Grain tank unloader and clean out control

A method for unloading grain from a grain tank of an agricultural combine, comprising the steps of:

• providing an elongate unloader conveyor including an enclosed housing having an inlet end including an opening for receiving grain, an opposite outlet end including a discharge opening through which the grain can be discharged, an elongate unloader conveyor element extending through the housing between the ends and operable for conveying the grain through the housing from the inlet end and discharging the grain through the discharge opening, the unloader conveyor being pivotable between a stored position beside the combine and an unloading position extending sidewardly therefrom in cantilever relation thereto, and an unloader drive operably controllable for operating the conveyor element;
• providing an elongate grain tank conveyor disposed in a bottom region of the grain tank operable for conveying grain therefrom into the opening of the inlet end of the unloader conveyor, and a device operably controllable for operating the grain tank conveyor;
• providing a controller operable for controlling the unloader drive and the device;
• receiving an unload command by the controller, whereby the controller initiates operation of the unloader drive before initiating operation of the device;
• operating the unloader drive when the unloader conveyor is in the unloading position, such that the unloader conveyor will commence conveying grain away from a bottom region of the housing adjacent the inlet end so as provide capacity in the inlet end for a smooth transition of grain from the grain tank conveyer to enter the inlet end;
• opening through which the grain can be discharged, an elongate unloader conveyor element extending through the tubular housing between the ends and operable for conveying the grain through the tubular housing from the inlet end and discharging the grain through the discharge opening, a grain tank conveyor extending into the inlet opening from a bottom region of the grain tank and operable for conveying grain from the grain tank into and through the inlet opening into the tubular housing, and a controller for controllably operating the unloader conveyor and the grain tank conveyor, the method comprising the steps of:
• operating the unloader conveyor before operating the grain tank conveyor when an unload command is received by the controller, in order to commence conveying grain in the inlet end thereof toward the outlet end to remove grain from a bottom region of the housing and provide capacity in the inlet end for smooth transition of grain from the grain tank conveyer into the inlet end
• initiating operation of the device by the controller after the unloader conveyor has removed grain from the bottom region of the housing in order to avoid grain to grain grinding and compaction that would otherwise occur if the grain tank conveyor and the unloader conveyor were simultaneously initiated;
• and
• operating the grain tank conveyor for conveying grain into the inlet end of the unloader conveyor.