In a hydraulic driving system, a plurality of loading-line driving devices adjust a flow rate of an operating liquid flowing from a loading-line pump to a loading-line actuator, and a steering-line driving device adjusts a flow rate of the operating liquid flowing from the steering-line pump to the steering actuator. When one of a plurality of loading-line actuators is driving, a switching valve device connects a loading-side passage and a steering-side passage. When any of the plurality of loading-line actuators is not driving, the switching valve device disconnects the loading-side passage and the steering-side passage.

In a hydraulic driving system, a plurality of loading-line driving devices adjust a flow rate of an operating liquid flowing from a loading-line pump to a loading-line actuator, and a steering-line driving device adjusts a flow rate of the operating liquid flowing from the steering-line pump to the steering actuator. When one of a plurality of loading-line actuators is driving, a switching valve device connects a loading-side passage and a steering-side passage. When any of the plurality of loading-line actuators is not driving, the switching valve device disconnects the loading-side passage and the steering-side passage.

A steering assistance device includes: a steering angle detection unit that detects the steering angle of a vehicle; a pump unit that performs steering assistance of the vehicle by using oil pressure; a motor that performs steering assistance of the vehicle by using electrical power; and a steering control unit that causes the pump unit to perform steering assistance with the steering assistance amount thereof reduced by a predetermined amount from the predetermined steering assistance amount, and causes the motor to perform steering assistance, in a case where the pump unit can perform steering assistance in a steering assistance amount predetermined for the detected steering angle.

A steering assistance device includes: a steering angle detection unit that detects the steering angle of a vehicle; a pump unit that performs steering assistance of the vehicle by using oil pressure; a motor that performs steering assistance of the vehicle by using electrical power; and a steering control unit that causes the pump unit to perform steering assistance with the steering assistance amount thereof reduced by a predetermined amount from the predetermined steering assistance amount, and causes the motor to perform steering assistance, in a case where the pump unit can perform steering assistance in a steering assistance amount predetermined for the detected steering angle.

A steering assistance device includes: a steering angle sensor for detecting a steering angle of a vehicle; a motor for performing steering assistance of the vehicle by applying torque to a steering shaft; and a control unit for increasing increases the amount of steering assistance by the motor in case where the detected steering angle is included in an angular range corresponding to a steering play segment in which steering will not alter the direction of wheels of the vehicle as compared with a case where the detected steering angle is not included in an angular range.

A fluidic control system (1) for controlling a vehicle, which includes a controller (2) and a closed fluidic circuit. The circuit includes a pump (3) for pressurizing fluid in the circuit, valve means (40, 50, 60), an actuator (4, 5, 6) and a precharge accumulator (7). The valve means (40, 50, 60) is fluidly connected to the inlet and outlet of the pump (3) and the actuator (4, 6) is fluidly connected to the valve means (40, 50, 60) for selectively receiving pressurized fluid therefrom. The precharge accumulator (7) includes a movable member (73, FIG. 2) that describes a variable volume (71) fluidly connected to the circuit between the valve means (40, 50, 60) and the inlet of the pump (3). The system (1) also includes a sensor (70) for determining the position of the movable member (73) for estimating the quantity of fluid and/or detecting an abnormal pressure variation within the circuit.

The invention relates to a pressure supply device for prioritised volume flow splitting, in particular in mobile working machines, comprising at least one adjusting pump (2) controllable by means of an LS signal as main pump, a constant-displacement pump (4) as an auxiliary pump, two pressure balances, a system to be supplied primarily, in particular in the form of steering hydraulics (PL), which outputs an LS signal, a system to be supplied secondarily, which outputs a further LS signal, in particular in the form of working hydraulics (PA), and a further system to be supplied hydraulically, in particular in the form of brake hydraulics (PB), wherein one pressure balance (DW1) is used to supply the system (PL) to be supplied primarily and/or the further hydraulic system (PB), the other pressure balance (DW2) is used to supply the system (PL) to be supplied primarily and/or the system (PA) to be supplied secondarily,

The operability can be improved when the rotational speed of the engine is low and the working device actuator and the steering actuator are operated in a combined manner, while the configuration of prioritizing the operation of the steering actuator is maintained. A control device (70) included in a wheel loader (1) determines whether a working device (4) is in load lifting operation or not based on the pressure that is between a working device directional switching valve (44) and an orifice (45) and is detected by a pressure sensor (71), and reduces the opening area of a steering control valve (37) when determining that the rotational speed of an engine (14) detected by a rotational speed sensor (72) is equal to or less than a predetermined threshold (Ns) and a working device is in the load lifting operation.

The operability can be improved when the rotational speed of the engine is low and the working device actuator and the steering actuator are operated in a combined manner, while the configuration of prioritizing the operation of the steering actuator is maintained. A control device (70) included in a wheel loader (1) determines whether a working device (4) is in load lifting operation or not based on the pressure that is between a working device directional switching valve (44) and an orifice (45) and is detected by a pressure sensor (71), and reduces the opening area of a steering control valve (37) when determining that the rotational speed of an engine (14) detected by a rotational speed sensor (72) is equal to or less than a predetermined threshold (Ns) and a working device is in the load lifting operation.

A control device for an unmanned vehicle includes a temperature data acquisition unit acquiring temperature data of hydraulic oil supplied to a first hydraulic actuator actuating a steering device of the unmanned vehicle, and a command output unit outputting a change command for changing a travel parameter of the unmanned vehicle based on the temperature data.