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A strategy and control system for a variable displacement engine in which cylinder deactivation is obtained by intake cam phasing and exhaust valve deactivation. Fuel control for the engine and spark deactivation are sequenced with valve deactivation to avoid transferring engine exhaust gases to the

A strategy and control system for a variable displacement engine in which cylinder deactivation is obtained by intake cam phasing and exhaust valve deactivation. Fuel control for the engine and spark deactivation are sequenced with valve deactivation to avoid transferring engine exhaust gases to the intake manifold of the engine during a transition between full cylinder operation and partial cylinder operation. Excess air flow through the exhaust system for the engine is avoided during a transition from partial cylinder operation to full cylinder operation. These features achieve stable engine performance during the transition.

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A strategy and control system for a variable displacement engine in which cylinder deactivation is obtained by intake cam phasing and exhaust valve deactivation. Fuel control for the engine and spark deactivation are sequenced with valve deactivation to avoid transferring engine exhaust gases to the

A strategy and control system for a variable displacement engine in which cylinder deactivation is obtained by intake cam phasing and exhaust valve deactivation. Fuel control for the engine and spark deactivation are sequenced with valve deactivation to avoid transferring engine exhaust gases to the intake manifold of the engine during a transition between full cylinder operation and partial cylinder operation. Excess air flow through the exhaust system for the engine is avoided during a transition from partial cylinder operation to full cylinder operation. These features achieve stable engine performance during the transition. rib of each pair of support ribs being located adjacent to each other, the ribs in each pair of support ribs being arranged to be coplanar with each other, (D) the planes containing each pair of support ribs being spaced apart from each other, (E) the distal ends of each of the support ribs being located at a first height distance above the second surface of the second layer of said base unit, (F) a pair of rear support ribs, each rear support rib having (i) a proximal end frictionally and releasably mounted in the channel defined in the U-shaped top wall in the set up condition, (ii) a distal end spaced apart from the second surface of the second layer of said base unit, with the distal ends of the rear support ribs being located at a second height distance above the second surface of the second layer of said base unit, with the second height distance being less than the first height distance, (G) the rear support ribs being co-planar with each other, and the plane containing the rear support ribs being spaced apart from a plane containing an adjacent pair of support ribs, (H) a U-shaped entrance support rib having (i) two end legs, with each end leg in the set up condition having a proximal end fictionally and releasably mounted in the channel defined in the U-shaped top wall at a location spaced apart from the proximal end of an adjacent L-shaped support rib in the circumferential direction of the channel defined in the U-shaped top wall and spaced apart in the circumferential direction of the channel defined in the U-shaped top wall from the proximal end of the other end leg of the U-shaped entrance support rib, each end leg further including a distal end which is spaced apart from the distal end of an adjacent L-shaped support rib in the circumferential direction of the channel defined in the U-shaped top wall and which is spaced apart from the distal end of the other end leg of the U-shaped entrance support rib in the circumferential direction of the channel defined in the U-shaped top wall, and (ii) bight leg portions connecting the distal ends of the two end legs of the U-shaped entrance support rib to each other, the bight leg portions of the U-shaped entrance support rib being spaced apart from the second surface of the second layer of said base unit, and (iii) a backbone extending from the U-shaped entrance support rib to the pair of rear support ribs and having a first end connected to the bight leg of the U-shaped entrance support rib and is connected to the pair of rear support ribs; and c) a flexible cover supported on said frame unit and which includes (1) a peripheral edge which has a first portion releasably attached to the second side wall of the circumferential support element of said frame unit in the set up condition and a second portion which is releasably attached to the U-shaped entrance support rib in the set up condition, and (2) a body portion. 2. An animal shelter comprising: a) a base unit which rests on a ground, when in use and which includes a peripheral support element releasably attached to said base unit; b) a frame unit which is releasably attached to said base unit when in use and which includes (1) a plurality of ribs each of which is releasably attached to the peripheral support element of said base unit when in use, (2) a cooling gel contained in each rib; c) a cooling gel contained in the peripheral support element of said base unit; and d) a flexible cover releasably attached to the peripheral support unit when in use. 3. The animal shelter as described in claim 1 further including hook-and-loop fastener material releasably connecting the first side wall of the base of the circumferential support element to the outer peripheries of the first layer and the second layer in the set up condition. 4. The animal shelter as described in claim 3 further including hook-and-loop fastener material releasably connecting the first portion of the peripheral edge of said flexible cover to the second side wall of the circumferential support element of said frame unit in the set up condition. 5. The animal shelter as described in claim 3 further including hook-and-loop fastener material releasably connecting the second portion of the peripheral edge of said flexible cover to the U-shaped entrance support rib in the set up condition. 6. The animal shelter as described in claim 5 further including hook-and-loop fastener material releasably connecting the proximal end of each L-shaped support rib to the U-shaped top wall of the circumferential support element of said frame unit in the set up condition. 7. The animal shelter as described in claim 6 further including hook-and-loop fastener material releasably connecting the flexible cover to the backbone of the support skeleton unit. 8. The animal shelter as described in claim 7 wherein the backbone of said frame unit includes a hollow bore defined between the first end of the backbone and a second end of the backbone and further includes a cooling gel in the hollow bore of the backbone. and out of the chamber. 11. The plasma processing chamber as in claim 1, wherein the passage door in a closed position is located with a gap of several ten thousandths of an inch from a surface adjacent an opening of the substrate transfer passage at the chamber liner. 