Closed loop timing and fuel distribution controls

Abstract

Closed loop timing and fuel distribution controls for an internal combustion engine operative to control the timing and fuel delivery to each engine combustion chamber is disclosed herein. The closed loop timing and fuel distribution controls are closed about the instantaneous rotational velocity of the engine's output shaft and generate timing and fuel correction signals operative to modify the timing functions of the engine as well as the quantity of fuel delivered to each of the engine's combustion chambers. The control generates from the crankshaft's instantaneous rotational velocity a profile of each torque impulse imparted to the engine's output shaft and computes the phase angle signal indicative of the phase angle of each torque impulse to generate a timing correction signal indicative of the difference between the computed phase angle signal and a desired phase. The control further distribution computes the torque of each torque impulse and generates a torque correction signal indicative of the difference between the generated torque and average torque values. The two correction signals applied to an engine control modify the timing and fuel control signals being generated to cause the phase angle of the generated torque impulses to occur at the desired phase angle and the fuel delivery to each combustion chamber to be increased or decreased by an amount corresponding to the value of the torque correction signals. The torque corrected fuel delivery signals equalize the torque contribution of each combustion chamber to the total output torque of the engine.