Test Technologies Contributing to Electrification - 2. Driving Simulator Test Technologies for Establishing Unique Performances of Electric VehiclesFig. 11 Performance design processFig. 12 Sensitivity analysis using the driving simulatorFig. 13 Subjective evaluation of driving simulator(a) Feeling of comfort (b) Feeling of accelerationusing a human body simulation. The control logic and vehicle parameters for achieving the performance targets were examined using a vehicle simulation based on the incorporated target quantitative values. The validation prior to an actual vehicle test was conducted on a driving simulator using the final vehicle specifications and control logic, followed by a final checking process in an actual vehicle test.The prediction of performance, which The details of how a DS is utilized are described in this paper. Fig. 12 presents the steady-state front/rear acceleration magnitudes and front/rear jerk magnitudes, which are derivatives of the front/rear accelerations, for the front/rear motion obtained from the vehicle motion simulation. It also depicts the pitch angle and its derivative, the pitch rate, simulated as arbitrary values and input to the driving simulator to analyze the sensitivity to each influencing factor in the DS.The results of the sensitivity analysis are presented in Fig. 13. With the upper direction of the graph indicating a better subjective score, which is differently colored for each score. The scores for feelings of comfort and acceleration are illustrated in Figs. 13a and 13b, respectively. The lower the pitch rate and front/rear jerk, the higher the passenger comfort level, as indicated in Fig. 13a. By contrast, the greater the front/rear jerk, the higher the score for acceleration; lower scores are observed when the pitch rate is too high. Consequently, both the feeling of acceleration and comfort can be increased by lowering the pitch rate, and a high subjective evaluation can be obtained the acceleration/deceleration motion by setting the front/rear jerk to a value appropriate for the driver's situation. includes subjective human evaluation, is made possible by following the above procedure, which enables efficient development in actual vehicles.Based on the results of the above tests on the driving simulator and the simulation results of the passenger behavior prediction model, performance targets for the front/rear jerk and pitch rate are established to improve passenger comfort.The effectiveness is verified on an actual prototype vehicle using the aforementioned target settings. Figs. 14a and 14b reveal the results for cases without reducing the load on passengers and with control to reduce the load on passengers when the vehicle accelerates at the same rate from a standstill to a specific vehicle speed, respectively. The front and rear jerks and pitch rates are presented on the second axis. The difference between the acceleration on the human head and that on the vehicle decreases by lowering the front/rear jerk and pitch rate. This implies that the shaking of the passengerʼs head could be reduced. Similarly, the passengerʼs feeling of in 43
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