System and method for washing machine cycle identification and chemical dosing identification

• US 5,897,671 A
• Filed: 11/07/1997
• Issued: 04/27/1999
• Est. Priority Date: 11/07/1997
• Status: Expired due to Term

• Current Assignee: Diversey Incorporated (Sealed Air)
• Original Assignee: Diverseylever Incorporated (Unilever PLC)
• Inventors: Steed, Michael A., Newman, Steven S., Cords, Robert G.
• Primary Examiner(s): Coe, Philip R.
• Application Number:
  US08/965,812
• Time in Patent Office: 536 Days
• Field of Search: 68/12.02, 68/12.18, 68/17 R, 8/158, 222/651, 222/1
• US Class Current: 8/158
• CPC Class Codes: D06F 39/022 in a liquid state D06F39/024 takes precedence

Abstract

A chemical dispensing system controller is used in conjunction with a mechanism for dispensing specified chemicals and a device that transmits trigger signals to the control system for requesting chemicals to be dispensed. The controller receives and accumulates sequences of the transmitted trigger signals. Each trigger signal sequence is preceded and followed by a period of time of predefined duration during which no trigger signals are received. At least some of the trigger signals in some of the trigger signal sequences are not received simultaneously. Also, the number of distinct chemical feed requests that can be communicated using the accumulated trigger signals exceeds the number of distinct trigger signals. The controller maps a first subset of the accumulated trigger signal sequences into chemical feed requests, each of which requests a quantity of a corresponding chemical. The controller enables the dispensing of chemicals in accordance with the chemical feed requests. A second subset of the accumulated trigger signal sequences are mapped into wash classification codes, each of which identifies a type of wash load to be washed using the dispensed chemicals. The number of distinct wash classification codes that can be communicated using the accumulated trigger signals exceeds the number of distinct trigger signals. When the control system uses a classification dependent feed arrangement, the chemical feed request corresponding to each received trigger signal sequence is determined based on both the current wash load type and the accumulated sequence of trigger signals.

Claims

1. A control system for use in conjunction with a mechanism for dispensing chemicals from a set of chemical supplies and a device that transmits trigger signals to the control system for requesting chemicals to be dispensed from the chemical supplies, the control system comprising:

trigger signal accumulating means for accumulating sequences of trigger signals received by the control system, each trigger signal sequence consisting of one or more received trigger signals, each trigger signal sequence being preceded and followed by a period of time of predefined duration during which no trigger signals are received;

wherein a non-zero subset of the trigger signal sequences received each includes two or more trigger signals, and wherein at least some of the trigger signals in some of the trigger signal sequences are not received simultaneously;

trigger signal sequence mapping means for mapping at least a subset of the accumulated sequence of trigger signals received by the control system into corresponding control codes;

dispensing control means for controlling the dispensing of chemicals from the chemical supplies in accordance with the control codes.

2. The control system of claim 1, wherein:

the trigger signal sequence mapping means maps at least a first non-zero subset of the accumulated trigger signal sequences into chemical feed requests, each chemical feed request comprising a request for dispensing a quantity of chemical from a corresponding one of the chemical supplies; and

the dispensing control means controls the dispensing of chemicals from the chemical supplies in accordance with the chemical feed requests.

3. The control system of claim 2, wherein:

the trigger signal sequence mapping means maps a second non-zero subset of the accumulated trigger signal sequences into wash classification codes, each wash classification code identifying a type of wash load to be washed using the dispensed chemicals;

the device that transmits trigger signals can transmit at most T distinct trigger signals, the wash classification codes requests to which accumulated trigger signal sequences are mapped by the mapping means include at least W distinct wash classification codes, and W is larger than T; and

the control system including data logging means for logging the wash classification codes and chemical feed requests.

4. The control system of claim 3, wherein the trigger signal sequence mapping means maps the first subset of accumulated trigger signal sequences into chemical feed requests in accordance with an earlier received trigger signal sequence that was mapped into a wash classification code, such that at least one predefined trigger signal sequence is mapped into a first chemical feed request for a first wash load type and is mapped into a distinct, second chemical feed request for a second wash load type.

5. The control system of claim 3, wherein

the trigger signal sequence mapping means maps at least one predefined accumulated trigger signal sequence into a wash cycle end code;

and

the trigger signal sequence mapping means includes means for rejecting an accumulated trigger signal sequence in the second subset when the accumulated trigger signals sequence in the second subset has not been preceded by one of the at least one predefined accumulated trigger signal sequences that are mapped into a wash cycle end code.

