A method of controlling a high pressure gas injection internal combustion engine includes injecting, in a first combustion mode, by a first as injection system, a first gaseous fuel into a cylinder of the engine, and accumulating in a container of a second gas injection system excess gaseous fuel from the first fuel system, shifting, in the cylinder, from the first combustion mode to a second combustion mode including determining a value of an air flow related parameter indicative of an air mass flow into the cylinder, determining, based on the determined air flow related parameter value, a value of a fuel flow related parameter indicative of a mass flow of the excess gaseous fuel, and supplying from the container, in accordance with the determined fuel flow related parameter value, the excess gaseous fuel to provide a premix of air and the excess gaseous fuel to the cylinder.

A mass air flow measurement apparatus for an internal combustion engine includes: a plurality of pressure sensors disposed at different locations along an air intake path of the internal combustion engine, each pressure sensor adapted to sense a pressure of air flowing into the internal combustion engine and output an electrical signal as a pressure signal corresponding to the sensed air pressure; a carburetor having a plurality of booster venturis, the carburetor rendered permanently inoperable to mix fuel with air flowing in the air intake path, a body of the carburetor configured to accept one or more of the plurality of pressure sensors for each of the plurality of booster venturis; and a calculation section that receives the pressure signals and generates a mass air flow signal as an output signal to an engine management system to control an electronic fuel injection system based on the received pressure signals.

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.

An apparatus for controlling fuel injection according to an exemplary embodiment of the present disclosure may include a driving information detector for detecting driving information including a fresh air amount flowing into an intake manifold through a throttle valve, a recirculation gas amount supplied to the intake manifold through an exhaust gas recirculation apparatus, a fuel vapor amount supplied to the intake manifold through a canister purge system, a gas amount supplied to a cylinder from the intake manifold, an internal pressure of the intake manifold, an internal temperature of the intake manifold, a pressure of a recirculation gas and a temperature of the recirculation gas; an injector for injecting fuel into the cylinder; and a controller for calculating gas amount supplied to the cylinder at a next intake stroke from the driving information and controlling fuel amount injected by the injector at the next intake stroke to be a target air-fuel ratio.

Disclosed is a procedure to minimize NOx during varying engine loads in a 4-stroke diesel engine including at least one cylinder with a cylinder head, first piston on a connecting rod, one actuator mounted on the cylinder head and one of the actuator operated second piston lockable via a hydraulic circuit in various positions in a combustion chamber. The second piston, at the latest during the current compression stroke is actuated by the actuator and locked in the combustion chamber, where it by the first piston introduced air is compressed in a predetermined compression ratio to meet an existing engine load wherein the free operated inlet valve is brought to close the inlet stroke at a piston position where the volume of the combustion air as introduced at the end of the compression stroke gives the predetermined compression ratio and that the injector injects the stated amount of fuel.

Provided are a control device for an internal combustion engine, wherein the internal combustion engine is provided with a crank mechanism for converting a reciprocating motion of a piston into a rotating motion of a crankshaft, a cylinder accommodating the piston, and an intake valve capable of opening and closing an inlet for sucking gas into the cylinder, and the control device is provided with: a volumetric efficiency calculating unit for calculating a volumetric efficiency representing a suction efficiency when gas is sucked into the cylinder, on the basis of a cylinder capacity when the intake valve is closed; a gas suction amount calculating unit for calculating a gas suction amount sucked into the cylinder, by means of a predetermined formula, on the basis of the calculated volumetric efficiency; and a control unit for controlling the internal combustion engine on the basis of the calculated gas suction amount.

When an intake air amount is greater than or equal to the lower limit intake air amount and less than or equal to the upper limit intake air amount, a CPU sets, from the first cylinder group that increases a detection value of an upstream air-fuel ratio sensor, one of cylinders that has the smallest cutoff frequency, which is stored in a storage device, as a cylinder to which the supply of fuel will be cut off. Then, the CPU obtains the maximum value of an upstream air-fuel ratio as a maximum air-fuel ratio. When the maximum air-fuel ratio is greater than a determination value, the CPU determines that specific cylinder fuel cutoff control is normal. When the maximum air-fuel ratio is less than or equal to the determination value, the CPU determines that the specific cylinder fuel cutoff control is anomalous.

Provided is an engine control device for correcting output characteristics of an oxygen sensor and performing air-fuel ratio feedback control. The engine control device includes various sensors for detecting operating state information of an engine, an oxygen sensor, and air-fuel ratio feedback controller to adjust an amount of fuel injected into the engine, on the basis of the operating state information and an output voltage value of the oxygen sensor, wherein the air-fuel ratio feedback controller calculates, in accordance with the operating state information based on detection results from the various sensors, a coefficient for correcting the output voltage value, implements air-fuel ratio feedback control on the basis of an air-fuel ratio feedback control correction amount calculated using a corrected oxygen sensor output voltage value calculated on the basis of the coefficient, and adjusts the amount of fuel injected into the engine.

A control device for an internal combustion engine includes a throttle valve actuator and circuitry. The circuitry is configured to calculate, based on a target intake air amount, a target recirculated amount of recirculated exhaust gas that is recirculated to an intake passage through an exhaust gas recirculation device, calculate a corrected target recirculated amount based on the target recirculated amount and an exhaust gas recirculated amount change delay in a change in a recirculated amount of the recirculated exhaust gas, calculate a target intake pressure based on the target intake air amount and the corrected target recirculated amount, calculate a target opening degree of the throttle valve based on the target intake air amount and the target intake pressure, and control the throttle valve actuator to drive the throttle valve such that an opening degree of the throttle valve is to be equal to the target opening degree.

In order to provide a flow measuring device high in thermal responsiveness, the flow measuring device includes a temperature detecting element 2 for temperature detection, and a conductive metal lead frame 3 that supports and fixes the temperature detecting element. Of the metal lead frame, a part of the metal lead frame mounted with the temperature detecting element has a portion which is thinner than the thickness of the other metal lead frame or narrower than the width of the other metal lead frame.