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当量比
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  equivalent ratio
    Without after-treatment, higher HC and CO emission level occur for HCCI fuel with ethanol and the highest HC (30g/kWh) and CO (300g/kWh) under lean mixture with equivalent ratio 0.11. Compared to EGR rate, the equivalent ration has more effect on HC and CO emission level.
    在没有后处理器时,乙醇HCCI燃烧产生较高的HC和CO排放,最高HC(30g/kWh)和CO(300g/kWh左右)排放都出现在当量比为0.11的稀混合气条件下,与EGR率相比当量比对HC和CO排放的影响更为明显。
    Coordinated control of EGR and equivalent ratio for ethanol HCCI engine performance
    当量比和EGR率对乙醇HCCI发动机性能的协同控制
    It is pointed out that,as to the absorptive cataly tic converter that saves NO x When oxygen is enriched and reducing NO x when the rich mixed gas that approaches the equivalent ratio in short time is burning,so air-fuel ratio control is critical and sulfur poisoning is ano ther problem to be resolved;
    指出,对于吸附还原催化器,催化器在富氧时储存NOx及在短时间接近当量比的浓混合气燃烧时还原NOx,因此空燃比控制问题至关重要,还需解决硫中毒的问题;
短句来源
  相似匹配句对
    Coordinated control of EGR and equivalent ratio for ethanol HCCI engine performance
    当量和EGR率对乙醇HCCI发动机性能的协同控制
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    汽车非线性变速转向器
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    A New Machining Method for Variable Speed Ratio Gear Sector of Motor Vehicle
    汽车变速扇齿加工新方法
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  equivalent ratio
The nuclease activity was either suppressed or stimulated in the presence of PCMB depending on the C7H5O2Hg+ to nucleotide equivalent ratio.
      
When Cu(II) bis(isobutyl) dithiocarbamate was used in an equivalent ratio with an initiator, the polymerization of MMA proceeded as a well-controlled process and yielded a monodisperse polymer.
      
When Cu(II) bis(isobutyl) dithiocarbamate was used in an equivalent ratio with an initiator, the polymerization of MMA proceeded as a well-controlled process and yielded a monodisperse polymer.
      
A model approach to inflation is generated through a newIS-LM analogous synthesis of money, output and prices incorporating several capacity equivalent ratio variables of the product, the factor and the money markets.
      
The high contribution of (Ca+Mg) to the total cations, high concentration of dissolved silica, relatively high (Na+K)/TZ+ ratio (0.3) and low equivalent ratio of (Ca+Mg)/(Na+K) suggests combined influence of carbonate and silicate weathering.
      
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The absorptive reducing catalytic conve rt er and the selective reducing catalytic converter which are re-searched much mo re recenlty are introduced.It is pointed out that,as to the absorptive cataly tic converter that saves NO x When oxygen is enriched and reducing NO x when the rich mixed gas that approaches the equivalent ratio in short time is burning,so air-fuel ratio control is critical and sulfur poisoning is ano ther problem to be resolved;as to the selective re-ducing catlytic converter, increasing...

The absorptive reducing catalytic conve rt er and the selective reducing catalytic converter which are re-searched much mo re recenlty are introduced.It is pointed out that,as to the absorptive cataly tic converter that saves NO x When oxygen is enriched and reducing NO x when the rich mixed gas that approaches the equivalent ratio in short time is burning,so air-fuel ratio control is critical and sulfur poisoning is ano ther problem to be resolved;as to the selective re-ducing catlytic converter, increasing the HC to NO x ratio properly,optimizin g the proportion of active metals and their con-t ents,and adding some oxides can all improve the converting ratio of NO x .The thermal stability,vapor poisoning and etc.are also analyzed.The res earch direction in future of Lean-burn catalytic converter is discussed.

