Patent application number | Description | Published |
20090216427 | METHOD AND SYSTEM FOR CONTROLLING AN INTERNAL COMBUSTION ENGINE - Methods and systems for controlling an internal combustion engine are provided. One example method may include closing an intake valve later during a cylinder cycle than a timing with which an amount of air inducted into a cylinder from an air intake passage would be maximized, and earlier during the cylinder cycle as a desired amount of air to be inducted into the cylinder increases, while an engine is operating at a given engine speed. The method may further include closing the intake valve earlier during a cylinder cycle as the engine speed increases when the desired amount of air to be inducted into the cylinder is at a maximum. | 08-27-2009 |
20090217906 | INTERNAL COMBUSTION ENGINE CONTROL METHOD AND INTERNAL COMBUSTION ENGINE SYSTEM - A system and method of controlling an internal combustion engine are provided. The method may include closing said intake valve at a timing in a first range, which is before a maximum charge closing timing with which an amount of air inducted into said cylinder from said air intake passage would be maximized at a given engine speed, during a cylinder cycle when a desired amount of air to be inducted into said cylinder is less than or equal to a predetermined air amount at the given engine speed. The method may further include closing said intake valve at a timing in a second range, which is after said maximum charge closing timing and separated from said first range during a cylinder cycle, when a desired amount of air to be inducted into said cylinder is greater than said predetermined air amount at the given engine speed. | 09-03-2009 |
20100077990 | CONTROL OF SPARK IGNITED INTERNAL COMBUSTION ENGINE - There is provided a method of controlling a spark ignited internal combustion engine having a fuel injector which injects fuel directly into its combustion chamber. The method comprises injecting a total amount of fuel into a combustion chamber by early in a compression stroke during a cylinder cycle at a first engine speed. The method further comprises injecting a first stage of fuel into the combustion chamber during a cylinder cycle by an early in a compression stroke of the cylinder cycle, and injecting a second stage of fuel by late in the compression stroke during the cylinder cycle at a second engine speed less than the first engine speed, after injecting the first stage of fuel. The amount of the second stage fuel is greater than an amount of said first stage fuel. Accordingly, the first and second stage fuels may not be pre-ignited before the spark ignition. | 04-01-2010 |
20110239986 | SPARK-IGNITION ENGINE CONTROL METHOD AND SYSTEM - When preignition is detected, and an engine speed is less than a predetermined value (Nex), an air/fuel ratio is enriched (S | 10-06-2011 |
20120111302 | METHOD AND DEVICE FOR CONTROLLING SPARK-IGNITION DIRECT INJECTION ENGINE - A method for controlling an engine includes, when the engine is operating within a particular range with comparatively low engine speed and high load, setting an effective compression ratio of 10:1 or above, retarding ignition timing by a predetermined amount and retarding the ignition timing within a first, relatively low engine speed range more than within a second, higher engine speed range, setting an injection mode of an injection valve to divided injections performed at least twice in a period from an intake stroke to an earlier-half stage of a compression stroke, performing, within the first engine speed range, a final injection in the earlier-half stage of the compression stroke, and performing, within the second engine speed range, the final injection in a late stage of the intake stroke and at least one injection other than the final injection in a middle stage of the intake stroke. | 05-10-2012 |
20120271533 | SPARK-IGNITION ENGINE AND METHOD OF CONTROLLING THE SPARK-IGNITION ENGINE - A method of controlling a spark-ignition engine including an ignition plug for spark-igniting mixture gas inside a cylinder in an engine body, and an effective compression ratio changing module for changing an effective compression ratio of the engine body is provided. The method includes estimating, based on engine speed, engine load, and environmental conditions, a limit effective compression ratio serving as a maximum effective compression ratio where pre-ignition does not occur, calculating a current effective compression ratio, calculating a value obtained by subtracting the effective compression ratio from the limit effective compression ratio, as a margin before pre-ignition occurs, and decreasing, when the margin is below a predetermined minimum margin, the effective compression ratio of the engine body by using the effective compression ratio changing module so that the margin is increased to be above the minimum margin, which is set constant regardless of at least environmental conditions. | 10-25-2012 |
20130152901 | MULTI-CYLINDER SPARK IGNITION ENGINE - An engine has a geometric compression ratio of higher than 12, and includes an exhaust manifold, a variable exhaust valve timing mechanism, an ignition timing controller, and an effective compression ratio adjuster. The exhaust manifold has a plurality of branched exhaust passages connected to the respective exhaust ports of the individual cylinders; a plurality of first collector segments each of which joins the branched exhaust passages for the cylinders which are not adjacent in the exhaust order sequence; a plurality of middle exhaust passages connected to the downstream of the first collector segments, respectively; and a second collector segment that joins the middle exhaust passages. In at least low and middle speed ranges in a high load region of the engine, the effective compression ratio is set to have a value larger than 10 and the ignition timing is retarded, and the valve opening time of the exhaust valve is changed according to the engine speed so that a predetermined amount of a valve overlap period is ensured and that negative pressure waves from exhaust pressure pulses reach an exhaust port during the valve overlap period in a plurality of engine speed ranges. This effectively reduces knocking in low and middle speed ranges in a high load region of the engine while achieving high torque by keeping the compression ratio high. | 06-20-2013 |
20140202407 | STARTING DEVICE OF SPARK-IGNITION MULTI-CYLINDER ENGINE - A starting device of a spark-ignition multi-cylinder engine is provided. The device includes a multi-cylinder engine body having cylinders, fuel injection valves, ignition plugs, an intake valve drive mechanism for opening and closing intake valves, a hydraulic variable valve phase mechanism for changing a close timing of each intake valve, an engine-driven hydraulic pressure supply source for supplying a hydraulic pressure, and a start controller for controlling the fuel injection valves, the ignition plugs, and the variable valve phase mechanism. When the supplied hydraulic pressure is below a predetermined pressure, the variable valve phase mechanism locks the close timing. When an engine temperature in an engine-start is high, the start controller retards a fuel injection timing of the cylinder on intake stroke at an engine stopped timing and retards an ignition timing thereof. The start controller does not retard the close timing of the intake valve until the engine-start completes. | 07-24-2014 |