Volvo Construction Equipment Ab

Norrhydro Oy

Sandvik Mining and Construction Oy

Mika Sahlman

Kim Heybroek

Peter Stambro

Ari Lappalainen

Jussi Mäkitalo

Ari Sipola

Toni Peltomaa

An apparatus includes at least one processor and at least one memory including computer program code. The at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to: determine a target position for a drill bit of the track-mounted drill rig; determine a turning trajectory of an aiming point of the drill bit; monitor position of the turning trajectory of the aiming point of the drill bit with respect to the target position of the drill bit during approach of the track-mounted drill rig to the target position; and cause turning of the track-mounted drill rig to align the aiming point of the drill bit with the target position of the drill bit based on determining that the turning trajectory of the aiming point of the drill bit substantially coincides with the target position of the drill bit.

Controlling a track-mounted drill rig

A method of controlling a hydraulic actuator, wherein the hydraulic actuator includes a linear double-acting output member, and at least three working chambers in fluid connection with the output member, the working chambers having respective effective areas with a non-binary relationship; wherein the method includes selectively fluidly connecting each working chamber to either a high-pressure side or a low-pressure side to provide a plurality of discrete pressurization states of the hydraulic actuator; determining at least one of the pressurization states as a prevented pressurization state; and transitioning between a plurality of allowed pressurization states among the pressurization states while preventing transition to the at least one prevented pressurization state. A hydraulic actuator and a hydraulic system are also provided.

Method of controlling a hydraulic actuator, a hydraulic actuator, a hydraulic system and a working machine

A hydraulic system includes: a high-pressure line; a pump configured to supply pressurized hydraulic fluid to the high-pressure line; a variable displacement hydraulic machine connected by a fluid connection to the high-pressure line for rotationally driving the rotatable load; an electronic control unit; an energy storing device connected to the high-pressure line and configured to communicate with the high-pressure line by receiving energy from the high-pressure line and/or supplying energy to the high-pressure line; and a first detector configured to detect the amount of energy stored in the energy storing device and to transmit a signal indicating said amount of energy stored to the electronic control unit. The electronic control unit is configured to control the volume flow intake of the variable displacement hydraulic machine dependent on a target output of the variable displacement hydraulic machine and on the detected amount of energy stored in the energy storing device.

Hydraulic system and a method for controlling the same

A method of controlling a rotatable load by a hydraulic system, the method includes determining if the hydraulic system is in a first operating state or a second operating state; controlling the rotatable load in a valve control mode if the hydraulic system is in the first operating state, the valve control mode including controlling the rotatable load by controlling a valve arrangement; controlling the rotatable load in a displacement control mode if the hydraulic system is in the second operating state, the displacement control mode including controlling the rotatable load mainly by controlling the displacement of a hydraulic machine; and applying a non-zero absolute minimum displacement limitation to the hydraulic machine at least in the valve control mode.

Method of controlling a rotatable load, a hydraulic system and a working machine

The invention relates to a hydraulic device for a hydraulic system (). The hydraulic device includes a chamber arrangement including at least one high-pressure chamber for connection to a high-pressure side of the hydraulic system, and at least one low-pressure chamber for connection to a low-pressure side of the hydraulic system; and a movable member arranged to reciprocate at least partly inside the chamber arrangement in response to pressure variations within the at least one high-pressure chamber and within the at least one low-pressure chamber. The chamber arrangement further includes at least one tank chamber for connection to a tank-pressure side of the hydraulic system.

Hydraulic device, a hydraulic system and a working machine

A hydraulic system including: a pressure line; a pump; an actuator; a valve device configured to control the flow of pressurized hydraulic fluid to the actuator; an electronic control unit configured to control the valve device by a control signal proportional to the desired speed of the actuator at any given time; a pressure accumulator capable of supplying, together with the pump, pressurized hydraulic fluid for moving the actuator; a sensor device configured to measure, directly or indirectly, the amount of pressurized hydraulic fluid in the pressure accumulator at any given time; setting devices configured to set a setting signal to be proportional with the desired speed of the actuator at any given time. The electronic control unit is configured to restrict the targeted speed of the actuator not to exceed a predetermined maximum speed which is proportional to the amount of pressurized hydraulic fluid in the pressure accumulator.

Hydraulic system and a control system for the same

A hydraulic system and a method comprising a linear actuatorfor generating discrete sum forces, chambers A-D for generating discrete force components, at least two charging circuitsconfigured to maintain predetermined pressure levels of hydraulic fluid, independent control interfaces-configured to open and close connections of the first and second charging circuits to the chambers, and an electronic control unitfor controlling the control interfaces. At least two control interfaces are proportional valves which are used as shut-off valves and are independently switchable to the open and closed positions in a controlled manner. Moreover, non-throttled control and secondary control are implemented in the hydraulic system and the method.

Growing community of inventors

Tampere, Finland

Mika Sahlman