摘要:
A valve timing control apparatus for an internal combustion engine includes: a drive rotation member; a housing; a vane rotor; and a front plate, the drive rotation member including a positioning mechanism including a guide portion which is formed on an inner circumference surface of the cylindrical wall, and which has an inclined shape whose an inside diameter is decreased from the one axial end side to the other axial end side, a mounting protrusion portion which is formed on the other end side of the guide portion, and on which an outer circumference surface of the housing is mounted to be positioned.
摘要:
An apparatus improves rotation of a rotatable shaft. The rotatable shaft has a cyclical cogging torque acting thereon in a first direction. The apparatus includes a support member, first and second anti-cogging members, a cam surface and an abutment member. The support member is adjacent the rotatable shaft. The rotatable shaft is operable to rotate relative to the support member. The second anti-cogging member is coupled to the rotatable shaft for rotation with the rotatable shaft. The cam surface is included on one of the first anti-cogging member and the second anti-cogging member. The abutment member is coupled to the other one of the first anti-cogging member and the second anti-cogging member. The abutment member is operable to abut against the cam surface to provide an anti-cogging torque to the rotatable shaft in a second direction that opposes the first direction to at least partially offset the cogging torque.
摘要:
An electrical camshaft phaser arrangement for controllably varying the phase relationship between a crankshaft and a camshaft in an internal combustion engine includes an adjusting gear drive unit formed as a three shafts transmission having a drive shaft connected with the crankshaft, an output shaft connected with the camshaft, and an adjusting shaft connected with the control shaft of an electrical machine. The electrical machine allows phasing the camshaft with regards to the crankshaft by increasing or decreasing control shaft speed, the control shaft being spinning during phase holding modes. The adjusting gear drive unit is configured such that an energy recovering mode is provided wherein a braking torque is applied to the control shaft in order to generate electrical energy.
摘要:
A high-pressure pump (8) for providing a pressurized supply of fuel in an engine furnished with a common rail type fuel injection apparatus is provided with two actuators (88, 89). Of these actuators (88, 89), one (88) is stopped and the operation for providing a pressurized supply of fuel is performed from only the other actuator (89), so that the timing at which the load torque that acts on the crankshaft of the engine becomes a local maximum and the timing at which the load torque that acts on the driveshaft of the high-pressure pump (8) becomes a local minimum are made to coincide with one another.
摘要:
A standard cam phasing OCV may be employed as a virtual check valve to choke the backflow of oil during negative cam torque conditions, including execution of a duty cycle command in an event-based manner. Normally, OCV duty cycle commands are made on a time basis, but for VCV the duty cycle output change must be synchronized with engine events. A method is disclosed for calculating and delivering the VCV duty cycle so that both time-based and event-based controls are maintained and work together. Phase alignment of response time of the OCV solenoid is based upon cam target wheel edges and is event-based. An initial phase rate vs. phase angle is monitored by the Engine Control Module (ECM). Adjustment of the phase angle is provided to achieve maximum cam position phase rate.
摘要:
A system for continuously varying actuation of a valve in an internal combustion engine including a first cam for opening the valve, a second cam for closing the valve, and an oscillating rocker arm continuously engaging each of the first cam, the second cam, and the valvetrain, with the aid of a lost motion spring. The cams are disposed on first and second camshafts that are geared together. The first camshaft gear is driven by the engine crankshaft and thus is phase-invariant. The second camshaft gear is rotationally mounted on the second camshaft and supports the stator of a camshaft phaser. The phaser rotor is mounted to the second camshaft. Varying the rotor position varies the phase of the second cam and thus varies lift and closing timing of the valve. The system is useful in improving the performance of both spark-ignited and compression-ignited engines.
摘要:
An electrical camshaft phaser arrangement for controllably varying the phase relationship between a crankshaft and a camshaft in an internal combustion engine includes an adjusting gear drive unit formed as a three shafts transmission having a drive shaft connected with the crankshaft, an output shaft connected with the camshaft, and an adjusting shaft connected with the control shaft of an electrical machine. The electrical machine allows phasing the camshaft with regards to the crankshaft by increasing or decreasing control shaft speed, the control shaft being spinning during phase holding modes. The adjusting gear drive unit is configured such that an energy recovering mode is provided wherein a braking torque is applied to the control shaft in order to generate electrical energy.
摘要:
A variable valve device for an internal combustion engine includes a cam phase variable mechanism for varying a phase difference (split) between first and second intake cams. Under predetermined operating conditions of the internal combustion engine, the second intake cam is controlled to take a phase (split) (S1) which is within a predetermined pumping-loss reduction operation phase range and entails a minimum fluctuation (oscillation width) of drive torque on an intake camshaft.
摘要:
A standard cam phasing OCV may be employed as a virtual check valve to choke the backflow of oil during negative cam torque conditions, including execution of a duty cycle command in an event-based manner. Normally, OCV duty cycle commands are made on a time basis, but for VCV the duty cycle output change must be synchronized with engine events. A method is disclosed for calculating and delivering the VCV duty cycle so that both time-based and event-based controls are maintained and work together. Phase alignment of response time of the OCV solenoid is based upon cam target wheel edges and is event-based. An initial phase rate vs. phase angle is monitored by the Engine Control Module (ECM). Adjustment of the phase angle is provided to achieve maximum cam position phase rate.
摘要:
Systems and methods for managing camshaft dynamic loads associated with actuation of a camshaft-driven auxiliary device in a multiple-cylinder internal combustion engine apply positive and negative torque to the camshaft in a phased relationship relative to actuation of the auxiliary device and optionally relative to actuation of intake or exhaust valves operated by the camshaft.