Determination rate of fuel consumption of gas cars for warm up in low operating temperatures

Abstract

Ukraine faces an acute problem of rational use of energy resources. Automobile transport is the main consumer of petrol, diesel fuel and liquefied petroleum gas, but most of the raw materials imported. Gas consumption in the road transport of Ukraine is equal to the consumption of gasoline, and vehicles with a power supply system installed on liquefied or compressed gas is 25%. The conditions for burning gas are somewhat different from gasoline or diesel fuel, which must be taken into account to evaluate the fuel efficiency of a car.The technique of rationing of fuels and lubricants in Ukraine has a number of drawbacks: there are no values ​​for basic fuel consumption rates for a significant number of car brands, the design features of vehicles and the type of fuel system are not taken into account, there are no fuel consumption rates for one launch and engine warming up taking into account the actual ambient temperature.Extend the possibilities and eliminate the disadvantages of this technique in the article proposed by using mathematical modeling of fuel economy of the car. The method of calculating the fuel consumption name prof. Govorushchenko N.Ya. it the basis for the calculation model The article obtained analytical dependencies for the calculation of fuel consumption for vehicles with different fuel systems, including cars that have gas equipment installed. A new model for calculating fuel consumption for starting and warming up the engine, taking into account the ambient temperature, has been obtained. For the SKODA Octavia car (1.6l), examples of the calculation of the base rate of fuel consumption when the engine is running on diesel, petrol, and liquefied petroleum gas are given. The calculated values ​​of the liquid fuel consumption correspond to the data of the manufacturer, and the result is between the urban and mixed test cycle. Estimated consumption of gaseous fuel is 2 times less than the standard value specified in the methodology of the Ministry of Transport of Ukraine. It was calculated fuel consumption rate required to start and warm up the engine in the cold period of operation of the vehicle. The mathematical model takes into account: the design of the car, fuel properties, mode of operation, external factors. Tabular and graphical dependences are obtained for the rationing of fuel consumption at different values ​​of the ambient temperature. The SKODA Octavia (1.6l) car spends about 90 ml of gasoline at air temperature 0 °С and more than 130 ml when the temperature is -20 °С. The system of fuel consumption rationing in Ukraine takes into account only 1-3 cycles of starting and warming up an automobile engine per day. In case of intensive operation with frequent and long stops, the hole in the vehicle's fuel consumption must be increased. Within a month, the total fuel consumption for starting and warming up the engine of SKODA Octavia can be about 25 liters (when working in one shift, 30 days, 6 engine starts per shift, air temperature -20 °С)The developed mathematical model and the obtained analytical dependencies can be used at motor transport enterprises for rationing fuel consumption when there are no other sources of information.