Control system and a vehicle comprising the control system

A vehicle comprising:

• a front part and a rear part interconnected in an articulated manner, the parts being rotatable relative to one another around an articulation via two hydraulic steering cylinders arranged between the two parts;
• a control system for controlling the relative movement of the parts, the control system comprising
• a first control valve unit connected to said hydraulic steering cylinders for regulation thereof,
• a first operable control means for controlling the first control valve unit;
• a second control valve unit connected to said hydraulic steering cylinders for regulation thereof,
• a second operable control means for controlling the second control valve unit;
• a hydraulic prioritization circuit for prioritizing said first control means over said second control means, said hydraulic prioritization circuit being controlled via hydraulics in such a way that the effect of the second control means on the regulation of the hydraulic steering cylinder is prevented by and during actuation of said first control means.

A system for controlling at least one hydraulic steering cylinder, comprising:

• a first control valve unit which is connected to said hydraulic steering cylinder for regulation of the latter;
• a first operable control means which is adapted for controlling the first control valve unit;
• a second control valve unit which is also connected to said hydraulic steering cylinder for regulation of the latter;
• a second operable control means which is adapted for controlling the second control valve unit;
• means for prioritizing the first control means;
• wherein the second control valve unit comprises a directional valve which is connected to the hydraulic steering cylinder for regulation of the latter;
• and
• wherein the prioritizing means is controlled via hydraulics in such a way that the effect of the second control means on the regulation of the hydraulic steering cylinder is prevented by and during actuation of said first control means and wherein the prioritizing means is adapted, for prioritization, to bring the directional valve of the second control valve unit into a position in which its effect on the regulation of the hydraulic steering cylinder is at least substantially reduced, irrespective of the position of the second control means.

A system for controlling at least one hydraulic steering cylinder to provide steering to an articulated vehicle, comprising:

• a first control valve unit which is connected to said hydraulic steering cylinder for regulation of the latter;
• a first manually operable control means which is adapted for controlling the first control valve unit;
• a second control valve unit which is also connected to said hydraulic steering cylinder for regulation of the latter;
• a second manually operable control means which is adapted for controlling the second control valve unit;
• and
• means for prioritizing the first manually operable control means;
• wherein the second control valve unit comprises a directional valve which is connected to the hydraulic steering cylinder for regulation of the latter;
• and
• wherein the prioritizing means is controlled via hydraulics in such a way that the effect of the second manually operable control means on the regulation of the hydraulic steering cylinder is prevented by and during actuation of said first manually operable control means and wherein the prioritizing means is adapted, for prioritization, to bring the directional valve of the second control valve unit into a position in which its effect on the regulation of the hydraulic cylinder is at least substantially reduced, irrespective of the position of the second control means.

A system for controlling at least one hydraulic steering cylinder, comprising:

• a first control valve unit which is connected to said hydraulic steering cylinder for regulation of the latter;
• a first operable control means which is adapted for controlling the first control valve unit;
• a second control valve unit which is also connected to said hydraulic steering cylinder for regulation of the latter;
• a second operable control means which is adapted for controlling the second control valve unit;
• means for prioritizing the first control means;
• wherein the second control valve unit comprises a pilot-controlled directional valve which is connected to the hydraulic steering cylinder for regulation of the latter;
• and
• wherein the prioritizing means is controlled via hydraulics in such a way that the effect of the second control means on the regulation of the hydraulic steering cylinder is prevented by and during actuation of said first control means and wherein the prioritizing means is adapted, for prioritization, to at least equalize the pressure on opposite sides of the directional valve and thereby bring the directional valve of the second control valve unit into a position in which its effect on the regulation of the hydraulic steering cylinder is at least substantially reduced, irrespective of the position of the second control means.

A system for controlling at least one hydraulic steering cylinder comprising:

• a first control valve unit which is connected to said hydraulic cylinder for regulation of the latter;
• a first operable control means which is adapted for controlling the first control valve unit;
• a second control valve unit which is also connected to said hydraulic steering cylinder for regulation of the latter;
• a second operable control means which is adapted for controlling the second control valve unit;
• and
• means for prioritizing the first control means;
• wherein the prioritizing means is controlled via hydraulics in such a way that the effect of the second control means on the regulation of the hydraulic steering cylinder is prevented by and during actuation of said first control means;
• and
• wherein the prioritizing means for this purpose comprises a flow sensing means connected to a main line between the first control valve unit and a pump which is adapted to provide the hydraulic steering cylinder with pressurized oil, or a main line between the first control valve unit and a tank which comprises the oil, in order to initiate the prioritization upon detection of a flow in the first control valve unit.