1. A downhole tool for collecting and retrieving junk from a well bore, the tool comprising: a cylindrical body attachable in a work string; a multi-faceted surface comprising a plurality of projections arranged at an end of the body for contacting with and breaking up junk; and a plurality of inlet ports through which the broken up junk passes into a trap for collection, wherein each projection is located between adjacent inlet ports.
2. A downhole tool as claimed in claim 1 wherein the projections each include a plurality of tungsten carbide coated surfaces.
3. A downhole tool as claimed in claim 1 wherein the tool further includes a sleeve located around the body, the sleeve including filter means for filtering debris from fluid passing there through.
4. A downhole tool as claimed in claim 3 wherein a trap is provided in an annular space between the body and the sleeve.
5. A downhole tool as claimed in claim 1 wherein the ports have a flow path parallel to a longitudinal axis of the tool.
6. A downhole tool as claimed in claim 1 wherein each inlet port includes a valve.
7. A downhole tool as claimed in claim 3 wherein the tool includes a throat, the throat being located adjacent to the projections and having a diameter narrower than a diameter of the sleeve.
8. A downhole tool as claimed in claim 1 wherein the cylindrical body includes an axial bore to permit fluid flow through the work string.
9. A downhole tool as claimed in claim 7 wherein the tool includes one or more milling elements located adjacent the throat and distal to the inlet ports.
10. A method of collecting and retrieving junk within a well bore, comprising the steps:
a) providing a multi-faceted contact surface on a work string, the surface including a plurality of projections and a plurality of inlet ports, each projection being located between adjacent inlet ports;
b) breaking up large pieces of junk by contact with the surface;
c) collecting the broken-up junk through the inlet ports; and
d) storing the broken-up junk in a trap adjacent the inlet ports.
11. A method as claimed in claim 10 wherein the method includes the steps of providing a mill ahead of the surface and jetting milled junk from the mill towards the inlet ports.
12. A method as claimed in claim 10 wherein the method includes the step of operating one or more valves at each inlet port to prevent the broken-up junk from exiting the trap.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1-25. (canceled)
26. A method to adjust timing of an electrically actuated valve, said electrically actuated valve operating in a cylinder of an internal combustion engine, the method comprising:
during a cycle of said cylinder, opening said electrically actuated valve at a first valve opening position without activating a valve opening coil, and closing the valve at a first closing position; and
during a second subsequent cycle of said cylinder, opening said electrically actuated valve at a second opening position that is varied based on the crankshaft angle at which said first closing occurs, where the second opening position is increased as said the crankshaft angle at which the first closing occurs increases.
27. The method of claim 26 wherein said first closing position is determined from a signal of a sensor.
28. The method of claim 26 wherein between said first opening and first closing said electrically actuated valve, a valve closing electromagnet is de-energized and then energized after a integral number of oscillations of a valve armature between said valve closing electromagnet and a valve opening electromagnet.
29. The method of claim 26 further comprising varying of said second opening position of said electrically actuated valve in response to a sensor signal.
30. The method of claim 29 wherein said sensor signal is indicative of a cylinder air charge amount.
31. The method of claim 26 wherein said electrically actuated valve is an intake valve.
32. The method of claim 26 wherein said electrically actuated valve is an exhaust valve.
33. The method of claim 26 wherein between said first opening and first closing said electrically actuated valve, a closing coil repels then attracts an actuator armature that acts on said electrically actuated valve.
34. A method to adjust timing of an electrically actuated valve, said electrically actuated valve operating in a cylinder of an internal combustion engine, the method comprising:
operating a closing coil of said electrically actuated valve when said electrically actuated valve is in a substantially closed position;
opening said electrically actuated valve without actuating an opening coil of said electrically actuated valve in a first cylinder cycle;
operating said closing coil after a predetermined period to close said electrically actuated valve at a first position; and
opening said electrically actuated valve during a second cylinder cycle, said second cylinder cycle subsequent to said first cylinder cycle, without actuating an opening coil of said electrically actuated valve, at a position that is based on the crankshaft angle at which said closing occurred, where the position of the opening of the electrically actuated valve during the second cylinder cycle is increased as the crankshaft angle at which said closing occurred is increased.
35. The method of claim 34 wherein said electrically actuated valve is an intake valve.
36. The method of claim 34 wherein said electrically actuated valve is an exhaust valve.
37. The method of claim 34 wherein the opening position of said electrically actuated valve varies based on a sensor signal.
38. The method of claim 16 wherein said sensor signal is indicative of a cylinder air charge amount.
39. The method of claim 37 wherein said operating a closing coil of said electrically actuated valve when said electrically actuated valve is in a substantially closed position acts to allow said electrically actuated valve to move to an open position.
40. The method of claim 37 wherein said operating said closing coil of said electrically actuated valve varies based on said sensor signal.
41. A computer readable storage medium having stored data representing instructions executable by a computer to control an electrically actuated valve in a cylinder of an internal combustion engine of a vehicle, said storage medium comprising:
instructions for opening said electrically actuated valve at a first position and closing said electrically actuated valve at a second position without activating a valve opening coil, during a cycle of said cylinder; and
instructions for opening said electrically actuated valve at a third position based on the crankshaft angle at which said second position occurs and closing said electrically actuated valve at a fourth position during a subsequent cycle of said cylinder, where the third position is increased as the second position increases.