Lookup table is widely used in automotive industry for the design of engine control units(ECU).Together with a proportional-integral controller,a feed-forward and feedback control scheme is often adopted for automotiv...Lookup table is widely used in automotive industry for the design of engine control units(ECU).Together with a proportional-integral controller,a feed-forward and feedback control scheme is often adopted for automotive engine management system(EMS).Usually,an ECU has a structure of multi-input and single-output(MISO).Therefore,if there are multiple objectives proposed in EMS,there would be corresponding numbers of ECUs that need to be designed.In this situation,huge efforts and time were spent on calibration.In this work,a multi-input and multi-out(MIMO) approach based on model predictive control(MPC) was presented for the automatic cruise system of automotive engine.The results show that the tracking of engine speed command and the regulation of air/fuel ratio(AFR) can be achieved simultaneously under the new scheme.The mean absolute error(MAE) for engine speed control is 0.037,and the MAE for air fuel ratio is 0.069.展开更多
基于台架采集数据,采用外部输入非线性自回归(nonlinear autoregressive model with exogenous input,NARX)神经网络建立了具备瞬态特性的柴油机排气温度计算模型作为虚拟传感器,并采用并发式训练方法对模型进行训练。将结果与前馈神经...基于台架采集数据,采用外部输入非线性自回归(nonlinear autoregressive model with exogenous input,NARX)神经网络建立了具备瞬态特性的柴油机排气温度计算模型作为虚拟传感器,并采用并发式训练方法对模型进行训练。将结果与前馈神经网络、长短期记忆网络(long short term memory,LSTM)神经网络及量产发动机的排温传感器采集结果进行对比。经验证,稳态工况下,两种神经网络均能达到较高精度;欧洲瞬态循环(European transient cycle,ETC)工况下,NARX神经网络计算温度的最大偏差为6.6℃,量产发动机排温传感器测得温度最大偏差为45.9℃。NARX神经网络所需的计算时间约为现有电控单元排温模型的2.5倍。展开更多
水泥生产立磨出风口温度是判断立磨运行状态是否安全稳定的关键参数,对该参数提前预测可以减少立磨振动,提高运行稳定性,增加产量,降低能耗及相关碳排放。水泥立磨系统具有多参数、大时滞和非线性等复杂特性。针对上述问题,提出了基于...水泥生产立磨出风口温度是判断立磨运行状态是否安全稳定的关键参数,对该参数提前预测可以减少立磨振动,提高运行稳定性,增加产量,降低能耗及相关碳排放。水泥立磨系统具有多参数、大时滞和非线性等复杂特性。针对上述问题,提出了基于互相关延时分析优化的非线性自回归外部输入(Nonlinear AutoRegressive with eXogenous inputs,NARX)神经网络,并用于立磨出风口温度预测。首先,采用皮尔逊相关性分析从多个参数中确定影响立磨出风口温度的关键参数。同时,利用互相关延时分析进行时滞分析,解决大时滞问题。其次,通过优化的NARX神经网络,实现非线性工况下温度的精准预测。案例验证结果表明,所提出模型的拟合度达到了0.99967,均方误差为0.56483,预测精度达到了98.4%以上。预测模型结果可指导立磨操作人员及时控制立磨振动,提高水泥产量并降低能耗和碳排放。展开更多
Automotive engine control has been continuously improved due to the strong demands from the society and the market since introducing electronic controls but not always following control theories. Therefore, it is not ...Automotive engine control has been continuously improved due to the strong demands from the society and the market since introducing electronic controls but not always following control theories. Therefore, it is not easy for researchers from academia and even engineers from the automotive industry to grasp the whole aspect of engine control. To encounter the issue, important features of engine control are extracted and generalized from the standpoint of control engineering. Comparisons of the control and model predictive control （MPC） showed an outstanding performance of the control generalized from engine controls and how to apply MPC in the framework.展开更多
基金Project supported by the Centre for Smart Grid and Information Convergence(CeSGIC)at Xi’an Jiaotong-Liverpool University,China
文摘Lookup table is widely used in automotive industry for the design of engine control units(ECU).Together with a proportional-integral controller,a feed-forward and feedback control scheme is often adopted for automotive engine management system(EMS).Usually,an ECU has a structure of multi-input and single-output(MISO).Therefore,if there are multiple objectives proposed in EMS,there would be corresponding numbers of ECUs that need to be designed.In this situation,huge efforts and time were spent on calibration.In this work,a multi-input and multi-out(MIMO) approach based on model predictive control(MPC) was presented for the automatic cruise system of automotive engine.The results show that the tracking of engine speed command and the regulation of air/fuel ratio(AFR) can be achieved simultaneously under the new scheme.The mean absolute error(MAE) for engine speed control is 0.037,and the MAE for air fuel ratio is 0.069.
文摘基于台架采集数据,采用外部输入非线性自回归(nonlinear autoregressive model with exogenous input,NARX)神经网络建立了具备瞬态特性的柴油机排气温度计算模型作为虚拟传感器,并采用并发式训练方法对模型进行训练。将结果与前馈神经网络、长短期记忆网络(long short term memory,LSTM)神经网络及量产发动机的排温传感器采集结果进行对比。经验证,稳态工况下,两种神经网络均能达到较高精度;欧洲瞬态循环(European transient cycle,ETC)工况下,NARX神经网络计算温度的最大偏差为6.6℃,量产发动机排温传感器测得温度最大偏差为45.9℃。NARX神经网络所需的计算时间约为现有电控单元排温模型的2.5倍。
文摘水泥生产立磨出风口温度是判断立磨运行状态是否安全稳定的关键参数,对该参数提前预测可以减少立磨振动,提高运行稳定性,增加产量,降低能耗及相关碳排放。水泥立磨系统具有多参数、大时滞和非线性等复杂特性。针对上述问题,提出了基于互相关延时分析优化的非线性自回归外部输入(Nonlinear AutoRegressive with eXogenous inputs,NARX)神经网络,并用于立磨出风口温度预测。首先,采用皮尔逊相关性分析从多个参数中确定影响立磨出风口温度的关键参数。同时,利用互相关延时分析进行时滞分析,解决大时滞问题。其次,通过优化的NARX神经网络,实现非线性工况下温度的精准预测。案例验证结果表明,所提出模型的拟合度达到了0.99967,均方误差为0.56483,预测精度达到了98.4%以上。预测模型结果可指导立磨操作人员及时控制立磨振动,提高水泥产量并降低能耗和碳排放。
文摘Automotive engine control has been continuously improved due to the strong demands from the society and the market since introducing electronic controls but not always following control theories. Therefore, it is not easy for researchers from academia and even engineers from the automotive industry to grasp the whole aspect of engine control. To encounter the issue, important features of engine control are extracted and generalized from the standpoint of control engineering. Comparisons of the control and model predictive control （MPC） showed an outstanding performance of the control generalized from engine controls and how to apply MPC in the framework.