6. The control system of claim 3, wherein

the control system includes power outage detection means for detecting control system power outages and for determining duration of such control system power outages;

and

the trigger signal sequence mapping means includes means for rejecting an accumulated trigger signal sequence in the first subset when (A) the power outage detection means has detected a power outage whose duration exceeded a predefined threshold, and (B) a trigger signal sequence in the second subset has not been received since a last time the power outage detection means detected a power outage whose duration exceeded the predefined threshold.

7. The control system of claim 2, wherein the device that transmits trigger signals can transmit at most T distinct trigger signals, the chemical feed requests to which accumulated trigger signal sequences are mapped by the mapping means include at least R distinct chemical feed requests, and R is larger than T.

8. The control system of claim 1, wherein:

the trigger signal sequence mapping means maps a non-zero subset of the accumulated trigger signal sequences into wash classification codes, each wash classification code identifying a type of wash load to be washed using the dispensed chemicals;

the device that transmits trigger signals can transmit at most T distinct trigger signals, the wash classification codes requests to which accumulated trigger signal sequences are mapped by the mapping means include at least W distinct wash classification codes, and W is larger than T; and

the control system including data logging means for logging the wash classification codes and chemical feed requests.

9. A method of controlling chemical dispensing, for use in conjunction with a mechanism for dispensing chemicals from a set of chemical supplies, and a device that transmits trigger signals to the control system for requesting chemicals to be dispensed from the chemical supplies, the control system comprising:

receiving and accumulating sequences of the transmitted trigger signals, each trigger signal sequence consisting of one or more trigger signals, each trigger signal sequence being preceded and followed by a period of time of predefined duration during which no trigger signals are received;

wherein a non-zero subset of the trigger signal sequences received each includes two or more trigger signals, and wherein at least some of the trigger signals in some of the trigger signal sequences are not received simultaneously;

mapping at least a subset of the accumulated sequence of trigger signals received by the control system into corresponding control codes; and

controlling the dispensing of chemicals from the chemical supplies in accordance with the control codes.

10. The control method of claim 9, wherein:

the mapping step maps at least a first non-zero subset of the accumulated trigger signal sequences into chemical feed requests, each chemical feed request comprising a request for dispensing a quantity of the chemical from a corresponding one of the chemical supplies; and

controlling the dispensing of chemicals from the chemical supplies in accordance with the chemical feed requests.

11. The control method of claim 10, wherein:

the mapping step maps a second non-zero subset of the accumulated trigger signal sequences into wash classification codes, each wash classification code identifying a type of wash load to be washed using the dispensed chemicals;

the device that transmits trigger signals can transmit at most T distinct trigger signals, the wash classification codes requests to which accumulated trigger signal sequences are mapped include at least W distinct wash classification codes, and W is larger than T; and

the method includes logging the wash classification codes and chemical feed requests.

12. The control method of claim 11, wherein the mapping step maps the first subset of accumulated trigger signal sequences into chemical feed requests in accordance with an earlier received trigger signal sequence that was mapped into a wash classification code, such that at least one predefined trigger signal sequence is mapped into a first chemical feed request for a first wash load type and is mapped into a distinct, second chemical feed request for a second wash load type.

13. The control method of claim 11, wherein

the mapping step maps at least one predefined accumulated trigger signal sequence into a wash cycle end code;

and

the mapping step rejects an accumulated trigger signal sequence in the second subset when the accumulated trigger signals sequence in the second subset has not been preceded by one of the at least one predefined accumulated trigger signal sequences that are mapped into a wash cycle end code.

14. The control method of claim 11, wherein

the method includes detecting control system power outages and determining duration of such control system power outages;

and

the mapping step includes rejecting an accumulated trigger signal sequence in the first subset when (A) the power outage whose duration exceeds a predefined threshold has been detected, and (B) a trigger signal sequence in the second subset has not been received since a last time that a power outage was detected whose duration exceeded the predefined threshold.

15. The control method of claim 10, wherein the device that transmits trigger signals can transmit at most T distinct trigger signals, the chemical feed requests to which accumulated trigger signal sequences are mapped by the mapping means include at least R distinct chemical feed requests, and R is larger than T.

16. The control method of claim 9, wherein:

the mapping step maps a non-zero subset of the accumulated trigger signal sequences into wash classification codes, each wash classification code identifying a type of wash load to be washed using the dispensed chemicals;

the device that transmits trigger signals can transmit at most T distinct trigger signals, the wash classification codes requests to which accumulated trigger signal sequences are mapped include at least W distinct wash classification codes, and W is larger than T; and

the method includes logging the wash classification codes and chemical feed requests.