An engine system is provided, which includes a cylinder block, a cylinder head, a piston, a main combustion chamber, a subchamber, an injector that injects fuel into the main combustion chamber, a main spark plug that ignites a mixture gas inside the main combustion chamber, a subspark plug that ignites the mixture gas inside the subchamber, and a control device. In a low-speed high-load range, a fuel injection timing is set in compression stroke and the main ignition and the subignition are performed after the fuel injection timing, and the fuel injection timing under a low-speed condition becomes later than that under a high-speed condition, and the ignition devices are controlled so that the subignition timing is retarded from the main ignition timing and an ignition phase difference that is the retard amount of the subignition timing becomes larger under the low-speed condition than under the high-speed condition.

An engine system is provided, which includes a main combustion chamber, a subchamber, an injector that injects fuel into the main combustion chamber, a main spark plug that ignites a mixture gas inside the main combustion chamber, a subspark plug that ignites the mixture gas inside the subchamber, an exhaust gas recirculation (EGR) device and a control device. In a specific range where EGR is performed, the ignition devices are controlled so that a subignition timing is retarded from a main ignition timing, and an ignition phase difference that is a retard amount of the subignition timing from the main ignition timing becomes larger under a high EGR condition than a low EGR condition, the EGR conditions being conditions in the specific range where engine speeds are the same and EGR rates are different, and the high EGR condition being larger in the EGR rate than the low EGR condition.

A control device of a hybrid vehicle including an engine, motor that receives power from the engine via an engine connecting and disconnecting device, and automatic transmission, starts the engine in a first starting method in which the engine performs ignition and rotates by itself after the engine speed is increased to be equal to or higher than a predetermined rotational speed through slipping engagement of the engine connecting and disconnecting device, or a second starting method in which the engine performs ignition and rotates by itself from a stage before the engine speed reaches the predetermined rotational speed, and controls the automatic transmission to permit a lower gear position to be established according to shift conditions when the engine is started in the second starting method during a downshift of the automatic transmission, as compared with when the engine is started in the first starting method during the downshift.

Multiple rotational irregularities in an internal combustion engine are determined. An uneven running value of a currently-ignited combustion chamber in a logical ignition sequence of a plurality of combustion chambers immediately after a logically-preceding ignited combustion chamber is determined. The uneven running value determined for the logically-preceding ignited combustion chamber exceeds a specified threshold value and indicates a fault in the logically-preceding ignited combustion chamber. A compensation factor is determined that. A compensated uneven running value of the currently-ignited combustion chamber from the uneven running value of the currently-ignited combustion chamber and the compensation factor is determined. The compensated uneven running value of the currently-ignited combustion chamber is compared with the specified threshold value to determine whether the currently-ignited combustion chamber has a fault.

The solution of the invention is an internal combustion engine with oxygen concentrating equipment (80) wherein the air compressed in the compression stroke is not yet used for combustion but taken out of the cylinder space (15) and used for operating the oxygen concentrating equipment (80). The essence of the invention is that the cylinder space (15) and one or more cells of the oxygen concentrating equipment (80) are temporarily connected during each compression stroke of the engine. The air taken in the cylinder space (15) during the intake stroke and pushed out by the piston (5) during the compression stroke charges one or more cells (41 A-41Z, 51 A-51Z) of the oxygen concentrating equipment (80) and after separating most of the nitrogen in the cells (41 A-41Z, 51A-51Z), the oxygen rich air is injected into the cylinder space (15) through a compressor (33) at the beginning of the expansion stroke by an injector (11). The fuel is also introduced into the cylinder space (15) at the beginning of the expansion stroke by an injector. The ignition may be spark ignition, self-ignition (heat ignition) or their load dependent, speed dependent or power requirement dependent dynamic combination. The invention further relates to the method, the computer program product and the computer-readable medium operating the internal combustion engine with oxygen concentrating equipment.

Methods and systems are provided for re-combustion of exhaust in a cylinder of a multi-cylinder engine in order to increase the temperature of the exhaust for enhancing catalytic conversion within the multi-cylinder engine. In one example, a method may include expelling combusted gases from the cylinder into an intake manifold via an intake valve during an exhaust stroke, in order to rebreathe in the combusted gases from the intake manifold via the intake valve in a subsequent intake stroke.

An embodiment device includes an auxiliary brake including a retarder selectively operated to consume an output of a transmission to generate a braking force and an engine brake selectively operated to increase a flow resistance of an exhaust gas discharged from an engine to generate a braking force, a gas flow volume controller configured to open or close flow paths of an engine intake line and an engine exhaust line, and a controller configured to compare a first braking force difference with a predetermined reference braking force when the auxiliary brake is operated during coasting traveling and to determine and control an opening rate of the gas flow volume controller based on the first braking force difference and an engine speed when the first braking force difference is less than the reference braking force.

A vehicle control system determines that a vehicle is not fully loaded with a payload, determines an upper limit on engine propulsion power for the vehicle that is not fully loaded with the payload, and reduces an engine speed of the vehicle to a determined speed at which a power capability of an engine of the vehicle matches the upper limit on the engine propulsion power of the vehicle.

An electric drive system for a vehicle and a method includes determining a headroom target for a drive system of a vehicle that includes an engine. The method includes determining whether a current speed of the engine can be decreased while the engine continues to provide a requested traction output of the drive system, and responsive to determining that the current speed of the engine can be decreased, decreasing the current speed of the engine to a reduced speed while the engine maintains the headroom target determined by the drive system.

A controller may obtain data associated with operation of an engine of a machine that comprises a first engine bank associated with a first set of turbochargers and a second engine bank associated with a second set of turbochargers, and may determine, based on the data, that the engine is in an operating state that requires the first and second sets of turbochargers to be operative. The controller may determine, based on the data, a difference in operation of the first engine bank and the second engine bank and identify, based on the data, a turbocharger failure condition associated with a particular set of turbochargers, of the first and second sets of turbochargers. The controller may identify, based on the data, a particular turbocharger, of the particular set of turbochargers, as a failed turbocharger, and may perform one or more actions based on identifying the particular turbocharger.