Patent application number | Description | Published |
20080210181 | Variable valve mechanism of internal combustion engine - When an actuation mechanism fails to operate and thus fails to control a turning of a control shaft of a valve lift varying mechanism, a moving member is enforcedly moved to an intermediate stable position by a biasing force that is produced by combining a first type force that biases the control shaft in a direction to increase a valve lift degree of an engine valve and a second type force that biases the control shaft in a direction to reduce the valve lift degree of the engine valve. The intermediate stable position of the moving member assures an easy engine starting even in a cold engine condition. | 09-04-2008 |
20080216780 | Variable valve actuating apparatus for internal combustion engine and process of controlling the same - A variable valve actuating apparatus for an internal combustion engine with an exhaust turbocharger. An intake valve characteristic varying section is arranged to vary an operating angle and a lift of an intake valve. An exhaust valve characteristic varying section is arranged to vary an opening timing and a closing timing of an exhaust valve. In response to an increase in a desired value of an output of the engine, a control section advances an opening timing of the intake valve, retards a closing timing of the intake valve, and advances the opening timing of the exhaust valve. In response to an increase in a boost pressure of the exhaust turbocharger, the control section increases the operating angle and the lift of the intake valve, and retards the opening timing and the closing timing of the exhaust valve. | 09-11-2008 |
20080257289 | Variable valve actuating apparatus for internal combustion engine - A variable valve actuating apparatus for an internal combustion engine includes an intake valve operating angle varying mechanism, an intake valve timing varying mechanism, and an exhaust valve timing varying mechanism. Before startup of the engine, the intake valve operating angle varying mechanism holds an intake valve operating angle at an intermediate value, the intake valve timing varying mechanism holds intake valve opening and closing timings most advanced, and the exhaust valve timing varying mechanism holds exhaust valve opening and closing timings most retarded. | 10-23-2008 |
20090007862 | VARIABLE VALVE ACTUATING APPARATUS FOR INTERNAL COMBUSTION ENGINE - A variable valve actuating apparatus for an internal combustion engine includes an intake valve operating angle varying mechanism, and an intake valve timing varying mechanism. The intake valve timing varying mechanism includes a housing rotating in synchronization with a crankshaft, and a vane member coupled to a drive shaft for intake valve operation, and movably mounted in the housing. The vane member includes a vane defining first and second fluid pressure chambers on first and second opposite sides of the vane. A hydraulic circuit is arranged to rotate the vane member relative to the housing by supply and return of a brake fluid to and from the first and second fluid pressure chambers so as to change the intake valve maximum lift phase. Coil springs are arranged to bias the vane member relative to the housing in a direction to retard the intake valve maximum lift phase. | 01-08-2009 |
20090007866 | Control apparatus for internal combustion engine and control method therefor - In control apparatus and method for an internal combustion engine, a first cylinder group in which both of intake and exhaust valves of each of engine cylinders thereof are controllably stopped is provided, second cylinder group in which a lift of the intake valve of each of the engine cylinders thereof is variably controlled is provided, and the lift of the intake valve of each of the engine cylinders of the second cylinder group is controlled n order for an engine torque when the intake and exhaust valves of each of the cylinders of the first cylinder group are controlled to be stopped to be approximately equal to the engine torque by means of the first cylinder group and the second cylinder group before the intake and exhaust valves of each of the cylinders of the first cylinder group are controlled to be stopped. | 01-08-2009 |
20090078223 | VARIABLE VALVE SYSTEM OF INTERNAL COMBUSTION ENGINE - An intake side phase varying mechanism varies an open/close timing of an intake valve, and an exhaust side phase varying mechanism varies an open/close timing of an exhaust valve. Before starting the engine, one of the intake and exhaust side phase varying mechanisms is caused to keep a first position wherein the intake and exhaust valves show the largest valve overlap therebetween and the other of the mechanisms is caused to keep a second position wherein the intake and exhaust valves show the smallest valve overlap therebetween. A controller is configured to carry out, after starting the engine, causing the selected one of the intake and exhaust side phase varying mechanisms to be actually controlled to the first position and causing the other to be actually controlled to the second position. | 03-26-2009 |
20090120393 | VARIABLE VALVE SYSTEM FOR INTERNAL COMBUSTION ENGINE - A variable valve system has a drive shaft having a drive cam, a rockable cam opening/closing an engine valve, a transmission mechanism converting torque of the drive cam into a rocking motion and transmitting it to the rockable cam, a control shaft, and a control cam. When the variable valve system varies a valve lift amount of the engine valve by changing the rocking fulcrum of the transmission mechanism, the rocking fulcrum during a small valve lift control is set in an area outside an arc locus drawn with the drive shaft being a center of the arc and passing through a rocking fulcrum position positioned at a maximum valve lift and also inside an arc locus drawn with a pivot of the one end side of the transmission mechanism being a center of the arc and passing through the rocking fulcrum position positioned at the maximum valve lift. | 05-14-2009 |
