能量循环利用是汽车电子产业发展的主要研究方向之一,基于车辆发动机工作原理为辅助设备(如制冷系统和液压泵)提供动力,从而降低车辆燃料消耗,达到节能的效果。车辆再生辅助动力系统(Regenerative auxiliary power System,RAPS)以货车...能量循环利用是汽车电子产业发展的主要研究方向之一,基于车辆发动机工作原理为辅助设备(如制冷系统和液压泵)提供动力,从而降低车辆燃料消耗,达到节能的效果。车辆再生辅助动力系统(Regenerative auxiliary power System,RAPS)以货车为研究对象,通过增加一个额外电池,将车辆变为混合动力车。为了追求较高的总体效率,设计了一种整体控制器,用于确定如何以及何时为电池充电,同时将辅助系统的功耗降至最低。研究结果表明,与传统服务车辆的燃油消耗相比,提出的RAPS可节省约7%的燃油。展开更多
According to the road adaptive requirements for the vehicle longitudinal safety assistant system an estimation method of the road longitudinal friction coefficient is proposed.The method can simultaneously be applied ...According to the road adaptive requirements for the vehicle longitudinal safety assistant system an estimation method of the road longitudinal friction coefficient is proposed.The method can simultaneously be applied to both the high and the low slip ratio conditions. Based on the simplified magic formula tire model the road longitudinal friction coefficient is preliminarily estimated by the recursive least squares method.The estimated friction coefficient and the tires model parameters are considered as extended states. The extended Kalman filter algorithm is employed to filter out the noise and adaptively adjust the tire model parameters. Then the final road longitudinal friction coefficient is accurately and robustly estimated. The Carsim simulation results show that the proposed method is better than the conventional algorithm. The road longitudinal friction coefficient can be quickly and accurately estimated under both the high and the low slip ratio conditions.The error is less than 0.1 and the response time is less than 2 s which meets the requirements of the vehicle longitudinal safety assistant system.展开更多
文摘力反馈式踏板(FF)是自适应巡游控制(ACC)汽车辅助驾驶系统的一种有益扩展, 使用它可以大大提高汽车驾驶的舒适性和安全性.文章阐述了一种力反馈式踏板(FFP) 及其在自适应巡游控制(ACC) 汽车辅助驾驶系统中的应用,并给出其硬件在环(Hardware in the Loop) 检测自动化, 取得了很好的实验效果.
文摘能量循环利用是汽车电子产业发展的主要研究方向之一,基于车辆发动机工作原理为辅助设备(如制冷系统和液压泵)提供动力,从而降低车辆燃料消耗,达到节能的效果。车辆再生辅助动力系统(Regenerative auxiliary power System,RAPS)以货车为研究对象,通过增加一个额外电池,将车辆变为混合动力车。为了追求较高的总体效率,设计了一种整体控制器,用于确定如何以及何时为电池充电,同时将辅助系统的功耗降至最低。研究结果表明,与传统服务车辆的燃油消耗相比,提出的RAPS可节省约7%的燃油。
基金The National Natural Science Foundation of China(No.61273236)the Natural Science Foundation of Jiangsu Province(No.BK2010239)the Ph.D. Programs Foundation of Ministry of Education of China(No.200802861061)
文摘According to the road adaptive requirements for the vehicle longitudinal safety assistant system an estimation method of the road longitudinal friction coefficient is proposed.The method can simultaneously be applied to both the high and the low slip ratio conditions. Based on the simplified magic formula tire model the road longitudinal friction coefficient is preliminarily estimated by the recursive least squares method.The estimated friction coefficient and the tires model parameters are considered as extended states. The extended Kalman filter algorithm is employed to filter out the noise and adaptively adjust the tire model parameters. Then the final road longitudinal friction coefficient is accurately and robustly estimated. The Carsim simulation results show that the proposed method is better than the conventional algorithm. The road longitudinal friction coefficient can be quickly and accurately estimated under both the high and the low slip ratio conditions.The error is less than 0.1 and the response time is less than 2 s which meets the requirements of the vehicle longitudinal safety assistant system.