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 ...

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 ...

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 ...

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.

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 ...

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.

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 ...

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 ...

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 ...

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 ...