Additive storage tank for a washing machine

1. A washing appliance, comprising:

a casing;

a tub disposed within said casing, the tub including a basket configured for receipt of articles to be washed; and

a vertically oriented additive storage tank disposed between said casing and said tub, said storage tank having a volume for receipt of additive that is formed from

a first vertical storage component disposed at a first location between said casing and said tub,

a second vertical storage component disposed at a second location between said casing and said tub spaced from said first location, and

a bottom transversely extending storage component that extends between said first and second vertical storage components below said tub.

2. The appliance as in claim 1 , wherein said casing is a box-shaped component and said tub is a cylindrical-shaped component, said first vertical storage component disposed in a first corner location of said casing and said second vertical storage component disposed in a second corner location of said casing, said bottom storage component extending along a side wall of said casing between said first and second corner locations.

3. The appliance as in claim 2 , wherein said storage tank has a generally U-shaped or V-shaped configuration.

4. The appliance as in claim 3 , wherein said storage tank comprises a tubular member.

5. The appliance as in claim 4 , wherein said tubular member is non-rigid and bendable.

6. The appliance as in claim 1 , wherein said bottom storage component comprises a port in communication with an external pump line for drawing additive from said storage tank.

7. The appliance as in claim 1 , further comprising an internal pump line that extends through either of said first or second vertical storage compartments into said bottom storage compartment for drawing additive from said storage tank.

8. The appliance as in claim 1 , further comprising a level sensor configured with said storage tank, said level sensor comprising a tube that extends through either of said first or second vertical storage compartments, and a pressure sensor in communication with an external end of said tube, said tube generating a varying internal air pressure as a function of the level of liquid within said storage tank, said pressure sensor detecting said internal air pressure and producing a corresponding liquid level indication.

9. The appliance as in claim 8 , wherein said tube has an open end such that liquid additive in said storage tank enters said tube and varies the internal air pressure in the tube as a function of the amount of liquid in said storage tank.

10. The appliance as in claim 8 , wherein said tube has a closed end and is compressible by the liquid additive within said storage tank such that the internal air pressure in the tube varies as a function of the compression force of the liquid additive.

11. The appliance as in claim 10 , wherein said closed end of said tube extends proximate to said low point of said bottom storage compartment.

12. The appliance as in claim 10 , wherein said closed end of said tube extends through said bottom storage compartment and into the opposite said vertical storage compartment.

13. The appliance as in claim 8 , further comprising a pump and a controller, said controller in communication with said pump and said pressure sensor for controlling said pump to deliver a metered amount of the liquid additive from said storage tank to said tub determined by a measured pressure change detected by said pressure sensor.