An engine misfire mitigation system is disclosed. The engine misfire mitigation system may include a sensor system; a fuel system to provide fuel to the engine; and an engine control module to: estimate an air pressure of a combustion chamber of the engine based on measurements from the sensor system, determine a probability that a threshold amount of hydrocarbons are present in an exhaust system of the engine based on the air pressure of the combustion chamber, determine that a fuel injection pressure is to be adjusted based on the probability that the threshold amount of hydrocarbons are present in the exhaust system of the engine and the air pressure of the combustion chamber, and cause the fuel system to reduce the fuel injection pressure.

Methods and systems are provided for a ducted fuel injector. In one example, a method may include adjusting a temperature of combustion chamber gases in a combustion chamber and/or adjusting a fuel rail pressure in response to an amount of light sensed by a photodiode of the duct.

Unique engine controls and apparatuses, methods and systems relating to the same are disclosed. One embodiment is method which utilizes an in-cylinder [O2] mass fraction model to generate exhaust gas recirculation (EGR) fraction references for both transient and steady state operating conditions. Further embodiments, forms, objects, features, advantages, aspects, and benefits shall become apparent from the following description and drawings.

The present invention relates to a method for determining engine operation parameter values during and/or after a gear shift operation prior to performing said gear shift operation. The method comprises the steps of, prior to the gear shift operation: determining initial conditions comprising torque demand and engine speed and certain other engine operation parameter values; providing said initial conditions to an engine operation simulation model; providing a torque development course as well as an engine speed development course during the intended gear shift operation to said engine operation simulation model; and determining desired engine operation parameter values by means of said engine operation simulation model based upon the information thus provided to said engine operation simulation model.

An exhaust gas recirculation (EGR) control method includes a valve duty differentiated control including: detecting, by a controller, an engine operation region, a mixer region, and an external factor region as a valve control condition for an EGR valve duty correction variable for controlling an EGR system; applying, by the controller, the EGR valve duty correction variable to an EGR valve duty, which is set by a target air amount to an intake air amount, to calculate a minimum EGR valve duty; and outputting, by the controller, the calculated minimum EGR valve duty to an EGR valve as the EGR valve duty.

A fuel injection control device causes an injector to execute main injection or pilot injection toward a joint portion, and low penetration injection to inject fuel at timing earlier than the pilot injection in a PILOT region or at timing later than the main injection in an AFTER region. The fuel injection control device causes the low penetration injection to be executed to inject the fuel only in a radial central region of a combustion chamber.

Technical solutions described herein includes an exhaust system for treating exhaust gas from an internal combustion engine in a motor vehicle. The exhaust system includes a gas particulate filter, and a controller that controls soot loading estimation for the gas particulate filter. Controlling the soot loading estimation includes checking validity of soot loading estimation, and in response to the soot loading estimation being invalid, initiating a remedial action to limit soot deposition on the gas particulate filter. The remedial action includes determining a temperature at an inlet of the gas particulate filter, and if the temperature is within a predetermined range, inhibiting a deceleration fuel cut off of the internal combustion engine.

A port injection valve injects fuel into an intake passage. An intake synchronous injection is to inject fuel in synchronization with an opening period of an intake valve. A single injection process is to execute only an intake air non-synchronous injection. A majority of a fuel injection period of the single injection process is prior to the opening timing of the intake valve. A controller causes, when switching a fuel injection process from the single injection process to a multiple injection process, an injection start timing of the intake air non-synchronous injection to be more advanced than an injection start timing of the single injection process prior to the switching.

A method and system for determining remaining useful life of an in-use injector of a reciprocating engine is disclosed. The method includes determining nozzle wear relationship data for different duty cycles of the in-use injector, and using the nozzle wear relationship data together with operating parameters for the reciprocating engine, and emission relationship data to determine actual emission levels for the in-use injector based on the wear relationship data and the emission relationship data. The method and system further include determining remaining useful life of the in-use injector based on actual emission levels and the nozzle wear relationship data; and controlling an operation of the reciprocating engine based on the actual emission levels.

Various methods and systems are provided for controlling emissions. In one example, a controller is configured to respond to a sensed exhaust oxygen concentration by changing a fuel injection timing to maintain particulate matter (PM) within a range, and then adjusting an exhaust gas recirculation (EGR) amount based on NOx sensor output and based on the change in fuel injection timing.