US 11,988,132 B2
Variable pitch fan control system
Manoj T. Muttepawar, Pune (IN); Nishant Kharche, Pune (IN); Darren J. Cruchelow, Ankeny, IA (US); Jason E. Haubenstricker, Davenport, IA (US); and Scott N. Clark, Bettendorf, IA (US)
Assigned to DEERE & COMPANY, Moline, IL (US)
Filed by DEERE & COMPANY, Moline, IL (US)
Filed on Jun. 2, 2023, as Appl. No. 18/328,443.
Application 18/328,443 is a continuation of application No. 17/301,948, filed on Apr. 20, 2021, granted, now 11,668,228.
Claims priority of application No. 202021022332 (IN), filed on May 28, 2020.
Prior Publication US 2023/0313730 A1, Oct. 5, 2023
Int. Cl. F04D 27/00 (2006.01); B60K 11/06 (2006.01); F01P 5/04 (2006.01); F01P 7/06 (2006.01); F04D 19/00 (2006.01); A01D 69/00 (2006.01)
CPC F01P 5/043 (2013.01) [B60K 11/06 (2013.01); F01P 7/06 (2013.01); F04D 27/00 (2013.01); A01D 69/00 (2013.01); F01P 2025/60 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A fan control system for a variable pitch fan of a work vehicle, the fan control system comprising:
a blade pitch module configured to:
receive a measured parameter of a cooling system of the work vehicle,
determine a current pitch based on the measured parameter, and
adjust a pitch of a plurality of blades of the variable pitch fan based on the current pitch to generate a first airflow in a first direction;
a reversing module configured to command an initial fan reversal that includes instructing the blade pitch module to temporarily adjust the pitch of the plurality of blades of the variable pitch fan to generate a second airflow in a second direction; and
a max pitch module configured to:
determine a maximum blade pitch for the plurality of blades of the variable pitch fan,
determine that the variable pitch fan is operating in a maximum pitch state in response to the current pitch being equal to or greater than the maximum blade pitch,
wherein the reversing module is configured to conditionally command a subsequent fan reversal in response to determining that the variable pitch fan has operated in the maximum pitch state for at least a predetermined period of time.