Patent application number | Description | Published |
20080306676 | Internal combustion engine with variable compression ratio - In a variable compression ratio internal combustion engine in which the compression ratio is changed by changing the combustion chamber volume, the present invention enables to inhibit irregularities in the air-fuel ratio involved by changing of the combustion chamber volume. In a transition period during which the compression ratio is changed, the actual volume of the combustion chamber realized by a compression ratio changing mechanism is detected. A factor that influences the air-fuel ratio (for example, fuel injection quantity, cylinder intake air quantity or amount of EGR) is controlled based on the actual volume of the combustion chamber thus detected to make the air-fuel ratio substantially equal to that before and after the change of the compression ratio. | 12-11-2008 |
20090101113 | Variable Compression Ratio Internal Combustion Engine - A variable compression ratio internal combustion engine rotates a camshaft to cause relative movement between a crankcase and a cylinder block. The camshaft has a shaft member, a cam member fixed to the shaft member, and a movable bearing member rotatable with respect to the shaft member. The cam member is rotatably housed in a cam housing hole formed in the crankcase, and the movable bearing member is rotatably housed a bearing housing hole formed in the cylinder block. The length of a line segment joining the centers of the shaft member and the movable bearing member, the center of the movable bearing member being the center of rotation of the movable bearing member with respect to the bearing housing hole, is set to be longer than the length of a line segment joining the centers of the shaft member and the cam member, the center of the cam member being the center of rotation of the cam member with respect to the cam housing hole. | 04-23-2009 |
20090125211 | Method of Controlling a Mechanical Compression Ratio, a Closing Timing of an Intake Valve and Air Stream - A spark ignition type internal combustion engine comprises a variable compression ratio mechanism able to change a mechanical compression ratio, a variable valve timing mechanism able to control a closing timing of an intake valve, and an air flow control valve controlling an air flow in a cylinder and able to control the amount of intake air fed into a combustion chamber. The mechanical compression ratio is made maximum so as to obtain the maximum expansion ratio at the time of engine low load operation and the actual compression ratio at the time of engine low load operation is made an actual compression ratio substantially the same as that at the time of engine medium and high load operation. When the engine load is in an extremely low load region, the air flow control valve is used to control an amount of intake air fed into the combustion chamber. Due to this, a high heat efficiency can be realized even in a region where the amount of intake air is difficult to control by changing the closing timing of the intake valve. | 05-14-2009 |
20090187329 | Method of Controlling a Mechanical Compression Ratio and a Start Timing of an Actual Compression Action - An internal combustion engine provided with a variable compression ratio mechanism able to change a mechanical compression ratio and an actual compression action start timing changing mechanism able to change a start timing of an actual compression action. The mechanical compression ratio is made maximum so that the expansion ratio becomes 20 or more at the time of engine low load operation, while the actual compression ratio at the time of engine low load operation is made an actual compression ratio substantially the same as that at the time of engine high load operation. | 07-23-2009 |
20090276140 | Spark Ignition Type Internal Combustion Engine - An internal combustion engine provided with a variable compression ratio mechanism able to change a mechanical compression ratio and an actual compression action start timing changing mechanism able to change a start timing of an actual compression action. An amount of intake air in accordance with the required load is fed into a combustion chamber by controlling the closing timing of the intake valve, while a pressure, temperature or density in the combustion chamber at the end of a compression stroke is maintained substantially constant regardless of the engine load by controlling the mechanical compression ratio. | 11-05-2009 |
20090277422 | Variable Compression Ratio Internal Combustion Engine - In a variable compression ratio internal combustion engine that controls the compression of an internal combustion engine by changing the volume of the combustion chamber of the internal combustion engine in an axial direction of the cylinder, when a target compression ratio (εt) based on an operating condition of the internal combustion engine is at a reference compression ratio (ε0) or greater (S | 11-12-2009 |
20100131170 | METHOD OF OPERATING A SPARK IGNITION TYPE INTERNAL COMBUSTION ENGINE - An engine provided with a variable timing mechanism (B) able to control a closing timing of an intake valve ( | 05-27-2010 |
20100132674 | SPARK-IGNITED INTERNAL COMBUSTION ENGINE AND METHOD OF CONTROLLING THE SAME - A spark-ignited internal combustion engine includes a variable compression ratio mechanism that changes a mechanical compression ratio, and a variable valve timing mechanism that controls a valve closing timing at which an intake valve is closed, in which the amount of intake air that is supplied into a combustion chamber is controlled by changing the valve closing timing of the intake valve, and when an air-fuel ratio is increased from a first desired air-fuel ratio to a second desired air-fuel ratio, the valve closing timing of the intake valve is brought close to an intake bottom dead center until the air-fuel ratio becomes equal to the second desired air-fuel ratio, without changing a fuel injection amount. | 06-03-2010 |
