Excavation machine with constant power output control for torque-converter driven working element

摘要

A controller (616) for crawlers (608,610) of a trencher (100) receives an indication of the speed of an engine (602) and the speed of an output of a torque converter (604) coupling the engine to an excavating element (104,106) for digging a trench. Based on the ratio of the speed ofthe engine and the speed of the output of the torque converter, the controller overrides operator input on the crawlers and stops or slows the trencher when the ratio exceeds a predetermined ranged