基于SIMULINK的汽车发动机怠速模糊神经网络控制

针对汽车发动机怠速控制要求,提出了一种按权值模糊化FCM模型形成的模糊径向基函数(RBF)神经网络控制方案,在SIMULINK环境下进行了控制仿真,获得了比模糊控制更好的性能。     

利用旁通空气的摩托车发动机怠速控制系统研究

怠速控制不当会使发动机燃油消耗增加，排放恶化、运行不稳定，作者设计了利用旁通空气的摩托车发动机怠速控制系统，通过步进电机控制旁通阀的开度以改变怠速时空燃比，在控制策略上采用了模糊控制技术，并进行了发动机台架试验，试验结果表明采用了本系统后发动机的怠速转速下降，怠速稳定性提高，怠速排放得到较大改善。     

汽油机怠速稳定性的模糊控制仿真研究

考虑到发动机怠速工作过程的非线性、时变性和不确定性，研究了模糊控制理论在发动机怠速控制中的应用。设计了一种汽油机怠速转速模糊控制系统，并利用MATLAB所提供的Simulink仿真工具确定了控制系统的参数。仿真结果表明：该模糊控制器具有良好的控制性能。     

模糊PID控制在发动机怠速控制中的仿真

考虑到发动机怠速工作过程的非线性、时变性和不确定性,研究了模糊控制理论在发动机怠速控制中的应用。设计了一种汽油机怠速转速模糊比例积分微分(PID)控制系统,并利用矩阵实验室(MATLAB)所提供的Simulink仿真工具进行了仿真。结果表明:该模糊PID控制具有良好的控制性能。     

汽车发动机怠速不良的诊断及处理

汽车发动机怠速不良的诊断及处理黑龙江交通高等专科学校张荣沂发动机怠速运转良好，是发动机运转正常的标志之一。由于汽车发动机在怠速运转时的转速低，化油器内空气流速也低。这样不仅减少了充气量，使废气残留量相对增多，而且造成燃料雾化质量差，可燃混合气混合不均...     

柴油机怠速转速稳定性的模糊控制

本文分析了直喷式柴油机喷油系统对怠速稳定性的不利影响，考虑到柴油机怠速过程的非线性、时变性和不确定性，提出了一个柴油机速控制模型。在该模型的怠速控制与原机械调速器以及模拟机构调整器的比例控制之间进行了怠速稳定的对比试验。     

模糊控制在发动机怠速控制中应用的研究

作者从提高发动机经济性角度出发，提出了应用模糊技术进步怠速控制，使发动机性能指标得到一定改善。提出系统的建立原则并给出系统的大体框架及组成。     

应用神经网络模糊控制器的发动机怠速控制

应用模糊控制理论设计了一个用于发动机怠速控制的模糊控制器,并用ＢＰ人工神经网络实现这种模糊控制器输入输出的映射关系,在神经网络训练中采用了先进、有效的变尺度学习算法。最后给出了控制仿真结果。     

车用气体燃料发动机怠速控制优化研究

用模糊控制的思想对气体燃料发动机怠速控制进行了研究。设计了模糊控制系统并进行了试验验证。试验表明:该怠速模糊控制算法较常规控制具有较好的怠速稳定性和排放性能,达到了优化控制的目标。     

模糊控制在发动机怠速控制中应用的研究

作者从提高发动机经济性角度出发，提出应用模糊技术进行怠速控制，使发动机性能指标得到一定改善。提出系统的建立原则并给出系统的大体框架及组成。     

汽油机怠速模糊-PID控制系统研究与分析

为了进一步控制汽油机怠速转速波动,改善怠速控制品质,提出了怠速模糊-PID控制方法,并在Matlab/Simulink软件平台上,搭建了PID控制、模糊控制、模糊-PID三种怠速控制仿真模型,对比分析了各种怠速控制系统的控制响应特性。通过台架试验,对原机控制算法和所设计控制算法下发动机怠速转速进行了对比,验证了该算法的正确性。结果表明:模糊-PID控制系统可以显著缩小转速波动范围,且系统响应更快,载荷切换阶段的转速波动最大幅值小于30 r·min~(–1),稳态波动幅值在±15 r·min~(–1)范围内;与PID控制、模糊控制两种控制方式相比,模糊-PID控制可显著提高怠速控制品质。     

