Gas cook-top with glass (capacitive) touch controls and automatic burner re-ignition

• US 7,527,072 B2
• Filed: 11/30/2006
• Issued: 05/05/2009
• Est. Priority Date: 12/02/2005
• Status: Active Grant

• Current Assignee: Robertshaw Controls Company (Schneider Electric SE)
• Original Assignee: Robertshaw Controls Company (Schneider Electric SE)
• Inventors: Crnkovich, Andrew
• Primary Examiner(s): Rinehart; Kenneth B
• Assistant Examiner(s): PEREIRO, JORGE ANDRES
• Application Number:
  US11/564,935
• Publication Number:
  US 20070125356A1
• Time in Patent Office: 887 Days
• Field of Search: 126/214.R, 126/39.G, 126/39.R, 431/12, 431/27, 431/66, 137/625.34, 137/625.28, 251/129.09
• US Class Current: 137/625.34
• CPC Class Codes: F24C 3/126 on ranges
• CPC Class Codes: Y10T 137/86718 Dividing into parallel flow paths with recombining
• CPC Class Codes: Y10T 137/86767 Spool

Abstract

A gas cook-top with glass (capacitive) touch controls and automatic burner re-ignition is provided. The gas cook-top utilizes a variable flow gas control valve that is driven by an electronic controller whose user interface provides a glass capacitive touch interface. Various electronic features including safety lockouts and burner re-ignition are provided, as is relational control of the burner flame. As a user moves their finger along a flame adjust indicator, the electronic control positions the variable flow gas valve to control the flame height of the burner to correspond to the relative position along the indicator selected by the user.

Claims

1. A gas cook top, comprising:

a burner;

an electronically controlled variable flow gas valve interposed between the burner and an external source of gaseous fuel, the electronically controlled variable flow gas valve comprising;

a housing having an inlet port and an outlet port;

a fluid flow path between said inlet port and said outlet port;

a valve member located in said housing in said fluid flow path, said valve member moveable among a series of indexed positions;

said housing having a plurality of apertures arranged such that a varied selection of said apertures is in said fluid flow path according to the indexed position of said valve member, wherein varied selections of said apertures of each indexed position varies the flow volume permitted through the flow path via the selected one or more apertures, with no said apertures in said flow path for at least one said indexed position of said valve member;

a stepping motor fixedly connected to said valve member, said stepping motor providing for movement between a plurality of predetermined positions, said indexed positions of said valve member corresponding with the predetermined positions of the stepping motor; and

wherein said apertures are provided in an axial array and said stepping motor includes a linear array of magnetic elements operating within a set of axially spaced selectively energized coils;

a capacitive touch user interface; and

a controller operatively coupled to the electronically controlled variable flow gas valve and to the capacitive touch user interface, the controller being programmed to control a flame height of the burner based on input from the capacitive touch user interface.

2. The gas cook top of claim 1, wherein the capacitive touch user interface includes a flame adjust icon, and wherein the controller adjusts the electronically controlled variable flow gas valve to vary an amount of gaseous fuel flowing to the burner to control the flame height in response to a user selection of the flame adjust icon.

3. The gas cook top of claim 2, wherein the flame adjust icon has a length, and wherein the controller adjusts the electronically controlled variable flow gas valve to vary an amount of gaseous fuel flowing to the burner to control the flame height in response to a user selection of the flame adjust icon relative to its length.

4. The gas cook top of claim 1, wherein the capacitive touch user interface includes a burner select icon, and wherein the controller controls the electronically controlled variable flow gas valve to allow gaseous fuel to begin flowing to the burner to turn on the burner in response to a user selection of the burner select icon.

5. The gas cook top of claim 4, wherein the controller controls the electronically controlled variable flow gas valve to stop a flow of gaseous fuel to the burner to turn off the burner in response to a user selection of the burner select icon when the burner is on.

6. The gas cook top of claim 4, wherein the controller provides a visual indication to a user prior to controlling the electronically controlled variable flow gas valve to allow gaseous fuel to begin flowing to the burner to turn on the burner indicating that flame will soon be present.

7. The gas cook top of claim 4, wherein the controller controls the electronically controlled variable flow gas valve to allow gaseous fuel to begin flowing to the burner to turn on the burner at a lowest flame height in response to a user selection of the burner select icon.

8. The gas cook top of claim 4, wherein the controller controls the electronically controlled variable flow gas valve to allow gaseous fuel to begin flowing to the burner to turn on the burner at a previous setting of flame height in response to a user selection of the burner select icon.

9. The gas cook top of claim 1, further comprising a flame sense electrode positioned in proximity to the burner and operatively coupled to the controller, and wherein the controller is programmed to attempt to reignite the burner when the flame sense electrode senses a flame out condition.

