To provide a controller and a control method for an internal combustion engine capable of calculating a target value of controlled variable of internal combustion engine which realizes the target torque, while reducing the number of calculations using a torque characteristics function. A controller and a control method for an internal combustion engine calculates ignition sample numbers of ignition corresponding torques corresponding to the respective ignition sample numbers of ignition timings, by using a torque characteristics function relationship in which a relationship between driving condition and output torque is preliminarily set; and calculates an ignition torque approximated curve approximating a relationship between the ignition sample numbers of the ignition timings and the ignition sample numbers of the ignition corresponding torques; and calculates a target ignition timing corresponding to the target torque.

The internal combustion engine includes: a plurality of cylinders each including a piston that reciprocally operates in association with rotation of a crankshaft, and an intake valve and an exhaust valve that open and close a combustion chamber; a starter motor that drives and rotates the crankshaft; and a valve opening-closing timing control mechanism that sets opening and closing timings of the exhaust valve by driving an electric actuator. If an environmental temperature detected by an environmental temperature sensor is less than 10 degrees below freezing, the control device controls the electric actuator such that the closing timing of the exhaust valve is made different from a top dead center of the piston, at a point in time when cranking is performed, and an initial combustion in one of the plurality of cylinders that is set to be the cylinder in which combustion is performed first is performed.

A control system for internal combustion engines having four valves per cylinder. An inlet valve and an exhaust valve are controlled by a basic camshaft. Another inlet valve and another exhaust valve are controlled by a control camshaft. The two camshafts are connected to a crankshaft and engine torque is managed by an electronic control unit. The system comprises a motor/generator unit, connected to the control camshaft; a differential, connected to the crankshaft and to the control camshaft; a control shaft, connected to the differential; an actuator, connected to the control shaft; a one-way restrictor valve connected to a shut-off valve and to the actuator; an oil circuit, connected to the actuator by means of the shut-off valve and a control solenoid that acts on the shut-off valve.

A method for operating an internal combustion engine having a camshaft phase adjuster, including: providing a nonlinear final control element model, which indicates via a functional relationship an angular velocity of a relative adjustment of the camshaft phase adjuster as a function of an actuator correcting variable for the control of the camshaft phase adjuster; carrying out a control based on a deviation between a predefined camshaft angle adjustment setpoint value, and a camshaft angle adjustment actual value, to obtain as a control output a setpoint positioning rate of the camshaft phase adjuster; calculating the actuator correcting variable as a function of the setpoint positioning rate using an inverted final control element model; applying a predefined correction variable to the actuator correcting variable; controlling the camshaft phase adjuster using the actuator correcting variable to which the correction variable has been applied, to operate the internal combustion engine.

A system of controlling an engine provided with a dual continuously variable valve duration device may include an engine, an intake valve for selectively supplying air or a mixture of the air and fuel to the combustion chamber, an ignition switch to ignite a burner to burn the mixture, and an exhaust valve disposed in the combustion chamber to selectively discharge exhaust gas in the combustion chamber to an outside of the combustion chamber, the dual continuously variable valve duration device provided to adjust an intake duration of the intake valve and an exhaust duration of the exhaust valve, a warm-up catalytic converter including a three-way catalyst for purifying hydrocarbons, carbon monoxide, nitrogen oxides contained in the exhaust gas downstream of the engine, and a controller for adjusting an ignition timing, the intake duration and the exhaust duration of the ignition switch based on a driving condition of a vehicle.

An internal combustion engine system includes a fuel injection valve, a variable valve operating device and a control device. The control device is configured, where depression of an accelerator pedal is released, to: execute a fuel cut processing to control the fuel injection valve so as to stop fuel injection; and execute an engine braking enhancement processing to control the variable valve operating device so as to advance the opening and closing timings of the exhaust valve compared to during execution of the fuel injection. The engine braking enhancement processing includes a noise reduction processing to adjust at least one of the closing timing of the exhaust valve and the opening timing of the intake valve such that a second compression work associated with compression of in-cylinder gas in an exhaust stroke becomes smaller than a first compression work associated with compression of in-cylinder gas in a compression stroke.

A four-stroke internal combustion engine is disclosed comprising an exhaust valve control arrangement with an exhaust valve phase-shifting device configured to phase-shift control of the at least one exhaust valve to a state where the at least one exhaust valve is controlled in such a way that it is opened during the expansion stroke of the engine and closed during the exhaust stroke of the engine, in order to achieve engine-braking via compression in the cylinders during the exhaust stroke. An inlet valve control arrangement comprises an inlet valve phase-shifting device configured to regulate the amount of air pumped through the engine during the engine braking by regulating the phase-shift of the at least one inlet valve. The present disclosure also relates to a vehicle comprising an engine and method of controlling an engine, a computer program and a computer program for performing a method of controlling an engine.

In a control device and a control method for an internal combustion engine according to the present invention, when a crank angle signal is behaving abnormally, a phase angle of an exhaust camshaft relative to a crankshaft is set to a reference phase angle, and a phase angle of an intake camshaft relative to the crankshaft is determined based on an intake cam signal and an exhaust cam signal. Furthermore, the phase difference between the exhaust cam signal generated when the relative phase angle of the exhaust camshaft is set to the reference phase angle and the intake cam signal generated when the relative phase angle of the intake camshaft is set to a target value is greater after a start-up of the internal combustion engine than during the start-up.

A spark-ignited gas engine system comprises a combustion chamber defined by a piston, a head with a spark plug mechanism, and a cylinder having an associated intake valve and an associated exhaust valve, into which a mixture of combustible gas and air is entered via an intake manifold of the engine to drive a crankshaft. The system further comprises at least one turbocharger to compress the mixture. The system further comprises at least one camshaft, driven by the crankshaft via a gear assembly connected to the crankshaft, that comprises at least one cam that actuates the intake valve and the exhaust valve, at least one camphaser, coupled to the crankshaft via the gear assembly, and a controller to adjust a cam angle operation of the intake valve and the exhaust valve by adjusting the camphaser to a desired phase position to meet a target rotational phase of the camshaft.

Disclosed is a method for determining the state of rotation of a camshaft of a vehicle engine, notable in that the method for determining the state of rotation of the camshaft determines that the state of rotation of the camshaft is in the process of stalling, corresponding to an intermediate state of rotation, when the time elapsed since the last detection of a camshaft wheel tooth-front by the sensor exceeds Tcam_cal, Tcam_cal being defined as the theoretical length of time needed for the camshaft wheel to cover an angular distance equal to the maximum angular distance separating two successive camshaft wheel tooth-fronts at a camshaft rotational speed corresponding to a predetermined low engine speed higher than the minimum engine speed tolerated by the engine.