A floating device for an aerial work platform, comprising a pressure oil source (100), a controller (200), a left floating device, and a right floating device, a chassis (700), and a swing axle (600). The left floating device comprises a left hydraulic cylinder (300), a left balance valve (310), and a left locking device; the right floating device comprises a right hydraulic cylinder (400), a right balance valve (410), and a right locking device; one end of the left hydraulic cylinder (300) and one end of the right hydraulic cylinder (400) are hinged on the chassis (700); the swing axle (600) is hinged with the chassis (700); the other end of the left hydraulic cylinder (300) and the other end of the right hydraulic cylinder (400) are hinged on two opposite ends of the swing axle (600); and the left locking device and the right locking device constitute second-level locking of the left hydraulic cylinder (300) and the right hydraulic cylinder (400), thereby ensuring that the aerial work platform will not tip over due to the sliding of the hydraulic cylinders.

A vibration damper with a damping force adjusting device and a height adjusting device for changing the axial position of a piston of the vibration damper, characterized in that the damping force adjusting device is adjusted depending on at least one operating parameter of the height adjusting device, and when there is a change in the at least one operating parameter there is also a change in at least one operating parameter of the damping force adjusting device. A method of operating a vibration damper with a controller and a motor vehicle including such vibration damper and controller is also disclosed.

A method for keeping a vehicle on course by determining a lateral acceleration of the vehicle; establishing a desired lateral inclination of the vehicle depending on the lateral acceleration determined in step a); adjustment of at least one actuator of an active chassis device of the vehicle, so the vehicle takes on the desired lateral inclination determined in step b); and c) carrying out a compensatory engagement by adjustment of at least one actuator of an active chassis device of the vehicle, so the vehicle takes on the desired lateral inclination determined in step b), wherein, in step d), at least one additional compensatory engagement is carried out by an additional active chassis device for the at least partial compensation of a yaw movement of the vehicle caused by the adjustment of the at least one actuator of the active chassis device.

Self-propelled vehicles that adjust the pitch of the vehicle during use are disclosed. The vehicle may include a suspension system position sensor and a control unit that adjusts a suspension element based at least in part on a signal from the suspension system position sensor. In some embodiments, the self-propelled vehicle may include an inclinometer for measuring the pitch of the terrain.

A suspension device includes an actuator device provided with an extensible/contractible actuator body interposed between a sprung member and an unsprung member of a vehicle, a pump that supplies fluid to the actuator body to extend or contract the actuator body, and a controller that controls a rotation number of the pump. The controller has a road surface state index obtainment unit that obtains a road surface state index and a target rotation number determination unit that determines a target rotation number of the pump on the basis of the road surface state index.

Aspects of the present invention relate to an actuator system for a vehicle suspension system comprising: a first actuator comprising a piston, a first upper fluidic chamber and a second lower fluidic chamber, the first and second fluidic chambers separated by the piston; a second actuator comprising a piston, a first upper fluidic chamber and a second lower fluidic chamber, the first and second fluidic chambers separated by the piston; a first hydraulic gallery fluidly connecting the first upper fluidic chamber of the first actuator and one of the first and second fluidic chambers of the second actuator; a second hydraulic gallery fluidly connecting the second lower fluidic chamber of the first actuator and the other of the first and second fluidic chambers of the second actuator; and at least one pump configured to pump fluid between the first and second hydraulic galleries.

A single axle suspension system that includes right and left dampers, first and second hydraulic circuits, and a pressurizing mechanism that is connected in fluid communication with at least one of the hydraulic circuits. The pressurizing mechanism is configured to provide active heave control by adding and removing hydraulic fluid to and from at least one of the hydraulic circuits to increase and decrease pressure inside at least one of the hydraulic circuits independent of damper movements. This in turn causes a simultaneous increase in the fluid pressure inside either the first working chambers of the right and left dampers or the second working chambers of the right and left dampers to provide pitch stiffness that counters fore and aft heave of the vehicle. The pressurizing mechanism is either a bi-directional pump or a ball/screw mechanism that actuates a variable volume chamber.

A device and a method of estimating damper force and damper velocity in an active suspension system. First and second pressure sensors sense pressures of a rebound chamber and a compression chamber of a damper in the active suspension system. A controller calculates damper force using the pressures and effective hydraulic pressure areas of the rebound chamber and the compression chamber and calculating damper velocity using pressure-fluid rate characteristics of first to third valve sets and the pressures of the rebound chamber and the compression chamber such that a sum of fluid rates is zero in a node connected between any one of the first to third valve sets and the rebound chamber or the compression chamber, the first to third valve sets being connected between the rebound chamber and an accumulator, between the rebound chamber and the compression chamber, or between the compression chamber and the accumulator.

An unmanned ground-based hygiene maintenance vehicle, UGV, includes a housing with a base plate, top plate and housing side wall substantially perpendicular to the base plate. Arranged in the housing is at least one wheel drive coupled to at least one wheel in a recess in the base plate. The UGV includes sensors for sensing the environment of the UGV, and a controller for autonomous location and navigation of the UGV based on sensing parameters of the sensors. The UGV includes an articulated robot arm on the top plate of the housing and to support a hygiene maintenance tool. The UGV includes at least one load-receiving element coupled to the housing side wall and extending outwards from the housing side wall, wherein the load-receiving element includes a load support surface for supporting a hygiene maintenance tool supply module with respect to a vertical direction extending transverse to the base plate.

A hydraulic suspension system for a motor vehicle having at least a pair of road engaging wheels. The suspension system includes, a hydraulic cylinder coupled with the each of the pair of road engaging wheels, the hydraulic cylinder defining a cap end volume and a rod end volume separated by a piston. A hydraulic supply circuit for the hydraulic cylinder includes, a high pressure hydraulic source, a low pressure hydraulic drain, a pair of hydraulic sub circuits each coupled to one of the hydraulic cylinder cap and rod end volumes. Each hydraulic sub circuit includes, a proportional supply flow valve coupled with the high pressure hydraulic source and one of the cylinder volumes, a return flow control proportional valve coupled with the low pressure hydraulic drain and the one cylinder volume, and an accumulator coupled to the associated hydraulic cylinder volume through an accumulator fill control proportional valve.