上止点

结果表明：双进气道方案局部流动阻力小，在上止点附近有较高的平均流速。

The simulation results show that the double inlet port has smaller local flow resistance and higher average velocity flow near TDC than the single one .

因此排气门在下止点之前打开，在上止点之后关闭。

So the exhaust valve opens before BDC and closes after TDC .

压缩线法求动态上止点根据TDC计算病灶的血流灌注量（PF）。

Algorithm Design on Computing Dynamic Top Dead Center with Compressing Line Method Then the perfusion was calculated .

分析表明，NOx排放实船测试中，对于精确测录的发动机p-φ示功图，通过适当的上止点误差修正，可以用于实船功率测试。

It was indicated by analysis that the accurate indicator diagram after proper TDC correcting can be used to measure the power of on-board diesel engine for NO_x-emission test .

实验分析得出康明斯K38发动机燃烧始点约在上止点前20°CA，结果表明该方法具有稳定性、准确性和可行性。

It can be calculated that the timing of combustion is 20 ° CA before TDC . The result of the experiment shows that this method is steady , precise and effective .

ECU通过检测霍尔传感器的上止点参考信号，利用软件延时方式实现点火提前角的调整，并以排放、动力性为优化目标进行标定。

The calibration and optimization of spark timing are very important in alternative fuel engines on R & D. An ECU detects TDC reference signal of Hall sensor and the software delay is used for adjusting spark timing .

随着喷油提前角向后推迟，TR燃烧系统的NOx排放下降，碳烟排放增加，上止点前11°CA喷油为最佳。

With fuel supply advance angle delaying , the NOx emission of TR decreases and smoke emission increases . In die BTDC 5 0 CA , NOX reduces less than before . The BTDC 11 ° CA is the trade-off of fuel supply advance angle .

压缩线法确定压缩上止点的研究

An Investigation on the Determining of TDC by Compressing Line Method

活塞动态上止点的微接触直接测量法

A Direct Measurement of Piston Dynamic TDC by Slight Contact

用活塞位移确定上止点相位的方法

On the Method of Defining TDC with a Piston Displacement

上止点位置时气缸内流动的简化数值方法

A Simplified Numerical Methodology for the In-Cylinder Flow at the Top-Center Crank Position

重新将发动机调整到上止点处。

Set engine to top dead centre again .

最大摩擦功耗出现在压缩上止点附近。

The maximum friction power loss occurs near the top dead center of compression .

活塞上止点动态测量法

A Method for Dynamic Measurement of Piston TDC

对系统的标定、动态上止点位置的确定、瞬态示功图的平滑方法等诸方面进行了较为详细的探讨，并分析了实验结果。

And the experimental result was analyzed .

转速大于1200r/min时，压缩上止点位置趋于稳定。

TDC tends to be constant when the engine speed is larger than 1200r / min.

柴油机示功图上止点修正的热力学方法研究

A Study of Thermodynamic Method for TDC Correcting in the Indicator Diagram of Diesel Engines

快速寻找校对发动机活塞压缩行程上止点位置的方法

A quick approach of searching for and calibrating the top stop position of engine piston

再次用百分表检查发动机是否位于上止点。

Heck once more with the dial gauge whether the engine is at top dead centre .

同时，上止点标记必须对准曲轴箱上的接头。

At the same time , the TDC marking must be aligned with the joint on the crankcase .

缸套的粘着磨损深度最大值位于第一道环上止点处。

The maximum adhesive wear depth of the cylinder liner lies at the TDC of the first ring .

在确定活塞上止点时，曲轴角度测量仪读数不应该有任何改变。

Following determination of piston Top Dead Center , there should be no alterations to the crankshaft angle gauge .

对于其中的示功图法，探讨了对指示功率有着显著影响的上止点误差修正方法。

For the power measurement with indicator diagram of diesel engine , the methods of TDC correcting were discussed .

在进行发动机燃烧分析时，正确确定发动机动态上止点相位非常重要。

It is very important to identify the engine dynamic top dead center phase in the combusting analysis of IC engine .

计算结果表明，在上止点前较大的曲轴转角范围内，纵剖面流场结构相似。

The results show that the flow field structures on longitudinal section are similar in a certain crank angle range before TDC .

高负荷时放热率曲线型心向上止点靠近，燃烧等容度提高，当量柴油燃料消耗率显著下降；

Moreover , the center of heat release rate curve closes to the top-dead-center under high-load condition and diesel equivalent fuel consumption decreases .

这种标定器与国内外同类产品相比，除了转速可变外，还有一些创新之处：齿数可调、输出幅值可调、同时可以输出每周一个的上止点参考信号。

Comparing to the other kindred products , besides adjustment of speed , the new calibrater can adjust teeth number and output voltage .

对某天然气发动机缸内压力信号、齿盘脉冲信号和上止点脉冲信号进行同步采样。

For a CNG engine , the cylinder pressure signal , gear pulse signal and top dead center pulse signal were simultaneously collected .

研究农明：曲轴转角上止点附近，自由基迅速生成并快速消耗，反应放出大量的热，温度度迅速升高。

Results showed that free radicals were generated and consumed quickly near TDC , lots of heat was released and the temperature increased rapidly .

发动机活塞静态上止点位置精度的影响因素及其两次等高测量法

The factors affecting the position accuracy of top dead centre of the engine piston in static condition and the method of two equivalent height determination