发动机状态监测与故障诊断专家系统翻译

1、Diesel Enginesinternal combustion gasoline enginees run on a mixture of gasoline and air . the ideal mixture is 14.7 parts air to one part of gasoline we are talking about a whole lot of air and tiny bit of oil . one part of oil that is completely vaporized into 14.7 parts of air can produce tremend

2、o u S power it is then distributed through a series of passages called the intake manifold，to each cylinder . at some point after the air cleaner，Depending1.Engine typethe engines can be classified in the following several ways : operating cycle；Piston actionPiston connection圆柱体ArrangementMethod of

3、fuel injection，and speed。(1)操作系统diesel and gas-burning engines can be divided into two groups based on the number of piston strokes per cycle，Either four or two . an engine which new(2) piston actionan engine s piston action may be classified as single-action，double-action，or opposed-piston .single-

4、acting engines use only one and end of the cylinder and one face of the piston to develop power . this working space is At the end away from cramTherefore，double-acting enginees are built only in large and comparatively low-speed units，Generally to power motor ships . an opposedThe upper pistons dri

5、ve one，the lower pistons the other。note that each piston is single-acting；That is，it develops power with only one face of the piston。(3) piston connectionthe piston may be connected to the upper end of the connecting rod either directly(trunk piston type)，Or indirectly (cross head type)intrunk-pisto

6、n engines，A horizontal pin within the piston is encircled by the upper end of the connecting rod。this by far the most common construction . in cross head Gines，the piston fastens to a vertical piston rod whose lower end is attached to a sliding mend(4) cylinder arrangementthe four basic cylinder arr

7、angements of a diesel or gas-burning engine are : cylinder-in-line；v-arrangement；Flat，and radial . a cylinder-in-line arrangement . this is The simplest and most common arrangement，With all cylinders arranged With two connecting rods attached to each crank pin Permits reducing The engine length by a

8、lmost one-half，thus making it much more rigid (A complete circle is 360)A flat engine is A v-engine with the angle between the banks increased to 180.this arrangement is used where there is little headroom bus，And rail cars . flat engines are also called opposed-cylinder enginees(5) method of fuel i

9、njectiondiesel engines are divided into Air-injection engines and solid or mechanical injection engines . Air-injection engines use a blast on Air to bll(6)速度all diesel and gas-burning engines may be divided into three classes according to speed；Low-speed、medium-speed、and high-speed engines . automotive diesel engines often run faster than 1200 rpm、But the great