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Control method for improving fuel efficiency of hybrid electric vehicle

  • US 20090105926A1
  • Filed: 12/28/2007
  • Published: 04/23/2009
  • Est. Priority Date: 10/17/2007
  • Status: Active Grant
First Claim
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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.

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