1. A control device for controlling a two-way linear solenoid valve comprising a pressure regulating port which communicates with a hydraulic circuit side, a drain port which communicates with a drain side, a plunger which controls the state of communication between the pressure regulating port and drain port, and a coil which drives the plunger in accordance with an exciting current, the control device comprising:
a current generator which supplies the coil with the exciting current corresponding to a duty signal; and
a microcomputer programmed to:
determine whether or not a preset foreign matter removal starting condition for removing foreign matter accumulated in the ports has been established;
set a variation pattern for a current command value in the form of a rectangular wave having a preset maximum current command value and a preset minimum current command value, when the foreign matter removal starting condition is established, and subsequently transmit to the current generator a first duty signal corresponding to the maximum current command value and a second duty signal corresponding to the minimum current command value;
determine whether or not a preset foreign matter removal completion condition has been established; and
terminate the setting of the rectangular wave variation pattern when the foreign matter removal completion condition is established.
2. The control device as defined in claim 1, wherein the linear solenoid valve comprises a seal member around a drain port side opening portion of the pressure regulating port, to and from which an end face of the plunger is connected and disconnected,
the plunger performing a reciprocal motion in the axial direction thereof according to the setting of the variation pattern of the rectangular wave form current command value, whereby the seal member and the end face of the plunger are connected and disconnected,
the pressure regulating port and the drain port communicating with each other or being blocked from each other in accordance with the connection or disconnection.
3. The control device as defined in claim 2, wherein the maximum current command value is a value at which the end face of the plunger is removed from the seal member by a predetermined amount enabling the removal of foreign matter, and
wherein the minimum current command value is a value at which the end face of the plunger contacts the seal member.
4. The control device as defined in claim 1, wherein the two-way linear solenoid valve is used in a transmission connected to an engine,
the control device comprises means for detecting start-up of the engine, and
the foreign matter removal starting condition is the start-up of the engine.
5. The control device as defined in claim 4, wherein the foreign matter removal completion condition is the elapse of a predetermined amount of time following the start-up of the engine.
6. The control device as defined in claim 4, wherein the control device comprises means for detecting an operating range of the transmission, and
wherein the foreign matter removal completion condition is established when the operating range of the transmission is in a traveling range, in which the transmission outputs a rotation of the engine.
7. The control device as defined in claim 4, wherein the control device comprises a sensor which detects an output rotation speed of the transmission, and
wherein the foreign matter removal completion condition is established when the output rotation speed of the transmission is equal to or greater than a predetermined value.
8. The control device as defined in claim 1, wherein the two-way linear solenoid valve is used in a belt continuously variable transmission connected to the engine,
the control device comprises a sensor which detects a primary pressure acting on a primary pulley of the continuously variable transmission, and
the foreign matter removal starting condition is a reduction in the primary pressure below a target value.
9. The control device as defined in claim 1, wherein the two-way linear solenoid valve is used in a belt continuously variable transmission connected to the engine,
the control device comprises a sensor which detects a secondary pressure acting on a secondary pulley of the continuously variable transmission, and
the foreign matter removal starting condition is a reduction in the secondary pressure below a target value.
10. A control device for controlling a two-way linear solenoid valve comprising a pressure regulating port which communicates with a hydraulic circuit side, a drain port which communicates with a drain side, a plunger which controls the state of communication between the pressure regulating port and drain port, and a coil which drives the plunger in accordance with an exciting current, the control device comprising:
current generating means for supplying the coil with the exciting current corresponding to a duty signal;
determination means for determining whether or not a preset foreign matter removal starting condition for removing foreign matter accumulated in the ports has been established;
setting means for setting a variation pattern for a current command value in the form of a rectangular wave having a preset maximum current command value and a preset minimum current command value, when the foreign matter removal starting condition is established,
transmission means for transmitting to the current generating means a first duty signal corresponding to the maximum current command value and a second duty signal corresponding to the minimum current command value;
determination means for determining whether or not a preset foreign matter removal completion condition has been established; and
termination means for terminating the setting of the rectangular wave variation pattern when the foreign matter removal completion condition is established.
