Abstract Errors in the cylinder gas pressure due to zero drift, and changes in sensitivity caused by thermal stresses were investigated. Five quartz-crystal pressure transducers, of different makes and designs, were used in a single-cylinder diesel engine to measure the cylinder gas pressure and determine the instantaneous frictional torque and frictional mean effective pressure. All pressure data were obtained by using calibration constants determined from a dead-weight tester at atmospheric conditions, according to the manufacturer's specifications. Errors in the pressure caused by steady and transient variations in the transducer temperature were investigated under simulated engine conditions. The calibration of the transducer which gave the best performance was made at elevated temperatures. A new calibration constant was determined. The error in the instantaneous frictional torque due to the calibration at atmospheric conditions was determined. Presented as a Society of Tribologists and Lubrication Engineers paper at the ASME/STLE Tribology Conference in Tortono, Ontario, Canada, October 8–10, 1990 Notes Presented as a Society of Tribologists and Lubrication Engineers paper at the ASME/STLE Tribology Conference in Tortono, Ontario, Canada, October 8–10, 1990

Reciprocating motion

10.1080/10402009208982150

Cite

Citations (7)

Effect of Cetane Number with and without Additive on Cold Startability and White Smoke Emissions in a Diesel Engine

SAE technical papers on CD-ROM/SAE technical paper series (1999)

Hiroaki Hara Yasuhiko Itoh Naeim A. Henein Walter Bryzik

Cetane number

White (mutation)

10.4271/1999-01-1476

Cite

Citations (35)

An Investigation on Sensitivity of Ignition Delay and Activation Energy in Diesel Combustion

Umashankar Joshi Ziliang Zheng Amit Shrestha Naeim A. Henein Eric Sattler

The auto-ignition process plays a major role in the combustion, performance, fuel economy and emission in diesel engines. The auto-ignition quality of different fuels has been rated by its cetane number (CN) determined in the CFR engine, according to ASTM D613. More recently, the Ignition Quality Tester (IQT), a constant volume vessel, has been used to determine the derived cetane number (DCN) to avoid the elaborate, time consuming and costly engine tests, according to ASTM D6890. The ignition delay period in these two standard tests and many investigations has been considered to be the time period between start of injection (SOI) and start of combustion (SOC). The ignition delay (ID) values determined in different investigations can vary due to differences in instrumentation and definitions. This paper examines the different definitions and the parameters that effect ID period. In addition the activation energy dependence on the ID definition is investigated. Furthermore, results of an experimental investigation in a single-cylinder research diesel engine will be presented while the charge density is kept constant during the ID period. The global activation energy is determined and its sensitivity to the charge temperature is examined.

Cetane number

Ignition timing

10.1115/icef2014-5587

Cite

Citations (3)