Improvement of the Design of a Microprocessor-Based Power Supply Control System of an Internal Combustion Engine

Abstract

The usage of electronic microprocessor devices in the system of regulating the composition of the fuel mixture makes it possible to increase the efficiency of the ICE. The controller of the control system is not able to determine accurately the air-fuel ratio of the air-fuel mixture by means of an oxygen sensor because of the nonlinearity of its characteristic. The design of a control system with a threshold element is developed, based on the principle of reverse hysteresis. The basis for constructing the automatic control system is the principle of precise regulation of the combustible mixture, depending on the presence of free oxygen and a higher degree of purification of the exhaust gases. Experimental studies of control processes were carried out using a threshold element with conventional and inverse hysteresis. Based on the results of experimental studies, the performance of the lambda probe with the threshold hysteresis element is obtained and its transfer characteristic is justified. The proposed solution has allowed to improve the fuel and economic indicators of ICE and to reduce the concentration of harmful substances in the exhaust gases.