A control device for an internal combustion engine comprising a combustion control part controlling a fuel feed system and ozone feed system so as to form a difference in ozone concentration space-wise or time-wise in a combustion chamber 11 so that premixed gas burns by compression ignition in stages in the combustion chamber and an ozone malfunction judging part judging malfunction of the ozone feed system. The ozone malfunction judging part judges that the ozone feed system is malfunctioning when the self-ignition timing is retarded from the presumed self-ignition timing and the combustion noise is larger than the presumed combustion noise or when the self-ignition timing is advanced from the presumed self-ignition timing and the combustion noise is smaller than the presumed combustion noise.

A method for controlling an internal combustion engine having a plurality of cylinders including a first cylinder and one or more remaining cylinders includes selecting a desired auto-ignition dwell for a first combustion cycle for the first cylinder of the plurality of cylinders. A first fuel mass is provided to the first cylinder which is combusted during the first combustion cycle. An actual auto-ignition dwell for the first combustion cycle which results from the first fuel mass is determined and a dwell error is calculated. The dwell error is used to determine a second fuel mass which provided to the first cylinder and which is combusted during the second combustion cycle.

A method of controlling a fuel injector comprises measuring a pressure in a cylinder of an engine with a pressure sensor and determining at least one of a crank angle and a crank speed with a crank sensor. The method also comprises calculating a net indicated mean effective pressure of the cylinder from the measured value of the pressure sensor and the determined value of the crank sensor. Also, the method comprises adjusting a fueling parameter of a fuel injector for the cylinder in response to the difference between the calculated net indicated mean effective pressure and a reference mean effective pressure indicates a change in power of the engine. Alternatively, the method may adjust the fueling parameter based on a power feedback signal for the engine.

The control device that controls fuel injection of a diesel engine includes a split injection control module that causes a fuel injection valve to execute pre-injection and post-injection, a setting module that sets a fuel injection amount or a fuel injection timing in the pre-injection so that a target heat release rate characteristic, by which a ratio between a first peak and a second peak, which are peaks of an increase rate of combustion pressure accompanying the pre- and post-injection, becomes a target value set in advance, can be obtained, a prediction module that predicts an occurrence time or a peak value of the first peak based on the injection amount or injection timing and a parameter related to a combustion environmental factor, and a correction module that corrects the fuel injection amount or the fuel injection timing set by the setting module.

A control system that controls fuel injection of a diesel engine includes a split injection control module that causes a fuel injection valve to execute pre-injection for injecting fuel at a predetermined first timing, and post-injection for injecting fuel at a second timing later than the pre-injection, a setting module that sets a fuel injection amount or a fuel injection timing in the pre-injection or the post-injection so that a difference between a first peak and a second peak, which are peaks of an increase rate of combustion pressure accompanying the pre- and post-injection, falls within a predetermined range, and a calculation module that calculates the first and second peaks in an increase rate of the combustion pressure by excluding motoring pressure, which is an in-cylinder pressure at the time of non-combustion of the combustion chamber.

A combustion control part of a control device for an internal combustion engine configured to calculate a first vibration level of an engine body at a first judgment frequency band of a second overtone of a specific frequency band based on vibration acceleration detected by a vibration sensor and, when the first vibration level is less than a predetermined first reference vibration level set in advance according to the engine operating state, to correct one or both of a target injection amount and target injection timing so that the first vibration level becomes the first reference vibration level or more.

A method and apparatus for in situ operating an internal combustion engine comprising determining at least one combustion characteristic for a combustion chamber of the internal combustion engine, comprising an actual heat release signal for the combustion chamber; and inputting the actual heat release signal into a diagnostic logic tree for diagnosing changes in combustion characteristics due to at least one of: a malfunctioning fuel injector, a start of combustion timing error; and a change in fuel quality; and performing a mitigation technique to compensate for the changes in combustion characteristics.

A torque requesting module generates a torque request for an engine based on driver input. A model predictive control (MPC) module: identifies sets of possible target values based on the torque request, each of the sets of possible target values including target effective throttle area percentage; determines predicted operating parameters for the sets of possible target values, respectively; determines cost values for the sets of possible target values, respectively; selects one of the sets of possible target values based on the cost values; and sets target values based on the possible target values of the selected one of the sets, respectively, the target values including a target pressure ratio across the throttle valve. A target area module determines a target opening area of the throttle valve based on the target effective throttle area percentage ratio. A throttle actuator module controls the throttle valve based on the target opening.

A processor (B705, B706) of a control device for an internal combustion engine 1 operates a first combustion timing (MFB 50) or a first combustion period (IG 100_1) in a cylinder of the internal combustion engine 1 from a crank angle detected by a crank angle sensor 20. A processor (B702) operates a heat generation rate based on a first combustion timing or a first combustion period. A processor (B703) operates in-cylinder pressure and in-cylinder unburned gas temperature based on the heat generation rate. A processor (B704) operates a first combustion speed (laminar flow combustion speed SL1) based on the in-cylinder pressure and the in-cylinder unburned gas temperature. A processor (B707) learns a correspondence relationship between the first combustion speed and the first combustion timing or the first combustion period.

Operating a gaseous fuel engine system includes conveying hydrogen fuel and hydrocarbon fuel into a cylinder in a gaseous fuel engine for combustion. Operating a gaseous fuel engine system further includes receiving an increased engine power output request, boosting a power output of the gaseous fuel engine by varying a ratio of the hydrogen fuel and the hydrocarbon fuel combusted in the cylinder, and varying an in-cylinder combustion parameter based on the varying a ratio. Perturbation to a performance profile of the gaseous fuel engine is thereby limited. Related apparatus and control logic is also disclosed.