Remote control for a domestic appliance

• US 5,321,229 A
• Filed: 04/05/1993
• Issued: 06/14/1994
• Est. Priority Date: 04/05/1993
• Status: Expired due to Term

• Current Assignee: Whirlpool Corporation
• Original Assignee: Whirlpool Corporation
• Inventors: Manson, Larry J., Holling, Ronald W., Huener, Jerome D.
• Primary Examiner(s): Reynolds, Bruce A.
• Assistant Examiner(s): Jeffery, John A.
• Application Number:
  US08/043,950
• Time in Patent Office: 435 Days
• Field of Search: 219/453, 219/452, 219/451, 219/448, 219/416, 219/506, 340/825.69, 340/825.71, 340/825.16, 340/825.17, 340/825.36, 340/539, 236/51, 341/176
• US Class Current: 219/445.1
• CPC Class Codes: F24C 7/087 of electric circuits regulating heat

Abstract

A cooking appliance or an electronic control for a cooking appliance or an electronic control for a cooking appliance and method of controlling the same includes a remote control unit having a built-in temperature sensor, positional switch and low-battery detection circuit is in two-way intermittent wireless communication with the appliance control unit. The appliance control unit includes a switch means for controlling the heating elements of the cooking appliance wherein the switch means for each heating element includes two power switches connected in series and coupled with a redundancy detection circuit for the detection of a failure of one of the two power switches. Two-way communication between the two control units of the present invention is constantly monitored to ensure proper operation of the cooking appliance and to provide a mechanism to report errors to the user or to shut down the cooking appliance, as appropriate, soon after an error is detected. Mechanisms are also provided whereby the wireless communication means of the control units may be diagnosed to ensure the control units are properly communicating with each other.

Claims

1. An electronic control for use with a cooking appliance, comprising:

a remote control unit adapted to be located remote from said cooking appliance, said remote control unit including

selection means for selecting the operational parameters of said cooking appliance and for generating selection signals,

processing means for processing such selections into a plurality of output signals, said output signals including a start signal, and a signal identifying said remote control unit,

first wireless communication means for intermittently sending said output signals and for intermittently receiving reply signals, and

timing means for measuring the time period between the receipt by said first wireless communication means of successive reply signals;

warning means for generating a warning signal upon the determination of an elapsed time period between the transmission of said intermittent output signals and the receipt of said intermittent reply signals by said first wireless communication means exceeding a first predetermined value; and

an appliance control unit, said appliance control unit including

means for generating said reply signals, said reply signals having a start signal, and a signal identifying said cooking appliance,

second wireless communication means operatively connected to said generating means for intermittently receiving said output signals and for intermittently sending said reply signals, and

switch means for controlling said cooking appliance, said switch means operatively connected to said second wireless communication means.

2. The electronic control according to claim 1, wherein said warning means is included in said remote control unit.

3. The electronic control according to claim 1, further wherein:

said timing means measures the time period between the receipt by said first wireless communication means of successive error free reply signals; and

said warning means generates a warning signal upon the determination of an elapsed time period between the transmission of said intermittent output signals and the error free receipt of said intermittent reply signals by said first wireless communication means exceeding a first predetermined value.

4. The electronic control according to claim 1, wherein said appliance control further comprises:

means for measuring the total period of time between the receipt by said second wireless communication means of successive error free intermittent output signals; and

means for deenergizing said cooking appliance upon the determination of an elapsed total period of time between the receipt of successive intermittent output signals by said second wireless communication means exceeding a second predefined value.

5. A cooking appliance, comprising:

a remote control unit adapted to be located remote from said cooking appliance, said remote control unit including

selection means for selecting the operational parameters of said cooking appliance and for generating selection signals,

processing means for processing such selections into a plurality of output signals, said output signals including a start signal, and a signal identifying said remote control unit,

first wireless communication means for intermittently sending said output signals and for intermittently receiving reply signals, and

counting means for counting the receipt of consecutive corrupted intermittent reply signals by said first wireless communication means;

warning means for generating a warning signal upon the determination of a number of consecutive corrupted intermittent reply signals received by said wireless communication means exceeding a first predetermined number; and

an appliance control unit, said appliance control unit including

means for generating said reply signals, said reply signals having a start signal, and a signal identifying said cooking appliance,

second wireless communication means operatively connected to said generating means for intermittently receiving said output signals and for intermittently sending said reply signals, and

switch means for controlling said cooking appliance, said switch means operatively connected to said second wireless communication means.

6. The cooking appliance of claim 5 wherein said first and second wireless communication means send and receive said output and reply signals via an intermittent infrared beam.

7. The cooking appliance of claim 6 wherein said cooking appliance further comprises a glass ceramic cooktop and said appliance control unit is disposed beneath said glass ceramic cooktop.

8. The cooking appliance of claim 5 wherein said cooking appliance further comprises at least one heating element and said output signals further comprise a signal specifying the mode of operation of said control unit, a signal representing the selected power levels of said heating element and a first checksum signal.

9. The cooking appliance of claim 8 wherein said reply signals further comprise a signal representing the mode of operation of said cooking appliance and a second checksum signal.

10. The cooking appliance according to claim 5, wherein said warning means is included in said remote control unit.

11. The cooking appliance according to claim 5, wherein said appliance control further comprises:

timing means for measuring the total period of time between the receipt by said second wireless communication means of uncorrupted successive intermittent output signals; and

means for deenergizing said cooking appliance upon the determination of an elapsed total period of time between the receipt by said second wireless communication means of successive intermittent output signals signals exceeding a second predefined value.

