Control systems for a vehicle powertrain
AssigneeJaguar Land Rover Limited
InventorsRomain LACROISILLE, Olivier ROQUES, Matt SULLIVAN, Vladimir BARANCHIKOV
Life of this patent
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Abstract
Aspects of the present invention relate to a control scheme for controlling a vehicle where an upshift of the vehicle is anticipated and where preparation for the upshift has begun. A power source of the vehicle is arranged to generate a torque in dependence on a predicted driver torque demand, in dependence on a normalised torque demand and an indicated torque ratio of the gearbox after the expected upshift of the gearbox.
Claims9
A control system for controlling a powertrain of a vehicle, the powertrain comprising a power source and a drivetrain arranged to receive torque from the power source, the drivetrain comprising a gearbox and a torque converter, the control system comprising one or more processors, the one or more processors collectively configured to:
- receive a gear change signal indicative of an expected upshift of the gearbox, the gear change signal comprising an indication of a torque ratio of the gearbox after the expected upshift of the gearbox;
- receive a driver torque demand signal, the driver torque demand signal comprising a driver torque demand;
- receive a torque convertor slip value signal, the torque convertor slip value signal comprising a torque converter slip value;
- receive a predicted input shaft speed signal, the predicted input shaft speed comprising a predicted input shaft speed of the gearbox after the expected upshift of the gearbox;
- determine a normalised torque demand in dependence on the driver torque demand, the torque converter slip value, and the predicted input shaft speed;
- determine a predicted driver torque demand in dependence on the normalised torque demand and the torque ratio of the gearbox after the upshift;
- and
- output a first output signal, the first output signal requesting the power source to generate a torque in dependence on the predicted driver torque demand.
A method for controlling a drive system of a vehicle, the method comprising:
- receiving a gear change input signal indicative of an upshift in the gearbox, the gear change input signal comprising an indication of a torque ratio of the gearbox after the expected upshift of the gearbox;
- receiving a driver torque demand signal, the driver torque demand signal including a driver torque demand receiving a torque converter slip value signal, the torque converter slip value signal including a torque converter slip value;
- receiving a predicted input shaft speed signal, the predicted input shaft speed signal including a predicted input shaft speed of the gearbox after the expected upshift of the gearbox;
- determining a normalised torque demand in dependence on the driver torque demand, the torque converter slip value, and the predicted input shaft speed;
- determining a predicted driver torque demand in dependence on the normalised torque demand and the indicated torque ratio of the gearbox after the expected upshift of the gearbox;
- and
- outputting a first output, the first output signal being arranged to cause a power source of the vehicle to generate a torque in dependence on the predicted driver torque demand.
Dependencies are inferred from the claim text.