ABSTRACT
This work analysed the performance of an automatic control system for the online blending of petrol with corrosion inhibitor in the direct, continuous electronic fuel injection automobile engine. The automatic control system was designed by superimposing a feedforward control system on a feedback control system. The design of the automatic control system was analysed by the method of direct substitution. The governing equations used in analysing the blending process, as well as the applicable equations which modelled the process disturbance were derived from first principles – using transfer functions and block diagram representations. The performance of the automatic control system was simulated with the aid of computer software; and the results obtained from the simulation showed that the response of the automatic control system is oscillatory and stable.