20100139622 | SPARK IGNITION TYPE INTERNAL COMBUSTION ENGINE - In an internal combustion engine, a variable compression ratio mechanism able to change a mechanical compression ratio and a variable valve timing mechanism able to control the closing timing of an intake valve are provided. At the time of engine low load operation, the mechanical compression ratio is made the maximum so that the expansion ratio becomes 20 or more. Further, at the time of engine low load operation, in part of the operating region or all of the operating region, the actual compression ratio is lowered compared with the time of engine high load operation and, at the time of engine low load operation, at least when the actual compression ratio is being lowered compared with the time of engine high load operation, the throttle valve is made to close. | 06-10-2010 |
20100163001 | Spark Ignition Type Internal Combustion Engine - An internal combustion engine provided with a variable compression ratio mechanism able to change a mechanical compression ratio and a variable valve timing mechanism able to individually control the opening timing and closing timing of the intake valve. At the time of engine low load operation, the maximum expansion ratio is obtained by making the mechanical compression ratio maximum and, while the mechanical compression ratio is made maximum, the opening timing of the intake valve is maintained at a target opening timing of substantially intake top dead center in the noninterference region where no interference between the valve and the piston occurs. | 07-01-2010 |
20100192918 | SPARK IGNITION TYPE INTERNAL COMBUSTION ENGINE - An internal combustion engine comprises a variable compression ratio mechanism capable of varying the mechanical compression ratio and a variable valve timing mechanism capable of controlling the closing timing of an intake valve. In an engine low-load operation, the mechanical compression ratio is maintained at a maximum mechanical compression ratio. In an engine high-load operation, the mechanical compression ratio is gradually decreased as the engine load increases. In the engine high-load operation, a load at which a predetermined mechanical compression ratio lower than the maximum mechanical compression ratio is obtained is preset, and a throttle valve is closed in the range of loads lower than the preset load. | 08-05-2010 |
20100192919 | SPARK IGNITION TYPE INTERNAL COMBUSTION ENGINE - In an internal combustion engine, a variable compression ratio mechanism able to change a mechanical compression ratio and a variable valve timing mechanism able to control the closing timing of an intake valve are provided. The mechanical compression ratio is made to be the maximum mechanical compression ratio at low load operation regions excluding idling operation, while during idling operation, the mechanical compression ratio is made lower than the maximum mechanical compression ratio. | 08-05-2010 |
20100206271 | SPARK IGNITION TYPE INTERNAL COMBUSTION ENGINE - A spark ignition internal combustion engine includes a variable expansion ratio mechanism which can alter the mechanical expansion ratio, and an exhaust variable valve mechanism which can alter the timing for opening an exhaust valve. The mechanical expansion ratio and the timing for opening the exhaust valve are set depending on the engine load such that the mechanical expansion ratio increases and the timing for opening the exhaust valve is retarded to the exhaust bottom dead center side as the engine load decreases. By setting the mechanical expansion ratio in such a manner depending on the engine load, thermal efficiency can be enhanced as compared with a case where the mechanical expansion ratio is set to make the actual compression rate constant for example. Consequently, a spark ignition internal combustion engine exhibiting high thermal efficiency is provided. | 08-19-2010 |
20100282216 | SPARK IGNITION TYPE INTERNAL COMBUSTION ENGINE - Provided is a spark ignition type internal combustion engine comprising a variable compression ratio mechanism (A) capable of changing a mechanical compression ratio, and a variable valve timing mechanism (B) capable of controlling the closing timing of an intake valve. At an engine low-load running time, the mechanical compression ratio is made so higher than that at an engine high-load running time that the expansion ratio may be 20 or higher. In case the vacuum in an engine intake passage is lower than the required vacuum, the opening of a throttle valve ( | 11-11-2010 |
20100294245 | SPARK IGNITION TYPE INTERNAL COMBUSTION ENGINE - Disclosed is a spark ignition type internal combustion engine, which comprises a variable compression ratio mechanism capable of changing a mechanical compression ratio, and a variable valve timing mechanism capable of controlling the closing timing of an intake valve. The intake air flow to be fed to the inside of a combustion chamber is controlled mainly by changing the closing timing of an intake valve so that the mechanical compression ratio is set higher at an engine low-load miming time than that at an engine high-load running time. The mechanical compression ratio at the engine low-load running time before completion of the warm-up of the internal combustion engine is set lower than that at the engine low-load running time after completion of the warm-up of the internal combustion engine. Although the expansion ratio at the engine low-load running time is raised to improve the mileage, it is possible at an engine cold start to heat an exhaust purifying catalyst promptly and to suppress the deterioration of an exhaust emission. | 11-25-2010 |
