Control system and method
AssigneeJaguar Land Rover Limited
InventorsJonathan Woodley, Andrew Raftry
Life of this patent
Estimating the term…
Abstract
A system comprising a speed controller configured to generate a speed controller powertrain signal in order to cause a powertrain to develop drive torque and cause a vehicle to operate in accordance with a target speed value. The system generates a signal indicative of a rate of acceleration of the vehicle, and is configured to command a powertrain to develop an amount of positive drive torque according to the speed controller powertrain signal in dependence at least in part on the signal indicative of the rate of acceleration of the vehicle.
Claims17
A system comprising:
- a first controller configured to generate a speed control request signal in order to cause a powertrain to deliver a powertrain torque and/or a brake system to deliver a brake torque and cause a vehicle to operate in accordance with a target speed value;
- and
- means for generating a signal indicative of a rate of positive or negative acceleration of the vehicle,
- the system being configured to:
- command the powertrain to deliver an amount of positive powertrain torque or to command the brake system to deliver an amount of brake torque according to the speed control request signal in dependence at least in part on the signal indicative of the rate of acceleration of the vehicle;
- reduce the amount of positive powertrain torque the powertrain is commanded to deliver if the system determines that a rate of positive acceleration of the vehicle exceeds a predetermined threshold value;
- and prevent the first controller from causing the powertrain to deliver positive drive torque if the signal indicative of the rate of acceleration of the vehicle indicates the rate of acceleration exceeds a predetermined value for more than a predetermined time period.
A method of controlling a vehicle, the method comprising:
- generating by means of a first controller a speed control powertrain signal in order to cause a powertrain to deliver a powertrain torque and/or a brake system to deliver a brake torque and cause a vehicle to operate in accordance with a target speed value;
- generating a signal indicative of a rate of positive or negative acceleration of the vehicle,
- commanding the powertrain to deliver an amount of positive powertrain torque or to command the brake system to deliver an amount of brake torque according to the speed control request signal in dependence at least in part on the signal indicative of the rate of acceleration of the vehicle;
- reducing the amount of positive powertrain torque the powertrain is commanded to deliver if the system determines that a rate of positive acceleration of the vehicle exceeds a predetermined threshold value;
- and
- preventing the first controller from causing the powertrain to deliver positive drive torque if the signal indicative of the rate of acceleration of the vehicle indicates the rate of acceleration exceeds a predetermined value for more than a predetermined time period.
Dependencies are inferred from the claim text.