Junseok S Chang

US Patent:

8061318, Nov 22, 2011

Filed:

Sep 25, 2008

Appl. No.:

12/237471

Inventors:

David J. Cleary - Shanghai, CN
Paul M. Najt - Bloomfield Hills MI, US
Craig D. Marriott - Clawson MI, US
Junseok Chang - Rochester Hills MI, US

Assignee:

GM Global Technology Operations LLC - Detroit MI

International Classification:

F01L 1/34

US Classification:

123 9017, 123 9015, 123 9031

Abstract:

An internal combustion engine includes a crankshaft and first and second cam actuated intake valves. A method for operating the engine includes providing a first intake cam configured to actuate the first cam actuated intake valve, and providing a second intake cam configured to actuate the second cam actuated intake valve. The second intake cam is phase adjustable relative to the crankshaft independently of the phase of the first intake cam relative to the crankshaft. A controller is provided and configured to selectively retard the phase of the second intake cam to effect later closing of the second cam actuated intake valve sufficiently to reduce the effective compression ratio of the engine. Additionally, the first intake cam may be phase adjustable relative to the crankshaft independently of the phase of the second intake cam relative to the crankshaft and the controller may additionally be configured to selectively advance the phase of the first intake cam to effect earlier opening of the first cam actuated intake valve sufficiently to increase internal exhaust gas recirculation.

US Patent:

20060005818, Jan 12, 2006

Filed:

Feb 23, 2005

Appl. No.:

11/064320

Inventors:

Tang-Wei Kuo - Troy MI, US
Paul Najt - Bloomfield Hills MI, US
James Eng - Troy MI, US
Junseok Chang - Ann Arbor MI, US
Zoran Filipi - Ann Arbor MI, US
Dionissios Assanis - Ann Arbor MI, US
Orgun Guralp - Ann Arbor MI, US

International Classification:

F02M 25/07
F02B 75/02
F02B 3/00

US Classification:

123568130, 123316000, 123302000

Abstract:

A method is disclosed for expanding the mid load range of a four-stroke gasoline direct-injection controlled auto-ignition combustion engine. The engine includes at least one cylinder containing a piston reciprocably connected with a crank and defining a variable volume combustion chamber including an intake valve controlling communication with an air intake and an exhaust valve controlling communication with an exhaust outlet. A system is employed for variably actuating the intake and exhaust valves. The valve actuating system is employable to operate the intake and exhaust valves with an exhaust re-compression or an exhaust re-breathing valve strategy. A reservoir chamber in communication with the combustion chamber is provided for temporary holding of residual burned gas. Residual burned gas in the combustion chamber and the exhaust outlet enters into the reservoir chamber and then loses thermal energy while in the reservoir chamber before being drawn back into the combustion chamber.

US Patent:

20110088661, Apr 21, 2011

Filed:

Oct 20, 2009

Appl. No.:

12/582304

Inventors:

David P. Sczomak - Troy MI, US
David J. Cleary - Shanghai, CN
Junseok Chang - Rochester Hills MI, US

Assignee:

GM GLOBAL TECHNOLOGY OPERATIONS, INC. - Detroit MI

International Classification:

F02D 7/00
F02M 51/00
F01L 1/34
F02D 17/02

US Classification:

123481, 123491, 123 9015, 123198 F

Abstract:

A cylinder deactivation system comprises a fuel injection module and a cold start control module. The fuel injection module injects a desired amount of fuel into a cylinder of an engine during engine cranking. The cold start control module maintains an intake valve and an exhaust valve associated with the cylinder in respective closed positions while the desired amount of fuel is injected when at least one of an air temperature and a coolant temperature is less than a predetermined cold start temperature.