提高化油器产品一致性和重复性水平的思路

在摩托车排放净化系统中,由于各个元件质量的一致性差异较大,往往会出现甲台排放达标而乙台排放不达标、样机排放达标而批量生产不达标的情况。排放净化系统元件的一致性包括：发动机排污一致性、化油器供给发动机混合气浓度一致性、空气滤清器原始进气阻力一致性及消声器排气阻力一致性等,其中以化油器供给发动机混合气浓度一致性尤为重要。     

摩托车节油漫谈

二、化油器的影响化油器是影响油气混合效果的关键元件。通过精调化油器,稀薄燃烧是改善排放的途径之一,但如果简单地过稀调节混合气,将限制或降低发动机的动力性。其实,强调化油器的生产一致性与匹配性的效果也很明显。提高化油器生产与检验要求,减小质量性能散差以确保化油器工作性能可靠；另一方面,化油器的特性应与发动机最佳匹配,化油器的调节应与环境变化有很好的适应性。     

广东佛山维丰内燃机配件有限公司——摩托车节油漫谈

二、化油器的影响 化油器是影响油气混合效果的关键元件。通过精调化油器，稀薄燃烧是改善排放的途径之一，但如果简单地过稀调节混合气，将限制或降低发动机的动力性。其实，强调化油器的生产一致性与匹配性的效果也很明显。提高化油器生产与检验要求，减小质量性能散差以确保化油器工作性能可靠；另一方面，化油器的特性应与发动机最佳匹配，化油器的调节应与环境变化有很好的适应性。     

EQH205化油器生产一致性的影响因素初探

在排放日益严格的当前，对于化油器的匹配精度要求更加苛刻，对于化油器的生产精度也要求更加严格，本文仅以ＥＱＨ２０５化油器为例，从零件精度角度出发，对影响化油器生产一致性的因素进行初步的探讨。     

谈摩托车满足欧Ⅲ排放的系统匹配问题

要满足摩托车欧Ⅲ排放限值要求,可采用多种技术方案,如电喷发动机技术、电控化油器技术、稀薄燃烧技术、精调化油器等,以目前国内摩托车的生产技术水平来看,采取精调化油器的方案达到欧Ⅲ排放限值是最难的,但成本最低。     

摩托车国Ⅲ工况法排放技术路线可行性分析（1）

针对较低原始排放发动机,以稳态工况的过量空气系数控制及催化转化器转化效率为基础,在仅考虑化油器及二次补气阀本身控制误差情况下,分析了化油器技术路线的可行性,并对闭环电喷技术路线进行了对比;从理论和实测两方面分析了过量空气系数对尾气排放控制的关键影响。研究结果表明,相较于成熟的传统闭环电喷技术,化油器方案通过国Ⅲ排放法规不具备可行性。     

摩托车国Ⅲ工况法排放技术路线可行性分析（3）

考虑化油器、发动机及补气阀本身的偏差,二次补气阀不可能给尾气提供散差在3％以内的补气调节量。因此,精调化油器斗缸头补气＋三元催化转化器方案仍不具备通过国Ⅲ排放生产一致性要求。精调化油器＋缸头二次补气＋三元（或两级）催化转化器方案示意图如图14所示,如果使用精调化油器＋缸头补气＋两级催化转化器（氧化催化转化器＋还原催化转化器）方案,使用较浓混合气,     

压力检查是维修电喷发动机的钥匙

电控汽油喷射发动机用电脑控制发动机燃料供给系统，能使发动机的经济性、动力性和排放均比化油器发动机好。该系统的技术含量远比化油器高，虽然故障率很低，但是一旦出现故障，由于所涉及的部件较多，维修难度也会大得多。     

两轮车用发动机达到欧Ⅲ排放标准的技术措施

控制摩托车发动机排气污染是一项系统工程,必须遵循先机内、后机外,内外协调匹配的方针,采用化油器发动机,要满足欧Ⅲ排放标准,必须使化油器、二次补气阀、催化转化器三者有机结合。     

现代汽车发动机的“心脏”——电子燃油喷射系统

一、“心”余力拙 化油器是汽车发动机的“心脏部件”,具有计量燃油、雾化并形成可燃混合气以及控制发动机工作的三大功能。60年代以来,随着社会对汽车的燃油经济性、行驶性,特别是废气排放要求的日益严格,化油器厂商不断地在寻找改进化油器性能的新政策,其中包括采用新材料,先进结构设计,严格控制加工工艺和试验方法,增加多种附加装置等手段,直至目前发展为电子控制化油器,而这一切都难以满足日益严格     

摩托车国Ⅲ车型系统匹配技术的若干问题探讨

运用系统的匹配方法,用传统化油器也能使摩托车整车达到国Ⅲ标准要求,但匹配时应注意：1）试验第1步务必设定好车辆的原始排放需在目标值范围内;2）炭罐试验时务必调整到炭罐在怠速不脱附或脱附量极少;3）在进行催化剂对比实验时,最好取下炭罐;4）根据实际情况合理选用补气方式。     

浅谈摩托车化油器O型密封圈的设计

O型密封圈结构简单、密封可靠、成本低,在摩托车化油器中应用十分广泛,主要作用是静密封,有径向密封和端面密封。在实际应用中,O型密封圈常出现密封不严及装配困难等现象,因此在设计时应特别注意。     

