Patent ID: 9656574
Date: 2017-05-23
CPC Classifications: B60L,G07C,H02P,Y02T

Claim:
1. A method for determining a direction of movement of an electric vehicle, the method comprising: determining a direction of rotation of a motor shaft based on a signal from a rotational speed sensor; determining a direction of torque on the motor shaft based on a signal from a torque sensor; determining a currently selected operating gear of the electric vehicle; receiving a wheel speed value from at least one wheel speed sensor; determining that the electric vehicle is moving forward and setting a forward latch flag when the currently selected operating gear is a forward drive gear and the direction of rotation of the motor shaft and the direction of torque on the motor shaft are the same; comparing the wheel speed value from the at least one wheel speed sensor to a threshold; clearing the forward latch flag when the wheel speed value from the at least one wheel speed sensor is less than the threshold; and determining that the electric vehicle is moving forward when the currently selected operating gear is the forward drive gear, the direction of rotation of the motor shaft and the direction of torque on the motor shaft are not the same, and the forward latch flag is already set.