Abstract:
Systems, apparatus, and methods are disclosed that include a divided exhaust engine with at least one primary exhaust gas recirculation (EGR) cylinder and a plurality of non-primary EGR cylinders. The systems, apparatus and methods control the fueling to the at least one primary EGR cylinder in response to EGR fraction reduction conditions.
Abstract:
Systems and methods for internal combustion engine operation with exhaust gas recirculation and turbocharging are disclosed. The systems include an exhaust gas recirculation loop for recirculating exhaust gas flow from a first portion of the cylinders of the engine into an intake system prior to combustion. The system further includes a turbine with first and second inlets for receiving exhaust gas flows from respective first and second parts of the exhaust gas of the remaining portion of the cylinders.
Abstract:
An engine control system is provided, comprising: an engine control module (“ECM”) coupled a gearbox and at least one accessory powered by an engine, the ECM being configured to detect a shift event by the gearbox and to respond to the shift event by causing the at least one accessory to move to a high load condition, thereby reducing an amount of torque provided by the engine to the gearbox.
Abstract:
Systems, methods and techniques for exhaust gas recirculation are provided. The system includes mixing exhaust flow from at least one cylinder of an engine with air in an air intake system prior to combustion. The exhaust flow from the at least one cylinder is accumulated prior to mixing and distributed into the intake air system in a controlled manner.
Abstract:
A system and method of inducing an operational response change in an operating direct-injection internal combustion engine is provided such that the engine includes a cylinder into which liquid fuel injection is directly performed. The method starts by operating the direct-injection engine using a start of injection (SOI) protocol. At some point during operation, it is determined that a change is desired for a first parameter of engine operation that is at least partially a function of a charge provided to the cylinder (such as the torque output). In response an operational response in the engine is induced by altering the SOI protocol via a first SOI alteration that alters the volumetric efficiency of the cylinder and changes the first parameter.
Abstract:
Systems, apparatus, and methods are disclosed that include a divided exhaust engine with at least one primary EGR cylinder and a plurality of non-primary EGR cylinders. The systems, apparatus and methods control the amount of recirculated exhaust gas in a charge flow in response to EGR fraction deviation conditions.
Abstract:
Systems and methods for fuelling a plurality of cylinders of an internal combustion engine are disclosed. The system includes an exhaust gas recirculation system for recirculating exhaust gas flow from at least one primary EGR cylinder of an engine into an intake system prior to combustion. The system further includes a fueling system to provide a first flow of a first fuel to each of the plurality of cylinders and a second flow of a second fuel to each of the primary EGR cylinders that is in addition to the first flow of the first fuel.
Abstract:
A system includes an internal combustion engine having a number of cylinders, with at least one of the cylinders plumbed to have a complete recycle of the exhaust gases from the cylinder. The system further includes the completely recycled cylinder having an EGR stroke cycle, and the non-recycled cylinders of the engine having an exhaust stroke cycle. The system includes the EGR stroke cycle being distinct from the exhaust stroke cycle. An amount and composition of the exhaust gases from the recycled cylinder are distinct from the amount and composition of the exhaust gases from the non-recycled cylinders, at least at certain operating conditions of the engine.
Abstract:
A system includes an internal combustion ignition engine with an exhaust gas flow, a particulate filter in the exhaust gas flow, a NOx reduction catalyst in the exhaust gas flow downstream of the particulate filter, a first oxygen sensor coupled to the exhaust gas flow downstream of the NOx reduction catalyst, and a second oxygen sensor coupled to the exhaust gas flow between the particulate filter and the NOx reduction catalyst. A controller includes an exhaust conditions module that interprets a first oxygen signal from the first oxygen sensor and a second oxygen signal from the second oxygen sensor and a combustion control module that commands a high engine-out air-fuel ratio when the first oxygen signal indicates a low oxygen content and commands a low engine-out air-fuel ratio when the first oxygen signal indicates a high oxygen content.
Abstract:
Systems and methods for thermal management of a direct injection propane fuel system are disclosed that include control a temperature of the fuel tank at or below a desired operating temperature to avoid venting of fuel to atmosphere.