A clutch control device is provided for a four-wheel drive vehicle. The clutch control device is able to suppress the elevation of the temperature of the oil supplied to a friction clutch during two-wheel drive travel when the friction clutch is released. The clutch control device includes a dog clutch and an electronic control coupling. The friction clutch is housed in a coupling case. When the dog clutch and the friction clutch are released, a two-wheel drive mode is selected. The coupling case has a passage opening that is closed to retain lubrication oil in an oil chamber with respect to a clutch chamber that houses the friction clutch. When oil stirring conditions are met thereafter, the passage opening is opened and the lubrication oil is allowed to flow into the clutch chamber from the oil chamber.

A transfer case includes a housing, along with an input shaft, a primary output shaft, a secondary output shaft, and a secondary torque transfer mechanism, each disposed at least partially within the housing. The input shaft is configured to couple to the primary output shaft to transfer torque thereto. The secondary torque transfer mechanism includes a rotating member coupled to the secondary output shaft and a locking mechanism. The locking mechanism includes a locking ring, a fork member engaging the locking ring, and a slide shaft coupled to the fork member and configured to slide the locking ring to positively couple the primary output shaft to the rotating member to transfer torque to the secondary output shaft. The housing includes an aperture axially configured to receive an elongated tool configured to be rotated manually external to the housing for engaging and moving the slide shaft to the second position.

A transfer case includes a housing, along with an input shaft, a primary output shaft, a secondary output shaft, and a secondary torque transfer mechanism, each disposed at least partially within the housing. The input shaft is configured to couple to the primary output shaft to transfer torque thereto. The secondary torque transfer mechanism includes a rotating member coupled to the secondary output shaft and a locking mechanism. The locking mechanism includes a locking ring, a fork member engaging the locking ring, and a slide shaft coupled to the fork member and configured to slide the locking ring to positively couple the primary output shaft to the rotating member to transfer torque to the secondary output shaft. The housing includes an aperture axially configured to receive an elongated tool configured to be rotated manually external to the housing for engaging and moving the slide shaft to the second position.

A drive system for a vehicle for variable distribution of torque, from a primary input and secondary input, between a left wheel and a right wheel of a vehicle, the drive system includes a first and second torque output shaft, one for each of the left wheel and the right wheel, an open differential, and independently controllable first and second clutch packs, configured such that: torque from the primary input is transferred to each of the torque output shafts via the clutch packs; torque from the secondary input is transferred to each of the torque output shafts via the open differential; torque from one output of the open differential is summed with torque from one clutch pack output in the first torque output shaft; and torque from another output of the open differential is summed with torque from the other clutch pack output in the second torque output shaft.

A system includes a processor configured to automatically engage all wheel drive (AWD) when a vehicle reaches areas along a route that were previously flagged as slippery, in a memory in communication with the processor. The flagging may have occurred, for example, based on existence of unpaved roads or precipitation at those areas.

In a control system, a transfer is connected to a rotation member between a driving power source and primary driving wheels and distributes dynamic power of the driving power source to secondary drive wheels. A driving power transmission shaft transmits the dynamic power of the driving power source distributed by the transfer to the secondary drive wheels. A connection-disconnection mechanism is disposed between the rotation member and the driving power transmission shaft. First and second clutches are disposed respectively between the driving power transmission shaft and right and left wheels of the secondary drive wheels. The electronic control unit is configured, when switching from a two-wheel-drive running state to a four-wheel-drive running state on the basis of a vehicle running state, to generate a transmission torque in the first clutch or the second clutch after controlling the connection-disconnection mechanism to engage the connection-disconnection mechanism.

Embodiments of the present invention provide an electric machine control system for a vehicle, the electric machine control system comprising one or more controllers, wherein the vehicle comprises an electric machine arranged to be selectively coupleable to provide torque to at least one wheel of an axle of the vehicle, the control system comprising input means to receive a speed signal indicative of a speed of the vehicle, processing means arranged to determine a desired coupling state (525) of the electric machine to the at least one wheel of the axle in dependence on the speed signal, wherein the processing means is arranged to determine the desired coupling state as coupled in dependence on the speed signal being indicative of a vehicle speed equal to or below a first low-speed threshold (910) and to determine the desired coupling state as no-request in dependence on the speed signal being indicative of a vehicle speed above a second low-speed threshold (920), wherein the second low-speed threshold represents a vehicle speed greater than the first low-speed threshold, and output means arranged to output a coupling signal indicative of a request to couple the electric machine to the at least one wheel of the axle in dependence on the desired coupling state being coupled.

An electric delivery truck control system is disclosed. Sensors detect hub motor parameters associated with the hub motors. An electric delivery truck control unit detects electric delivery truck control inputs associated with an operation of the electric delivery truck. The electric delivery truck control inputs are generated from an operation of the electric delivery truck. An operation parameter controller automatically adjusts a torque level applied by each hub motor of the electric delivery truck to be within a hub motor operation threshold based on the hub motor parameters thereby enabling each hub motor to operate at an operation torque level as requested from the operation of the electric delivery truck. The operation parameter controller maintains the torque level applied by each hub motor within a current limit allowed by a battery management unit of the electric delivery truck and a torque limit allowed by each hub motor.

Provided are a vehicle such that drive state can be suitably selected in a configuration including an internal combustion engine, and a vehicle control method. In a vehicle and a method of controlling the same, different values are set for a first switching threshold value for switching from a first independent drive state (in which one of a front wheel and a rear wheel is driven) to a combined drive state, and for a second switching threshold value for switching from a second independent drive state (in which the other of the front wheel and the rear wheel is driven by an internal combustion engine) to the combined drive state.

A clutch control device is provided for a four-wheel drive vehicle. The clutch control device is able to suppress the elevation of the temperature of the oil supplied to a friction clutch during two-wheel drive travel when the friction clutch is released. The clutch control device includes a dog clutch and an electronic control coupling. The friction clutch is housed in a coupling case. When the dog clutch and the friction clutch are released, a two-wheel drive mode is selected. The coupling case has a passage opening that is closed to retain lubrication oil in an oil chamber with respect to a clutch chamber that houses the friction clutch. When oil stirring conditions are met thereafter, the passage opening is opened and the lubrication oil is allowed to flow into the clutch chamber from the oil chamber.