10. The gas cook top of claim 9, wherein the controller is programmed to shut off the electronically controlled variable flow gas valve if the flame sense electrode continues to sense a flame out condition after the attempt to reignite the burner to stop a flow of gaseous fuel thereto.

11. The gas cook top of claim 1, wherein the capacitive touch user interface includes a child lockout icon, and wherein the controller is programmed to enter a lockout mode of operation to prohibit a flow of gaseous fuel to the burner in response to a user selection of the child lockout icon.

12. The gas cook top of claim 11, wherein the controller is programmed to exit the lockout mode of operation in response to the user selection of the child lockout icon for a predetermined period when the controller is in the lockout mode of operation.

13. The gas cook top of claim 1, further comprising a plurality of burners, and wherein the controller is programmed to control the flame height of each of the plurality of burners based on inputs from the capacitive touch user interface.

14. The gas cook top of claim 13, wherein the capacitive touch user interface includes an emergency burner off icon, and wherein the controller is programmed to stop a flow of gaseous fuel to all of the burners in response to a user selection of the emergency burner off icon.

15. The gas cook top of claim 13, further comprising a plurality of electronically controlled variable flow gas valves associated with the plurality of burners, wherein the capacitive touch user interface includes a plurality of burner select icons corresponding with the plurality of burners, and wherein the controller controls each of the plurality of electronically controlled variable flow gas valves to allow gaseous fuel to begin flowing to its associated burner to turn on the burner in response to a user selection of the associated burner select icon.

16. The gas cook top of claim 1, wherein the capacitive touch user interface is a glass capacitive touch user interface.

17. The gas cook top of claim 1, wherein the capacitive touch user interface includes a program setting icon, and wherein the controller adjusts the electronically controlled variable flow gas valve to vary an amount of gaseous fuel flowing to the burner to control the flame height to a programmed level in response to a user selection of the program setting icon.

18. A gas cook top, comprising:

a plurality of gaseous fuel burners;

a plurality of electronically controlled variable flow gas valves associated with the plurality of gaseous fuel burners to control an amount of gaseous fuel flowing thereto, each of the electronically controlled variable flow gas valves comprising;

a housing having an inlet port and an outlet port;

a fluid flow path between said inlet port and said outlet port;

a valve member located in said housing in said fluid flow path, said valve member moveable among a series of indexed positions;

said housing having a plurality of apertures arranged such that a varied selection of said apertures is in said fluid flow path according to the indexed position of said valve member, wherein varied selections of said apertures of each indexed position varies the flow volume permitted through the flow path via the selected one or more apertures, with no said apertures in said flow path for at least one said indexed position of said valve member;

a stepping motor fixedly connected to said valve member, said stepping motor providing for movement between a plurality of predetermined positions;

said indexed positions of said valve member corresponding with the predetermined positions of the stepping motor; and

wherein said apertures are provided in an axial array and said stepping motor includes a linear array of magnetic elements operating within a set of axially spaced selectively energized coils;

a capacitive touch user interface having a plurality of burner select icons and flame height adjust icons associated with each of the plurality of gaseous fuel burners; and

a controller operatively coupled to the plurality of electronically controlled variable flow gas valves and to the capacitive touch user interface, the controller being programmed to control a position of each of the electronically controlled variable flow gas valves to vary the amount of gaseous fuel flowing therethrough based on input from the plurality of burner select icons and flame height adjust icons on the capacitive touch user interface.

19. The gas cook top of claim 18, further comprising a plurality of flame sense electrodes, and wherein the controller is programmed to attempt to re-establish a flame upon indication from the flame sense electrodes that a flame out condition has occurred.

20. A gas appliance, comprising:

a burner;

an electronically controlled variable flow gas valve interposed between the burner and an external source of gaseous fuel, the electronically controlled variable flow gas valve comprising;

a housing having an inlet port and an outlet port;

a fluid flow path between said inlet port and said outlet port;

a valve member located in said housing in said fluid flow path, said valve member moveable among a series of indexed positions;

said housing having a plurality of apertures arranged such that a varied selection of said apertures is in said fluid flow path according to the indexed position of said valve member, wherein varied selections of said apertures of each indexed position varies the flow volume permitted through the flow path via the selected one or more apertures, with no said apertures in said flow path for at least one said indexed position of said valve member;

a stepping motor fixedly connected to said valve member, said stepping motor providing for movement between a plurality of predetermined positions, said indexed positions of said valve member corresponding with the predetermined positions of the stepping motor; and

wherein said apertures are provided in an axial array and said stepping motor includes a linear array of magnetic elements operating within a set of axially spaced selectively energized coils;

a user interface having user selectable heat settings; and

a controller operatively coupled to the electronically controlled variable flow gas valve and to the user interface, the controller being programmed to control a flow of gaseous fuel to the burner based on input from the user interface of a desired heat setting.