DEVELOPMENT OF A MICROPROCESSOR CONTROL SYSTEM OF GAS ICE WITH SEQUENTIAL GAS FUEL INJECTION

Abstract

The advantage of using alternative gas motor fuels in particular liquefied oil gas by wheeled vehicles, in comparison with traditional liquid motor fuels is shown. The expediency of converting diesel wheeled vehicles into internal combustion gas engines with spark ignition for operation on liquefied petroleum gas has been substantiated. A microprocessor-based gas engine control system has been developed, consisting of two main subsystems and a microprocessor-based electronic control unit. The control system is capable of delivering LPG sequential injection without the need for a traditional camshaft position sensor and a special reference plate mounted on the camshaft. The principle of operation of the main gas engine systems, which include the power supply and injection of liquefied petroleum gas in the inlet nozzle of each cylinder, as well as a modified contactless electronic ignition system with a movable voltage distributor are described. A special «B» level Avenir Gaz 37 microprocessor electronic control unit has been developed and manufactured, which instead of information (signal) from the camshaft position sensor receives information (signal) about the camshaft position from a modified ignition system to implement sequential liquefied petroleum gas injection. Modification of the ignition system is carried out by finalizing the standard drive disk of the distributor. The rework was carried out by increasing the length of the arc of the circle sector of the first cylinder opening. Tests of the gas internal combustion engine of the D-240-LPG-«B» model with the developed microprocessor control system and Avenir Gaz 37 electronic control unit of the «B» level at idle modes for compliance with the requirements of standard 4277 have been performed. The test results showed that the gas engine D-240-LPG-«B» in terms of carbon monoxide and hydrocarbons in the exhaust gases meets the requirements of standard 4277 and has a significantly lower content than the maximum permissible for engines without catalysts.