A fuel system for an internal combustion engine includes a fuel control system having a fueling control unit structured to determine a test point on a tip wear-sensitive region of a fuel injector delivery curve, and store measurements of pressure drops in a pressurized fuel reservoir caused by injections of fuel at the test point. The fueling control unit is further structured to produce an injector health signal based on the stored measurements of pressure drop. Related methodology and control logic for calculation of wear parameters for injection signal duration electronic trimming and prognostic health determinations are also disclosed.

Provided is a dual-fuel engine control system including: a sensing unit for generating sensing information by sensing a parameter related to a dual-fuel engine; a main control unit for generating a control signal for controlling a micro-pilot injection value and a gas fuel inlet valve by analyzing a state of the dual-fuel engine on the basis of the sensing information; an EFI control unit for controlling the micro-pilot injection value and the gas fuel inlet valve on the basis of the control signal; and a deep learning unit for analyzing a state of the dual-fuel engine on the basis of the control signal transferred from the main control unit and the sensing information transferred to the main control unit at a time point of generating the control signal, and transferring an analysis result to the main control unit and the EFI control unit.

An internal-combustion engine includes an EGR device that recirculates a portion of exhaust gas, as EGR gas, from an exhaust passage to an intake passage through an EGR valve. A control device for the control device is configured to perform: EGR ratio estimation processing that calculates, by using an estimation model, an estimated EGR ratio; and estimation model update processing that updates the estimation model. The estimation model is configured to calculate the estimated EGR ratio based on a pressure parameter being a ratio of or a difference between gas pressures upstream and downstream of the EGR valve. The pressure parameter is represented by a pressure parameter model that is updatable. The estimation model update processing includes: calculating an actual EGR ratio; and updating the pressure parameter model such that the estimated EGR ratio becomes closer to the actual EGR ratio.

Provided is a dual-fuel engine control system including: a sensing unit for generating sensing information by sensing a parameter related to a dual-fuel engine; a main control unit for generating a control signal for controlling a micro-pilot injection value and a gas fuel inlet valve by analyzing a state of the dual-fuel engine on the basis of the sensing information; an EFI control unit for controlling the micro-pilot injection value and the gas fuel inlet valve on the basis of the control signal; and a deep learning unit for analyzing a state of the dual-fuel engine on the basis of the control signal transferred from the main control unit and the sensing information transferred to the main control unit at a time point of generating the control signal, and transferring an analysis result to the main control unit and the EFI control unit.

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.

A fuel injection control device for an internal combustion engine includes an electronic control unit configured to execute division processing for learning for dividing a requested injection amount into an injection amount of partial lift injection of an in-cylinder injection valve and a port injection amount of injection of a port injection valve, detect, on the basis of at least one of a terminal electric potential of a coil and a current flowing through the coil, an inflection point of a change in induced electromotive force of the coil in time attributable to a decline in a relative speed of a mover with respect to the coil, and correct the energization processing at a time when the partial lift injection is executed based on a timing of the detection of the inflection point.

A control method for a vehicle injector includes an injection time determination step in which a controller determines whether it is necessary for multiple injectors to inject fuel according to a combustion cycle of a combustion chamber, an individual injection step in which the controller controls each of the multiple injectors to individually inject fuel at different times when the controller determines in the injection time determination step that it is necessary for the injectors to inject fuel, and a simultaneous injection step in which the controller controls each of the multiple injectors to simultaneously inject fuel after the multiple injectors individually inject fuel at different times in the individual injection step.

An internal-combustion engine includes an EGR device that recirculates a portion of exhaust gas, as EGR gas, from an exhaust passage to an intake passage through an EGR valve. A control device for the control device is configured to perform: EGR ratio estimation processing that calculates, by using an estimation model, an estimated EGR ratio; and estimation model update processing that updates the estimation model. The estimation model is configured to calculate the estimated EGR ratio based on a pressure parameter being a ratio of or a difference between gas pressures upstream and downstream of the EGR valve. The pressure parameter is represented by a pressure parameter model that is updatable. The estimation model update processing includes: calculating an actual EGR ratio; and updating the pressure parameter model such that the estimated EGR ratio becomes closer to the actual EGR ratio.

A method and a device for supplying fuel into a combustion chamber of a cylinder of an internal combustion engine, in which an air-fuel mixture is supplied to the cylinder via at least two intake sections, which are connected to the cylinder via an intake valve, and each of the intake sections is assigned an injector, fuel being injected into the intake sections in at least intermittently asynchronous manner.

A control method for a vehicle injector includes an injection time determination step in which a controller determines whether it is necessary for multiple injectors to inject fuel according to a combustion cycle of a combustion chamber, an individual injection step in which the controller controls each of the multiple injectors to individually inject fuel at different times when the controller determines in the injection time determination step that it is necessary for the injectors to inject fuel, and a simultaneous injection step in which the controller controls each of the multiple injectors to simultaneously inject fuel after the multiple injectors individually inject fuel at different times in the individual injection step.