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:
May. 13, 2008
Filed:
Mar. 02, 2006
Tang-wei Kuo, Troy, MI (US);
Zongxuan Sun, Troy, MI (US);
Jun-mo Kang, Ann Arbor, MI (US);
James A. Eng, Troy, MI (US);
Chen-fang Chang, Troy, MI (US);
Barry L. Brown, Lake Orion, MI (US);
Paul M. Najt, Bloomfield Hills, MI (US);
Man-feng Chang, Troy, MI (US);
Tang-Wei Kuo, Troy, MI (US);
Zongxuan Sun, Troy, MI (US);
Jun-Mo Kang, Ann Arbor, MI (US);
James A. Eng, Troy, MI (US);
Chen-Fang Chang, Troy, MI (US);
Barry L. Brown, Lake Orion, MI (US);
Paul M. Najt, Bloomfield Hills, MI (US);
Man-Feng Chang, Troy, MI (US);
GM Global Technology Operations, Inc., Detroit, MI (US);
Abstract
A method is provided for control of transition between combustion modes of a direct-injection engine operable in a homogeneous charge compression ignition (HCCI) mode at lower loads and a spark ignition flame propagation (SI) mode at higher loads. The engine includes a variable valve actuation system including two-step high and low lift valve actuation and separate cam phasing for both intake and exhaust valves. The method includes operating the engine at steady state, with fuel-air-exhaust gas mixtures at predetermined conditions, for each speed and load, and controlling the engine during mode changes between the HCCI mode and the SI mode by switching the exhaust and intake valves between low lift for HCCI operation and high lift for SI operation. High load may be an SI throttled mode with an intermediate unthrottled mode (SI/NTLC} in which transition between HCCI and SI/NTLC modes requires switching only the exhaust valve lift and transition between SI/NTLC and SI throttled modes requires switching only the intake valve lift, with predetermined phase adjustments in the valve timing phasing.