A system and method for cylinder deactivation in a multi-cylinder diesel engine comprises pumping air in to an intake manifold of the diesel engine using a turbocharger. Air is pumped in to the intake manifold using an intake air assisting device. And, fuel injection is selectively deactivated to at least one of the cylinders in the diesel engine. An intake valve and an exhaust valve is selectively deactivated for the at least one of the cylinders of the diesel engine.

A control device for a compression self-ignition combustion engine is provided, which includes a variable valve operating system configured to introduce internal exhaust gas recirculation (EGR) gas into a combustion chamber, a boosting system configured to boost intake air, a controller configured to control the valve operating system, and a sensor connected to the controller and configured to detect a parameter related to an operating state of the engine. An operation mode of the valve operating system is switchable between first and second modes. The boosting system boosts the intake air when an engine load is higher than a given load, and does not boost when lower than the given load. When the engine load is high, the controller controls the valve operating system to operate in the first mode, and when the load is low, the controller controls the valve operating system to operate in the second mode.

The purpose of the present invention is to provide a control device for an internal combustion engine with which it is possible to favorably control an engine even if there could occur a difference in temperatures of fuel injected into respective cylinders. The present invention is a control device for an internal combustion engine, for controlling an internal combustion engine provided with fuel injection valves for directly injecting fuel respectively to a plurality of cylinders, wherein: the control device is provided with a fuel temperature acquiring means for acquiring respective temperatures of fuel injected to each of the cylinders; and at least one of a fuel injection valve control amount, ignition control amount, and intake and exhaust valve control amount of each of the cylinders is set in accordance with the respective temperatures of fuel acquired by the fuel temperature acquiring means. Alternatively, the present invention is a control device for an internal combustion engine, for controlling an internal combustion engine provided with fuel injection valves for directly injecting fuel respectively to a plurality of cylinders, wherein the control device is provided with a valve-closing time detecting means for detecting a valve-closing time of a valve body of each of the fuel injection valves, and a fuel temperature estimating means for estimating the temperature of fuel on the basis of the valve-closing duration of the valves detected by the valve-closing time detecting means.

Methods and systems are provided for diagnosing a laser ignition system of an engine. In one example, a controller may operate the laser in a sealed cylinder hours after key-off. Then, the cylinder may be unsealed and a change in exhaust temperature may be correlated with laser functionality.

A control device for a compression-ignition engine is provided, in which partial compression-ignition combustion including spark ignition (SI) combustion performed by combusting a portion of mixture gas inside a cylinder by spark-ignition followed by compression ignition (CI) combustion performed by causing the rest of the mixture gas inside the cylinder to self-ignite is executed within a part of an operating range of the engine. The device includes a detector configured to detect a parameter related to noise caused by the combustion inside the cylinder, an EGR (exhaust gas recirculation) controller configured to change an EGR ratio being a ratio of exhaust gas introduced into the cylinder, and a combustion controller configured to control the EGR controller to increase the EGR ratio when a noise index value specified based on the detected parameter of the detector is confirmed to exceed a given threshold during the partial compression-ignition combustion.

Systems and methods for operating a hybrid powertrain that includes an engine and a motor/generator are described. The systems and methods provide a way of determining whether or not an engine has stalled while a vehicle may be propelled via the motor/generator. In one example, an engine stall may be indicated responsive to a first estimated engine torque and a second estimated engine torque.

This control apparatus for an engine includes an engine, an injector, a spark plug, an intake electric S-VT, an exhaust electric S-VT, and a controller. The controller outputs a control signal to at least one of the intake electric S-VT and the exhaust electric S-VT so as to perform valve control of opening an intake valve when an exhaust valve is open, and then outputs a control signal to the spark plug at predetermined ignition timing such that, after air-fuel mixture is ignited and combustion is started, unburned air-fuel mixture is combusted by autoignition.

A control device for an internal combustion engine that includes an external EGR device having an EGR passage and an EGR valve installed at an end portion of the EGR passage on the side of a cylinder is configured, when a high intake air pressure condition is met and there is no EGR gas introduction request, to execute an EGR cut control using a variable valve operating device. In the EGR cut control, the control device is configured to open an intake valve during the intake stroke after the EGR valve opens, and adjust an overlap area such that an outflow gas amount via the EGR valve becomes equal to an inflow gas amount via the EGR valve. The EGR passage is configured so as to store a gas that flows out to the EGR passage from the cylinder via the EGR valve during of the EGR cut control.

A scavenged gas amount calculation device for an internal combustion engine, which is capable of accurately calculating a scavenged gas amount under conditions where scavenged gases are produced during a valve overlap time period, and an internal EGR amount calculation device for the engine, which is capable of calculating an internal EGR amount using the scavenged gas amount thus calculated. The internal EGR amount calculation device includes an ECU. The ECU calculates a basic blown-back gas amount using an average intake pressure, a maximum exhaust pressure, and a correction coefficient (step 6), calculates a scavenged gas amount using the average intake pressure, a minimum exhaust pressure, and a scavenge ratio (step 8), calculates a blown-back gas amount by correcting the basic blown-back gas amount by the scavenged gas amount (step 11), and calculates the internal EGR amount according to the blown-back gas amount (step 12).

Because an in-cylinder temperature becomes low immediately after cold starting, it is impossible to take large ignition timing retard to avoid combustion instability and it takes time to activate a catalyst existing downstream of an internal combustion engine.

The present invention provides an internal combustion engine control apparatus including an ignition timing control unit to control an ignition timing of an ignition device attached to an internal combustion engine. The internal combustion engine control apparatus includes an in-cylinder temperature raising unit that raises an in-cylinder temperature, the in-cylinder temperature is raised by the in-cylinder temperature raising unit, and a retard amount of the ignition timing of the ignition device is increased by the ignition timing control unit.