| 摘要 |
<p>A vehicle control system and method are provided. The control system is operable to cause a vehicle to operate in accordance with a target speed value by controlling an amount of brake torque applied by a braking system 22 and an amount of drive torque applied by a powertrain 129 to one or more wheels 111, 112, 114, 115 of a vehicle 100. When the system is causing a vehicle to operate in accordance with the target speed value the system is operable automatically to cause vehicle speed not to exceed a limit value by means of the braking system 22 if the powertrain 129 assumes a torque suspension mode which is a mode in which the powertrain 129 is prevented temporarily from delivering drive torque to an input portion of a ratio selection portion of the powertrain 129, the ratio selection portion being a portion through which a transmission of the powertrain 129 is operable to deliver drive torque to one or more wheels 111, 112, 114, 115 of the vehicle 100. The ratio selection portion is operable in a plurality of different respective operating modes in each of which a different respective gear ratio is provided between an input portion and an output portion thereof.</p> |
