Abstract: A hydraulic power shovel includes a frame, a power cylinder, a hydraulic installation, and a control unit. The frame is configured to support a turret equipped with an arm terminated by a tool, such as a bucket having a tamping surface. The power cylinder is linked to the arm and is configured to press on the turret. The hydraulic installation includes an adjustable flow pump configured to supply the power cylinder via a slide valve and a hydraulic liquid tank. The control unit is linked to (i) a control member actuated by the operator and configured to generate a control signal, and (ii) a sensor configured to generate a sensor signal corresponding to a pressure and temperature of hydraulic liquid in the power cylinder. A vapour pressure diagram of the hydraulic liquid is available in the control unit.

Abstract: A hydraulic circuit includes a pump connected to a tank for supplying hydraulic liquid under pressure to a component via a directional control slide valve provided with a feed port connected to an inlet of the component and with a return port connected to an outlet of the component. The hydraulic circuit further includes a pressure limiter connected to the inlet of the component and the tank, and a feed control system for the hydraulic component including a pressure sensor installed upstream of the hydraulic component downstream of the feed port for supplying information about the pressure of the hydraulic liquid and a setpoint pressure. The feed control system further including an actuator for controlling the movement of the directional control slide valve, and a control unit for generating a control signal for the actuator based on information about the pressure measured at the feed port.

Abstract: A hydraulic circuit includes a pump connected to a tank for supplying hydraulic liquid under pressure to a component via a directional control slide valve provided with a feed port connected to an inlet of the component and with a return port connected to an outlet of the component. The hydraulic circuit further includes a pressure limiter connected to the inlet of the component and the tank, and a feed control system for the hydraulic component including a pressure sensor installed upstream of the hydraulic component downstream of the feed port for supplying information about the pressure of the hydraulic liquid and a setpoint pressure. The feed control system further including an actuator for controlling the movement of the directional control slide valve, and a control unit for generating a control signal for the actuator based on information about the pressure measured at the feed port.

Abstract: A control system for controlling a hydraulic installation with a plurality of receivers operating in parallel includes control units which regulate control positions of each of the receivers supplied by a pump, the pressure and flow rate of which are regulated by a regulator with or without flow rate sharing. The distributor associated with each receiver is switched between modes by a switch associated with each receiver. A counter supplies a control signal to the switches in order to switch them to flow rate sharing mode, if at least two receivers must be activated. Each control unit generates a pressure value and a flow rate value in order, in flow rate sharing mode, to generate a flow rate regulation signal corresponding to the sum of all the flow rates, and a pressure signal corresponding to the highest pressure out of all the pressures.

Abstract: A hydraulic power shovel includes a frame, a power cylinder, a hydraulic installation, and a control unit. The frame is configured to support a turret equipped with an arm terminated by a tool, such as a bucket having a tamping surface. The power cylinder is linked to the arm and is configured to press on the turret. The hydraulic installation includes an adjustable flow pump configured to supply the power cylinder via a slide valve and a hydraulic liquid tank. The control unit is linked to (i) a control member actuated by the operator and configured to generate a control signal, and (ii) a sensor configured to generate a sensor signal corresponding to a pressure and temperature of hydraulic liquid in the power cylinder. A vapour pressure diagram of the hydraulic liquid is available in the control unit.

Abstract: The disclosed device controls the steering of a commercial vehicle and comprises front wheels that can be oriented according to a first turning angle by a first actuator, rear wheels oriented according to a second turning angle by a second actuator, and a power circuit with a pressurized fluid source and power components that transmit hydraulic power to the actuators. The power components are controllable to configure the power circuit according to coupling modes between the front and rear wheels. The device includes a control circuit containing a power source and control components that are electrically controlled by an electrical control unit and transmit hydraulic commands relating to one of the determined coupling modes to the power components. The control components are hydraulically connected such that in the event of a fault in the electrical control, the commands permanently maintain the power circuit in the current coupling mode.

