Self-optimizing detergent controller for controlling variable additive concentration level in a warewashing machine

• US 5,681,400 A
• Filed: 03/21/1995
• Issued: 10/28/1997
• Est. Priority Date: 03/12/1992
• Status: Expired due to Term

• Current Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Original Assignee: Ecolab, Inc.
• Inventors: Copeland, James L., Brady, Daniel F., Bailey, Clyde A., McCall, John E. Jr.
• Primary Examiner(s): Soderquist, Arlen
• Assistant Examiner(s): CHAUDHRY, SAEED T
• Application Number:
  US08/408,560
• Time in Patent Office: 952 Days
• Field of Search: 134/18, 134/25.2, 134/57 D, 134/57 R, 134/58 D, 134/58 R, 134/56 D, 134/56 R, 422/111, 422/110, 68/12.18, 68/12.02
• US Class Current: 134/18
• CPC Class Codes: A47L 15/0055 Metering or indication of used products, e.g. type or quantity of detergent, rinse aid or salt; for measuring or controlling the product concentration
• CPC Class Codes: A47L 15/449 Metering controlling devices A47L15/4229 takes precedence
• CPC Class Codes: A47L 2301/00 Manual input in controlling methods of washing or rinsing machines for crockery or tableware, i.e. information entered by a user
• CPC Class Codes: A47L 2401/20 Time, e.g. elapsed operating time
• CPC Class Codes: A47L 2501/07 Consumable products, e.g. detergent, rinse aids or salt
• CPC Class Codes: A47L 2501/26 Indication or alarm to the controlling device or to the user
• CPC Class Codes: D06F 2103/22 Content of detergent or additives
• CPC Class Codes: D06F 2103/38 Time, e.g. duration
• CPC Class Codes: D06F 34/06 Timing arrangements
• CPC Class Codes: D06F 39/02 Devices for adding soap or other washing agents
• CPC Class Codes: G05B 13/024 in which a parameter or coefficient is automatically adjusted to optimise the performance

Abstract

An apparatus and method for programming a controller to vary the concentration set-point of an additive as a function of time. The present invention insures that the additive is injected to the machine at proper times to allow for optimum efficiency and lowest cost. To vary the set-point according to the input parameters, the invention combines the features of a data entry device, a microprocessor, a clock, a controller, and sensors into one unit. The user may enter a time setting and set point into the controller, along with control parameters which allow the machine to control the additive injection based on different user-defined scenarios. The microprocessor then reads the settings and outputs an appropriate set-point value from the microprocessor to the controller. Thus, the user can manually or automatically change the response function if and when conditions change.

Claims

1. An apparatus for controlling at least one variable additive concentration level in a warewashing machine, comprising:

timer means for providing a clock signal;

input means for receiving input to identify at least one system parameter;

processing means, coupled to said timer means and said input means, for determining a first set-point value based on said clock signal and said system parameters and for generating a control signal to control said additive concentration level in response thereto; and

regulating means, coupled to said processing means, for regulating said additive concentration level based on said control signal from said processing means.

2. The apparatus of claim 1, wherein the input means further comprises a data entry means for entering user-defined inputs comprising at least one user-defined time associated with a corresponding initial set-point value.

3. The apparatus of claim 2, wherein said processing means further determines a first set-point value based on said user-defined inputs and said clock signal.

4. The apparatus of claim 1, wherein the input means further comprises a data entry means for entering at least one user-defined time associated with a corresponding initial set-point value, and at least one control parameter.

5. The apparatus of claim 4, wherein said processing means further determines a first set-point value based on said user-defined time, said clock signal, and said control parameter.

6. The apparatus of claim 4, wherein said control parameter is at least one elapsed time.

7. The apparatus of claim 6, wherein said processing means further determines a first set-point value based on said control parameter, said elapsed time, and said clock signal.

8. The apparatus of claim 1, wherein said system parameter is at least one elapsed time.

9. The apparatus of claim 8, wherein said processing means further determines a first set-point value based on said elapsed time and said clock signal.

10. The apparatus of claim 1, wherein said input means further comprises a sensor for measuring the system parameter and generating a sensor signal in response thereto.

11. The apparatus of claim 10, said processing means further determining a set-point value based on said sensor signal and said clock signal.

12. The apparatus of claim 10, said processing means further determining a set-point value based on said system parameters, said sensor signal, and said clock signal.

13. The apparatus of claim 10, wherein said sensor measures temperature.

14. The apparatus of claim 10, wherein said sensor measures humidity.

15. The apparatus of claim 1, wherein said processing means further determines a second set-point value corresponding to a second additive concentration level, wherein said second set-point value is controlled independently of said first set-point value.

16. A method for controlling at least one variable additive concentration level in a warewashing machine, comprising the steps of:

providing a clock signal;

inputting at least one system parameter;

determining at least one set-point value based on said clock signal and said system parameters;

generating a control signal to control said additive concentration level in response to at least one determined set-point value; and

regulating said additive concentration level based on said control signal by controlling an amount of additive injected into said warewashing machine.

17. The method of claim 16, wherein the step of inputting the system parameters further comprises the step of entering at least one user-defined time with a corresponding initial set-point value.

18. The method of claim 17, wherein the step of determining at least one set-point value is based on at least one user-defined time and said clock signal.

19. The method of claim 16, wherein the step of inputting the system parameters further comprises the step of entering at least one user-defined time associated with a corresponding initial set-point value, and at least one control parameter.

20. The method of claim 19, wherein the step of determining at least one set-point value is based on at least one user-defined time, said clock signal, and said control parameter.

21. The method of claim 19, wherein the step of inputting the system parameters further comprises the step of entering at least one control parameter that is an elapsed time.

22. The method of claim 21, wherein the step of determining at least one set-point value is based on at least one user-defined time, said elapsed time, and said clock signal.

23. The method of claim 16, wherein the step of determining at least one set-point value further comprises the step of defining a system parameter as an elapsed time.

24. The method of claim 23, wherein the step of determining at least one set-point value is based on said elapsed time and said clock signal.

25. The method of claim 16, wherein the step of inputting the system parameters further comprises the step of measuring at least one system parameter with a sensor and generating a signal in response thereto.

26. The method of claim 25, wherein the step of determining at least one set-point value is based on said sensor measurement and said clock signal.

27. The method of claim 25, wherein the step of determining at least one set-point value is based on said sensor measurement, said system parameters, and said clock signal.

28. The method of claim 25, wherein said system parameter is temperature.

29. The method of claim 25, wherein said system parameter is humidity.

30. The method of claim 16, wherein the step of determining at least one set-point value further comprises the step of determining a second set-point value corresponding to a second additive concentration level, wherein said second set-point value is controlled independently of said first set-point value.

31. An apparatus for controlling at least one variable additive concentration level in a machine, comprising:

a clock for providing a timing signal;

input means for entering at least one system parameter;

processing means, coupled to said timer means and said input means, for determining at least one set-point value based on said system parameters and for generating a control signal to control said additive concentration level in response thereto; and

regulating means, coupled to said processing means, for regulating said additive concentration level based on said control signal from said processing means.

32. The apparatus of claim 31, wherein said system parameter is at least one elapsed time.

33. The apparatus of claim 31, further comprising a sensor for measuring at least one system parameter and generating a signal in response thereto.

34. The apparatus of claim 33, wherein said processing means determines a set-point value based on said sensor signal, said timing signal, and said system parameters.

35. The apparatus of claim 31, wherein said processing means further determines a second set-point value corresponding to a second additive concentration level, wherein said second set-point value is controlled independently of said first set-point value.