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公开(公告)号：US11604002B2
公开(公告)日：2023-03-14
申请号：US16139882
申请日：2018-09-24
发明人： Nathan M. Zimmerman , Michael J. Ajax , Nicholas S. Van Derven , John M. House , Timothy I. Salsbury
IPC分类号： F24F11/70 , G05D23/19 , F24F110/12 , F24F11/30 , F24F11/62 , F24F11/89 , F24F120/20
摘要： A thermostat is disclosed. The thermostat can include one or more temperature sensors configured to measure one or more temperature values. The thermostat can include a processing circuit. The processing circuit can receive the one or more temperature values from the one or more temperature sensors. The processing circuit can receive one or more central processing unit (CPU) usage values, wherein the one or more CPU usage values indicate computing usage of the processing circuit. The processing circuit can determine, based on an empirical model comprising one or more gain values and one or more filters and based on one or more signals, a temperature of the building. The one or more signals comprise the one or more temperature values and the one or more CPU usage values. The empirical model accounts for dynamics of heat generated by the processing circuit and airflow acting on the thermostat.
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公开(公告)号：US11163278B2
公开(公告)日：2021-11-02
申请号：US16198539
申请日：2018-11-21
IPC分类号： G05B19/042
摘要： An on-off control system includes on-off equipment configured to operate in either an on state or an off state, an on-off controller configured to cause the equipment to transition between the on state and the off state based on a setpoint value and a deadband value to drive a control variable toward the setpoint value, and a deadband controller, according to some embodiments. In some embodiments, the deadband controller is configured to generate the deadband value used by the on-off controller. In some embodiments, the deadband controller is configured to generate the deadband value by obtaining a cost function that defines a cost based on at least a set of control values and the deadband value and selecting the deadband value that results in an optimal value of the cost function over a range of possible deadband values, the selected deadband value defining an optimal deadband value.
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公开(公告)号：US20210215378A1
公开(公告)日：2021-07-15
申请号：US16739986
申请日：2020-01-10
IPC分类号： F24F11/77 , G05B13/02 , F24F110/40
摘要： An extremum seeking controller includes a processing circuit configured to modulate a manipulated variable provided as an input to a plant using an extremum-seeking control technique to drive a gradient of an objective function with respect to the manipulated variable toward an extremum. The objective function includes a performance variable characterizing a performance of the plant responsive to the manipulated variable. The objective function also includes a saturation adjustment term that becomes active as the plant approaches a saturation point and remains active as the plant operates within a saturated region past the saturation point. The saturation adjustment term causes the processing circuit to adjust the manipulated variable toward a value of the manipulated variable that returns the plant from the saturated region to a non-saturated region.
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公开(公告)号：US20200333751A1
公开(公告)日：2020-10-22
申请号：US16913328
申请日：2020-06-26
发明人： Timothy I. Salsbury , John M. House
IPC分类号： G05B13/02
摘要： A self-configuring controller includes one or more processors and one or more non-transitory machine readable media storing instructions. When executed by the one or more processors, the instructions cause the one or more processors to receive an output signal from a controlled system or device representative of an operation of the controlled system or device in response to a first perturbed control input perturbed using a first dither signal, estimate a bandwidth of the controlled system or device based on the output signal and the first dither signal, perturb a second control input using a second dither signal based on the bandwidth of the controlled system or device to generate a second perturbed control input, and transmit the second perturbed control input to the controlled system or device.
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公开(公告)号：US20190041077A1
公开(公告)日：2019-02-07
申请号：US16052120
申请日：2018-08-01
发明人： Timothy I. Salsbury , John M. House
摘要： A cooperative extremum-seeking control system includes a first controller and a second controller. The first controller is configured to provide a first control input to a first plant and receive a first performance variable as feedback from the first plant. The second controller is configured to provide a second control input to a second plant that interacts with the first plant, receive a second performance variable as feedback from the second plant, and provide the second performance variable to the first controller. The first controller is further configured to aggregate the first performance variable and the second performance variable to determine a total performance variable, calculate a gradient of the total performance variable with respect to the first control input, generate a third control input using the gradient of the total performance variable, and provide the third control input to the first plant.
