Abstract: A propulsion system for vehicle propulsion component having a variable displacement hydraulic pump, a hydraulic motor, adapted to drive the rotation of the propulsion component, an electric motor, adapted to drive the hydraulic pump, a source of electric power, and a controller configured, as a function of a setpoint value, to control the displacement of the hydraulic pump and the rotational speed of the electric motor so as to achieve the setpoint value while maintaining a rotational speed of the electric motor greater than a lower threshold value.

Abstract: A process for start-up of a propulsion system for a vehicle displacement component. The propulsion system includes a hydraulic pump, a hydraulic motor fed by the hydraulic pump via a closed-loop hydraulic circuit, and an electric motor. The process for start-up includes the following steps, given a configuration when the propulsion system is at a standstill, in which the electric motor, the hydraulic pump and the feed pump are at a standstill, and the hydraulic motor is disengaged: start-up of the feed pump, starting up of the electric motor, setting in rotation of the hydraulic pump, adjustment of the displacement of the hydraulic pump and/or of the rotational speed of the electric motor for providing a flow rate corresponding to a setpoint on the hydraulic motor, start-up of the hydraulic motor.

Abstract: A method for controlling the traction of a vehicle hydraulic assistance circuit, including a target pressure is applied, a setpoint pressure and a theoretical value of a parameter are determined, a pressure setpoint is applied to the hydraulic pump, equal to the setpoint pressure, and an actual value is measured in the hydraulic assistance circuit. The actual value measured in the hydraulic assistance circuit is compared to the theoretical value, and if a gap between the actual value and the theoretical value is greater than a threshold value, a step of adjusting the setpoint is carried out in which the pressure setpoint of the hydraulic pump is modified so that it is equal to an actual pressure, to within an adjustment coefficient.

Abstract: A vehicle drive assistance system equipped with an open hydraulic circuit has a hydraulic pump, a hydraulic motor and a reservoir. The system has a three-position valve suitable for: in a first position, supplying the hydraulic motor in a first direction of operation; in a second position, fluidly isolating the hydraulic motor from the hydraulic pump and connecting the hydraulic motor to the reservoir; and in a third position, supplying the hydraulic motor in a second direction of operation. A flow controller is positioned between the hydraulic pump and the three-position valve. The flow controller is configured in such a way as to selectively allow or not allow the passage of fluid through the supply duct of the hydraulic pump toward the three-position valve.

Abstract: The present invention concerns a hydraulic system comprising a hydraulic pump (130) installed on a truck tractor (10), a hydraulic pipe (160) connected to the outlet of the pump (130) and a connector (170) positioned at the outlet of the pipe (160) and designed to be connected to a complementary socket (180) provided on a trailer (20) in order to supply a ram (110) positioned on the trailer, for example for tipping purposes, characterised by the fact that it comprises a circuit selector (210) designed to connect said socket (180) selectively either to a ram (110) or a conduit (220) supplying a drive assistance circuit and an assistance circuit return conduit (250) designed to be connected to a tank (120) positioned on the truck tractor.

Abstract: The present invention concerns a hydraulic system comprising a hydraulic pump (130) installed on a truck tractor (10), a hydraulic pipe (160) connected to the outlet of the pump (130) and a connector (170) positioned at the outlet of the pipe (160) and designed to be connected to a complementary socket (180) provided on a trailer (20) in order to supply a ram (110) positioned on the trailer, for example for tipping purposes, characterised by the fact that it comprises a circuit selector (210) designed to connect said socket (180) selectively either to a ram (110) or a conduit (220) supplying a drive assistance circuit and an assistance circuit return conduit (250) designed to be connected to a tank (120) positioned on the truck tractor.