Abstract:
A gas exchange valve of an internal combustion engine, has valve lifting movements with valve displacement curves and a control unit. To this end, a control unit is provided for operation of at least one valve, in particular a gas exchange valve of an internal combustion engine, in which the valvelifting movement of the at least one valve (6) is generated by superimposing two synchronously rotating cam profiles acting mechanically on a lift operating element (4). The two cam profiles (1, 2) have specially shaped areas by means of which, when superimposed to form one of the two cam profiles (1, 2), at least one additional valve displacement (ZV) can be generated on the whole in addition to a main valve displacement movement (HV) over a full revolution of each of these cam profiles (1, 2).
Abstract:
With a camshaft for an automotive internal combustion engine in particular, having two concentrically arranged shafts mounted to rotate in opposite directions, namely an inside shaft (3) and an outside shaft (4), at least one single cam (1) fixedly connected to the inside shaft (3) by a pin (5) passing radially through the outside shaft (4) and passing radially through the outside shaft (4), a bearing of the pin (5) in the respective pin receptacles (6), each running radially, in the cam and the inside shaft (3), a lateral projection as the receptacle (6) on the cams (1), a space-saving design of the at least one adjustable single cam should be achieved. To this end, various space-saving pin receptacle designs are proposed. A space-saving measure is also provided with respect to an arrangement of an adjustable cam in close proximity to a cam fixedly connected to the outside shaft by adjustment of the shaft of the neighboring cam to the pin receptacle of the adjustable single cam.
Abstract:
A method for calibrating a distance sensor of a rotary actuator device for controlling a valve of an internal combustion engine. The rotary actuator includes an electric motor with an actuator element for actuating the valve, two energy storage means acting on the valve in opposite drive directions, and a control unit for controlling the electric motor. The electric motor is controlled such that the valve is transferred from a first end position, in which the actuator element is a metastable torque-neutral position, to a second metastable torque-neutral position. Starting from a torque-neutral position, the electric motor is controlled such that the rotor is moved out of the torque-neutral position in at least one direction by a distance, and the resulting electric motor power consumption is measured. Depending on the electric motor current values, a new rotor position for calibration of the distance signal is ascertained.
Abstract:
To provide a variable valve operating device that can swiftly adjust a valve timing of an engine, the variable valve operating device is for adjusting a valve lift and the valve timing of the engine. The variable valve operating device includes a rocking cam 27 which is rocked by cams 21 provided on a rotatable cam shaft 19, a rocking cam support member 25 that rockably supports the rocking cam 27, a valve 5 which is opened and closed by a rocking motion of the rocking cam 27, a rocking position changing unit 35 that moves the rocking cam support member 25 to change a lever ratio of the rocking cam 27 and that changes a rocking position of the rocking cam 27, and a lock unit 37 that can fix the rocking cam support member 25 so as not to move during a valve-opening period of the valve 5. The lock unit 37 includes a support base 23 that movably supports the rocking cam support member 25, and a push-link 43 which is rocked by an actuator 39. When a tip end of the push-link 43 abuts against the rocking cam support member 25, the push-link 43 pushes the rocking cam support member 25 toward the support base 23.
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:
A valve operating system for an engine that includes a piston that reciprocates along a piston axis. The valve operating system includes a valve member that is movable along a valve axis between a first position and a second position and a crankshaft that is rotatable about a crank axis. A cam member includes a substantially non-planar non-cylindrical surface and a cam profile superimposed thereon. A drive linkage interconnects the cam member and the crankshaft such that the cam member rotates in response to rotation of the crankshaft. A rocker arm is engaged with the valve member and the cam profile to move the valve member in response to rotation of the cam member.
Abstract:
There is provided a valve gear (11) with a motor (12), a cam mechanism (14) which converts a rotational motion of the motor (12) into a linear motion of an intake valve (2) by a cam (21), and a motor control apparatus (30) which controls the motor (12) such that an acceleration characteristic during a lift of the intake valve (2) changes in correspondence to a rotation number of an internal combustion engine.
Abstract:
A lost motion engine valve actuation system and method of actuating an engine valve are disclosed. The system may comprise a valve train element, a pivoting lever, a control piston, and a hydraulic circuit. The pivoting lever may include a first end for contacting the control piston, a second end for transmitting motion to a valve stem and a means for contacting a valve train element. The amount of lost motion provided by the system may be selected by varying the position of the control piston relative to the pivoting lever. Variation of the control piston position may be carried out by placing the control piston in hydraulic communication with a control trigger valve and one or more accumulators. Actuation of the trigger valve releases hydraulic fluid allowing for adjustment of the control piston position. Means for limiting valve seating velocity, filling the hydraulic circuit upon engine start up, and mechanically locking the control piston/lever for a fixed level of valve actuation are also disclosed.
Abstract:
In a valve drive for a piston internal combustion engine with a first rocker lever which is in operative contact with at least a first cylinder valve, wherein a cam structure including a first cam and at least one additional cam is in active contact with a second rocker lever, which can be placed in force transmission contact with the first rocker lever by an actuator element for transferring the pivot motion generated by the first and second cams selectively from the second rocker lever to the first rocker lever and at a rate depending on an idling angle determined by the actuator element.
Abstract:
The invention relates to valve train of an international combustion engine, which comprise axially displaceable cam elements. The inventive valve train is characterized in that one cam element comprises at least two cams which in turn comprise at least two cam tracks. The first cam and the at least second cam of a cam element differ in at least one cam track.