| 1. | Modern engine thin - petrol technique
现代发动机稀燃技术 |
| 2. | Leb lean - burn engine
稀燃发动机 |
| 3. | Lean - burn engine is operated at air - fuel ( a / f ) ratios of 21 : 1 and above , in addition , ignition is delayed , as a result of these technique , the nox emissions are very low
同时，本研究也成功地运用了由原位合成技术制作的分子筛堇青石整体式分子筛催化器，去除稀燃nox排放。 |
| 4. | Investigations on a lean burn engine show that nox can be removed by using hc and co in the exhaust gas as reducing agents . when the catalyst is used , the rate of nox conversion can reach a maximum of 74 . 4 % at 400
稀燃发动机台架实验结果表明，催化剂抗硫中毒、抗高温以及抗水蒸气能力较强；最大nox转化效率达74 . 4 % ；最大nox转化率排气温度点在400附近。 |
| 5. | First in an 150 - 550 temperature range , the influence of oxygen concentration , space velocity and propene concentration on the no conversion was investigated and then also the macro kinetics of propene oxidization and no reduction
本文研究了在pt al _ 2o _ 3催化剂上进行的hc - scr反应，用以稀燃发动机尾气的治理。首先在150 - 550温度范围内考察了氧气浓度、空速及还原剂浓度对no转化的影响。 |
| 6. | Investigations also show that the catalyst shows good heat resistance in the presence of water and demonstrates high capability for mitigating sox poisoning . in the end , a novel way controlling combustion is employed in a 1 . 342l s . i . engine , in which lean - burn , fast burn ( tumble ) and delay ignition make the engine provide much cleaner exhaust gas than that of a conventional premixed s . i . engine
最后综合采用机内净化和排气后处理并行策略，即稀燃、快燃（滚流） 、推迟点火的可控燃烧新方案，结合分子筛稀燃催化器，在稀燃发动机典型工况下，在保证燃油经济性较原机改善14 . 8 %时， nox的排放大幅降低。 |
| 7. | Main characteristic and innovative points : 1 . the sensitivity analysis is first to applied in the reaction mechanism reduction of lpg combustion under premixed lean burn , that is , finding a reduced mechanism that only relates the principal component and skeletal mechanism but can produces similar predictions of detailed mechanism
本文主要特色及创新之处如下： 1运用chemkin对化学反应机理进行简化的能力，首次将敏感度分析法用于lpg在稀燃条件下化学机理的简化，确定关键组分和主要反应，并把这个简化机理应用到star - cd中进行计算。 |
| 8. | Through adjusting the controlling fuel injection - - regulations of the two injection timings and proportions , an adequate air and fuel charge stratification was produced - we call it quasi - homogenous mixture and the lean burn was successfully realized in a product 4 - valve s . i . engine whose structures are n ' t changed at all . investigations show that twice electronic fuel injection can make the lean limit ( a / f ) increase by 1 . 5 - 2 units ; the fuel consumption and exhaust emissions are improved remarkably , in partial load , compared with the product 4 - valve s . i
研究结果表明：两次喷油可拓展发动机稀燃极限1 . 5 - 2个空燃比单位，最高达23 . 5 ；发动机燃油消耗同原电喷发动机相比可降低19 . 1 % ；整个空燃比范围内，经过优化的两次喷油稀燃的最低油耗较单次喷油稀燃下降6 . 5 %左右，各种排放物机内生成量均有大幅度下降。 |
| 9. | The paper introduces development and research of foreign gas engines and describes briefly lean - burn combustion , egr , structure of pre - combustion as well as application of turbocharger and miller cycle and analyzes the effect of the technologies on emission and efficiency of engines
本文介绍了目前国外气体机的发展技术研究现状，并对稀燃技术、 egr技术、预燃室的结构、增压器的采用和米勒循环的应用等技术作了简要介绍，简要的分析了这些技术对发动机的排放、效率的影响。 |
| 10. | Engine , the fuel consumption decreases by about 19 . 1 % . on the other hand , the fuel consumption of quasi - homogenous mixture lean combustion decreases by about 6 . 5 % compared with homogenous lean mixture combustion . three - ways catalyst ( twc ) + optimizing afr technology is used to remove nox emissions in oxygen containing exhaust gas
本研究运用三效催化器+空燃比优化控制技术，利用三效催化器能一定程度降低nox排放的特点，控制发动机在优化空燃比下工作，将稀燃后排气中剩余不多的nox进一步催化。 |
