The control apparatus operates an engine water temperature adjustment apparatus so that the temperature of cooling water that passes through an engine head enters a first temperature region in a lean mode, and operates the engine water temperature adjustment apparatus so that the temperature of the cooling water enters a second temperature region that is lower than the first temperature region in a stoichiometric mode. When knocking is detected after switching is started from the stoichiometric mode to the lean mode, the control apparatus performs any one of a first operation to operate a variable valve apparatus so as to retard the closing timing of an intake valve, a second operation to operate an oil jet apparatus so as to increase an oil jet amount, and a third operation to operate an EGR apparatus so as to increase an EGR amount.

Methods and systems are provided for injecting and combusting an amount of gaseous fuel during an exhaust stroke of a cylinder combustion event in order to reduce turbo lag and reduce a duration of time required for an exhaust catalyst to light-off during transient events. In one example, when an increase in torque demand is greater than a threshold, a first amount of gaseous fuel may be combusted during a compression stroke of a cylinder combustion event and a second amount of gaseous fuel may be combusted during an exhaust stroke of the combustion event. The second amount may be adjusted based on the increase in torque demand.

A control apparatus for an internal combustion engine includes circuitry configured to control a fuel injector of the internal combustion engine to stop injecting fuel to reduce torque generated by the internal combustion engine during upshift. The circuitry is to acquire a target injection amount parameter corresponding to a target injection amount of the fuel to be injected by the fuel injector to operate the internal combustion engine based on an operation state parameter corresponding to an operation state of the internal combustion engine. The circuitry is to acquire a minimum injectable amount parameter corresponding to a minimum injectable amount of the fuel injectable from the fuel injector. The circuitry is to control the fuel injector to start injecting the fuel when the minimum injectable amount parameter exceeds the target injection amount parameter while the fuel injector is controlled to stop injecting the fuel during the upshift.

A system, method, and engine control module for energy ignition management of a combustion engine. The method may be performed by the system or the engine control module. The method includes determining operating conditions of the combustion engine, setting ignition energy characteristics for a dedicated EGR cylinder and a non-dedicated EGR cylinder based on the operating conditions. The ignition energy characteristics include at least one of magnitude of energy, current, voltage, and ignition energy duration. At least one characteristic of the ignition energy characteristics for the non-dedicated EGR cylinder is different than a corresponding characteristic for the dedicated EGR cylinder. The method also includes energizing ignition aid plugs based on the ignition energy characteristics.

Systems and methods for operating an engine with deactivating and non-deactivating valves are presented. In one example, estimates of engine fuel consumption for operating the engine with a plurality of cylinder modes or patterns while a transmission is engaged in different gears are determined and are used as a basis for deactivating engine cylinders.

As a control method for internal combustion engine, a part of a low-medium revolution speed/low-medium load region of an internal combustion engine is set as a lean combustion region, homogeneous combustion is performed in an operating region within the lean combustion region where a load is relatively low, by injecting fuel at least once between an intake stroke and the first half of a compression stroke to form a homogeneous air-fuel mixture in a combustion chamber, and stratified combustion is performed in an operating region within the lean combustion region where the load is relatively high, by injecting the fuel at least once, respectively, between the intake stroke and the first half of the compression stroke as well as in the second half of the compression stroke to form a stratified air-fuel mixture in the combustion chamber. In this control method, ignition energy supplied to an ignition plug when the stratified combustion is performed is controlled to be smaller than ignition energy supplied to the ignition plug when the homogeneous combustion is performed.

As a control method for internal combustion engine, a part of a low-medium revolution speed/low-medium load region of an internal combustion engine is set as a lean combustion region, homogeneous combustion is performed in an operating region within the lean combustion region where a load is relatively low, by injecting fuel at least once between an intake stroke and the first half of a compression stroke to form a homogeneous air-fuel mixture in a combustion chamber, and stratified combustion is performed in an operating region within the lean combustion region where the load is relatively high, by injecting the fuel at least once, respectively, between the intake stroke and the first half of the compression stroke as well as in the second half of the compression stroke to form a stratified air-fuel mixture in the combustion chamber. In this control method, ignition energy supplied to an ignition plug when the stratified combustion is performed is controlled to be smaller than ignition energy supplied to the ignition plug when the homogeneous combustion is performed.

A crankshaft system is provided. The crankshaft has a main journal, a rod journal rotates around the main journal, a planet gear is attached to the rod journal and can rotate around the rod journal, the rotation of the planet gear is constrained by a constraining gear, the teeth number of the constraining gear is integer k times of the teeth number of the planet gear, a crankpin is mounted on the planet gear, one end of a connecting rod of a piston is attached to the crankpin, the constraining gear is a ring gear or a sun gear, the trajectory of the crankpin is noncircular. The combustion chamber volume keeps constant from 0° ATDC to 14° ATDC, or the minimum combustion chamber volume extends from TDC to 14° ATDC or after 14° ATDC.

A crankshaft system is provided. The crankshaft has a main journal, a rod journal rotates around the main journal, a planet gear is attached to the rod journal and can rotate around the rod journal, the rotation of the planet gear is constrained by a constraining gear, the teeth number of the constraining gear is integer k times of the teeth number of the planet gear, a crankpin is mounted on the planet gear, one end of a connecting rod of a piston is attached to the crankpin, the constraining gear is a ring gear or a sun gear, the trajectory of the crankpin is noncircular. The combustion chamber volume keeps constant from 0° ATDC to 14° ATDC, or the minimum combustion chamber volume extends from TDC to 14° ATDC or after 14° ATDC.

Methods and systems are provided for operating a variable displacement engine that includes a knock control system. Engine background noise levels for detecting engine knock may be the basis for determining whether or not the engine is operating in a cylinder deactivation mode. Further, select variable engine displacement modes may be avoided so that engine background noise level changes may be reduced to improve engine knock detection.