共查询到20条相似文献,搜索用时 125 毫秒
1.
2.
3.
4.
基于RBF优化控制氢燃料发动机点火提前角 总被引:1,自引:0,他引:1
基于RBF神经网络构建氢(H2)燃料发动机最佳点火提前角优化模型,对点火提前角进行优化控制,改善H2燃料发动机动力性、经济性以及排放性能。试验结果表明,该模型能预测H2燃料发动机最佳点火提前角,并可以大大减轻标定试验工作量。 相似文献
5.
电控柴油机的标定需要综合考虑油耗、排放、进排气温度等因素,但随着国五排放法规的实施,导致标定难度成指数级增加,传统的标定手段工作量大,成本高。文中在模型标定的基础上提出了基于重要工况点的逐点模型标定方法。通过聚类分析并结合实际排放特性分析,选出NEDC循环工况中重要工况点;采用空间填充法完成对各工况点的试验设计,并通过台架试验采集发动机试验数据;在完成各响应模型搭建的基础上,通过遗传算法得到各工况点下的最优燃烧参数组合;根据三次多项式拟合完成MAP绘制;基于万有特性试验对MAP进行优化,同时进行整车转鼓排放试验。研究结果表明,该标定模型生成的MAP具有良好的燃油经济性和较好的排放性能,可以准确地预测发动机响应参数,相较于人工标定油耗降低了15%。 相似文献
6.
7.
电控发动机性能开发是一项系统工程,包括性能设计、结构设计、标定数据优化以及整机性能优化。通过分析电控系统的标定方法、试验设计方法,认为标定方法不仅要做到优化电控系统与发动机的匹配,还应具备预测缺陷、性能和改进方向的功能。 相似文献
8.
9.
10.
针对车用汽油机标定成本高、开发周期长等问题,提出一种车用汽油机的标定优化方法,以提高标定效率。建立发动机稳态工况的高斯过程回归模型,通过少量的试验数据预测燃油消耗率(BSFC)、氮氧化合物(NOx)等发动机性能和排放参数,并引入决定系数(R2)评估模型质量。在非支配排序中加入了约束违反并引入混合交叉算子对NSGA-Ⅱ进行改进。将预测模型作为改进NSGA-Ⅱ的目标函数,进行发动机标定优化。采用一种平滑校准图自动生成的方法,根据校准图性能和平滑度,以自动方式选择最终校准图。结果表明:对于标准测试函数,改进NSGA-Ⅱ算法的分布性最高提升21.41%,应用于发动机标定优化,为决策者提供了更多的优选方案。将改进的NSGA-Ⅱ算法与平滑校准图自动生成方法结合,在WLTC循环工况下,标定结果相较于人工标定校准图,燃油消耗率降低了1%,NOx排放降低了5%,为减少发动机标定工作量提供了参考。 相似文献
11.
12.
This paper presents an accurate engine fuel injection quantity control technique for high pressure common rail (HPCR) injection
systems by an iterative learning control (ILC)-based, on-line calibration method. Accurate fuel injection quantity control
is of importance in improving engine combustion efficiency and reducing engine-out emissions. Current Diesel engine fuel injection
quantity control algorithms are either based on pre-calibrated tables or injector models, which may not adequately handle
the effects of disturbances from fuel pressure oscillation in HPCR, rail pressure sensor reading inaccuracy, and the injector
aging on injection quantity control. In this paper, by using an exhaust oxygen fraction dynamic model, an on-line parameter
calibration method for accurate fuel injection quantity control was developed based on an enhanced iterative learning control
(EILC) technique in conjunction with HPCR injection system. A high-fidelity, GT-Power engine model, with parametric uncertainties
and measurement disturbances, was utilized to validate such a methodology. Through simulations at different engine operating
conditions, the effectiveness of the proposed method in rejecting the effects of uncertainties and disturbance on fuel injection
quantity control was demonstrated. 相似文献
13.
Jae Woo Chung Nam Ho Kim Deok Jin Kim Seong Sik Jang 《International Journal of Automotive Technology》2018,19(2):209-220
Recently, to improve vehicle fuel economy, as well as the performance of internal combustion engines, optimized system matching between a vehicle’s drivetrain and engine has become a very important technical issue. For this reason, the need for simulation research on engine and vehicle performance improvement has increased. But in general, since both engine simulation and vehicle simulation require initial engine calibration map input, a simple engine calibration method is required for the efficient configuration of various virtual engine calibration map setups. On this background, in this study, an example of waste gate turbocharger (WGT) cooled — exhaust gas recirculation (EGR) Diesel engine calibration using a test-based mean value engine model is presented as a suitable engine calibration map setting method. Also, the feasibility of an engine calibration model is confirmed through various engine tests. Using the simple model presented here, it is possible for diverse engine operating conditions and engine performance maps to be acquired. 相似文献
14.
Nowadays, the selective catalytic reduction (SCR) is a promising solution to fulfill stringent nitrogen oxide (NOX) emission standards enforced by worldwide regulation bodies for lean burning engines. However, in the practical operation, urea deposits occur under unfavorable conditions, which bring about a failure of urea dosing strategy, affect the SCR system de-NOx performance and lowering the fuel economy by increasing the engine back pressure. This paper will present 3D deposit model, which can be used to predict the deposit position. Furthermore, a model-based controls strategy and calibration are designed. The comparison test results of both engine emission tests and vehicle field tests shows there is significant deposits improvement with the embedded model. 相似文献
15.
16.
17.
Heeyun Lee Juyean Sung Hyeokjun Lee Chunhua Zheng Wonsik Lim Suk Won Cha 《International Journal of Automotive Technology》2018,19(4):687-694
In this study, a model-based integrated control method for engines and continuous variable transmissions (CVTs) is developed. CVT refers to a type of transmission which allows an engine to be operated independently with respect to the vehicle speed, with the engine torque and CVT gear ratio controlled in an integrated manner. In the proposed integrated control scheme, engine operating points which minimize the rate of instantaneous fuel consumption are calculated, and the engine target torque and target gear ratio are determined in an integrated manner based on the results of the calculations. Unlike the previous map-based control method, the method introduced in this study does not require an engine torque map or a CVT ratio map for tuning, and the engine torque and CVT ratio are controlled to minimize the amount of fuel used while satisfying the level of acceleration demand from the driver. The control scheme is based on the powertrain model, and the CVT response lag and transmission loss are also considered in the integrated control processes. The algorithm is simulated with various driving cycles, with the simulation results showing that the fuel economy performance of the vehicle system is improved with the newly suggested engine-CVT integrated control algorithm. 相似文献
18.
柴油机电控喷油系统标定 总被引:2,自引:0,他引:2
本文介绍了基于计算机控制的柴油机电控系统标定系统,通过优化过程获得最优标定结果的优化标定方法和基于模型在线优化标定策略,使用该标定系统标定柴油机电喷油系统,匹配6110柴油机和MD-TICS喷油泵,在满足排放法规的前提下,获得了最佳经济性。 相似文献
19.
20.
本文对工况分析法试验进行了定义,论述了该试验在匹配标定过程中的作用,介绍了该试验中的工况统计分析法和过程分析法在十五工况排放试验,底盘测功机的十五工况油耗和等速油耗试验,试验场整车道路试验,城区道路试验中的应用。 相似文献