FUEL CONTROL SYSTEM FOR AN INTERNAL COMBUSTION ENGINE

摘要

An i.c. engine fuel control system includes a main fuel control (19) which controls fuel flow to the engine in accordance with one or more engine operating parameters. The operation of the fuel control can be modified by a roughness sensing circuit (11) which produces a roughness signal output dependent on the magnitude of fluctuations of engine speed. This output is applied to an integrator (15) which provides a limited authority trim signal to the fuel control (19) in accordance with the time integral of the error between the roughness signal and a speed-dependent reference signal generated by a speed-shaping circuit (17).