GM GLOBAL TECHNOLOGY OPEARATIONS, INC.
|GM GLOBAL TECHNOLOGY OPEARATIONS, INC. Patent applications|
|Patent application number||Title||Published|
|20120011925||ENGINE HEATER USE DETECTION SYSTEMS AND METHODS - A diagnostic system includes a temperature derivative module and a heater use module. The temperature derivative module determines a derivative of a temperature of one of a fluid of an engine of a vehicle and a component of the engine measured by a temperature sensor after a vehicle startup event. The heater use module selectively indicates that an engine heater was used before the vehicle startup event based on the derivative.||01-19-2012|
|20110061363||EXHAUST DIAGNOSTIC SYSTEMS AND METHODS FOR RESETTING AFTER OPERATION WITH POOR REDUCTANT QUALITY - An exhaust diagnostic system includes a selective catalyst reduction (SCR) efficiency testing module that determines an efficiency of a SCR catalyst. An exhaust gas temperature management module selectively adjusts a temperature of the SCR catalyst to a predetermined temperature range using intrusive exhaust gas temperature management. A test enabling module initiates an SCR efficiency test using the SCR efficiency module after failing a prior SCR efficiency test and while the temperature of the SCR catalyst is within the predetermined temperature range.||03-17-2011|
|20100031739||METHOD OF MEASURING TORSIONAL DYNAMICS OF A STEERING COLUMN AT SMALL DYNAMIC AMPLITUDES - A method for measuring low amplitude dynamic properties of a steering column includes mounting the steering column into a test fixture and performing test runs. The test runs include subjecting the input end of the steering column to input excitations and measuring output conditions, which include at least one of acceleration, velocity and position, and determining whether the output conditions are within a predetermined output range. Input excitations may include sinusoidal excitations having a selected frequency range, torque, or displacement; or dither excitations. The selected torque or displacement is determined using open loop calculations from the output conditions, to achieve target acceleration levels. Data is interpreted to determine the natural frequency or rim gain of the steering column, which are compared to predetermined permissible ranges. The maximum steering wheel rim gain permissible level may be equal to approximately 1 divided by the polar moment of inertia of the wheel.||02-11-2010|
|20090118977||CYLINDER FUELING COORDINATION FOR TORQUE ESTIMATION AND CONTROL - An engine control system comprises a torque control module and a fueling control module. The torque control module selectively generates a deactivation signal for a first cylinder of a plurality of cylinders of an engine based on a torque request. The fueling control module halts fuel delivery to the first cylinder based on the deactivation signal. The torque control module increases a spark advance of the engine at a first time after the fueling control module halts fuel injection for the first cylinder. The first time corresponds to an initial time combustion fails to occur in the first cylinder because fuel delivery has been halted.||05-07-2009|
Patent applications by GM GLOBAL TECHNOLOGY OPEARATIONS, INC.