| 摘要 |
A system comprises a speed controller generating a powertrain signal for causing a powertrain to develop drive torque and cause a vehicle to operate in accordance with a target speed value. The system commands the powertrain to develop an amount of positive drive torque or brake torque according to the powertrain signal in dependence at least in part on a signal indicative of the rate of acceleration of the vehicle or in dependence on a torque threshold having been increased or in dependence on a state of a first of two controllers. Excess acceleration during control by a low speed progress controller (12 see fig 3) is corrected by a reduced torque request step S107. The invention addresses a situation wherein speed or cruise control is required whilst speeds may need to be subjected to significant variation, for instance at low speeds. |
