Variable pitch fan pitch limit

A method for controlling the pitch of a variable pitch fan assembly, comprising:

• providing a fan hub, a plurality of blades extending radially from the fan hub, and a controller in communication with the fan assembly to reposition a pitch of the plurality of blades;
• identifying, with the controller, a variable maximum pitch of the plurality of blades based on an ambient temperature, the variable maximum pitch being the greatest angle of the pitch allowed by the controller based on the ambient temperature;
• establishing, with the controller, a desired pitch by monitoring at least one vehicle system, the desired pitch being any pitch of the plurality of blades at or between the maximum pitch and a minimum pitch;
• and
• adjusting a pitch angle of the plurality of blades, with the controller, to the desired pitch;
• wherein, the desired pitch is the pitch that provides the least resistance to the fan assembly while lowering or maintaining a temperature or pressure of the at least one vehicle system.

A work machine, comprising:

• an engine;
• a vehicle system;
• a fan assembly having a fan hub with blades that have a pitch angle that is repositionable;
• and
• a controller in communication with the fan assembly and the vehicle system to reposition the pitch angle of the blades;
• wherein, the controller establishes a variable maximum pitch of the plurality of blades based on an ambient temperature, the variable maximum pitch being the greatest angle of the pitch allowed by the controller based on the ambient temperature;
• wherein, the controller establishes a desired pitch that is any pitch at or between a minimum pitch and the variable maximum pitch based on the at least one vehicle system and orients the pitch angle of the blades to the desired pitch, the desired pitch being the pitch that provides the least resistance to the fan assembly while lowering or maintaining a temperature or pressure of the vehicle system.