| Patent application number | Description | Published |
|---|
| 20080307851 | EXHAUST TEMPERATURE SENSOR MONITORING - A system for diagnosing an exhaust temperature sensor in an engine exhaust, the exhaust further including an emission control device, the system comprising an exhaust temperature sensor disposed in the exhaust pathway for indicating temperature; an air/fuel ratio sensor having a heater, the air/fuel ratio sensor disposed in the exhaust pathway; and a control system, the control system enabling and disabling the air/fuel ratio sensor heater based on operating conditions, the controller further adjusting fuel injection to provide a desired air-fuel ratio based on feedback from the air/fuel ratio sensor when the heater is enabled, and determining degradation of the exhaust temperature sensor based on a signal from the air/fuel ratio sensor when the heater is disabled. | 12-18-2008 |
| 20090182488 | Temperature Sensor Diagnostics - A system for an internal combustion engine of a vehicle includes an emission control device in an exhaust stream of the engine; an exhaust gas oxygen sensor coupled upstream of the emission control device; a temperature sensor coupled adjacent the emission control device; and a controller coupled to the exhaust gas oxygen sensor and the temperature sensor, the controller identifying degradation of the temperature sensor responsive to the exhaust gas oxygen sensor during lean operation, where the controller operates the exhaust gas oxygen sensor in a temperature sensing mode to identify the degradation of the temperature sensor. | 07-16-2009 |
| 20090194076 | Reducing Fuel-Vapor Emissions by Vortex Effect - A system for managing fuel vapors generated in a fuel system of a vehicle, the fuel system including a fuel tank includes a flow separator comprising an inlet to which a gas flow having fuel vapors is admitted, at least two outlets, and an internal cavity, the inlet, the outlets, and the internal cavity configured to separate the gas flow, with at least one outlet flow becoming warmer and at least one outlet flow becoming cooler than the inlet flow; a first path coupling the warmer outlet to an engine of the vehicle; a second path coupling the cooler outlet to the fuel tank; and a third path coupling the fuel tank to the inlet. | 08-06-2009 |
| 20090241925 | Air/Fuel Imbalance Monitor Using an Oxygen Sensor - Air/fuel imbalance monitoring systems and methods for monitoring air/fuel ratio imbalance of an internal combustion engine having a plurality of engine cylinders are provided herein. An example of the method may include routing exhaust gas from a first group of cylinders to an exhaust gas oxygen sensor, and during selected operating conditions, indicating that air/fuel of at least one cylinder in the first group is imbalanced based on a response of the exhaust gas oxygen sensor at frequencies at or above firing frequency of the cylinders in the first group. An example of the system may include an exhaust gas oxygen sensor positioned in such a way that exhaust gas from the group of engine cylinders are routed to the exhaust gas oxygen sensor, and a controller configured to during selected operating conditions, indicate that air/fuel of at least one cylinder in the group is imbalanced based on a response of the exhaust gas oxygen sensor at frequencies at or above firing frequency of the cylinders in the group. | 10-01-2009 |
| 20110166765 | METHOD AND SYSTEM FOR FUEL VAPOR CONTROL - A method and system for fuel vapor control in a hybrid vehicle (HEV). The HEV fuel vapor recovery system includes a fuel tank isolation valve, which is normally closed to isolate storage of refueling from storage of diurnal vapors. The method for fuel vapor control includes selectively actuating the fuel tank isolation valve during interrelated routines for refueling, fuel vapor purging, and emission system leak detection diagnostics to improve regulation of pressure and vacuum the HEV fuel vapor recovery system. | 07-07-2011 |
| 20110168140 | METHOD AND SYSTEM FOR FUEL VAPOR CONTROL - A method and system for fuel vapor control in a hybrid vehicle (HEV). The HEV fuel vapor recovery system includes a fuel tank isolation valve, which is normally closed to isolate storage of refueling from storage of diurnal vapors. The method for fuel vapor control includes selectively actuating the fuel tank isolation valve during interrelated routines for refueling, fuel vapor purging, and emission system leak detection diagnostics to improve regulation of pressure and vacuum the HEV fuel vapor recovery system. | 07-14-2011 |
| 20110290000 | METHOD AND SYSTEM FOR FUEL VAPOR CONTROL - A method and system for fuel vapor control in a hybrid vehicle (HEV). The HEV fuel vapor recovery system includes a fuel tank isolation valve, which is normally closed to isolate storage of refueling from storage of diurnal vapors. The method for fuel vapor control includes selectively actuating the fuel tank isolation valve during interrelated routines for refueling, fuel vapor purging, and emission system leak detection diagnostics to improve regulation of pressure and vacuum the HEV fuel vapor recovery system. | 12-01-2011 |
