Method and system for adjusting a minimum driver demand wheel torque
Methods and systems are provided for adjusting driver demand wheel torque of a vehicle. The driver demand wheel torque may be adjusted as a function of a minimum wheel torque. The minimum wheel torque may be determined according to a plurality of torques that may be evaluated in three different phases.
1. A method for operating a vehicle, comprising:
mapping driver demand wheel torque, where the driver demand wheel torque is determined from a driver demand wheel torque input device;
selecting a minimum wheel torque from a plurality of torques;
including the minimum wheel torque in the relationship between the mapped driver demand wheel torque and the driver demand wheel torque request;
adjusting torque of one or more powertrain propulsion sources via a controller as a function of the relationship between the mapped driver demand wheel torque and the driver demand wheel torque request to generate consistent wheel torque; and
generating the consistent wheel torque during vehicle coasting conditions, vehicle creep conditions, and transitions between vehicle coasting conditions and vehicle creep conditions irrespective of which of the one or more powertrain propulsion sources generates the consistent wheel torque.
2. The method of claim 1 , where the one or more powertrain propulsion sources includes an internal combustion engine.
3. The method of claim 2 , where the one or more powertrain propulsion sources include an electric machine.
4. The method of claim 1 , where the minimum wheel torque is a maximum value of the plurality of torques.
5. The method of claim 1 , where the plurality of torques includes a vehicle coasting drivability wheel torque.
6. The method of claim 1 , where the plurality of torques includes a powertrain capable minimum wheel torque.
7. The method of claim 1 , where the plurality of torques includes a creep wheel torque request.
8. The method of claim 1 , where the consistent wheel torque is provided across different powertrain operating modes including where the minimum wheel torque is provided via an internal combustion engine, an electric machine, or a combination of the internal combustion engine and the electric machine.