A method of operating an internal combustion engine with at least one piston-cylinder unit, and preferably a plurality of the piston-cylinder units, whereby, in a detection mode of the internal combustion engine one or more knock-promoting measures are taken until knocking has occurred in at least one piston-cylinder unit, and the measure(s) is/are intensified until a termination criterion is reached, whereby it is detected in which of the piston-cylinder units knocking has occurred, and whereby, in piston-cylinder units detected as knocking, the ignition time for a normal operating mode of the internal combustion engine is retarded.

A method for controlling a marine engine for propelling a marine vessel includes receiving user input as a user input device to control acceleration of a marine vessel, detecting a rapid acceleration command based on the user input, and determining an advanced spark timing based on at least one of engine speed and engine load, wherein the advanced spark timing adjusts a base spark time by a spark advance offset. A fuel increase is then determined based on the spark advance offset, and then an increased fuel injection amount is determined by increasing a base fuel injection amount by the fuel increase. Spark and fuel delivery are then controlled for one or more cylinders of the marine engine based on the advanced spark timing and the increased fuel injection amount.

A method of preventing a catalyst from being damaged through igniting timing correction may include confirming a number of engine revolutions, determining whether a misfire occurs; confirming a driving condition of a vehicle when the misfire occurs, determining an ignition timing correction efficiency based on the vehicle driving condition, and determining a misfire rate by determining and confirming a misfire effect of a cylinder based on the determined ignition timing correction efficiency

In an embodiment, a combustion control device for an engine includes: a knocking determination unit to determine occurrence of knocking of each of the cylinders; a knocking reduction unit to halt or reduce supply of gas to a cylinder in which the knocking is occurring and reduce supply of the gas to other cylinders in which the knocking is not occurring; a first recovery unit configured to recover a state where the gas is at least reduced in the cylinder in which the knocking is occurring; and a second recovery unit configured to recover a state where the gas is reduced in other cylinders within which knocking is not occurring. In embodiments, a recovery time of the first recovery unit is shorter than a recovery time of the second recovery unit, and prioritizing recovery of the cylinder in which the knocking is occurring.

In an embodiment, a combustion control device for an engine includes: a knocking determination unit to determine occurrence of knocking of each of the cylinders; a knocking reduction unit to halt or reduce supply of gas to a cylinder in which the knocking is occurring and reduce supply of the gas to other cylinders in which the knocking is not occurring; a first recovery unit configured to recover a state where the gas is at least reduced in the cylinder in which the knocking is occurring; and a second recovery unit configured to recover a state where the gas is reduced in other cylinders within which knocking is not occurring. In embodiments, a recovery time of the first recovery unit is shorter than a recovery time of the second recovery unit, and prioritizing recovery of the cylinder in which the knocking is occurring.

A method for knock control of an internal combustion engine capable of being operated using a water injection system, in which at least one parameter of the knock control is determined as a function of a variable connected to the water injection system, in particular the water content.

The present disclosure relates to an engine provided with cylinder deactivation (CDA) apparatuses for at least some engine cylinders and provided with a water pump, and a method for controlling the same. The method for controlling the engine includes a controller: determining, based on output signals from vehicle driving information sensors, whether or not a current vehicle driving state corresponds to a CDA driving region; operating CDA apparatuses of some of the cylinders when the current vehicle driving state corresponds to the CDA driving region; determining whether or not detonation border lines (DBLs) of respective cylinders the CDA apparatuses of which are not operated precede a minimum spark advance for best torque (MBT); and, when the DBLs precede the MBT, operating corresponding water injecting nozzles so as to inject water into the respective cylinders.

To provide an internal combustion engine control device (100) in which a control unit (107b) controls an operating condition of an internal combustion engine (1) based on a difference TCC between a first temperature TCC corresponding to the temperature of a first portion in a wall defining a combustion chamber of the internal combustion engine (1), and a second temperature TE corresponding to the temperature of a second portion on an outer wall surface side than the first portion in the wall.

A control device for an internal combustion engine includes an in-cylinder pressure sensor, a crank angle sensor, and an electronic control unit. The electronic control unit is configured to calculate a correlation index value showing a degree of a correlation between a actually measured data of a combustion mass ratio and reference data of the combustion mass ratio based on an operating condition of the internal combustion engine. The electronic control unit is configured to, in a case where the correlation index value is lower than a determination value, prohibit the actually measured value of the specific ratio combustion point pertaining to a combustion cycle in which the correlation index value is calculated from being reflected in the engine control or reduce a degree of the reflection in the engine control compared to a case where the correlation index value is equal to or higher than the determination value.

The invention relates to a method for operating an internal combustion engine, in which the internal combustion engine has at least one first combustion chamber, in which combustion processes take place during fired operation of the first combustion chamber, at least one second combustion chamber, in which combustion processes take place during a fired operation of the second combustion chamber, a first knock sensor assigned to the first combustion chamber, by means of which irregular combustions in the first combustion chamber can be detected, and a second knock sensor assigned to the second combustion chamber, by means of which irregular combustions in the second combustion chamber can be detected. The internal combustion engine is operated in a first operating state in which channel switching is carried out. A switch is made from the first operating state to a second operating state in which channel switching does not take place.