Hydraulic system with a switch valve block for a hydraulically actuatable working machine

A hydraulic system for a hydraulically actuable work machine comprising a switching valve block having

• a plurality of valve block inputs for a respective connection to a pressure output of one or more hydraulic fluid pumps;
• a plurality of valve block outputs for outputting a pressurized hydraulic fluid;
• at least one valve arranged between valve block inputs and valve block outputs and adapted to selectively produce a fluid connection between a first valve block input and a first valve block output or between the first valve block input and a second valve block output;
• a plurality of pressure sources, of which each one is connected to a respective valve block input;
• and
• a plurality of hydraulic consumers of which each one is connected to a respective valve block output, wherein
• the first valve block output has a fixed fluid connection to a second valve block input;
• steering is connected to the first valve block output;
• the plurality of pressure sources are provided by at least two hydraulic fluid pumps that each have at least one pressure output;
• each of the at least two hydraulic fluid pumps have their own control unit;
• and
• the separate control units of the at least two hydraulic fluid pumps are connected to one another to, on a defect event of the pressure source connected to the second valve block input and represents the fixed and non-switchable fluid connection to the steering, switch the valve independently of other control demands to the first valve block output to continue to ensure a fluid supply for the steering.

A hydraulic system for a hydraulically actuable work machine comprising a switching valve block having

• a plurality of valve block inputs for a respective connection to a pressure output of one or more hydraulic fluid pumps;
• a plurality of valve block outputs for outputting a pressurized hydraulic fluid;
• at least one valve arranged between valve block inputs and valve block outputs and adapted to selectively produce a fluid connection between a first valve block input and a first valve block output or between the first valve block input and a second valve block output;
• a plurality of pressure sources, of which each one is connected to a respective valve block input;
• and
• a plurality of hydraulic consumers of which each one is connected to a respective valve block output, wherein
• the first valve block output has a fixed fluid connection to a second valve block input;
• steering is connected to the first valve block output;
• the plurality of pressure sources are provided by at least two hydraulic fluid pumps that each have at least one pressure output;
• each of the at least two hydraulic fluid pumps have their own control unit;
• and
• a sensor for sensing the load pressure is connected downstream of the first valve block output, which sensor is connected to the control units of the at least two hydraulic fluid pumps.

A hydraulic system for a hydraulically actuable work machine comprising a switching valve block having

• a plurality of valve block inputs for a respective connection to a pressure output of one or more hydraulic fluid pumps;
• a plurality of valve block outputs for outputting a pressurized hydraulic fluid;
• at least one valve arranged between valve block inputs and valve block outputs and adapted to selectively produce a fluid connection between a first valve block input and a first valve block output or between the first valve block input and a second valve block output;
• a plurality of pressure sources, of which each one is connected to a respective valve block input;
• and
• a plurality of hydraulic consumers of which each one is connected to a respective valve block output, wherein
• the first valve block output has a fixed fluid connection to a second valve block input;
• steering is connected to the first valve block output;
• the plurality of pressure sources are provided by at least two hydraulic fluid pumps that each have at least one pressure output;
• each of the at least two hydraulic fluid pumps have their own control unit;
• a sensor is present at every pressure output of an associated hydraulic fluid pump to determine the pressure that is applied, said sensor being connected to the associated control unit of the at least two hydraulic fluid pumps so that they are able to detect an error event in dependence on the pressure applied;
• a check valve is provided at each pressure output of the at least two hydraulic pumps;
• and
• the control units are adapted to monitor functionality of the sensors at the pressure output in that a value of the sensor is used for the sensing of the steering supply pressure.

A hydraulic system for a hydraulically actuable work machine comprising a switching valve block having

• a plurality of valve block inputs for a respective connection to a pressure output of one or more hydraulic fluid pumps;
• a plurality of valve block outputs for outputting a pressurized hydraulic fluid;
• at least one valve arranged between valve block inputs and valve block outputs and adapted to selectively produce a fluid connection between a first valve block input and a first valve block output or between the first valve block input and a second valve block output;
• a plurality of pressure sources, of which each one is connected to a respective valve block input;
• and
• a plurality of hydraulic consumers of which each one is connected to a respective valve block output, wherein
• the first valve block output has a fixed fluid connection to a second valve block input;
• steering is connected to the first valve block output;
• the plurality of pressure sources are provided by at least two hydraulic fluid pumps that each have at least one pressure output;
• each of the at least two hydraulic fluid pumps have their own control unit;
• a sensor is present at every pressure output of an associated hydraulic fluid pump to determine the pressure that is applied, said sensor being connected to the associated control unit of the at least two hydraulic fluid pumps so that they are able to detect an error event in dependence on the pressure applied;
• a sensor for sensing the load pressure is connected downstream of the first valve block output, which sensor is connected to the control units of the at least two hydraulic fluid pumps;
• a check valve is provided at each pressure output of the at least two hydraulic pumps;
• and
• if one of the control units detects a failure of a sensor at the pressure output, a control of the pressure source linked to the failed sensor is continued while using the sensor for sensing the steering supply pressure.

A hydraulic system for a hydraulically actuable work machine comprising a switching valve block having

• a plurality of valve block inputs for a respective connection to a pressure output of one or more hydraulic fluid pumps;
• a plurality of valve block outputs for outputting a pressurized hydraulic fluid;
• at least one valve arranged between valve block inputs and valve block outputs and adapted to selectively produce a fluid connection between a first valve block input and a first valve block output or between the first valve block input and a second valve block output;
• a plurality of pressure sources, of which each one is connected to a respective valve block input;
• and
• a plurality of hydraulic consumers of which each one is connected to a respective valve block output, wherein
• the first valve block output has a fixed fluid connection to a second valve block input;
• steering is connected to the first valve block output;
• the plurality of pressure sources are provided by at least two hydraulic fluid pumps that each have at least one pressure output;
• each of the at least two hydraulic fluid pumps have their own control unit;
• and
• the control units are respectively connected to different voltage supplies.