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. 17, 2015
Filed:
May. 02, 2011
Nicole Wermuth, Garching Bei München, DE;
Paul M. Najt, Bloomfield Hills, MI (US);
Hanho Yun, Oakland Township, MI (US);
Nicole Wermuth, Garching Bei München, DE;
Paul M. Najt, Bloomfield Hills, MI (US);
Hanho Yun, Oakland Township, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A direct-injection internal combustion engine includes an intake camshaft with a low-lift intake cam and a high-lift intake cam, a variable lift control for selectively operating an intake valve in one of a low-lift intake valve profile with the low-lift intake cam and a high-lift intake valve profile with the high-lift intake cam, a variable cam phase control operative on the intake camshaft for simultaneously controlling the phase of the low-lift intake cam and the high-lift intake cam, an ignition spark control, a fuel injection control, an exhaust gas recirculation control, and an intake throttle control. A method of operating the engine includes operating the engine in one of a) a homogeneous-charge compression-ignition (HCCI) combustion mode including the low-lift intake valve profile, and b) a spark ignition (SI) combustion mode including the high-lift intake valve profile, and within a predetermined range of engine loads and camshaft phasings, wherein the low-lift intake valve profile and the high-lift intake valve profile effect a respective intake airflow in the corresponding HCCI combustion mode and SI combustion mode conducive to stable combustion exclusively through fuel and spark control. The method further includes transitioning between the HCCI and SI combustion modes exclusively through adjustments to the variable lift control, the ignition spark control, and the fuel injection control.