Causes of Top Dead Center Error in Marine Generator Engine Power-Measuring Device

Lee, Jiwoong; Jung, Gyun-Sik; Lee, Won-Ju

doi:10.7837/kosomes.2020.26.4.429

Cited by 2 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although the design profile of the fuel injection timing for the engine under this study was unknown, considering that typical medium-speed 4-stroke marine engines have an injection timing of approximately BTDC 15 • CA, the fuel injection timing for the engine in question appeared to be excessively advanced, reaching a maximum of BTDC 21 • CA. Generally, an advanced injection timing can increase P max by prolonging the ignition delay period and improve engine performance [3,7,8]. However, excessively advanced injection timing can lead to abnormal combustion such as knocking, emphasizing the need for appropriate injection timing and ignition delay [9].…”

Section: Diagnosticsmentioning

confidence: 99%

“…The reason for the discrepancy between the calculated engine output through combustion analysis and the measured engine output is due to TDC error. The causes of TDC error can include errors in the encoder pulse waveform, errors in the flywheel TDC mark, loss-angle error due to heat loss caused by the compression process of the actual engine not being adiabatic, loss-angle error due to pressure loss caused by blow-by gas, torsion of the crankshaft, and errors in the connection between the encoder and the crankshaft [1,2,5,8]. When measuring engine output, a TDC error of approximately 10% in diesel engines and approximately 4% in gasoline engines can cause errors in the indicated mean effective pressure of about 1.0 • CA and in the rate of heat release (ROHR) of about 25% [1].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Performance by Excessive Advanced Fuel Injection Timing on Marine Diesel Engine

Baek

Jung²,

Vuong

et al. 2023

Applied Sciences

Self Cite

View full text Add to dashboard Cite

The injection timing of fuel in a diesel engine affects the combustion condition. Advanced fuel injection prolongs the ignition delay, positively impacting the increase in maximum combustion pressure and improving output. However, excessively advanced fuel injection can cause knocking. Moreover, premature ignition results in increased compression work when the maximum combustion pressure occurs before top dead center (TDC). This study aimed to diagnose and rectify starting failures, noise, and vibrations in a commercially operated ship engine by measuring the combustion pressure during low load operation. The target engine was a 4-stroke diesel, and the fuel injection system was mechanically controlled by a camshaft. The measured engine exhibited a 4.5 °CA error between the TDC, determined by the flywheel mark and the actual TDC. This discrepancy was influenced by excessively advanced fuel injection timing. It was confirmed that fuel injection and ignition were excessively advanced in all cylinders. After readjusting the engine by delaying the fuel injection timing by approximately 10 °CA, the combustion pressure was remeasured. The ignition was delayed by approximately 6.5 °CA at the same load, and the ignition intervals were uniformly adjusted. As the ignition timing was retarded, the compression work decreased and the expansion work increased in each cylinder, resulting in improved output across all cylinders. The amplitude of crankshaft angular velocity variation significantly decreased, improving uneven rotational force.

show abstract