Abstract: An electric driveline, comprising at least a first and a second electric machine, at least a first and a second output, and at least a first planetary gear set including three drivingly connected components including a sun gear, a planetary carrier and a ring gear. The first and the second electric machine are drivingly connected or connectable with the first and the second output via the first planetary gear set. At least one of the first and the second electric machine is selectively connected with the same one of the three components of the first planetary gear set via at least two different gear ratios, and/or the same one of the three components of the first planetary gear set is selectively connected with each of the first and the second output via at least two different gear ratios. The disclosure further concerns a method of operating an electric driveline.

Abstract: Methods and systems are provided for a transmission. In one example, the transmission may include a brake system arranged in-line with a second brake along a longitudinal axis of the transmission. Each brake may have a plurality of separator plates which may be secured to a housing of the transmission by at least one pin. The brake system may further include an end plate positioned between the first brake and the second brake, the end plate secured to the housing by a plurality of dowel pins.

Abstract: A transmission, such as a transmission for a vehicle, a driveline including the transmission, and a method of performing a gear shift using the transmission. The transmission comprises a first transmission shaft, a first gear disposed on the first transmission shaft, a first wet clutch, and a first synchronizer. The first wet clutch and the first synchronizer are configured to selectively drivingly engage the first gear with the first transmission shaft and are connectable in series between the first gear and the first transmission shaft, such that the first gear is drivingly engaged with the first transmission shaft only when both the first wet clutch and the first synchronizer are engaged, and such that the first gear is drivingly disengaged from the first transmission shaft when either one or both of the first wet clutch and the first synchronizer is/are disengaged.

Abstract: A clutch assembly may have an axially slidable first plate, an axially fixed second plate disposed opposite the first plate, and a clutch pack arranged between the first plate and the second plate. The clutch pack may have a number of axially slidable consecutively arranged friction plates and separator plates. The assembly may also have an actuator axially movable between a first position and a second position, where, in the first position, the clutch pack is opened and, in the second position, the clutch pack is closed and the friction plates are frictionally engaged. The assembly may also have a return spring configured to bias the actuator in a direction away from the clutch pack towards the first position. The assembly may also have an engagement spring element configured to exert an elastic force on the clutch pack.

Abstract: Various methods and systems are provided for thermal management of an electric motor via a coolant flow around portions of the electric motor, where the coolant flow is disrupted by an arrangement of pin-fins. In one example, an electric motor comprises: a casing including a coolant inlet arranged opposite to a coolant outlet across a central axis of the electric motor; a stator housed within the casing and forming a plurality of pin-fins extending straight outward radially, relative to the central axis, from outer circumferential surfaces of the stator in a staggered arrangement around an entire perimeter of the stator; and a plurality of clearances formed between adjacent pin-fins of the plurality of pin-fins, the plurality of clearances adapted to flow a coolant from the coolant inlet to the coolant outlet.

Abstract: Methods and systems are provided for controlling and diagnosing a mechanical vehicle component. In one example, a method may include determining an input device state and an electric machine torque at a diagnostic controller, and identifying a fault condition based on these determinations. Further, the diagnostic controller may trigger an active fault state of the mechanical vehicle component to avoid unintended vehicle acceleration, particularly at low speeds.

Abstract: The present document relates to an electric drive axle comprising an electric motor, a first planetary gear set, a second planetary gear set, and a differential assembly. The electric motor is drivingly connected or drivingly connectable to the differential assembly via the first planetary gear set and via the second planetary gear set.

Abstract: Methods and systems for a vehicle transmission are provided herein. The vehicle transmission includes an input interface configured to mechanically couple to a motive power source. The vehicle transmission further includes a first disconnect device releasably mechanically coupling a first output to a first drive axle and a second disconnect device releasably mechanically coupling a second output to a second drive axle.

Abstract: Systems and methods are provided for cooling an electric motor, the electric motor being fluidically coupled to a coolant sump of a gearbox. In one example, a system may include the gearbox including the coolant sump, the electric motor coupled to the gearbox, an outer shaft fluidically coupling the electric motor to the coolant sump, an inner shaft extending through each of the coolant sump and the outer shaft, and one or more surface features disposed along a portion of the inner shaft extending within the outer shaft. Upon rotation of the inner shaft during operation of the electric motor, a coolant in the coolant sump may be drawn through the outer shaft from the coolant sump into the electric motor. In this way, the coolant may be passively directed to the electric motor with minimal cost, packaging size, and system complexity and without significant losses in overall system efficiency.

