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. 25, 1992
Filed:
Oct. 26, 1989
Perry M Paielli, Milford, MI (US);
Digital Fuel Injection, Farmington Hills, MI (US);
Abstract
An engine fuel delivery control system includes an engine having at least one fuel injector fuel injector responsive to electronic control signals for delivering fuel to the engine cylinders and a plurality of sensor for supplying electrical sensor signals as various functions of engine operating conditions. An electronic engine control unit includes an electronic memory storing engine control parameters in a variety of look-up tables, a microprocessor-based controller for periodically addressing the memory tables and obtaining required control parameters as a function of sensor signal inputs, and circuitry for supplying control signals to the injectors as a predetermined function of the control parameters obtained from the look-up tables. Apparatus for selectively varying the control parameters in the look-up tables includes facility for up-loading selected tables from the engine control unit memory, monitoring engine operation as reflected by addressing of the parameter tables in real time, and selectively initiating a programming mode of operation. In such programming mode of operation, addressing of the control tables is inhibited in the electronic control unit, and the control parameters obtained from the tables immediately prior to onset of the programming mode of operation are employed to supply control signals to the injectors during the programming mode of operation. In this way, engine operation continues uninterrupted during the programming mode of operation.