comprising a control system for the hydraulic supply system, the control system comprising at least one controller configured to:

• receive, from a pressure sensor of a load sensing (LS) system associated with the at least one consumer, a pressure signal indicative of a sensed load sensing pressure (LSP) associated with the at least one consumer;
• and
• generate a pump supply control signal for adjusting a pump supply pressure (PSP) in dependence the LSP;
• wherein, the method comprises inhibiting LS functionality for controlling the PSP while the engine is being started, and commencing LS functionality when an engine RPM exceeds a set speed.