Digital computer to determine the ignition angle in a piston engine

摘要

A digital computer for determining the ignition angle in a piston engine using the ratio of two pulse counts with a step-down counter preceding the counter for the denominator of the ratio to further include a multiplication factor corresponding to an additional factor in the ratio. The ratio is determined using adders and flip-flop memories coupled in parallel to both the step down counter and the denominator counter with a carry pulse connection between the step down counter adder and the denominator counter adder. A counter is provided for the numerator of the ratio and a comparator used to compare the outputs of the memories and the numerator counter with operation controlled by a control circuit and the result of the division stored in a result counter.