A Dynamic Model of a Locomotive Diesel Engine and Electrohydraulic Governor

[+] Author and Article Information
C. I. Rackmil, P. N. Blumberg

Integral Technologies Incorporated, Westmont, IL

D. A. Becker, R. R. Schuller

Electromotive Division—GMC, LaGrange, IL

D. C. Garvey

Woodward Governor Company, Fort Collins, CO

J. Eng. Gas Turbines Power 110(3), 405-414 (Jul 01, 1988) (10 pages) doi:10.1115/1.3240136 History: Received September 01, 1987; Online October 15, 2009


As part of a comprehensive simulation of a prototype locomotive propulsion system, a detailed model has been developed that predicts the dynamic response of an experimental two-stroke, turbocharged and intercooled diesel engine. Engine fueling and brake torque are computed from regression equations derived from an extensive data base. Corrections are applied to the calculated steady-state torque to account for dynamic deviations of in-cylinder trapped air-fuel ratio from the steady-state value. The engine simulation accurately represents the operation of the turbocharger, which is gear-driven at low turbocharger speeds, and freewheels through an overrunning clutch when exhaust energy accelerates the turbocharger beyond its geared speed. Engine fueling level, i.e., rack, is determined from a dynamic simulation of an electrohydraulic governor, which responds to the difference between the desired and the actual engine speeds. The governor representation includes: (1) finite rate of change of engine set speed; (2) load regulator feedback for control of applied engine loads; and (3) fuel limiting under conditions of excessively high load demand. The fundamentals of the engine/governor model are given in the paper along with examples that emphasize the dynamic operation of these particular components.

Copyright © 1988 by ASME
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