Among the factors affecting the fuel economy of freight cars, the formula can tell that the fuel economy of automobiles is mainly affected by the specific fuel consumption of the engine, the power consumption of the engine and the speed of the car. The specific fuel consumption of the engine is closely related to the type, quality, merits and demerits, and load factor of the engine. The most important determinant of fuel consumption is the load factor. The most ideal pair to drink is 80% to 90%, too high and too low load will increase fuel consumption.
The engine principle of the car is that the engine constantly overcomes the resistance of the car, the air resistance, the resistance of the road and the resistance caused by the acceleration. The engine's momentum balance equation is that in this balanced equation, Ne is the output power; for the engine transmission efficiency, Pf is the rolling resistance power; PW is the air resistance power, Pi is the gradient resistance power, and Pj is the acceleration resistance power; Gravity acceleration; G is the total mass of the car; f is the coefficient of rolling resistance; Va is the speed; i is the slope of the road; CD is the coefficient of air resistance; A is the area of ​​the car facing; The principle is that the power consumption of the engine is proportional to the gradient of the car and the rolling resistance of the acceleration resistance. The greater the quality of the car, the greater the loss, and the greater the loss of fuel.
Through the research of the formula, the analysis of the number is carried out to find out the specific fuel consumption and the vehicle speed of the engine. The total mass of the vehicle has a direct relationship. When the fuel consumption ratio and the transmission coefficient are fixed, the main effect is the total mass and speed of the vehicle. Therefore, we can analyze the impact of vehicle quality and vehicle speed on fuel consumption through bench tests. According to the calculation formula, we can see the engine losses of different speeds and different total masses of the vehicle. According to the calculation data of the vehicle speed and vehicle mass, the engine is obtained. Speed ​​and power. Then simulate the fuel loss test of the car running on the road.
The total mass and speed of the vehicle during the operation of the vehicle have a great influence on the loss of the fuel, so the value of the vehicle's no-load and full-load fuel consumption is taken as the basic value. The vehicle was tested for fuel consumption at constant speed under the no-load and full-load scenario, and tested for fuel consumption at five vehicle speeds.
Because in actual operation, the car often accelerates and decelerates, and climbs downhill, it cannot be a full constant speed. Therefore, it distinguishes urban road conditions, inter-city highway conditions, and freeway conditions. In order to fully derive the fuel consumption of the car due to the road, these three different status weightings were respectively introduced in the calculation.
When calculating, according to the vehicle's operating conditions, according to the following formula, the consumption of car formic acid in different operating conditions, QK and full load consumption Qm, and then calculate the additional fuel consumption according to the formula. Because the actual operation will encounter different practical problems, we introduce non-coefficient k.
Conclusion The calculation of the fuel consumption of freight cars is calculated from the above calculation formula and test method. This article analyzes and studies the characteristics of freight cars, scientifically adopts engine tests to simulate the road conditions of automobiles, and has more calculation methods for the fuel consumption of previous freight cars. To be close to modern society.
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