20090159027 | VARIABLE VALVE ACTUATING APPARATUS FOR INTERNAL COMBUSTION ENGINE, AND CONTROLLER FOR VARIABLE VALVE ACTUATING APPARATUS - A variable valve actuating apparatus for an internal combustion engine includes an exhaust valve operating angle varying mechanism, and an exhaust valve timing varying mechanism. When the internal combustion engine is at rest, the exhaust: valve operating angle varying mechanism sets an exhaust valve operating angle relatively small, and the exhaust valve timing varying mechanism sets an exhaust valve opening timing and an exhaust valve closing timing relatively retarded. Accordingly, when the internal combustion engine is at rest, the variable valve actuating apparatus sets the exhaust valve closing timing at or close to top dead center so as to enable startup of the internal combustion engine. | 06-25-2009 |
20090188454 | VARIABLE VALVE ACTUATION APPARATUS OF INTERNAL COMBUSTION ENGINE - A variable valve actuation apparatus of an internal combustion engine has a multinodular-link motion converter, to vary at least a working angle. A position of rotation of a control shaft, variably adjusting the attitude of the motion converter, is set, so that, at a peak lift during a valve opening period, an angle γ | 07-30-2009 |
20090235885 | VARIABLE VALVE ACTUATING APPARATUS - A variable valve actuating apparatus for an internal combustion engine includes a drive cam, a control shaft, a control cam, a rocker arm, and a swing cam. The drive cam is rotated by the internal combustion engine. The control shaft is supported for rotation about a rotation axis. The control cam is coupled to the control shaft, and is eccentric with respect to the rotation axis of the control shaft. The rocker arm is linked with the drive cam, and arranged to swing about the control cam in response to rotary motion of the drive cam. The rocker arm includes a recess slidably engaged with an outer radial periphery of the control cam. The swing cam is linked with the rocker arm, and arranged to swing in response to swinging motion of the rocker arm for opening and closing an engine valve of the internal combustion engine. | 09-24-2009 |
20090235886 | VARIABLE VALVE ACTUATING APPARATUS FOR INTERNAL COMBUSTION ENGINE AND CONTROL SHAFT FOR VARIABLE VALVE ACTUATING APPARATUS - A variable valve actuating apparatus for an internal combustion engine includes: a control shaft rotatably supported through a bearing to a body of the engine, and arranged to rotate about a center axis to control an operating state of an engine valve, the control shaft including; a control cam having a center which is off the center axis of the control shaft in a first direction; and a journal portion rotatably supported by the bearing, the journal portion having a center axis which is off the center axis of the control shaft in a second direction different from the first direction of the control cam. | 09-24-2009 |
20100012062 | ACTUATOR DEVICE AND VARIABLE VALVE APPARATUS OF INTERNAL COMBUSTION ENGINE - There is provided an actuator device for a variable valve apparatus. The variable valve apparatus has a control shaft to vary operation characteristics of an engine valve by an axial movement thereof. The actuator device has a rotatable screw shaft, a movable member axially movable with rotation of the screw shaft and a transmission mechanism unit that converts an axial movement of the movable member to the axial movement of the control shaft. An amount of the axial movement of the movable member is larger than an amount of the axial movement of the control shaft. | 01-21-2010 |
20100050965 | VARIABLE VALVE CONTROL APPARATUS - A variable valve control apparatus includes: a variable valve actuating mechanism arranged to vary a closing timing of an intake valve; and a controller configured to advance the closing timing of the intake valve before a bottom dead center of a piston of an intake stroke until a load of an engine increases from a minimum load to a predetermined load, and to retard the closing timing of the intake valve from a timing before the bottom dead center of the piston, to a timing after the bottom dead center of the piston when the load becomes the predetermined load. | 03-04-2010 |
20100139591 | VARIABLE VALVE DEVICE OF INTERNAL COMBUSTION ENGINE AND CONTROLLER THEREFOR - A controller of a variable valve device is configured to, before starting an internal combustion engine, set an operation angle varying mechanism to control an intake valve of the engine to have such an operation angle as to retard a valve close timing of the intake valve relative to a piston bottom dead center; define a given period from a instruction time when an instruction signal is fed to the controller for starting the engine to a time when a combustion of air/fuel mixture is actually commenced in the engine; and when, in the given period, a temperature representing the temperature of the engine is lower than a predetermined temperature, reduce the operation angle of the intake valve so as to bring the valve close timing of the intake valve near to the piston bottom dead center. | 06-10-2010 |
20100186695 | VARIABLE VALVE ACTUATION APPARATUS OF INTERNAL COMBUSTION ENGINE - In a variable valve actuation apparatus of an internal combustion engine configured to variably control at least a working angle of an engine valve, a valve actuation mechanism is configured to control a valve acceleration characteristic of the engine valve depending on an engine operating condition. The valve actuation mechanism is configured to bring about a first state where a maximum positive valve-closing acceleration of the engine valve becomes less than a maximum positive valve-opening acceleration of the engine valve, at a maximum working angle. The valve actuation mechanism is further configured so that a second state where the maximum positive valve-opening acceleration of the engine valve becomes less than the maximum positive valve-closing acceleration of the engine valve, exists at a working angle less than the maximum working angle. | 07-29-2010 |
20110088644 | Internal Combustion Engine Control Device and Internal Combustion Engine Control System - In an internal combustion engine control device, when the engine stops, a variable valve actuation device is controlled to change an operating mode of each of intake valves to a specific state where an all-cylinder valve closed period, during which the intake valves of all engine cylinders are all kept in their non-lifted states, occurs, and a crank position change mechanism is controlled to change a crankshaft-rotation stopped position to a crankangle included within the all-cylinder valve closed period. When restarting the engine, the variable valve actuation device is controlled to bring the operating mode of each of the intake valves closer to an engine-start desired lift characteristic suited to an engine condition, prior to cranking action. | 04-21-2011 |