A vehicle includes a connecting shaft, a drive axle, a multi-mode transmission, and a controller. The multi-mode transmission includes a first gear set having a first planetary gear carrier and a second gear set having a second planetary gear carrier, a first motor/generator coupled to the first gear set, a second motor/generator electrically coupled to the first motor/generator and coupled to the second gear set, a brake selectively limiting movement of a portion of the second gear set, and a clutch selectively rotationally coupling the second motor/generator to the connecting shaft. The first gear set is coupled to the connecting shaft, and the planetary gear carriers are rotatably coupled. The controller is configured to selectively configure the multi-mode transmission into an active neutral startup mode of operation by engaging the clutch and the brake such that at least one of the first motor/generator and the second motor/generator produces a voltage.

A drive system for a vehicle includes first and second gear sets, a connecting shaft and a first electrical machine coupled to the first gear set, a second electrical machine coupled to the second gear set, an output shaft that transports power from the first electrical machine and the second electrical machine to a tractive element of the vehicle, a first clutch selectively rotationally coupling the first gear set to the output shaft when engaged, and a second clutch selectively rotationally coupling the first gear set to the output shaft when engaged. A carrier of the first gear set is selectively coupled to a carrier of the second gear set. The output shaft is aligned with the connecting shaft, the first electrical machine, and the second electrical machine. The first and second clutches are engaged when the drive system is reconfigured into forward and reverse modes of operation, respectively.

The invention relates to a continuously variable transmission (CVT) comprising a ratio varying unit and a compound epicyclic gear set. The ratio varying unit has a rotating first side and a rotating second side, the rotational axes of the first and second sides being coaxial. The compound epicyclic gear set comprises a first set of planets, being rotationally mounted within a carrier and meshing with a sun gear. The epicyclic gear set also has a first annulus gear and a second set of planets; the second set of planets also being rotationally mounted within the carrier and meshing with a second annulus gear. One of the first or second rotating sides of the ratio varying unit is coupled to the carrier and the other of the first or second rotating sides of the ratio varying unit is coupled to the sun gear.

A drive system for a vehicle includes a first planetary gear set, a second planetary gear set directly coupled to the first planetary gear set, a first electromagnetic device directly coupled to the first planetary gear set and including a first shaft, a second electromagnetic device directly coupled to the second planetary gear set and including a second shaft, and an output shaft coupled to the first planetary gear set. The first shaft and the second shaft are radially aligned with the first planetary gear set and the second planetary gear set. The output shaft is radially aligned with the first planetary gear set and the second planetary gear set.

A drive system for a vehicle includes first and second electrical machines, a transmission, and an electrical energy supply. The transmission includes first and second gear sets, a connecting shaft coupled to the first gear set, a driveshaft configured to transport power from the electrical machines to a tractive element of the vehicle, and a clutch. The first gear set is coupled to the first electrical machine. The second gear set is coupled to the second electrical machine. Carriers of the first and second gear sets are coupled. The clutch selectively rotationally couples the carriers to the driveshaft when engaged. The drive system operates in an electric only configuration whereby the electrical energy supply provides electrical energy to at least one of the electrical machines to drive at least one of the connecting shaft and the driveshaft without a mechanical energy input to the transmission from an engine.

A second element fixing clutch is switchable between a released state and an engaged state. In the released state, the second element fixing clutch releases a second element of a planetary gear mechanism so that the second element is rotatable. In the engaged state, the second element fixing clutch fixes the second element of the planetary gear mechanism so that the second element is non-rotatable. A transmission is switchable between at least two modes of a first continuously variable transmission mode, a second continuously variable transmission mode, and a direct mode, by the second element fixing clutch being switched between the released state and the engaged state.

A power-split transmission (28) with a first power path and a second power path. In this case, the first power path is a mechanical power path and includes a primary planetary gearset (P1), a secondary planetary gearset (P2) and a tertiary planetary gearset (P3). Furthermore, the power-split transmission (28) is equipped with at least four shifting elements. In addition, a method for operating such a power-split transmission (28) is disclosed. Moreover, a drive-train (10) of a working machine with a power-split transmission (28) of the type concerned is presented.

A drive system for a vehicle includes a first electromagnetic device directly coupled to a first planetary gear set and a second electromagnetic device directly coupled to a second planetary gear set. In a first mode of operation, a clutch is engaged to couple the second planetary gear set to the first planetary gear set and a brake is disengaged to allow rotation of the second planetary gear set and in a second mode of operation, the brake is engaged to limit rotation of the second planetary gear set and the clutch is disengaged.

A drive system includes a first planetary device, a second planetary device and a connecting shaft directly coupled to the first planetary device, a first electromagnetic device at least selectively coupled to the first planetary device and including a first shaft, a second electromagnetic device directly coupled to the second planetary device and including a second shaft, a clutch positioned to selectively rotationally couple the second shaft to the connecting shaft, and an output shaft coupled to the first planetary device. The first planetary device, the second planetary device, the connecting shaft, the first shaft, the second shaft, and the output shaft are radially aligned. The connecting shaft extends through the second planetary device to the first planetary device. The second electromagnetic device is rotationally engaged with the first planetary device when the clutch is engaged.

In a control device of a vehicle including a first power transmission path transmitting a power through a belt-type continuously variable transmission and a second power transmission path transmitting a power through a reduction gear mechanism in parallel between an input shaft and an output shaft and including a dog clutch in series with the reduction gear mechanism in the second power transmission path, when the dog clutch is in an engagement transition state and a rotational speed change of the output shaft is equal to or greater than a predetermined value, the engagement transition state of the dog clutch is canceled to release the dog clutch.