Abstract: A construction vehicle includes a wheeled chassis supporting at least one article of work equipment, hydraulically actuated, a hydraulic power unit driving the work equipment including a hydraulic pump connected to an hydraulic liquid holding unit and to a hydraulic control unit distributing hydraulic power the work equipment, a driver's compartment including a driver's floor, wherein the hydraulic liquid holding unit includes a main hydraulic reservoir which is disposed on the chassis at a level lower than the driver's floor level, and at least one auxiliary hydraulic reservoir which is disposed on the chassis at a level above the driver's floor level.

Abstract: A heavy-construction machine (1) including a working implement (5) having one or a number of arms (6) articulated with regard to the chassis (2) of the machine. An assembly consisting of at least one hydraulic cylinder (7) that causes the working implement (5) to move relative to the chassis (2) is provided together with a hydraulic circuit that supplies these cylinders based on the control commands issued by a hydraulic manipulator. The machine is capable of operating according to two distinct modes of which one is a lifting mode and the other is a loading mode. In each mode, cylinder travel can be freed when the manipulator is in a predetermined position corresponding to a position referred to as floating control. The machine further includes a mechanism for rendering the floating control position of the manipulator inactive when the machine is operating in lifting mode.

Abstract: A loading machine has working equipment which includes at least one arm, an actuator for displacing the arm, a working tool hingable with respect to the arm, a main kinematic chain forming together with the working tool part and the arm part a main deformable mechanism and a controllable tool actuator for deforming the main deformable mechanism to cause the tool to tilt. The machine also has a secondary kinematic chain forming together with the part of the arm, which is located in the area of articulation thereof on the frame, a deformable reference mechanism whose deformation directly corresponds to the inclination angle of the working tool, an angle sensor for measuring an angle displaying the deformation of the reference mechanism with respect to the frame, and a control device which is connected to the sensor and controls the feeding of the working tool actuator and/or the arm actuator.

Abstract: A loader including a vehicle including a structural frame and an elongate boom arm is provided. The boom arm is pivotally mounted at its first end to the frame and has at its second end an assembly for receiving a tool. The loader includes actuators to actuate the boom arm and its associated assembly. The loader also includes a control unit provided with user operable controls for controlling position and orientation of the boom arm and its associated assembly. The actuators integrally incorporate therein magnetic sensors operable to sense longitudinal extension of the actuators and thereby generate actuator feedback signals indicative of the longitudinal extension. The control unit processes the actuator feedback signals in a feedback control to render the position and orientation of the boom arm and its associated assembly adjustable using the user operable controls.

Abstract: The invention relates to a device for controlling the steering of a commercial vehicle comprising: two front wheels (126, 127) that can be oriented according to a first turning angle by means of at least one first actuator (120); two rear wheels (136, 137) that can be oriented according to a second turning angle by means of at least one second actuator (130); and a power circuit (101) comprising a pressurised fluid source and power components (111, 112, 113, 114, 115) that can transmit the hydraulic power to the actuators, said power components (111, 112, 113, 114, 115) being controllable in such away as to configure the power circuit (101) according to different coupling modes between the front wheels (126, 127) and the rear wheels (136, 137).

Abstract: The invention relates to a civil engineering loading machine (1) provided with a frame (5) and working equipment (2) which comprises at least one arm (3), an arm actuator (7) for rotatably displacing said arm (3) with respect to the frame (5), a working tool (15) hingable with respect to the arm (3), a main cinematic chain (20, 21) forming together with the working tool (15) part and the arm (3) part a main deformable mechanism and a controllable tool actuator (27) for generating the deformation of the main deformable mechanism in such a way that the inclination angle (100) of the working tool (15) with respect to the arm (3) is provided.

Abstract: A heavy-construction machine (1) including a working implement (5) having one or a number of arms (6) articulated with regard to the chassis (2) of the machine. An assembly consisting of at least one hydraulic cylinder (7) that causes the working implement (5) to move relative to the chassis (2) is provided together with a hydraulic circuit that supplies these cylinders based on the control commands issued by a hydraulic manipulator. The machine is capable of operating according to two distinct modes of which one is a lifting mode and the other is a loading mode. In each mode, cylinder travel can be freed when the manipulator is in a predetermined position corresponding to a position referred to as floating control. The machine further includes a mechanism for rendering the floating control position of the manipulator inactive when the machine is operating in lifting mode.