Charge depleting tests for PEV and OVC HEV

Charge depleting tests for PEV and OVC HEV

This led to the situation that vehicle 58 with a peak power of 120 kW, but a 30 minutes power of only 60 kW, and a kerb mass of 1860 kg was classified as class 2 vehicle, although its maximum speed was 145 km/h. This vehicle could have easily driven the class 3 cycle, but was only tested on the class 2 cycle in the version 1.4, that did not contain an extra high speed part. With the 3 phases low, medium and high of the class 2 version 1.4 cycle the vehicle could drive more than 250 km or more than 17 cycles before the batteries were discharged.

Two CD tests on this cycle were performed with vehicle 58. The cumulative discharge curves are shown in Figure 15 and Figure 16. At the first glance there seems to be a wide spread of the energy consumption per cycle within a charge depleting test. For both tests the difference between maximum and minimum discharge energy over one cycle is 0,6 Ah which corresponds to 14% of the average (-6% to +8%) which is reasonably good.

However the break off point (end of charge depleting test) is significantly different in both tests (see Figure 17, Figure 18 and Figure 19), which results in a difference in the driven distance of about 9 km (253,5 km to 263,2 km/h) or +/- 3,5% in relation to the average range.

Figure 15: Cumulative discharge energy for CD test 1 for vehicle 58 on the class 2, version 1.4 cycle