A vehicle includes first and second electric machines constrained to rotate in unison and configured to power a common axle. A controller is programmed to, in response to activation of the vehicle, select one of the first and second speed sensors as a representative speed sensor, and, in response to the electric machines being in speed control, command speeds to the first and second electric machines based on a difference between a target speed of the electric machines and a measured speed of the representative speed sensor.

A vortex-producing fan controller uses a variable-speed vortex-producing fan to create a helical airflow within a server rack that couples with cooled air entering a data center through a floor opening situated near a bottom of the server rack and that draws the cooled air up through the server rack in a helical pattern. An input air temperature of air entering the variable-speed vortex-producing fan is measured using readings from a fan input air temperature sensor positioned above the server rack. A speed of the variable-speed vortex-producing fan and a flow rate of the cooled air coupled within the helical airflow up through the server rack are adjusted responsive to changes in the input air temperature of the air entering the variable-speed vortex-producing fan.

A vortex-producing fan controller uses a variable-speed vortex-producing fan to create a helical airflow within a server rack that couples with cooled air entering a data center through a floor opening situated near a bottom of the server rack and that draws the cooled air up through the server rack in a helical pattern. An input air temperature of air entering the variable-speed vortex-producing fan is measured using readings from a fan input air temperature sensor positioned above the server rack. A speed of the variable-speed vortex-producing fan and a flow rate of the cooled air coupled within the helical airflow up through the server rack are adjusted responsive to changes in the input air temperature of the air entering the variable-speed vortex-producing fan.

A system for automatically controlling operation of a milling drum on a cold planer includes an input device, a display device, a memory device configured to store a database of recommended plunge velocities at which a rotating milling drum having particular operational characteristics should be lowered into a pavement surface to break up and remove pavement material for various depths of cut to be achieved by the milling drum, and a processor in communication with the input device, the display device, and the memory device. The processor may be configured to receive, via the input device, a signal indicative of a particular depth of cut desired by an operator of the cold planer, determine from the database at least one plunge velocity at which the rotating milling drum should be lowered into the pavement surface during a milling operation for achieving the particular depth of cut, display the at least one plunge velocity for the particular desired depth of cut on the display device, generate a command control signal indicative of the at least one determined plunge velocity, and communicate the command control signal to an actuator configured to regulate a rate of descent of the milling drum into the pavement surface.

A system for automatically controlling operation of a milling drum on a cold planer includes an input device, a display device, a memory device configured to store a database of recommended plunge velocities at which a rotating milling drum having particular operational characteristics should be lowered into a pavement surface to break up and remove pavement material for various depths of cut to be achieved by the milling drum, and a processor in communication with the input device, the display device, and the memory device. The processor may be configured to receive, via the input device, a signal indicative of a particular depth of cut desired by an operator of the cold planer, determine from the database at least one plunge velocity at which the rotating milling drum should be lowered into the pavement surface during a milling operation for achieving the particular depth of cut, display the at least one plunge velocity for the particular desired depth of cut on the display device, generate a command control signal indicative of the at least one determined plunge velocity, and communicate the command control signal to an actuator configured to regulate a rate of descent of the milling drum into the pavement surface.

An apparatus for controlling vehicle movement comprises processing means configured to receive first signals from a receiving means arranged to receive transmitted signals from a remote control device indicating a requested motion of the vehicle. From the first signals or an additional signal received from a sensing means, one or more distance values indicative of a distance from a point on the vehicle to an object is determined, and a maximum speed value for the vehicle is determine in dependence on the one or more distance values. The processing means provides an output signal for controlling speed of the vehicle based on the requested motion. The output signal is arranged to control the speed of the vehicle to be less than or equal to the maximum speed value.

An apparatus for controlling vehicle movement comprises processing means configured to receive first signals from a receiving means arranged to receive transmitted signals from a remote control device indicating a requested motion of the vehicle. From the first signals or an additional signal received from a sensing means, one or more distance values indicative of a distance from a point on the vehicle to an object is determined, and a maximum speed value for the vehicle is determine in dependence on the one or more distance values. The processing means provides an output signal for controlling speed of the vehicle based on the requested motion. The output signal is arranged to control the speed of the vehicle to be less than or equal to the maximum speed value.

A rotary driving device and a method for correcting a system error of the rotary driving device are provided. The rotary driving device includes a driven assembly, a driving assembly, a torque transmission member, a first torque sensor, and a second torque sensor. The driving assembly includes a fixed component and a rotating component, the rotating component is rotatably connected to the fixed component, the torque transmission member is connected to the rotating component and the driven assembly, the rotating component is configured to drive the driven assembly to rotate through the torque transmission member. The first torque sensor is connected to the fixed component and the torque transmission member, and the second torque sensor is disposed on the driven assembly.

A rotary driving device and a method for correcting a system error of the rotary driving device are provided. The rotary driving device includes a driven assembly, a driving assembly, a torque transmission member, a first torque sensor, and a second torque sensor. The driving assembly includes a fixed component and a rotating component, the rotating component is rotatably connected to the fixed component, the torque transmission member is connected to the rotating component and the driven assembly, the rotating component is configured to drive the driven assembly to rotate through the torque transmission member. The first torque sensor is connected to the fixed component and the torque transmission member, and the second torque sensor is disposed on the driven assembly.

A self-regulating fire pump unit which can be controlled to operate under required conditions for sourcing a fire protection system such as sprinklers. The fire pump unit can be operated in accordance with a control curve based on detected pressure and flow. The control curve can include: a) a first setpoint of rated total value of the system load for the pressure and the flow, b) a second setpoint of a minimum partial percentage of the rated total value of the pressure at an over-percentage of the rated total value of the flow, c) a path which maintains the rated total value of the pressure for all values of the flow up to the first setpoint, d) a path between the first setpoint and the second setpoint, e) a path from the second setpoint which limits values of the pressure for values of the flow greater than the second setpoint.