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. 24, 1998
Filed:
Dec. 13, 1996
Garth M Meyer, Dearborn, MI (US);
Joseph R Asik, Bloomfield Hills, MI (US);
Ford Global Technologies, Inc., Dearborn, MI (US);
Abstract
A method and system for controlling combustion stability for a lean-burn engine having a plurality of cylinders including a plurality of cylinder pairs utilizes a speed sensor for sensing an engine speed and generating a corresponding temperature signal and an air flow sensor for sensing a cylinder air mass and generating a corresponding air mass signal. An average event time for each of the plurality of cylinders is determined, as well as an instantaneous variation in event times between each of the plurality of cylinder pairs. An actual level of engine roughness is determined based on the variation in instantaneous event times from the average event times. A desired level of engine roughness is determined based on the speed signal, the air mass signal, and a desired air/fuel ratio. The engine is then controlled based on the actual level of engine roughness and the desired level of engine roughness so as to directly control the combustion stability of the engine and to indirectly control the air/fuel ratio of the engine.