79 Vehicle Architectures and Design 20 18 16 14 Cycle Speed (m/s) 12 10 8 6 4 2 0 100 200 300 400 500 600 700 0 Time (s) FIGURE 3.23 Japan1015 Japanese standard drive cycle. Speed t cr t b t a t co Time in s t i FIGURE 3.24 SAE J227a standard driving cycle. idle time t i prior to the completion of the period. The driving cycle for J227a is shown in Figure 3.24 with the recommended times for each of the schedules given in Table 3.5. The figure drawn is slightly modified from the pattern recommended by the SAE. The J227a procedures specify only the cruise velocity and the time of transition from one mode to the other.
The velocity profile at segments other than the cruising part is not fixed, and hence, the distance traversed during these other periods is also variable. In reality, the distances would depend on the acceleration capability of the vehicle under consideration. For simplicity, straight-line approximations have been assumed for these schedules in this book.