NASA启动生物燃料测试

美国国家航空和宇宙航行局（NASA）已经启动对几种非食物植物生物燃料的一系列飞行测试，以此来了解它们对喷射发动机排放量和性能的影响。该测试开始于2月28日，NASA在一架配备有各种仪器的DC-8飞机上进行该实验，测试过程中一架带有各种测试仪器的FalconHU-25对其进行跟踪监测。这种生物燃料主要来自于亚麻植物，它是芥末与油菜的亲缘植物。同时，它也是合油种子植物的亲缘植物，

保时捷2010年将推出Cayenne S Hybrid

保时捷汽车公司（Porsche AG）发布了有关将于2010年推出Cayenne S Hybrid的更详细信息。通过在内燃发动机和变速器之间采用电动机的并行全混合动力设计，保时捷发动机可在完全不使用内燃机的情况下速度最高可达138km／h。这一工程性的成就使CayenneSHybrid无需内燃机就能够以行驶在高速公路上的速度进行自由侧倾，或者“滑行”，极大地减少了发动机排放量和矿物燃料的消耗。

Performances and emissions of a petroleum coke oil slurry engine

In order to solve the failure of fuel system when using petroleum coke oil slurry (PCOS) in a R180 diesel engine directly,a petroleum coke oil slurry fuel system (PCOSFS) was developed and installed in R180 engine,which was called PCOS engine.In order to analyze performances and emissions of the PCOS engine,a comparative experiment between PCOS engine fueled with PCOS and R180 engine fueled with diesel oil was carried out.The results show that the PCOS engine can run smoothly,the maximum output power decreases by about 6.2% and 19.0% and the maximum brake thermal efficiency reduces by around 5.85% and 4.13% as compared to R180 engine under the conditions of 1 200 and 1 600 r/min.The HC emissions of PCOS engine are lower than those of R180 engine at 1 200 r/min,and are close to those of R180 engine at 1 600 r/min.The CO emissions are similar to R180 engine at 1 200 and 1 600 r/min.The smoke intensity is close to R180 engine at 1 200 r/min,and is higher than R180 engine at 1 600 r/min.The particles emitted from PCOS engine array sparsely,but particles emitted from R180 engine array closely,cohering together.

The experimental study on combustion characteristics and emissions of a CMM fueled engine

In this paper, an experimental study on combustion characteristics and emissions of a single cylinder spark ignition engine fueled with coal-mine methane （CMM） is investigated under various loads. CMM is simulated by the compressed nature gas（ CNG）/nitrogen blend fuels. Based on experiment results, it is shown that under 0% - 35% nitrogen volume fraction in CNG/nitrogen blends, the maximum cylinder pressure, the maximum rate of pressure rise and the rate of heat release decrease, the flame propagation period increases, the center of heat release curve is closed to the top dead centre （TDC）markedly with the increase of nitrogen volume fraction. Meanwhile, the hydrocarbon （HC）, CO emissions increase, the NOx emission decreases apparently with the increase of nitrogen volume fraction.

The Fuel Temperature Variation Used as Fuel Diesel-Palm Oil Mixtures under Constant Fuel Consumption

This work examines the effect of fuel temperature in the gas emissions that is used in a four-stroke diesel engine under maximum constant fuel consumption. The fuel temperatures that were used are 20 ℃, 30 ℃, 40 ℃, 50 ℃, 60 ℃, 70℃ and 80 ℃. The engine was functioned under full load condition when it was using different mixtures of diesel-palm oil as fuel. For those fuel temperatures and for any mixture of fuel the gas emissions of carbon monoxide （CO）, hydrocarbons （HC）, nitrogen monoxide （NO） and rotate speed of engine are examined.

立足技术前沿——康明斯推出欧Ⅳ排放标准解决方案

欧洲2005年开始实施欧Ⅳ排放标准,最近也传出对之后拟执行的欧Ⅴ标准要提出更高的技术要求。为了满足法规要求,欧美各大公司正紧锣密鼓地研制更经济、更环保的商用车柴油机。

Effect of a semi electro-mechanical engine valve on performance and emissions in a single cylinder spark ignited engine

In this study, an electro-mechanical valve （EMV） system for the intake valve ofa fottr stroke, single cylinder, overhead valve and spark ignition （SI） engine was designed and constructed. An engine with the EMV system and a standard engine were tested to observe the effects of the EMV on engine performance and emissions at different speeds under full load. The EMV engine showed improved engine power, engine torque and break specific fuel consumption （BSFC）. A 66% decrease in CO emissions was also obtained with the EMV system, but hydrocarbons （HC） and NOx emissions increased by 12% and 13% respectively.