A Digital Control Algorithm for Diesel Engine Governing

The performance of a microprocessor based precision engine speed control system was investigated. A sample rate selection criteria is presented along with a procedure to implement a high performance digital PID control algorithm. The algorithm requires a digital speed sensor of 12 to 14 bits to minimize excessive fuel rack motion at steady state due to digital quantization effects. Computer simulation and experimental test results of the algorithm are presented for an 1800 RPM, 125 Kilowatt engine generator set.