Abstract: Systems and methods for a multi-speed electric axle are provided. The multi-speed electric axle includes an electric motor that is rotationally coupled to an input shaft. The multi-speed electric axle also includes a planetary gearset connected to the input shaft via an input gear reduction, a lower-speed clutch that selectively grounds a ring gear in the planetary gearset to a housing, and a higher-speed clutch that selectively connects a sun gear to a carrier.

Abstract: An electric driveline system is provided. The electric driveline system includes a first electric machine and a second electric machine mechanically coupled to a transmission and a power take-off (PTO) assembly coupled to the first electric machine. The PTO assembly includes a first clutch coupled to a PTO gearset and designed to selectively disconnect a PTO from the first electric machine and the PTO gearset is mechanically coupled to the first electric machine.

Abstract: A torque convertor and direct drive unit arrangement and operating methods are provided herein. In one example, a prime mover may be configured to be coupled to a transmission via one of a torque convertor and a direct drive unit, the direct drive unit including a higher range clutch and a lower range clutch.

Abstract: A method of shifting a vehicle transmission including a first clutching device and a second clutching device is described. At least a portion of the first clutching device is coupled with or configured to be coupled with at least a portion of the second clutching device. The method may include the steps of engaging the second clutching device, where engaging the second clutching device includes controlling a state of the second clutching device by changing a state of the first clutching device. A transmission controller and a vehicle driveline are also described.

Abstract: A power system for a vehicle comprising: a first engine, a second motor/generator, and a third motor/generator. The system further comprising: a first gearset with a first power train section coupled to an input side of the first gearset and a second power train section coupled to an output side of the first gearset. A mode selection device comprising at least two positions: a first position of the mode selection device coupling the third motor/generator to the first power train section, and a second position coupling third motor/generator to the second power train section. A clutch selectively connecting the first machine and the first power train section.

Abstract: Various methods and systems are provided for a system for cooling an electric motor that includes a rotor shaft rotatably mounted inside a motor housing, a lamination stack integrally connected to the rotor shaft, an encoder-end balance plate integrally connected to a first end of the lamination stack and a first end of the rotor shaft, an output-end balance plate integrally connected to a second end of the lamination stack and a second end of the rotor shaft, an oil supply coupled to the output-end balance plate and the rotor shaft. A closed-looped coolant pathway is formed between the transmission, the rotor shaft, the encoder-end balance plate, the lamination stack, and the output-end balance plate.

Abstract: Methods and systems are provided for a cooling jacket for an electric motor. In one example, a system may include a channel extending along a circumference of an inner surface of the cooling jacket between an inlet and an outlet of the cooling jacket. A cross-section of the channel may gradually change from the inlet to the outlet along the circumference in order to compensate an increase in coolant temperature by an increase in convective heat transfer such that cooling is balanced around a circumferential surface of the electric motor.

Abstract: A method and system for operating a transmission that includes two power take off devices is described. In one example, an internal combustion engine and/or an electric machine may supply power to accessory devices via first and second power take off devices. Alternatively, power may be delivered to the transmission via one or both of the first and second power take off devices.

Abstract: Torque converter arrangements and operating methods are provided herein. In one example, the torque converter includes a first attachment interface designed to rotationally couple to a prime mover and a second attachment interface designed to rotationally couple to a transmission. The torque converter further includes a lock-up clutch with an engagement spring embedded in an actuation piston, a plurality of separator plates supported by one or more guiding pins that extend through the plurality of separator plates and into a casing, and a plurality of friction plates interleaved with the plurality of separator plates, where the plurality of separator plates and friction plates are axially captured between the actuation piston and an end plate.

Abstract: Methods and systems for cooling an electric motor are provided. An electric motor cooling system, in one example, includes a stator with a first end winding on a first axial side, potting material at least partially enclosing the first end winding, and a plurality of coolant passages adjacent to the stator, where at least a portion of the plurality of coolant passages are adjacent to the potting material. The electric motor cooling system also includes a coolant passage housing including a plurality of fins defining a portion of the boundaries of the plurality of coolant passages and in face sharing contact with an outer surface of the stator.

Abstract: Methods and systems for a vehicle transmission are provided. In one example, a vehicle transmission system includes a first planetary gear set rotationally coupled to a second planetary gear set and a first electrical machine rotationally coupled to a gear in the first planetary gear set. The vehicle transmission system further includes a second electrical machine rotationally coupled to a gear in the second planetary gear set and a first clutch configured to selectively disconnect the first and second planetary gear sets from a drive axle.