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http://dx.doi.org/10.7467/KSAE.2012.20.6.061

Analysis of Engine Operation Condition by Using Coastdown Test under Gear Engaged Condition  

Shim, Beom-Joo (Graduate School Department of Mechanical Engineering, Kyunghee University)
Park, Kyoung-Suk (Department of Mechanical Engineering, Kyunghee University)
Park, Jun-Su (R&D Center, Ssangyong Motor Company)
Min, Byeong-Du (R&D Center, Ssangyong Motor Company)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.20, no.6, 2012 , pp. 61-66 More about this Journal
Abstract
Conventional method to transform vehicle driving condition to engine operation mode is to use vehicle road load under neutral gear and mechanical efficiency of drivetrain. But this method requires additional measurement of efficiency of drivetrain on a test rig. And this measurement is normally done at fixed speed and thus estimated accuracy of engine operation mode is not considered to be high enough. This study suggests new method to calculate engine operation mode for prescribed driving mode such as NEDC using vehicle coastdown test under gear engaged condition without measurement of mechanical efficiency of drivetrain. Coastdown test was done under neutral and gear engaged condition for comparison and also trial to extract mechanical loss of drivetrain was carried out. Calculated engine torque by conventional and newly suggested method was compared with actually measured torque of a vehicle on a chassis dynamometer during NEDC. Newly suggested method showed slightly higher accuracy of accumulated brake work during NEDC.
Keywords
Coastdown test; Gear engaged condition; NEDC; Efficiency of drivetrain; Brake work;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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