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:
Aug. 21, 2001
Filed:
Dec. 21, 1999
Hyoung-Jin Yoon, Seongnam, KR;
Hyundai Motor Company, Seoul, KR;
Abstract
The present invention is a system and method for detecting engine misfires, but which prevents false detections or non-detection of misfires that occur as a function of driving status parameters such as the rpm of the engine or load. When the output of the engine changes due to misfires while a time duration for each predetermined rotation angle of the crank shaft is continuously measured, a time variation ratio can then be used as a reference value for detecting the misfires. In the event of a variation of engine torque caused by misfires results in an unreliable detection of the variation ratio of the time duration for each rotation angle of the crank shaft because system mechanical characteristics or inertia associated with a driving mode, an optimal phase delay angle is established for each driving mode, and a time duration for a predetermined rotation angle of the crank shaft is used as a correction so as to detect the misfires of the engine, thereby improving reliability of the detection of the engine misfires.