Variable speed HVAC without controller and responsive to a conventional thermostat

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.

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.

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.

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.

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.

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.