时变交通下生鲜配送电动车辆路径优化方法

依据时变交通路网特点设计基于路段划分策略的行驶时间计算方法，综合考虑客户对生鲜产品最低新鲜度约束，车载限制和电动车电量约束，设计三约束决策因子方法.以配送总成本最小为目标，构建时变交通下电动车城市生鲜配送路径优化模型，根据模型特点设计自适应改进的蚁群算法.实验结果表明，本文方法能够根据客户生鲜新鲜度要求，客户属性和路网特性，合理安排发车时间，科学规划配送路径，有效避免交通拥堵；通过算法对比，本文模型和算法能够明显降低配送成本，提高企业经济效益.

Electric Vehicle Route Optimization for Fresh Logistics Distribution Based on Time-varying Traffic Congestion

The electric vehicle routing planning for fresh logistics distributions based on time- varying traffic conditions is investigated in this paper. With the time- varying traffic network, the calculation method for travel time is designed based on a route section division strategy. A three-constraint decision factor method is designed to consider the minimum product freshness limit, vehicle load constraints, and electric vehicle power constraints. A distribution route optimization model for electric vehicles is established for the urban logistics distribution of fresh products to minimize the total distribution cost. An improved ant colony algorithm is proposed, in which its parameters are adjusted adaptively. Simulation results show that this method can properly arrange the departure time and plan the distribution route to avoid traffic congestion, according to the requirements of product freshness, customer attributes, and road network characteristics. Compared with other algorithms, the proposed model and algorithm can significantly reduce the distribution cost and improve the economic benefits of enterprises.