Reducing the idle speed of a gasoline rotary engine with hydrogen addition

This paper presented an experimental study about the idle performance of a rotary engine fueled with hydrogen and gasoline blends. The idle speed was reduced from original 2400 to 2300 and 2200 rpm, and hydrogen energy percentage (β_H2) was varied from 0% to 35.0%. Test results showed that cyclic variation was raised with the decrease of idle speed whereas reduced with the increase of β_H2. Both decreasing idle speed and increasing β_H2 were effective on reducing engine fuel consumption. Total fuel energy flow rate was effectively dropped from 22.4 MJ/h under “2400 rpm and β_H2 = 0%” to 20.01 MJ/h under “2200 rpm and β_H2 = 35.0%”. Combustion duration was reduced through increasing β_H2. HC and CO emissions were dropped with the increase of β_H2, but increased after reducing idle speed. CO₂ emission was decreased after reducing idle speed and adding hydrogen.     

Reducing the idle speed of an SI CNG engine fueled by HCNG with high hydrogen ratio

This paper presents an experimental study aimed at idle characteristics of a CNG engine fueled by HCNG with 55% hydrogen blend. The idle speed was reduced from original 800 r/min to 750 r/min and 700 r/min, and the characteristics of combustion & emissions at reduced idle speed were investigated. It is found that, for the HCNG engine, only reducing idle speed cannot reduce fuel consumption at conditions of fixed λ. In order to reduce fuel consumption and keep the COV at rather low levels, the excess air ratio must be increased properly while reducing the engine idle speed. Due to the large valve overlap (30°) of this inlet inject HCNG engine, CH₄ emissions are mainly caused by scavenging, which account for the vast majority of THC emissions. The emissions of CO, THC and NOx are reduced with the decrease of ignition advance angle at a fixed λ.     

Reducing the idle speed of a spark-ignited gasoline engine with hydrogen addition

Reducing idle speed is an effective way for decreasing engine idle fuel consumption. Unfortunately, due to the increased residual dilution and dropped combustion temperature, spark-ignited (SI) gasoline engines are prone to suffer high cyclic variation and even stall at low idle speeds. This paper investigated the effect of hydrogen addition on the performance of an SI gasoline engine at reduced idle speeds of 600, 700 and 800 rpm. The test results shows that cyclic variation was raised with the decrease of idle speed but reduced obviously with the increase of hydrogen energy fraction (βH₂)$\left({\text{β}}_{{\text{H}}_2}\right)$. Decreasing idle speed and adding hydrogen were effective for reducing engine idle fuel consumption. The total fuel energy flow rate was effectively dropped from 30.8 MJ/h at 800 rpm and βH₂${\text{β}}_{{\text{H}}_2}$ = 0% to 17.6 MJ/h at 600 rpm and βH₂${\text{β}}_{{\text{H}}_2}$ = 19.9%. Because of the dropped fuel energy flow rate causing the reduced combustion temperature, both cooling and exhaust losses were markedly reduced after decreasing idle speed and adding hydrogen. HC and CO emissions were dropped with the increase of βH₂${\text{β}}_{{\text{H}}_2}$, but increased after reducing idle speed. However, NOx emissions were decreased after reducing idle speed and adding hydrogen, due to the dropped peak cylinder temperature.     

Experimental study of the effect of HHO gas injection on pollutants produced by a diesel engine at idle speed

In this study, with the aim of reducing the energy consumption in the production of HHO gas for use in the combustion process of diesel fuel, different modes of gas production were investigated using electrolyzers. According to previous studies, the energy consumption rate of the electrolyzer to produce a high volumetric flow of HHO gas is very high. This high rate will restrict the use of equipment such as high-capacity batteries. The effects of HHO gas injection at the idle speed of the engine at a low temperature were evaluated. Because in this situation, the engine makes high air pollution. The results showed that the percentage of CO, CO2, HC, and NOX gases decreased by 66%, 33%, 38%, and 11%, respectively. On the other hand, the amount of O2 gas in the exhaust increased by 18%. These results were reported for HHO gas injection from 10 to 45 ml/s. The performance of Group Method of Data Handling (GMDH) neural network was desirable in modeling diesel engine pollutants. Because the Root-Mean-Square Error (RMSE) criterion for all evaluated gases is less than 0.32. The GMDH neural network was used for modeling the operation of the diesel engine with HHO supplemental fuel. The GMDH results showed that this artificial network can measure all engine exhaust gases. It can be used as a sensor and virtual simulator for this diesel engine with HHO supplemental fuel.     

