| 摘要 |
<p>A determination of successive differences in phase between engine speed indicative signals from an engine encoder (29, 31) and a master reference signal provides control for fuel flow to the respective engines (25, 27). Counters (20, 22) for counting pulses in the reference pulse train and the engine speed pulse train over a predetermined time interval as well as counters (24, 26) for determining the time between the last pulse of the reference pulse train counted during the predetermined interval and the end of that time interval and the time between the last pulse of the engine speed pulse train counted during the predetermined time interval and the end of that time interval are included in the circuitry. The frequencies of the reference and speed indicative pulse trains along with the values stored in the counters form the inputs to a phase difference computing circuit which computes the average phase difference between the reference and the speed indicative pulse trains over the predetermined time interval. A fuel regulator is responsive to the phase difference computing circuit for controlling the flow of fuel to the engine to modify the speed of that engine to bring it into closer conformity with a speed indicated by the frequency of the reference pulse train. One engine may provide the reference signal, or an independent reference signal may be generated and each engine (25, 27) may be provided with an encoder (29, 31), first, second, third and fourth counters (20, 22, 24, 26), means for computing, phase difference computing means, and all engines may be provided with fuel control circuits.</p> |