12. A method of controlling a cooking appliance, said cooking appliance including a remote control unit adapted to be located remote from said cooking appliance, said remote control unit having selection means for selecting the operational parameters of said cooking appliance and for generating selection signals, processing means for processing such selections into a plurality of output signals, said output signal including a start signal, and a signal identifying said remote control unit, said remote control unit further including first wireless communication means for intermittently sending said output signals and for intermittently receiving reply signals, and timing means for measuring the time period between the receipt by said first wireless communication means of successive intermittent reply signals, warning means for generating a warning signal upon the determination of an elapsed time period between the transmission of said intermittent output signals and the receipt of said intermittent reply signals exceeding a first predetermined value, and said cooking appliance further comprising an appliance control unit, said appliance control unit including means for generating said reply signals and switch means for controlling said cooking appliance, said reply signals having a start signal, and a signal identifying said cooking appliance, said appliance control unit further including second wireless communication means operatively connected to said generating means for intermittently receiving said output signals and for intermittently sending said reply signals, said switch means operatively connected to said wireless communication means, said method comprising the steps of:

selecting said operational parameters of said cooking appliance;

processing said selections into a plurality of output signals;

intermittently transmitting said output signals from said first wireless communication means;

intermittently receiving said output signals at said second wireless communication means;

generating said reply signals;

intermittently transmitting said reply signals from said second wireless communication means;

intermittently receiving said reply signals with said first wireless communication means;

timing the time period between the receipt by said first wireless communication means of successive intermittent reply signals, and

generating a warning signal upon the determination of an elapsed time period between the transmission of said intermittent output signals and the receipt of said intermittent reply signals by said first wireless communication means exceeding a first predetermined value.

13. The method of claim 12 wherein said output and reply signals are intermittently transmitted and received via an intermittent infrared beam.

14. The method of claim 12, further comprising the steps of:

measuring the total period of time between the receipt by said second wireless communication means of uncorrupted successive output signals; and

deenergizing said cooking appliance upon the determination of an elapsed total period of time between the receipt by said second wireless communication means of successive output signals signals exceeding a second predefined value.

15. A electronic control for use with a cooking appliance, comprising:

a remote control unit adapted to be located remote from said cooking appliance, said remote control unit having

means for repetitively generating an output signal having a first predetermined time interval between each output signal,

first wireless communication means for sending said output signals and for receiving reply signals, and

timing means for timing the time period between the receipt by first wireless communication means of successive reply signals;

warning means for generating a warning signal upon the determination of an elapsed time period between the transmission of said intermittent output signals and the receipt of said intermittent reply signals exceeding a second predetermined value greater than at least twice said first predefined time interval; and

an appliance control unit adapted to be located within said cooking appliance, said appliance control unit having

means for repetitively generating said reply signal at predefined time intervals in response to said output signal,

second wireless communication means operatively connected to said reply signal generating means for receiving said output signals and for sending said reply signals, and

switch means for controlling said cooking appliance, said switch means operatively connected to said second wireless communication means.

16. The electronic control of claim 15, wherein said appliance control unit further comprises:

second timing means for measuring the total period of time between the receipt by said second wireless communication means of uncorrupted successive output signals, said second timing means being included in said appliance control unit; and

means for deenergizing said cooking appliance upon the determination of an elapsed total period of time between the receipt by said second wireless communication means of intermittent output signals signals exceeding a third predefined value greater than at least ten seconds.

17. A method for controlling a cooking appliance, said cooking appliance including a remote control unit adapted to be located remote from said cooking appliance, said remote control unit having means for repetitively generating an output signal having a first predefined time interval between each output signal, first wireless communication means for sending said output signals and for receiving reply signals, and timing means for timing the time period between the receipt by first wireless communication means of successive reply signals, warning means for generating a warning signal upon the determination of an elapsed time period between the transmission of said intermittent output signals and the receipt of said intermittent reply signals exceeding a second predetermined value greater than at least twice said first predefined time interval, and said cooking appliance further including an appliance control unit having means for repetitively generating said reply signal at predetermined time intervals in response to said output signal, second wireless communication means operatively connected to said reply signal generating means for receiving said output signals and for sending said reply signals, and switch means for controlling said cooking appliance, said switch means operatively connected to said second wireless communication means, said method comprising the steps of:

generating said output signal after passage of each of said first predefined time interval;

transmitting said output signal with said first wireless communication means;

receiving said output signal at said second wireless communication means;

generating said reply signal in response to said output signal;

transmitting said reply signal with said second wireless communication means;

receiving said reply signal at said first wireless communication means;

measuring the time period between the transmission of said output signals and the receipt of said reply signals; and

generating a warning signal upon the determination of an elapsed time period between the transmission of said intermittent output signals and the receipt of said intermittent reply signals exceeding a second predetermined value greater than at least twice said first predefined time interval.

18. The method for controlling a cooking appliance according to claim 17, further comprising the steps of:

measuring the total period of time between the receipt by said second wireless communication means of uncorrupted successive output signals; and

deenergizing said cooking appliance upon the determination of an elapsed total period of time between the receipt by said second wireless communication means of intermittent output signals signals exceeding a third predefined value greater than at least ten seconds.

19. The method for controlling a cooking appliance according to claim 17, further comprising the steps of:

measuring the total period of time between the receipt by said second wireless communication means of uncorrupted successive output signals; and

deenergizing said cooking appliance upon the determination of an elapsed total period of time between the receipt by said second wireless communication means of intermittent output signals signals exceeding a third predefined value greater than at least ten seconds.