US5410230A — Variable speed HVAC without controller and respon…

Claim 1

Independent Claim 210 words

A system for conditioning air in a space by heating or cooling the air to change its temperature, said system comprising: a circuit, responsive to the temperature of the air in the space, for generating a two state temperature signal having cycles including a DEMAND state and a NO DEMAND state, each said state corresponding to a difference between the temperature of the air in the space and a set point temperature; means for changing the temperature of the air; at least one motor driving the changing means at a speed or torque defined by a motor speed/torque control signal; and a control responsive to the temperature signal and including means for sensing a DEMAND cycle time period during which the temperature signal is in the DEMAND state and for sensing a NO DEMAND cycle time period during which the temperature signal is in the NO DEMAND state, said control generating the motor speed/torque control signal as a function of both the DEMAND cycle time period and the NO DEMAND cycle time period whereby said motor speed/torque control signal is provided to the at least one motor to control the torque or speed of the at least one motor dependent upon the period of time between each successive state change.

Claim 2

Independent Claim 210 words

A system for conditioning air in a space by heating or cooling the air to change its temperature, said system comprising: a circuit, responsive to the temperature of the air in the space, for generating a two state temperature signal having cycles including a DEMAND state and a NO DEMAND state, each said state corresponding to a difference between the temperature of the air in the space and a set point temperature; means for changing the temperature of the air; at least one motor driving the changing means at a speed or torque defined by a motor speed/torque control signal; and a control responsive to the temperature signal and including means for sensing a DEMAND cycle time period during which the temperature signal is in the DEMAND state and for sensing a NO DEMAND cycle time period during which the temperature signal is in the NO DEMAND state, said control generating the motor speed/torque control signal as a function of both the DEMAND cycle time period and the NO DEMAND cycle time period whereby said motor speed/torque control signal is provided to the at least one motor to control the torque or speed of the at least one motor dependent upon the period of time between each successive state change.

Claim 3

Dependent Claim 48 words

The system of claim 1 wherein said motor has a rotatable assembly in driving relation to the changing means; said system further comprising means for sensing the position of the rotatable assembly and providing a position signal to the control, said control being responsive to the position signal.

Claim 4

Independent Claim 274 words

A system for conditioning air in a space by heating or cooling the air to change its temperature, said system comprising: a circuit, responsive to the temperature of the air in the space, for generating a two state temperature signal having a DEMAND state and a NO DEMAND state, each said state corresponding to a difference between the temperature of the air in the space and a set point temperature; means for changing the temperature of the air; a first motor driving the changing means in response to a motor control signal; and a first control responsive to the temperature signal and including means for sensing a DEMAND cycle time period during which the temperature signal is in the DEMAND state and for sensing a NO DEMAND cycle time period during which the temperature signal is in the NO DEMAND state, said control generating the motor control signal as a function of both the DEMAND cycle time period and the NO DEMAND cycle time period; means for moving the air; a second motor driving the moving means in response to a second motor control signal; and a second control responsive to the temperature signal and including means for sensing the period of time between state changes of the temperature signal, said second control being independent of said first control and generating the second motor control signal as a function of both the DEMAND cycle time period and the NO DEMAND cycle time period whereby said second motor control signal is provided to the second motor to control the second motor independently of the control of the first motor as controlled by the first control.

Claim 5

Independent Claim 274 words

A system for conditioning air in a space by heating or cooling the air to change its temperature, said system comprising: a circuit, responsive to the temperature of the air in the space, for generating a two state temperature signal having a DEMAND state and a NO DEMAND state, each said state corresponding to a difference between the temperature of the air in the space and a set point temperature; means for changing the temperature of the air; a first motor driving the changing means in response to a motor control signal; and a first control responsive to the temperature signal and including means for sensing a DEMAND cycle time period during which the temperature signal is in the DEMAND state and for sensing a NO DEMAND cycle time period during which the temperature signal is in the NO DEMAND state, said control generating the motor control signal as a function of both the DEMAND cycle time period and the NO DEMAND cycle time period; means for moving the air; a second motor driving the moving means in response to a second motor control signal; and a second control responsive to the temperature signal and including means for sensing the period of time between state changes of the temperature signal, said second control being independent of said first control and generating the second motor control signal as a function of both the DEMAND cycle time period and the NO DEMAND cycle time period whereby said second motor control signal is provided to the second motor to control the second motor independently of the control of the first motor as controlled by the first control.

