| 摘要 |
<p>A motor vehicle has a prime mover 11; at least first 12, 13 and second 14, 15 groups of one or more wheels and a driveline connecting the prime mover means to the first and second groups of wheels such that the first group of wheels may be driven by the prime mover when the driveline is in a first mode of operation and the second group of wheels may additionally be driven by the prime mover when the driveline is in a second mode of operation, the driveline including an auxiliary portion comprising releasable torque transmitting means operable to connect the second group of wheels to a torque transmission path from the prime mover when the driveline transitions between the first mode and the second mode, the vehicle comprising control means operable automatically to control the driveline to transition from the first mode to the second mode and from the second mode to the first mode, the control means being operable to prevent a transition from the first mode to the second mode and/or from the second mode to the first mode in dependence on a value of a prescribed vehicle operating temperature.</p> |
