To address the comfort of an electric vehicle, a coupling mechanism between mechanical friction braking and electric regenerative braking was studied. A cooperative braking system model was established, and comprehensive simulations and system optimizations were carried out. The performance of the cooperative braking system was analyzed. The distribution of the braking force was optimized by an intelligent method, and the distribution of a braking force logic diagram based on comfort was proposed. Using an intelligent algorithm, the braking force was distributed between the two braking systems and between the driving and driven axles. The experiment based on comfort was carried out. The results show that comfort after optimization is improved by 76.29% compared with that before optimization by comparing RMS value in the time domain. The reason is that the braking force distribution strategy based on the optimization takes into account the driver’s braking demand, the maximum braking torque of the motor, and the requirements of vehicle comfort, and makes full use of the braking torque of the motor. The error between simulation results and experimental results is 5.13%, which indicates that the braking force’s distribution strategy is feasible.
The double barrel (DB) is the essential functional part of continuous asphalt mixing equipment, which affects the mixing uniformity of asphalt mixture. To improve the mixing uniformity of the mixture, a double barrel with differential velocity (DBDV) was proposed. The structure of DBDV and its influence on the mixing uniformity of the mixture were described. The current double barrel is divided into single horizontal shaft DB and double horizontal shaft DBDV. The discrete element simulation is used to compare the mixing uniformity of two kinds of DB. The results show that the mixing uniformity of double horizontal shaft DBDV is better than that of the single horizontal shaft DB, proving the correctness and rationality of the above analysis.
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