| Patent application number | Description | Published |
|---|
| 20090095250 | Homogenous charge compression ignition engine and controlling method of the engine - A controller sets a negative valve overlap period, during which both of an intake valve and an exhaust valve are closed, such that not all the burned gas is discharged from the combustion chamber. When switching the combustion mode from the spark ignition combustion to the HCCI combustion, the controller executes following operations a), b), and c): | 04-16-2009 |
| 20090099751 | Homogenous charge compression ignition engine and controlling method of the engine - An ECU switches a combustion mode of an HCCI engine from HCCI combustion to spark ignition combustion. The ECU executes the following operations a) and b) before switching an intake lift amount from a first intake lift amount to a second intake lift amount: | 04-16-2009 |
| 20090099816 | Failure diagnosis apparatus for homogeneous charge compression ignition engine - A failure diagnosis apparatus for a homogeneous charge compression ignition engine having combustion modes switchable between HCCI combustion, performed together with internal EGR, and SI combustion. The engine includes an intake variable valve mechanism and an exhaust variable valve mechanism. The apparatus includes an airflow meter detecting an intake amount of mixture drawn into a combustion chamber of the engine and a control computer determining whether a failure has occurred in the intake variable valve mechanism and the exhaust variable valve mechanism from intake amount change information. The control computer determines whether a failure has occurred based on information on switching from SI combustion to HCCI combustion, intake amount change information, and predetermined first reference change information, and determines whether a failure has occurred based on information on switching from HCCI combustion to SI combustion, intake amount change information, and predetermined second reference change information. | 04-16-2009 |
| 20090125213 | Homogenous charge compression ignition engine - An HCCI engine operated in HCCI and SI combustion modes. The engine includes an external EGR apparatus for performing external EGR. A control unit executes combustion control by specifying either one of HCCI and SI combustion ranges based on the driving state of the engine and a combustion range map for specifying the combustion range in accordance with the driving state. The map includes the HCCI and SI combustion ranges and a switch preparation combustion range, which is included in the SI combustion range and extends along a boundary between the SI combustion range and the HCCI combustion range. The control unit lowers the temperature in the combustion chamber when the switch preparation combustion range is specified by reducing the amount of internal EGR or performing the external EGR. | 05-14-2009 |
| 20100024766 | HOMOGENEOUS CHARGE COMPRESSION IGNITION ENGINE - An HCCI engine provides a negative overlap period in an operation during HCCI combustion. During the negative overlap period, an intake valve and an exhaust valve are both closed when a piston is in the vicinity of the top dead center in an exhaust stroke, so that burned gas remains inside a combustion chamber. The engine is provided with a throttle, a fuel valve and an ECU. The ECU controls the throttle during a switching period in which SI combustion is switched to the HCCI combustion so that the opening degree of the throttle increases to the opening degree at the time of steady HCCI operation from the opening degree at the time of steady SI operation, and at the same time, controls the fuel valve such that the amount of fuel supplied to the intake passage becomes greater than the amount at the time of the steady SI operation. | 02-04-2010 |
| 20100043745 | PREMIXED COMPRESSION IGINITION TYPE ENGINE AND METHOD OF CONTROLLING THE SAME - A premixed compression ignition type engine is operated while change over between spark ignition combustion and compression ignition combustion. This engine has a negative overlap period during steady operation under compression ignition combustion. In the same cylinder, a valve-closing timing of an exhaust valve during steady operation under spark ignition combustion is retarded with respect to the valve-closing timing thereof after the change over. In a case where an intake valve is first changed over after start of the change over from spark ignition combustion to compression ignition combustion, the valve-opening timing of the intake valve during a change over period from spark ignition combustion to compression ignition combustion is in an advanced state with respect to the valve-opening timing thereof during steady operation under spark ignition combustion. | 02-25-2010 |
| 20100224166 | HOMOGENEOUS CHARGE COMPRESSION IGNITION ENGINE - An HCCI engine capable of switching combustion mode between SI combustion and HCCI combustion is disclosed. At least one swirl port and at least one tumble port communicate with a combustion chamber of the HCCI engine. In a first switching period in which the SI combustion is switched to the HCCI combustion, intake air is supplied to the combustion chamber solely through the swirl port. In a second switching period in which the HCCI combustion is switched to the SI combustion, the intake air is supplied to the combustion chamber through at least the tumble port. | 09-09-2010 |
