Integrated engine torque model
A method of operating a vehicle having at least a driven wheel, the driven wheel driven at least by a driving torque, includes maintaining an inclination angle of the vehicle in memory during a vehicle off condition; after starting the vehicle from the vehicle off condition, first updating a vehicle mass based on operating conditions including vehicle traveling conditions; and after updating the vehicle mass, updating the inclination angle based on operating parameters including vehicle traveling conditions.
1. A method of operating a vehicle having at least a driven wheel, the driven wheel driven at least by a driving torque, comprising:
maintaining an inclination angle of the vehicle in microprocessor memory during a vehicle off condition;
after starting the vehicle from the vehicle off condition, first updating a vehicle mass based on the maintained vehicle inclination angle;
after updating the vehicle mass, updating the inclination angle based on operating parameters including vehicle traveling conditions; and
adjusting engine output based on the updated inclination angle.
2. The method of claim 1 where the updating of vehicle mass is performed without longitudinal acceleration sensor data.
3. The method of claim 1 further comprising adjusting an engine torque estimate in response to the updated vehicle mass and inclination angle.
4. The method of claim 1 wherein updating the inclination angle further includes updating the inclination angle based on the updated vehicle mass.
5. The method of claim 1 wherein updating the inclination angle based on operating parameters further includes updating the inclination angle based on the updated vehicle mass.
6. A method for a vehicle having a wheel driven by engine torque, comprising:
maintaining a vehicle inclination angle in microprocessor memory during a vehicle-off and stopped condition;
after starting the vehicle from the vehicle-off condition, first updating a vehicle mass based on the maintained vehicle inclination angle;
after updating the vehicle mass, updating the inclination angle based on vehicle traveling conditions, and
adjusting engine torque based on the updated inclination angle.
7. The method of claim 6 wherein the vehicle is a passenger vehicle.
8. The method of claim 7 further comprising adjusting vehicle traction control operation based on the updated vehicle mass.
9. The method of claim 6 wherein updating the inclination angle based on the vehicle traveling conditions further includes updating the inclination angle based on the updated vehicle mass.