11. A control method for controlling a two-way linear solenoid valve comprising a pressure regulating port which communicates with a hydraulic circuit side, a drain port which communicates with a drain side, a plunger which controls the state of communication between the pressure regulating port and drain port, a current generator which supplies a coil with an exciting current corresponding to a duty signal, and the coil which drives the plunger in accordance with the exciting current, the control method comprising the steps of:
determining whether or not a preset foreign matter removal starting condition for removing foreign matter accumulated in the ports has been established;
setting a variation pattern for a current command value in the form of a rectangular wave having a preset maximum current command value and a preset minimum current command value, when the foreign matter removal starting condition is established, and subsequently transmitting to the current generator a first duty signal corresponding to the maximum current command value and a second duty signal corresponding to the minimum current command value;
determining whether or not a preset foreign matter removal completion condition has been established; and
terminating the setting of the rectangular wave variation pattern when the foreign matter removal completion condition is established.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
I claim:
1. An anti-mine unit for digging up, exposing and exploding mines in a minefield, comprising:
a front beam, a rear beam, and two opposing side beams defining a rectangular frame;
mounting means normal to the rear beam for mounting the rectangular frame to a prime mover so that the frame extends horizontally in front of the prime mover;
a plurality of digging cables suspended from the front beam adapted for digging into a surface of the minefield, each cable being independently suspended;
a plurality of drag cables suspended from the front beam adapted for dragging over the surface of the minefield, each dragging cable being independently suspended;
a plurality of curtain cables suspended from the rear beam and the two opposing side beams;
a first pair of deflector cables and a second pair of deflector cables mounted to opposite ends of the rear beam, respectively, the deflector cables being adapted for deflecting unexploded mines from a path of the prime mover.
2. The anti-mine unit of claim 1, further comprising a top plate affixed to said rectangular frame and covering an opening defined by said rectangular frame, said top plate and said curtain cables minimizing blast damage from mines exploded by the anti-mine unit.
3. The anti-mine unit of claim 2, wherein said top plate has a plurality of holes defined therein adapted for passing a flexible element therethrough for lifting said drag cables..
4. The anti-mine unit of claim 1, wherein each said digging cable further comprises an end cap having a digger blade extending therefrom adapted for penetrating the surface of the minefield attached to an end of the digging cable.
5. The anti-mine unit of claim 4, wherein each said digging cable further comprises a shallow ground engaging blade attached to said end cap about 180 opposite said digger blade.
6. The anti-mine unit of claim 1, wherein each said digging cable comprises a three inch diameter steel cable.
7. The anti-mine unit of claim 6, wherein of said drag cables further comprises a plurality of sleeves disposed thereon, each of said sleeves having a plurality of ground engaging blades extending therefrom adapted for dragging across a minefield and detonating shallow mines..
8. The anti-mine unit of claim 7, wherein each of said drag cables further comprises a grass blade attached to said sleeves adapted for penetrating tall grass.
9. The anti-mine unit of claim 1, wherein each of said drag cables comprises two inch diameter steel cable.
10. The anti-mine unit of claim 1, wherein said curtain cables comprise two inch diameter steel cables spaced five said cables per ten inches of beam.
11. The anti-mine unit of claim 1, wherein further comprising an elongated rod attached to each said side beam, said elongated rod limiting outward rotation of said curtain cables to 70 from vertical.
12. The anti-mine unit of claim 1, wherein said each said deflector cable comprises three inch diameter steel cable.
13. The anti-mine unit of claim 1, wherein each said deflector cable further comprises an end cap having a plow blade attached thereto.
14. The anti-mine unit of claim 13, wherein each said deflector cable is bolted to an adjacent said deflector cable in the pair of deflector cables at the plow blade end of said deflector cables.
15. The anti-mine unit of claim 1, wherein said frame further comprises:
right and left vertical rear beams extending normal to said rear beam and to said opposing side beams;
a lower rear beam extending between said right and left vertical rear beams parallel to said rear beam; and
lower left and right side beams extending diagonally between said front beam and said lower rear beam, the opposing side beams lower right and left side beams, and right and left vertical rear beams defining rigid triangular supports maintaining said front beam in an elevated position.
16. The anti-mine unit of claim 1, further comprising:
a digging cable support beam extending between the two opposing side beams;
a drag cable support beam extending between the two opposing side beams; and
a plurality of lift cables extending between said digging cable support beam and said digging cables, and between said drag cable support beam and said drag cables, for preventing movement of said digging and drag cables forward of said front beam.
17. The anti-mine unit of claim 1, further comprising a plurality of digging cable shackles and a plurality of drag cables shackles attached in alternating fashion to said front beam, said digging cable shackles being radially staggered from said drag cable shackles, one said digging cable being removably attached to each said digging cable shackle, one said digging cable and one said drag cable being removably attached to each said drag cable shackle, whereby said digging cables and said drag cables are easily removed for repair and replacement.
18. The anti-mine unit of claim 1, further comprising a plurality of wire cutters attached to said front beam. 29