Claim 6

Dependent Claim 48 words

The system of claim 1 wherein the control comprises: a memory for storing parameters representative of the system; means for selecting parameters corresponding to the system; and a microprocessor responsive to one or more shored parameters, said microprocessor generating the motor control signal responsive to the selected parameters.

Claim 7

Dependent Claim 44 words

The system of claim 4 wherein the memory comprises a programmable, nonvolatile memory for storing various parameters which correspond to various characteristics of various systems such as time constants which are a function of the thermal mass of the structure being heated and/or cooled.

Claim 8

Dependent Claim 39 words

The system of claim 4 wherein the memory comprises a memory for storing calibrating parameters representative of operation of said motor driving a predetermined load and wherein said microprocessor controls the microprocessor as a function of the calibrating parameters.

Claim 9

Dependent Claim 16 words

The system of claim 6 wherein the calibrating parameters include a current offset and a multiplier.

Claim 10

Dependent Claim 38 words

The system of claim 4 wherein the memory comprises a memory for storing calibrating parameters representative of operation of said motor driving no load and wherein said microprocessor controls the microprocessor as a function of the calibrating parameters.

Claim 11

Dependent Claim 15 words

The system of claim 8 wherein the calibrating parameters include current offset and a multiplier.

Claim 12

Dependent Claim 22 words

The system of claim 4 wherein said memory stores parameters representative of an operation of said motor in combination with the system.

Claim 13

Dependent Claim 37 words

The system of claim 10 wherein the stored parameters represent the difference between the actual torque generated by the motor and the nominal values thereby representing the combined inaccuracies of the motor in combination with the system.

Claim 14

Dependent Claim 14 words

The system of claim 10 wherein the parameters correspond to a constant CFM calibration.

Claim 15

Dependent Claim 120 words

The system of claim 4 wherein the memory comprises an EEPROM having one or more of the following parameters stored therein: speed or air flow rate for various operating modes such as a heating mode and a cooling mode; speed or air flow rates for different system capacities such as tons of cooling and kilowatts of heating; parameters defining turn-on and turn-off time delays; parameters defining motor speed or torque changes over time; parameters defining the relationship between motor torque and air flow; parameters defining the relationship between motor speed and air flow; and parameters defining direction of rotation; and wherein the motor control signal generated by the microprocessor is a function of at least one of the stored parameters.

Claim 16

Dependent Claim 15 words

The system of claim 4 wherein the memory includes a correction factor for tolerance inaccuracies.

Claim 17

Dependent Claim 49 words

The system of claim 4 wherein the memory includes a parameter stored therein which is representative of a difference between the actual current being delivered to the motor and the expected nominal current and wherein the motor control signal generated by the microprocessor is a function of the difference.

Claim 18

Dependent Claim 58 words

The system of claim 4 wherein the motor has a rotatable assembly including a rotor in driving relation to the changing means and wherein the memory includes a parameter stored therein which is representative of a magnetization level of the rotor and wherein the motor control signal generated by the microprocessor is a function of the magnetization level.

Claim 19

Dependent Claim 49 words

The system of claim 4 wherein the memory includes a parameter stored therein which is representative of a difference between the actual torque being delivered to the motor and the expected nominal torque and wherein the motor control signal generated by the microprocessor is a function of the difference.

Claim 20

Dependent Claim 47 words

The system of claim 4 wherein the memory includes a parameter stored therein which is representative of a difference between the actual speed of the motor and the expected nominal speed and wherein the motor control signal generated by the microprocessor is a function of the difference.

Claim 21

Dependent Claim 48 words

The system of claim 4 wherein the memory includes a parameter stored therein which is representative of a difference between the actual power input into the system and the expected nominal power and wherein the motor control signal generated by the microprocessor is a function of the difference.

Claim 22

Dependent Claim 92 words

The system of claim 1 wherein the control includes a microprocessor and wherein during operation the microprocessor generates a speed/torque control signal which increases motor speed/torque of a subsequent one of the cycles when the duty cycle of the temperature signal of a previous one of the cycles is above a preset maximum and the microprocessor generates a speed/torque control signal which decreases motor speed/torque of a subsequent one of the cycles when the duty cycle of the temperature signal of a previous one of the cycles is below a preset minimum.

Claim 23

Dependent Claim 77 words

The system of claim 1 wherein the temperature signal generating circuit comprises a thermostat having contacts which close to provide the temperature signal and having an anticipator which anticipates the opening of the contacts and further comprising means for adjusting a power level provided to the anticipator during a subsequent one of the cycles as a function of the period of time during which the contacts of thermostat are closed during a previous one of the cycles.

