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US 9,630,493 B2Granted
Vehicle and method of controlling a vehicle
AssigneeJaguar Land Rover Limited
InventorsPete Stares, David Clare
Life of this patent
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AssigneeJaguar Land Rover Limited
InventorsPete Stares, David Clare
Estimating the term…
A motor vehicle having: a prime mover; first and second groups of wheels; and a driveline operable by a controller to connect a torque transmission path from the prime mover to the wheels. The driveline connects the second group to the torque transmission path by an auxiliary portion including first and second releasable torque transmitting devices and a prop shaft. The controller operates the auxiliary portion to switch the driveline between first and second modes such that in the first mode the prop shaft is disconnected from both the torque transmission path and second group of wheels. The driveline transitions from the first mode to the second mode responsive to a value of a vehicle operating parameter, and when a transition to the second mode is made the vehicle is operable not to transition back to the first mode from the second mode before a disconnect delay period has expired.
A motor vehicle having:
A method of controlling a motor vehicle driveline to transition between first and second modes of operation, in the first mode of operation a prime mover means of the vehicle being arranged to drive a first group of one or more wheels and not a second group of one or more wheels, in the second mode of operation the prime mover means being arranged to drive the first group of one or more wheels and the second group of one or more wheels, preventing a transition to the first mode from the second mode unless an at least one vehicle operating parameter has no value corresponding to a condition for the second mode to be assumed during a period of time not less than a disconnect delay period, wherein the timing of the period of time is commenced only when the driveline is in the second mode,
A system for a vehicle having a driveline comprising a prime mover, at least a pair of rear wheels, a shaft for connecting the prime mover to the rear wheels and first and second coupling means for selectively connecting the prop shaft to the prime mover and to the rear wheels, respectively, the system comprising control means configured to control operation of the first and second coupling means in one of a first mode of operation, in which the prop shaft is disconnected from both the prime mover and the rear wheels, and a second mode of operation, in which the prime mover is connected to the rear wheels by the prop shaft, the control means being arranged to prevent transition from the second mode of operation to the first mode of operation unless an at least one vehicle operating parameter has no value corresponding to a condition for the second mode to be assumed during a period of time not less than a disconnect delay period, wherein the timing of the period of time is commenced only when the driveline is in the second mode.
Dependencies are inferred from the claim text.