| Patent application number | Description | Published |
|---|
| 20100082297 | AIR/FUEL MIXTURE IMBALANCE DIAGNOSTIC SYSTEMS AND METHODS - An air/fuel imbalance (AFIM) diagnostic system comprises a first module, an imbalance determination module, and an imbalance diagnostic module. The first module outputs imbalance data samples based on an oxygen signal provided by an oxygen sensor measuring oxygen in exhaust expelled from cylinders of a cylinder bank. The imbalance determination module determines an AFIM value based on the imbalance data samples. The imbalance diagnostic module selectively diagnoses an AFIM in the cylinder bank based on the AFIM value. | 04-01-2010 |
| 20100263438 | CAMSHAFT POSITION MEASUREMENT AND DIAGNOSIS - A method of operating an engine includes determining a relative position between a first camshaft and a second camshaft during a startup event of the engine when the first camshaft is at a first home position and the second camshaft is at a second home position. The first home position is a first preset angular position of the first camshaft relative to a crankshaft. The second home position is a second preset angular position of the second camshaft relative to the crankshaft when the engine is in an OFF state. The method includes generating a first estimate of the first home position. The method also includes diagnosing a mis-build of the engine based on the relative position, the first estimate and a second estimate of the second home position. | 10-21-2010 |
| 20100305831 | METHOD AND SYSTEM FOR ADAPTING SMALL FUEL INJECTION QUANTITIES - A method and system for controlling an engine includes a normal individual cylinder fuel correction determination module determining normal pulse mode individual cylinder fuel corrections in a normal pulse mode. The system also includes a split pulse enable module operating the fuel injectors in split pulse mode having a linear pulse and a ballistic pulse smaller than the linear pulse. The system also includes a split pulse individual cylinder fuel correction determination module determining split pulse mode individual cylinder fuel corrections in the split pulse mode. The system also includes a ballistic pulse adaptation module adjusting ballistic pulse calibration values in response to the normal pulse mode individual cylinder fuel corrections and the split pulse mode individual cylinder fuel corrections to form adjusted ballistic pulse calibration values. | 12-02-2010 |
| 20110016958 | DIAGNOSTIC SYSTEM FOR VALVE ACTUATION CAMSHAFT DRIVEN COMPONENT COMPENSATION - A diagnostic system and method for operating the same includes a pressure monitoring module generating a diagnostic pressure signal and a camshaft driven engine component correction module generating an engine component oil pressure correction signal and generating a corrected diagnostic pressure signal based on the diagnostic pressure signal and the engine component oil pressure signal. The system further includes a diagnostic module generating a failed variable valve lift mechanism signal based on the corrected diagnostic pressure signal. | 01-27-2011 |
| 20110029216 | DIAGNOSTIC SYSTEMS AND METHODS FOR SENSORS IN HOMOGENOUS CHARGE COMPRESSION IGINTION ENGINE SYSTEMS - An engine control system for a homogenous charge compression ignition (HCCI) engine includes an airflow determination module and a sensor diagnostic module. The airflow determination module generates a first plurality of estimates of airflow into the HCCI engine when the HCCI engine is operating in a first combustion mode, wherein the first plurality of estimates are based on an intake manifold absolute pressure (MAP), a mass air flow (MAF) rate, and a camshaft position. The sensor diagnostic module determines a state of at least one of a first plurality of sensors based on a predetermined threshold and differences between one of the first plurality of estimates and others of the first plurality of estimates, wherein the first plurality of sensors includes a MAP sensor, a MAF sensor, and a camshaft sensor. | 02-03-2011 |
| 20110040472 | METHOD AND SYSTEM FOR FUEL INJECTION CONTROL TO REDUCE VARIATION - A method and system for controlling an engine includes a desired fuel mass determination module that determines fuel mass for injection into a cylinder. The system also includes a split determination module that splits the fuel mass into split fuel masses and a pulsewidth determination module that converts the split fuel masses into injection pulsewidths outside of an injector operation exclusion zone. | 02-17-2011 |
| 20110079193 | DIAGNOSTIC SYSTEMS AND METHODS FOR FUEL INJECTORS IN HOMOGENOUS CHARGE COMPRESSION IGNITION ENGINE SYSTEMS - 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 temperature model when the HCCI engine is operating in an HCCI combustion mode, and determines the temperature of the tip of the fuel injector based on a second temperature model when the HCCI engine is operating in a spark ignition (SI) combustion mode. The fuel injector control module controls a fuel injector pulse width based on the determined temperature and a predetermined temperature threshold, wherein the fuel injector pulse width increases when the determined temperature is greater than the predetermined temperature threshold. | 04-07-2011 |
| 20110106405 | METHOD AND SYSTEM FOR DETECTING OPERATING ERRORS IN A VARIABLE VALVE TIMING ENGINE - A method and control module includes a manifold absolute pressure comparison module that determines a function of the manifold absolute pressure and an average manifold absolute pressure for a plurality of cylinders and that compares the manifold absolute pressure parameter to a manifold absolute pressure threshold. The control module includes a misfire event module that compares the misfire parameter to a misfire threshold. A hardware remedy module performs a valve actuation hardware remedy in response to comparing the manifold absolute pressure and comparing the misfire parameter. | 05-05-2011 |
| 20110153181 | SYSTEMS AND METHODS FOR DIAGNOSING VALVE LIFT MECHANISMS AND OIL CONTROL VALVES OF CAMSHAFT LIFT SYSTEMS - A system for diagnosing a switchable roller finger follower (SRFF) and an oil control valve (OCV) includes a signal monitoring module and a fault detection module. The signal monitoring module receives at least one of an individual cylinder fuel correction (ICFC) signal and an air/fuel ratio imbalance (AFIM) signal when: an engine speed signal is within a predetermined range of speed; an engine load signal is within a predetermined range of load; and a charcoal canister vapor signal is within a predetermined range of flow rate. The fault detection module detects a fault of at least one of a SRFF and an OCV based on an exhaust gas recirculation value and at least one of the ICFC and AFIM signals. The ICFC and AFIM signals are generated based on: an engine position signal; and at least one of an oxygen signal and a wide range air fuel signal. | 06-23-2011 |
