Combine ground speed control system

Abstract From the Canadian patent

A combine harvester having an engine, a traction drive transmission, a header, a threshing and separating mechanism and a machine throughput control system is disclosed wherein a grain loss control loop is operable to produce a signal representative of grain loss and including a grain loss controller to which the grain loss signal and a reference grain loss signal are applied. A grain separation control loop is also provided to produce a signal representative of the grain separation in the machine. The grain loss controller is operable continuously to derive a reference grain separation signal from the grain separation signal, the grain loss signal and the reference grain loss signal. Means …