A machine, such as a dishwasher or clothes washer, incorporates a device for measuring machine load that includes a sensor for detecting power consumption surges. The machine may further include a frame for containing articles, a power utilization system for circulating or distributing a liquid in the...http://www.google.com.au/patents/US5330580?utm_source=gb-gplus-sharePatent US5330580 - Dishwasher incorporating a closed loop system for controlling machine load
