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首页> 外文会议>2001 International gas research conference >FUEL EFFICIENT NATURAL GAS ENGINE WITH COMMON-RAIL MICRO-PILOT INJECTION FOR HEAVY-DUTY AND STATIONARY APPLICATION
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FUEL EFFICIENT NATURAL GAS ENGINE WITH COMMON-RAIL MICRO-PILOT INJECTION FOR HEAVY-DUTY AND STATIONARY APPLICATION

机译：高效重油燃油天然气发动机的通用导轨微动注射及固定应用

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In the recent years, it has become obvious that one of the main fields of interest in alternate fuels is the public transportation sector. Natural Gas seems to be advantageous. It is available and environmentally friendly, even if the greenhouse effect of methane is considered. The operation range of vehicles running on CNG (Compressed Natural Gas) is poor due to the large pressure vessels, but in case of urban buses with low daily mileage this is acceptable. On the other hand, the use of an environmentally friendly fuel is favorable especially in urban areas.rnAlthough there are some advantages of Natural Gas, diesel buses dominate the market. The reason is the better part-load fuel efficiency of the Diesel principle which is superior to the Otto-cycle due to the absence of engine throttling. The efficiency levels of Spark-Ignition (SI) -type, Lean Burn Natural Gas engines are quite comparable to diesel engines during full load conditions. The penalty in on-Road fuel consumption results from the 60...80% share of idle/low load engine operation.rnTo overcome this, throttling in Natural Gas Engines should be reduced or eliminated. In a supercharged Lean-Burn engine, load in the upper load range can be influenced to a certain degree via waste-gate or VNT control. The low load/idle operation requires a stratified charge instead of the homogenous charge at high loads. One way to do this is a Pilot Injection-type engine, if the injection equipment is optimized to small diesel amounts to replace the spark plug with 13% of the energy share at full load and 100% at idle conditions.rnTo demonstrate the potential of such an engine, FEV has set up a demonstration engine with a Common-Rail Injection System. The 6-cylinder HD engine is supercharged and intercooled. Unlike conventional Dual-Fuel Engines, the emission level in steady-state operation is below Euro V (valid 2008) except methane, comparable to SI engines. On the other hand, unlike conventional SI engines, the fuel consumption is similar to diesel engines.
机译：近年来，很明显，替代燃料的主要关注领域之一是公共交通部门。天然气似乎是有利的。即使考虑了甲烷的温室效应，它也是可用的并且对环境友好。由于压力容器大，在压缩天然气（CNG）上行驶的车辆的运行范围较差，但是对于日行驶里程较低的城市公交车，这是可以接受的。另一方面，特别是在城市地区，使用环保燃料是有利的。尽管天然气有一些优势，但柴油客车在市场上占主导地位。原因是柴油原理的部分负荷燃油效率更高，由于没有发动机节流，因此优于汽油循环。在满负荷条件下，火花点火（SI）型稀燃天然气发动机的效率水平与柴油发动机相当。怠速/低负荷发动机运行中60 ... 80％的份额是造成道路燃油消耗的惩罚。要解决此问题，应减少或消除天然气发动机的节流。在增压贫燃发动机中，较高的负载范围内的负载可通过废气门或VNT控制在一定程度上受到影响。低负荷/怠速运行需要分层装料，而不是高负荷下的均质装料。实现这一目标的一种方法是先导喷射式发动机，如果将喷射设备优化为少量柴油，以在满负荷和空转情况下分别以13％的能量份额和100％的空转率代替火花塞。在这种发动机上，FEV建立了带有通用导轨喷射系统的演示发动机。 6缸高清发动机是增压和中冷的。与传统的双燃料发动机不同，稳态运行时的排放水平低于甲烷（欧洲甲烷）（2008年有效），甲烷除外，与SI发动机相当。另一方面，不同于常规的SI发动机，燃料消耗类似于柴油发动机。

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