Patent application number | Description | Published |
20110048346 | Engine with Hydraulic Variable Valve Timing - In one example, a method is described for an engine with a hydraulically actuated phaser for adjusting cam timing. The phaser is controlled by a hydraulic spool valve, for example, having a de-energized position that results in hydraulic force urging the phaser to a base timing. When it is desired to operate the cam timing at base timing, rather then leave the spool valve in a de-energized position that can generate leakage, the spool valve is adjusted to near a null position to reduce the hydraulic pressure drop across the cam journal and thus reduce oil leakage. In this way, it is possible to maintain base timing, while also reducing leakage. | 03-03-2011 |
20120145098 | Engine with Hydraulic Variable Valve Timing - In one example, a method is described for an engine with a hydraulically actuated phaser for adjusting cam timing. The phaser is controlled by a hydraulic spool valve, for example, having a de-energized position that results in hydraulic force urging the phaser to a base timing. When it is desired to operate the cam timing at base timing, rather then leave the spool valve in a de-energized position that can generate leakage, the spool valve is adjusted to near a null position to reduce the hydraulic pressure drop across the cam journal and thus reduce oil leakage. In this way, it is possible to maintain base timing, while also reducing leakage. | 06-14-2012 |
20140100765 | APPROACH FOR CONTROLLING OPERATION OF OIL INJECTORS - Various embodiments of systems and methods related to controlling oil injection for piston cooling in an engine are disclosed. In one embodiment, a method includes during an engine cold start event, enabling oil injection onto a piston of an engine, disabling oil injection after the engine cold start event, and re-enabling oil injection after the engine cold start event based on a first operating parameter. | 04-10-2014 |
20140123921 | VARIABLE CAM TIMING SYSTEM AND METHOD - A method for operation of an engine is provided. The method includes operating an engine with independent variable intake and exhaust valve timing with an intake valve timing actuator and an exhaust valve timing actuator, locking both the intake and exhaust valve timing actuators in a mid-lock position, and unlocking both the intake and exhaust valve timing actuators via a common locking-control valve. | 05-08-2014 |
20140130754 | VARIABLE CAM TIMING SYSTEM AND METHOD - A phase control apparatus in a variable cam timing (VCT) system of an engine is described herein. The phase control apparatus includes a locking pin coupled to a vane, the locking pin extending into a locking pin recess in a cover plate in a locked configuration, the locking pin and locking pin recess having a backlash and a housing at least partially enclosing the vane and spaced away from the vane forming a gap in the locked configuration. | 05-15-2014 |
20140338617 | CAM PHASER SYSTEM AND METHOD - An engine system is provided. The engine system includes a drive component coupled to a first end of a camshaft and mechanically coupled to a crankshaft and a cam phaser coupled to a second end of the camshaft and mechanically coupled to and spaced away from the drive component, the cam phaser configured to alter the timing of the camshaft. | 11-20-2014 |
20150019106 | METHOD AND SYSTEM FOR AN ENGINE FOR DETECTION AND MITIGATION OF INSUFFICIENT TORQUE - A method comprises in response to an oil pressure below a threshold oil pressure, and an engine speed below a threshold engine speed, restricting cam movement while the vehicle is moving, and during a vehicle stopped condition, overriding the restricted cam movement. | 01-15-2015 |