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公开(公告)号：US20180299839A1
公开(公告)日：2018-10-18
申请号：US15950009
申请日：2018-04-10
发明人： Timothy I. Salsbury , John M. House
IPC分类号： G05B13/02
摘要： An extremum-seeking control system includes a plant operable to affect a variable state or condition of a building and an extremum-seeking controller. The extremum-seeking controller is configured to provide a control input to a plant and receive a performance variable as a first feedback from the plant. The plant uses the control input to affect the performance variable. The extremum-seeking controller is configured to receive a constrained variable as a second feedback from the plant and calculate a performance penalty by applying a penalty function to the constrained variable. The extremum-seeking controller is further configured to modify the performance variable with the performance penalty to generate a modified cost function, estimate a gradient of the modified cost function with respect to the control input, and drive the gradient of the modified cost function toward zero by modulating the control input.
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公开(公告)号：US20170241658A1
公开(公告)日：2017-08-24
申请号：US15080435
申请日：2016-03-24
发明人： Timothy I. Salsbury , John M. House
IPC分类号： F24F11/00 , G05B19/406 , G05B13/04 , F24F5/00
CPC分类号： F24F5/0035 , F24F11/30 , F24F11/54 , F24F11/62 , F24F11/63 , F24F11/77 , F24F11/83 , F24F11/85 , F24F2140/60
摘要： An extremum-seeking control system for a chilled water plant includes a feedback controller and an extremum-seeking controller. The feedback controller is configured to operate equipment of the chilled water plant to achieve a condenser water temperature setpoint. The equipment include at least one of a chiller compressor, a condenser water pump, and a cooling tower fan. The extremum-seeking controller is configured to provide the condenser water temperature setpoint to the feedback controller. The extremum-seeking controller is configured to determine an optimal value for the setpoint condenser water temperature setpoint by perturbing the condenser water temperature setpoint with a stochastic excitation signal, monitoring a power consumption of the equipment resulting from the perturbed condenser water temperature setpoint, estimating a gradient of the power consumption with respect to the condenser water temperature setpoint, and modulating the condenser water temperature setpoint to drive the estimated gradient to zero.
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公开(公告)号：US11519631B2
公开(公告)日：2022-12-06
申请号：US16740031
申请日：2020-01-10
摘要： An adaptive flow limit controller for controlling a flow rate of a fluid through a heat exchanger includes a processing circuit. The processing circuit is configured to use an adaptive model to determine a threshold flow rate of the fluid through the heat exchanger at which a gradient of a temperature difference of the fluid across the heat exchanger with respect to the flow rate of the fluid through the heat exchanger has a threshold gradient value. The processing circuit is configured to operate a flow control device to maintain the flow rate of the fluid of through the heat exchanger at less than or equal to the threshold flow rate.
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公开(公告)号：US11199336B2
公开(公告)日：2021-12-14
申请号：US16523913
申请日：2019-07-26
摘要： A controller for HVAC equipment of a plant includes a processing circuit configured to predict an impact of a time delay of the plant on a performance variable received as feedback from the plant. The processing circuit is configured to artificially increase or decrease a value of the performance variable using an adjustable time delay parameter to at least partially negate the impact of the time delay on the performance variable. The processing circuit is configured to use the artificially increased or decreased value of the performance variable in on-off feedback control to operate the HVAC equipment.
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公开(公告)号：US11137160B2
公开(公告)日：2021-10-05
申请号：US16531892
申请日：2019-08-05
发明人： Timothy I. Salsbury , John M. House
IPC分类号： F24F11/46 , F24F11/523 , F24F11/62 , F24F11/65 , G05B13/04
摘要： A space controller and method for determining energy savings of the space controller are provided. The method includes estimating, by one or more processing circuits, a steady state gain of a controlled variable of a heating, ventilation, and air conditioning (HVAC) system; determining, by the one or more processing circuits, an actual runtime that HVAC equipment of the HVAC system is in an on state based on a first setpoint or schedule; predicting, by the one or more processing circuits, a reduction of runtime that the HVAC equipment is in the on state for a second setpoint or schedule based on the actual runtime and the steady state gain; and adjusting, by the one or more processing circuits, the first setpoint or schedule to the second setpoint or schedule based on the reduction of runtime.
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