US 12,241,429 B2
Engine idle speed logic systems and methods
Adam C. McJunkin, Ann Arbor, MI (US); James J. Wallace, Ann Arbor, MI (US); Shigeki Amano, Ann Arbor, MI (US); and Garrett Parker Munson, Milford, MI (US)
Assigned to Toyota Motor Engineering & Manufacturing North America, Inc., Plano, TX (US); and Toyota Jidosha Kabushiki Kaisha, Aichi-Ken (JP)
Filed by TOYOTA MOTOR ENGINEERING & MANUFACTURING NORTH AMERICA, INC., Plano, TX (US)
Filed on Dec. 21, 2022, as Appl. No. 18/069,834.
Prior Publication US 2024/0209808 A1, Jun. 27, 2024
Int. Cl. F02D 41/08 (2006.01); F02D 41/14 (2006.01); F02D 41/16 (2006.01)
CPC F02D 41/083 (2013.01) [F02D 41/086 (2013.01); F02D 41/1401 (2013.01); F02D 41/16 (2013.01); F02D 2041/1433 (2013.01); F02D 2200/021 (2013.01); F02D 2200/503 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method comprising:
determining a state of charge (SOC) of a battery;
determining a maximum output of an alternator at a current idle speed of an engine;
determining a load on the alternator; and
initiating an increased idle speed of the engine based on the determined SOC of the battery and based on the load being greater than the maximum output,
wherein:
the increased idle speed is initiated based on the determined SOC being below an SOC threshold; and
the method further comprises initiating a decreased idle speed of the engine based on the determined SOC being greater than the SOC threshold,
wherein the decreased idle speed is initiated further based on a comparison between a field duty of the alternator and a current demand of an electric cooling fan.