Gm Global Technolgoy Operations, Inc.

Matthew Squire

Paul Alan Bauerle

Kerfegar Khurshed Katrak

Wenbo Wang

Lan Wang

Kurt D McLain

Joseph M Stempnik

Robert J Genslak

Jinchun Peng

Edward Stuteville

Sharon L Storch

Colin A Roberts

David A Stamm

Kevin T Sharples

A control system for an engine having a catalytic converter includes an energy calculation module that calculates a calculated mass air flow (MAF) of intake air of the engine based on a requested torque and a requested spark timing that correspond to a desired thermal energy of exhaust of the engine, and that determines an expected thermal energy of the exhaust based on the calculated MAF, and an energy residual module that determines a thermal energy residual of the exhaust based on the expected thermal energy and an estimated thermal energy of the exhaust, wherein the estimated thermal energy is based on a measured MAF of the intake air. The control system includes an energy evaluation module that determines a diagnostic result that indicates whether the catalytic converter is operating within a target temperature range based on the thermal energy residual. Related control methods are also provided.

Torque model-based cold start diagnostic systems and methods

A throttle control method includes generating a throttle request based on a drag torque request and setting a throttle command equal to the throttle request when the throttle request is less than a throttle idle maximum. A throttle maximum increase is determined when the throttle request is greater than the throttle idle maximum and the throttle command is determined based on the throttle maximum increase. The throttle is controlled based on the throttle command.

Electronic throttle control (ETC) drag torque request security

An engine control system that regulates operating of an engine of a motor vehicle includes a first module that determines whether a throttle of the motor vehicle is closed and a second module that determines whether the engine is idling while a cruise control is active. A third module selectively inhibits an RPM-based idle speed control of the engine if the throttle is closed and the engine is idling while the cruise control is active.

Cruise idle speed control to enhance low speed and light throttle drivability

Growing community of inventors

Fenton, MI, United States of America

Matthew Squire