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:
Nov. 19, 2002
Filed:
May. 22, 2001
AFT Atlas Fahrzeugtechnik GmbH, Werdohl, DE;
Abstract
A process for the cylinder-selective leakage testing of the combustion chambers of a combustion engine is carried out during engine operation, but with the combustion process being suppressed. From the time progression of an engine shaft speed value, engine shaft speed differentials are determined respectively for each cylinder. Then a respective value for the compression pressure is allocated to each engine shaft speed differential. Preferably, the respective engine shaft speed differential is determined as the difference between the minimum engine shaft speed immediately following the top dead center position of a respective cylinder and the subsequent maximum engine shaft speed for this cylinder.