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:
Sep. 08, 1998
Filed:
Oct. 31, 1996
William Joseph Bolander, Ortonville, MI (US);
Robert Leonard Morris, Livonia, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
Automotive internal combustion engine ignition timing control operations for varying timing of engine cylinder combustion chamber ignition events models the lead-lag combustion chamber temperature change profile under a transition from a first to a second engine operating condition and varies ignition timing following the transition in response to the temperature change profile. The lead-lag profile is implemented by applying a step change in ignition timing followed by a more gradual timing change, such as along a first order lag trajectory, toward a final ignition timing following the transition, and is updated in synchronism with engine cylinder events to account for a dependence on engine speed.