Abstract:
In a variable valve system for an internal combustion engine and its driving mechanism, the variable valve system comprises: a variable mechanism that revolves a control axle to change an operation characteristic of an engine valve; a projection section projected at an outer peripheral predetermined position in an axial direction of the control axle and on a tip of which a fixture section is formed; a fixture member fixed in a grasped state for the projection member via an engagement member engaged on the fixture section; a driving mechanism configured to provide a rotating force for the control axle via the fixture member; and control means (a control section) for controlling the driving mechanism in accordance with a driving state of the engine.
Abstract:
A method for calibrating a distance sensor of a rotary actuator device for controlling a charge cycle valve of an internal combustion engine. The rotary actuator device includes a controllable electric motor having an actuator element for actuating the charge cycle valve, two energy storage means acting in opposite drive directions on the charge cycle valve, a control and regulating device which controls the electric motor with regard to its rotor angle according to a stored setpoint path and a distance sensor for detecting the rotor position. At least one state variable of the electric motor is measured, the at least one state variable being compared with a reference variable. If there is a deviation between the variables being compared, the stored setpoint path and/or the distance sensor signal detected is/are altered as a function of the state variable.
Abstract:
An actuator for a valve lift control device linearly moves a control shaft to change a valve lift in accordance with an axial position of the control shaft. A first and a second rotation cam integrally rotate around a common rotation axis by transmission of torque, so that a direct acting follower, which includes a first and a contact members, linearly moves with a control shaft. The first and a second rotation cams are respectively in contact with the first and the second contact members via a first and a second contact points. The first contact point is located on the opposite side of the second contact point with respect to the rotation axis. A sum of a first rotation cam lift of the first rotation cam and a second rotation cam lift of the second rotation cam is substantially constant in a predetermined rotation angular range of the first rotation cam and the second rotation cam.
Abstract:
The invention relates to an electro-hydraulic valve actuator having a cylinder and an alternating cam and comprising: a valve-actuating hydraulic cylinder (2) which opens a valve of an internal combustion engine (100) using a valve-opening solenoid valve (4), a high-pressure valve-opening duct (11) and a high-pressure inflow hydraulic circuit (5), and which closes said valve using a valve-closing solenoid valve (6), a high-pressure valve-closing duct (12) and a high-pressure outflow circuit (7); and a hydraulic positive displacement pump (8) co-operating with a pump inlet non-return valve (14) and a pump outlet sealing solenoid valve (13), the outlet thereof being connected to a low-pressure circuit (9) and to a low-pressure tank (10) supplied by a replenishment pump (52) and a replenishment tank (53).
Abstract:
The invention concerns a valve drive system for an internal combustion engine, the valve drive system being provided between its at least one lifting valve (12) and its camshaft (34) in order to control the variable lift sequence. The valve drive system comprises a pressure-transmission arrangement which presses against the lifting valve (12), and a contact member (35) which abuts a cam (16) on the camshaft (34) and, as it changes position owing to the rotation of the cam (16), brings about an oscillating movement of the pressure-transmission arrangement. The pressure-transmission arrangement has a contact surface (80) via which pressure is transmitted. The contact surface (80), which can pivot about the bearing axis (14), comprises a first surface region (80.1) which has a circular-cylindrical curvature having the bearing axis (14) as the longitudinal axis of the cylinder, and a second surface region (80.2) which adjoins the first surface region (80.1) and has a non-circular-cylindrical curvature.
Abstract:
A hydraulically operated camshaft phasing mechanism has two lock pins. One of the lock pins engages at an intermediate position and an end lock pin engages near one of the stops at the end of the phaser range of authority. At least one of the locking pins, preferably the end lock pin, when the vane is at an end stop position, is engaged by oil pressure and spring loaded to release when the oil pressure side of the end lock pin is vented.
Abstract:
A torsion assembly for providing controllable torsion to a camshaft, including: a spring assembly including a first spring; and, a contact element arranged to engage at least one lobe for the camshaft. For a locked mode: the contact element is arranged to be displaced by the at least one cam lobe; the contact element is arranged to compress the first spring; and the first spring is arranged to impart a first torque to the camshaft via the contact element. For an unlocked mode, the contact element is arranged to be displaced by the at least one cam lobe and the contact element is arranged to impart a second torque, less than the first torque, to the cam shaft via the contact element.
Abstract:
A hydraulically operated camshaft phasing mechanism has two lock pins. One of the lock pins engages at an intermediate position and an end lock pin engages near one of the stops at the end of the phaser range of authority. At least one of the locking pins, preferably the end lock pin, when the vane is at an end stop position, is engaged by oil pressure and spring loaded to release when the oil pressure side of the end lock pin is vented.
Abstract:
A variable valve system of an internal combustion engine includes a first mechanism that varies an operation angle of an intake valve in accordance with a conversion actuation force applied thereto and a second mechanism that varies an operation angle of an exhaust valve in accordance with the conversion actuation force applied thereto, wherein the first and second mechanisms force mechanically the intake and exhaust valves to take smaller and larger operation angles respectively when the conversion actuation forces are not applied to the first and second mechanisms respectively.
Abstract:
An electrohydraulic valve actuator with cylinder and reciprocating cam includes: a valve-actuating hydraulic cylinder (2) which opens a valve of an internal combustion engine (100) via a valve-opening solenoid valve (4), a valve-opening high-pressure duct (11), and an incoming high-pressure hydraulic circuit (5), and which closes the valve via a valve-closing solenoid valve (6), a valve-closing high-pressure duct (12) and an outgoing high-pressure circuit (7), a hydraulic positive displacement pump (8) cooperating with a pump non-return valve (14) and a pump outlet sealing solenoid valve (13) and the outlet of which is connected to a low-pressure circuit (9) and to a low-pressure reservoir (10) supplied by a replenishing pump (52) and a replenishing reservoir (53).