Claim 24

Dependent Claim 55 words

The system of claim 1 wherein the temperature signal generating circuit comprises a thermostat having an anticipator and further comprising means for adjusting a power level provided to the anticipator during a subsequent one of the cycles as a function of the duty cycle of the temperature signal during a previous one of the cycles.

Claim 25

Dependent Claim 38 words

The system of claim 22 wherein the adjusting means decreases the power level provided to the anticipator during the subsequent cycle in response to an increase in the duty cycle of the temperature signal during the previous cycle.

Claim 26

Dependent Claim 43 words

The system of claim 22 wherein the adjusting means decreases according to a linear algorithm the power level provided to the anticipator during the subsequent cycle in response to an increase in the duty cycle of the temperature signal during the previous cycle.

Claim 27

Dependent Claim 80 words

The system of claim 24 wherein the linear algorithm comprises: QU1=UBAS1-USLP1*RTEFF wherein QU1 defines the anticipator value for the current cycle selected as a function of the duty cycle; UBAS1 defines the baseline steady state anticipator temperature rise; USPL1 defines the slope of the linear relation between the anticipator value and the duty cycle; and RTEFF is the duty cycle modified to account for a change in the motor rpm from start of last cycle to start of current cycle.

Claim 28

Dependent Claim 60 words

The system of claim 24 wherein the linear algorithm comprises: QU1=UBAS1-USLP1*RTIME wherein QU1 defines the anticipator value for the current cycle selected as a function of the duty cycle; UBAS1 defines the baseline steady state anticipator temperature rise; USPL1 defines the slope of the linear relation between the anticipator value and the duty cycle; and RTIME is the duty cycle.

Claim 29

Independent Claim 148 words

A system for conditioning air in a space by heating or cooling the air to change its temperature, said system comprising: a thermostat, responsive to the temperature of the air in the space, for generating a two state temperature signal having a DEMAND state and a NO DEMAND state; a compressor for changing the temperature of the air; a motor driving the compressor at a speed or torque defined by a motor speed/torque control signal; a control responsive to the temperature signal and including means for sensing a DEMAND cycle time period during which the temperature signal is in the DEMAND state, said control generating the motor speed/torque control signal as a function of the DEMAND cycle time period whereby said motor speed/torque control signal is provided to the motor to control the torque or speed of the motor as a function of the DEMAND cycle time period.

Claim 30

Independent Claim 148 words

A system for conditioning air in a space by heating or cooling the air to change its temperature, said system comprising: a thermostat, responsive to the temperature of the air in the space, for generating a two state temperature signal having a DEMAND state and a NO DEMAND state; a compressor for changing the temperature of the air; a motor driving the compressor at a speed or torque defined by a motor speed/torque control signal; a control responsive to the temperature signal and including means for sensing a DEMAND cycle time period during which the temperature signal is in the DEMAND state, said control generating the motor speed/torque control signal as a function of the DEMAND cycle time period whereby said motor speed/torque control signal is provided to the motor to control the torque or speed of the motor as a function of the DEMAND cycle time period.

Claim 31

Dependent Claim 48 words

The system of claim 27 wherein the control comprises: a memory for storing calibrating parameters representative of operation of said motor driving a predetermined load; means, responsive to the calibrating parameters and to the temperature signal, for generating the motor control signal to control motor speed or torque.

Claim 32

Dependent Claim 17 words

The system of claim 28 wherein the calibrating parameters represent operation of the motor driving no load.

Claim 33

Dependent Claim 16 words

The system of claim 28 wherein the calibrating parameters include a current offset and a multiplier.

Claim 34

Dependent Claim 32 words

The system of claim 27 wherein the compressor has a predefined operating speed range and wherein said control initially operates the motor to drive the compressor at the midpoint of the range.

Claim 35

Dependent Claim 49 words

The system of claim 27 wherein the compressor has a predefined operating speed range and wherein said control operates the motor to drive the compressor at a speed within the range which speed is increasing at a fixed rate during the period that the thermostat indicates the DEMAND state.

Claim 36

Dependent Claim 44 words

The system of claim 32 wherein said control operates the motor to drive the compressor at a speed within the range which speed is decreasing at a rate greater than the fixed rate during the period that the thermostat indicates the NO DEMAND state.

