Abstract
The expediency of converting vehicles diesel engines into gas internal combustion engines with spark ignition has been substantiated. The advantages of using gas motor fuels, in particular, liquefied petroleum gas, are shown. Methods of supply and types of injection of liquefied petroleum gas into the inlet pipeline of a gas engine are analyzed. It is shown that the simplest way to convert diesel engines to gas engines is to equip the engine with a power supply subsystem and supply of liquefied petroleum gas to the inlet pipeline through a gas-air mixer in combination with the use of a contactless electronic ignition subsystem with a movable voltage distributor. Such re-equipment is qualified as the first level of complexity, that is, level "A". To limit the maximum gas engines speed equipped with two subsystems according to level "A", an electronic microprocessor control unit Avenir Gaz 37 "A" has been developed and manufactured. The principle of operation of the Avenir Gaz 37 "A" control unit is described. Tests of the D-240-LPG-"A" gas engine with the electronic control unit Avenir Gaz 37 "A" were carried out, which confirmed its performance. It is shown that the second level of complexity of converting diesels into gas engines corresponds to the equipment of the engine with an accumulative power supply subsystem and multi-point group or sequential injection of liquefied petroleum gas (Common Rail type) in combination with the use of a contactless electronic ignition subsystem with a movable voltage distributor and a subsystem for controlling the filling of cylinders with the charge of the working mixture. This method of converting is qualified as the second level of complexity, that is, level "B". For the operation of gas engines equipped with three subsystems according to level "B", an electronic microprocessor control unit Avenir Gaz 37 "B" has been developed and manufactured. The principle of operation of each of the three subsystems equipped with D-240-LPG-"B" gas engine is described. The tests of the D-240-LPG-"B" gas engine with the Avenir Gaz 37 "B" control unit were carried out, which confirmed its performance.
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