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1. WO2020112334 - CONTRÔLE DE BROYEUR DE DÉCHETS ALIMENTAIRES AU MOYEN D'UNE DIFFÉRENCE DE PHASE ENTRE UNE TENSION DE MOTEUR ET UN COURANT DE MOTEUR

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CLAIMS

What is claimed is:

1. A method of determining status of operation of a food waste disposer that includes whether the food waste disposer is grinding, the food waste disposer having a food conveying section, a motor section in which an induction motor is disposed and that rotates a rotatable shredder plate of a grind and discharge section, the motor powered by alternating current electrical power having a line frequency, a line voltage and a line current, the method comprising;

reading with the controller phase shifts between the line current and line voltage every half cycle of the line frequency; and

when the motor of the food waste disposer is running and after expiration of a start-up period, determining with the controller that the food waste disposer is grinding when each of a first predetermined number of consecutively read phase shifts that were most recently read is less than a grind check phase shift threshold.

2. The method of claim 1 wherein the status of operation includes whether the food waste disposer has finished grinding, the method further including determining with the controller that the food waste disposer has finished grinding when no phase shift reading taken during a predetermined period of time after the food waste disposer was determined to be grinding is not less than the grind check phase shift threshold.

3. The method of claim 2 wherein the status of operation includes whether the food waste disposer is jammed, the method further including determining with the controller that the food waste disposer is jammed when a jam check phase shift parameter is less than a jam check phase shift threshold.

4. The method of claim 3 including determining the jam check phase shift parameter by keeping with the controller a rolling average of a third predetermined number of consecutive phase shift readings that the controller updates each time a new phase shift reading is taken and setting the jam check phase shift parameter to the rolling average.

5. The method of claim 4 wherein the jam check phase shift threshold is forty-five degrees.

6. The method of claim 3 including determining that the jam check phase shift parameter is below the jam check phase shift threshold when a jam check number of consecutive most recently read phase shift readings are all below the jam check phase shift threshold.

7. The method of claim 6 wherein the jam check phase shift threshold is forty-five degrees.

8. The method of claim 1 wherein the grind check phase shift threshold is a predetermined value programmed in the controller.

9. The method of claim 1 further including determining the grind check phase shift threshold with a user initiated calibration routine that includes upon a user initiating the calibration routine, having the controller turn the motor of the food waste disposer on, after expiration of the start-up period, having the controller record a second predetermined number of consecutively read phase shift readings, having the controller calculate an average of the second predetermined number of consecutively read phase shift readings and with the controller setting the grind check phase shift threshold to this average minus a predetermined amount.

10. The method of claim 9 wherein the first predetermined number is five and the second predetermined number is ten.

11. The method of claim 1 further including determining the grind check phase shift threshold with a self-calibration routine.

12. The method of claim 11 wherein determining the grind check phase shift threshold with the self-calibration routine includes recording a highest phase shift reading during a food waste disposer run cycle and setting with the controller the grind check phase shift threshold to be this recorded highest phase shift reading minus a predetermined amount.

13. The method of claim 12 wherein the first predetermined number is five.

14. The method of claim 11 wherein determining the grind check phase shift threshold with the self-calibration routine includes after the start-up period keeping with the controller a rolling average of a third predetermined number of consecutive phase shift readings that the controller updates each time a new phase shift reading is taken, and setting with the controller the grind check phase shift threshold to be this rolling average minus a predetermined amount.

15. The method of claim 14 wherein the first predetermined number is five and the third predetermined number is 128.

16. The method of claim 1 wherein a power outlet has two outlets wherein one of the outlets is for the food waste disposer and the other outlet is for an instant hot water tank having a resistive heater, the method further including determining with the controller whether the instant hot water tank is plugged into the outlet for the food waste disposer when power to the receptacle for the food waste disposer is on when a most recently read phase shift is less than a food waste disposer outlet low limit or greater than a food waste disposer high limit and also determining with the controller that the food waste disposer is plugged into the receptacle for the instant hot water tank when power to the hot water tank receptacle is turned on when the most recently read phase shift reading is at least a hot water tank outlet limit.

17. The method of claim 16 including illuminating with the controller a visual indicator indicative of the food waste disposer grinding when the controller determines that the food waste disposer is grinding, a visual indicator indicative of the food waste disposer being jammed when the controller determines that the food waste disposer is jammed and a visual indicator indicative of an improper device being plugged into the outlet for the food waste disposer or the outlet for the instant hot water tank when the controller determines that the food waste disposer was plugged into the outlet for the hot water tank or the controller determines that the instant hot water tank was plugged into the outlet for the food waste disposer.