Patent application number | Description | Published |
20110138776 | DIESEL ENGINE EXHAUST TREATMENT SYSTEM - A diesel engine exhaust treatment system is provided which includes a diesel oxidation catalyst and a diesel particulate filter, where a first SCR catalyst is positioned at the inlet of the diesel particulate filter, and a second SCR catalyst is coated on the filter. The first and second SCR catalysts each have a low loading, such that a lower backpressure is achieved over the use of a single SCR-coated diesel particulate filter at higher catalyst loadings. The exhaust treatment system also provides effective catalyst efficiency for removal of NO | 06-16-2011 |
20120304751 | METHODS AND SYSTEMS FOR DIAGNOSTICS OF AN EMISSION SYSTEM WITH MORE THAN ONE SCR REGION - Methods and systems for controlling and/or diagnosing an emission control system of a vehicle having a first SCR region upstream of a second SCR region are provided herein. One exemplary method includes, indicating degradation based on a first SCR region performance during a first condition; and indicating degradation based on a second SCR region performance during a second condition, the first condition different than the second condition. In this way, different levels of degradation among different SCR regions may be used to indicate emissions levels have increased above a threshold value, for example. | 12-06-2012 |
20130103286 | SYSTEM AND METHOD FOR SUPPLYING FUEL TO AN ENGINE VIA MULTIPLE FUEL PATHS - A system and method for supplying fuel to an engine is disclosed. In one example, a first controller supplies injector commands to a second controller via an asynchronous serial communication bus. The system may reduce the complexity of supplying two or more fuels to an engine. | 04-25-2013 |
20130192545 | VARIABLE OIL PUMP DIAGNOSTIC - Embodiments for indicating degradation of a piston-cooling jet system are provided. In one example, an engine method comprises indicating degradation of a piston-cooling jet system in response to a relationship between engine speed and oil pressure at maximum oil pump displacement conditions. In this way, engine operation may be adjusted in response to an indicated degradation. | 08-01-2013 |
20140106460 | METHODS AND SYSTEMS FOR DIAGNOSTICS OF AN EMISSION SYSTEM WITH MORE THAN ONE SCR REGION - Methods and systems for controlling and/or diagnosing an emission control system of a vehicle having a first SCR region upstream of a second SCR region are provided herein. One exemplary method includes, indicating degradation based on a first SCR region performance during a first condition; and indicating degradation based on a second SCR region performance during a second condition, the first condition different than the second condition. In this way, different levels of degradation among different SCR regions may be used to indicate emissions levels have increased above a threshold value, for example. | 04-17-2014 |
20140214306 | METHOD AND SYSTEM FOR ENGINE CONTROL - Methods and systems are provided for reducing exhaust temperatures during high engine load conditions in engine systems configured to operate with multiple fuels. Stoichiometric cylinder operation is provided via injection of a gaseous fuel such as CNG. In response to elevated exhaust temperatures, the cylinder is enriched by injecting a liquid fuel, such as gasoline, while maintaining the injection of CNG and while maintaining spark timing at MBT. | 07-31-2014 |
20140277975 | METHOD AND SYSTEM FOR ENGINE CONTROL - Methods and systems are provided for adjusting a transmission shift schedule in engine systems configured to operate with multiple fuels. During low engine speed and high engine load conditions, when an air charge temperature is elevated, engine operation is shifted from gasoline usage to CNG usage. The torque advantage of CNG usage is leveraged to advance a transmission upshift schedule and delay a downshift schedule to improve vehicle responsiveness when operating with CNG only. | 09-18-2014 |
20140311454 | ENHANCED FUEL INJECTION BASED ON CHOKE FLOW RATE - A method is described for adjusting the amount of gaseous fuel injected based on the sonic choked flow rate through a restriction. Because the sonic choke flow rate continues to decrease as tank pressure decreases, the method includes computing the sonic choke flow rate through the restriction based on system variables and enforcing the rate of CNG injection to be less than the sonic choke flow rate through the restriction. Thereby, the mass flow rate to the fuel injector can be substantially maximized to substantially minimize the time for fuel tank emptying, particularly during the last amount of tank emptying when the contents of the gaseous storage tank is low. | 10-23-2014 |
20140358407 | GASEOUS FUEL INJECTOR ACTIVATION - A method for starting an engine is provided. The method comprises in response to an engine start request, cycling a gaseous fuel injector prior to activating a starter motor. In this way, delayed engine starts using gaseous fuel may be mitigated. | 12-04-2014 |
20140358408 | GASEOUS FUEL INJECTOR ACTIVATION - A method for starting an engine is provided. The method comprises opening a throttle valve controlling air flow into an intake manifold in response to a gaseous pressure differential across a gaseous fuel injector exceeding a threshold pressure. In this way, delayed engine starts using gaseous fuel may be mitigated. | 12-04-2014 |
20150046065 | METHOD AND SYSTEM FOR TRANSIENT FUEL CONTROL - Methods are provided for reducing transient fuel issues in a multi-fuel engine system. When transitioning from co-fueling with a first fuel split ratio to co-fueling with an alternate fuel split ratio, the change in fuel split ratio is gradually ramped in over multiple engine cycles. This reduces combustion stability issues and the disturbance potential of a wholesale fuel change. | 02-12-2015 |