| Patent application number | Description | Published |
|---|
| 20080277486 | HVAC control system and method - An HVAC control system configured to control the environment of a building zone includes a means for determining a number of people occupying the building zone and a means for determining properties of other heat transferring objects located within the building zone. The HVAC control system may also include a controller, the controller being configured to compute a projected heat gain in a building zone based on the determined number of people occupying the building zone and the determined properties of the other heat transferring objects located within the building zone. The controller may use the computed projected heat gain to determine a zone ventilation setpoint for the building zone. | 11-13-2008 |
| 20090065596 | SYSTEMS AND METHODS FOR INCREASING BUILDING SPACE COMFORT USING WIRELESS DEVICES - A method for providing control to a building zone uses a building automation system and a portable wireless device located within the building zone. The method includes the step of identifying the portable wireless device using wireless communications. The method further includes retrieving information from a memory device specific to the identified portable wireless device. The retrieved information comprises a user preference relating to the building automation system. The method further includes adjusting a parameter of the building automation system based on the retrieved information. | 03-12-2009 |
| 20090083583 | FAULT DETECTION SYSTEMS AND METHODS FOR SELF-OPTIMIZING HEATING, VENTILATION, AND AIR CONDITIONING CONTROLS - A fault detection system for detecting a fault in a process system includes a first circuit configured to modify an input of the process system with a modifying signal. The fault detection system further includes a second circuit configured to receive an output from the process system and configured to determine whether the fault exists based on at least one of a reduction of a signal component and an unexpected transformation of the signal component, wherein the signal component corresponds to a function of the modifying signal. | 03-26-2009 |
| 20090144023 | METHOD AND SYSTEM FOR ASSESSING PERFORMANCE OF CONTROL SYSTEMS - A system is disclosed for scaling performance indicators of control applications in an environmental control system. The system is configured to identify a probability distribution that is characteristic of a fault-free environmental control system and to use the probability distribution of a fault-free environmental control system in calculations to display probability distributions of data from first and second control applications on a common scale. | 06-04-2009 |
| 20100106328 | EXTREMUM SEEKING CONTROL WITH RESET CONTROL - An extremum seeking control method optimizes a control process for a plant such as an air handling unit. The method compensates for abrupt changes in the operation of the plant by resetting the extremum seeking control strategy in response to a detection of the abrupt change. | 04-29-2010 |
| 20100106331 | EXTREMUM SEEKING CONTROL WITH ACTUATOR SATURATION CONTROL - An extremum seeking control method optimizes a control process for a plant such as an air handling unit. The method improves the performance of an extremum seeking control strategy by limiting, removing or preventing the effects of an actuator saturation condition, particularly as the extremum seeking control strategy relates to HVAC applications. | 04-29-2010 |
| 20100324741 | SYSTEMS AND METHODS FOR FAULT DETECTION OF AIR HANDLING UNITS - A system is disclosed for detecting faults in an environmental control system for a building zone. The environmental control system is controlled by a finite state machine that causes states of the environmental control system to change based on a varying climate condition. A circuit is configured to receive a current value for the climate condition when the environmental control system is in a heating state and to calculate an estimate of the climate condition at which a transition from the heating state to a state of no heating by the environmental control system is expected to be caused by the finite state machine. The circuit is configured to determine that a fault exists based on a comparison of the current value for the climate condition in the heating state and the estimate of the climate condition at which a transition from the heating state to the no heating state is expected to be caused by the finite state machine. | 12-23-2010 |
| 20110029100 | SYSTEMS AND METHODS FOR IMPROVED START-UP IN FEEDBACK CONTROLLERS - A system for controlling start-up of a feedback controller includes a memory device and a processing circuit. The processing circuit is configured to receive a gain parameter from the feedback controller and to store the gain parameter in the memory device. The processing circuit is further configured to multiply the stored gain parameter and to cause the feedback controller to use the multiplied gain parameter in response to a determination that the feedback controller has restarted. | 02-03-2011 |
| 20110056224 | SENSOR-FREE OPTIMAL CONTROL OF AIR-SIDE ECONOMIZER - Systems and methods for regulating the amount of outdoor air that is introduced into a building are shown and described. These systems and methods utilize extremum seeking control logic to vary the flow of outdoor air into the building in response to cooling load determinations. | 03-10-2011 |