介绍了目前研究较多的吸附还原催化器和选择还原催化器。指出,对于吸附还原催化器,催化器在富氧时储存NOx及在短时间接近当量比的浓混合气燃烧时还原NOx,因此空燃比控制问题至关重要,还需解决硫中毒的问题;对于选择还原催化器,适当增大HC/NOx的比值,对活性金属组成配比及含量进行优化或添加某些氧化物,均可提高NOx转化率。对热稳定性及水蒸气中毒等问题也进行了分析,并讨论了稀燃催化器今后的研究方向。

A detailed HCCI combustion model for ethanol fuel is created using chemical kinetic mechanism and thermodynamics data published by the Lawrence Livermore National Lab in the US.The Gear's backward differentiation formulas(BDF) method,in which the step size can be automatically adjusted,is used to solve the complex problem of chemical reaction kinetics.The effects of intake temperature,intake pressure,compression ratio and air/fuel ratio on HCCI combustion characteristics are analyzed.The results provide a basis...

A detailed HCCI combustion model for ethanol fuel is created using chemical kinetic mechanism and thermodynamics data published by the Lawrence Livermore National Lab in the US.The Gear's backward differentiation formulas(BDF) method,in which the step size can be automatically adjusted,is used to solve the complex problem of chemical reaction kinetics.The effects of intake temperature,intake pressure,compression ratio and air/fuel ratio on HCCI combustion characteristics are analyzed.The results provide a basis for simulating and analyzing HCCI combustion process of ethanol fuel.

利用美国Lawrence L ivermore国家实验室公布的乙醇燃烧的复杂化学动力学机理和热力学数据,建立了乙醇HCC I燃烧模型。对模型中复杂化学反应动力学刚性问题采用了能够自动调节步长的Gear向后差分法。分析了进气温度、进气压力、压缩比、当量比等因素对燃烧特性的影响。计算结果对燃用乙醇的HCC I燃烧过程的模拟和分析提供了依据。

>=This paper presents the experiment research about HCCI fueled with ethanol through lean mixture and EGR and preheat method on a modified single cylinder engine from CA6110 diesel engine. The engine performance is discussed under coordinated control in terms of EGR and equivalent ratio. The experiment results show that the HCCI engine with ethanol has higher thermal efficiency in wider fuel/air ratio. When the equivalent ratio is given in the range of 0.11-0.5, engine thermal efficiency is beyond 30% under...

>=This paper presents the experiment research about HCCI fueled with ethanol through lean mixture and EGR and preheat method on a modified single cylinder engine from CA6110 diesel engine. The engine performance is discussed under coordinated control in terms of EGR and equivalent ratio. The experiment results show that the HCCI engine with ethanol has higher thermal efficiency in wider fuel/air ratio. When the equivalent ratio is given in the range of 0.11-0.5, engine thermal efficiency is beyond 30% under each EGR rate. The highest efficiency will reach 60% with EGR rate 50% and equivalent ratio 0.25. In the realizable HCCI working operations, proper EGR and equivalent ratio can limit the NOx emission below 1g/kWh. Without after-treatment, higher HC and CO emission level occur for HCCI fuel with ethanol and the highest HC (30g/kWh) and CO (300g/kWh) under lean mixture with equivalent ratio 0.11. Compared to EGR rate, the equivalent ration has more effect on HC and CO emission level.

利用进气稀释和预热的方法在经CA6110柴油机改造的单缸发动机上进行了乙醇燃料均质压燃(HCCI)的试验研究。本文主要探讨了在EGR和当量比的协同控制下HCCI发动机的性能,试验结果表明,在较宽的混合气浓度范围内,乙醇燃料HCCI发动机产生较高的热效率,各EGR率下在当量比为0.11-0.5范围内指示热效率都在30%以上,当EGR率为50%、当量比为0.25时最高的指示热效率甚至可以超过60%。在可实现HCCI燃烧范围内,EGR和当量比的合理组合可以将NOx排放控制在1g/kWh以下;在没有后处理器时,乙醇HCCI燃烧产生较高的HC和CO排放,最高HC(30g/kWh)和CO(300g/kWh左右)排放都出现在当量比为0.11的稀混合气条件下,与EGR率相比当量比对HC和CO排放的影响更为明显。

 
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