Patent ID: 8467945
Filing Date: 2013-06-18
Classification: B60K,B60W,B60Y,Y10T

Abstract:
1. A constant speed control method for a vehicle, wherein the constant speed control method for a vehicle comprises steps of: examining whether a constant speed switch of the vehicle is pressed or not by an electronic control unit, and allowing the electronic control unit to enter a constant speed mode when the constant speed switch is pressed, wherein before entering the constant speed mode, the electronic control unit examines if a vehicle speed measured by a vehicle speed sensing device is in a predetermined range, and then enters the constant speed mode when the speed is in the predetermined range; and sending a signal by the electronic control unit, so as to lock a throttle locking device for maintaining an opening degree of a throttle valve and to adjust an transmission ratio of an electric continuously variable transmission (ECVT) for maintaining the constant speed driving of the vehicle, wherein the ECVT has a transmission-ratio control motor and a pulley assembly, and the electronic control unit examines if the vehicle speed is higher or lower than a constant speed value, wherein the transmission-ratio control motor adjusts the pulley assembly to a low transmission ratio when the vehicle speed is higher than the constant speed value; or the transmission-ratio control motor adjusts the pulley assembly to a high transmission ratio when the vehicle speed is lower than the constant speed value.