20110114063 | SPARK IGNITION TYPE INTERNAL COMBUSTION ENGINE - In an internal combustion engine, a variable compression ratio mechanism able to change a mechanical compression ratio and a variable valve timing mechanism able to control the closing timing of an intake valve are provided. The mechanical compression ratio is held at a maximum mechanical compression ratio at the engine low load operation side and gradually made to decrease as the engine load increases at the engine high load operation side. The actual compression ratio is held nearly constant at the engine high load operation side and is made to decrease as the engine load decreases at the engine low load operation side. | 05-19-2011 |
20110278756 | SILICA STRUCTURE AND METHOD OF PRODUCING THE SAME, AND HEAT INSULATING MATERIAL - A silica structure includes mesoporous silica spheres; and connection portions each of which includes metal oxide, and each of which connects the mesoporous silica spheres to each other. | 11-17-2011 |
20120017876 | HIGH EXPANSION RATIO INTERNAL COMBUSTION ENGINE - A high expansion ratio internal combustion engine includes: a variable compression ratio mechanism that varies a mechanical compression ratio of the internal combustion engine; and a variable valve train in which some valve(s) of a plurality of intake valves is phase-variable and the remaining valve(s) is phase-fixed, the variable valve train being configured such that a working angle of the phase-variable intake valve is larger than a working angle of the phase-fixed intake valve, wherein a valve-open timing of the phase-variable intake valve is retarded after a valve-open timing of the phase-fixed intake valve when the internal combustion engine is under low-load operating state. | 01-26-2012 |
20120210957 | VARIABLE COMPRESSION RATIO V-TYPE INTERNAL COMBUSTION ENGINE - The present variable compression ratio V-type internal combustion engine is a variable compression ratio V-type internal combustion engine which joins cylinder blocks of two cylinder groups and makes the joined cylinder block | 08-23-2012 |
20120234274 | SPARK IGNITION TYPE INTERNAL COMBUSTION ENGINE - A spark ignition type internal combustion engine includes a plurality of cylinders and can stop combustion in part of these cylinders. Further, the spark ignition type internal combustion engine comprises a variable compression ratio mechanism (A) which can change an mechanical compression ratio, and a variable valve timing mechanism (B) which can control a closing timing of an intake valve. When idling part of the cylinders or increasing idled cylinders, the closing timing of an intake valve ( | 09-20-2012 |
20120260890 | VARIABLE COMPRESSION RATIO V-TYPE INTERNAL COMBUSTION ENGINE - The present variable compression ratio V-type internal combustion engine is a variable compression ratio V-type internal combustion engine which joins cylinder blocks of two cylinder groups and makes the joined cylinder block move relatively to a crankcase, wherein the engine is provided with a first relative movement mechanism which is fastened to a first cylinder group side of the joined cylinder block through a plurality of supports and a second relative movement mechanism which is fastened to a second cylinder group side of the joined cylinder block through a plurality of supports. The number of the supports in each of the first relative movement mechanism and the second relative movement mechanism is made at least a number greater by exactly one than the number of cylinders of the first cylinder group and the second cylinder group, respectively. | 10-18-2012 |
20120316759 | VARIABLE COMPRESSION RATIO V-TYPE INTERNAL COMBUSTION ENGINE - The present variable compression ratio V-type internal combustion engine is a variable compression ratio V-type internal combustion engine which joins cylinder blocks of two cylinder groups and makes the joined cylinder block move relatively to a crankcase, wherein at each relative movement position of the joined cylinder block, the intake valve closing timings of the cylinders are controlled so that the actual compression ratios of the two cylinder groups become equal and thus the temperature difference and pressure difference in the cylinders at top dead center between the two cylinder groups are reduced. | 12-13-2012 |
20120325167 | VALVE DRIVE SYSTEM OF INTERNAL COMBUSTION ENGINE - A valve drive system of internal combustion engine which operates at a high compression ratio cycle, which is provided with an intake cam | 12-27-2012 |
20130213035 | ENGINE - An engine is equipped with a supercharger (exhaust turbocharger) which is rotationally driven by means of exhaust gas and in which an expansion ratio is settable greater than a compression ratio. The engine includes: an operation state determination unit that determines an operation state of the engine; a plurality of exhaust valves provided at a single cylinder; a variable exhaust valve timing mechanism that is capable of changing opening timing of at least one exhaust valve among the exhaust valves; and a controller that, when it is determined by the operation state determination unit that the engine is operated with low load and is acceleration time, transmits a command to the variable exhaust valve timing mechanism and advances the opening timing of the at least one exhaust valve relative to the opening timing of another exhaust valve. Thereby, supercharging response and the expansion ratio are maintained. | 08-22-2013 |