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. 31, 1999
Filed:
Aug. 14, 1997
Applicant:
Inventors:
Ralf Magiera, Neuenrade, DE;
Christof Howold, Iserlohn, DE;
Assignee:
AFT Atlas Fahrzeugtechnik GmbH, Werdohl, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01M / ; G01L / ; F02B / ;
U.S. Cl.
CPC ...
73 497 ; 73115 ; 73116 ; 731173 ; 73 47 ;
Abstract
The invention relates to a method for selectively testing leakage of combustion chambers in cylinders of internal combustion chambers when the engine is operated with the combustion process suppressed. The internal combustion engine is provided with means for measuring the crank shaft rotation angle and for measuring the instantaneous rotational speed of the crank shaft and wherein the leakage of the combustion chambers is tested during expansion of the gas mixture during the combustion stroke and/or during compression of the gas mixture during the compression stroke of the cylinders of the internal combustion engine.