为提升商用车的行驶安全性,本文基于触摸屏式新型人机交互系统,对商用车电控空气悬架(electronically controlled air suspension,ECAS)系统的故障诊断系统进行研究。针对ECAS故障诊断系统总体架构,提出了ECAS故障诊断及故障保护机制,...为提升商用车的行驶安全性,本文基于触摸屏式新型人机交互系统,对商用车电控空气悬架(electronically controlled air suspension,ECAS)系统的故障诊断系统进行研究。针对ECAS故障诊断系统总体架构,提出了ECAS故障诊断及故障保护机制,阐述了典型ECAS故障实例的诊断策略,并采用Matlab/Simulink搭建了诊断策略模型和故障码生成模型。为验证本文所提出的故障诊断及故障保护机制的可行性与实用性,以ECAS系统中压力传感器为例,对模型进行仿真分析和硬件在环试验。试验结果表明,在典型压力传感器故障工况下,本文所提出的ECAS故障诊断及故障保护机制,能够准确检测出相应故障,正确输出一系列相关信号,并在人机交互系统上将诊断结果进行实时显示。该研究对商用车ECAS人机交互系统的故障诊断系统设计开发具有一定的参考价值。展开更多
DC DC convertors can convert the EV's high voltage DC power supply into the low voltage DC power supply. In order to design an excellent convertor one must be guided by theory of automatic control. The principl...DC DC convertors can convert the EV's high voltage DC power supply into the low voltage DC power supply. In order to design an excellent convertor one must be guided by theory of automatic control. The principle and the method of design, modeling and control for DC DC convertors of EV are introduced. The method of the system response to a unit step function input and the frequency response method are applied to researching the convertor's mathematics model and control characteristic. Experiments show that the designed DC DC convertor's output voltage precision is high, the antijamming ability is strong and the adjustable performance is fast and smooth.展开更多
A control allocation algorithm based on pseudo-inverse method was proposed for the over-actuated system of four in-wheel motors independently driving and four-wheel steering-by-wire electric vehicles in order to impro...A control allocation algorithm based on pseudo-inverse method was proposed for the over-actuated system of four in-wheel motors independently driving and four-wheel steering-by-wire electric vehicles in order to improve the vehicle stability. The control algorithm was developed using a two-degree-of-freedom(DOF) vehicle model. A pseudo control vector was calculated by a sliding mode controller to minimize the difference between the desired and actual vehicle motions. A pseudo-inverse controller then allocated the control inputs which included driving torques and steering angles of the four wheels according to the pseudo control vector. If one or more actuators were saturated or in a failure state, the control inputs are re-allocated by the algorithm. The algorithm was evaluated in Matlab/Simulink by using an 8-DOF nonlinear vehicle model. Simulations of sinusoidal input maneuver and double lane change maneuver were executed and the results were compared with those for a sliding mode control. The simulation results show that the vehicle controlled by the control allocation algorithm has better stability and trajectory-tracking performance than the vehicle controlled by the sliding mode control. The vehicle controlled by the control allocation algorithm still has good handling and stability when one or more actuators are saturated or in a failure situation.展开更多
文摘为提升商用车的行驶安全性,本文基于触摸屏式新型人机交互系统,对商用车电控空气悬架(electronically controlled air suspension,ECAS)系统的故障诊断系统进行研究。针对ECAS故障诊断系统总体架构,提出了ECAS故障诊断及故障保护机制,阐述了典型ECAS故障实例的诊断策略,并采用Matlab/Simulink搭建了诊断策略模型和故障码生成模型。为验证本文所提出的故障诊断及故障保护机制的可行性与实用性,以ECAS系统中压力传感器为例,对模型进行仿真分析和硬件在环试验。试验结果表明,在典型压力传感器故障工况下,本文所提出的ECAS故障诊断及故障保护机制,能够准确检测出相应故障,正确输出一系列相关信号,并在人机交互系统上将诊断结果进行实时显示。该研究对商用车ECAS人机交互系统的故障诊断系统设计开发具有一定的参考价值。
文摘DC DC convertors can convert the EV's high voltage DC power supply into the low voltage DC power supply. In order to design an excellent convertor one must be guided by theory of automatic control. The principle and the method of design, modeling and control for DC DC convertors of EV are introduced. The method of the system response to a unit step function input and the frequency response method are applied to researching the convertor's mathematics model and control characteristic. Experiments show that the designed DC DC convertor's output voltage precision is high, the antijamming ability is strong and the adjustable performance is fast and smooth.
基金Project(51175015)supported by the National Natural Science Foundation of ChinaProject(2012AA110904)supported by the National High Technology Research and Development Program of China
文摘A control allocation algorithm based on pseudo-inverse method was proposed for the over-actuated system of four in-wheel motors independently driving and four-wheel steering-by-wire electric vehicles in order to improve the vehicle stability. The control algorithm was developed using a two-degree-of-freedom(DOF) vehicle model. A pseudo control vector was calculated by a sliding mode controller to minimize the difference between the desired and actual vehicle motions. A pseudo-inverse controller then allocated the control inputs which included driving torques and steering angles of the four wheels according to the pseudo control vector. If one or more actuators were saturated or in a failure state, the control inputs are re-allocated by the algorithm. The algorithm was evaluated in Matlab/Simulink by using an 8-DOF nonlinear vehicle model. Simulations of sinusoidal input maneuver and double lane change maneuver were executed and the results were compared with those for a sliding mode control. The simulation results show that the vehicle controlled by the control allocation algorithm has better stability and trajectory-tracking performance than the vehicle controlled by the sliding mode control. The vehicle controlled by the control allocation algorithm still has good handling and stability when one or more actuators are saturated or in a failure situation.
