Systems and methods for cam profile switch (CPS) assembly
AssigneeFord Global Technologies, LLC
InventorsXiaogang Zhang, Steven Wooldridge
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for actuating an advanced cam profile switch (CPS) assembly. In one example, a system may include a first cylinder and a second cylinder of the CPS assembly that may be independently coupleable to a valve stem via two separate locking mechanisms. A first cam may be selectively engage with the first cylinder and the valve stem and a second cam may be selectively engaged with the second cylinder and the valve stem.
Claims17
A system for a cam profile switch (CPS) assembly, the system comprising:
- a first tappet cylinder;
- a second tappet cylinders;
- a first cam configured to engage the first tappet cylinder;
- a second cam configured to engage a second tappet cylinder;
- a first locking mechanism configured to selectively and independently couple the second tappet cylinder to a valve stem;
- and
- a second locking mechanism configured to selectively and independently couple the first tappet cylinder to the valve stein, wherein the first locking mechanism includes a first spring lock configured to slide along a first opening in the valve stem and a third through hole in the second tappet cylinder, and wherein the second locking mechanism includes a second spring lock configured to slide along a second opening in the valve stem and a second through hole in the first tappet cylinder.
A method for operating a cam profile switch (CPS) assembly including a first tappet cylinder and a second tappet cylinder, the method comprising:
- during a first condition, operating the CPS assembly in a first mode in which the first tappet cylinder is decoupled from a valve stem, the second tappet cylinder is coupled to the valve stem, and a second cam is active;
- and
- during a second condition, operating the CPS assembly in a second mode in which the first tappet cylinder is coupled to the valve stem, the second tappet cylinder is decoupled from the valve stem, and a first cam is active.
A system for an engine, the system comprising:
- an engine combustion chamber including at least one valve configured to open via a valve stem selectively actuated via two or more cam lobes coupled to a camshaft;
- a cam profile switch (CPS) assembly including a first tappet cylinder and a second tappet cylinder concentrically arranged with respect to the valve stem such that the first tappet cylinder encircles the second tappet cylinder, and the second tappet cylinder encircles the valve stem;
- a first locking mechanism configured to selectively and independently couple the second tappet cylinder to the valve stem;
- and
- a second locking mechanism configured to selectively and independently couple the first tappet cylinder to the valve stem,
- wherein the first locking mechanism includes a first actuator axle configured to slide along a first through hole in the first tappet cylinder, and a first spring lock configured to slide along a first opening in the valve stem and a third through hole in the second tappet cylinder, and
- wherein the second locking mechanism includes a second actuator axle configured to slide along a second through hole in the second tappet cylinder, and a second spring lock configured to slide along a second opening in the valve stem and the second through hole.
Dependencies are inferred from the claim text.