Patent ID: 8112214
Filing Date: 2012-02-07
Classification: B60K,B60W

Abstract:
1. A speed-limited powertrain for a vehicle, comprising: a motor that develops torque for propelling the vehicle; a speed sensor that generates a speed signal based on a speed of the vehicle; and a control module that (i) generates a first torque signal based on a difference between a predetermined maximum speed of the vehicle and a speed of the vehicle, wherein the predetermined maximum speed of the vehicle is a maximum speed that the vehicle can safely travel, (ii) generates a second torque signal based on the vehicle speed and an aerodynamic drag coefficient of the vehicle, and (iii) generates a torque control signal based on a sum of the first and second torque signals, wherein the torque control signal is adapted to control an output torque of the motor and the output torque of the motor is related to an axle torque by a gear ratio.