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:
Jan. 03, 1995
Filed:
Nov. 12, 1992
Julian A LoRusso, Grosse Ile, MI (US);
Jeffrey A Cook, Dearborn, MI (US);
Peter S Szpak, Ann Arbor, MI (US);
Jessy W Grizzle, Ann Arbor, MI (US);
Ford Motor Company, Dearborn, MI (US);
Abstract
A control apparatus and method for maintaining equal air flow among cylinders and independently controlling the air/fuel ratio of each individual cylinder, in an internal combustion engine having variable valve control. An air fuel controller generates valve control signals for each individual cylinder by sampling the exhaust gas oxygen sensor, and correlating the samples with corresponding combustion events. The valve lift for each variable lift valve is corrected to operate each cylinder at the desired air flow and air/fuel ratio. The variable valve lift can be accomplished in a camshaft type system incorporating a lost motion mechanism or similar device, or a system incorporating direct electrohydraulic or electromechanical valve actuation without a camshaft. The system and method can provide further flexibility in cylinder to cylinder air/fuel ratio control by combining it with a variable pulse width electronic fuel injector capability.