Abstract:
A two step rocker assembly is provided having a lever body, a first roller assembly mounted to the lever body, and a center shaft extending through the first roller assembly. A second shaft extends through the lever body and defines a first pivot point. A coupling lever is pivotally connected to the second shaft and has an opening for receiving the center shaft. The coupling lever is rotatable about the first pivot point. A latch pin is mounted to the lever body. A second roller assembly is mounted on the center shaft. A spring lever is pivotally connected to the second shaft and is connected to the center shaft. The spring lever is rotatable about the first pivot point. A spring member is mounted on the lever body and engages the spring lever to bias the spring lever and the center shaft into the first position.
Abstract:
Systems and methods for providing partial bleeder braking engine valve actuation are disclosed. In an embodiment of the present invention, a cam may be provided with a main exhaust lobe, a partial bleeder lobe and an inner base circle portion between the two lobes. A rocker arm including an internal rocker passage may be operatively connected to the cam. The rocker arm may contact a valve bridge at a central portion. The valve bridge may be operatively connected to first and second engine valves at its first and second ends, respectively. A slave piston incorporated into the first end of the valve bridge and a master piston may be incorporated into the central portion of the valve bridge. A hydraulic circuit may be provided between the master and slave pistons. A bleed hole may be provided above the slave piston. The master and slave pistons may be selectively actuated and the bleed hole may be selectively blocked and unblocked to provide partial bleeder braking as a result of the valve actuation motion imparted from the cam to the valve bridge through the rocker arm.
Abstract:
The present invention relates to a variable operation angle mechanism that can improve engine performance at transient operation by optimally setting a ratio between change amounts of opening and closing timings accompanying a variation in valve operation angle of intake valve, and relates to an apparatus for and a method of controlling an engine including the variable operation angle mechanism. In the variable operation angle mechanism, ratio RIVO of change amount of opening timing IVO of intake valve to change amount of valve operation angle is set to be 20% or more and 40% or less, and preferably, to be 30%. In engine including a variable valve timing mechanism varying a rotating phase of intake camshaft relative to crankshaft and the variable operation angle mechanism, a target phase change amount varied by the variable valve timing mechanism is corrected for phase change amount accompanying the variation in the valve operation angle.
Abstract:
The present invention relates to a variable valve operating device and a valve opening amount adjustment method, and can accurately control the amount of in-cylinder air and the strength of a swirl flow. The variable valve operating device according to the present invention includes a valve mechanism that can select a dual valve variable control mode in which the valve opening amounts of a first valve and a second valve, which are of the same type and provided for the same cylinder, can be varied continuously or in multiple steps. A valve opening amount difference is provided when the valve opening amounts are minimized in the dual valve variable control mode so that the valve opening amount of the first valve is larger than that of the second valve. In addition, adjustments are made so that the minimum valve opening amount of the first valve does not vary from one cylinder to another.
Abstract:
A cylinder deactivation system for a vehicle and a variable valve lift system is fabricated with an end pivot structure that can control two valves at the same time. The structure ensures reliability since a latching pin does not receive a shear force and provides an excellent assemblage and a cost reduction by minimizing the number of parts Such a cylinder deactivation system may include a rocker shaft having an oil supply hole, a rocker arm, a middle arm, and a latching portion separating the rocker arm from the middle arm when an oil pressure operates through the oil supply hole.
Abstract:
A variable valve lift apparatus includes a cam, a camshaft that rotates the cam, at least one cam follower selectively connected to an end lever such that the cam follower opens and closes a valve corresponding to rotation of the cam, and a variable device selectively connecting the cam follower with the end lever to regulate whether or how much the valve is opened and closed. Three cam followers may be provided: two outer cam followers fixedly connected to the end lever, and an inner cam follower interposed between and selectively connected to the outer cam followers corresponding to an operation of the variable device. The variable device may include a first pin in one of the outer cam followers, a second pin in the inner cam follower, and a third pin in the other outer cam follower. The pins may be configured to move together.
Abstract:
A variable valve lift apparatus includes a camshaft with a first cam lobe and a second cam lobe, a cam follower with a first follower contacting the first cam lobe and a second follower contacting the second cam lobe, a connection rotatably connecting the first follower to the second follower, a main body supporting the first follower and the second follower, a connector selectively connecting the first follower and the second follower to the main body, a lost motion elastic member provided on the main body for supplying restoring force to the first follower and the second follower, and a valve configured to be opened and closed by the cam follower.
Abstract:
An apparatus and method of controlling vibration-damping for a vehicular internal combustion engine. The combustion is temporarily stopped in some cylinders among a plurality of cylinders, and the engine is operated by the remaining cylinders. Then, a variable valve mechanism which varies a valve lift amount of at least one of intake and exhaust valves of each cylinder is controlled, to decrease the valve lift amount of at least one of the intake and exhaust valves of each cylinder in which the combustion is temporarily stopped. Further, a rotating electric machine having at least one of functions of an electric motor and a generator is controlled, to apply torque to an output shaft of the engine thereby suppressing torque variation in the output shaft at the time when the combustion is temporarily stopped in some cylinders, so that the torque variation due to uneven explosion intervals is reduced.
Abstract:
A cylinder valve operating system for an internal combustion engine includes a camshaft driving a number of intake and exhaust valve operators which may be selectively disabled through the operation of a valving system including a hydraulic phase shifter integrated with the camshaft and connected between a source of high pressure oil and at least the intake valve operators. The hydraulic phase shifter allows one group of valves, such as the exhaust valves, to be disabled before the other group of valves, typically the intake valves.
Abstract:
A control device for a diesel engine has a valve timing switching mechanism capable of selectively switching between first opening/closing timing and second opening/closing timing for an exhaust valve. The first opening/closing timing is set such that the period for which the exhaust valve is open overlaps the period for which an intake valve is open, and that opening start timing for the exhaust valve is after bottom dead center of expansion stroke of a piston. The second opening/closing timing is set such that opening start timing for the exhaust valve is advanced compared with the opening start timing according to the first opening/closing timing. A control unit controls the valve timing switching mechanism so that the exhaust valve is opened and closed according to the first opening/closing timing, at least when the diesel engine is operating in a predetermined cold condition.