Doosan Bobcat North America, Inc.

A control device for a power machine can be configured to receive operation data associated with a current operation of the electric power machine, determine, based on the operation data, a commanded direction of travel for the electric power machine, determine, based on the operation data, an orientation of the work element relative to the lift arm, perform a comparison of the orientation to an orientation criterion, and, in response to determining a forward commanded direction of travel and based on the comparison, determine a modified operation parameter for the electric power machine, and control the at least one of electrical actuators based on the modified operation parameter.

Systems and methods for a power machine can provide greater functionality and operator comfort. A climate control system for a power machine can include a condenser, mounted on a front frame member of the power machine. Paths for air flow to cool an engine compartment can extend along airflow passages though a fuel tank. Secondary braking systems can allow a power machine to be stopped with modulated fashion when a primary power source is unavailable. Rear-view vision systems can include a camera mounted on a front pivoting frame (e.g., near the top of an operator station) to provide improved environmental information to an operator. A tilt actuator of the power machine can be configured to operate in a float mode.

Systems and methods for a compressor system are provided for selectively operating the compressor system with reduced power consumption. An output demand level of the compressor system can be monitored over time to identify a demand profile. A pressure setpoint for the compressor system can be selectively adjusted based on the demand profile, including to selectively transition between an operational pressure setpoint for an active demand profile and a reduced pressure setpoint for an inactive demand profile.

A power machine can include a control device and a hydraulic circuit that can include a hydraulic pump in communication with a hydraulic motor that is configured to operate with infinitely variable displacement. The control device can be configured to determine a control value based on a commanded travel speed for the power machine and a pressure in the hydraulic circuit, and control a run-time displacement of the hydraulic motor based upon the determined control value.

Disclosed are power machines having an electric power source which powers a priority system and a non-priority system. A control system determines from a discharge current limit of a battery of the electric power source a priority reserve of discharge current for the priority system, a non-priority reserve of discharge current for the non-priority system, and a pool of discharge current separate from the priority reserve and non-priority reserve. The control system controls the allocation of discharge current to the priority system and to the non-priority system as a function of the priority reserve, the non-priority reserve, and the pool. A control system also determines an inverter temperature scalar, a motor temperature scalar, and a discharge current scalar. Using these scalars, the control system determines a power management scalar which is used to derate power usage by a system such as the priority system.

A hydraulic system for a power machine can include a hydrostatic drive motor, a hydrostatic drive pump that is in communication with the hydrostatic drive motor via a hydrostatic drive circuit. A drain case can include one or more of the hydrostatic drive motor or the hydrostatic drive pump. A venturi device can include a main flow inlet in communication with the hydrostatic drive circuit, a main flow outlet, and a suction inlet in communication with the drain case. The hydraulic system can further include a heat exchanger, a tank, and an assist pump that includes an assist pump inlet in communication with the main flow outlet of the venturi device and an assist pump outlet in communication with the heat exchanger.

Disclosed embodiments include power machine, control systems for power machines, and methods of controlling a power machine to automatically couple an implement to an implement carrier of the power machine. Sensors are used to identify positions of a power machine and of an implement, such as a bucket, to be coupled to the implement carrier of the power machine. Control methods are implemented to allow the power machine to be automatically controlled to couple the implement to the implement.

A mower deck includes a top deck, a front wall, a rear wall opposite the front wall and a first side wall. The first side wall extends between the front and rear walls. A front baffle assembly extends downwardly from the top deck. The front baffle assembly extends from the first side wall toward a discharge opening that is positioned between the front and rear walls at a discharge side of the top deck. The front baffle assembly is configured to urge cut grass and debris toward the discharge opening. A discharge baffle is positioned proximate a rear end of the discharge opening and extends downwardly from the top deck. The discharge baffle and the rear wall define a discharge gap. The discharge gap is positioned on an opposite side of the discharge baffle from the discharge opening. The discharge gap is configured to allow airflow into the mower deck.

A lift arm structure for a power machine with a frame can include a lift arm and an electrical lift actuator. The lift arm can be configured to be movably secured to the frame to extend along a lateral side of the frame. The electrical lift actuator can be secured to the lift arm within a pocket defined by the lift arm and can be configured to extend and retract between the lift arm and the frame of the power machine to raise and lower the lift arm.

A power machine includes a frame, a plurality of wheels, a steering actuator, a hub, a link and a bell crank. The plurality of wheels are in contact with a ground surface that serves as a horizontal reference. The steering actuator is mounted on the frame and is configured for substantially vertical extension and retraction. The hub includes a stationary portion and a rotatable portion, wherein one of the plurality of wheels is mounted on the rotatable portion to pivot about a first axis. The link has a first end pivotally connected to the rotatable portion of the hub. The bell crank comprises first, second and third pivot joints. The first pivot joint is attached to an end of the steering actuator, the second pivot joint is attached to the stationary portion of the hub, and the third pivot joint is attached to a second end of the link.