发动机

Based on the fundament of analyses of abroad and our country CNG engine technology, the developing strategy of CNG engine has suggested. Based on the EQD180-20 diesel which the basic construction unchanged, the necessary modified designing for CNG engine was made which included combustion system, intake and exhaust system, cylinder head, piston, and turbocharger.

在分析国内外天然气发动机技术的基础上，提出了满足国3排放的电控喷射单燃料CNG发动机开发方案；以EQD180-20柴油机为基础机型，在基本不改变原机结构的前提下，对燃烧系统、进排气系统、气缸盖、活塞和增压中冷系统进行相应的变型设计；采用稀薄燃烧、增压中冷、低涡流燃烧系统、电控分组点火、开环控制、电控CNG喷射系统和氧化型催化器等技术，降低排放，保持天然气发动机的动力性和经济性。

Its advantages are: the structural design of a reasonable and practical, ingenious novel, which directly use the engine to act as cooling fan blower, on the engines to increase oxygen, and at the same time make use of cooling water tank into the engine's temperature has increased, more conducive to fuel combustion conditions, improve the thermal efficiency.

它的优点是：结构设计合理实用，构思新颖巧妙，它直接利用发动机冷却风扇充当鼓风机，对发动机进行了加氧，同时又利用了冷却水箱使进入发动机的气温有所提高，更有利于燃油燃烧的条件，提高了热效率。

Engine work, if crude oil filter was a serious blockage of impurities, or due to low temperatures when the oil viscosity changes, the main oil缺油Road will be the engine will lose lubrication, this is very dangerous, especially in the main bearings and connecting rod bearings, if there is no oil will be burned, bearing alloy heat due to friction loss and even journal welded together, eventually forcing the engine to stop working.

发动机工作时，若机油粗滤器被杂质严重淤塞，或者由于气温低而机油粘度变大时，主油道就会缺油，发动机就会失去润滑，这是很危险的，特别是主轴承和连杆轴承，如果没有润滑油会烧坏，轴承合金会因摩擦发热而流失，甚至和轴颈熔焊在一起，最终迫使发动机停止工作。

The requirements for the specific impulse and mass-to-thrust ratio of the bipropellant and tripropellant engine are studied, and the calculated isolines of vehicle dry mass variation with the average engine specific impulse and the sea-level engine mass-tothrust ratio are also given.

探讨了单级人轨运载器对液氧／液氢发动机和液氧／煤油／液氢三组元发动机比冲和质推比的需求，计算给出了运载器干质量随发动机比冲和质推比变化的等值线图。

Turbulence in air or water caused by the motion or action of an oar, propeller, jet, or airfoil.

压式喷气发动机一种简单的，主要为管道式的喷气发动机，如喷压式发动机

The engine fuel shutoff valve is controlled by the engine start lever and the engine fire warning switch.

发动机燃油关断活门由发动机起动手柄和发动机火警开关控制。

The engine fuel shutoff valve is controlled by the engine start lever and the engine fire warning switch.

当发动机燃油关断活门关闭时，位于前顶置面板上的& CLOSED&门由发动机起动手柄和发动机火警开关控制。

The system includes Valvetronic mechanism and VANOS mechanism,which can continually adjust valve timing and lift in a dimension.

该系统包括Valvetron ic机构和VANOS机构，能够在一定的范围内连续调节气门的正时与升程，实现发动机的无节气门负荷调节，降低了发动机的泵气损失，改善了发动机的性能。

The system include Valvetronic mechanism and VANOS mechanism, it continually adjusts valve timing and lift in a dimension.

该系统包括Valvetronic机构和VANOS机构，能够在一定的范围内连续调节气门的正时与升程，实现发动机的无节气门负荷调节，降低了发动机的泵气损失，改善了发动机的性能。

When the swirl variable device is part-opened, because swirl has some effect on the second injection, second injection timing has distinctly effect on fuel consumption, and the fuel consumption change fluctuantly with twice injection timing. When the tumble variable device is adopted, second injection timing also has effect on fuel consumption, but there is only one point that the fuel consumption is lowest. When the load is bigger, the second injection point where the fuel consumption is lowest is earlier than the smaller load.

在可变涡流结构中，当阀片处于非全开状态时，由于涡流运动对二次喷油的作用，二次喷油正时对发动机的比油耗存在明显影响，发动机比油耗随喷油正时改变呈较明显的波动状；在可变滚流结构中，二次喷油正时对发动机比油耗同样存在影响，但最低油耗点只有一个，当负荷较大时，最低比油耗所对应的喷油正时要更早一些。

Life. But the intrinsic way of the Internet by wire confines accessing and using of the network information.

然而，Internet固有的有线连接方式大大限制了人们对网络信息的访问和使用。

I have a strong persuasion that this is true .

我坚信这是正确的。