Claim 37

Independent Claim 170 words

A method for conditioning air in a space by heating or cooling the air to change its temperature, said method comprising: generating in response to the temperature of the air in the space a two state temperature signal having cycles including a DEMAND state and a NO DEMAND state, each state corresponding to a difference between the temperature of the air in the space and a set point temperature; changing the temperature of the air by controlling a motor driving temperature changing means, said motor being controlled in response to a speed/torque control signal; sensing a DEMAND cycle time period during which the temperature signal is in the DEMAND state; sensing a NO DEMAND cycle time period during which the temperature signal is in the NO DEMAND state; and generating the speed/torque control signal as a function of both the DEMAND cycle time period and the NO DEMAND cycle time period whereby the speed/torque of the motor is controlled depending upon the period of time between each successive state change.

Claim 38

Independent Claim 170 words

A method for conditioning air in a space by heating or cooling the air to change its temperature, said method comprising: generating in response to the temperature of the air in the space a two state temperature signal having cycles including a DEMAND state and a NO DEMAND state, each state corresponding to a difference between the temperature of the air in the space and a set point temperature; changing the temperature of the air by controlling a motor driving temperature changing means, said motor being controlled in response to a speed/torque control signal; sensing a DEMAND cycle time period during which the temperature signal is in the DEMAND state; sensing a NO DEMAND cycle time period during which the temperature signal is in the NO DEMAND state; and generating the speed/torque control signal as a function of both the DEMAND cycle time period and the NO DEMAND cycle time period whereby the speed/torque of the motor is controlled depending upon the period of time between each successive state change.

Claim 39

Independent Claim 182 words

A method for conditioning air in a space by heating or cooling the air to change its temperature, said method comprising: generating in response to the temperature of the air in the space a two state temperature signal having cycles including a DEMAND state and a NO DEMAND state, each said state corresponding to a difference between the temperature of the air in the space and a set point temperature; changing the temperature of the air in response to a first control signal; sensing a DEMAND cycle time period during which the temperature signal is in the DEMAND state; sensing a NO DEMAND cycle time period during which the temperature signal is in the NO DEMAND state; and generating the first control signal as a function of both the DEMAND cycle time period and the NO DEMAND cycle time period; moving the air in response to a second control signal; and generating the second control signal independent of the first control signal generating step and as a function of both the DEMAND cycle time period and the NO DEMAND cycle time period.

Claim 40

Independent Claim 182 words

A method for conditioning air in a space by heating or cooling the air to change its temperature, said method comprising: generating in response to the temperature of the air in the space a two state temperature signal having cycles including a DEMAND state and a NO DEMAND state, each said state corresponding to a difference between the temperature of the air in the space and a set point temperature; changing the temperature of the air in response to a first control signal; sensing a DEMAND cycle time period during which the temperature signal is in the DEMAND state; sensing a NO DEMAND cycle time period during which the temperature signal is in the NO DEMAND state; and generating the first control signal as a function of both the DEMAND cycle time period and the NO DEMAND cycle time period; moving the air in response to a second control signal; and generating the second control signal independent of the first control signal generating step and as a function of both the DEMAND cycle time period and the NO DEMAND cycle time period.

Claim 41

Dependent Claim 38 words

The method of claim 34 further comprising providing a memory storing time constants which are a function of the thermal mass of the structure being heated and/or cooled and generating said control signals based on said time constants.

Claim 42

Dependent Claim 33 words

The method of claim 36 further comprising providing a nonvolatile memory for storing various time constants which correspond to various parameters of various systems and selecting a time constant corresponding to the system.

Claim 43

Dependent Claim 68 words

The method of claim 34 further comprising increasing motor speed/torque of a subsequent one of the cycles when the duty cycle of the temperature signal of a previous one of the cycles is above a preset maximum and decreasing motor speed/torque of a subsequent one of the cycles when the duty cycle of the temperature signal of a previous one of the cycles is below a preset minimum.

Claim 44

Dependent Claim 70 words

The method of claim 34 further comprising providing a thermostat having contacts which close to provide the temperature signal and having an anticipator which anticipates the opening of the contacts and adjusting a power level provided to the anticipator during a subsequent one of the cycles as a function of the period of time during which the contacts of the thermostat are closed during a previous one of the cycles.

Claim 45

Dependent Claim 47 words

The method of claim 34 further comprising providing a thermostat having an anticipator and adjusting a power level provided to the anticipator during a subsequent one of the cycles as a function of the duty cycle of the temperature signal during a previous one of the cycles.

