Vehicle and method of controlling a vehicle

摘要

A motor vehicle having: prime mover means; at least first and second groups of one or more wheels; and a driveline to connect the prime mover means to the first and second groups of one or more wheels such that the first group of one or more wheels may be driven by the prime mover means when the driveline is in a first mode of operation and the second group of one or more wheels may additionally be driven by the prime mover means 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 one or more wheels to a torque transmission path from the prime mover means 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.

主权项

1. A motor vehicle having:
a prime mover; at least first and second groups of one or more wheels; and a driveline to connect the prime mover to the first and second groups of one or more wheels such that the first group of one or more wheels may be driven by the prime mover when the driveline is in a first mode of operation and the second group of one or more 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 one or more 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 from the second mode to the first mode in dependence on a value of a prescribed vehicle operating temperature, wherein the control means is arranged to prevent a transition from the second mode to the first mode when the value of the prescribed vehicle operating temperature is below a first prescribed value, and the control means is operable to prevent a transition from the first mode to the second mode and from the second mode to the first mode when the value of the prescribed vehicle operating temperature is below a third prescribed value, the third prescribed value being lower than the first prescribed value.