Digital brewer control

• US 5,375,508 A
• Filed: 12/29/1993
• Issued: 12/27/1994
• Est. Priority Date: 12/29/1993
• Status: Expired due to Term

• Current Assignee: Bunn-O-Matic Corporation
• Original Assignee: Bunn-O-Matic Corporation
• Inventors: Geockner, Victor D., Knepler, John T.
• Primary Examiner(s): Jenkins, Robert W.
• Application Number:
  US08/174,822
• Time in Patent Office: 363 Days
• Field of Search: 99/279, 99/280, 99/281, 99/282, 99/283, 99/295, 99/299, 99/300, 99/304, 99/305, 99/307, 99/302 R, 426/433, 392/442, 392/449, 392/498, 392/451, 219/483
• US Class Current: 99/280
• CPC Class Codes: A47J 31/0576 with a sealed water boiling vessel in which the steam pressure urges the hot water through a rising pipe with brewing vessel adapted for extraction under pressure A47J31/30
• CPC Class Codes: A47J 31/52 Alarm-clock-controlled mechanisms for coffee- or tea-making apparatus ; Timers for coffee- or tea-making apparatus; Electronic control devices for coffee- or tea-making apparatus
• CPC Class Codes: A47J 31/525 the electronic control being based on monitoring of specific process parameters
• CPC Class Codes: A47J 31/5253 of temperature
• CPC Class Codes: G05B 19/0426 Programming the control sequence
• CPC Class Codes: G05B 19/108 characterised by physical layout of switches; switches co-operating with display; use of switches in a special way
• CPC Class Codes: G05B 2219/23029 Up down, increment decrement keys, jog, sequentially show functions or values
• CPC Class Codes: G05B 2219/23046 Selection out of menu by function keys
• CPC Class Codes: G05B 2219/23211 Limit value to tolerances, ranges, plausibility
• CPC Class Codes: G05B 2219/23377 Touch screen, with representation of buttons, machine on screen
• CPC Class Codes: G05B 2219/23395 Set value of limit switches, high low value
• CPC Class Codes: G05B 2219/23406 Programmer device, portable, handheld detachable programmer
• CPC Class Codes: G05B 2219/23414 Pc as detachable program, debug, monitor device for control system
• CPC Class Codes: G05B 2219/24069 Diagnostic
• CPC Class Codes: G05B 2219/24167 Encryption, password, user access privileges
• CPC Class Codes: G05B 2219/24172 Use of second password, different from first
• CPC Class Codes: G05B 2219/25175 Modem, codec coder decoder
• CPC Class Codes: G05B 2219/25435 Multiplex for analog signals

Abstract

A control system for a beverage brewing apparatus which includes a programmable control module and a separate input device. The control system is used with a beverage brewing apparatus of the type having an infusion assembly for retaining and filtering a brewing substance, a heated water source and a water distribution system for transporting water from the heated water source to the infusion assembly. The programmable control module controls numerous adjustable functions associated with the brewer and stores at least one function limit for each of the functions which it controls. The separate input device is selectively attachable to the control module for manipulating the function limits of the programmable function retained and controlled by the control module. Function controls are associated with the input device for selecting a function to manipulate and for incrementing and decrementing the limit or limits of the selected function. The control module and input device allow selection of control limits which affect a valve for controlling water flow from the heated water source to the infusion assembly. These control limits establish a dispensing cycle which periodically dispenses water from the heated water source through the water distribution system to the infusion assembly to prevent overflowing the infusion assembly.

Claims

1. A brewer for producing brewed beverages of the type having an infusion assembly for retaining and filtering a brewing substance;

a heated water reservoir, and a water distribution system for controllably transporting heated water from said heated water reservoir to said infusion assembly for infusing a brewing substance retained therein to produce a brewed beverage;

said brewer comprising;

a programmable control circuit operatively associated with said brewer, said control circuit controlling a plurality of functions associated with said brewer and storing at least one function limit for each of the plurality of functions controlled by said control circuit;

a separate input device being selectively couplable with said control circuit for manipulating said function limits of said functions in said control circuit;

means operatively associated with said input device for incrementing and decrementing said function limits of said brewer; and

means for controlling water flow from said heated water reservoir to said infusion assembly, said control means being coupled to said programmable control circuit for controlling the flow of water from said heated water reservoir to said infusion assembly for accommodating a slower filtering rate of brewed beverage through said infusion assembly to prevent overflowing said infusion assembly.

