Patent US 4,100,731

An electronic control for a multi-engine gas turbine installation includes two channels each containing a low wins gate with a signal error input and an acceleration limit input, the output of the low wins gate being applied via a high wins gate to an electronic integrator the output of which is compared with a speed signal to provide fuel control for speed governing. For balancing the two channels a difference amplifier provides an output containing information related to the output of one or other low wins gate and the difference between the values of a given parameter of each engine. This acts to control this difference both during steady running and acceleration.