An internal combustion engine has a control device, an EGR valve that adjusts an EGR rate, a PCV valve that adjusts an opening degree of a first PCV passage that communicates an inside of a crankcase and a downstream side of a throttle valve. The control device operates the throttle valve in a closing direction in response to a deceleration request. The control device adjusts an opening degree of the PCV valve based on an immediately preceding EGR rate immediately before reception of the deceleration request.

An internal combustion engine has a control device, an EGR valve that adjusts an EGR rate, a PCV valve that adjusts an opening degree of a first PCV passage that communicates an inside of a crankcase and a downstream side of a throttle valve. The control device operates the throttle valve in a closing direction in response to a deceleration request. The control device adjusts an opening degree of the PCV valve based on an immediately preceding EGR rate immediately before reception of the deceleration request.

Methods and systems are provided for diagnosing degradation of an exhaust valve coupled to an engine cylinder. In one example, a method may include, routing compressed air from an electric booster into a cylinder with the intake valve of the cylinder open and the exhaust valve closed, and indicating degradation of the exhaust valve based on an exhaust airflow relative to a baseline airflow.

A system and method for controlling operation of an internal combustion engine having at least one fuel injector. A controller is configured to selectively command the at least one fuel injector to deliver a primary fuel injection of a first fuel quantity and a secondary fuel injection of a second fuel quantity. The first fuel quantity is above a predefined threshold and the second fuel quantity is at or below the predefined threshold. The controller is configured to command a primary pulse width and a secondary pulse width, based in part on a respective desired fuel injection mass and respective initialized values of fuel injector slope. Operation of the fuel injectors is controlled based in part on a converged primary fuel injector slope and a converged secondary fuel injector slope determined at partially from a comparison of a calculated fuel mass and an estimated fuel mass.

An imbalance detection device is provided. An obtainment process includes obtaining a rotation waveform variable based on a detection value of a sensor that detects a rotational behavior of a crankshaft, and an air-fuel ratio detection variable in each of a plurality of first intervals. A calculation process includes calculating an imbalance variable based on an output of a mapping having a value obtained by the obtainment process as an input. The imbalance variable indicates a degree of variations in an air-fuel ratio of the internal combustion engine. The rotation waveform variable indicates a difference between instantaneous speed variables that are variables corresponding to the rotational speed of the crankshaft in each of the second intervals.

A method for performing condition-based maintenance of an engine is presented. The method includes obtaining one or more parameters corresponding to the engine. Also, the method includes determining a temperature profile corresponding to a portion of a fluid flow component based on a first parameter and one or more thermal models. The method further includes estimating a solid deposit in the portion of the fluid flow component corresponding to each cycle of the engine based on the temperature profile and deposition kinetics parameters. Further, the method includes predicting a total solid deposit in the portion of the fluid flow component based on the estimated solid deposit corresponding to each cycle of the engine. Moreover, the method includes performing the condition-based maintenance of the engine based on a value of the predicted total solid deposit.

A method for performing condition-based maintenance of an engine is presented. The method includes obtaining one or more parameters corresponding to the engine. Also, the method includes determining a temperature profile corresponding to a portion of a fluid flow component based on a first parameter and one or more thermal models. The method further includes estimating a solid deposit in the portion of the fluid flow component corresponding to each cycle of the engine based on the temperature profile and deposition kinetics parameters. Further, the method includes predicting a total solid deposit in the portion of the fluid flow component based on the estimated solid deposit corresponding to each cycle of the engine. Moreover, the method includes performing the condition-based maintenance of the engine based on a value of the predicted total solid deposit.

A method for an enhanced vehicle monitoring system that utilizes cameras and other sensors to determine the state of the interior and/or exterior of a vehicle is provided. The method comprises detecting that a driver has exited a vehicle. The method further comprises monitoring a state of the vehicle. The method further comprises determining based, at least in part, on the monitoring, if an object has been left in the vehicle unintentionally or if the vehicle has been left running unattended. The method further comprises, upon determining that the object has been left in the vehicle or the vehicle has been left running unattended, sending a notification to the driver.

A method for an enhanced vehicle monitoring system that utilizes cameras and other sensors to determine the state of the interior and/or exterior of a vehicle is provided. The method comprises detecting that a driver has exited a vehicle. The method further comprises monitoring a state of the vehicle. The method further comprises determining based, at least in part, on the monitoring, if an object has been left in the vehicle unintentionally or if the vehicle has been left running unattended. The method further comprises, upon determining that the object has been left in the vehicle or the vehicle has been left running unattended, sending a notification to the driver.

Methods and systems are provided for reducing driver dissatisfaction from NVH associated with cylinder deactivation. Audio and video feed is captured from inside a vehicle and analyzed to infer if a vehicle operator is distracted. If yes, then a VDE transition is scheduled to occur during the time when the driver is distracted and unlikely to notice the NVH.