Abstract:
A momentary diagnostic for determining correct operation of a cam profile switching system of an internal combustion engine by calculation of changes in cylinder bank to bank air mass flow ratios: operating said engine in one condition of the cam profile switching system; providing for a first cylinder subset the inlet fuel flow and the corresponding oxygen content of the exhaust flow, and calculating the mass of air passing through the first cylinder subset in a defined time period; providing for a second cylinder subset the inlet fuel flow and the corresponding oxygen content of the exhaust flow; calculating the mass of air passing through the second cylinder subset in said defined time period; comparing the mass air flow the oxygen content for the first and second cylinder subsets to give a standard ratio; momentarily forcing the cam profile switching system of one of said cylinder subsets to an alternative condition; re-calculating providing the corresponding mass of air oxygen content passing through the first and second cylinder subsets; and comparing said recalculated air flows oxygen contents to give a revised ratio; and comparing said standard ratio and revised ratio.
Abstract:
An electro-hydraulic variable valve lift apparatus may include a housing, a master portion which is slidably disposed to the housing and contacts a cam, a first oil supply portion which supplies hydraulic pressure, a slave piston which is slidably disposed within the housing and defines an oil chamber with the master portion, a latching portion which is supplied the hydraulic pressure from the first oil supply portion and selectively connects the slave piston and the master portion, a second oil supply portion which selectively supplies hydraulic pressure to the oil chamber so as to control relative distances between the master portion and the slave piston when the slave piston is disengaged with the master portion, and a stepped portion formed to the housing between the master portion and the slave piston to elastically support the master portion.
Abstract:
A mechanical bucket tappet (1) for a valve driver of an internal combustion engine having a hollow cylinder-shaped wall (2) which is delimited at one frontal area (3) by a disk-like bottom (4) whose top side (5) is provided as a cam stop face and which comprises a central, funnel-like recess (6), wherein a dome-like one-piece catch (8) aligned with the recess (6) projects from a lower side (7) of the bottom (4), the underside (9) of said catch being used for putting on a valve stem and wherein the funnel-like recess (6) is sealed near or at the top side (5) of the bottom (4), so that the bottom (4) comprises a central encasement (10).
Abstract:
In an engine equipped with a variable valvetrain including a second cam phase alteration mechanism 31 for altering the phase of second intake cams 12 actuating second intake valves, relative to a crankshaft, the second cam phase alteration mechanism 31 is arranged at an end opposite to an end at which a cam sprocket is provided to receive power from the crankshaft, to be located outside a cylinder head 2, and an actuator cover 40 is fixed to the cylinder head 2 to cover at least a lower portion of the second cam phase alteration mechanism 31.
Abstract:
A direct acting CDA device may include an outer body glidingly contacting a cam and moving up and down, an hollow upper seat located in the outer body and restricted to the movement of the outer body, an oil passage formed between the outer body and the upper seat, a latching device insertion hole formed in a transverse direction in the oil passage, an hollow inner body located in the upper seat, latching devices inserted in the latching device insertion hole and selectively restricting the movement of the inner body to the movement of the outer body by selective oil supply, and a lost motion spring located in the hollow spaces of the upper seat and the inner body, supported by the inner body and providing the outer body with an elastic force so that the outer body can selectively take a lost motion.
Abstract:
Featured is a rollerized camshaft support to rotatably support a camshaft of a Type I valvetrain, the camshaft having at least one rotating surface. Such a rollerized camshaft support includes at least one rollerized bearing and at least one bearing support for each of the rollerized bearings, where each bearing support includes a bearing upper support element and bearing lower support element. Each rollerized bearing includes an inner raceway; an outer raceway and a plurality of rolling elements disposed between the inner and outer raceways and extending widthwise across the raceways. The bearing upper support element and bearing lower support element are configured so as to receive there between a rollerized bearing. Also, the bearing lower support element is configured and arranged so to complement a portion of a configuration of the Type I valve train.
Abstract:
An engine control apparatus is provided with an engine, an ignition device, a valve timing changing mechanism, an intake valve close timing detecting device, a supercharger and a controller. The engine achieves a Miller cycle by the valve timing changing mechanism setting an intake valve close timing to occur after a bottom dead center timing. The controller controls an ignition timing of the ignition device, the open timing of the intake valve and the close timing of the intake valve. The controller retards the ignition timing during supercharging and when a detected value of the intake valve close timing is earlier than a target value of the intake valve close timing by at least a prescribed value in comparison with a situation in which the detected value matches the target value of the intake valve close timing.
Abstract:
A valve lifter guide mountable in the engine block of an internal combustion engine, the valve lifter guide comprising at least one elongated socket defining a longitudinal axis, the at least one socket dimensioned to receive a valve lifter therein, and at least one tab projecting away from the valve lifter guide along an axis which is non-parallel to the longitudinal axis of the at least one socket. The at least one tab includes a projection thereon which is dimensioned to be received in an opening provided in the engine block. The tab further defines a surface, oriented in a plane generally perpendicular to the orientation of the projection, which is capturable between the engine block and cylinder head.
Abstract:
A power unit for a small-sized vehicle that includes a valve operating system equipped with a hydraulic valve operation mode change mechanism capable of changing the operational mode of an engine valve, and a clutch device disposed between a crankshaft and a shift mechanism so as to switch hydraulically between connection and disconnection of power transmission, wherein a discharge outlet of one oil pump (209) driven by power transmission from the crankshaft is connected in common to a valve operation mode change mechanisms (63, 64) and a clutch device (102). This enables the hydraulic system to be made compact while avoiding any increase in the overall bulk of the power unit, thus providing a power unit suitable for a small-sized vehicle.
Abstract:
The invention proposes a switchable tappet (1) of a valve train of an internal combustion engine, said tappet comprising a hollow cylindrical housing (3) comprising a bottom (2), an inner element (5) being guided for relative axial displacement in a bore (4) of the housing (3), an at least indirect support for a gas exchange valve extending on a cam-distal front end (6) of the inner element (5), two diametrically opposing pistons as coupling elements (8) being arranged in a radial bore (7) of the inner element (5), which coupling elements (8), for effecting coupling [full valve lift], can be displaced partly beyond a parting surface (9) between the housing (3) and the inner element (5) into an entraining surface (12) of the housing (3) by the force of a compression spring (10a) clamped between inner front ends (10) of the coupling elements (8), wherein the entraining surface (12) is an direct constituent of a separate annular member (13) that is fixed in a cam-distal region of the bore (4) of the housing (3), wherein only one compression spring as a lost motion spring means (16) extends in a cylindrical hollow space (15) formed between an underside (14) of the bottom (2) of the housing (3) and a cam-side flat front end (14a) of the inner element (5), and wherein the inner element (5) is substantially disk-shaped and the parting surface (9) between the housing (3) and the inner element (5) does not comprise any vertical stop means.