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Method and apparatus for reducing engine cycling in hybrid electric vehicle

  • US 6,624,527 B1
  • Filed: 09/15/2000
  • Issued: 09/23/2003
  • Est. Priority Date: 09/15/2000
  • Status: Active Grant
First Claim
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1. A method of reducing the number of times a main power unit of a hybrid electric vehicle is activated to support a plurality of auxiliary system of the vehicle during a given drive cycle comprising a sequence of the following steps:

  • determining the ON/OFF status of said unit;

    if the unit is ON requesting that the unit be maintained ON until the value of an auxiliary system parameter exceeds a first threshold value wherein said first threshold value is a unit ON auxiliary system threshold value;

    if the unit is OFF requesting that the unit be turned ON when the value of said parameter falls below a second threshold value wherein said second threshold value is a unit OFF auxiliary system threshold value;

    setting said unit OFF auxiliary system threshold value when the status of said unit is OFF;

    setting said unit ON auxiliary system threshold value when the status of said unit is ON; and

    wherein said step of requesting that a unit ON status be maintained is performed if a predetermined parameter in any of said plurality of auxiliary systems is below respective unit ON auxiliary system threshold values, and said step of requesting a unit ON status is performed if a predetermined parameter in any of said plurality of auxiliary systems is below respective unit OFF auxiliary system threshold value.

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