Simple Prediction for Fuel Consumption and Cruising Distance of Internal Combustion Engine Vehicles with RFD Method 2019-01-0893
For the development of various parts and components of vehicles, it is inevitable to realize the effects of those structure and thermal performance on fuel consumption. However, owing to limited information for parts suppliers to obtain, it is not always easy to predict and study the fuel consumption under various driving conditions. In this report, the authors have developed an RFD (Regression Fuel-consumption Diagram) method to predict cruising performance of internal combustion engine vehicle only based on the published information to give to suppliers. The RFD method can calculate the fuel consumption based on the fuel consumption diagram which represents an engine characteristics and the control characteristics of transmission after the calculation of the driving power following a driving cycle. However, in general, the information for the fuel consumption diagram and the control characteristics of transmission are not open to the suppliers. In the RFD method, the unknown characteristics are identified from the published fuel consumption data by using standard reference models for the transmission and the fuel consumption diagram which were defined by regression of the characteristics of a representative vehicle. As an example application of the RFD method, the effects of driving cycle and air conditioning on the fuel consumption of internal combustion engine vehicle are studied. In addition, for the validation of the defined standard reference models, the influence of changing the standard reference model on the simulation results of fuel consumption is investigated. As a results, it is found that the difference of the simulation results in fuel consumption was less than 1% even if the standard reference models are changed, which shows the present method is a robust model. Therefore, the accuracy of simulation results by RFD method is sufficient to enable suppliers to predict roughly the cruising performance of internal combustion engine vehicle.