Methods and system for operating a torque vectoring electric machine
Methods and systems are provided for operating a vehicle that includes a torque vectoring electric machine. In one example, torque output of a torque vectoring electric machine is adjusted to reduce driveline torque disturbances when the torque vectoring electric machine is activated. The torque output is adjusted in response to a speed difference between a wheel speed and a speed of the torque vectoring electric machine.
1. A vehicle operating method, comprising:
adjusting torque output of a torque vectoring electric machine via a controller according to a speed difference between a wheel speed determined via a wheel speed sensor and a speed of the torque vectoring electric machine.
2. The method of claim 1 , where the actual wheel speed is determined via a wheel speed sensor.
3. The method of claim 1 , where the torque vectoring electric machine speed is determined via a resolver.
4. The method of claim 1 , further comprising dividing the speed of the torque vectoring electric machine by a gear ratio.
5. The method of claim 1 , where the torque vectoring electric machine is arranged in parallel with a propulsive force electric machine.
6. The method of claim 5 , further comprising adjusting torque output of the propulsive force electric machine based on a requested wheel torque.
7. The method of claim 1 , further comprising delivering torque output of the torque vectoring electric machine to an open differential or a planetary gear set.
8. The method of claim 1 , further comprising deactivating the torque vectoring electric machine when wheel slip is not detected.
9. A vehicle operating method, comprising:
adjusting torque output of a torque vectoring electric machine via a controller according to a speed difference between a left wheel speed determined via a wheel speed sensor and a speed of the torque vectoring electric machine.
10. The method of claim 9 , further comprising adjusting torque output of the torque vectoring electric machine via the controller according to a speed difference between an actual right wheel speed and the speed of the torque vectoring electric machine.
11. The method of claim 10 , further comprising dividing the speed of the torque vectoring electric machine by a gear ratio.
12. The method of claim 11 , further comprising activating the torque vectoring electric machine in response to wheel slip.
13. The method of claim 12 , further comprising multiplying the speed difference between an actual left wheel speed and a speed of the torque vectoring electric machine by a proportional gain factor.
14. The method of claim 9 , further comprising adjusting a torque of a propulsive electric machine responsive to a driver demand wheel torque.
15. The method of claim 14 , where the propulsive electric machine is coupled to the torque vectoring electric machine via two gear sets that are spaced apart along an axle.