Claim 46

Dependent Claim 36 words

The method of claim 40 further comprising decreasing the power level provided to the anticipator during the subsequent cycle in response to an increase in the duty cycle of the temperature signal during the previous cycle.

Claim 47

Dependent Claim 41 words

The method of claim 40 further comprising decreasing according to a linear algorithm the power level provided to the anticipator during the subsequent cycle in response to an increase in the duty cycle of the temperature signal during the previous cycle.

Claim 48

Dependent Claim 44 words

The method of claim 34 further comprising: storing calibrating parameters representative of operation of said motor driving a predetermined load; and generating the control signal to control motor speed or torque in response to the calibrating parameters and in response to the temperature signal.

Claim 49

Independent Claim 127 words

A method for conditioning air in a space by heating or cooling the air to change its temperature, said method comprising: generating a two state temperature signal in response to the temperature of the air in the space, the temperature signal having a DEMAND state and having a NO DEMAND state; changing the temperature of the air by controlling a motor driving temperature changing means, said motor being controlled in response to a speed/torque control signal; sensing a DEMAND cycle time period during which the temperature signal is in the DEMAND state; and generating the speed/torque control signal as a function of the DEMAND cycle time period whereby the speed/torque control signal controls the speed/torque of the motor as a function of the DEMAND cycle time period.

Claim 50

Independent Claim 127 words

A method for conditioning air in a space by heating or cooling the air to change its temperature, said method comprising: generating a two state temperature signal in response to the temperature of the air in the space, the temperature signal having a DEMAND state and having a NO DEMAND state; changing the temperature of the air by controlling a motor driving temperature changing means, said motor being controlled in response to a speed/torque control signal; sensing a DEMAND cycle time period during which the temperature signal is in the DEMAND state; and generating the speed/torque control signal as a function of the DEMAND cycle time period whereby the speed/torque control signal controls the speed/torque of the motor as a function of the DEMAND cycle time period.

Claim 51

Dependent Claim 64 words

The method of claim 44 further comprising: providing a thermostat to generate a two state temperature signal having a first state when the air in the space is above the set point temperature and having a second state when the air in the space is below the set point temperature; providing a compressor for cooling the air; and driving the compressor with the motor.

Claim 52

Dependent Claim 31 words

The method of claim 45 further comprising providing a predefined operating speed range to the compressor and initially operating the motor to drive the compressor at the midpoint of the range.

Claim 53

Dependent Claim 48 words

The method of claim 45 further comprising providing a predefined operating speed range for the compressor and operating the motor to drive the compressor at a speed with the range which speed is increasing at a fixed rate during the period that the thermostat indicates the DEMAND state.

Claim 54

Dependent Claim 43 words

The method of claim 47 further comprising operating the motor to drive the compressor at a speed within the range which speed is decreasing at a rate greater than the fixed rate during the period that the thermostat indicates the NO DEMAND state.

Claim 55

Dependent Claim 47 words

The method of claim 44 further comprising: storing calibrating parameters representative of operation of said motor driving a predetermined load; and generating the control signal to control motor speed or torque in response to the calibrating parameters and in response to the sensed period between state changes.

Claim 56

Dependent Claim 122 words

In a system providing cycles of an on/off signal, an apparatus comprising: a motor operating at a speed or torque defined by a motor speed/torque control signal; and a control responsive to the on/off signal and including means for sensing a DEMAND period of time between state changes of the on/off signal and for sensing a NO DEMAND period of time between changes of the on/off signal, said control generating the motor speed/torque control signal as a function of both the DEMAND and NO DEMAND periods between state changes whereby said motor speed/torque control signal is provided to the motor to control the torque or speed of the motor dependent upon the DEMAND and NO DEMAND periods between each successive state change.

Claim 57

Dependent Claim 122 words

In a system providing cycles of an on/off signal, an apparatus comprising: a motor operating at a speed or torque defined by a motor speed/torque control signal; and a control responsive to the on/off signal and including means for sensing a DEMAND period of time between state changes of the on/off signal and for sensing a NO DEMAND period of time between changes of the on/off signal, said control generating the motor speed/torque control signal as a function of both the DEMAND and NO DEMAND periods between state changes whereby said motor speed/torque control signal is provided to the motor to control the torque or speed of the motor dependent upon the DEMAND and NO DEMAND periods between each successive state change.

