Air conditioning control system with master and tracking controllers
First Claim
1. In an air conditioning system having at least two duct sections each with an associated damper for regulating air flow therethrough;
- the combination comprising at least one master controller and an operatively associated first actuator for one damper and at least one tracking controller and an operatively associated second actuator for the other damper, said master controller comprising a first flow sensor producing a first flow variable signal in response to sensed flow in the duct section associated with said one damper, adjustable reference signal means, first means for comparing said flow variable and reference signals and for transmitting a first resultant signal to said first actuator for operation thereof and for corresponding movement of said one damper in response thereto, and said tracking controller comprising a second flow sensor producing a second flow variable signal in response to sensed flow in the duct section associated with the other damper, and second signal comparison and transmitting means for comparing said first and second flow variable signals and for transmitting a second resultant signal to said second actuator for operation thereof and for corresponding movement of said other damper in response thereto.
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Accused Products
Abstract
An air conditioning control system for at least two duct sections each with an associated damper comprises at least one master controller for a first pneumatic actuator for one damper and at least one tracking controller for a second pneumatic actuator for the other damper. The master controller comprises a first flow sensor producing a first flow variable signal in response to a sensed flow in the duct section associated with the said one damper. An adjustable reference or bias signal means is provided and a temperature signal is combined therewith to provide a composite signal for comparison with the flow variable signal. A resultant signal after comparison operates the first pneumatic actuator for the said one damper. A tracking controller comprises a second flow sensor producing a second flow variable signal in response to sensed flow in the duct section associated with the other damper. A second signal comparison and transmitting means receives the first and second flow variable signals, compares the two and transmits a second resultant signal to the second pneumatic actuator for control of the said other damper. The second comparison means includes a pivotally mounted lever acted upon by diaphragm actuated first and second push rods representing the first and second flow variable signals. One of the diaphragm assemblies is mounted for slidable adjustment along the lever to vary the relative mechanical advantage and to vary the flow ratio between the two dampers and duct sections.
13 Citations
8 Claims
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1. In an air conditioning system having at least two duct sections each with an associated damper for regulating air flow therethrough;
- the combination comprising at least one master controller and an operatively associated first actuator for one damper and at least one tracking controller and an operatively associated second actuator for the other damper, said master controller comprising a first flow sensor producing a first flow variable signal in response to sensed flow in the duct section associated with said one damper, adjustable reference signal means, first means for comparing said flow variable and reference signals and for transmitting a first resultant signal to said first actuator for operation thereof and for corresponding movement of said one damper in response thereto, and said tracking controller comprising a second flow sensor producing a second flow variable signal in response to sensed flow in the duct section associated with the other damper, and second signal comparison and transmitting means for comparing said first and second flow variable signals and for transmitting a second resultant signal to said second actuator for operation thereof and for corresponding movement of said other damper in response thereto.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
Specification