Abstract:
An electric powertrain (12) includes an engine (44) configured to provide mechanical energy and a generator (46) operably coupled to the engine and configured to convert at least a portion of the mechanical energy into electric energy. The electric powertrain further includes at least one electric motor (48) operably coupled to the generator, a plurality of driving members (34, 36), and at least one power electronics unit (50, 60) configured to control at least one of the engine and the generator. The at least one electric motor is configured to provide torque for the plurality of driving members.
Abstract:
An electric drive system (26) is provided having first and second output members (34, 36) and a driving shaft (31) having an axis or rotation. A plurality of electric motors (28a, 28b, 28c) are arranged adjacent to the driving shaft. Each motor has an output shaft (29a, 29b, 29c) in driving engagement with and substantially parallel to the driving shaft. A differential steering system (40) is operably disposed between the driving shaft and the first and second output members. The differential steering system includes a first planetary gear assembly (42) operably engaged both between the driving shaft and the first output member and between the driving shaft and the second output member. The first planetary gear assembly has an axis of rotation that substantially aligns with the axis of rotation of the driving shaft. A steering motor (70) is operatively engaged with the differential steering system and operable to simultaneously adjust the relative rotational speed of the first and second output members.
Abstract:
A hydraulic system (20) is provided having a reservoir (25) configured to hold a supply of fluid. The hydraulic system also has a variable displacement pump (36) configured to supply charge fluid and pilot control fluid to the hydraulic system. In addition, the hydraulic system has a closed-loop portion (32) configured to receive charge fluid from the variable displacement pump and drive a mechanism (22). The hydraulic system further has a pilot fluid supply portion (28) configured to direct pilot control fluid from the variable displacement pump to the closed-loop portion.
Abstract:
A dual purpose mobile machine (10) is disclosed. The mobile machine may have a power source (16) configured to propel the mobile machine and generate electrical power for use offboard the mobile machine. The machine may also have a work tool (12) driven by the power source.
Abstract:
A system for storing and recovering energy associated with a machine having ground engaging tracks is disclosed. The system includes a power source configured to supply mechanical energy for operation of the machine, and an electric generator operably coupled to the power source. The electric generator is configured to convert at least a portion of the mechanical energy into electric energy. The system further includes an electric motor operably coupled to the electric generator. The electric motor is configured to supply power to the ground engaging tracks. The system includes an energy storage device configured to store energy associated with the machine, and a controller configured to divert a portion of the energy supplied by the power source to the energy storage device while the machine travels in a first direction, and recover energy stored in the energy storage device for use while the machine travels in a second direction.
Abstract:
A drive arrangement (18) for a work machine (10) is disclosed. The drive arrangement has a first planetary gear set (52), a second planetary gear set (54), a third planetary gear set (56), a first motor (24), a second motor (26), and a third motor (28). The first, second, and third motors are drivingly connected to the first, second, and third planetary gear sets to simultaneously generate fewer than three separate output rotations.
Abstract:
A method is provided for dissipating power in a propelled machine having an electric drive system and a mechanical brake system. An inclination of the machine is determined (110a). A speed of the machine is determined (135). A retarding requirement is determined (155) based on the determined inclination and speed. A first portion of the retarding requirement is allocated to be met by the electric drive system, the first portion being less than or equal to a retarding capacity of the electric drive system (170). A second portion of the retarding requirement is allocated to be met by the mechanical brake system (175) if the retarding requirement is greater than the retarding capacity of the electric drive system (160).
Abstract:
A method is provided for controlling power provided by a drive train system (252) of a work machine (200), which includes an engine (230) that provides engine power to a generator (240) that, in turn, provides generator power to a motor (250). The motor (250) provides ground power to a travel mechanism (255) that enables the work machine (200) to travel across a terrain surface. In one embodiment, the method includes adjusting operation of the motor (250) based on a determined ground speed of the work machine (200). Based on the adjusted motor operations, the operation of the generator (250) is adjusted. Also, the operation of the engine (230) is adjusted such that the engine produces an amount of engine power that meets a load demand corresponding to the adjusted. Also, the operation of the engine (230) is adjusted such that the engine produces an amount of engine power that meets a load demand corresponding to the adjusted operation of the generator (240).