摩托车燃油蒸发污染物排放及控制系统的研究（1）

燃油蒸发排放控制系统不仅仅是一个包含控制部件和较多系统单元、设计结构复杂的系统,还涉及到与摩托车排气污染物排放控制系统的匹配、整车性能的匹配等问题。由于我国燃油蒸发排放标准GB20998—2007与Ⅲ阶段排气污染物排放标准GB14622—2007、GB18176—2007同步实施,建议摩托车企业在新车型开发、发动机设计、化油器匹配及调整时,要综合考虑系统设计,研发出蒸发、尾气排放、车辆动力性能兼顾的技术方案,并广泛开展试验验证。     

切诺基发动机化油器的检查与调整

北京切诺基发动机采用卡特ＹＦＡ单腔、下吸式、三重喉管化油器，该化油结构比较复杂，检查和调整项目较多，难度大，与一般化油器有较大的区别。介绍了该化油器常用的检查与调整方法。     

Pro/E在化油器腔体外侧创建实体体积块的方法

由于命令运用条件上的限制,采用＂特征创建步骤优化＂、＂拉伸实体深度类型＂选取和＂替换曲面特征＂3种方法在腔体外侧创建实体体积块的应用非常有限;而＂复制腔体内侧曲面＂并＂实体化＂,＂曲面相交,切剪＂并＂实体化＂2种方法由于运用上不受条件限制,故在化油器等复杂外形产品的三维建模中得到广泛应用,值得借鉴并推广使用。     

Study on combustion characteristics of lean mixture ignited by diesel fuel injection

We have investigated combustion characteristics of lean gasoline–air pre-mixture ignited by diesel fuel injection using a high compression direct injection diesel engine. Gasoline was supplied as a uniform lean mixture by using carburetors, and diesel fuel was directly injected into the cylinder. It was confirmed that the lean mixture of air–fuel ratio between 150 and 35 could be ignited and burned by this ignition method. As the diesel fuel injection increased, HC concentration decreased, and NO and CO concentration increased. The exhaust gas emission of pollutants could be reduced when lean mixture was ignited by an optimum diesel fuel injection.     

The Influence of Structural Flexibilities on the Straight-running Stability of Motorcycles

A new tyre model for studies of motorcycle lateral dynamics, and three new motorcycle models, each incorporating a different form of structural compliance, are developed. The tyre model is based on “taut string” ideas, and includes consideration of tread width and longitudinal tread rubber distortion and tread mass effects, and normal load variation. Parameter values appropriate to a typical motorcycle tyre are employed. The motorcycle models are for small lateral perturbations from straight running at constant speed, and include (a) lateral compliance of the front wheel in the front forks, (b) torsional compliance of the front forks, and (c) torsional compliance in the rear frame at the steering head about an axis perpendicular to the steering axis.

Results in the form of eigenvalues, indicating modal damping properties and natural frequencies are presented for each model. The properties of four large production machines for a range of forward speeds, and the practicable range of stiffnesses are calculated, and the implications are discussed.

It is concluded that typical levels of structural compliance in models (a) and (c) contribute significantly to the steering behaviour properties of large motorcycles, and their observed behaviour can be understood better in terms of the new results than of those existing previously. Some conclusions relating to optimal structural stiffness properties are also drawn.     

The Influence of Structural Flexibilities on the Straight-running Stability of Motorcycles

SUMMARY

A new tyre model for studies of motorcycle lateral dynamics, and three new motorcycle models, each incorporating a different form of structural compliance, are developed. The tyre model is based on “taut string” ideas, and includes consideration of tread width and longitudinal tread rubber distortion and tread mass effects, and normal load variation. Parameter values appropriate to a typical motorcycle tyre are employed. The motorcycle models are for small lateral perturbations from straight running at constant speed, and include (a) lateral compliance of the front wheel in the front forks, (b) torsional compliance of the front forks, and (c) torsional compliance in the rear frame at the steering head about an axis perpendicular to the steering axis.

Results in the form of eigenvalues, indicating modal damping properties and natural frequencies are presented for each model. The properties of four large production machines for a range of forward speeds, and the practicable range of stiffnesses are calculated, and the implications are discussed.

It is concluded that typical levels of structural compliance in models (a) and (c) contribute significantly to the steering behaviour properties of large motorcycles, and their observed behaviour can be understood better in terms of the new results than of those existing previously. Some conclusions relating to optimal structural stiffness properties are also drawn.     

变刚度抗滑桩性状研究

边坡中各处的滑坡体厚度、滑坡推力、地层抗力等不同,则各处抗滑桩的设置也应有所不同,即应采用变刚度布桩。变刚度抗滑桩有竖向上桩身刚度不一致、横向上桩间距不一致、纵向上桩排距不一致及各桩截面大小不一致四种类型。为模拟滑体的厚度和滑坡推力在横向上分布的不均匀性,建立了抗滑桩加固边坡的三维模型,在模型的左右两侧设置竖立的薄层岩壁,并对设置岩壁边界与未设置岩壁边界的情形进行了比较,发现设置岩壁边界后,滑坡在横向上呈不均匀分布,与实际情况接近。研究了变刚度抗滑桩在桩横向变形、桩弯矩等方面的特性,并与等刚度抗滑桩进行了比较,显示了变刚度抗滑桩加固边坡的优越性。     

浅议技术档案信息的利用、共享与转移

技术档案是人们利用已有技术的重要来源之一,它可以直接转化为生产力,继而产生经济效益。技术档案作为人类文明,理应为所有人共享,但为保证市场经济的有序发展,又必须对利用加以限制,对技术档案的转移在法律上也要加以规范。