1
Vijay Ramappan, Jun Mo Kang, Hanho Yun, Chen Fang Chang: System and method for controlling exhaust gas recirculation systems. June 11, 2013: US08463531 (6 worldwide citation)

A control system for an engine includes a feedback determination module, a feed-forward determination module, and a valve control module. The feedback determination module generates an exhaust gas recirculation (EGR) feedback value based on engine speed and a difference between desired and measured ...


2
Vijay Ramappan, Jesse M Gwidt, Jonathan T Shibata, Stuart R Smith, Michael J Lucido: Multiple injection blend for direct injected engines. GM Global Technology Operations, August 19, 2008: US07415348 (6 worldwide citation)

A fuel injection system for a direct fuel injection engine includes an injection mode module. The injection mode module selects a fuel injection mode to be one of a single injection mode and a dual injection mode. A fuel injection command module transitions between the single and dual injection mode ...


3
Jun Mo Kang, Chen Fang Chang, Allen B Rayl, Vijay Ramappan: Method and apparatus for monitoring an EGR valve in an internal combustion engine. GM Global Technology Operations, June 15, 2010: US07739027 (5 worldwide citation)

An internal combustion engine is selectively operative in a spark ignition combustion mode and a controlled auto-ignition combustion mode. An EGR valve operative to control flow of exhaust gas to an intake manifold is monitored, including commanding the EGR valve to a closed position and monitoring ...


4
Jesse M Gwidt, Michael J Lucido, Vijay Ramappan, Halim G Santoso, Donovan L Dibble, David J Cleary: Multi-injection combustion cycle systems for SIDI engines. July 27, 2010: US07765053 (5 worldwide citation)

The fuel injection system includes a fuel injector that injects fuel directly into a combustion chamber of a cylinder of an engine. The control module initiates multiple fuel injections in a combustion chamber during a combustion cycle of the cylinder via the fuel injector.


5
Vijay Ramappan, Brian R Lovegrove, Philip Allen Karau, Sergio Eduardo Garcia: Method to control auto-ignition in an internal combustion engine equipped with variable valve timing control. Delphi Technologies, Paul L Marshall, November 7, 2006: US07131425 (5 worldwide citation)

A method and control system to accomplish knock control on a multi-cylinder spark-ignition internal combustion engine equipped variable cam phasing system, comprising monitoring cam position, crankshaft position, and, engine knock signal, determining cam position relative to crankshaft position, and ...


6
Jun Mo Kang, Chen Fang Chang, Vijay Ramappan, Allen B Rayl: Control strategy for transitions between homogeneous-charge compression-ignition and spark-ignition combustion modes. GM Global Technology Operations, June 21, 2011: US07963268 (4 worldwide citation)

A method for transitioning a spark-ignition direct injection internal combustion engine between a controlled auto-ignition combustion mode and a homogeneous spark-ignition combustion mode includes operating the engine in a stratified-charge spark-ignition combustion mode during the transitioning.


7
Allen B Rayl, Chen Fang Chang, Peter Kafarnik, Jun Mo Kang, Vijay Ramappan: HCCI combustion moding state control for fuel economy and seamless transitions. Harness Dickey & Pierce, June 1, 2010: US07729844 (4 worldwide citation)

A method and system for controlling an engine includes a spark ignition (SI) control module operating the engine in a spark ignition mode in a high lift valve state and a pre-HCCI control module entering a matching state when homogeneous charge compression ignition (HCCI) mode conditions are met. Wh ...


8
Jesse M Gwidt, Jonathan T Shibata, Vijay Ramappan, Stuart R Smith, Michael J Lucido: Engine cranking system with cylinder deactivation for a direct injection engine. GM Global Technology Operations, January 20, 2009: US07478625 (4 worldwide citation)

An engine cranking system includes fuel injectors that are associated with multiple combustion chambers of an engine. The fuel injectors include a first fuel injector that is associated with a first combustion chamber. A second fuel injector is associated with a second combustion chamber. A control ...


9
Jonathan T Shibata, Vijay Ramappan, Andrew P Bagnasco: Diagnostic systems and methods for fuel injectors in homogenous charge compression ignition engine systems. February 21, 2012: US08118010 (3 worldwide citation)

An engine control system for a homogenous charge compression ignition (HCCI) engine includes a fuel injector temperature determination module and a fuel injector control module. The fuel injector temperature determination module determines a temperature of a tip of a fuel injector based on a first t ...


10
Kevin J Storch, David R Staley, Bryan K Pryor, Vijay Ramappan, Morena Bruno, Roberto Argolini: Control systems for a variable capacity engine oil pump. August 6, 2013: US08499738 (3 worldwide citation)

An oil circulating control system for an engine includes an engine speed module and a mode selection module. The engine speed module determines a speed of the engine. The mode selection module is configured to select a first pressure mode and a second pressure mode of an oil pump of the engine for t ...