A method of selecting a compression ratio in an internal combustion engine having a mechanism configured to vary the compression ratio includes receiving, via an electronic controller, a requested output torque value. The method also includes determining, via the controller, a value of engine speed corresponding to the requested output torque value. The method additionally includes determining, via the controller, a compression ratio value corresponding to the requested output torque value and the determined value of the engine speed. The method also includes determining, via the controller, a position of the mechanism corresponding to the determined compression ratio value. Furthermore, the method includes commanding, via the controller, the determined position of the mechanism and thereby selecting the determined compression ratio value. A vehicle employing a variable compression ratio internal combustion engine and an electronic controller configured to operate the engine according to the method is also disclosed.

A control device for an engine is provided, which includes a combustion chamber formed by a cylinder and a piston, an intake air amount adjuster that adjusts an intake air amount supplied to the combustion chamber, a controller switchable of a combustion mode between a fuel-lean first combustion mode and a stoichiometric second combustion mode based on an engine operating state, and an intake air cooler that cools the intake air supplied to the combustion chamber. The controller controls the intake air cooler to start intake air cooling in response to a request for switching the combustion modes, and after the intake air cooling is started, controls the intake air amount adjuster to start the switching of the combustion modes, and then controls the intake air cooler and the intake air amount adjuster so that the switching of the combustion modes ends after the intake air cooling is finished.

A method for operating an internal combustion engine having a cylinder, an intake valve, an air pipe, and a valve element disposed in the air pipe, includes detecting a signal for causing a fuel supply of the cylinder to switch off. The valve element is moved out of a first position into a second position triggering a lower flow cross-section while the fuel supply is still activated, where a first cam for actuating the intake valve is allocated to the intake valve. While the fuel supply is still activated, switching from the first cam to a second cam and via the second cam the intake valve is actuated such that the intake valve causes a reduced air intake. An exhaust cam shaft for actuating an exhaust valve is set in an advance direction such that a valve intersection of the intake valve and of the exhaust valve ceases.

The present invention provides a method for avoiding knocking in an internal combustions engine, preferably in a gasoline engine with a high compression ratio and a variable valve train which is able to perform EIVC, by injecting a non-combustible fluid into the intake port and/or in the cylinder during a transient operating mode.

An internal combustion engine includes an internal combustion engine body including an intake valve and an exhaust valve, and a controller configured or programmed to perform a control to set a rotational speed of the internal combustion engine body to a predetermined rotational speed based on an environmental temperature at a time of starting the internal combustion engine body, and perform a control to drive the internal combustion engine body at the set predetermined rotational speed during a time period until when fuel is supplied to a combustion chamber of the internal combustion engine body and first ignition is performed.

A method for controlling and/or regulating the operation of an internal combustion engine, wherein the relevant specific relative locations of the intake camshaft with respect to the crankshaft are defined and/or controlled with the aid of regulating control values of the engine control unit, in particular for controlling the intake valves between the control value 1 for late and the control value 0 for early, and wherein a specific regulating control value curve and/or specific regulating control values for controlling the relative position of the intake camshaft is or are stored, at least for a specific control period for implementing the load jump, namely at least between the time of the start of the target load jump to the time of the end of the actual load jump corresponding to the target load jump.

An internal-combustion engine includes a variable compression ratio mechanism for changing a mechanical compression ratio, and a variable valve timing mechanism for changing the valve timing of an intake valve. When acceleration is demanded, a target compression ratio is set to a lower compression ratio than the target value in a normal condition, and the valve timing is set to the advance angle side. Since the allowable combustion pressure decreases in a prescribed intermediate compression ratio region, if an actual compression ratio exists in the prescribed intermediate compression ratio region in the course of a compression ratio change accompanying acceleration, the variable compression ratio mechanism restricts the intake pressure by increasing a degree of opening of a wastegate valve or reducing a degree of opening of a throttle valve, for example.

Systems, apparatus, and methods are disclosed that include an internal combustion engine having a plurality of cylinders and controlling a variable geometry turbocharger during early intake valve opening to reduce or prevent oil consumption.

An air supply device for an electrically heated catalyst is proposed. The device includes an electronic supercharger fluidly connected to an intake manifold, an intake valve fluidly connected to the electronic supercharger, an exhaust valve fluidly connected to an exhaust manifold of the engine, an electrically heated catalyst fluidly connected to the exhaust manifold and positioned in a front end of a catalyst part, and a controller configured to control driving of the electronic supercharger and an opening degree of each of the intake valve and the exhaust valve. The controller controls the electronic supercharger based on a door opening condition in a cold operation and switches the intake valve to an advance state and the exhaust valve to a retard state, thus heating the electrically heated catalyst.

Methods and systems are provided for adjusting vehicle noises to notify the vehicle operator of speed changes in human-in-the-loop cruise control and semi-autonomous vehicle operation. In one example, a method for drive unit of a vehicle may include responsive to a vehicle speed meeting a predefined condition relative to a threshold vehicle speed, adjusting one or more drive unit actuators to modulate engine noise while maintaining desired wheel torque within a threshold.