Presentation on theme: "WLTP-EU DB short trip analyis 1 by H. Steven 30.09.2014 Overview of the WLTP-EU database short trip analysis."— Presentation transcript:
WLTP-EU DB short trip analyis 1 by H. Steven 30.09.2014 Overview of the WLTP-EU database short trip analysis
Categorisation of the Database 2 The WLTP in-use database contains second by second data from Europe, India, Japan, Korea and US. For the analysis the WLTP in-use data was divided into short trips and stop phases. Stop phases are time periods with vehicle speeds = 1 km/h between two consecutive stops. A further segmentation of the data was done with respect to the max. speed of a short trip: Low phase: v_max <= 60 km/h, Medium phase: 60 km/h < v_max <= 80 km/h, High phase: 80 km/h < v_max <= 110 km/h, Extra high phase: v_max > 110 km/h.
Categorisation of the Database 3 This schema was chosen in order to ease the comparability of in-use data from different regions of the world (India, Japan, Korea, US) This presentation focusses on the European part of the database. The EU part of the WLTP in-use database contains data from the following member states: Belgium, France, Germany, Italy, Poland, France, Slovenia, Spain, Sweden, UK. Within the short trips the following driving condition phases were differentiated:
Categorisation of the Database 4 Acceleration (acc): a > 0,278 m/s², Cruise : -0,278 m/s² <= a <= 0,278 m/s², Deceleration (dec): a < -0,278 m/s² Table 1 shows an overview of the results:
Short trip duration distribution 5 The following figures show the duration and distance distributions of the short trips for the four speed classes, number and distance or time weighted. The major part of the short trips in the low speed class is shorter than 2 min. And even for the extra high speed part 50% of the short trips are below 13 min. The distance weighting changes this situation to longer durations: The short trips below 13 min in extra high represent less than 20% of the total mileage.
Driving condition distributions 10 Table 2 shows the duration distributions of the acceleration phases for the short trips of the four speed classes. All phases have durations below 1 min. Figure 5 shows the duration distributions of the cruise phases for the short trips of the four speed classes. These phases are significantly longer than the others. Table 3 shows the duration distributions of the deceleration phases for the short trips of the four speed classes. The durations of the deceleration phases tend to be a bit longer than the acceleration phases, but the differences are very low.