The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 13, 2001
Filed:
Nov. 14, 1997
Chuan He, Columbus, IN (US);
G. George Zhu, Columbus, IN (US);
Dennis O. Taylor, Columbus, IN (US);
Leslie A. Roettgen, Columbus, IN (US);
Mark F. Bares, Oakes, ND (US);
Steven G. Smith, Roseville, MN (US);
Richard D. Johnston, Elizabethtown, IN (US);
Yue Y. Wang, Columbus, IN (US);
Emma Sweetland, Bucks, GB;
James A. Rupp, Elizabethtown, IN (US);
Eric K. Bradley, Columbus, IN (US);
Cummins Engine Company, Inc., Columbus, IN (US);
Abstract
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.