12. The plasma processing chamber as in claim 8, wherein the limit of the movement of the passage door in a vertical direction is precisely set by at least one soft stop. 13. The plasma processing chamber as in claim 2, wherein the passage door has a top portion and a bottom portion, the top and bottom portions of the passage door being beveled to match a bevel of opposed surfaces of the chamber liner that the top and bottom portions face. 14. The plasma processing chamber as in claim 13, wherein a center portion of the passage door is beveled to match an angled surface of a portion of a surface of the chamber liner through which the substrate transfer passage extends. 15. A substrate processing chamber for use with a sealing door, and enclosing a substrate processing location space, the chamber comprising: a hollow chamber body having an exterior surface and an interior surface, the interior surface defining the substrate processing location space, wherein a substrate transfer passage extends through the chamber body from the exterior surface to the interior surface, the substrate transfer passage being sized to pass a substrate therethrough; a door seat disposed where the substrate transfer passage terminates at the exterior surface of the hollow chamber body, the door seat being configured to cooperate with the sealing door to selectively seal said substrate transfer passage; and a passage door disposed inside the hollow chamber body, adjacent to the substrate transfer passage, and being moveable so as to selectively block the substrate transfer passage; wherein the passage door is moveable in a vertical direction and is selectively controlled through movement of a bellows assembly via which a support for said door is provided; wherein the passage door is supported by two or more support rods; and wherein a first of the two or more support rods is fixed to the passage door via a tightly clamped connection, wherein a second of the two or more support rods is connected to the passage door via a floating connection while maintaining the orientation of the passage door in a vertical direction and in a direction approximately perpendicular to a long axis of the passage door, the floating connection permitting the second support rod to move with respect to the passage door in a direction approximately along the long axis of the passage door. 16. A liner assembly for use in a plasma processing chamber th at confines a substrate processing plasma envelope and has a substrate transfer passage sized to permit movement into and out of the chamber of a substrate to be processed, the liner assembly comprising: a liner adapted to line the interior surface of the plasma processing chamber to confine the substrate plasma processing envelope and protect interior surfaces of the chamber from deposition of materials from the plasma, wherein the substrate transfer passage passes through the liner, and an inner slit passage door selectively movable from an open position to a closed position between the interior surface of the plasma processing chamber and the liner, wherein the open position permits the substrate to be processed to pass through the substrate transfer passage, and wherein in the closed position the inner slit passage door blocks the substrate transfer passage. 17. The liner assembly as in claim 16, wherein the liner is curved and the inner slit passage door is curved to match the configuration of the curved liner. 18. The liner assembly as in claim 16, where a movement of the door is vertical and is selectively controlled via a bellows assembly. 19. The liner assembly as in claim 16, wherein the inner slit passage door when positioned to block th e substrate transfer passage extends beyond the edges of an opening in the liner by an overlap distance. 20. The liner assembly as in claim 19, wherein the overlap distance is at least 1/4 inch (6.35 mm). 21. The liner assembly as in claim 19, wherein the overlap distance is approximately 1/2 inch (12.7 mm). 22. The liner assembly as in claim 16, wherein the inner slit passage door is supported by two support rods. 23. The liner assembly as in claim 16, wherein when an outer slit valve door of the chamber opens, the inner slit passage door opens substantially simultaneously therewith to allow passage of the substrate in to and out of the chamber. 24. The liner assembly as in claim 16, wherein the inner slit passage door in a closed position is located with a gap of several ten thousandths of an inch from a surface of the liner adjacent the substrate transfer passage. 25. The liner assembly as in claim 16, wherein the limit of the movement of the inner slit passage door in a vertical direction is precisely set by at least one soft stop. 26. The liner assembly as in claim 16, wherein top and bottom portions of the inner slit passage door are beveled to match opposed portions of a portion of a surface of the liner that they face. 27. The liner assembly as in claim 16, wherein a center portion of the inner slit passage door is beveled to match an angled surface of a portion of a surface of the liner through which the substrate transfer passage extends. 28. A liner assembly for use in a substrate vacuum processing chamber having a substrate processing location therein, the liner assembly comprising: a liner sized to surround the substrate processing location in the vacuum processing chamber, wherein the liner has a substrate transfer opening disposed therethrough, and a liner door selectively movable from an open position to a closed position, wherein the open position permits a substrate to be processed to pass through the substrate transfer opening, wherein in the closed position the liner door is positioned in close proximity to but not touching the liner all around the substrate transfer opening, wherein in the closed position the liner door blocks the substrate transfer opening, wherein in the closed position the edges of the liner door overlap the edge of the substrate transfer opening; wherein the liner door is supported by two support rods; and where a first of the two support rods is fixed to the liner door through a tightly clamped connection, while a second of the two support rods is connected to the liner door through a floating connection which maintains the liner door's orientation in a vertical direction and in a direction approximately perpendicular to a long axis of the liner door, and is free to move in a direction approximately along the long axis of the liner door. 29. A plasma processing chamber confining a substrate processing plasma envelope, the chamber being connected to a substrate transfer chamber having an outer slit valve door, the chamber comprising: a chamber body enclosing a substrate processing location space, the chamber body including a substrate transfer passage extending from the outer slit valve door to the substrate processing location space, the substrate transfer passage being sized to pass a substrate therethrough; a chamber liner lining the interior surface of the chamber body to enclose the substrate processing location space, confine the substrate plasma processing envelope, and protect the interior surface from deposition of materials from the plasma, wherein the substrate transfer passage extends through the chamber liner, and wherein the chamber liner has a door recess formed therein; and an inner slit passage door disposed in the door recess to selectively block the substrate transfer passage at the chamber liner. 30. A plasma processing chamber for use with an outer slit valve door, and enclosing a substrate processing location space, the chamber comprising: a