Estimating Diesel Engine Performance by indirect Methods Conference Paper uri icon


  • The feasibility of using exhaust temperatures and injector nozzle needle lift duration to predict power output and fuel consumption of a diesel engine was investigated using an instrumented John Deere 4440 tractor. Using data obtained during a series of PTO dynamometer experiments, regression models were determined correlating the needle lift duration, exhaust temperatures, and engine speed with the parameters of interest. The models were subsequently tested under normal tractor operating conditions on a commercial farm. Fuel flow and engine power output were accurately predicted from engine speed and needle lift duration and both these variables could be measured using one needle lift sensor. Engine power estimation from exhaust temperature measurements proved unsatisfactory due to the slow speed of response to changes in engine load. Copyright 1987 Society of Automotive Engineers, Inc.

name of conference

  • 1987 SAE International Off-Highway and Powerplant Congress and Exposition

published proceedings

  • SAE Technical Paper Series

author list (cited authors)

  • McKiernan, M., Lalk, T. R., Stout, B. A., & Searcy, S. W.

citation count

  • 2

complete list of authors

  • McKiernan, Michael||Lalk, Thomas R||Stout, Bill A||Searcy, Stephen W

publication date

  • September 1987