Claim 58

Dependent Claim 80 words

The apparatus of claim 50 wherein the control includes a microprocessor and wherein during operation the microprocessor increases motor speed/torque of a subsequent one of the cycles when the duty cycle of the on/off signal of a previous one of the cycles is above a preset maximum and the microprocessor decreases motor speed/torque of a subsequent one of the cycles when the duty cycle of the on/off signal of a previous one of the cycles is below a preset minimum.

Claim 59

Dependent Claim 80 words

The apparatus of claim 50 wherein the system includes a mechanism having contacts which close to provide the cycles of the on/off signal and includes an anticipator which anticipates the opening of the contacts of subsequent cycles of the on/off signals said apparatus further comprising means for adjusting a power level provided to the anticipator during a subsequent one of the cycles as a function of the duty cycle of the on/off signal during a previous one of the cycles.

Claim 60

Dependent Claim 38 words

The apparatus of claim 52 wherein the adjusting means decreases the power level provided to the anticipator during the subsequent cycle in response to an increase in the duty cycle of the on/off signal during the previous cycle.

Claim 61

Dependent Claim 43 words

The apparatus of claim 52 wherein the adjusting means decreases according to a linear algorithm the power level provided to the anticipator during the subsequent cycle in response to an increase in the duty cycle of the on/off signal during the previous cycle.

Claim 62

Dependent Claim 48 words

The apparatus of claim 50 wherein the control comprises: a memory for storing calibrating parameters representative of operation of said motor driving a predetermined load; means, responsive to the calibrating parameters and to the on/off signal, for generating said motor control signal to control motor speed or torque.

Claim 63

Dependent Claim 17 words

The apparatus of claim 55 wherein the calibrating parameters represent operation of the motor driving no load.

Claim 64

Dependent Claim 16 words

The apparatus of claim 55 wherein the calibrating parameters include a current offset and a multiplier.

Claim 65

Dependent Claim 92 words

In a method using cycles of an on/off signal and using at least one motor in response to a motor speed/torque control signal; said method comprising: sensing a DEMAND period of time between state changes of the on/off signal; sensing a NO DEMAND period of time between state changes of the on/off signal; generating the motor speed/torque control signal as a function of both the DEMAND and NO DEMAND periods between state changes whereby the speed/torque of the motor depends upon the DEMAND and NO DEMAND periods between each successive state change.

Claim 66

Dependent Claim 92 words

In a method using cycles of an on/off signal and using at least one motor in response to a motor speed/torque control signal; said method comprising: sensing a DEMAND period of time between state changes of the on/off signal; sensing a NO DEMAND period of time between state changes of the on/off signal; generating the motor speed/torque control signal as a function of both the DEMAND and NO DEMAND periods between state changes whereby the speed/torque of the motor depends upon the DEMAND and NO DEMAND periods between each successive state change.

Claim 67

Dependent Claim 72 words

The method of claim 58 further comprising increasing speed/torque of the motor during a subsequent one of the cycles when the duty cycle of the on/off signal of a previous one of the cycles is above a preset maximum and decreasing speed/torque of the motor during a subsequent one of the cycles when the duty cycle of the on/off signal of a previous one of the signals is below a preset minimum.

Claim 68

Dependent Claim 81 words

The method of claim 58 wherein the method uses a mechanism having contacts which close to provide the cycles of the on/off signal and wherein the method uses an anticipator which anticipates the opening of the contacts of subsequent cycles of the on/off signal, said method further comprising adjusting a power level provided to the anticipator during a subsequent one of the cycles as a function of the duty cycle of the on/off signal during a previous one of the cycles.

Claim 69

Dependent Claim 36 words

The method of claim 60 further comprising decreasing the power level provided to the anticipator during the subsequent cycle in response to an increase in the duty cycle of the on/off signal during a previous cycle.

Claim 70

Dependent Claim 41 words

The method of claim 60 further comprising decreasing according to a linear algorithm the power level provided to the anticipator during the subsequent cycle in response to an increase in the duty cycle of the on/off signal during a previous cycle.

Claim 71

Dependent Claim 45 words

The method of claim 58 further comprising: storing calibrating parameters representative of operation of said motor driving a predetermined load; and generating the motor control signal to control motor speed or torque in response to the calibrating parameters and in response to the on/off signal.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1998-04-24	1998-10-24	1999-04-25	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2002-04-24	2002-10-24	2003-04-25	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2006-04-24	2006-10-24	2007-04-25	$7700.00	Window Closed / Lapsed

Variable speed HVAC without controller and responsive to a conventional thermostat

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