2. A control system for controlling a beverage brewer of the type having an infusion assembly for retaining and filtering a brewing substance, a heated water reservoir, and a water distribution system for controllably transporting heated water from said heated water reservoir to said infusion assembly for infusing a brewing substance retained therein to produce a brewed beverage;

said control system comprising;

a programmable control circuit operatively associated with said brewer, said control circuit controlling a plurality of functions associated with said brewer and storing at least one function limit for each of the plurality of functions controlled by said control module;

a separate input device being selectively couplable with said control circuit for manipulating said function limits of said functions stored in said control circuit; and

means operatively associated with said input device for incrementing and decrementing said function limits of said brewer.

3. A control system for controlling a brewer as recited in claim 2, said input device comprising a pendent including a housing, an input circuit retained in said housing and a cable coupled to said input circuit and extending from said housing a free and of said cable being selectively coupled with a brewer.

4. A control system for controlling a brewer as recited in claim 2, said programmable control circuit includes a CPU, an analog-to-digital converter coupled to said CPU, a programmable memory coupled to said CPU, and a plurality of input/output lines coupled to said programmable control circuit.

5. A control system for controlling a brewer as recited in claim 4, said control system further comprising a fill level sensor including:

a probe extending into said heated water reservoir;

a capacitor coupled to said probe;

said analog-to-digital converter coupled to said capacitor; and

said CPU coupled to said analog-to-digital converter for reading the decay of the pulse from said capacitor through said analog-to-digital converter such that the capacitive coupling prevents the development of a DC potential on said probe to prevent plating on said probe.

6. A control system for controlling a brewer as recited in claim 2, said input device further comprising a display component, a link for selectively coupling said input device to said programmable control circuit, and input controls operatively associated with said display and said CPU for selecting a function to be manipulated and manipulating said selected function.

7. A control system for controlling a brewer as recited in claim 6, wherein said input controls include a function selection key, an increment key, and a decrement key.

8. A control system for controlling a brewer as recited in claim 2, wherein said functions include at least one limited function having at least one function set point, said limited function having a prespecified range within which said at least one function set point can be incremented or decremented using said input device.

9. A brewer for producing brewed beverages of the type having an infusion assembly for retaining and filtering a brewing substance and heated water source operatively associated with the infusion assembly for delivering heated water to said infusion assembly for infusing said brewing substance retained therein to produce a brewed beverage;

a microprocessor operatively associated with said brewer, said microprocessor controlling a plurality of functions associated with said brewer; and

means for controlling water flow from said heated water source to said infusion assembly, said control means being coupled to said microprocessor, said microprocessor including means for activating said control means for controlling the rate of flow of water from said heated water source to said infusion assembly for preventing overflowing said infusion assembly.

10. A brewer for producing brewed beverages as recited in claim 9, further comprising a heated water line communicating with said heated water source and said infusion assembly, said means for controlling water flow further including a controllable valve disposed in said heated water line, said controllable valve being coupled to said microprocessor such that said microprocessor controls the operation of said controllable valve.

11. A brewer for producing brewed beverages of the type having an infusion assembly for retaining and filtering a brewing substance and heated water source operatively associated with the infusion assembly for delivering heated water to said infusion assembly for infusing said brewing substance retained therein to produce a brewed beverage;

a microprocessor operatively associated with said brewer, said microprocessor controlling a plurality of functions associated with said brewer;

a heated water line communicating with said heated water source and said infusion assembly; and

means for controlling water flow from said heated water source to said infusion assembly said control means being coupled to said microprocessor controlling the flow of water from said heated water source to said infusion assembly for preventing overflowing of said infusion assembly, said means for controlling water flow further including a controllable valve disposed in said heated water line, said controllable valve being coupled to said microprocessor such that said microprocessor controls the operation of said controllable valve, said microprocessor operating said controllable valve to pulse a quantity of water from said heated water source through said heated water line to said infusion assembly to provide a draining interval to allow brewed beverage to drain from said infusion assembly to prevent overflowing said infusion assembly.