Patent ID: 8356583
Filing Date: 2013-01-22
Classification: F01L

Abstract:
1. A variable cam timing phaser for an internal combustion engine including a housing assembly with an outer circumference for accepting drive force and a rotor assembly for connection to a camshaft, coaxially located within the housing having a plurality of vanes, wherein the housing assembly and the rotor assembly define at least one chamber separated by a vane into an advance chamber and a retard chamber, the vane within the chamber acting to shift relative angular position of the housing assembly and the rotor assembly, comprising: a piloted valve in the rotor assembly, movable from a first position to a second position, and detent lines communicating with the advance chamber or the retard chamber are restricted and or blocked when the rotor assembly is in or near an intermediate phase angle position; wherein when the piloted valve is in the first position, fluid is blocked from flowing through the piloted valve and wherein when the piloted valve is in a second position, fluid is allowed to flow between the detent line from the advance chamber and the detent line from the retard chamber through the piloted valve and a common line, such that the rotor is moved to and held in the intermediate phase angle position relative to the housing.