A study on the effect of qualitative control coupling variable engine speed on the hydrogen-fueled Wankel rotary engine at wide-open throttle

Hydrogen-fueled Wankel rotary engine, with few available research currently, has excellent power and emission characteristics, however, with lower efficiency. With increasing attention to low-carbon emission, it is of great significance to explore methods to improve the efficiency of hydrogen-fueled Wankel rotary engines. This work aims to study the effect of qualitative control coupling variable engine speeds at the wide-open throttle on the power control. The comparative effect of qualitative control coupling engine speeds from 1000 r/min to 1500 r/min under the wide-open throttle and quantitative control at 1500 r/min on the combustion and emission characteristic of hydrogen-fueled Wankel rotary engine is investigated. The results show that compared with quantitative control, qualitative control coupling variable engine speed can achieve excellent performance. The brake thermal efficiency can be maximally increased by 43.5%, an absolute increase of 6.22%, as well the volumetric efficiency with a maximal 105% improvement. The thermal load and risk of knock can be greatly reduced. Moreover, NO emission also can be reduced by more than an order of magnitude or even by zero. Although there is an increase in cyclic variation, the value is no more than 4%. In addition, qualitative control coupling variable engine speed allows flexible matching of appropriate engine speed and excess air ratio based on the actual requirements of efficiency, stability, durability and emission.     

Energy system feasibility study of an Otto cycle/Stirling cycle hybrid automotive engine

The aim of this study was to investigate the feasibility of utilising a Stirling cycle engine as an exhaust gas waste heat recovery device for an Otto cycle internal combustion engine (ICE) in the context of an automotive power plant. The hybrid arrangement would produce increased brake power output for a given fuel consumption rate when compared to an ICE alone. The study was dealt with from an energy system perspective with design practicalities such as power train integration, location of auxiliaries, manufacture costs and other general plant design considerations neglected. The study necessitated work in two distinct areas: experimental assessment of the performance characteristics of an existing automotive Otto cycle ICE and mathematical modelling of the Stirling cycle engine based on the output parameters of the ICE. It was subsequently found to be feasible in principle to generate approximately further 30% useful power in addition to that created by the ICE by using a Stirling cycle engine to capture waste heat expelled from the ICE exhaust gases over the complete range of engine operating speeds.     

模糊控制算法在燃气轮机控制中的应用研究

利用模糊控制的快速动态响应和PID控制的稳态性能,设计了模糊自适应PID控制算法,实现了对燃气轮机转速的快速跟踪及稳态控制。仿真试验和工程应用均表明该控制算法的响应时间和稳态精度比常规控制算法有明显改善。     

Experimental analysis of a motorbike high speed racing engine

Power gain is the main objective in any motorbike competition. Despite of the wide literature on theoretical and experimental methods for increasing engine power, there is a general lack of data about tests on racing engine performance due to the obvious manufacturers’ reluctance to spread information, especially for recent high technological level applications. This paper, instead, presents all the main results of the experimental tests conducted on a motorbike engine both in the original stock arrangement and in a modified configuration proposed in compliance with the Technical Regulations of the 2007 FIM Road Racing Supersport Italian Championship (CIV). Traditional testing techniques (steady-flow discharge coefficients measurements and chassis dynamometer tests performed in the slow speed ramp mode) are chosen to reduce time and costs and to limit engine wearing while obtaining an acceptable degree of accuracy. It is also proved that the tests to assess the improvements obtained with design changes could not have been completed in the steady-state mode using a single engine because of the short life cycle of racing engines due to wearing, which would have altered the comparisons.     

燃用小桐子油柴油机怠速工况工作过程及循环波动

采用柴油、柴油-小桐子掺混油、小桐子油、高温小桐子油,在单缸水冷四冲程柴油机上进行了怠速工况试验,测录了多循环的瞬时气缸压力与高压油管燃油压力,对比分析了喷油与燃烧过程中各参数的循环波动。结果发现,怠速工况喷油过程中,喷油持续期的循环波动最明显,小桐子油的喷油始点滞后,喷油持续期长,喷油压力大,喷油过程的循环波动略大;怠速工况燃烧过程中,最大燃烧压力升高率和滞燃期的循环波动率最为明显,小桐子油滞燃期略短,燃烧压力升高率小,最高燃烧压力低,滞燃期和最大燃烧压力升高率的循环波动明显大于柴油;燃用小桐子油增大了原机的循环波动,怠速运转不如柴油稳定。