A steering device for a steerable machine, particularly a construction machine, comprising a steering element for manual input of steering commands, a steering actuator for driving a steering adjustment of a travel unit of the construction machine, and a transmission device, which is arranged between the steering element and the steering actuator, the transmission device including an actuator orbitrol for driving the steering actuator. Furthermore, the invention relates to a construction machine having such a steering device, as well as to a method for steering a steerable machine, particularly a construction machine.

A method (300) and control arrangement (210) for controlling a vehicle (100) to freewheel with engine off. The vehicle (100) has an engine (260) for propelling the vehicle (100) and a hydraulic power steering system (400). The hydraulic power steering system (400) comprises a primary power steering pump (270a) arranged to be driven by the engine (260) and a secondary power steering pump (270b). The method (300) includes: determining (301) when to start freewheeling the vehicle (100) with its engine off; and prior to starting the freewheeling of the vehicle (100) with engine off, determining (302) to start the secondary power steering pump (270b).

A work vehicle includes a steering wheel, a steering cylinder, a steering valve, a feed line, a return line, an electromagnetic valve, and a controller. The steering valve is configured to supply hydraulic fluid to the steering cylinder in response to steering of the steering wheel. The feed line is configured to feed the hydraulic fluid from the steering valve to the steering cylinder. The return line is configured to return the hydraulic fluid from the steering cylinder to the steering valve. The electromagnetic valve is disposed between the feed line and the return line. The controller opens the electromagnetic valve in response to an oil pressure in the feed line.

Methods, apparatus, and articles of manufacture are disclosed to modify a steering assist of a hydraulic power steering system. A disclosed method includes calculating modifier values based on sensor data of a vehicle, calculating a torque modifier value based on the modifier values, and generating a final torque assist based on the torque modifier value and a base torque assist, the final torque assist to be applied to a steering system of the vehicle.

A steering apparatus for an industrial vehicle includes: a manual steering circuit which includes a first valve opened/closed according to an operation of a steering wheel and supplies hydraulic oil discharged from a hydraulic pump to a steering cylinder through the first valve; an automatic steering circuit which includes a second valve opened/closed according to a calculation result of automatic operation control and supplies the hydraulic oil discharged from the hydraulic pump to the steering cylinder through the second valve; and a branching valve which is disposed between the hydraulic pump and the first and second valves and branches the hydraulic oil to the manual steering circuit and the automatic steering circuit. The branching valve is a priority valve which preferentially supplies the hydraulic oil to the manual steering circuit at a designed flow rate equal to or larger than a predetermined flow rate for operating the steering cylinder.

A vehicle steering assist system, including an engine pump, a flow-rate restricting mechanism, a motor pump, a motor-pump controller, and a steering-force assist device, wherein the steering assist system is configured to restrict an engine-pump ejection flow rate to be lower than a required receiving flow rate to be received by the assist device when the engine pump is operated by being driven by an engine rotating at an idling speed, the engine-pump ejection flow rate being a flow rate of a working fluid ejected from the engine pump to the assist device via the restricting mechanism, and wherein the motor-pump controller is configured to control a motor-pump ejection flow rate such that an insufficient flow rate of the working fluid is covered by the motor-pump ejection flow rate, the insufficient flow rate being a shortage in the required receiving flow rate not covered by the engine-pump ejection flow rate.

A steering assist system for a hybrid vehicle capable of being driven by both of an engine and a drive motor, including a first assist portion and a second assist portion configured to assist a steering force respectively utilizing the engine and an electric motor each as a drive source, wherein the steering force is assisted only by the second assist portion in a motor-driven state in which the vehicle is driven only by the drive motor, and wherein the steering assist system is configured to, upon occurrence of a failure of the second assist portion in the motor-driven state, drive the engine, execute assist switching from an assist by the second assist portion to an assist by the first assist portion, and gradually increase, in the assist switching, an assist force by the first assist portion up to a set assist force when the vehicle is being steered.

A hydraulic power steering system comprising: a first hydraulic pump driven by a rotation of the driving wheels of a vehicle such that a first hydraulic pressure is generated; a second hydraulic pump arranged such that a second hydraulic pressure is generated; a clutch arrangement switchable between an engaged state in which the clutch arrangement is arranged to transmit power from the engine to drive the second hydraulic pump, and a disengaged state in which the clutch arrangement is arranged to disengage power transmission from the engine to the second hydraulic pump; and a hydraulic power steering arrangement to be connected to a steering system of the vehicle to amplify steering input exerted by a driver by applying a hydraulic pressure provided by the first and/or second hydraulic pressure.

A vehicle includes a chassis, a tractive element coupled to the chassis, and a parking brake system. The chassis includes at least one of a transmission or a structural frame. The parking brake system includes a parking brake configured to brake the tractive element when engaged. The parking brake is configured to be disengaged to permit rotation of the tractive element in response to the parking brake receiving a fluid. The parking brake system includes a fluid supply configured to supply the fluid to the parking brake to disengage the parking brake. The fluid supply is configured to stop supplying the fluid in response to a component of the vehicle ceasing operation. The parking brake system includes a pump coupled to the chassis and configured to supply the fluid to the parking brake at least when the component of the vehicle is not operating.

A power steering system for a vehicle, the power steering system comprising a power steering pump, an electrical machine unit, a clutch arrangement and a power steering control system configured to control the power steering system, wherein the electrical machine unit is configured to drive the power steering pump and to be operatively connected to and powered by an energy storage of the vehicle, and the power steering pump is configured to be connected to a torque output source arranged downstream of a transmission system of the vehicle, the power steering pump being configured to be driven by means of torque provided by the torque output source.