Abstract: A locking device is provided to lock the phaser vane and sprocket together at all times except when the phaser is moving from position to position. The locking device ensures that the phaser is locked for start conditions and ensures the prevention of noise from being generated. The locking device also ensures that the timing accuracy of the phaser is controlled at a number of positions for the steady state condition.

Abstract: A system and a method to control torque during a mode transition in an internal combustion engine with a fully variable intake valve is disclosed. The mode transition may be a change in the number of active cylinders in a variable displacement engine, a change in compression ratio in a variable compression ratio engine, a gear change in a transmission coupled to the engine, a traction control event, and a rapid change in driver demand.

Abstract: A variable camshaft timing apparatus (10) includes a pulse actuating circuit (24A,50,44,56,60,24R and 24R,52,46,54,58,24A) for oscillating the variable camshaft timing apparatus in reaction to fluid under pulsation, and includes a pressure actuating circuit (30,34,36,40,44,50,24A,24R,52,46,66,80/180,32 and 30,34,38,42,46,52,24R,24A,50,44,64,80/180,32) for oscillating the variable camshaft timing device in reaction to fluid under pressure. Advance and retard valves (44,46) are interconnected with the pulse and pressure actuating circuits for independently and simultaneously activating the pulse and pressure actuating circuits. Finally, an exhaust valve (80,180, 280) is positioned in fluid communication with the pulse and pressure actuating circuits, such that the variable camshaft timing device may be oscillated using one or both of the pulse actuating and pressure actuating circuits, and may be maintained in position using one or both of the pulse actuating and pressure actuating circuits.

Abstract: An oil pressure control apparatus which includes a source of hydraulic pressure introducing the hydraulic pressure to a hydraulic actuator which is actuated by hydraulic pressure, a fluid passage which is connected between the source of hydraulic pressure and the hydraulic actuator for introducing and discharging hydraulic pressure from the source of hydraulic pressure to the actuator, a control valve which is disposed in the fluid passages for controlling the hydraulic pressure and a filter is disposed in a position that is between the actuator and the control valve. Thereby, the control valve is capable to be operated smoothly.

Abstract: In apparatus and method for calculating an internal cylinder intake-air quantity for a variable valve timing controlled engine, an air quantity flowing into the intake manifold from an output of an airflow meter is calculated, the airflow meter being installed in an upstream portion of an intake manifold with respect to an intake valve whose at lease closure timing is variably controlled, a cylinder volume of a corresponding cylinder of the engine is calculated, an income and outgo of an air quantity flowing into the intake manifold and a cylinder intake-air quantity flowing from the intake manifold into the corresponding cylinder is calculated to derive an air quantity in the intake manifold, the internal cylinder intake-air quantity is calculated on the basis of the air quantity of the intake manifold and the cylinder volume, and the calculated cylinder volume is corrected on the basis of at least valve closure timing of the intake valve.