基于比功率法的信号控制交叉口排队车辆尾气排放估计

Estimation of Queued Vehicle Emissions at Signalized Intersections Based on Vehicle Specific Power Approach

为了优化信号控制参数以降低机动车在交叉口上的尾气排放,分别根据排队车辆的减速工况、怠速工况、加速工况,按照比功率法建立了一种新颖的反推估计方法,定量估计信号控制交叉口前排队车辆的尾气排放总量,并建立了信号控制参数优化的尾气排放评价依据,最后应用建立的模型对某个单点定时信号控制交叉口前排队车辆的尾气排放进行了估计。研究结果表明:该方法能依据比功率计算公式反推出加速过程和减速过程经历的所有比功率区间对应的时间长度;可根据车辆的到达和离去特征、信号配时参数计算每周期的总停车次数和平均停车延误,以此作为受信号控制影响的停车车辆总数及怠速工况对应的时间长度;应用该方法估计尾气排放是可行的。

In order to reduce vehicle emissions at signalized intersections by optimizing signal control parameters. A novel queued vehicle emission estimation method named reverse derivation estimation method was proposed based on vehicle specific power （VSP） approach, according to the decelerating condition, idling condition, and accelerating condition of queued vehicles respectively, vehicle emission evaluation basis was also established by optimizing signal control parameters. The proposed model was used to estimate queued vehicle emissions at an isolated example intersection controlled by a fixed-time signal. The results show that the method can inversely derive the durations corresponding to all VSP intervals during the accelerating and decelerating conditions based on VSP calculation formula. The total number of stops and average stop delay of all queued vehicles in a cycle is calculated according to the vehicle arrival and departure characteristics and signal timing parameters, which is taken as the total number of stops affected by signal control and the average idling duration of all queued vehicles under the idling condition respectively. The proposed method is feasible to estimate vehicle emissions.