March 31, 2015 
Compared to a conventional AC generator which operates at fixed a speed; a variable speed DC generator uses variable governing which reduces fuel consumption by up to 40% while operating under light electrical loads by adjusting engine speed based on demand. GAC’s EAM208 is an accessory module that provides an output voltage proportional to power based on the current from a variable speed DC generator and provides the signal to the governor. Combined with the EDG6000 governor, the setup is proven to be an easily configurable, digital system for maximum fuel savings. Typical applications include military and the telecommunications market. The EDG has customization across the entire speed and load range for perfect performance under all operating conditions, and can be directly applied to any make of engine.
A PID is an adjustable control loop feedback mechanism that maintains engine stability during load changes. During engine governing, a PID controller senses the actual engine speed and compares it to the desired engine speed. The readings are then used by GAC’s PID algorithm, commanding the actuator to compensate for either the lack of speed or the abundance of speed. The “P” term (Proportional), also known as Gain, is responsible for calculating present errors in engine speed and is the immediate response (not time dependent). The “I” term (integral), also known as Stability, calculates past errors. The “D” term (Derivative), also known as Deadtime, predicts future errors. GAC’s PID is a trade secret developed over 28 years and thousands of applications. When strict standards are required, an electronic or digital GAC governor designed with a PID will out-perform a mechanical governor every time.