The purpose of this SAE Standard is to provide a standardized test procedure for generating engine performance maps in order to facilitate data reporting and data comparisons. An engine performance map is a listing of engine specific fuel consumption, specific exhaust emissions and other variables obtained at specific engine speeds and loads. Engine performance maps as specified by this code are primarily used in the light duty vehicle industry and can be used in fuel economy simulation programs. This document is applicable to both four-stroke spark-ignition (SI) and compression-ignition (CI) engines, naturally aspirated and pressure charged, with or without charge air cooling. The large number of control variables available on modern engines results in large flexibility in calibration, and it is frequently necessary to run part-load maps to explore the relative merits of different control strategies. It is not the purpose of this procedure to attempt to define all of the potential methodologies for engine control during testing. The purpose is to define consistent test conditions, equipment levels and operating points to facilitate accurate comparisons of part-load engine performance among laboratories so that the resulting data can be utilized in analytical simulations to predict vehicle performance, for calibration evaluation and for engine comparison.
This document has been heavily revised to provide the detail necessary to do repeatable part-load testing of engine performance.