Method for Measuring Air Efficiency and Efficacy in a Combine Harvester

A method of managing the airflow of a blower mechanism through the threshing and cleaning systems of a combine harvesting machine, the method comprising:

• calculating a G factor at a first point on an upper chaffer that is just underneath the forward edge of a grain pan to determine if the G factor at said first point is greater than 1+n, where n represents a desired factor;
• adjusting the blower mechanism to cause a reduction in the rearward movement of grain if the G factor at said point is greater than 1+n;
• calculating a MOG factor is calculated at said first point if the G factor calculated at said point is less than 1+n;
• adjusting the blower mechanism to increase the airstream so as to entrain more MOG if the MOG factor at said first point is less than 1+x, where x represents a desired factor;
• calculating a MOG factor at a second point if the MOG factor at said first point is greater than 1+x;
• adjusting the blower to reduce the airstream if it is determined the MOG factor at said second point is greater than 1+y, where y represents a desired factor;
• and
• adjusting the blower to increase the airstream if it is determined the MOG factor at said second point is less than 1+y.