Gm Global Technolgoy Operations, Inc.

Daniel S Dimoski

Vijay A Ramappan

J Michael Gwidt

Daniel P Himes

Brian P Hannon, Jr

Haresh Dayaljee Varu

Methods and systems are provided for controlling a drive system in a hybrid electric vehicle. In an exemplary embodiment, the drive system has combustion engine and an electric motor, and a method includes: obtaining, via one or more sensors, sensor data pertaining to the hybrid electric vehicle; determining, via a processor, whether cold start emission reduction is required, based on the sensor data; and providing an increase in torque provided by the electric motor, via instructions provided by the processor to the drive system, when it is determined that the cold start emission reduction is required.

Method and system for controlling cold start emission reduction

A system providing an approach for catalytic converter warmup mode is applicable to multiple vehicle applications including hybrid vehicles. The system determines exhaust enthalpy during conditions including transient engine speed and transient engine load for a catalytic converter receiving exhaust output from an engine. Multiple exhaust parameter measurement devices each measure exhaust conditions entering the catalytic converter. A processor receives output from each of the exhaust parameter measurement devices and continuously calculates an enthalpy of the catalytic converter. The calculated enthalpy of the catalytic converter is repeatedly compared to a predetermined enthalpy threshold required to achieve catalytic light-off saved in a memory.

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Bloomfield Hills, MI, United States of America

Daniel S Dimoski