Methods and systems are provided for mitigating engine pre-ignition based on a feed-forward likelihood of pre-ignition and feedback from a pre-ignition event. In response to an indication of pre-ignition, a cylinder may be enriched while an engine load is limited. The enrichment may be followed by an enleanment to restore exhaust catalyst feed-gas oxygen levels. The mitigating steps may be adjusted based on engine operating conditions, a pre-ignition count, as well as the nature of the pre-ignition.

Method and system for pre-ignition control

A spark-ignition direct injection engine is provided. The engine includes an engine body having a cylinder, intake and exhaust valves for opening and closing intake and exhaust ports that open to the cylinder, respectively, a fuel injection valve for injecting fuel into the cylinder, a catalyst in an exhaust passage, and a controller for operating the engine body by controlling the intake and exhaust valves and the fuel injection valve. The controller performs a fuel cut by suspending the fuel injection during engine deceleration in a non-operated accelerator state, and when the engine speed drops to a predetermined speed, the controller resumes the fuel injection. During the fuel cut, the controller opens the exhaust valve on an intake stroke and then opens the intake valve, and after closing the exhaust valve and when mixture gas is blown back to the intake port, the controller closes the intake valve.

Spark-ignition direct injection engine

The disclosure provides a control device of a spark-ignition gasoline engine. When an operating state of an engine body is within a low engine speed range, a controller controls a fuel pressure variable mechanism so that a fuel pressure is higher within a high engine load range compared to a low engine load range, the controller operates, within the high engine load range, a fuel injection valve to perform a fuel injection at least at a timing that is more retarded than an injection timing of a fuel within the low engine load range and is within a retard period from a late stage of a compression stroke to an early stage of an expansion stroke, and the controller operates, within the high engine load range, an ignition plug to ignite at a timing within the retard period and further after the fuel injection.

Control device of spark-ignition gasoline engine

A ranking module determines N ranking values for N predetermined cylinder activation/deactivation sequences of an engine, respectively. N is an integer greater than or equal to two. A cylinder control module, based on the N ranking values, selects one of the N predetermined cylinder activation/deactivation sequences as a desired cylinder activation/deactivation sequence for cylinders of the engine. The cylinder control module also: activates opening of intake and exhaust valves of first ones of the cylinders that are to be activated based on the desired cylinder activation/deactivation sequence; and deactivates opening of intake and exhaust valves of second ones of the cylinders that are to be deactivated based on the desired cylinder activation/deactivation sequence. A fuel control module provides fuel to the first ones of the cylinders and disables fueling to the second ones of the cylinders.

Cylinder activation and deactivation control systems and methods

Thermal Efficiency Enhancement of a Gasoline Engine

A control apparatus is provided for a four stroke cylinder direct-injection internal combustion engine having a cylinder and a piston disposed within the cylinder. The control apparatus includes a variable compression ratio mechanism for variably controlling the engine compression ratio by changing the top dead center position of the piston and a fuel injection device for injecting fuel directly into the cylinder. When the actual compression ratio of the engine is higher than a target compression ratio, the variable compression ratio mechanism reduces the compression ratio, and in accordance with the reduction in the compression ratio, the fuel injecting device injects an intake fuel injection amount in the intake stroke and a compression fuel injection amount in the compression stroke, and the timing for starting the fuel injection in the compression stroke is retarded.

Control apparatus for a cylinder direct-injection internal combustion engine

The Effect of a Longer Stroke on Improving Fuel Economy of a Multiple-Link VCR Engine

PROBLEM TO BE SOLVED: To provide a cylinder direct injection type engine of a suction three valve structure, which suppresses degradation of the engine output and deterioration of the emission by suppressing degradation of the combustion performance. SOLUTION: The cylinder direct injection type engine 100 is equipped with a cylinder head 40 in which three suction ports 10 are formed in the cylinder arrangement direction for each cylinder, and is further equipped with: an ignition plug 42 installed in the cylinder center position of the cylinder head 40; and a fuel injection valve 41 which is installed at the cylinder head 40 on the line (Line C) passing the cylinder center (Point P) and perpendicularly intersecting the cylinder arrangement direction and located below the central suction port 10 of the three suction ports 10, and performs injection of the fuel toward the ignition part of the ignition plug 42. COPYRIGHT: (C)2009,JPO&INPIT

Shunsuke Shigemoto

Papers

Control apparatus for a cylinder direct-injection internal combustion engine

The Effect of a Longer Stroke on Improving Fuel Economy of a Multiple-Link VCR Engine

Cylinder direct injection type engine