Design of control system for the gas engine with an electronic control unit and sequential fuel injection

Serhii Kovalov,Serhii Plys

doi:10.15587/1729-4061.2022.251993

Serhii Kovalov, Serhii Plys

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https://doi.org/10.15587/1729-4061.2022.251993

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Abstract

This paper reports the results of studying the electronic control system designed for a gas internal combustion engine with spark ignition operated on liquefied petroleum gas. A new feature in the control system is the possibility to provide the most effective sequential type of gas fuel injection, in which fuel is injected in a sequence corresponding to the order of operation of the cylinders. The special feature of the designed control system is that a movable voltage distributor (ignition distributor) of the ignition system was modified to ensure sequential injection. The ignition distributor modification involves installing an additional setting disc with one integrated permanent magnet on its drive shaft and an additional Hall sensor on the body of the ignition distributor. This makes it possible to ensure that the electronic control unit receives a signal about the angular position of the camshaft, thereby enabling consistent fuel injection. The principle of operation of the gas engine control system provided by the electronic control unit has been described. The structure of the modified ignition distributor is shown. Tests of the gas engine with a new control system involving the designed electronic control unit Avenir Gaz 37 "B" and the software module "B2" were carried out. The tests confirmed the feasibility of the designed electronic control system, which implies consistent injection of gas fuel. In addition, idling tests have shown that the carbon monoxide and hydrocarbon content in exhaust engine gases is significantly lower than the maximum allowable for motors without catalysts. The control system designed could be used for converting the diesel vehicles in operation into gas engines. The use of this control system ensures their safe operation.

Highlights

Designing new multifunctional electronic control systems for internal combustion engines (ICEs), especially those operated on alternative environmentally friendly motor fuels, is a way to build environmentally-friendly and energy-efficient vehicles
We have developed algorithms and software that make it possible to control the operation of the gas ICE D-240-liquefied petroleum gas (LPG)-“B”, in particular, its subsystem of multipoint sequential injection of LPG with gas electromagnetic nozzles into the intake pipeline, as well as a subsystem for filling cylinders with the charge of a working mixture (Fig. 6, b)
The results of our study of the electronic control system of the gas engine with spark ignition have demonstrated the possibility of enabling the sequential injection of LPG during the conversion of such diesel engines, whose standard configuration lacks camshaft angular position sensor (CAPS) and a special master disk installed on the camshaft – Fig. 1

Summary

Introduction

Designing new multifunctional electronic control systems for internal combustion engines (ICEs), especially those operated on alternative environmentally friendly motor fuels, is a way to build environmentally-friendly and energy-efficient vehicles. The most expedient way to increase the share of the use of gas fuels is the production of new engine models or the conversion of the diesel engines in operation into gas ICEs with spark ignition [2, 3]. In such gas ICEs, 100 % of the diesel fuel is replaced by cheaper and more environmentally-friendly gas fuel, which can significantly reduce the operating costs of vehicles [4]. Such conversion makes it possible to achieve a high economic effect for those vehicles that have high operating costs related to diesel fuel

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