Patent ID: 7867134
Filing Date: 2011-01-11
Classification: B60K,B60L,B60W,Y02T,Y10S,Y10T

Abstract:
1. A control method for improving fuel efficiency of a hybrid electric vehicle comprising the steps of: (a) having an engine control unit prepare for a fuel cut operation by determining whether the fuel cut operation is available and, at the same time, having a hybrid control unit transmit a fuel cut enabling signal to the engine control unit which has completed the preparation of the fuel cut operation, thereby performing the fuel cut operation; (b) having the hybrid control unit determine whether a transmission gear ratio reaches a preset value of gear ratio and, if it reaches the preset value of gear ratio, transmit a fuel cut cancellation signal to the engine control unit, thereby cancel the fuel cut operation; (c) having the engine control unit receiving the fuel cut cancellation signal restart the engine; and (d) having the hybrid control unit perform a reaction control of a motor operating in the opposite direction to engine torque so that the torque being transmitted to a continuously variable transmission is input smoothly.