The present disclosure relates to assessing the intake air flow of industrial engines. For an industrial engine that receives vent gas added to intake air for combustion, a gas concentration sensor is used to measure a concentration of a particular gas, e.g. methane, in the intake air. An amount of the methane component in the intake air flowing to the engine that was added by the vent gas can be determined from the measured concentration of methane in the intake air and a flow rate of the intake air. The intake air flow rate may be directly measured, or calculated using instrumentation which may already be in place for engine air-to-fuel ratio control.

A method and system is provided for correcting fueling commands. For example, the method and system may calibrate an engine operating in a steady-state mode by determining a plurality of accuracy errors associated with a fueling rate based on a plurality of sensor measurements. The method and system may determine fueling rate correction data during on-line operation of the engine based on the plurality of accuracy errors. The on-line operation of the engine may comprise operating the engine in a transient mode at a first period of time and a steady-state mode at a second period of time. The method and system may control at least one fueling valve during operation of the engine using a corrected fueling command. The corrected fueling command is based on the fueling rate correction data.

Methods and systems are provided for operating a cylinder of an engine including a pre-chamber ignition system. In one example, a method may include determining amounts of pre-chamber gases in the cylinder prior to combustion, and adjusting an amount of fuel injected into the cylinder based on the amounts of pre-chamber gases in the cylinder. In this way, cylinder fueling may be compensated for additional air and/or fuel from the pre-chamber gases, which may increase an accuracy of the cylinder fueling and increase cylinder efficiency.

A method for controlling an engine of a vehicle includes: monitoring, by a controller, engine operation data including a crank position and an engine rotation speed; obtaining, by the controller, a measured air amount flowing into to a specific cylinder; calculating, by the controller, an expected air amount at an intake valve closing time based on the measured air amount; calculating, by the controller, a fuel amount based on the expected air amount; calculating, by the controller, an ignition timing based on the engine rotation speed and the expected air amount; and injecting, by the controller, the calculated fuel amount and performing ignition at the ignition timing.

A port injection valve injects fuel into an intake passage. A controller increases a base injection amount over a predetermined period after the internal combustion engine is started and gradually decreases an increase correction ratio of the base injection amount. One of two processes, a multiple injection process and a single injection process, is selected in order to inject the increased base injection amount of fuel. The increase correction ratio is set to be a smaller value in the multiple injection process than in the single injection process.

Provided is a device for controlling a fuel injection device capable of suppressing deterioration of exhaust performance while ensuring driving performance when acceleration of a vehicle is requested during an intake stroke. Therefore, when the acceleration of a vehicle is requested during an intake stroke in one combustion cycle, an engine control unit 9 estimates an increase (acceleration intake air amount Qad) of the amount of air taken in a combustion chamber 19 of an internal combustion engine 1 associated with the acceleration of the vehicle after the acceleration of the vehicle is requested in one combustion cycle based on a lift amount of an intake valve 3. The engine control unit 9 controls a fuel injection valve 5 so as to increase a fuel injection amount in one combustion cycle according to the acceleration intake air amount Qad.

Provided are an internal combustion engine control device and control method in which a multi-injection process comprises performing an intake synchronized injection and an intake asynchronous injection to inject a required injection amount of fuel by operating a port injection valve for injecting fuel into an intake passageway. A variable process includes variably setting an injection timing for the intake synchronized injection on the basis of at least two of three parameters. The injection timing for the intake synchronized injection is expressed by the rotation angle of a crank shaft of an internal combustion engine. The three parameters include a rotational speed of the crank shaft of the internal combustion engine, a valve-opening start timing of an intake valve, and a temperature of an intake system of the internal combustion engine.

An object of the present invention is to predict change of a combustion limit due to cycle variation of temperature and an EGR ratio and perform correction every cycle to decrease an amount of combustion consumption. Therefore, in an internal combustion engine control device that controls an internal combustion engine including a cylinder and an exhaust pipe, the internal combustion engine control device includes a control unit configured to perform EGR control of controlling an exhaust gas in the exhaust pipe to return to an inner cylinder of the cylinder, obtain temperature of the gas in the internal cylinder and an EGR ratio in a state where both an intake valve and an exhaust valve are closed in an combustion cycle, and correct a combustion parameter in a same combustion cycle as the combustion cycle on the basis of the obtained gas temperature and the obtained EGR ratio.

A method of controlling an internal combustion engine with a plurality of cylinders includes injecting a first gaseous fuel, at a first pressure, into at least a first cylinder of the cylinders, in a first combustion mode, and simultaneously providing a second gaseous fuel, at a second pressure which is different than the first pressure, for at least a second cylinder of the cylinders, in a second combustion mode which is dissimilar to the first combustion mode, wherein the second cylinder is not the first cylinder.

A control apparatus (12): creates a torque correction table indicating a relationship between a change rate of an intake air amount, a change of the main injection amount and the main injection timing of a fuel injection apparatus (8) in the torque value of a diesel engine (1) in a lean state; measures an intake air amount in a rich state by using an MAF sensor (11); calculates a change rate of the measured intake air amount for the intake air amount in the lean state; obtains a correction value of the main injection amount and a correction value of the main injection timing of the fuel injection apparatus (8) based on the calculated change rate and the torque correction table; and performs an injection of the fuel in the rich state at the main injection amount and the main injection timing, corrected by the respective correction values.