Cummins Engine Company, Inc.

James A Rupp

Mark F Bares

Yue Yun Wang

Leslie A Roettgen

Dennis O Taylor

Eric K Bradley

Chuan He

G George Zhu

Steven G Smith

Emma Sweetland

Richard D Johnston

A system and method for diagnosing output power of an internal combustion engine includes means for diagnosing potential causes of low engine output power or torque and means for estimating actual engine output power or torque. In a preferred embodiment of the diagnosis of engine output power, low engine output power is first investigated for authenticity to verify whether a low engine output power condition exists. If one exists, a zero fueling engine cranking test is conducted to determine whether relative compression values for each of the cylinders are within specification, and any problems associated therewith are corrected by service personnel. If the low engine output power problem is not corrected in accordance with the engine cranking test, a snap-throttle cylinder balancing test is conducted to balance the relative power contribution from each cylinder. If the cylinder balancing test does not correct the low engine output power problem, a road test is conducted to estimate the actual engine output power for comparison with a rated engine output power over a desired range of engine speeds.

System and method for diagnosing output power of an internal combustion engine

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Elizabethtown, IN, United States of America

James A Rupp