Signal Processing in the Restructuring of a Computer System Bandpass Frequency-Dependent Component to Eliminate the Internal Combustion Engine Detonation

Abstract

this study considers approaches to eliminate the internal combustion engine detonation, based on signal processing with a specialized computer system. Revealed is the lack of basic solutions for increasing the system efficiency and economy; proposed is to use control system based on the air excess coefficient change. This allowed to reduce hardware costs, overall dimensions, and consequently to reduce the whole system cost. This system main advantages are: versatility, engine increased efficiency and the use of a single bandpass digital filter. The idea of controlling by the air excess ratio changes is as follows. When a detonation occurs, the control system increases the excessive air pressure, this switches the engine into the scarced working mixture mode. Here, there occurs a drop in engine power, which leads to the decreased load on the engine, thus engaging not only the detonation removal, but also the fuel economy and a decrease in CO, NOX and CH. Since the bandpass filter’s main task in signal processing is to recognize the detonation and the engine’s intrinsic noise at different frequencies, formulas to calculate new values for the coefficients of the second-order digital bandpass filter are found. This solution allowed to reduce errors in the operation of the detonation isolation unit at the detonation appearance initial stages, that allows more quickly-making decisions to eliminate unwanted detonation.