Abstract:
Lost motion engine valve actuation systems and methods of actuating engine valves are disclosed. Exemplary systems may include a valve train element, a first lost motion piston, an accumulator, and a hydraulic circuit, among other components. Variation of the first lost motion piston position may be carried out by placing the first lost motion piston in hydraulic communication with a trigger valve and one or more accumulators. Actuation of the trigger valve releases hydraulic fluid allowing for adjustment of the first lost motion piston position.
Abstract:
A mechanical fuel pump is disclosed for delivering fuel to an engine of a vehicle, the mechanical fuel pump having an activated configuration and a deactivated configuration. A dual fuel system and method are also disclosed for use with the mechanical fuel pump.
Abstract:
A modified rocker assembly having an offset end is designed to be used in engine heads having an obstruction that would not allow a switching rocker arm to be used. The modified rocker assembly is described having an obstructed side and a non-obstructed side. The rocker assembly has an outer structure with a first end, and an inner rocker structure fitting within the outer structure, the inner structure also having a first end. The modified rocker assembly has an axle pivotally connecting the first ends of inner structure to the outer structure, such that the inner structure may rotate within the outer structure around the axle. At least one torsion spring on one side of axle, rotationally biases the inner structure relative to the outer structure. The outer structure, on the obstructed side as it extends from the second end toward the first end, is offset toward the non-obstructed side creating the first offset portion to provide additional clearance on the obstructed side. This design allows the modified rocker arm to fit into an engine head having an obstruction on its obstruction side.
Abstract:
In a vehicle provided with a power propulsion system of the mild-hybrid type, a BAS unit—including an electric machine connected through a belt transmission to the shaft of an internal combustion engine—is exploited as the only propulsion engine of the vehicle in given operating conditions. The internal combustion engine is provided with a system for variable actuation of the intake valves which is controlled to reduce the pumping losses of the internal combustion engine in the phase in which such engine is in cut-off condition and it is driven by the aforementioned BAS unit. It is also provided for that the system for variable actuation of the intake valves be controlled to temporarily increase the pumping losses of the internal combustion engine in a phase in which it is required to accelerate the switching off of the engine.
Abstract:
A reference angle detecting device includes a control shaft connected to a controlled object, an electric motor causing the control shaft to rotate via a worm gear mechanism, a stopper disposed on a motion track of a worm wheel, an angle sensor that can detect a rotation angle of the control shaft, and a controller. The stopper includes a spring member which is elastically deformable in an operation direction of the worm wheel. The controller drives the electric motor to operate so that the worm wheel may face the stopper, and stores the rotation angle at a time point when a change rate ω of the rotation angle θ detected by the angle sensor changes to a value less than a predetermined threshold ω1 as a reference angle θ0. Therefore, the reference angle can be detected with high accuracy for control of an angle of the control shaft.
Abstract:
In a cylinder lubrication system for a two-stroke engine, a plurality of lubricating oil supply openings (78) open out in the inner circumferential surface of the cylinder (42) at a point lower than a top ring (22b) of a piston (22) located at a bottom dead center. The lubricating oil supply openings are configured to provide a larger amount of lubricating oil in the thrust side and anti-thrust side of the cylinder than in a remaining part of the cylinder. Thereby, the consumption of lubricating oil and the emission of undesired substances can be minimized while providing an optimum lubrication of the sliding part between the piston and the cylinder.
Abstract:
The invention relates to a valve control means (1) for an internal combustion engine, having two cams (2, 3) which are arranged one behind another on a camshaft (20), the cams (2, 3) having different cam contours, a drag lever system (4), having a first lever (5), a second lever (7) which is connected to the first lever (5) such that it can be rotated about a pivot point (6), and a third lever (8) which is connected fixedly to the first lever (5), the first lever (5) having a roller pickup (15) for a first cam (2) and the second lever (7) having a roller pickup (17) for the second cam (3), the third lever (8) having a slotted guide (9) for the rectilinear positive guidance of a valve (30), the drag lever system (4) being mounted at the pivot point (6) such that it can be adjusted on a circular path (10) about the rotational axis (21) of the camshaft (20) in a cylinder block or cylinder head of the internal combustion engine, and having a play compensation element (11) between the second lever (7) and the first lever (5) or the third lever (8) for play compensation and for limiting the rotatability of the second lever (7) with respect to the first lever (5) and the third lever (8). Furthermore, the invention relates to an internal combustion engine, having at least one valve control means of this type.
Abstract:
A cam part (1) is provided for a variable sliding cam valve drive of an internal combustion engine, which cam part (1) can be mounted on a basic shaft of the sliding cam valve drive fixedly so as to rotate with it but axially displaceably, and has one or more cam groups (2, 3) and at least one connecting link piece (4) with at least one spiral groove (5) for an actuator pin engagement. At least one weight-reducing groove (7) which does not coincide with the spiral groove (5) is formed on the outer casing (6) of the cam part (1).
Abstract:
The present engine design can comprise one or more three-cylinder modules. Each module can comprise a left-hand combustion cylinder, a compression cylinder and a right-hand combustion cylinder. In an embodiment, the compression cylinder can function as a supercharger providing compressed air to the two combustion cylinders in order to improve performance and efficiency. Each module can comprise a specialized cylinder head comprising an intake air plenum configured to allow pressurized air to flow from the compression cylinder into each of the combustion cylinders. The flow of this pressurized air can be precisely controlled by valves that control airflow into and out of each of the three cylinders. Variable valve timing and computer controls can determine the exact amount of fuel, if any, which will be injected into the combustion cylinders to deliver high fuel economy while delivering an optimal level of power, horsepower and torque.
Abstract:
A valve lift adjustment arrangement for a mechanically-controllable valve drive arrangement includes a bearing shaft, a first roller, a second roller arranged on the bearing shaft, a camshaft arrangement, a valve lift adjustment device comprising a rotatable eccentric shaft, an intermediate lever arrangement, and a device. The intermediate lever arrangement comprises an intermediate lever with a working curve. The intermediate lever is mounted via the first roller to be movable in a slotted-guide track and to be operatively connected to the camshaft arrangement and to the valve lift adjustment device. The device is configured so that the second roller is eccentrically mounted. The device comprises a tool engagement point which aligns the second roller and thereby the intermediate lever arrangement. The camshaft arrangement acts, via the first roller, on the intermediate lever arrangement. The rotatable eccentric shaft is acts, via the second roller, on the intermediate lever arrangement.