车用功率分流式液压混合动力系统特性研究

基于液压机械传动,提出了一种分速汇矩式液压混合动力传动系统。通过对系统的布置结构、主要组成元件描述及工作机理分析,研究典型工况功率流特性,提出了可行的再生制动方案。分析了再生制动和辅助驱动工况的工作特性。并结合计算机仿真,基于一定城市运行工况分析了系统的再生制动效能和辅助驱动性能。结果表明,液压混合动力技术改善了配备液压机械传动车辆的燃油经济性,具有重要的工程应用意义。

燃用不同标号汽油对车辆排放与油耗影响研究

随着领先国家的地方油品标准的出台,车辆燃用不同标号的汽油成为可能。用六台不同型号的整车分别燃用不同标号的汽油,研究其排放性能与燃油经济性的影响。试验结果表明:适当降低汽油辛烷值,对燃油经济性的影响效果不明显,最高增幅在2%和4%以内,油耗成本不增加;适当降低辛烷值导致着火延后期短,HC、CO和NO_x整体排放较为明显的降低,最小降幅分别是4.5%,3.5%和4.5%。

自主共轨系统整车降油耗试验研究

通过对某车平面路等速行驶各档负荷曲线与发动机MAP图的匹配分析,提出了基于轨压、提前角等参数的优化标定方法,使该系统在满足排放法规和发动机设计指标的前提下,实现了良好的扭矩特性和经济性。通过对比试验表明:整车油耗降低了近8%,优化了原机的经济性,并为其他机型的降油耗提供了有益借鉴。

新一代MG5 动力不可廉

让我看看现在还有谁仍在深耕售价十万元以内的燃油经济型家用车市场——原来这次是名爵,新一代MG5让年轻人的人生第一台车变得更有炫耀资本了。我们这代人——也就是已经被人叫做“大叔”的老男孩——的汽车生涯,大多是从经济型家用车开始的。那时,碰到一台开起来能有不错乐趣的小车,就能让我们这群爱车的傻小子开心好久。

Model predictive control for adaptive cruise control with multi-objectives: comfort,fuel-economy,safety and car-following

For automated vehicles,comfortable driving will improve passengers’ satisfaction.Reducing fuel consumption brings economic profits for car owners,decreases the impact on the environment and increases energy sustainability.In addition to comfort and fuel-economy,automated vehicles also have the basic requirements of safety and car-following.For this purpose,an adaptive cruise control (ACC) algorithm with multi-objectives is proposed based on a model predictive control (MPC) framework.In the proposed ACC algorithm,safety is guaranteed by constraining the inter-distance within a safe range; the requirements of comfort and car-following are considered to be the performance criteria and some optimal reference trajectories are introduced to increase fuel-economy.The performances of the proposed ACC algorithm are simulated and analyzed in five representative traffic scenarios and multiple experiments.The results show that not only are safety and car-following objectives satisfied,but also driving comfort and fuel-economy are improved significantly.