SIMULATION OF TRACTOR ENGINE OPERATION IN GAS-DIESEL MODE

In modern conditions of fuel use in agriculture, it is necessary to diversify sources and use alternatives to the traditional use of petroleum products. However, there is a pressing issue that is actively being studied regarding the change in power when using a dual-fuel engine power supply system, since there is data on a slight decrease in this indicator, it was also established that the main parameters are preserved, the duty cycle and a significant increase in engine life. The purpose of the study is to simulate the main parameters of the engine in gas-diesel mode. A mathematical model of the duty cycle of the PowerTech 6068HF250 gas-diesel engine of the John Deere 7930 tractor has been created, which makes it possible to establish the operational and technological parameters of its operation. To determine the operating and technological parameters of the tractor engine in gas-diesel mode, for example, determining the LPG gas consumption and the ignition dose of liquid fuel and setting other control points, the thermal calculation of the engine according to the Grynivetsky -Mazing method using the Mathcad environment is informative and relevant. The obtained data were purposefully processed in the Microsoft Excel environment. This method allows to significantly improve the analysis of the operation of diesel engines in gas-diesel mode. When using the mathematical model of the operation of the PowerTech 6068HF250 diesel engine in the Mathcad 14 environment, it was found that the nominal power in the diesel cycle was 3.13% less than the declared engine power by the manufacturer. The obtained data allow us to state the conformity of the model we built. During the next simulation of the engine operation in the gas-diesel cycle, an increase in engine power was detected. An increase in engine power when using a mixture of fuels was also noted. This makes it possible to reduce the dose of consumed gas (LPG) fuel to such an amount that the power was equal to the nominal, which can be observed in the diagrams.